1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 #include "nsCSSRenderingBorders.h"
8
9 #include "gfxUtils.h"
10 #include "mozilla/ArrayUtils.h"
11 #include "mozilla/gfx/2D.h"
12 #include "mozilla/gfx/Helpers.h"
13 #include "mozilla/gfx/PathHelpers.h"
14 #include "BorderConsts.h"
15 #include "DashedCornerFinder.h"
16 #include "DottedCornerFinder.h"
17 #include "ImageRegion.h"
18 #include "nsLayoutUtils.h"
19 #include "nsStyleConsts.h"
20 #include "nsContentUtils.h"
21 #include "nsCSSColorUtils.h"
22 #include "nsCSSRendering.h"
23 #include "nsCSSRenderingGradients.h"
24 #include "nsDisplayList.h"
25 #include "nsExpirationTracker.h"
26 #include "nsIScriptError.h"
27 #include "nsClassHashtable.h"
28 #include "nsPresContext.h"
29 #include "nsStyleStruct.h"
30 #include "gfx2DGlue.h"
31 #include "gfxGradientCache.h"
32 #include "mozilla/image/WebRenderImageProvider.h"
33 #include "mozilla/layers/StackingContextHelper.h"
34 #include "mozilla/layers/RenderRootStateManager.h"
35 #include "mozilla/layers/WebRenderLayerManager.h"
36 #include "mozilla/ProfilerLabels.h"
37 #include "mozilla/Range.h"
38 #include <algorithm>
39
40 using namespace mozilla;
41 using namespace mozilla::gfx;
42 using namespace mozilla::image;
43
44 #define MAX_COMPOSITE_BORDER_WIDTH LayoutDeviceIntCoord(10000)
45
46 /**
47 * nsCSSRendering::PaintBorder
48 * nsCSSRendering::PaintOutline
49 * -> DrawBorders
50 *
51 * DrawBorders
52 * -> Ability to use specialized approach?
53 * |- Draw using specialized function
54 * |- separate corners?
55 * |- dashed side mask
56 * |
57 * -> can border be drawn in 1 pass? (e.g., solid border same color all
58 * around)
59 * |- DrawBorderSides with all 4 sides
60 * -> more than 1 pass?
61 * |- for each corner
62 * |- clip to DoCornerClipSubPath
63 * |- for each side adjacent to corner
64 * |- clip to GetSideClipSubPath
65 * |- DrawBorderSides with one side
66 * |- for each side
67 * |- GetSideClipWithoutCornersRect
68 * |- DrawDashedOrDottedSide || DrawBorderSides with one side
69 */
70
71 static void ComputeBorderCornerDimensions(const Float* aBorderWidths,
72 const RectCornerRadii& aRadii,
73 RectCornerRadii* aDimsResult);
74
75 // given a side index, get the previous and next side index
76 #define NEXT_SIDE(_s) mozilla::Side(((_s) + 1) & 3)
77 #define PREV_SIDE(_s) mozilla::Side(((_s) + 3) & 3)
78
79 // given a corner index, get the previous and next corner index
80 #define NEXT_CORNER(_s) Corner(((_s) + 1) & 3)
81 #define PREV_CORNER(_s) Corner(((_s) + 3) & 3)
82
83 // from the given base color and the background color, turn
84 // color into a color for the given border pattern style
85 static sRGBColor MakeBorderColor(nscolor aColor,
86 BorderColorStyle aBorderColorStyle);
87
88 // Given a line index (an index starting from the outside of the
89 // border going inwards) and an array of line styles, calculate the
90 // color that that stripe of the border should be rendered in.
91 static sRGBColor ComputeColorForLine(uint32_t aLineIndex,
92 const BorderColorStyle* aBorderColorStyle,
93 uint32_t aBorderColorStyleCount,
94 nscolor aBorderColor);
95
96 // little helper function to check if the array of 4 floats given are
97 // equal to the given value
CheckFourFloatsEqual(const Float * vals,Float k)98 static bool CheckFourFloatsEqual(const Float* vals, Float k) {
99 return (vals[0] == k && vals[1] == k && vals[2] == k && vals[3] == k);
100 }
101
IsZeroSize(const Size & sz)102 static bool IsZeroSize(const Size& sz) {
103 return sz.width == 0.0 || sz.height == 0.0;
104 }
105
106 /* static */
AllCornersZeroSize(const RectCornerRadii & corners)107 bool nsCSSBorderRenderer::AllCornersZeroSize(const RectCornerRadii& corners) {
108 return IsZeroSize(corners[eCornerTopLeft]) &&
109 IsZeroSize(corners[eCornerTopRight]) &&
110 IsZeroSize(corners[eCornerBottomRight]) &&
111 IsZeroSize(corners[eCornerBottomLeft]);
112 }
113
GetHorizontalSide(Corner aCorner)114 static mozilla::Side GetHorizontalSide(Corner aCorner) {
115 return (aCorner == C_TL || aCorner == C_TR) ? eSideTop : eSideBottom;
116 }
117
GetVerticalSide(Corner aCorner)118 static mozilla::Side GetVerticalSide(Corner aCorner) {
119 return (aCorner == C_TL || aCorner == C_BL) ? eSideLeft : eSideRight;
120 }
121
GetCWCorner(mozilla::Side aSide)122 static Corner GetCWCorner(mozilla::Side aSide) {
123 return Corner(NEXT_SIDE(aSide));
124 }
125
GetCCWCorner(mozilla::Side aSide)126 static Corner GetCCWCorner(mozilla::Side aSide) { return Corner(aSide); }
127
IsSingleSide(mozilla::SideBits aSides)128 static bool IsSingleSide(mozilla::SideBits aSides) {
129 return aSides == SideBits::eTop || aSides == SideBits::eRight ||
130 aSides == SideBits::eBottom || aSides == SideBits::eLeft;
131 }
132
IsHorizontalSide(mozilla::Side aSide)133 static bool IsHorizontalSide(mozilla::Side aSide) {
134 return aSide == eSideTop || aSide == eSideBottom;
135 }
136
137 typedef enum {
138 // Normal solid square corner. Will be rectangular, the size of the
139 // adjacent sides. If the corner has a border radius, the corner
140 // will always be solid, since we don't do dotted/dashed etc.
141 CORNER_NORMAL,
142
143 // Paint the corner in whatever style is not dotted/dashed of the
144 // adjacent corners.
145 CORNER_SOLID,
146
147 // Paint the corner as a dot, the size of the bigger of the adjacent
148 // sides.
149 CORNER_DOT
150 } CornerStyle;
151
nsCSSBorderRenderer(nsPresContext * aPresContext,DrawTarget * aDrawTarget,const Rect & aDirtyRect,Rect & aOuterRect,const StyleBorderStyle * aBorderStyles,const Float * aBorderWidths,RectCornerRadii & aBorderRadii,const nscolor * aBorderColors,bool aBackfaceIsVisible,const Maybe<Rect> & aClipRect)152 nsCSSBorderRenderer::nsCSSBorderRenderer(
153 nsPresContext* aPresContext, DrawTarget* aDrawTarget,
154 const Rect& aDirtyRect, Rect& aOuterRect,
155 const StyleBorderStyle* aBorderStyles, const Float* aBorderWidths,
156 RectCornerRadii& aBorderRadii, const nscolor* aBorderColors,
157 bool aBackfaceIsVisible, const Maybe<Rect>& aClipRect)
158 : mPresContext(aPresContext),
159 mDrawTarget(aDrawTarget),
160 mDirtyRect(aDirtyRect),
161 mOuterRect(aOuterRect),
162 mBorderRadii(aBorderRadii),
163 mBackfaceIsVisible(aBackfaceIsVisible),
164 mLocalClip(aClipRect) {
165 PodCopy(mBorderStyles, aBorderStyles, 4);
166 PodCopy(mBorderWidths, aBorderWidths, 4);
167 PodCopy(mBorderColors, aBorderColors, 4);
168 mInnerRect = mOuterRect;
169 mInnerRect.Deflate(Margin(
170 mBorderStyles[0] != StyleBorderStyle::None ? mBorderWidths[0] : 0,
171 mBorderStyles[1] != StyleBorderStyle::None ? mBorderWidths[1] : 0,
172 mBorderStyles[2] != StyleBorderStyle::None ? mBorderWidths[2] : 0,
173 mBorderStyles[3] != StyleBorderStyle::None ? mBorderWidths[3] : 0));
174
175 ComputeBorderCornerDimensions(mBorderWidths, mBorderRadii,
176 &mBorderCornerDimensions);
177
178 mOneUnitBorder = CheckFourFloatsEqual(mBorderWidths, 1.0);
179 mNoBorderRadius = AllCornersZeroSize(mBorderRadii);
180 mAllBordersSameStyle = AreBorderSideFinalStylesSame(SideBits::eAll);
181 mAllBordersSameWidth = AllBordersSameWidth();
182 mAvoidStroke = false;
183 }
184
185 /* static */
ComputeInnerRadii(const RectCornerRadii & aRadii,const Float * aBorderSizes,RectCornerRadii * aInnerRadiiRet)186 void nsCSSBorderRenderer::ComputeInnerRadii(const RectCornerRadii& aRadii,
187 const Float* aBorderSizes,
188 RectCornerRadii* aInnerRadiiRet) {
189 RectCornerRadii& iRadii = *aInnerRadiiRet;
190
191 iRadii[C_TL].width =
192 std::max(0.f, aRadii[C_TL].width - aBorderSizes[eSideLeft]);
193 iRadii[C_TL].height =
194 std::max(0.f, aRadii[C_TL].height - aBorderSizes[eSideTop]);
195
196 iRadii[C_TR].width =
197 std::max(0.f, aRadii[C_TR].width - aBorderSizes[eSideRight]);
198 iRadii[C_TR].height =
199 std::max(0.f, aRadii[C_TR].height - aBorderSizes[eSideTop]);
200
201 iRadii[C_BR].width =
202 std::max(0.f, aRadii[C_BR].width - aBorderSizes[eSideRight]);
203 iRadii[C_BR].height =
204 std::max(0.f, aRadii[C_BR].height - aBorderSizes[eSideBottom]);
205
206 iRadii[C_BL].width =
207 std::max(0.f, aRadii[C_BL].width - aBorderSizes[eSideLeft]);
208 iRadii[C_BL].height =
209 std::max(0.f, aRadii[C_BL].height - aBorderSizes[eSideBottom]);
210 }
211
212 /* static */
ComputeOuterRadii(const RectCornerRadii & aRadii,const Float * aBorderSizes,RectCornerRadii * aOuterRadiiRet)213 void nsCSSBorderRenderer::ComputeOuterRadii(const RectCornerRadii& aRadii,
214 const Float* aBorderSizes,
215 RectCornerRadii* aOuterRadiiRet) {
216 RectCornerRadii& oRadii = *aOuterRadiiRet;
217
218 // default all corners to sharp corners
219 oRadii = RectCornerRadii(0.f);
220
221 // round the edges that have radii > 0.0 to start with
222 if (aRadii[C_TL].width > 0.f && aRadii[C_TL].height > 0.f) {
223 oRadii[C_TL].width =
224 std::max(0.f, aRadii[C_TL].width + aBorderSizes[eSideLeft]);
225 oRadii[C_TL].height =
226 std::max(0.f, aRadii[C_TL].height + aBorderSizes[eSideTop]);
227 }
228
229 if (aRadii[C_TR].width > 0.f && aRadii[C_TR].height > 0.f) {
230 oRadii[C_TR].width =
231 std::max(0.f, aRadii[C_TR].width + aBorderSizes[eSideRight]);
232 oRadii[C_TR].height =
233 std::max(0.f, aRadii[C_TR].height + aBorderSizes[eSideTop]);
234 }
235
236 if (aRadii[C_BR].width > 0.f && aRadii[C_BR].height > 0.f) {
237 oRadii[C_BR].width =
238 std::max(0.f, aRadii[C_BR].width + aBorderSizes[eSideRight]);
239 oRadii[C_BR].height =
240 std::max(0.f, aRadii[C_BR].height + aBorderSizes[eSideBottom]);
241 }
242
243 if (aRadii[C_BL].width > 0.f && aRadii[C_BL].height > 0.f) {
244 oRadii[C_BL].width =
245 std::max(0.f, aRadii[C_BL].width + aBorderSizes[eSideLeft]);
246 oRadii[C_BL].height =
247 std::max(0.f, aRadii[C_BL].height + aBorderSizes[eSideBottom]);
248 }
249 }
250
ComputeBorderCornerDimensions(const Float * aBorderWidths,const RectCornerRadii & aRadii,RectCornerRadii * aDimsRet)251 /*static*/ void ComputeBorderCornerDimensions(const Float* aBorderWidths,
252 const RectCornerRadii& aRadii,
253 RectCornerRadii* aDimsRet) {
254 Float leftWidth = aBorderWidths[eSideLeft];
255 Float topWidth = aBorderWidths[eSideTop];
256 Float rightWidth = aBorderWidths[eSideRight];
257 Float bottomWidth = aBorderWidths[eSideBottom];
258
259 if (nsCSSBorderRenderer::AllCornersZeroSize(aRadii)) {
260 // These will always be in pixel units from CSS
261 (*aDimsRet)[C_TL] = Size(leftWidth, topWidth);
262 (*aDimsRet)[C_TR] = Size(rightWidth, topWidth);
263 (*aDimsRet)[C_BR] = Size(rightWidth, bottomWidth);
264 (*aDimsRet)[C_BL] = Size(leftWidth, bottomWidth);
265 } else {
266 // Always round up to whole pixels for the corners; it's safe to
267 // make the corners bigger than necessary, and this way we ensure
268 // that we avoid seams.
269 (*aDimsRet)[C_TL] = Size(ceil(std::max(leftWidth, aRadii[C_TL].width)),
270 ceil(std::max(topWidth, aRadii[C_TL].height)));
271 (*aDimsRet)[C_TR] = Size(ceil(std::max(rightWidth, aRadii[C_TR].width)),
272 ceil(std::max(topWidth, aRadii[C_TR].height)));
273 (*aDimsRet)[C_BR] = Size(ceil(std::max(rightWidth, aRadii[C_BR].width)),
274 ceil(std::max(bottomWidth, aRadii[C_BR].height)));
275 (*aDimsRet)[C_BL] = Size(ceil(std::max(leftWidth, aRadii[C_BL].width)),
276 ceil(std::max(bottomWidth, aRadii[C_BL].height)));
277 }
278 }
279
AreBorderSideFinalStylesSame(mozilla::SideBits aSides)280 bool nsCSSBorderRenderer::AreBorderSideFinalStylesSame(
281 mozilla::SideBits aSides) {
282 NS_ASSERTION(aSides != SideBits::eNone &&
283 (aSides & ~SideBits::eAll) == SideBits::eNone,
284 "AreBorderSidesSame: invalid whichSides!");
285
286 /* First check if the specified styles and colors are the same for all sides
287 */
288 int firstStyle = 0;
289 for (const auto i : mozilla::AllPhysicalSides()) {
290 if (firstStyle == i) {
291 if ((static_cast<mozilla::SideBits>(1 << i) & aSides) ==
292 SideBits::eNone) {
293 firstStyle++;
294 }
295 continue;
296 }
297
298 if ((static_cast<mozilla::SideBits>(1 << i) & aSides) == SideBits::eNone) {
299 continue;
300 }
301
302 if (mBorderStyles[firstStyle] != mBorderStyles[i] ||
303 mBorderColors[firstStyle] != mBorderColors[i]) {
304 return false;
305 }
306 }
307
308 /* Then if it's one of the two-tone styles and we're not
309 * just comparing the TL or BR sides */
310 switch (mBorderStyles[firstStyle]) {
311 case StyleBorderStyle::Groove:
312 case StyleBorderStyle::Ridge:
313 case StyleBorderStyle::Inset:
314 case StyleBorderStyle::Outset:
315 return ((aSides & ~(SideBits::eTop | SideBits::eLeft)) ==
316 SideBits::eNone ||
317 (aSides & ~(SideBits::eBottom | SideBits::eRight)) ==
318 SideBits::eNone);
319 default:
320 return true;
321 }
322 }
323
IsSolidCornerStyle(StyleBorderStyle aStyle,Corner aCorner)324 bool nsCSSBorderRenderer::IsSolidCornerStyle(StyleBorderStyle aStyle,
325 Corner aCorner) {
326 switch (aStyle) {
327 case StyleBorderStyle::Solid:
328 return true;
329
330 case StyleBorderStyle::Inset:
331 case StyleBorderStyle::Outset:
332 return (aCorner == eCornerTopLeft || aCorner == eCornerBottomRight);
333
334 case StyleBorderStyle::Groove:
335 case StyleBorderStyle::Ridge:
336 return mOneUnitBorder &&
337 (aCorner == eCornerTopLeft || aCorner == eCornerBottomRight);
338
339 case StyleBorderStyle::Double:
340 return mOneUnitBorder;
341
342 default:
343 return false;
344 }
345 }
346
IsCornerMergeable(Corner aCorner)347 bool nsCSSBorderRenderer::IsCornerMergeable(Corner aCorner) {
348 // Corner between dotted borders with same width and small radii is
349 // merged into single dot.
350 //
351 // widthH / 2.0
352 // |<---------->|
353 // | |
354 // |radius.width|
355 // |<--->| |
356 // | | |
357 // | _+------+------------+-----
358 // | / ###|### |
359 // |/ #######|####### |
360 // + #########|######### |
361 // | ##########|########## |
362 // | ###########|########### |
363 // | ###########|########### |
364 // |############|############|
365 // +------------+############|
366 // |#########################|
367 // | ####################### |
368 // | ####################### |
369 // | ##################### |
370 // | ################### |
371 // | ############### |
372 // | ####### |
373 // +-------------------------+----
374 // | |
375 // | |
376 mozilla::Side sideH(GetHorizontalSide(aCorner));
377 mozilla::Side sideV(GetVerticalSide(aCorner));
378 StyleBorderStyle styleH = mBorderStyles[sideH];
379 StyleBorderStyle styleV = mBorderStyles[sideV];
380 if (styleH != styleV || styleH != StyleBorderStyle::Dotted) {
381 return false;
382 }
383
384 Float widthH = mBorderWidths[sideH];
385 Float widthV = mBorderWidths[sideV];
386 if (widthH != widthV) {
387 return false;
388 }
389
390 Size radius = mBorderRadii[aCorner];
391 return IsZeroSize(radius) ||
392 (radius.width < widthH / 2.0f && radius.height < widthH / 2.0f);
393 }
394
BorderColorStyleForSolidCorner(StyleBorderStyle aStyle,Corner aCorner)395 BorderColorStyle nsCSSBorderRenderer::BorderColorStyleForSolidCorner(
396 StyleBorderStyle aStyle, Corner aCorner) {
397 // note that this function assumes that the corner is already solid,
398 // as per the earlier function
399 switch (aStyle) {
400 case StyleBorderStyle::Solid:
401 case StyleBorderStyle::Double:
402 return BorderColorStyleSolid;
403
404 case StyleBorderStyle::Inset:
405 case StyleBorderStyle::Groove:
406 if (aCorner == eCornerTopLeft) {
407 return BorderColorStyleDark;
408 } else if (aCorner == eCornerBottomRight) {
409 return BorderColorStyleLight;
410 }
411 break;
412
413 case StyleBorderStyle::Outset:
414 case StyleBorderStyle::Ridge:
415 if (aCorner == eCornerTopLeft) {
416 return BorderColorStyleLight;
417 } else if (aCorner == eCornerBottomRight) {
418 return BorderColorStyleDark;
419 }
420 break;
421 default:
422 return BorderColorStyleNone;
423 }
424
425 return BorderColorStyleNone;
426 }
427
GetCornerRect(Corner aCorner)428 Rect nsCSSBorderRenderer::GetCornerRect(Corner aCorner) {
429 Point offset(0.f, 0.f);
430
431 if (aCorner == C_TR || aCorner == C_BR)
432 offset.x = mOuterRect.Width() - mBorderCornerDimensions[aCorner].width;
433 if (aCorner == C_BR || aCorner == C_BL)
434 offset.y = mOuterRect.Height() - mBorderCornerDimensions[aCorner].height;
435
436 return Rect(mOuterRect.TopLeft() + offset, mBorderCornerDimensions[aCorner]);
437 }
438
GetSideClipWithoutCornersRect(mozilla::Side aSide)439 Rect nsCSSBorderRenderer::GetSideClipWithoutCornersRect(mozilla::Side aSide) {
440 Point offset(0.f, 0.f);
441
442 // The offset from the outside rect to the start of this side's
443 // box. For the top and bottom sides, the height of the box
444 // must be the border height; the x start must take into account
445 // the corner size (which may be bigger than the right or left
446 // side's width). The same applies to the right and left sides.
447 if (aSide == eSideTop) {
448 offset.x = mBorderCornerDimensions[C_TL].width;
449 } else if (aSide == eSideRight) {
450 offset.x = mOuterRect.Width() - mBorderWidths[eSideRight];
451 offset.y = mBorderCornerDimensions[C_TR].height;
452 } else if (aSide == eSideBottom) {
453 offset.x = mBorderCornerDimensions[C_BL].width;
454 offset.y = mOuterRect.Height() - mBorderWidths[eSideBottom];
455 } else if (aSide == eSideLeft) {
456 offset.y = mBorderCornerDimensions[C_TL].height;
457 }
458
459 // The sum of the width & height of the corners adjacent to the
460 // side. This relies on the relationship between side indexing and
461 // corner indexing; that is, 0 == SIDE_TOP and 0 == CORNER_TOP_LEFT,
462 // with both proceeding clockwise.
