1 /*
2 * Copyright 2016 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "include/core/SkOverdrawCanvas.h"
9
10 #include "include/core/SkColorFilter.h"
11 #include "include/core/SkDrawable.h"
12 #include "include/core/SkPath.h"
13 #include "include/core/SkRRect.h"
14 #include "include/core/SkRSXform.h"
15 #include "include/core/SkTextBlob.h"
16 #include "include/private/SkTo.h"
17 #include "src/core/SkDevice.h"
18 #include "src/core/SkDrawShadowInfo.h"
19 #include "src/core/SkGlyphRunPainter.h"
20 #include "src/core/SkImagePriv.h"
21 #include "src/core/SkLatticeIter.h"
22 #include "src/core/SkStrikeCache.h"
23 #include "src/core/SkTextBlobPriv.h"
24 #include "src/utils/SkPatchUtils.h"
25
SkOverdrawCanvas(SkCanvas * canvas)26 SkOverdrawCanvas::SkOverdrawCanvas(SkCanvas* canvas)
27 : INHERITED(canvas->onImageInfo().width(), canvas->onImageInfo().height())
28 {
29 // Non-drawing calls that SkOverdrawCanvas does not override (translate, save, etc.)
30 // will pass through to the input canvas.
31 this->addCanvas(canvas);
32
33 static constexpr float kIncrementAlpha[] = {
34 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
35 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
36 0.0f, 0.0f, 0.0f, 0.0f, 0.0f,
37 0.0f, 0.0f, 0.0f, 0.0f, 1.0f/255,
38 };
39
40 fPaint.setAntiAlias(false);
41 fPaint.setBlendMode(SkBlendMode::kPlus);
42 fPaint.setColorFilter(SkColorFilters::Matrix(kIncrementAlpha));
43 }
44
45 namespace {
46 class TextDevice : public SkNoPixelsDevice, public SkGlyphRunListPainter::BitmapDevicePainter {
47 public:
TextDevice(SkCanvas * overdrawCanvas,const SkSurfaceProps & props)48 TextDevice(SkCanvas* overdrawCanvas, const SkSurfaceProps& props)
49 : SkNoPixelsDevice{SkIRect::MakeWH(32767, 32767), props},
50 fOverdrawCanvas{overdrawCanvas},
51 fPainter{props, kN32_SkColorType, nullptr, SkStrikeCache::GlobalStrikeCache()} {}
52
paintPaths(SkDrawableGlyphBuffer *,SkScalar scale,const SkPaint & paint) const53 void paintPaths(SkDrawableGlyphBuffer*, SkScalar scale, const SkPaint& paint) const override {}
54
paintMasks(SkDrawableGlyphBuffer * drawables,const SkPaint & paint) const55 void paintMasks(SkDrawableGlyphBuffer* drawables, const SkPaint& paint) const override {
56 for (auto t : drawables->drawable()) {
57 SkGlyphVariant glyph; SkPoint pos;
58 std::tie(glyph, pos) = t;
59 SkMask mask = glyph.glyph()->mask(pos);
60 fOverdrawCanvas->drawRect(SkRect::Make(mask.fBounds), SkPaint());
61 }
62 }
63
64 protected:
drawGlyphRunList(const SkGlyphRunList & glyphRunList)65 void drawGlyphRunList(const SkGlyphRunList& glyphRunList) override {
66 fPainter.drawForBitmapDevice(glyphRunList, fOverdrawCanvas->getTotalMatrix(), this);
67 }
68
69 private:
70 SkCanvas* const fOverdrawCanvas;
71 SkGlyphRunListPainter fPainter;
72 };
73 } // namespace
74
onDrawTextBlob(const SkTextBlob * blob,SkScalar x,SkScalar y,const SkPaint & paint)75 void SkOverdrawCanvas::onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
76 const SkPaint& paint) {
77 SkGlyphRunBuilder b;
78 SkSurfaceProps props{0, kUnknown_SkPixelGeometry};
79 this->getProps(&props);
80 TextDevice device{this, props};
81
82 b.drawTextBlob(paint, *blob, {x, y}, &device);
83 }
84
onDrawPatch(const SkPoint cubics[12],const SkColor colors[4],const SkPoint texCoords[4],SkBlendMode blendMode,const SkPaint &)85 void SkOverdrawCanvas::onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
86 const SkPoint texCoords[4], SkBlendMode blendMode,
87 const SkPaint&) {
88 fList[0]->onDrawPatch(cubics, colors, texCoords, blendMode, fPaint);
89 }
90
onDrawPaint(const SkPaint & paint)91 void SkOverdrawCanvas::onDrawPaint(const SkPaint& paint) {
92 if (0 == paint.getColor() && !paint.getColorFilter() && !paint.getShader()) {
93 // This is a clear, ignore it.
94 } else {
95 fList[