463 Size sideCornerSum = mBorderCornerDimensions[GetCCWCorner(aSide)] +
464 mBorderCornerDimensions[GetCWCorner(aSide)];
465 Rect rect(mOuterRect.TopLeft() + offset, mOuterRect.Size() - sideCornerSum);
466
467 if (IsHorizontalSide(aSide))
468 rect.height = mBorderWidths[aSide];
469 else
470 rect.width = mBorderWidths[aSide];
471
472 return rect;
473 }
474
475 // The side border type and the adjacent border types are
476 // examined and one of the different types of clipping (listed
477 // below) is selected.
478
479 typedef enum {
480 // clip to the trapezoid formed by the corners of the
481 // inner and outer rectangles for the given side
482 //
483 // +---------------
484 // |\%%%%%%%%%%%%%%
485 // | \%%%%%%%%%%%%
486 // | \%%%%%%%%%%%
487 // | \%%%%%%%%%
488 // | +--------
489 // | |
490 // | |
491 SIDE_CLIP_TRAPEZOID,
492
493 // clip to the trapezoid formed by the outer rectangle
494 // corners and the center of the region, making sure
495 // that diagonal lines all go directly from the outside
496 // corner to the inside corner, but that they then continue on
497 // to the middle.
498 //
499 // This is needed for correctly clipping rounded borders,
500 // which might extend past the SIDE_CLIP_TRAPEZOID trap.
501 //
502 // +-------__--+---
503 // \%%%%_-%%%%%%%%
504 // \+-%%%%%%%%%%
505 // / \%%%%%%%%%%
506 // / \%%%%%%%%%
507 // | +%%_-+---
508 // | +%%%%%%
509 // | / \%%%%%
510 // + + \%%%
511 // | | +-
512 SIDE_CLIP_TRAPEZOID_FULL,
513
514 // clip to the rectangle formed by the given side including corner.
515 // This is used by the non-dotted side next to dotted side.
516 //
517 // +---------------
518 // |%%%%%%%%%%%%%%%
519 // |%%%%%%%%%%%%%%%
520 // |%%%%%%%%%%%%%%%
521 // |%%%%%%%%%%%%%%%
522 // +------+--------
523 // | |
524 // | |
525 SIDE_CLIP_RECTANGLE_CORNER,
526
527 // clip to the rectangle formed by the given side excluding corner.
528 // This is used by the dotted side next to non-dotted side.
529 //
530 // +------+--------
531 // | |%%%%%%%%
532 // | |%%%%%%%%
533 // | |%%%%%%%%
534 // | |%%%%%%%%
535 // | +--------
536 // | |
537 // | |
538 SIDE_CLIP_RECTANGLE_NO_CORNER,
539 } SideClipType;
540
541 // Given three points, p0, p1, and midPoint, move p1 further in to the
542 // rectangle (of which aMidPoint is the center) so that it reaches the
543 // closer of the horizontal or vertical lines intersecting the midpoint,
544 // while maintaing the slope of the line. If p0 and p1 are the same,
545 // just move p1 to midPoint (since there's no slope to maintain).
546 // FIXME: Extending only to the midpoint isn't actually sufficient for
547 // boxes with asymmetric radii.
MaybeMoveToMidPoint(Point & aP0,Point & aP1,const Point & aMidPoint)548 static void MaybeMoveToMidPoint(Point& aP0, Point& aP1,
549 const Point& aMidPoint) {
550 Point ps = aP1 - aP0;
551
552 if (ps.x == 0.0) {
553 if (ps.y == 0.0) {
554 aP1 = aMidPoint;
555 } else {
556 aP1.y = aMidPoint.y;
557 }
558 } else {
559 if (ps.y == 0.0) {
560 aP1.x = aMidPoint.x;
561 } else {
562 Float k =
563 std::min((aMidPoint.x - aP0.x) / ps.x, (aMidPoint.y - aP0.y) / ps.y);
564 aP1 = aP0 + ps * k;
565 }
566 }
567 }
568
GetSideClipSubPath(mozilla::Side aSide)569 already_AddRefed<Path> nsCSSBorderRenderer::GetSideClipSubPath(
570 mozilla::Side aSide) {
571 // the clip proceeds clockwise from the top left corner;
572 // so "start" in each case is the start of the region from that side.
573 //
574 // the final path will be formed like:
575 // s0 ------- e0
576 // | /
577 // s1 ----- e1
578 //
579 // that is, the second point will always be on the inside
580
581 Point start[2];
582 Point end[2];
583
584 #define IS_DOTTED(_s) ((_s) == StyleBorderStyle::Dotted)
585 bool isDotted = IS_DOTTED(mBorderStyles[aSide]);
586 bool startIsDotted = IS_DOTTED(mBorderStyles[PREV_SIDE(aSide)]);
587 bool endIsDotted = IS_DOTTED(mBorderStyles[NEXT_SIDE(aSide)]);
588 #undef IS_DOTTED
589
590 SideClipType startType = SIDE_CLIP_TRAPEZOID;
591 SideClipType endType = SIDE_CLIP_TRAPEZOID;
592
593 if (!IsZeroSize(mBorderRadii[GetCCWCorner(aSide)])) {
594 startType = SIDE_CLIP_TRAPEZOID_FULL;
595 } else if (startIsDotted && !isDotted) {
596 startType = SIDE_CLIP_RECTANGLE_CORNER;
597 } else if (!startIsDotted && isDotted) {
598 startType = SIDE_CLIP_RECTANGLE_NO_CORNER;
599 }
600
601 if (!IsZeroSize(mBorderRadii[GetCWCorner(aSide)])) {
602 endType = SIDE_CLIP_TRAPEZOID_FULL;
603 } else if (endIsDotted && !isDotted) {
604 endType = SIDE_CLIP_RECTANGLE_CORNER;
605 } else if (!endIsDotted && isDotted) {
606 endType = SIDE_CLIP_RECTANGLE_NO_CORNER;
607 }
608
609 Point midPoint = mInnerRect.Center();
610
611 start[0] = mOuterRect.CCWCorner(aSide);
612 start[1] = mInnerRect.CCWCorner(aSide);
613
614 end[0] = mOuterRect.CWCorner(aSide);
615 end[1] = mInnerRect.CWCorner(aSide);
616
617 if (startType == SIDE_CLIP_TRAPEZOID_FULL) {
618 MaybeMoveToMidPoint(start[0], start[1], midPoint);
619 } else if (startType == SIDE_CLIP_RECTANGLE_CORNER) {
620 if (IsHorizontalSide(aSide)) {
621 start[1] =
622 Point(mOuterRect.CCWCorner(aSide).x, mInnerRect.CCWCorner(aSide).y);
623 } else {
624 start[1] =
625 Point(mInnerRect.CCWCorner(aSide).x, mOuterRect.CCWCorner(aSide).y);
626 }
627 } else if (startType == SIDE_CLIP_RECTANGLE_NO_CORNER) {
628 if (IsHorizontalSide(aSide)) {
629 start[0] =
630 Point(mInnerRect.CCWCorner(aSide).x, mOuterRect.CCWCorner(aSide).y);
631 } else {
632 start[0] =
633 Point(mOuterRect.CCWCorner(aSide).x, mInnerRect.CCWCorner(aSide).y);
634 }
635 }
636
637 if (endType == SIDE_CLIP_TRAPEZOID_FULL) {
638 MaybeMoveToMidPoint(end[0], end[1], midPoint);
639 } else if (endType == SIDE_CLIP_RECTANGLE_CORNER) {
640 if (IsHorizontalSide(aSide)) {
641 end[1] =
642 Point(mOuterRect.CWCorner(aSide).x, mInnerRect.CWCorner(aSide).y);
643 } else {
644 end[1] =
645 Point(mInnerRect.CWCorner(aSide).x, mOuterRect.CWCorner(aSide).y);
646 }
647 } else if (endType == SIDE_CLIP_RECTANGLE_NO_CORNER) {
648 if (IsHorizontalSide(aSide)) {
649 end[0] =
650 Point(mInnerRect.CWCorner(aSide).x, mOuterRect.CWCorner(aSide).y);
651 } else {
652 end[0] =
653 Point(mOuterRect.CWCorner(aSide).x, mInnerRect.CWCorner(aSide).y);
654 }
655 }
656
657 RefPtr<PathBuilder> builder = mDrawTarget->CreatePathBuilder();
658 builder->MoveTo(start[0]);
659 builder->LineTo(end[0]);
660 builder->LineTo(end[1]);
661 builder->LineTo(start[1]);
662 builder->Close();
663 return builder->Finish();
664 }
665
GetStraightBorderPoint(mozilla::Side aSide,Corner aCorner,bool * aIsUnfilled,Float aDotOffset)666 Point nsCSSBorderRenderer::GetStraightBorderPoint(mozilla::Side aSide,
667 Corner aCorner,
668 bool* aIsUnfilled,
669 Float aDotOffset) {
670 // Calculate the end point of the side for dashed/dotted border, that is also
671 // the end point of the corner curve. The point is specified by aSide and
672 // aCorner. (e.g. eSideTop and C_TL means the left end of border-top)
673 //
674 //
675 // aCorner aSide
676 // +--------------------
677 // |
678 // |
679 // | +----------
680 // | the end point
681 // |
682 // | +----------
683 // | |
684 // | |
685 // | |
686 //
687 // The position of the point depends on the border-style, border-width, and
688 // border-radius of the side, corner, and the adjacent side beyond the corner,
689 // to make those sides (and corner) interact well.
690 //
691 // If the style of aSide is dotted and the dot at the point should be
692 // unfilled, true is stored to *aIsUnfilled, otherwise false is stored.
693
694 const Float signsList[4][2] = {
695 {+1.0f, +1.0f}, {-1.0f, +1.0f}, {-1.0f, -1.0f}, {+1.0f, -1.0f}};
696 const Float(&signs)[2] = signsList[aCorner];
697
698 *aIsUnfilled = false;
699
700 Point P = mOuterRect.AtCorner(aCorner);
701 StyleBorderStyle style = mBorderStyles[aSide];
702 Float borderWidth = mBorderWidths[aSide];
703 Size dim = mBorderCornerDimensions[aCorner];
704 bool isHorizontal = IsHorizontalSide(aSide);
705 //
706 // aCorner aSide
707 // +--------------
708 // |
709 // | +----------
710 // | |
711 // otherSide | |
712 // | |
713 mozilla::Side otherSide = ((uint8_t)aSide == (uint8_t)aCorner)
714 ? PREV_SIDE(aSide)
715 : NEXT_SIDE(aSide);
716 StyleBorderStyle otherStyle = mBorderStyles[otherSide];
717 Float otherBorderWidth = mBorderWidths[otherSide];
718 Size radius = mBorderRadii[aCorner];
719 if (IsZeroSize(radius)) {
720 radius.width = 0.0f;
721 radius.height = 0.0f;
722 }
723 if (style == StyleBorderStyle::Dotted) {
724 // Offset the dot's location along the side toward the corner by a
725 // multiple of its width.
726 if (isHorizontal) {
727 P.x -= signs[0] * aDotOffset * borderWidth;
728 } else {
729 P.y -= signs[1] * aDotOffset * borderWidth;
730 }
731 }
732 if (style == StyleBorderStyle::Dotted &&
733 otherStyle == StyleBorderStyle::Dotted) {
734 if (borderWidth == otherBorderWidth) {
735 if (radius.width < borderWidth / 2.0f &&
736 radius.height < borderWidth / 2.0f) {
737 // Two dots are merged into one and placed at the corner.
738 //
739 // borderWidth / 2.0
740 // |<---------->|
741 // | |
742 // |radius.width|
743 // |<--->| |
744 // | | |
745 // | _+------+------------+-----
746 // | / ###|### |
747 // |/ #######|####### |
748 // + #########|######### |
749 // | ##########|########## |
750 // | ###########|########### |
751 // | ###########|########### |
752 // |############|############|
753 // +------------+############|
754 // |########### P ###########|
755 // | ####################### |
756 // | ####################### |
757 // | ##################### |
758 // | ################### |
759 // | ############### |
760 // | ####### |
761 // +-------------------------+----
762 // | |
763 // | |
764 P.x += signs[0] * borderWidth / 2.0f;
765 P.y += signs[1] * borderWidth / 2.0f;
766 } else {
767 // Two dots are drawn separately.
768 //
769 // borderWidth * 1.5
770 // |<------------>|
771 // | |
772 // |radius.width |
773 // |<----->| |
774 // | | |
775 // | _--+-+----+---
776 // | _- | ##|##
777 // | / | ###|###
778 // |/ |####|####
779 // | |####+####
780 // | |### P ###
781 // + | ###|###
782 // | | ##|##
783 // +---------+----+---
784 // | ##### |
785 // | ####### |
786 // |#########|
787 // +----+----+
788 // |#########|
789 // | ####### |
790 // | ##### |
791 // | |
792 //
793 // There should be enough gap between 2 dots even if radius.width is
794 // small but larger than borderWidth / 2.0. borderWidth * 1.5 is the
795 // value that there's imaginally unfilled dot at the corner. The
796 // unfilled dot may overflow from the outer curve, but filled dots
797 // doesn't, so this could be acceptable solution at least for now.
798 // We may have to find better model/value.
799 //
800 // imaginally unfilled dot at the corner
801 // |
802 // v +----+---
803 // ***** | ##|##
804 // ******* | ###|###
805 // *********|####|####
806 // *********|####+####
807 // *********|### P ###
808 // ******* | ###|###
809 // ***** | ##|##
810 // +---------+----+---
811 // | ##### |
812 // | ####### |
813 // |#########|
814 // +----+----+
815 // |#########|
816 // | ####### |
817 // | ##### |
818 // | |
819 Float minimum = borderWidth * 1.5f;
820 if (isHorizontal) {
821 P.x += signs[0] * std::max(radius.width, minimum);
822 P.y += signs[1] * borderWidth / 2.0f;
823 } else {
824 P.x += signs[0] * borderWidth / 2.0f;
825 P.y += signs[1] * std::max(radius.height, minimum);
826 }
827 }
828
829 return P;
830 }
831
832 if (borderWidth < otherBorderWidth) {
833 // This side is smaller than other side, other side draws the corner.
834 //
835 // otherBorderWidth + borderWidth / 2.0
836 // |<---------->|
837 // | |
838 // +---------+--+--------
839 // | ##### | *|* ###
840 // | ####### |**|**#####
841 // |#########|**+**##+##
842 // |####+####|* P *#####
843 // |#########| *** ###
844 // | ####### +-----------
845 // | ##### | ^
846 // | | |
847 // | | first dot is not filled
848 // | |
849 //
850 // radius.width
851 // |<----------------->|
852 // | |
853 // | ___---+-------------
854 // | __-- #|# ###
855 // | _- ##|## #####
856 // | / ##+## ##+##
857 // | / # P # #####
858 // | | #|# ###
859 // | | __--+-------------
860 // || _- ^
861 // || / |
862 // | / first dot is filled
863 // | |
864 // | |
865 // | ##### |
866 // | ####### |
867 // |#########|
868 // +----+----+
869 // |#########|
870 // | ####### |
871 // | ##### |
872 Float minimum = otherBorderWidth + borderWidth / 2.0f;
873 if (isHorizontal) {
874 if (radius.width < minimum) {
875 *aIsUnfilled = true;
876 P.x += signs[0] * minimum;
877 } else {
878 P.x += signs[0] * radius.width;
879 }
880 P.y += signs[1] * borderWidth / 2.0f;
881 } else {
882 P.x += signs[0] * borderWidth / 2.0f;
883 if (radius.height < minimum) {
884 *aIsUnfilled = true;
885 P.y += signs[1] * minimum;
886 } else {
887 P.y += signs[1] * radius.height;
888 }
889 }
890
891 return P;
892 }
893
894 // This side is larger than other side, this side draws the corner.
895 //
896 // borderWidth / 2.0
897 // |<-->|
898 // | |
899 // +----+---------------------
900 // | ##|## #####
901 // | ###|### #######
902 // |####|#### #########
903 // |####+#### ####+####
904 // |### P ### #########
905 // | ####### #######
906 // | ##### #####
907 // +-----+---------------------
908 // | *** |
909 // |*****|
910 // |**+**| <-- first dot in other side is not filled
911 // |*****|
912 // | *** |
913 // | ### |
914 // |#####|
915 // |##+##|
916 // |#####|
917 // | ### |
918 // | |
919 if (isHorizontal) {
920 P.x += signs[0] * std::max(radius.width, borderWidth / 2.0f);
921 P.y += signs[1] * borderWidth / 2.0f;
922 } else {
923 P.x += signs[0] * borderWidth / 2.0f;
924 P.y += signs[1] * std::max(radius.height, borderWidth / 2.0f);
925 }
926 return P;
927 }
928
929 if (style == StyleBorderStyle::Dotted) {
930 // If only this side is dotted, other side draws the corner.
931 //
932 // otherBorderWidth + borderWidth / 2.0
933 // |<------->|
934 // | |
935 // +------+--+--------
936 // |## ##| *|* ###
937 // |## ##|**|**#####
938 // |## ##|**+**##+##
939 // |## ##|* P *#####
940 // |## ##| *** ###
941 // |## ##+-----------
942 // |## ##| ^
943 // |## ##| |
944 // |## ##| first dot is not filled
945 // |## ##|
946 //
947 // radius.width
948 // |<----------------->|
949 // | |
950 // | ___---+-------------
951 // | __-- #|# ###
952 // | _- ##|## #####
953 // | / ##+## ##+##
954 // | / # P # #####
955 // | | #|# ###
956 // | | __--+-------------
957 // || _- ^
958 // || / |
959 // | / first dot is filled
960 // | |
961 // | |
962 // | |
963 // | |
964 // | |
965 // +------+
966 // |## ##|
967 // |## ##|
968 // |## ##|
969 Float minimum = otherBorderWidth + borderWidth / 2.0f;
970 if (isHorizontal) {
971 if (radius.width < minimum) {
972 *aIsUnfilled = true;
973 P.x += signs[0] * minimum;
974 } else {
975 P.x += signs[0] * radius.width;
976 }
977 P.y += signs[1] * borderWidth / 2.0f;
978 } else {
979 P.x += signs[0] * borderWidth / 2.0f;
980 if (radius.height < minimum) {
981 *aIsUnfilled = true;
982 P.y += signs[1] * minimum;
983 } else {
984 P.y += signs[1] * radius.height;
985 }
986 }
987 return P;
988 }
989
990 if (otherStyle == StyleBorderStyle::Dotted && IsZeroSize(radius)) {
991 // If other side is dotted and radius=0, draw side to the end of corner.
992 //
993 // +-------------------------------
994 // |########## ##########
995 // P +########## ##########
996 // |########## ##########
997 // +-----+-------------------------
998 // | *** |
999 // |*****|
1000 // |**+**| <-- first dot in other side is not filled
1001 // |*****|
1002 // | *** |
1003 // | ### |
1004 // |#####|
1005 // |##+##|
1006 // |#####|
1007 // | ### |
1008 // | |
1009 if (isHorizontal) {
1010 P.y += signs[1] * borderWidth / 2.0f;
1011 } else {
1012 P.x += signs[0] * borderWidth / 2.0f;
1013 }
1014 return P;
1015 }
1016
1017 // Other cases.
1018 //
1019 // dim.width
1020 // |<----------------->|
1021 // | |
1022 // | ___---+------------------
1023 // | __-- |####### ###
1024 // | _- P +####### ###
1025 // | / |####### ###
1026 // | / __---+------------------
1027 // | | __--
1028 // | | /
1029 // || /
1030 // || |
1031 // | |
1032 // | |
1033 // | |
1034 // | |
1035 // +-+-+
1036 // |###|
1037 // |###|
1038 // |###|
1039 // |###|
1040 // |###|
1041 // | |
1042 // | |
1043 if (isHorizontal) {
1044 P.x += signs[0] * dim.width;
1045 P.y += signs[1] * borderWidth / 2.0f;
1046 } else {
1047 P.x += signs[0] * borderWidth / 2.0f;
1048 P.y += signs[1] * dim.height;
1049 }
1050
1051 return P;
1052 }
1053
GetOuterAndInnerBezier(Bezier * aOuterBezier,Bezier * aInnerBezier,Corner aCorner)1054 void nsCSSBorderRenderer::GetOuterAndInnerBezier(Bezier* aOuterBezier,
1055 Bezier* aInnerBezier,
1056 Corner aCorner) {
1057 // Return bezier control points for outer and inner curve for given corner.
1058 //
1059 // ___---+ outer curve
1060 // __-- |
1061 // _- |
1062 // / |
1063 // / |
1064 // | |
1065 // | __--+ inner curve
1066 // | _-
1067 // | /
1068 // | /
1069 // | |
1070 // | |
1071 // | |
1072 // | |
1073 // | |
1074 // +---------+
1075
1076 mozilla::Side sideH(GetHorizontalSide(aCorner));
1077 mozilla::Side sideV(GetVerticalSide(aCorner));
1078
1079 Size outerCornerSize(ceil(mBorderRadii[aCorner].width),
1080 ceil(mBorderRadii[aCorner].height));
1081 Size innerCornerSize(
1082 ceil(std::max(0.0f, mBorderRadii[aCorner].width - mBorderWidths[sideV])),
1083 ceil(
1084 std::max(0.0f, mBorderRadii[aCorner].height - mBorderWidths[sideH])));
1085
1086 GetBezierPointsForCorner(aOuterBezier, aCorner, mOuterRect.AtCorner(aCorner),
1087 outerCornerSize);
1088
1089 GetBezierPointsForCorner(aInnerBezier, aCorner, mInnerRect.AtCorner(aCorner),
1090 innerCornerSize);
1091 }
1092
FillSolidBorder(const Rect & aOuterRect,const Rect & aInnerRect,const RectCornerRadii & aBorderRadii,const Float * aBorderSizes,SideBits aSides,const ColorPattern & aColor)1093 void nsCSSBorderRenderer::FillSolidBorder(const Rect& aOuterRect,
1094 const Rect& aInnerRect,
1095 const RectCornerRadii& aBorderRadii,
1096 const Float* aBorderSizes,
1097 SideBits aSides,
1098 const ColorPattern& aColor) {
1099 // Note that this function is allowed to draw more than just the
1100 // requested sides.
1101
1102 // If we have a border radius, do full rounded rectangles
1103 // and fill, regardless of what sides we're asked to draw.
1104 if (!AllCornersZeroSize(aBorderRadii)) {
1105 RefPtr<PathBuilder> builder = mDrawTarget->CreatePathBuilder();
1106
1107 RectCornerRadii innerRadii;
1108 ComputeInnerRadii(aBorderRadii, aBorderSizes, &innerRadii);
1109
1110 // do the outer border
1111 AppendRoundedRectToPath(builder, aOuterRect, aBorderRadii, true);
1112
1113 // then do the inner border CCW
1114 AppendRoundedRectToPath(builder, aInnerRect, innerRadii, false);
1115
1116 RefPtr<Path> path = builder->Finish();
1117
1118 mDrawTarget->Fill(path, aColor);
1119 return;
1120 }
1121
1122 // If we're asked to draw all sides of an equal-sized border,
1123 // stroking is fastest. This is a fairly common path, but partial
1124 // sides is probably second in the list -- there are a bunch of
1125 // common border styles, such as inset and outset, that are
1126 // top-left/bottom-right split.
1127 if (aSides == SideBits::eAll &&
1128 CheckFourFloatsEqual(aBorderSizes, aBorderSizes[0]) && !mAvoidStroke) {
1129 Float strokeWidth = aBorderSizes[0];
1130 Rect r(aOuterRect);
1131 r.Deflate(strokeWidth / 2.f);
1132 mDrawTarget->StrokeRect(r, aColor, StrokeOptions(strokeWidth));
1133 return;
1134 }
1135
1136 // Otherwise, we have unequal sized borders or we're only
1137 // drawing some sides; create rectangles for each side
1138 // and fill them.
1139
1140 Rect r[4];
1141
1142 // compute base rects for each side
1143 if (aSides & SideBits::eTop) {
1144 r[eSideTop] = Rect(aOuterRect.X(), aOuterRect.Y(), aOuterRect.Width(),
1145 aBorderSizes[eSideTop]);
1146 }
1147
1148 if (aSides & SideBits::eBottom) {
1149 r[eSideBottom] =
1150 Rect(aOuterRect.X(), aOuterRect.YMost() - aBorderSizes[eSideBottom],
1151 aOuterRect.Width(), aBorderSizes[eSideBottom]);
1152 }
1153
1154 if (aSides & SideBits::eLeft) {
1155 r[eSideLeft] = Rect(aOuterRect.X(), aOuterRect.Y(), aBorderSizes[eSideLeft],
1156 aOuterRect.Height());
1157 }
1158
1159 if (aSides & SideBits::eRight) {
1160 r[eSideRight] =
1161 Rect(aOuterRect.XMost() - aBorderSizes[eSideRight], aOuterRect.Y(),
1162 aBorderSizes[eSideRight], aOuterRect.Height());
1163 }
1164
1165 // If two sides meet at a corner that we're rendering, then
1166 // make sure that we adjust one of the sides to avoid overlap.
1167 // This is especially important in the case of colors with
1168 // an alpha channel.
1169
1170 if ((aSides & (SideBits::eTop | SideBits::eLeft)) ==
1171 (SideBits::eTop | SideBits::eLeft)) {
1172 // adjust the left's top down a bit
1173 r[eSideLeft].y += aBorderSizes[eSideTop];
1174 r[eSideLeft].height -= aBorderSizes[eSideTop];
1175 }
1176
1177 if ((aSides & (SideBits::eTop | SideBits::eRight)) ==
1178 (SideBits::eTop | SideBits::eRight)) {
1179 // adjust the top's left a bit
1180 r[eSideTop].width -= aBorderSizes[eSideRight];
1181 }
1182
1183 if ((aSides & (SideBits::eBottom | SideBits::eRight)) ==
1184 (SideBits::eBottom | SideBits::eRight)) {
1185 // adjust the right's bottom a bit
1186 r[eSideRight].height -= aBorderSizes[eSideBottom];
1187 }
1188
1189 if ((aSides & (SideBits::eBottom | SideBits::eLeft)) ==
1190 (SideBits::eBottom | SideBits::eLeft)) {
1191 // adjust the bottom's left a bit
1192 r[eSideBottom].x += aBorderSizes[eSideLeft];
1193 r[eSideBottom].width -= aBorderSizes[eSideLeft];
1194 }
1195
1196 // Filling these one by one is faster than filling them all at once.
1197 for (uint32_t i = 0; i < 4; i++) {
1198 if (aSides & static_cast<mozilla::SideBits>(1 << i)) {
1199 MaybeSnapToDevicePixels(r[i], *mDrawTarget, true);
1200 mDrawTarget->FillRect(r[i], aColor);
1201 }
1202 }
1203 }
1204
MakeBorderColor(nscolor aColor,BorderColorStyle aBorderColorStyle)1205 sRGBColor MakeBorderColor(nscolor aColor, BorderColorStyle aBorderColorStyle) {
1206 nscolor colors[2];
1207 int k = 0;
1208
1209 switch (aBorderColorStyle) {
1210 case BorderColorStyleNone:
1211 return sRGBColor(0.f, 0.f, 0.f, 0.f); // transparent black
1212
1213 case BorderColorStyleLight:
1214 k = 1;
1215 [[fallthrough]];
1216 case BorderColorStyleDark:
1217 NS_GetSpecial3DColors(colors, aColor);
1218 return sRGBColor::FromABGR(colors[k]);
1219
1220 case BorderColorStyleSolid:
1221 default:
1222 return sRGBColor::FromABGR(aColor);
1223 }
1224 }
1225
ComputeColorForLine(uint32_t aLineIndex,const BorderColorStyle * aBorderColorStyle,uint32_t aBorderColorStyleCount,nscolor aBorderColor)1226 sRGBColor ComputeColorForLine(uint32_t aLineIndex,
1227 const BorderColorStyle* aBorderColorStyle,
1228 uint32_t aBorderColorStyleCount,
1229 nscolor aBorderColor) {
1230 NS_ASSERTION(aLineIndex < aBorderColorStyleCount, "Invalid lineIndex given");
1231
1232 return MakeBorderColor(aBorderColor, aBorderColorStyle[aLineIndex]);
1233 }
1234
DrawBorderSides(mozilla::SideBits aSides)1235 void nsCSSBorderRenderer::DrawBorderSides(mozilla::SideBits aSides) {
1236 if (aSides == SideBits::eNone ||
1237 (aSides & ~SideBits::eAll) != SideBits::eNone) {
1238 NS_WARNING("DrawBorderSides: invalid sides!");
1239 return;
1240 }
1241
1242 StyleBorderStyle borderRenderStyle = StyleBorderStyle::None;
1243 nscolor borderRenderColor;
1244
1245 uint32_t borderColorStyleCount = 0;
1246 BorderColorStyle borderColorStyleTopLeft[3], borderColorStyleBottomRight[3];
1247 BorderColorStyle* borderColorStyle = nullptr;
1248
1249 for (const auto i : mozilla::AllPhysicalSides()) {
1250 if ((aSides & static_cast<mozilla::SideBits>(1 << i)) == SideBits::eNone) {
1251 continue;
1252 }
1253 borderRenderStyle = mBorderStyles[i];
1254 borderRenderColor = mBorderColors[i];
1255 break;
1256 }
1257
1258 if (borderRenderStyle == StyleBorderStyle::None ||
1259 borderRenderStyle == StyleBorderStyle::Hidden) {
1260 return;
1261 }
1262
1263 if (borderRenderStyle == StyleBorderStyle::Dashed ||
1264 borderRenderStyle == StyleBorderStyle::Dotted) {
1265 // Draw each corner separately, with the given side's color.
1266 if (aSides & SideBits::eTop) {
1267 DrawDashedOrDottedCorner(eSideTop, C_TL);
1268 } else if (aSides & SideBits::eLeft) {
1269 DrawDashedOrDottedCorner(eSideLeft, C_TL);
1270 }
1271
1272 if (aSides & SideBits::eTop) {
1273 DrawDashedOrDottedCorner(eSideTop, C_TR);
1274 } else if (aSides & SideBits::eRight) {
1275 DrawDashedOrDottedCorner(eSideRight, C_TR);
1276 }
1277
1278 if (aSides & SideBits::eBottom) {
1279 DrawDashedOrDottedCorner(eSideBottom, C_BL);
1280 } else if (aSides & SideBits::eLeft) {
1281 DrawDashedOrDottedCorner(eSideLeft, C_BL);
1282 }
1283
1284 if (aSides & SideBits::eBottom) {
1285 DrawDashedOrDottedCorner(eSideBottom, C_BR);
1286 } else if (aSides & SideBits::eRight) {
1287 DrawDashedOrDottedCorner(eSideRight, C_BR);
1288 }
1289 return;
1290 }
1291
1292 // The borderColorStyle array goes from the outer to the inner style.
1293 //
1294 // If the border width is 1, we need to change the borderRenderStyle
1295 // a bit to make sure that we get the right colors -- e.g. 'ridge'
1296 // with a 1px border needs to look like solid, not like 'outset'.
1297 if (mOneUnitBorder && (borderRenderStyle == StyleBorderStyle::Ridge ||
1298 borderRenderStyle == StyleBorderStyle::Groove ||
1299 borderRenderStyle == StyleBorderStyle::Double)) {
1300 borderRenderStyle = StyleBorderStyle::Solid;
1301 }
1302
1303 switch (borderRenderStyle) {
1304 case StyleBorderStyle::Solid:
1305 borderColorStyleTopLeft[0] = BorderColorStyleSolid;
1306
1307 borderColorStyleBottomRight[0] = BorderColorStyleSolid;
1308
1309 borderColorStyleCount = 1;
1310 break;
1311
1312 case StyleBorderStyle::Groove:
1313 borderColorStyleTopLeft[0] = BorderColorStyleDark;
1314 borderColorStyleTopLeft[1] = BorderColorStyleLight;
1315
1316 borderColorStyleBottomRight[0] = BorderColorStyleLight;
1317 borderColorStyleBottomRight[1] = BorderColorStyleDark;
1318
1319 borderColorStyleCount = 2;
1320 break;
1321
1322 case StyleBorderStyle::Ridge:
1323 borderColorStyleTopLeft[0] = BorderColorStyleLight;
1324 borderColorStyleTopLeft[1] = BorderColorStyleDark;
1325
1326 borderColorStyleBottomRight[0] = BorderColorStyleDark;
1327 borderColorStyleBottomRight[1] = BorderColorStyleLight;
1328
1329 borderColorStyleCount = 2;
1330 break;
1331
1332 case StyleBorderStyle::Double:
1333 borderColorStyleTopLeft[0] = BorderColorStyleSolid;
1334 borderColorStyleTopLeft[1] = BorderColorStyleNone;
1335 borderColorStyleTopLeft[2] = BorderColorStyleSolid;
1336
1337 borderColorStyleBottomRight[0] = BorderColorStyleSolid;
1338 borderColorStyleBottomRight[1] = BorderColorStyleNone;
1339 borderColorStyleBottomRight[2] = BorderColorStyleSolid;
1340
1341 borderColorStyleCount = 3;
1342 break;
1343
1344 case StyleBorderStyle::Inset:
1345 borderColorStyleTopLeft[0] = BorderColorStyleDark;
1346 borderColorStyleBottomRight[0] = BorderColorStyleLight;
1347
1348 borderColorStyleCount = 1;
1349 break;
1350
1351 case StyleBorderStyle::Outset:
1352 borderColorStyleTopLeft[0] = BorderColorStyleLight;
1353 borderColorStyleBottomRight[0] = BorderColorStyleDark;
1354
1355 borderColorStyleCount = 1;
1356 break;
1357
1358 default:
1359 MOZ_ASSERT_UNREACHABLE("Unhandled border style!!");
1360 break;
1361 }
1362
1363 // The only way to get to here is by having a
1364 // borderColorStyleCount < 1 or > 3; this should never happen,
1365 // since -moz-border-colors doesn't get handled here.
1366 NS_ASSERTION(borderColorStyleCount > 0 && borderColorStyleCount < 4,
1367 "Non-border-colors case with borderColorStyleCount < 1 or > 3; "
1368 "what happened?");
1369
1370 // The caller should never give us anything with a mix
1371 // of TL/BR if the border style would require a
1372 // TL/BR split.
1373 if (aSides & (SideBits::eBottom | SideBits::eRight)) {
1374 borderColorStyle = borderColorStyleBottomRight;
1375 } else {
1376 borderColorStyle = borderColorStyleTopLeft;
1377 }
1378
1379 // Distribute the border across the available space.
1380 Float borderWidths[3][4];
1381
1382 if (borderColorStyleCount == 1) {
1383 for (const auto i : mozilla::AllPhysicalSides()) {
1384 borderWidths[0][i] = mBorderWidths[i];
1385 }
1386 } else if (borderColorStyleCount == 2) {
1387 // with 2 color styles, any extra pixel goes to the outside
1388 for (const auto i : mozilla::AllPhysicalSides()) {
1389 borderWidths[0][i] =
1390 int32_t(mBorderWidths[i]) / 2 + int32_t(mBorderWidths[i]) % 2;
1391 borderWidths[1][i] = int32_t(mBorderWidths[i]) / 2;
1392 }
1393 } else if (borderColorStyleCount == 3) {
1394 // with 3 color styles, any extra pixel (or lack of extra pixel)
1395 // goes to the middle
1396 for (const auto i : mozilla::AllPhysicalSides()) {
1397 if (mBorderWidths[i] == 1.0) {
1398 borderWidths[0][i] = 1.f;
1399 borderWidths[1][i] = borderWidths[2][i] = 0.f;
1400 } else {
1401 int32_t rest = int32_t(mBorderWidths[i]) % 3;
1402 borderWidths[0][i] = borderWidths[2][i] = borderWidths[1][i] =
1403 (int32_t(mBorderWidths[i]) - rest) / 3;
1404
1405 if (rest == 1) {
1406 borderWidths[1][i] += 1.f;
1407 } else if (rest == 2) {
1408 borderWidths[0][i] += 1.f;
1409 borderWidths[2][i] += 1.f;
1410 }
1411 }
1412 }
1413 }
1414
1415 // make a copy that we can modify
1416 RectCornerRadii radii = mBorderRadii;
1417
1418 Rect soRect(mOuterRect);
1419 Rect siRect(mOuterRect);
1420
1421 // If adjacent side is dotted and radius=0, draw side to the end of corner.
1422 //
1423 // +--------------------------------
1424 // |################################
1425 // |
1426 // |################################
1427 // +-----+--------------------------
1428 // | |
1429 // | |
1430 // | |
1431 // | |
1432 // | |
1433 // | ### |
1434 // |#####|
1435 // |#####|
1436 // |#####|
1437 // | ### |
1438 // | |
1439 bool noMarginTop = false;
1440 bool noMarginRight = false;
1441 bool noMarginBottom = false;
1442 bool noMarginLeft = false;
1443
1444 // If there is at least one dotted side, every side is rendered separately.
1445 if (IsSingleSide(aSides)) {
1446 if (aSides == SideBits::eTop) {
1447 if (mBorderStyles[eSideRight] == StyleBorderStyle::Dotted &&
1448 IsZeroSize(mBorderRadii[C_TR])) {
1449 noMarginRight = true;
1450 }
1451 if (mBorderStyles[eSideLeft] == StyleBorderStyle::Dotted &&
1452 IsZeroSize(mBorderRadii[C_TL])) {
1453 noMarginLeft = true;
1454 }
1455 } else if (aSides == SideBits::eRight) {
1456 if (mBorderStyles[eSideTop] == StyleBorderStyle::Dotted &&
1457 IsZeroSize(mBorderRadii[C_TR])) {
1458 noMarginTop = true;
1459 }
1460 if (mBorderStyles[eSideBottom] == StyleBorderStyle::Dotted &&
1461 IsZeroSize(mBorderRadii[C_BR])) {
1462 noMarginBottom = true;
1463 }
1464 } else if (aSides == SideBits::eBottom) {
1465 if (mBorderStyles[eSideRight] == StyleBorderStyle::Dotted &&
1466 IsZeroSize(mBorderRadii[C_BR])) {
1467 noMarginRight = true;
1468 }
1469 if (mBorderStyles[eSideLeft] == StyleBorderStyle::Dotted &&
1470 IsZeroSize(mBorderRadii[C_BL])) {
1471 noMarginLeft = true;
1472 }
1473 } else {
1474 if (mBorderStyles[eSideTop] == StyleBorderStyle::Dotted &&
1475 IsZeroSize(mBorderRadii[C_TL])) {
1476 noMarginTop = true;
1477 }
1478 if (mBorderStyles[eSideBottom] == StyleBorderStyle::Dotted &&
1479 IsZeroSize(mBorderRadii[C_BL])) {
1480 noMarginBottom = true;
1481 }
1482 }
1483 }
1484
1485 for (unsigned int i = 0; i < borderColorStyleCount; i++) {
1486 // walk siRect inwards at the start of the loop to get the
1487 // correct inner rect.
1488 //
1489 // If noMarginTop is false:
1490 // --------------------+
1491 // /|
1492 // / |
1493 // L |
1494 // ----------------+ |
1495 // | |
1496 // | |
1497 //
1498 // If noMarginTop is true:
1499 // ----------------+<--+
1500 // | |
1501 // | |
1502 // | |
1503 // | |
1504 // | |
1505 // | |
1506 siRect.Deflate(Margin(noMarginTop ? 0 : borderWidths[i][0],
1507 noMarginRight ? 0 : borderWidths[i][1],
1508 noMarginBottom ? 0 : borderWidths[i][2],
1509 noMarginLeft ? 0 : borderWidths[i][3]));
1510
1511 if (borderColorStyle[i] != BorderColorStyleNone) {
1512 sRGBColor c = ComputeColorForLine(
1513 i, borderColorStyle, borderColorStyleCount, borderRenderColor);
1514 ColorPattern color(ToDeviceColor(c));
1515
1516 FillSolidBorder(soRect, siRect, radii, borderWidths[i], aSides, color);
1517 }
1518
1519 ComputeInnerRadii(radii, borderWidths[i], &radii);
1520
1521 // And now soRect is the same as siRect, for the next line in.
1522 soRect = siRect;
1523 }
1524 }
1525
SetupDashedOptions(StrokeOptions * aStrokeOptions,Float aDash[2],mozilla::Side aSide,Float aBorderLength,bool isCorner)1526 void nsCSSBorderRenderer::SetupDashedOptions(StrokeOptions* aStrokeOptions,
1527 Float aDash[2],
1528 mozilla::Side aSide,
1529 Float aBorderLength,
1530 bool isCorner) {
1531 MOZ_ASSERT(mBorderStyles[aSide] == StyleBorderStyle::Dashed ||
1532 mBorderStyles[aSide] == StyleBorderStyle::Dotted,
1533 "Style should be dashed or dotted.");
1534
1535 StyleBorderStyle style = mBorderStyles[aSide];
1536 Float borderWidth = mBorderWidths[aSide];
1537
1538 // Dashed line starts and ends with half segment in most case.
1539 //
1540 // __--+---+---+---+---+---+---+---+---+--__
1541 // |###| | |###|###| | |###|
1542 // |###| | |###|###| | |###|
1543 // |###| | |###|###| | |###|
1544 // __--+---+---+---+---+---+---+---+---+--__
1545 //
1546 // If radius=0 and other side is either dotted or 0-width, it starts or ends
1547 // with full segment.
1548 //
1549 // +---+---+---+---+---+---+---+---+---+---+
1550 // |###|###| | |###|###| | |###|###|
1551 // |###|###| | |###|###| | |###|###|
1552 // |###|###| | |###|###| | |###|###|
1553 // +---++--+---+---+---+---+---+---+--++---+
1554 // | | | |
1555 // | | | |
1556 // | | | |
1557 // | | | |
1558 // | ## | | ## |
1559 // |####| |####|
1560 // |####| |####|
1561 // | ## | | ## |
1562 // | | | |
1563 bool fullStart = false, fullEnd = false;
1564 Float halfDash;
1565 if (style == StyleBorderStyle::Dashed) {
1566 // If either end of the side is not connecting onto a corner then we want a
1567 // full dash at that end.
1568 //
1569 // Note that in the case that a corner is empty, either the adjacent side
1570 // has zero width, or else DrawBorders() set the corner to be empty
1571 // (it does that if the adjacent side has zero length and the border widths
1572 // of this and the adjacent sides are thin enough that the corner will be
1573 // insignificantly small).
1574
1575 if (mBorderRadii[GetCCWCorner(aSide)].IsEmpty() &&
1576 (mBorderCornerDimensions[GetCCWCorner(aSide)].IsEmpty() ||
1577 mBorderStyles[PREV_SIDE(aSide)] == StyleBorderStyle::Dotted ||
1578 // XXX why this <=1 check?
1579 borderWidth <= 1.0f)) {
1580 fullStart = true;
1581 }
1582
1583 if (mBorderRadii[GetCWCorner(aSide)].IsEmpty() &&
1584 (mBorderCornerDimensions[GetCWCorner(aSide)].IsEmpty() ||
1585 mBorderStyles[NEXT_SIDE(aSide)] == StyleBorderStyle::Dotted)) {
1586 fullEnd = true;
1587 }
1588
1589 halfDash = borderWidth * DOT_LENGTH * DASH_LENGTH / 2.0f;
1590 } else {
1591 halfDash = borderWidth * DOT_LENGTH / 2.0f;
1592 }
1593
1594 if (style == StyleBorderStyle::Dashed && aBorderLength > 0.0f) {
1595 // The number of half segments, with maximum dash length.
1596 int32_t count = floor(aBorderLength / halfDash);
1597 Float minHalfDash = borderWidth * DOT_LENGTH / 2.0f;
1598
1599 if (fullStart && fullEnd) {
1600 // count should be 4n + 2
1601 //
1602 // 1 + 4 + 4 + 1
1603 //
1604 // | | | | |
1605 // +---+---+---+---+---+---+---+---+---+---+
1606 // |###|###| | |###|###| | |###|###|
1607 // |###|###| | |###|###| | |###|###|
1608 // |###|###| | |###|###| | |###|###|
1609 // +---+---+---+---+---+---+---+---+---+---+
1610
1611 // If border is too short, draw solid line.
1612 if (aBorderLength < 6.0f * minHalfDash) {
1613 return;
1614 }
1615
1616 if (count % 4 == 0) {
1617 count += 2;
1618 } else if (count % 4 == 1) {
1619 count += 1;
1620 } else if (count % 4 == 3) {
1621 count += 3;
1622 }
1623 } else if (fullStart || fullEnd) {
1624 // count should be 4n + 1
1625 //
1626 // 1 + 4 + 4
1627 //
1628 // | | | |
1629 // +---+---+---+---+---+---+---+---+---+
1630 // |###|###| | |###|###| | |###|
1631 // |###|###| | |###|###| | |###|
1632 // |###|###| | |###|###| | |###|
1633 // +---+---+---+---+---+---+---+---+---+
1634 //
1635 // 4 + 4 + 1
1636 //
1637 // | | | |
1638 // +---+---+---+---+---+---+---+---+---+
1639 // |###| | |###|###| | |###|###|
1640 // |###| | |###|###| | |###|###|
1641 // |###| | |###|###| | |###|###|
1642 // +---+---+---+---+---+---+---+---+---+
1643
1644 // If border is too short, draw solid line.
1645 if (aBorderLength < 5.0f * minHalfDash) {
1646 return;
1647 }
1648
1649 if (count % 4 == 0) {
1650 count += 1;
1651 } else if (count % 4 == 2) {
1652 count += 3;
1653 } else if (count % 4 == 3) {
1654 count += 2;
1655 }
1656 } else {
1657 // count should be 4n
1658 //
1659 // 4 + 4
1660 //
1661 // | | |
1662 // +---+---+---+---+---+---+---+---+
1663 // |###| | |###|###| | |###|
1664 // |###| | |###|###| | |###|
1665 // |###| | |###|###| | |###|
1666 // +---+---+---+---+---+---+---+---+
1667
1668 // If border is too short, draw solid line.
1669 if (aBorderLength < 4.0f * minHalfDash) {
1670 return;
1671 }
1672
1673 if (count % 4 == 1) {
1674 count += 3;
1675 } else if (count % 4 == 2) {
1676 count += 2;
1677 } else if (count % 4 == 3) {
1678 count += 1;
1679 }
1680 }
1681 halfDash = aBorderLength / count;
1682 }
1683
1684 Float fullDash = halfDash * 2.0f;
1685
1686 aDash[0] = fullDash;
1687 aDash[1] = fullDash;
1688
1689 if (style == StyleBorderStyle::Dashed && fullDash > 1.0f) {
1690 if (!fullStart) {
1691 // Draw half segments on both ends.
1692 aStrokeOptions->mDashOffset = halfDash;
1693 }
1694 } else if (style != StyleBorderStyle::Dotted && isCorner) {
1695 // If side ends with filled full segment, corner should start with unfilled
1696 // full segment. Not needed for dotted corners, as they overlap one dot with
1697 // the side's end.
1698 //
1699 // corner side
1700 // ------------>|<---------------------------
1701 // |
1702 // __+---+---+---+---+---+---+---+---+
1703 // _+- | |###|###| | |###|###| |
1704 // /##| | |###|###| | |###|###| |
1705 // +####| | |###|###| | |###|###| |
1706 // /#\####| _+--+---+---+---+---+---+---+---+
1707 // |####\##+-
1708 // |#####+-
1709 // +--###/
1710 // | --+
1711 aStrokeOptions->mDashOffset = fullDash;
1712 }
1713
1714 aStrokeOptions->mDashPattern = aDash;
1715 aStrokeOptions->mDashLength = 2;
1716
1717 PrintAsFormatString("dash: %f %f\n", aDash[0], aDash[1]);
1718 }
1719
GetBorderLength(mozilla::Side aSide,const Point & aStart,const Point & aEnd)1720 static Float GetBorderLength(mozilla::Side aSide, const Point& aStart,
1721 const Point& aEnd) {
1722 if (aSide == eSideTop) {
1723 return aEnd.x - aStart.x;
1724 }
1725 if (aSide == eSideRight) {
1726 return aEnd.y - aStart.y;
1727 }
1728 if (aSide == eSideBottom) {
1729 return aStart.x - aEnd.x;
1730 }
1731 return aStart.y - aEnd.y;
1732 }
1733
DrawDashedOrDottedSide(mozilla::Side aSide)1734 void nsCSSBorderRenderer::DrawDashedOrDottedSide(mozilla::Side aSide) {
1735 // Draw dashed/dotted side with following approach.
1736 //
1737 // dashed side
1738 // Draw dashed line along the side, with appropriate dash length and gap
1739 // to make the side symmetric as far as possible. Dash length equals to
1740 // the gap, and the ratio of the dash length to border-width is the maximum
1741 // value in in [1, 3] range.
1742 // In most case, line ends with half segment, to joint with corner easily.
1743 // If adjacent side is dotted or 0px and border-radius for the corner
1744 // between them is 0, the line ends with full segment.
1745 // (see comment for GetStraightBorderPoint for more detail)
1746 //
1747 // dotted side
1748 // If border-width <= 2.0, draw 1:1 dashed line.
1749 // Otherwise, draw circles along the side, with appropriate gap that makes
1750 // the side symmetric as far as possible. The ratio of the gap to
1751 // border-width is the maximum value in [0.5, 1] range in most case.
1752 // if the side is too short and there's only 2 dots, it can be more smaller.
1753 // If there's no space to place 2 dots at the side, draw single dot at the
1754 // middle of the side.
1755 // In most case, line ends with filled dot, to joint with corner easily,
1756 // If adjacent side is dotted with larger border-width, or other style,
1757 // the line ends with unfilled dot.
1758 // (see comment for GetStraightBorderPoint for more detail)
1759
1760 NS_ASSERTION(mBorderStyles[aSide] == StyleBorderStyle::Dashed ||
1761 mBorderStyles[aSide] == StyleBorderStyle::Dotted,
1762 "Style should be dashed or dotted.");
1763
1764 Float borderWidth = mBorderWidths[aSide];
1765 if (borderWidth == 0.0f) {
1766 return;
1767 }
1768
1769 if (mBorderStyles[aSide] == StyleBorderStyle::Dotted && borderWidth > 2.0f) {
1770 DrawDottedSideSlow(aSide);
1771 return;
1772 }
1773
1774 nscolor borderColor = mBorderColors[aSide];
1775 bool ignored;
1776 // Get the start and end points of the side, ensuring that any dot origins get
1777 // pushed outward to account for stroking.
1778 Point start =
1779 GetStraightBorderPoint(aSide, GetCCWCorner(aSide), &ignored, 0.5f);
1780 Point end = GetStraightBorderPoint(aSide, GetCWCorner(aSide), &ignored, 0.5f);
1781 if (borderWidth < 2.0f) {
1782 // Round start to draw dot on each pixel.
1783 if (IsHorizontalSide(aSide)) {
1784 start.x = round(start.x);
1785 } else {
1786 start.y = round(start.y);
1787 }
1788 }
1789
1790 Float borderLength = GetBorderLength(aSide, start, end);
1791 if (borderLength < 0.0f) {
1792 return;
1793 }
1794
1795 StrokeOptions strokeOptions(borderWidth);
1796 Float dash[2];
1797 SetupDashedOptions(&strokeOptions, dash, aSide, borderLength, false);
1798
1799 // For dotted sides that can merge with their prior dotted sides, advance the
1800 // dash offset to measure the distance around the combined path. This prevents
1801 // two dots from bunching together at a corner.
1802 mozilla::Side mergeSide = aSide;
1803 while (IsCornerMergeable(GetCCWCorner(mergeSide))) {
1804 mergeSide = PREV_SIDE(mergeSide);
1805 // If we looped all the way around, measure starting at the top side, since
1806 // we need to pick a fixed location to start measuring distance from still.
1807 if (mergeSide == aSide) {
1808 mergeSide = eSideTop;
1809 break;
1810 }
1811 }
1812 while (mergeSide != aSide) {
1813 // Measure the length of the merged side starting from a possibly
1814 // unmergeable corner up to the merged corner. A merged corner effectively
1815 // has no border radius, so we can just use the cheaper AtCorner to find the
1816 // end point.
1817 Float mergeLength =
1818 GetBorderLength(mergeSide,
1819 GetStraightBorderPoint(
1820 mergeSide, GetCCWCorner(mergeSide), &ignored, 0.5f),
1821 mOuterRect.AtCorner(GetCWCorner(mergeSide)));
1822 // Add in the merged side length. Also offset the dash progress by an extra
1823 // dot's width to avoid drawing a dot that would overdraw where the merged
1824 // side would have ended in a gap, i.e. O_O_
1825 // O
1826 strokeOptions.mDashOffset += mergeLength + borderWidth;
1827 mergeSide = NEXT_SIDE(mergeSide);
1828 }
1829
1830 DrawOptions drawOptions;
1831 if (mBorderStyles[aSide] == StyleBorderStyle::Dotted) {
1832 drawOptions.mAntialiasMode = AntialiasMode::NONE;
1833 }
1834
1835 mDrawTarget->StrokeLine(start, end, ColorPattern(ToDeviceColor(borderColor)),
1836 strokeOptions, drawOptions);
1837 }
1838
DrawDottedSideSlow(mozilla::Side aSide)1839 void nsCSSBorderRenderer::DrawDottedSideSlow(mozilla::Side aSide) {
1840 // Draw each circles separately for dotted with borderWidth > 2.0.
1841 // Dashed line with CapStyle::ROUND doesn't render perfect circles.
1842
1843 NS_ASSERTION(mBorderStyles[aSide] == StyleBorderStyle::Dotted,
1844 "Style should be dotted.");
1845
1846 Float borderWidth = mBorderWidths[aSide];
1847 if (borderWidth == 0.0f) {
1848 return;
1849 }
1850
1851 nscolor borderColor = mBorderColors[aSide];
1852 bool isStartUnfilled, isEndUnfilled;
1853 Point start =
1854 GetStraightBorderPoint(aSide, GetCCWCorner(aSide), &isStartUnfilled);
1855 Point end = GetStraightBorderPoint(aSide, GetCWCorner(aSide), &isEndUnfilled);
1856 enum {
1857 // Corner is not mergeable.
1858 NO_MERGE,
1859
1860 // Corner between different colors.
1861 // Two dots are merged into one, and both side draw half dot.
1862 MERGE_HALF,
1863
1864 // Corner between same colors, CCW corner of the side.
1865 // Two dots are merged into one, and this side draw entire dot.
1866 //
1867 // MERGE_ALL MERGE_NONE
1868 // | |
1869 // v v
1870 // +-----------------------+----+
1871 // | ## ## ## | ## |
1872 // |#### #### #### |####|
1873 // |#### #### #### |####|
1874 // | ## ## ## | ## |
1875 // +----+------------------+ |
1876 // | | | |
1877 // | | | |
1878 // | | | |
1879 // | ## | | ## |
1880 // |####| |####|
1881 MERGE_ALL,
1882
1883 // Corner between same colors, CW corner of the side.
1884 // Two dots are merged into one, and this side doesn't draw dot.
1885 MERGE_NONE
1886 } mergeStart = NO_MERGE,
1887 mergeEnd = NO_MERGE;
1888
1889 if (IsCornerMergeable(GetCCWCorner(aSide))) {
1890 if (borderColor == mBorderColors[PREV_SIDE(aSide)]) {
1891 mergeStart = MERGE_ALL;
1892 } else {
1893 mergeStart = MERGE_HALF;
1894 }
1895 }
1896
1897 if (IsCornerMergeable(GetCWCorner(aSide))) {
1898 if (borderColor == mBorderColors[NEXT_SIDE(aSide)]) {
1899 mergeEnd = MERGE_NONE;
1900 } else {
1901 mergeEnd = MERGE_HALF;
1902 }
1903 }
1904
1905 Float borderLength = GetBorderLength(aSide, start, end);
1906 if (borderLength < 0.0f) {
1907 if (isStartUnfilled || isEndUnfilled) {
1908 return;
1909 }
1910 borderLength = 0.0f;
1911 start = end = (start + end) / 2.0f;
1912 }
1913
1914 Float dotWidth = borderWidth * DOT_LENGTH;
1915 Float radius = borderWidth / 2.0f;
1916 if (borderLength < dotWidth) {
1917 // If dots on start and end may overlap, draw a dot at the middle of them.
1918 //
1919 // ___---+-------+---___
1920 // __-- | ##### | --__
1921 // #|#######|#
1922 // ##|#######|##
1923 // ###|#######|###
1924 // ###+###+###+###
1925 // start ## end #
1926 // ##|#######|##
1927 // #|#######|#
1928 // | ##### |
1929 // __--+-------+--__
1930 // _- -_
1931 //
1932 // If that circle overflows from outer rect, do not draw it.
1933 //
1934 // +-------+
1935 // | ##### |
1936 // #|#######|#
1937 // ##|#######|##
1938 // ###|#######|###
1939 // ###|###+###|###
1940 // ###|#######|###
1941 // ##|#######|##
1942 // #|#######|#
1943 // | ##### |
1944 // +--+-+--+
1945 // | | | |
1946 // | | | |
1947 if (!mOuterRect.Contains(Rect(start.x - radius, start.y - radius,
1948 borderWidth, borderWidth))) {
1949 return;
1950 }
1951
1952 if (isStartUnfilled || isEndUnfilled) {
1953 return;
1954 }
1955
1956 Point P = (start + end) / 2;
1957 RefPtr<PathBuilder> builder = mDrawTarget->CreatePathBuilder();
1958 builder->MoveTo(Point(P.x + radius, P.y));
1959 builder->Arc(P, radius, 0.0f, Float(2.0 * M_PI));
1960 RefPtr<Path> path = builder->Finish();
1961 mDrawTarget->Fill(path, ColorPattern(ToDeviceColor(borderColor)));
1962 return;
1963 }
1964
1965 if (mergeStart == MERGE_HALF || mergeEnd == MERGE_HALF) {
1966 // MERGE_HALF
1967 // Eo
1968 // -------+----+
1969 // ##### /
1970 // ######/
1971 // ######/
1972 // ####+
1973 // ##/ end
1974 // /
1975 // /
1976 // --+
1977 // Ei
1978 //
1979 // other (NO_MERGE, MERGE_ALL, MERGE_NONE)
1980 // Eo
1981 // ------------+
1982 // ##### |
1983 // ####### |
1984 // #########|
1985 // ####+####|
1986 // ## end ##|
1987 // ####### |
1988 // ##### |
1989 // ------------+
1990 // Ei
1991
1992 Point I(0.0f, 0.0f), J(0.0f, 0.0f);
1993 if (aSide == eSideTop) {
1994 I.x = 1.0f;
1995 J.y = 1.0f;
1996 } else if (aSide == eSideRight) {
1997 I.y = 1.0f;
1998 J.x = -1.0f;
1999 } else if (aSide == eSideBottom) {
2000 I.x = -1.0f;
2001 J.y = -1.0f;
2002 } else if (aSide == eSideLeft) {
2003 I.y = -1.0f;
2004 J.x = 1.0f;
2005 }
2006
2007 Point So, Si, Eo, Ei;
2008
2009 So = (start + (-I + -J) * borderWidth / 2.0f);
2010 Si = (mergeStart == MERGE_HALF) ? (start + (I + J) * borderWidth / 2.0f)
2011 : (start + (-I + J) * borderWidth / 2.0f);
2012 Eo = (end + (I - J) * borderWidth / 2.0f);
2013 Ei = (mergeEnd == MERGE_HALF) ? (end + (-I + J) * borderWidth / 2.0f)
2014 : (end + (I + J) * borderWidth / 2.0f);
2015
2016 RefPtr<PathBuilder> builder = mDrawTarget->CreatePathBuilder();
2017 builder->MoveTo(So);
2018 builder->LineTo(Eo);
2019 builder->LineTo(Ei);
2020 builder->LineTo(Si);
2021 builder->Close();
2022 RefPtr<Path> path = builder->Finish();
2023
2024 mDrawTarget->PushClip(path);
2025 }
2026
2027 size_t count = round(borderLength / dotWidth);
2028 if (isStartUnfilled == isEndUnfilled) {
2029 // Split into 2n segments.
2030 if (count % 2) {
2031 count++;
2032 }
2033 } else {
2034 // Split into 2n+1 segments.
2035 if (count % 2 == 0) {
2036 count++;
2037 }
2038 }
2039
2040 // A: radius == borderWidth / 2.0
2041 // B: borderLength / count == borderWidth * (1 - overlap)
2042 //
2043 // A B B B B A
2044 // |<-->|<------>|<------>|<------>|<------>|<-->|
2045 // | | | | | | |
2046 // +----+--------+--------+--------+--------+----+
2047 // | ##|## **|** ##|## **|** ##|## |
2048 // | ###|### ***|*** ###|### ***|*** ###|### |
2049 // |####|####****|****####|####****|****####|####|
2050 // |####+####****+****####+####****+****####+####|
2051 // |# start #****|****####|####****|****## end ##|
2052 // | ###|### ***|*** ###|### ***|*** ###|### |
2053 // | ##|## **|** ##|## **|** ##|## |
2054 // +----+----+---+--------+--------+---+----+----+
2055 // | | | |
2056 // | | | |
2057
2058 // If isStartUnfilled is true, draw dots on 2j+1 points, if not, draw dots on
2059 // 2j points.
2060 size_t from = isStartUnfilled ? 1 : 0;
2061
2062 // If mergeEnd == MERGE_NONE, last dot is drawn by next side.
2063 size_t to = count;
2064 if (mergeEnd == MERGE_NONE) {
2065 if (to > 2) {
2066 to -= 2;
2067 } else {
2068 to = 0;
2069 }
2070 }
2071
2072 Point fromP = (start * (count - from) + end * from) / count;
2073 Point toP = (start * (count - to) + end * to) / count;
2074 // Extend dirty rect to avoid clipping pixel for anti-aliasing.
2075 const Float AA_MARGIN = 2.0f;
2076
2077 if (aSide == eSideTop) {
2078 // Tweak |from| and |to| to fit into |mDirtyRect + radius margin|,
2079 // to render only paths that may overlap mDirtyRect.
2080 //
2081 // mDirtyRect + radius margin
2082 // +--+---------------------+--+
2083 // | |
2084 // | mDirtyRect |
2085 // + +---------------------+ +
2086 // from ===> |from to | <=== to
2087 // +-----+-----+-----+-----+-----+-----+-----+-----+
2088 // ### |### ### ###| ###
2089 // ##### ##### ##### ##### #####
2090 // ##### ##### ##### ##### #####
2091 // ##### ##### ##### ##### #####
2092 // ### |### ### ###| ###
2093 // | | | |
2094 // + +---------------------+ +
2095 // | |
2096 // | |
2097 // +--+---------------------+--+
2098
2099 Float left = mDirtyRect.x - radius - AA_MARGIN;
2100 if (fromP.x < left) {
2101 size_t tmp = ceil(count * (left - start.x) / (end.x - start.x));
2102 if (tmp > from) {
2103 // We increment by 2, so odd/even should match between before/after.
2104 if ((tmp & 1) != (from & 1)) {
2105 from = tmp - 1;
2106 } else {
2107 from = tmp;
2108 }
2109 }
2110 }
2111 Float right = mDirtyRect.x + mDirtyRect.width + radius + AA_MARGIN;
2112 if (toP.x > right) {
2113 size_t tmp = floor(count * (right - start.x) / (end.x - start.x));
2114 if (tmp < to) {
2115 if ((tmp & 1) != (to & 1)) {
2116 to = tmp + 1;
2117 } else {
2118 to = tmp;
2119 }
2120 }
2121 }
2122 } else if (aSide == eSideRight) {
2123 Float top = mDirtyRect.y - radius - AA_MARGIN;
2124 if (fromP.y < top) {
2125 size_t tmp = ceil(count * (top - start.y) / (end.y - start.y));
2126 if (tmp > from) {
2127 if ((tmp & 1) != (from & 1)) {
2128 from = tmp - 1;
2129 } else {
2130 from = tmp;
2131 }
2132 }
2133 }
2134 Float bottom = mDirtyRect.y + mDirtyRect.height + radius + AA_MARGIN;
2135 if (toP.y > bottom) {
2136 size_t tmp = floor(count * (bottom - start.y) / (end.y - start.y));
2137 if (tmp < to) {
2138 if ((tmp & 1) != (to & 1)) {
2139 to = tmp + 1;
2140 } else {
2141 to = tmp;
2142 }
2143 }
2144 }
2145 } else if (aSide == eSideBottom) {
2146 Float right = mDirtyRect.x + mDirtyRect.width + radius + AA_MARGIN;
2147 if (fromP.x > right) {
2148 size_t tmp = ceil(count * (right - start.x) / (end.x - start.x));
2149 if (tmp > from) {
2150 if ((tmp & 1) != (from & 1)) {
2151 from = tmp - 1;
2152 } else {
2153 from = tmp;
2154 }
2155 }
2156 }
2157 Float left = mDirtyRect.x - radius - AA_MARGIN;
2158 if (toP.x < left) {
2159 size_t tmp = floor(count * (left - start.x) / (end.x - start.x));
2160 if (tmp < to) {
2161 if ((tmp & 1) != (to & 1)) {
2162 to = tmp + 1;
2163 } else {
2164 to = tmp;
2165 }
2166 }
2167 }
2168 } else if (aSide == eSideLeft) {
2169 Float bottom = mDirtyRect.y + mDirtyRect.height + radius + AA_MARGIN;
2170 if (fromP.y > bottom) {
2171 size_t tmp = ceil(count * (bottom - start.y) / (end.y - start.y));
2172 if (tmp > from) {
2173 if ((tmp & 1) != (from & 1)) {
2174 from = tmp - 1;
2175 } else {
2176 from = tmp;
2177 }
2178 }
2179 }
2180 Float top = mDirtyRect.y - radius - AA_MARGIN;
2181 if (toP.y < top) {
2182 size_t tmp = floor(count * (top - start.y) / (end.y - start.y));
2183 if (tmp < to) {
2184 if ((tmp & 1) != (to & 1)) {
2185 to = tmp + 1;
2186 } else {
2187 to = tmp;
2188 }
2189 }
2190 }
2191 }
2192
2193 RefPtr<PathBuilder> builder = mDrawTarget->CreatePathBuilder();
2194 size_t segmentCount = 0;
2195 for (size_t i = from; i <= to; i += 2) {
2196 if (segmentCount > BORDER_SEGMENT_COUNT_MAX) {
2197 RefPtr<Path> path = builder->Finish();
2198 mDrawTarget->Fill(path, ColorPattern(ToDeviceColor(borderColor)));
2199 builder = mDrawTarget->CreatePathBuilder();
2200 segmentCount = 0;
2201 }
2202
2203 Point P = (start * (count - i) + end * i) / count;
2204 builder->MoveTo(Point(P.x + radius, P.y));
2205 builder->Arc(P, radius, 0.0f, Float(2.0 * M_PI));
2206 segmentCount++;
2207 }
2208 RefPtr<Path> path = builder->Finish();
2209 mDrawTarget->Fill(path, ColorPattern(ToDeviceColor(borderColor)));
2210
2211 if (mergeStart == MERGE_HALF || mergeEnd == MERGE_HALF) {
2212 mDrawTarget->PopClip();
2213 }
2214 }
2215
DrawDashedOrDottedCorner(mozilla::Side aSide,Corner aCorner)2216 void nsCSSBorderRenderer::DrawDashedOrDottedCorner(mozilla::Side aSide,
2217 Corner aCorner) {
2218 // Draw dashed/dotted corner with following approach.
2219 //
2220 // dashed corner
2221 // If both side has same border-width and border-width <= 2.0, draw dashed
2222 // line along the corner, with appropriate dash length and gap to make the
2223 // corner symmetric as far as possible. Dash length equals to the gap, and
2224 // the ratio of the dash length to border-width is the maximum value in in
2225 // [1, 3] range.
2226 // Otherwise, draw dashed segments along the corner, keeping same dash
2227 // length ratio to border-width at that point.
2228 // (see DashedCornerFinder.h for more detail)
2229 // Line ends with half segments, to joint with both side easily.
2230 //
2231 // dotted corner
2232 // If both side has same border-width and border-width <= 2.0, draw 1:1
2233 // dashed line along the corner.
2234 // Otherwise Draw circles along the corner, with appropriate gap that makes
2235 // the corner symmetric as far as possible. The size of the circle may
2236 // change along the corner, that is tangent to the outer curver and the
2237 // inner curve. The ratio of the gap to circle diameter is the maximum
2238 // value in [0.5, 1] range.
2239 // (see DottedCornerFinder.h for more detail)
2240 // Corner ends with filled dots but those dots are drawn by
2241 // DrawDashedOrDottedSide. So this may draw no circles if there's no space
2242 // between 2 dots at both ends.
2243
2244 NS_ASSERTION(mBorderStyles[aSide] == StyleBorderStyle::Dashed ||
2245 mBorderStyles[aSide] == StyleBorderStyle::Dotted,
2246 "Style should be dashed or dotted.");
2247
2248 if (IsCornerMergeable(aCorner)) {
2249 // DrawDashedOrDottedSide will draw corner.
2250 return;
2251 }
2252
2253 mozilla::Side sideH(GetHorizontalSide(aCorner));
2254 mozilla::Side sideV(GetVerticalSide(aCorner));
2255 Float borderWidthH = mBorderWidths[sideH];
2256 Float borderWidthV = mBorderWidths[sideV];
2257 if (borderWidthH == 0.0f && borderWidthV == 0.0f) {
2258 return;
2259 }
2260
2261 StyleBorderStyle styleH = mBorderStyles[sideH];
2262 StyleBorderStyle styleV = mBorderStyles[sideV];
2263
2264 // Corner between dotted and others with radius=0 is drawn by side.
2265 if (IsZeroSize(mBorderRadii[aCorner]) &&
2266 (styleV == StyleBorderStyle::Dotted ||
2267 styleH == StyleBorderStyle::Dotted)) {
2268 return;
2269 }
2270
2271 Float maxRadius =
2272 std::max(mBorderRadii[aCorner].width, mBorderRadii[aCorner].height);
2273 if (maxRadius > BORDER_DOTTED_CORNER_MAX_RADIUS) {
2274 DrawFallbackSolidCorner(aSide, aCorner);
2275 return;
2276 }
2277
2278 if (borderWidthH != borderWidthV || borderWidthH > 2.0f) {
2279 StyleBorderStyle style = mBorderStyles[aSide];
2280 if (style == StyleBorderStyle::Dotted) {
2281 DrawDottedCornerSlow(aSide, aCorner);
2282 } else {
2283 DrawDashedCornerSlow(aSide, aCorner);
2284 }
2285 return;
2286 }
2287
2288 nscolor borderColor = mBorderColors[aSide];
2289 Point points[4];
2290 bool ignored;
2291 // Get the start and end points of the corner arc, ensuring that any dot
2292 // origins get pushed backwards towards the edges of the corner rect to
2293 // account for stroking.
2294 points[0] = GetStraightBorderPoint(sideH, aCorner, &ignored, -0.5f);
2295 points[3] = GetStraightBorderPoint(sideV, aCorner, &ignored, -0.5f);
2296 // Round points to draw dot on each pixel.
2297 if (borderWidthH < 2.0f) {
2298 points[0].x = round(points[0].x);
2299 }
2300 if (borderWidthV < 2.0f) {
2301 points[3].y = round(points[3].y);
2302 }
2303 points[1] = points[0];
2304 points[1].x += kKappaFactor * (points[3].x - points[0].x);
2305 points[2] = points[3];
2306 points[2].y += kKappaFactor * (points[0].y - points[3].y);
2307
2308 Float len = GetQuarterEllipticArcLength(fabs(points[0].x - points[3].x),
2309 fabs(points[0].y - points[3].y));
2310
2311 Float dash[2];
2312 StrokeOptions strokeOptions(borderWidthH);
2313 SetupDashedOptions(&strokeOptions, dash, aSide, len, true);
2314
2315 RefPtr<PathBuilder> builder = mDrawTarget->CreatePathBuilder();
2316 builder->MoveTo(points[0]);
2317 builder->BezierTo(points[1], points[2], points[3]);
2318 RefPtr<Path> path = builder->Finish();
2319 mDrawTarget->Stroke(path, ColorPattern(ToDeviceColor(borderColor)),
2320 strokeOptions);
2321 }
2322
DrawDottedCornerSlow(mozilla::Side aSide,Corner aCorner)2323 void nsCSSBorderRenderer::DrawDottedCornerSlow(mozilla::Side aSide,
2324 Corner aCorner) {
2325 NS_ASSERTION(mBorderStyles[aSide] == StyleBorderStyle::Dotted,
2326 "Style should be dotted.");
2327
2328 mozilla::Side sideH(GetHorizontalSide(aCorner));
2329 mozilla::Side sideV(GetVerticalSide(aCorner));
2330 Float R0 = mBorderWidths[sideH] / 2.0f;
2331 Float Rn = mBorderWidths[sideV] / 2.0f;
2332 if (R0 == 0.0f && Rn == 0.0f) {
2333 return;
2334 }
2335
2336 nscolor borderColor = mBorderColors[aSide];
2337 Bezier outerBezier;
2338 Bezier innerBezier;
2339 GetOuterAndInnerBezier(&outerBezier, &innerBezier, aCorner);
2340
2341 bool ignored;
2342 Point C0 = GetStraightBorderPoint(sideH, aCorner, &ignored);
2343 Point Cn = GetStraightBorderPoint(sideV, aCorner, &ignored);
2344 DottedCornerFinder finder(outerBezier, innerBezier, aCorner,
2345 mBorderRadii[aCorner].width,
2346 mBorderRadii[aCorner].height, C0, R0, Cn, Rn,
2347 mBorderCornerDimensions[aCorner]);
2348
2349 RefPtr<PathBuilder> builder = mDrawTarget->CreatePathBuilder();
2350 size_t segmentCount = 0;
2351 const Float AA_MARGIN = 2.0f;
2352 Rect marginedDirtyRect = mDirtyRect;
2353 marginedDirtyRect.Inflate(std::max(R0, Rn) + AA_MARGIN);
2354 bool entered = false;
2355 while (finder.HasMore()) {
2356 if (segmentCount > BORDER_SEGMENT_COUNT_MAX) {
2357 RefPtr<Path> path = builder->Finish();
2358 mDrawTarget->Fill(path, ColorPattern(ToDeviceColor(borderColor)));
2359 builder = mDrawTarget->CreatePathBuilder();
2360 segmentCount = 0;
2361 }
2362
2363 DottedCornerFinder::Result result = finder.Next();
2364
2365 if (marginedDirtyRect.Contains(result.C) && result.r > 0) {
2366 entered = true;
2367 builder->MoveTo(Point(result.C.x + result.r, result.C.y));
2368 builder->Arc(result.C, result.r, 0, Float(2.0 * M_PI));
2369 segmentCount++;
2370 } else if (entered) {
2371 break;
2372 }
2373 }
2374 RefPtr<Path> path = builder->Finish();
2375 mDrawTarget->Fill(path, ColorPattern(ToDeviceColor(borderColor)));
2376 }
2377
DashedPathOverlapsRect(Rect & pathRect,const Rect & marginedDirtyRect,DashedCornerFinder::Result & result)2378 static inline bool DashedPathOverlapsRect(Rect& pathRect,
2379 const Rect& marginedDirtyRect,
2380 DashedCornerFinder::Result& result) {
2381 // Calculate a rect that contains all control points of the |result| path,
2382 // and check if it intersects with |marginedDirtyRect|.
2383 pathRect.SetRect(result.outerSectionBezier.mPoints[0].x,
2384 result.outerSectionBezier.mPoints[0].y, 0, 0);
2385 pathRect.ExpandToEnclose(result.outerSectionBezier.mPoints[1]);
2386 pathRect.ExpandToEnclose(result.outerSectionBezier.mPoints[2]);
2387 pathRect.ExpandToEnclose(result.outerSectionBezier.mPoints[3]);
2388 pathRect.ExpandToEnclose(result.innerSectionBezier.mPoints[0]);
2389 pathRect.ExpandToEnclose(result.innerSectionBezier.mPoints[1]);
2390 pathRect.ExpandToEnclose(result.innerSectionBezier.mPoints[2]);
2391 pathRect.ExpandToEnclose(result.innerSectionBezier.mPoints[3]);
2392
2393 return pathRect.Intersects(marginedDirtyRect);
2394 }
2395
DrawDashedCornerSlow(mozilla::Side aSide,Corner aCorner)2396 void nsCSSBorderRenderer::DrawDashedCornerSlow(mozilla::Side aSide,
2397 Corner aCorner) {
2398 NS_ASSERTION(mBorderStyles[aSide] == StyleBorderStyle::Dashed,
2399 "Style should be dashed.");
2400
2401 mozilla::Side sideH(GetHorizontalSide(aCorner));
2402 mozilla::Side sideV(GetVerticalSide(aCorner));
2403 Float borderWidthH = mBorderWidths[sideH];
2404 Float borderWidthV = mBorderWidths[sideV];
2405 if (borderWidthH == 0.0f && borderWidthV == 0.0f) {
2406 return;
2407 }
2408
2409 nscolor borderColor = mBorderColors[aSide];
2410 Bezier outerBezier;
2411 Bezier innerBezier;
2412 GetOuterAndInnerBezier(&outerBezier, &innerBezier, aCorner);
2413
2414 DashedCornerFinder finder(outerBezier, innerBezier, borderWidthH,
2415 borderWidthV, mBorderCornerDimensions[aCorner]);
2416
2417 RefPtr<PathBuilder> builder = mDrawTarget->CreatePathBuilder();
2418 size_t segmentCount = 0;
2419 const Float AA_MARGIN = 2.0f;
2420 Rect marginedDirtyRect = mDirtyRect;
2421 marginedDirtyRect.Inflate(AA_MARGIN);
2422 Rect pathRect;
2423 bool entered = false;
2424 while (finder.HasMore()) {
2425 if (segmentCount > BORDER_SEGMENT_COUNT_MAX) {
2426 RefPtr<Path> path = builder->Finish();
2427 mDrawTarget->Fill(path, ColorPattern(ToDeviceColor(borderColor)));
2428 builder = mDrawTarget->CreatePathBuilder();
2429 segmentCount = 0;
2430 }
2431
2432 DashedCornerFinder::Result result = finder.Next();
2433
2434 if (DashedPathOverlapsRect(pathRect, marginedDirtyRect, result)) {
2435 entered = true;
2436 builder->MoveTo(result.outerSectionBezier.mPoints[0]);
2437 builder->BezierTo(result.outerSectionBezier.mPoints[1],
2438 result.outerSectionBezier.mPoints[2],
2439 result.outerSectionBezier.mPoints[3]);
2440 builder->LineTo(result.innerSectionBezier.mPoints[3]);
2441 builder->BezierTo(result.innerSectionBezier.mPoints[2],
2442 result.innerSectionBezier.mPoints[1],
2443 result.innerSectionBezier.mPoints[0]);
2444 builder->LineTo(result.outerSectionBezier.mPoints[0]);
2445 segmentCount++;
2446 } else if (entered) {
2447 break;
2448 }
2449 }
2450
2451 if (outerBezier.mPoints[0].x != innerBezier.mPoints[0].x) {
2452 // Fill gap before the first section.
2453 //
2454 // outnerPoint[0]
2455 // |
2456 // v
2457 // _+-----------+--
2458 // / \##########|
2459 // / \#########|
2460 // + \########|
2461 // |\ \######|
2462 // | \ \#####|
2463 // | \ \####|
2464 // | \ \##|
2465 // | \ \#|
2466 // | \ \|
2467 // | \ _-+--
2468 // +--------------+ ^
2469 // | | |
2470 // | | innerPoint[0]
2471 // | |
2472 builder->MoveTo(outerBezier.mPoints[0]);
2473 builder->LineTo(innerBezier.mPoints[0]);
2474 builder->LineTo(Point(innerBezier.mPoints[0].x, outerBezier.mPoints[0].y));
2475 builder->LineTo(outerBezier.mPoints[0]);
2476 }
2477
2478 if (outerBezier.mPoints[3].y != innerBezier.mPoints[3].y) {
2479 // Fill gap after the last section.
2480 //
2481 // outnerPoint[3]
2482 // |
2483 // |
2484 // | _+-----------+--
2485 // | / \ |
2486 // v/ \ |
2487 // + \ |
2488 // |\ \ |
2489 // |##\ \ |
2490 // |####\ \ |
2491 // |######\ \ |
2492 // |########\ \ |
2493 // |##########\ \|
2494 // |############\ _-+--
2495 // +--------------+<-- innerPoint[3]
2496 // | |
2497 // | |
2498 // | |
2499 builder->MoveTo(outerBezier.mPoints[3]);
2500 builder->LineTo(innerBezier.mPoints[3]);
2501 builder->LineTo(Point(outerBezier.mPoints[3].x, innerBezier.mPoints[3].y));
2502 builder->LineTo(outerBezier.mPoints[3]);
2503 }
2504
2505 RefPtr<Path> path = builder->Finish();
2506 mDrawTarget->Fill(path, ColorPattern(ToDeviceColor(borderColor)));
2507 }
2508
DrawFallbackSolidCorner(mozilla::Side aSide,Corner aCorner)2509 void nsCSSBorderRenderer::DrawFallbackSolidCorner(mozilla::Side aSide,
2510 Corner aCorner) {
2511 // Render too large dashed or dotted corner with solid style, to avoid hangup
2512 // inside DashedCornerFinder and DottedCornerFinder.
2513
2514 NS_ASSERTION(mBorderStyles[aSide] == StyleBorderStyle::Dashed ||
2515 mBorderStyles[aSide] == StyleBorderStyle::Dotted,
2516 "Style should be dashed or dotted.");
2517
2518 nscolor borderColor = mBorderColors[aSide];
2519 Bezier outerBezier;
2520 Bezier innerBezier;
2521 GetOuterAndInnerBezier(&outerBezier, &innerBezier, aCorner);
2522
2523 RefPtr<PathBuilder> builder = mDrawTarget->CreatePathBuilder();
2524
2525 builder->MoveTo(outerBezier.mPoints[0]);
2526 builder->BezierTo(outerBezier.mPoints[1], outerBezier.mPoints[2],
2527 outerBezier.mPoints[3]);
2528 builder->LineTo(innerBezier.mPoints[3]);
2529 builder->BezierTo(innerBezier.mPoints[2], innerBezier.mPoints[1],
2530 innerBezier.mPoints[0]);
2531 builder->LineTo(outerBezier.mPoints[0]);
2532
2533 RefPtr<Path> path = builder->Finish();
2534 mDrawTarget->Fill(path, ColorPattern(ToDeviceColor(borderColor)));
2535
2536 if (!mPresContext->HasWarnedAboutTooLargeDashedOrDottedRadius()) {
2537 mPresContext->SetHasWarnedAboutTooLargeDashedOrDottedRadius();
2538 nsContentUtils::ReportToConsole(
2539 nsIScriptError::warningFlag, "CSS"_ns, mPresContext->Document(),
2540 nsContentUtils::eCSS_PROPERTIES,
2541 mBorderStyles[aSide] == StyleBorderStyle::Dashed
2542 ? "TooLargeDashedRadius"
2543 : "TooLargeDottedRadius");
2544 }
2545 }
2546
AllBordersSameWidth()2547 bool nsCSSBorderRenderer::AllBordersSameWidth() {
2548 if (mBorderWidths[0] == mBorderWidths[1] &&
2549 mBorderWidths[0] == mBorderWidths[2] &&
2550 mBorderWidths[0] == mBorderWidths[3]) {
2551 return true;
2552 }
2553
2554 return false;
2555 }
2556
AllBordersSolid()2557 bool nsCSSBorderRenderer::AllBordersSolid() {
2558 for (const auto i : mozilla::AllPhysicalSides()) {
2559 if (mBorderStyles[i] == StyleBorderStyle::Solid ||
2560 mBorderStyles[i] == StyleBorderStyle::None ||
2561 mBorderStyles[i] == StyleBorderStyle::Hidden) {
2562 continue;
2563 }
2564 return false;
2565 }
2566
2567 return true;
2568 }
2569
IsVisible(StyleBorderStyle aStyle)2570 static bool IsVisible(StyleBorderStyle aStyle) {
2571 if (aStyle != StyleBorderStyle::None && aStyle != StyleBorderStyle::Hidden) {
2572 return true;
2573 }
2574 return false;
2575 }
2576
2577 struct twoFloats {
2578 Float a, b;
2579
operator *twoFloats2580 twoFloats operator*(const Size& aSize) const {
2581 return {a * aSize.width, b * aSize.height};
2582 }
2583
operator *twoFloats2584 twoFloats operator*(Float aScale) const { return {a * aScale, b * aScale}; }
2585
operator +twoFloats2586 twoFloats operator+(const Point& aPoint) const {
2587 return {a + aPoint.x, b + aPoint.y};
2588 }
2589
operator PointtwoFloats2590 operator Point() const { return Point(a, b); }
2591 };
2592
DrawSingleWidthSolidBorder()2593 void nsCSSBorderRenderer::DrawSingleWidthSolidBorder() {
2594 // Easy enough to deal with.
2595 Rect rect = mOuterRect;
2596 rect.Deflate(0.5);
2597
2598 const twoFloats cornerAdjusts[4] = {
2599 {+0.5, 0}, {0, +0.5}, {-0.5, 0}, {0, -0.5}};
2600 for (const auto side : mozilla::AllPhysicalSides()) {
2601 Point firstCorner = rect.CCWCorner(side) + cornerAdjusts[side];
2602 Point secondCorner = rect.CWCorner(side) + cornerAdjusts[side];
2603
2604 ColorPattern color(ToDeviceColor(mBorderColors[side]));
2605
2606 mDrawTarget->StrokeLine(firstCorner, secondCorner, color);
2607 }
2608 }
2609
2610 // Intersect a ray from the inner corner to the outer corner
2611 // with the border radius, yielding the intersection point.
IntersectBorderRadius(const Point & aCenter,const Size & aRadius,const Point & aInnerCorner,const Point & aCornerDirection)2612 static Point IntersectBorderRadius(const Point& aCenter, const Size& aRadius,
2613 const Point& aInnerCorner,
2614 const Point& aCornerDirection) {
2615 Point toCorner = aCornerDirection;
2616 // transform to-corner ray to unit-circle space
2617 toCorner.x /= aRadius.width;
2618 toCorner.y /= aRadius.height;
2619 // normalize to-corner ray
2620 Float cornerDist = toCorner.Length();
2621 if (cornerDist < 1.0e-6f) {
2622 return aInnerCorner;
2623 }
2624 toCorner = toCorner / cornerDist;
2625 // ray from inner corner to border radius center
2626 Point toCenter = aCenter - aInnerCorner;
2627 // transform to-center ray to unit-circle space
2628 toCenter.x /= aRadius.width;
2629 toCenter.y /= aRadius.height;
2630 // compute offset of intersection with border radius unit circle
2631 Float offset = toCenter.DotProduct(toCorner);
2632 // compute discriminant to check for intersections
2633 Float discrim = 1.0f - toCenter.DotProduct(toCenter) + offset * offset;
2634 // choose farthest intersection
2635 offset += sqrtf(std::max(discrim, 0.0f));
2636 // transform to-corner ray back out of unit-circle space
2637 toCorner.x *= aRadius.width;
2638 toCorner.y *= aRadius.height;
2639 return aInnerCorner + toCorner * offset;
2640 }
2641
2642 // Calculate the split point and split angle for a border radius with
2643 // differing sides.
SplitBorderRadius(const Point & aCenter,const Size & aRadius,const Point & aOuterCorner,const Point & aInnerCorner,const twoFloats & aCornerMults,Float aStartAngle,Point & aSplit,Float & aSplitAngle)2644 static inline void SplitBorderRadius(const Point& aCenter, const Size& aRadius,
2645 const Point& aOuterCorner,
2646 const Point& aInnerCorner,
2647 const twoFloats& aCornerMults,
2648 Float aStartAngle, Point& aSplit,
2649 Float& aSplitAngle) {
2650 Point cornerDir = aOuterCorner - aInnerCorner;
2651 if (cornerDir.x == cornerDir.y && aRadius.IsSquare()) {
2652 // optimize 45-degree intersection with circle since we can assume
2653 // the circle center lies along the intersection edge
2654 aSplit = aCenter - aCornerMults * (aRadius * Float(1.0f / M_SQRT2));
2655 aSplitAngle = aStartAngle + 0.5f * M_PI / 2.0f;
2656 } else {
2657 aSplit = IntersectBorderRadius(aCenter, aRadius, aInnerCorner, cornerDir);
2658 aSplitAngle = atan2f((aSplit.y - aCenter.y) / aRadius.height,
2659 (aSplit.x - aCenter.x) / aRadius.width);
2660 }
2661 }
2662
2663 // Compute the size of the skirt needed, given the color alphas
2664 // of each corner side and the slope between them.
ComputeCornerSkirtSize(Float aAlpha1,Float aAlpha2,Float aSlopeY,Float aSlopeX,Float & aSizeResult,Float & aSlopeResult)2665 static void ComputeCornerSkirtSize(Float aAlpha1, Float aAlpha2, Float aSlopeY,
2666 Float aSlopeX, Float& aSizeResult,
2667 Float& aSlopeResult) {
2668 // If either side is (almost) invisible or there is no diagonal edge,
2669 // then don't try to render a skirt.
2670 if (aAlpha1 < 0.01f || aAlpha2 < 0.01f) {
2671 return;
2672 }
2673 aSlopeX = fabs(aSlopeX);
2674 aSlopeY = fabs(aSlopeY);
2675 if (aSlopeX < 1.0e-6f || aSlopeY < 1.0e-6f) {
2676 return;
2677 }
2678
2679 // If first and second color don't match, we need to split the corner in
2680 // half. The diagonal edges created may not have full pixel coverage given
2681 // anti-aliasing, so we need to compute a small subpixel skirt edge. This
2682 // assumes each half has half coverage to start with, and that coverage
2683 // increases as the skirt is pushed over, with the end result that we want
2684 // to roughly preserve the alpha value along this edge.
2685 // Given slope m, alphas a and A, use quadratic formula to solve for S in:
2686 // a*(1 - 0.5*(1-S)*(1-mS))*(1 - 0.5*A) + 0.5*A = A
2687 // yielding:
2688 // S = ((1+m) - sqrt((1+m)*(1+m) + 4*m*(1 - A/(a*(1-0.5*A))))) / (2*m)
2689 // and substitute k = (1+m)/(2*m):
2690 // S = k - sqrt(k*k + (1 - A/(a*(1-0.5*A)))/m)
2691 Float slope = aSlopeY / aSlopeX;
2692 Float slopeScale = (1.0f + slope) / (2.0f * slope);
2693 Float discrim = slopeScale * slopeScale +
2694 (1 - aAlpha2 / (aAlpha1 * (1.0f - 0.49f * aAlpha2))) / slope;
2695 if (discrim >= 0) {
2696 aSizeResult = slopeScale - sqrtf(discrim);
2697 aSlopeResult = slope;
2698 }
2699 }
2700
2701 // Draws a border radius with possibly different sides.
2702 // A skirt is drawn underneath the corner intersection to hide possible
2703 // seams when anti-aliased drawing is used.
DrawBorderRadius(DrawTarget * aDrawTarget,Corner c,const Point & aOuterCorner,const Point & aInnerCorner,const twoFloats & aCornerMultPrev,const twoFloats & aCornerMultNext,const Size & aCornerDims,const Size & aOuterRadius,const Size & aInnerRadius,const DeviceColor & aFirstColor,const DeviceColor & aSecondColor,Float aSkirtSize,Float aSkirtSlope)2704 static void DrawBorderRadius(
2705 DrawTarget* aDrawTarget, Corner c, const Point& aOuterCorner,
2706 const Point& aInnerCorner, const twoFloats& aCornerMultPrev,
2707 const twoFloats& aCornerMultNext, const Size& aCornerDims,
2708 const Size& aOuterRadius, const Size& aInnerRadius,
2709 const DeviceColor& aFirstColor, const DeviceColor& aSecondColor,
2710 Float aSkirtSize, Float aSkirtSlope) {
2711 // Connect edge to outer arc start point
2712 Point outerCornerStart = aOuterCorner + aCornerMultPrev * aCornerDims;
2713 // Connect edge to outer arc end point
2714 Point outerCornerEnd = aOuterCorner + aCornerMultNext * aCornerDims;
2715 // Connect edge to inner arc start point
2716 Point innerCornerStart =
2717 outerCornerStart + aCornerMultNext * (aCornerDims - aInnerRadius);
2718 // Connect edge to inner arc end point
2719 Point innerCornerEnd =
2720 outerCornerEnd + aCornerMultPrev * (aCornerDims - aInnerRadius);
2721
2722 // Outer arc start point
2723 Point outerArcStart = aOuterCorner + aCornerMultPrev * aOuterRadius;
2724 // Outer arc end point
2725 Point outerArcEnd = aOuterCorner + aCornerMultNext * aOuterRadius;
2726 // Inner arc start point
2727 Point innerArcStart = aInnerCorner + aCornerMultPrev * aInnerRadius;
2728 // Inner arc end point
2729 Point innerArcEnd = aInnerCorner + aCornerMultNext * aInnerRadius;
2730
2731 // Outer radius center
2732 Point outerCenter =
2733 aOuterCorner + (aCornerMultPrev + aCornerMultNext) * aOuterRadius;
2734 // Inner radius center
2735 Point innerCenter =
2736 aInnerCorner + (aCornerMultPrev + aCornerMultNext) * aInnerRadius;
2737
2738 RefPtr<PathBuilder> builder;
2739 RefPtr<Path> path;
2740
2741 if (aFirstColor.a > 0) {
2742 builder = aDrawTarget->CreatePathBuilder();
2743 builder->MoveTo(outerCornerStart);
2744 }
2745
2746 if (aFirstColor != aSecondColor) {
2747 // Start and end angles of corner quadrant
2748 Float startAngle = (c * M_PI) / 2.0f - M_PI,
2749 endAngle = startAngle + M_PI / 2.0f, outerSplitAngle, innerSplitAngle;
2750 Point outerSplit, innerSplit;
2751
2752 // Outer half-way point
2753 SplitBorderRadius(outerCenter, aOuterRadius, aOuterCorner, aInnerCorner,
2754 aCornerMultPrev + aCornerMultNext, startAngle, outerSplit,
2755 outerSplitAngle);
2756 // Inner half-way point
2757 if (aInnerRadius.IsEmpty()) {
2758 innerSplit = aInnerCorner;
2759 innerSplitAngle = endAngle;
2760 } else {
2761 SplitBorderRadius(innerCenter, aInnerRadius, aOuterCorner, aInnerCorner,
2762 aCornerMultPrev + aCornerMultNext, startAngle,
2763 innerSplit, innerSplitAngle);
2764 }
2765
2766 // Draw first half with first color
2767 if (aFirstColor.a > 0) {
2768 AcuteArcToBezier(builder.get(), outerCenter, aOuterRadius, outerArcStart,
2769 outerSplit, startAngle, outerSplitAngle);
2770 // Draw skirt as part of first half
2771 if (aSkirtSize > 0) {
2772 builder->LineTo(outerSplit + aCornerMultNext * aSkirtSize);
2773 builder->LineTo(innerSplit -
2774 aCornerMultPrev * (aSkirtSize * aSkirtSlope));
2775 }
2776 AcuteArcToBezier(builder.get(), innerCenter, aInnerRadius, innerSplit,
2777 innerArcStart, innerSplitAngle, startAngle);
2778 if ((innerCornerStart - innerArcStart).DotProduct(aCornerMultPrev) > 0) {
2779 builder->LineTo(innerCornerStart);
2780 }
2781 builder->Close();
2782 path = builder->Finish();
2783 aDrawTarget->Fill(path, ColorPattern(aFirstColor));
2784 }
2785
2786 // Draw second half with second color
2787 if (aSecondColor.a > 0) {
2788 builder = aDrawTarget->CreatePathBuilder();
2789 builder->MoveTo(outerCornerEnd);
2790 if ((innerArcEnd - innerCornerEnd).DotProduct(aCornerMultNext) < 0) {
2791 builder->LineTo(innerCornerEnd);
2792 }
2793 AcuteArcToBezier(builder.get(), innerCenter, aInnerRadius, innerArcEnd,
2794 innerSplit, endAngle, innerSplitAngle);
2795 AcuteArcToBezier(builder.get(), outerCenter, aOuterRadius, outerSplit,
2796 outerArcEnd, outerSplitAngle, endAngle);
2797 builder->Close();
2798 path = builder->Finish();
2799 aDrawTarget->Fill(path, ColorPattern(aSecondColor));
2800 }
2801 } else if (aFirstColor.a > 0) {
2802 // Draw corner with single color
2803 AcuteArcToBezier(builder.get(), outerCenter, aOuterRadius, outerArcStart,
2804 outerArcEnd);
2805 builder->LineTo(outerCornerEnd);
2806 if ((innerArcEnd - innerCornerEnd).DotProduct(aCornerMultNext) < 0) {
2807 builder->LineTo(innerCornerEnd);
2808 }
2809 AcuteArcToBezier(builder.get(), innerCenter, aInnerRadius, innerArcEnd,
2810 innerArcStart, -kKappaFactor);
2811 if ((innerCornerStart - innerArcStart).DotProduct(aCornerMultPrev) > 0) {
2812 builder->LineTo(innerCornerStart);
2813 }
2814 builder->Close();
2815 path = builder->Finish();
2816 aDrawTarget->Fill(path, ColorPattern(aFirstColor));
2817 }
2818 }
2819
2820 // Draw a corner with possibly different sides.
2821 // A skirt is drawn underneath the corner intersection to hide possible
2822 // seams when anti-aliased drawing is used.
DrawCorner(DrawTarget * aDrawTarget,const Point & aOuterCorner,const Point & aInnerCorner,const twoFloats & aCornerMultPrev,const twoFloats & aCornerMultNext,const Size & aCornerDims,const DeviceColor & aFirstColor,const DeviceColor & aSecondColor,Float aSkirtSize,Float aSkirtSlope)2823 static void DrawCorner(DrawTarget* aDrawTarget, const Point& aOuterCorner,
2824 const Point& aInnerCorner,
2825 const twoFloats& aCornerMultPrev,
2826 const twoFloats& aCornerMultNext,
2827 const Size& aCornerDims, const DeviceColor& aFirstColor,
2828 const DeviceColor& aSecondColor, Float aSkirtSize,
2829 Float aSkirtSlope) {
2830 // Corner box start point
2831 Point cornerStart = aOuterCorner + aCornerMultPrev * aCornerDims;
2832 // Corner box end point
2833 Point cornerEnd = aOuterCorner + aCornerMultNext * aCornerDims;
2834
2835 RefPtr<PathBuilder> builder;
2836 RefPtr<Path> path;
2837
2838 if (aFirstColor.a > 0) {
2839 builder = aDrawTarget->CreatePathBuilder();
2840 builder->MoveTo(cornerStart);
2841 }
2842
2843 if (aFirstColor != aSecondColor) {
2844 // Draw first half with first color
2845 if (aFirstColor.a > 0) {
2846 builder->LineTo(aOuterCorner);
2847 // Draw skirt as part of first half
2848 if (aSkirtSize > 0) {
2849 builder->LineTo(aOuterCorner + aCornerMultNext * aSkirtSize);
2850 builder->LineTo(aInnerCorner -
2851 aCornerMultPrev * (aSkirtSize * aSkirtSlope));
2852 }
2853 builder->LineTo(aInnerCorner);
2854 builder->Close();
2855 path = builder->Finish();
2856 aDrawTarget->Fill(path, ColorPattern(aFirstColor));
2857 }
2858
2859 // Draw second half with second color
2860 if (aSecondColor.a > 0) {
2861 builder = aDrawTarget->CreatePathBuilder();
2862 builder->MoveTo(cornerEnd);
2863 builder->LineTo(aInnerCorner);
2864 builder->LineTo(aOuterCorner);
2865 builder->Close();
2866 path = builder->Finish();
2867 aDrawTarget->Fill(path, ColorPattern(aSecondColor));
2868 }
2869 } else if (aFirstColor.a > 0) {
2870 // Draw corner with single color
2871 builder->LineTo(aOuterCorner);
2872 builder->LineTo(cornerEnd);
2873 builder->LineTo(aInnerCorner);
2874 builder->Close();
2875 path = builder->Finish();
2876 aDrawTarget->Fill(path, ColorPattern(aFirstColor));
2877 }
2878 }
2879
DrawSolidBorder()2880 void nsCSSBorderRenderer::DrawSolidBorder() {
2881 const twoFloats cornerMults[4] = {{-1, 0}, {0, -1}, {+1, 0}, {0, +1}};
2882
2883 const twoFloats centerAdjusts[4] = {
2884 {0, +0.5}, {-0.5, 0}, {0, -0.5}, {+0.5, 0}};
2885
2886 RectCornerRadii innerRadii;
2887 ComputeInnerRadii(mBorderRadii, mBorderWidths, &innerRadii);
2888
2889 Rect strokeRect = mOuterRect;
2890 strokeRect.Deflate(Margin(mBorderWidths[0] / 2.0, mBorderWidths[1] / 2.0,
2891 mBorderWidths[2] / 2.0, mBorderWidths[3] / 2.0));
2892
2893 for (const auto i : mozilla::AllPhysicalSides()) {
2894 // We now draw the current side and the CW corner following it.
2895 // The CCW corner of this side was already drawn in the previous iteration.
2896 // The side will be drawn as an explicit stroke, and the CW corner will be
2897 // filled separately.
2898 // If the next side does not have a matching color, then we split the
2899 // corner into two halves, one of each side's color and draw both.
2900 // Thus, the CCW corner of the next side will end up drawn here.
2901
2902 // the corner index -- either 1 2 3 0 (cw) or 0 3 2 1 (ccw)
2903 Corner c = Corner((i + 1) % 4);
2904 Corner prevCorner = Corner(i);
2905
2906 // i+2 and i+3 respectively. These are used to index into the corner
2907 // multiplier table, and were deduced by calculating out the long form
2908 // of each corner and finding a pattern in the signs and values.
2909 int i1 = (i + 1) % 4;
2910 int i2 = (i + 2) % 4;
2911 int i3 = (i + 3) % 4;
2912
2913 Float sideWidth = 0.0f;
2914 DeviceColor firstColor, secondColor;
2915 if (IsVisible(mBorderStyles[i]) && mBorderWidths[i]) {
2916 // draw the side since it is visible
2917 sideWidth = mBorderWidths[i];
2918 firstColor = ToDeviceColor(mBorderColors[i]);
2919 // if the next side is visible, use its color for corner
2920 secondColor = IsVisible(mBorderStyles[i1]) && mBorderWidths[i1]
2921 ? ToDeviceColor(mBorderColors[i1])
2922 : firstColor;
2923 } else if (IsVisible(mBorderStyles[i1]) && mBorderWidths[i1]) {
2924 // assign next side's color to both corner sides
2925 firstColor = ToDeviceColor(mBorderColors[i1]);
2926 secondColor = firstColor;
2927 } else {
2928 // neither side is visible, so nothing to do
2929 continue;
2930 }
2931
2932 Point outerCorner = mOuterRect.AtCorner(c);
2933 Point innerCorner = mInnerRect.AtCorner(c);
2934
2935 // start and end points of border side stroke between corners
2936 Point sideStart = mOuterRect.AtCorner(prevCorner) +
2937 cornerMults[i2] * mBorderCornerDimensions[prevCorner];
2938 Point sideEnd = outerCorner + cornerMults[i] * mBorderCornerDimensions[c];
2939 // check if the side is visible and not inverted
2940 if (sideWidth > 0 && firstColor.a > 0 &&
2941 -(sideEnd - sideStart).DotProduct(cornerMults[i]) > 0) {
2942 mDrawTarget->StrokeLine(sideStart + centerAdjusts[i] * sideWidth,
2943 sideEnd + centerAdjusts[i] * sideWidth,
2944 ColorPattern(firstColor),
2945 StrokeOptions(sideWidth));
2946 }
2947
2948 Float skirtSize = 0.0f, skirtSlope = 0.0f;
2949 // the sides don't match, so compute a skirt
2950 if (firstColor != secondColor &&
2951 mPresContext->Type() != nsPresContext::eContext_Print) {
2952 Point cornerDir = outerCorner - innerCorner;
2953 ComputeCornerSkirtSize(
2954 firstColor.a, secondColor.a, cornerDir.DotProduct(cornerMults[i]),
2955 cornerDir.DotProduct(cornerMults[i3]), skirtSize, skirtSlope);
2956 }
2957
2958 if (!mBorderRadii[c].IsEmpty()) {
2959 // the corner has a border radius
2960 DrawBorderRadius(mDrawTarget, c, outerCorner, innerCorner, cornerMults[i],
2961 cornerMults[i3], mBorderCornerDimensions[c],
2962 mBorderRadii[c], innerRadii[c], firstColor, secondColor,
2963 skirtSize, skirtSlope);
2964 } else if (!mBorderCornerDimensions[c].IsEmpty()) {
2965 // a corner with no border radius
2966 DrawCorner(mDrawTarget, outerCorner, innerCorner, cornerMults[i],
2967 cornerMults[i3], mBorderCornerDimensions[c], firstColor,
2968 secondColor, skirtSize, skirtSlope);
2969 }
2970 }
2971 }
2972
DrawBorders()2973 void nsCSSBorderRenderer::DrawBorders() {
2974 if (mAllBordersSameStyle && (mBorderStyles[0] == StyleBorderStyle::None ||
2975 mBorderStyles[0] == StyleBorderStyle::Hidden ||
2976 mBorderColors[0] == NS_RGBA(0, 0, 0, 0))) {
2977 // All borders are the same style, and the style is either none or hidden,
2978 // or the color is transparent.
2979 return;
2980 }
2981
2982 if (mAllBordersSameWidth && mBorderWidths[0] == 0.0) {
2983 // Some of the mAllBordersSameWidth codepaths depend on the border
2984 // width being greater than zero.
2985 return;
2986 }
2987
2988 AutoRestoreTransform autoRestoreTransform;
2989 Matrix mat = mDrawTarget->GetTransform();
2990
2991 // Clamp the CTM to be pixel-aligned; we do this only
2992 // for translation-only matrices now, but we could do it
2993 // if the matrix has just a scale as well. We should not
2994 // do it if there's a rotation.
2995 if (mat.HasNonTranslation()) {
2996 if (!mat.HasNonAxisAlignedTransform()) {
2997 // Scale + transform. Avoid stroke fast-paths so that we have a chance
2998 // of snapping to pixel boundaries.
2999 mAvoidStroke = true;
3000 }
3001 } else {
3002 mat._31 = floor(mat._31 + 0.5);
3003 mat._32 = floor(mat._32 + 0.5);
3004 autoRestoreTransform.Init(mDrawTarget);
3005 mDrawTarget->SetTransform(mat);
3006
3007 // round mOuterRect and mInnerRect; they're already an integer
3008 // number of pixels apart and should stay that way after
3009 // rounding. We don't do this if there's a scale in the current transform
3010 // since this loses information that might be relevant when we're scaling.
3011 mOuterRect.Round();
3012 mInnerRect.Round();
3013 }
3014
3015 // Initial values only used when the border colors/widths are all the same:
3016 ColorPattern color(ToDeviceColor(mBorderColors[eSideTop]));
3017 StrokeOptions strokeOptions(mBorderWidths[eSideTop]); // stroke width
3018
3019 // First there's a couple of 'special cases' that have specifically optimized
3020 // drawing paths, when none of these can be used we move on to the generalized
3021 // border drawing code.
3022 if (mAllBordersSameStyle && mAllBordersSameWidth &&
3023 mBorderStyles[0] == StyleBorderStyle::Solid && mNoBorderRadius &&
3024 !mAvoidStroke) {
3025 // Very simple case.
3026 Rect rect = mOuterRect;
3027 rect.Deflate(mBorderWidths[0] / 2.0);
3028 mDrawTarget->StrokeRect(rect, color, strokeOptions);
3029 return;
3030 }
3031
3032 if (mAllBordersSameStyle && mBorderStyles[0] == StyleBorderStyle::Solid &&
3033 !mAvoidStroke && !mNoBorderRadius) {
3034 // Relatively simple case.
3035 RoundedRect borderInnerRect(mOuterRect, mBorderRadii);
3036 borderInnerRect.Deflate(mBorderWidths[eSideTop], mBorderWidths[eSideBottom],
3037 mBorderWidths[eSideLeft],
3038 mBorderWidths[eSideRight]);
3039
3040 // Instead of stroking we just use two paths: an inner and an outer.
3041 // This allows us to draw borders that we couldn't when stroking. For
3042 // example, borders with a border width >= the border radius. (i.e. when
3043 // there are square corners on the inside)
3044 //
3045 // Further, this approach can be more efficient because the backend
3046 // doesn't need to compute an offset curve to stroke the path. We know that
3047 // the rounded parts are elipses we can offset exactly and can just compute
3048 // a new cubic approximation.
3049 RefPtr<PathBuilder> builder = mDrawTarget->CreatePathBuilder();
3050 AppendRoundedRectToPath(builder, mOuterRect, mBorderRadii, true);
3051 AppendRoundedRectToPath(builder, borderInnerRect.rect,
3052 borderInnerRect.corners, false);
3053 RefPtr<Path> path = builder->Finish();
3054 mDrawTarget->Fill(path, color);
3055 return;
3056 }
3057
3058 const bool allBordersSolid = AllBordersSolid();
3059
3060 // This leaves the border corners non-interpolated for single width borders.
3061 // Doing this is slightly faster and shouldn't be a problem visually.
3062 if (allBordersSolid && mAllBordersSameWidth && mBorderWidths[0] == 1 &&
3063 mNoBorderRadius && !mAvoidStroke) {
3064 DrawSingleWidthSolidBorder();
3065 return;
3066 }
3067
3068 if (allBordersSolid && !mAvoidStroke) {
3069 DrawSolidBorder();
3070 return;
3071 }
3072
3073 PrintAsString(" mOuterRect: ");
3074 PrintAsString(mOuterRect);
3075 PrintAsStringNewline();
3076 PrintAsString(" mInnerRect: ");
3077 PrintAsString(mInnerRect);
3078 PrintAsStringNewline();
3079 PrintAsFormatString(" mBorderColors: 0x%08x 0x%08x 0x%08x 0x%08x\n",
3080 mBorderColors[0], mBorderColors[1], mBorderColors[2],
3081 mBorderColors[3]);
3082
3083 // if conditioning the outside rect failed, then bail -- the outside
3084 // rect is supposed to enclose the entire border
3085 {
3086 gfxRect outerRect = ThebesRect(mOuterRect);
3087 gfxUtils::ConditionRect(outerRect);
3088 if (outerRect.IsEmpty()) {
3089 return;
3090 }
3091 mOuterRect = ToRect(outerRect);
3092
3093 gfxRect innerRect = ThebesRect(mInnerRect);
3094 gfxUtils::ConditionRect(innerRect);
3095 mInnerRect = ToRect(innerRect);
3096 }
3097
3098 SideBits dashedSides = SideBits::eNone;
3099 bool forceSeparateCorners = false;
3100
3101 for (const auto i : mozilla::AllPhysicalSides()) {
3102 StyleBorderStyle style = mBorderStyles[i];
3103 if (style == StyleBorderStyle::Dashed ||
3104 style == StyleBorderStyle::Dotted) {
3105 // we need to draw things separately for dashed/dotting
3106 forceSeparateCorners = true;
3107 dashedSides |= static_cast<mozilla::SideBits>(1 << i);
3108 }
3109 }
3110
3111 PrintAsFormatString(" mAllBordersSameStyle: %d dashedSides: 0x%02x\n",
3112 mAllBordersSameStyle,
3113 static_cast<unsigned int>(dashedSides));
3114
3115 if (mAllBordersSameStyle && !forceSeparateCorners) {
3116 /* Draw everything in one go */
3117 DrawBorderSides(SideBits::eAll);
3118 PrintAsStringNewline("---------------- (1)");
3119 } else {
3120 AUTO_PROFILER_LABEL("nsCSSBorderRenderer::DrawBorders:multipass", GRAPHICS);
3121
3122 /* We have more than one pass to go. Draw the corners separately from the
3123 * sides. */
3124
3125 // The corner is going to have negligible size if its two adjacent border
3126 // sides are only 1px wide and there is no border radius. In that case we
3127 // skip the overhead of painting the corner by setting the width or height
3128 // of the corner to zero, which effectively extends one of the corner's
3129 // adjacent border sides. We extend the longer adjacent side so that
3130 // opposite sides will be the same length, which is necessary for opposite
3131 // dashed/dotted sides to be symmetrical.
3132 //
3133 // if width > height
3134 // +--+--------------+--+ +--------------------+
3135 // | | | | | |
3136 // +--+--------------+--+ +--+--------------+--+
3137 // | | | | | | | |
3138 // | | | | => | | | |
3139 // | | | | | | | |
3140 // +--+--------------+--+ +--+--------------+--+
3141 // | | | | | |
3142 // +--+--------------+--+ +--------------------+
3143 //
3144 // if width <= height
3145 // +--+--------+--+ +--+--------+--+
3146 // | | | | | | | |
3147 // +--+--------+--+ | +--------+ |
3148 // | | | | | | | |
3149 // | | | | | | | |
3150 // | | | | | | | |
3151 // | | | | => | | | |
3152 // | | | | | | | |
3153 // | | | | | | | |
3154 // | | | | | | | |
3155 // +--+--------+--+ | +--------+ |
3156 // | | | | | | | |
3157 // +--+--------+--+ +--+--------+--+
3158 //
3159 // Note that if we have different border widths we could end up with
3160 // opposite sides of different length. For example, if the left and
3161 // bottom borders are 2px wide instead of 1px, we will end up doing
3162 // something like:
3163 //
3164 // +----+------------+--+ +----+---------------+
3165 // | | | | | | |
3166 // +----+------------+--+ +----+------------+--+
3167 // | | | | | | | |
3168 // | | | | => | | | |
3169 // | | | | | | | |
3170 // +----+------------+--+ +----+------------+--+
3171 // | | | | | | | |
3172 // | | | | | | | |
3173 // +----+------------+--+ +----+------------+--+
3174 //
3175 // XXX Should we only do this optimization if |mAllBordersSameWidth| is
3176 // true?
3177 //
3178 // XXX In fact is this optimization even worth the complexity it adds to
3179 // the code? 1px wide dashed borders are not overly common, and drawing
3180 // corners for them is not that expensive.
3181 for (const auto corner : mozilla::AllPhysicalCorners()) {
3182 const mozilla::Side sides[2] = {mozilla::Side(corner), PREV_SIDE(corner)};
3183
3184 if (!IsZeroSize(mBorderRadii[corner])) {
3185 continue;
3186 }
3187
3188 if (mBorderWidths[sides[0]] == 1.0 && mBorderWidths[sides[1]] == 1.0) {
3189 if (mOuterRect.Width() > mOuterRect.Height()) {
3190 mBorderCornerDimensions[corner].width = 0.0;
3191 } else {
3192 mBorderCornerDimensions[corner].height = 0.0;
3193 }
3194 }
3195 }
3196
3197 // First, the corners
3198 for (const auto corner : mozilla::AllPhysicalCorners()) {
3199 // if there's no corner, don't do all this work for it
3200 if (IsZeroSize(mBorderCornerDimensions[corner])) {
3201 continue;
3202 }
3203
3204 const int sides[2] = {corner, PREV_SIDE(corner)};
3205 SideBits sideBits =
3206 static_cast<SideBits>((1 << sides[0]) | (1 << sides[1]));
3207
3208 bool simpleCornerStyle = AreBorderSideFinalStylesSame(sideBits);
3209
3210 // If we don't have anything complex going on in this corner,
3211 // then we can just fill the corner with a solid color, and avoid
3212 // the potentially expensive clip.
3213 if (simpleCornerStyle && IsZeroSize(mBorderRadii[corner]) &&
3214 IsSolidCornerStyle(mBorderStyles[sides[0]], corner)) {
3215 sRGBColor color = MakeBorderColor(
3216 mBorderColors[sides[0]],
3217 BorderColorStyleForSolidCorner(mBorderStyles[sides[0]], corner));
3218 mDrawTarget->FillRect(GetCornerRect(corner),
3219 ColorPattern(ToDeviceColor(color)));
3220 continue;
3221 }
3222
3223 // clip to the corner
3224 mDrawTarget->PushClipRect(GetCornerRect(corner));
3225
3226 if (simpleCornerStyle) {
3227 // we don't need a group for this corner, the sides are the same,
3228 // but we weren't able to render just a solid block for the corner.
3229 DrawBorderSides(sideBits);
3230 } else {
3231 // Sides are different. We could draw using OP_ADD to
3232 // get correct color blending behaviour at the seam. We'd need
3233 // to do it in an offscreen surface to ensure that we're
3234 // always compositing on transparent black. If the colors
3235 // don't have transparency and the current destination surface
3236 // has an alpha channel, we could just clear the region and
3237 // avoid the temporary, but that situation doesn't happen all
3238 // that often in practice (we double buffer to no-alpha
3239 // surfaces). We choose just to seam though, as the performance
3240 // advantages outway the modest easthetic improvement.
3241
3242 for (int cornerSide = 0; cornerSide < 2; cornerSide++) {
3243 mozilla::Side side = mozilla::Side(sides[cornerSide]);
3244 StyleBorderStyle style = mBorderStyles[side];
3245
3246 PrintAsFormatString("corner: %d cornerSide: %d side: %d style: %d\n",
3247 corner, cornerSide, side,
3248 static_cast<int>(style));
3249
3250 RefPtr<Path> path = GetSideClipSubPath(side);
3251 mDrawTarget->PushClip(path);
3252
3253 DrawBorderSides(static_cast<mozilla::SideBits>(1 << side));
3254
3255 mDrawTarget->PopClip();
3256 }
3257 }
3258
3259 mDrawTarget->PopClip();
3260
3261 PrintAsStringNewline();
3262 }
3263
3264 // in the case of a single-unit border, we already munged the
3265 // corners up above; so we can just draw the top left and bottom
3266 // right sides separately, if they're the same.
3267 //
3268 // We need to check for mNoBorderRadius, because when there is
3269 // one, FillSolidBorder always draws the full rounded rectangle
3270 // and expects there to be a clip in place.
3271 SideBits alreadyDrawnSides = SideBits::eNone;
3272 if (mOneUnitBorder && mNoBorderRadius &&
3273 (dashedSides & (SideBits::eTop | SideBits::eLeft)) == SideBits::eNone) {
3274 bool tlBordersSameStyle =
3275 AreBorderSideFinalStylesSame(SideBits::eTop | SideBits::eLeft);
3276 bool brBordersSameStyle =
3277 AreBorderSideFinalStylesSame(SideBits::eBottom | SideBits::eRight);
3278
3279 if (tlBordersSameStyle) {
3280 DrawBorderSides(SideBits::eTop | SideBits::eLeft);
3281 alreadyDrawnSides |= (SideBits::eTop | SideBits::eLeft);
3282 }
3283
3284 if (brBordersSameStyle &&
3285 (dashedSides & (SideBits::eBottom | SideBits::eRight)) ==
3286 SideBits::eNone) {
3287 DrawBorderSides(SideBits::eBottom | SideBits::eRight);
3288 alreadyDrawnSides |= (SideBits::eBottom | SideBits::eRight);
3289 }
3290 }
3291
3292 // We're done with the corners, now draw the sides.
3293 for (const auto side : mozilla::AllPhysicalSides()) {
3294 // if we drew it above, skip it
3295 if (alreadyDrawnSides & static_cast<mozilla::SideBits>(1 << side)) {
3296 continue;
3297 }
3298
3299 // If there's no border on this side, skip it
3300 if (mBorderWidths[side] == 0.0 ||
3301 mBorderStyles[side] == StyleBorderStyle::Hidden ||
3302 mBorderStyles[side] == StyleBorderStyle::None) {
3303 continue;
3304 }
3305
3306 if (dashedSides & static_cast<mozilla::SideBits>(1 << side)) {
3307 // Dashed sides will always draw just the part ignoring the
3308 // corners for the side, so no need to clip.
3309 DrawDashedOrDottedSide(side);
3310
3311 PrintAsStringNewline("---------------- (d)");
3312 continue;
3313 }
3314
3315 // Undashed sides will currently draw the entire side,
3316 // including parts that would normally be covered by a corner,
3317 // so we need to clip.
3318 //
3319 // XXX Optimization -- it would be good to make this work like
3320 // DrawDashedOrDottedSide, and have a DrawOneSide function that just
3321 // draws one side and not the corners, because then we can
3322 // avoid the potentially expensive clip.
3323 mDrawTarget->PushClipRect(GetSideClipWithoutCornersRect(side));
3324
3325 DrawBorderSides(static_cast<mozilla::SideBits>(1 << side));
3326
3327 mDrawTarget->PopClip();
3328
3329 PrintAsStringNewline("---------------- (*)");
3330 }
3331 }
3332 }
3333
CreateWebRenderCommands(nsDisplayItem * aItem,wr::DisplayListBuilder & aBuilder,wr::IpcResourceUpdateQueue & aResources,const layers::StackingContextHelper & aSc)3334 void nsCSSBorderRenderer::CreateWebRenderCommands(
3335 nsDisplayItem* aItem, wr::DisplayListBuilder& aBuilder,
3336 wr::IpcResourceUpdateQueue& aResources,
3337 const layers::StackingContextHelper& aSc) {
3338 LayoutDeviceRect outerRect = LayoutDeviceRect::FromUnknownRect(mOuterRect);
3339 wr::LayoutRect roundedRect = wr::ToLayoutRect(outerRect);
3340 wr::LayoutRect clipRect = roundedRect;
3341 wr::BorderSide side[4];
3342 for (const auto i : mozilla::AllPhysicalSides()) {
3343 side[i] =
3344 wr::ToBorderSide(ToDeviceColor(mBorderColors[i]), mBorderStyles[i]);
3345 }
3346
3347 wr::BorderRadius borderRadius = wr::ToBorderRadius(mBorderRadii);
3348
3349 if (mLocalClip) {
3350 LayoutDeviceRect localClip =
3351 LayoutDeviceRect::FromUnknownRect(mLocalClip.value());
3352 clipRect = wr::ToLayoutRect(localClip.Intersect(outerRect));
3353 }
3354
3355 Range<const wr::BorderSide> wrsides(side, 4);
3356 aBuilder.PushBorder(roundedRect, clipRect, mBackfaceIsVisible,
3357 wr::ToBorderWidths(mBorderWidths[0], mBorderWidths[1],
3358 mBorderWidths[2], mBorderWidths[3]),
3359 wrsides, borderRadius);
3360 }
3361
3362 /* static */
3363 Maybe<nsCSSBorderImageRenderer>
CreateBorderImageRenderer(nsPresContext * aPresContext,nsIFrame * aForFrame,const nsRect & aBorderArea,const nsStyleBorder & aStyleBorder,const nsRect & aDirtyRect,Sides aSkipSides,uint32_t aFlags,ImgDrawResult * aDrawResult)3364 nsCSSBorderImageRenderer::CreateBorderImageRenderer(
3365 nsPresContext* aPresContext, nsIFrame* aForFrame, const nsRect& aBorderArea,
3366 const nsStyleBorder& aStyleBorder, const nsRect& aDirtyRect,
3367 Sides aSkipSides, uint32_t aFlags, ImgDrawResult* aDrawResult) {
3368 MOZ_ASSERT(aDrawResult);
3369
3370 if (aDirtyRect.IsEmpty()) {
3371 *aDrawResult = ImgDrawResult::SUCCESS;
3372 return Nothing();
3373 }
3374
3375 nsImageRenderer imgRenderer(aForFrame, &aStyleBorder.mBorderImageSource,
3376 aFlags);
3377 if (!imgRenderer.PrepareImage()) {
3378 *aDrawResult = imgRenderer.PrepareResult();
3379 return Nothing();
3380 }
3381
3382 // We should always get here with the frame's border, but we may construct an
3383 // nsStyleBorder om the stack to deal with :visited and other shenaningans.
3384 //
3385 // We always copy the border image and such from the non-visited one, so
3386 // there's no need to do anything with it.
3387 MOZ_ASSERT(aStyleBorder.GetBorderImageRequest() ==
3388 aForFrame->StyleBorder()->GetBorderImageRequest());
3389
3390 nsCSSBorderImageRenderer renderer(aForFrame, aBorderArea, aStyleBorder,
3391 aSkipSides, imgRenderer);
3392 *aDrawResult = ImgDrawResult::SUCCESS;
3393 return Some(renderer);
3394 }
3395
DrawBorderImage(nsPresContext * aPresContext,gfxContext & aRenderingContext,nsIFrame * aForFrame,const nsRect & aDirtyRect)3396 ImgDrawResult nsCSSBorderImageRenderer::DrawBorderImage(
3397 nsPresContext* aPresContext, gfxContext& aRenderingContext,
3398 nsIFrame* aForFrame, const nsRect& aDirtyRect) {
3399 // NOTE: no Save() yet, we do that later by calling autoSR.EnsureSaved()
3400 // in case we need it.
3401 gfxContextAutoSaveRestore autoSR;
3402
3403 if (!mClip.IsEmpty()) {
3404 autoSR.EnsureSaved(&aRenderingContext);
3405 aRenderingContext.Clip(NSRectToSnappedRect(
3406 mClip, aForFrame->PresContext()->AppUnitsPerDevPixel(),
3407 *aRenderingContext.GetDrawTarget()));
3408 }
3409
3410 // intrinsicSize.CanComputeConcreteSize() return false means we can not
3411 // read intrinsic size from aStyleBorder.mBorderImageSource.
3412 // In this condition, we pass imageSize(a resolved size comes from
3413 // default sizing algorithm) to renderer as the viewport size.
3414 CSSSizeOrRatio intrinsicSize = mImageRenderer.ComputeIntrinsicSize();
3415 Maybe<nsSize> svgViewportSize =
3416 intrinsicSize.CanComputeConcreteSize() ? Nothing() : Some(mImageSize);
3417 bool hasIntrinsicRatio = intrinsicSize.HasRatio();
3418 mImageRenderer.PurgeCacheForViewportChange(svgViewportSize,
3419 hasIntrinsicRatio);
3420
3421 // These helper tables recharacterize the 'slice' and 'width' margins
3422 // in a more convenient form: they are the x/y/width/height coords
3423 // required for various bands of the border, and they have been transformed
3424 // to be relative to the innerRect (for 'slice') or the page (for 'border').
3425 enum { LEFT, MIDDLE, RIGHT, TOP = LEFT, BOTTOM = RIGHT };
3426 const nscoord borderX[3] = {
3427 mArea.x + 0,
3428 mArea.x + mWidths.left,
3429 mArea.x + mArea.width - mWidths.right,
3430 };
3431 const nscoord borderY[3] = {
3432 mArea.y + 0,
3433 mArea.y + mWidths.top,
3434 mArea.y + mArea.height - mWidths.bottom,
3435 };
3436 const nscoord borderWidth[3] = {
3437 mWidths.left,
3438 mArea.width - mWidths.left - mWidths.right,
3439 mWidths.right,
3440 };
3441 const nscoord borderHeight[3] = {
3442 mWidths.top,
3443 mArea.height - mWidths.top - mWidths.bottom,
3444 mWidths.bottom,
3445 };
3446 const int32_t sliceX[3] = {
3447 0,
3448 mSlice.left,
3449 mImageSize.width - mSlice.right,
3450 };
3451 const int32_t sliceY[3] = {
3452 0,
3453 mSlice.top,
3454 mImageSize.height - mSlice.bottom,
3455 };
3456 const int32_t sliceWidth[3] = {
3457 mSlice.left,
3458 std::max(mImageSize.width - mSlice.left - mSlice.right, 0),
3459 mSlice.right,
3460 };
3461 const int32_t sliceHeight[3] = {
3462 mSlice.top,
3463 std::max(mImageSize.height - mSlice.top - mSlice.bottom, 0),
3464 mSlice.bottom,
3465 };
3466
3467 ImgDrawResult result = ImgDrawResult::SUCCESS;
3468
3469 for (int i = LEFT; i <= RIGHT; i++) {
3470 for (int j = TOP; j <= BOTTOM; j++) {
3471 StyleBorderImageRepeat fillStyleH, fillStyleV;
3472 nsSize unitSize;
3473
3474 if (i == MIDDLE && j == MIDDLE) {
3475 // Discard the middle portion unless set to fill.
3476 if (!mFill) {
3477 continue;
3478 }
3479
3480 // css-background:
3481 // The middle image's width is scaled by the same factor as the
3482 // top image unless that factor is zero or infinity, in which
3483 // case the scaling factor of the bottom is substituted, and
3484 // failing that, the width is not scaled. The height of the
3485 // middle image is scaled by the same factor as the left image
3486 // unless that factor is zero or infinity, in which case the
3487 // scaling factor of the right image is substituted, and failing
3488 // that, the height is not scaled.
3489 gfxFloat hFactor, vFactor;
3490
3491 if (0 < mWidths.left && 0 < mSlice.left) {
3492 vFactor = gfxFloat(mWidths.left) / mSlice.left;
3493 } else if (0 < mWidths.right && 0 < mSlice.right) {
3494 vFactor = gfxFloat(mWidths.right) / mSlice.right;
3495 } else {
3496 vFactor = 1;
3497 }
3498
3499 if (0 < mWidths.top && 0 < mSlice.top) {
3500 hFactor = gfxFloat(mWidths.top) / mSlice.top;
3501 } else if (0 < mWidths.bottom && 0 < mSlice.bottom) {
3502 hFactor = gfxFloat(mWidths.bottom) / mSlice.bottom;
3503 } else {
3504 hFactor = 1;
3505 }
3506
3507 unitSize.width = sliceWidth[i] * hFactor;
3508 unitSize.height = sliceHeight[j] * vFactor;
3509 fillStyleH = mRepeatModeHorizontal;
3510 fillStyleV = mRepeatModeVertical;
3511
3512 } else if (i == MIDDLE) { // top, bottom
3513 // Sides are always stretched to the thickness of their border,
3514 // and stretched proportionately on the other axis.
3515 gfxFloat factor;
3516 if (0 < borderHeight[j] && 0 < sliceHeight[j]) {
3517 factor = gfxFloat(borderHeight[j]) / sliceHeight[j];
3518 } else {
3519 factor = 1;
3520 }
3521
3522 unitSize.width = sliceWidth[i] * factor;
3523 unitSize.height = borderHeight[j];
3524 fillStyleH = mRepeatModeHorizontal;
3525 fillStyleV = StyleBorderImageRepeat::Stretch;
3526
3527 } else if (j == MIDDLE) { // left, right
3528 gfxFloat factor;
3529 if (0 < borderWidth[i] && 0 < sliceWidth[i]) {
3530 factor = gfxFloat(borderWidth[i]) / sliceWidth[i];
3531 } else {
3532 factor = 1;
3533 }
3534
3535 unitSize.width = borderWidth[i];
3536 unitSize.height = sliceHeight[j] * factor;
3537 fillStyleH = StyleBorderImageRepeat::Stretch;
3538 fillStyleV = mRepeatModeVertical;
3539
3540 } else {
3541 // Corners are always stretched to fit the corner.
3542 unitSize.width = borderWidth[i];
3543 unitSize.height = borderHeight[j];
3544 fillStyleH = StyleBorderImageRepeat::Stretch;
3545 fillStyleV = StyleBorderImageRepeat::Stretch;
3546 }
3547
3548 nsRect destArea(borderX[i], borderY[j], borderWidth[i], borderHeight[j]);
3549 nsRect subArea(sliceX[i], sliceY[j], sliceWidth[i], sliceHeight[j]);
3550 if (subArea.IsEmpty()) continue;
3551
3552 nsIntRect intSubArea = subArea.ToOutsidePixels(AppUnitsPerCSSPixel());
3553 result &= mImageRenderer.DrawBorderImageComponent(
3554 aPresContext, aRenderingContext, aDirtyRect, destArea,
3555 CSSIntRect(intSubArea.x, intSubArea.y, intSubArea.width,
3556 intSubArea.height),
3557 fillStyleH, fillStyleV, unitSize, j * (RIGHT + 1) + i,
3558 svgViewportSize, hasIntrinsicRatio);
3559 }
3560 }
3561
3562 return result;
3563 }
3564
CreateWebRenderCommands(nsDisplayItem * aItem,nsIFrame * aForFrame,mozilla::wr::DisplayListBuilder & aBuilder,mozilla::wr::IpcResourceUpdateQueue & aResources,const mozilla::layers::StackingContextHelper & aSc,mozilla::layers::RenderRootStateManager * aManager,nsDisplayListBuilder * aDisplayListBuilder)3565 ImgDrawResult nsCSSBorderImageRenderer::CreateWebRenderCommands(
3566 nsDisplayItem* aItem, nsIFrame* aForFrame,
3567 mozilla::wr::DisplayListBuilder& aBuilder,
3568 mozilla::wr::IpcResourceUpdateQueue& aResources,
3569 const mozilla::layers::StackingContextHelper& aSc,
3570 mozilla::layers::RenderRootStateManager* aManager,
3571 nsDisplayListBuilder* aDisplayListBuilder) {
3572 if (!mImageRenderer.IsReady()) {
3573 return ImgDrawResult::NOT_READY;
3574 }
3575
3576 float widths[4];
3577 float slice[4];
3578 float outset[4];
3579 const int32_t appUnitsPerDevPixel =
3580 aForFrame->PresContext()->AppUnitsPerDevPixel();
3581 for (const auto i : mozilla::AllPhysicalSides()) {
3582 slice[i] = (float)(mSlice.Side(i)) / appUnitsPerDevPixel;
3583 widths[i] = (float)(mWidths.Side(i)) / appUnitsPerDevPixel;
3584
3585 // The outset is already taken into account by the adjustments to mArea
3586 // in our constructor. We use mArea as our dest rect so we can just supply
3587 // zero outsets to WebRender.
3588 outset[i] = 0.0f;
3589 }
3590
3591 LayoutDeviceRect destRect =
3592 LayoutDeviceRect::FromAppUnits(mArea, appUnitsPerDevPixel);
3593 destRect.Round();
3594 wr::LayoutRect dest = wr::ToLayoutRect(destRect);
3595
3596 wr::LayoutRect clip = dest;
3597 if (!mClip.IsEmpty()) {
3598 LayoutDeviceRect clipRect =
3599 LayoutDeviceRect::FromAppUnits(mClip, appUnitsPerDevPixel);
3600 clip = wr::ToLayoutRect(clipRect);
3601 }
3602
3603 ImgDrawResult drawResult = ImgDrawResult::SUCCESS;
3604 switch (mImageRenderer.GetType()) {
3605 case StyleImage::Tag::Rect:
3606 case StyleImage::Tag::Url: {
3607 RefPtr<imgIContainer> img = mImageRenderer.GetImage();
3608 if (!img || img->GetType() == imgIContainer::TYPE_VECTOR) {
3609 // Vector images will redraw each segment of the border up to 8 times.
3610 // We draw using a restricted region derived from the segment's clip and
3611 // scale the image accordingly (see ClippedImage::Draw). If we follow
3612 // this convention as is for WebRender, we will need to rasterize the
3613 // entire vector image scaled up without the restriction region, which
3614 // means our main thread CPU and memory footprints will be much higher.
3615 // Ideally we would be able to provide a raster image for each segment
3616 // of the border. For now we use fallback.
3617 return ImgDrawResult::NOT_SUPPORTED;
3618 }
3619
3620 uint32_t flags = aDisplayListBuilder->GetImageDecodeFlags();
3621
3622 LayoutDeviceRect imageRect = LayoutDeviceRect::FromAppUnits(
3623 nsRect(nsPoint(), mImageRenderer.GetSize()), appUnitsPerDevPixel);
3624
3625 Maybe<SVGImageContext> svgContext;
3626 Maybe<ImageIntRegion> region;
3627 gfx::IntSize decodeSize =
3628 nsLayoutUtils::ComputeImageContainerDrawingParameters(
3629 img, aForFrame, imageRect, imageRect, aSc, flags, svgContext,
3630 region);
3631
3632 RefPtr<WebRenderImageProvider> provider;
3633 drawResult = img->GetImageProvider(aManager->LayerManager(), decodeSize,
3634 svgContext, region, flags,
3635 getter_AddRefs(provider));
3636
3637 Maybe<wr::ImageKey> key =
3638 aManager->CommandBuilder().CreateImageProviderKey(
3639 aItem, provider, drawResult, aResources);
3640 if (key.isNothing()) {
3641 break;
3642 }
3643
3644 auto rendering =
3645 wr::ToImageRendering(aItem->Frame()->UsedImageRendering());
3646 if (mFill) {
3647 float epsilon = 0.0001;
3648 bool noVerticalBorders = widths[0] <= epsilon && widths[2] < epsilon;
3649 bool noHorizontalBorders = widths[1] <= epsilon && widths[3] < epsilon;
3650
3651 // Border image with no border. It's a little silly but WebRender
3652 // currently does not handle this. We could fall back to a blob image
3653 // but there are reftests that are sensible to the test going through a
3654 // blob while the reference doesn't.
3655 if (noVerticalBorders && noHorizontalBorders) {
3656 aBuilder.PushImage(dest, clip, !aItem->BackfaceIsHidden(), false,
3657 rendering, key.value());
3658 break;
3659 }
3660
3661 // Fall-back if we want to fill the middle area and opposite edges are
3662 // both empty.
3663 // TODO(bug 1609893): moving some of the repetition handling code out
3664 // of the image shader will make it easier to handle these cases
3665 // properly.
3666 if (noHorizontalBorders || noVerticalBorders) {
3667 return ImgDrawResult::NOT_SUPPORTED;
3668 }
3669 }
3670
3671 wr::WrBorderImage params{
3672 wr::ToBorderWidths(widths[0], widths[1], widths[2], widths[3]),
3673 key.value(),
3674 rendering,
3675 mImageSize.width / appUnitsPerDevPixel,
3676 mImageSize.height / appUnitsPerDevPixel,
3677 mFill,
3678 wr::ToDeviceIntSideOffsets(slice[0], slice[1], slice[2], slice[3]),
3679 wr::ToLayoutSideOffsets(outset[0], outset[1], outset[2], outset[3]),
3680 wr::ToRepeatMode(mRepeatModeHorizontal),
3681 wr::ToRepeatMode(mRepeatModeVertical)};
3682
3683 aBuilder.PushBorderImage(dest, clip, !aItem->BackfaceIsHidden(), params);
3684 break;
3685 }
3686 case StyleImage::Tag::Gradient: {
3687 const StyleGradient& gradient = *mImageRenderer.GetGradientData();
3688 nsCSSGradientRenderer renderer = nsCSSGradientRenderer::Create(
3689 aForFrame->PresContext(), aForFrame->Style(), gradient, mImageSize);
3690
3691 wr::ExtendMode extendMode;
3692 nsTArray<wr::GradientStop> stops;
3693 LayoutDevicePoint lineStart;
3694 LayoutDevicePoint lineEnd;
3695 LayoutDeviceSize gradientRadius;
3696 LayoutDevicePoint gradientCenter;
3697 float gradientAngle;
3698 renderer.BuildWebRenderParameters(1.0, extendMode, stops, lineStart,
3699 lineEnd, gradientRadius, gradientCenter,
3700 gradientAngle);
3701
3702 if (gradient.IsLinear()) {
3703 LayoutDevicePoint startPoint =
3704 LayoutDevicePoint(dest.min.x, dest.min.y) + lineStart;
3705 LayoutDevicePoint endPoint =
3706 LayoutDevicePoint(dest.min.x, dest.min.y) + lineEnd;
3707
3708 aBuilder.PushBorderGradient(
3709 dest, clip, !aItem->BackfaceIsHidden(),
3710 wr::ToBorderWidths(widths[0], widths[1], widths[2], widths[3]),
3711 (float)(mImageSize.width) / appUnitsPerDevPixel,
3712 (float)(mImageSize.height) / appUnitsPerDevPixel, mFill,
3713 wr::ToDeviceIntSideOffsets(slice[0], slice[1], slice[2], slice[3]),
3714 wr::ToLayoutPoint(startPoint), wr::ToLayoutPoint(endPoint), stops,
3715 extendMode,
3716 wr::ToLayoutSideOffsets(outset[0], outset[1], outset[2],
3717 outset[3]));
3718 } else if (gradient.IsRadial()) {
3719 aBuilder.PushBorderRadialGradient(
3720 dest, clip, !aItem->BackfaceIsHidden(),
3721 wr::ToBorderWidths(widths[0], widths[1], widths[2], widths[3]),
3722 mFill, wr::ToLayoutPoint(lineStart),
3723 wr::ToLayoutSize(gradientRadius), stops, extendMode,
3724 wr::ToLayoutSideOffsets(outset[0], outset[1], outset[2],
3725 outset[3]));
3726 } else {
3727 MOZ_ASSERT(gradient.IsConic());
3728 aBuilder.PushBorderConicGradient(
3729 dest, clip, !aItem->BackfaceIsHidden(),
3730 wr::ToBorderWidths(widths[0], widths[1], widths[2], widths[3]),
3731 mFill, wr::ToLayoutPoint(gradientCenter), gradientAngle, stops,
3732 extendMode,
3733 wr::ToLayoutSideOffsets(outset[0], outset[1], outset[2],
3734 outset[3]));
3735 }
3736 break;
3737 }
3738 default:
3739 MOZ_ASSERT_UNREACHABLE("Unsupport border image type");
3740 drawResult = ImgDrawResult::NOT_SUPPORTED;
3741 }
3742
3743 return drawResult;
3744 }
3745
nsCSSBorderImageRenderer(const nsCSSBorderImageRenderer & aRhs)3746 nsCSSBorderImageRenderer::nsCSSBorderImageRenderer(
3747 const nsCSSBorderImageRenderer& aRhs)
3748 : mImageRenderer(aRhs.mImageRenderer),
3749 mImageSize(aRhs.mImageSize),
3750 mSlice(aRhs.mSlice),
3751 mWidths(aRhs.mWidths),
3752 mImageOutset(aRhs.mImageOutset),
3753 mArea(aRhs.mArea),
3754 mClip(aRhs.mClip),
3755 mRepeatModeHorizontal(aRhs.mRepeatModeHorizontal),
3756 mRepeatModeVertical(aRhs.mRepeatModeVertical),
3757 mFill(aRhs.mFill) {
3758 Unused << mImageRenderer.PrepareResult();
3759 }
3760
operator =(const nsCSSBorderImageRenderer & aRhs)3761 nsCSSBorderImageRenderer& nsCSSBorderImageRenderer::operator=(
3762 const nsCSSBorderImageRenderer& aRhs) {
3763 mImageRenderer = aRhs.mImageRenderer;
3764 mImageSize = aRhs.mImageSize;
3765 mSlice = aRhs.mSlice;
3766 mWidths = aRhs.mWidths;
3767 mImageOutset = aRhs.mImageOutset;
3768 mArea = aRhs.mArea;
3769 mClip = aRhs.mClip;
3770 mRepeatModeHorizontal = aRhs.mRepeatModeHorizontal;
3771 mRepeatModeVertical = aRhs.mRepeatModeVertical;
3772 mFill = aRhs.mFill;
3773 Unused << mImageRenderer.PrepareResult();
3774
3775 return *this;
3776 }
3777
nsCSSBorderImageRenderer(nsIFrame * aForFrame,const nsRect & aBorderArea,const nsStyleBorder & aStyleBorder,Sides aSkipSides,const nsImageRenderer & aImageRenderer)3778 nsCSSBorderImageRenderer::nsCSSBorderImageRenderer(
3779 nsIFrame* aForFrame, const nsRect& aBorderArea,
3780 const nsStyleBorder& aStyleBorder, Sides aSkipSides,
3781 const nsImageRenderer& aImageRenderer)
3782 : mImageRenderer(aImageRenderer) {
3783 // Determine the border image area, which by default corresponds to the
3784 // border box but can be modified by 'border-image-outset'.
3785 // Note that 'border-radius' do not apply to 'border-image' borders per
3786 // <http://dev.w3.org/csswg/css-backgrounds/#corner-clipping>.
3787 nsMargin borderWidths(aStyleBorder.GetComputedBorder());
3788 mImageOutset = aStyleBorder.GetImageOutset();
3789 if (nsCSSRendering::IsBoxDecorationSlice(aStyleBorder) &&
3790 !aSkipSides.IsEmpty()) {
3791 mArea = nsCSSRendering::BoxDecorationRectForBorder(
3792 aForFrame, aBorderArea, aSkipSides, &aStyleBorder);
3793 if (mArea.IsEqualEdges(aBorderArea)) {
3794 // No need for a clip, just skip the sides we don't want.
3795 borderWidths.ApplySkipSides(aSkipSides);
3796 mImageOutset.ApplySkipSides(aSkipSides);
3797 mArea.Inflate(mImageOutset);
3798 } else {
3799 // We're drawing borders around the joined continuation boxes so we need
3800 // to clip that to the slice that we want for this frame.
3801 mArea.Inflate(mImageOutset);
3802 mImageOutset.ApplySkipSides(aSkipSides);
3803 mClip = aBorderArea;
3804 mClip.Inflate(mImageOutset);
3805 }
3806 } else {
3807 mArea = aBorderArea;
3808 mArea.Inflate(mImageOutset);
3809 }
3810
3811 // Calculate the image size used to compute slice points.
3812 CSSSizeOrRatio intrinsicSize = mImageRenderer.ComputeIntrinsicSize();
3813 mImageSize = nsImageRenderer::ComputeConcreteSize(
3814 CSSSizeOrRatio(), intrinsicSize, mArea.Size());
3815 mImageRenderer.SetPreferredSize(intrinsicSize, mImageSize);
3816
3817 // Compute the used values of 'border-image-slice' and 'border-image-width';
3818 // we do them together because the latter can depend on the former.
3819 nsMargin slice;
3820 nsMargin border;
3821 for (const auto s : mozilla::AllPhysicalSides()) {
3822 const auto& slice = aStyleBorder.mBorderImageSlice.offsets.Get(s);
3823 int32_t imgDimension =
3824 SideIsVertical(s) ? mImageSize.width : mImageSize.height;
3825 nscoord borderDimension = SideIsVertical(s) ? mArea.width : mArea.height;
3826 double value;
3827 if (slice.IsNumber()) {
3828 value = nsPresContext::CSSPixelsToAppUnits(NS_lround(slice.AsNumber()));
3829 } else {
3830 MOZ_ASSERT(slice.IsPercentage());
3831 value = slice.AsPercentage()._0 * imgDimension;
3832 }
3833 if (value < 0) {
3834 value = 0;
3835 }
3836 if (value > imgDimension) {
3837 value = imgDimension;
3838 }
3839 mSlice.Side(s) = value;
3840
3841 const auto& width = aStyleBorder.mBorderImageWidth.Get(s);
3842 switch (width.tag) {
3843 case StyleBorderImageSideWidth::Tag::LengthPercentage:
3844 value =
3845 std::max(0, width.AsLengthPercentage().Resolve(borderDimension));
3846 break;
3847 case StyleBorderImageSideWidth::Tag::Number:
3848 value = width.AsNumber() * borderWidths.Side(s);
3849 break;
3850 case StyleBorderImageSideWidth::Tag::Auto:
3851 value = mSlice.Side(s);
3852 break;
3853 default:
3854 MOZ_ASSERT_UNREACHABLE("unexpected CSS unit for border image area");
3855 value = 0;
3856 break;
3857 }
3858 // NSToCoordRoundWithClamp rounds towards infinity, but that's OK
3859 // because we expect value to be non-negative.
3860 MOZ_ASSERT(value >= 0);
3861 mWidths.Side(s) = NSToCoordRoundWithClamp(value);
3862 MOZ_ASSERT(mWidths.Side(s) >= 0);
3863 }
3864
3865 // "If two opposite border-image-width offsets are large enough that they
3866 // overlap, their used values are proportionately reduced until they no
3867 // longer overlap."
3868 uint32_t combinedBorderWidth =
3869 uint32_t(mWidths.left) + uint32_t(mWidths.right);
3870 double scaleX = combinedBorderWidth > uint32_t(mArea.width)
3871 ? mArea.width / double(combinedBorderWidth)
3872 : 1.0;
3873 uint32_t combinedBorderHeight =
3874 uint32_t(mWidths.top) + uint32_t(mWidths.bottom);
3875 double scaleY = combinedBorderHeight > uint32_t(mArea.height)
3876 ? mArea.height / double(combinedBorderHeight)
3877 : 1.0;
3878 double scale = std::min(scaleX, scaleY);
3879 if (scale < 1.0) {
3880 mWidths.left *= scale;
3881 mWidths.right *= scale;
3882 mWidths.top *= scale;
3883 mWidths.bottom *= scale;
3884 NS_ASSERTION(mWidths.left + mWidths.right <= mArea.width &&
3885 mWidths.top + mWidths.bottom <= mArea.height,
3886 "rounding error in width reduction???");
3887 }
3888
3889 mRepeatModeHorizontal = aStyleBorder.mBorderImageRepeatH;
3890 mRepeatModeVertical = aStyleBorder.mBorderImageRepeatV;
3891 mFill = aStyleBorder.mBorderImageSlice.fill;
3892 }
3893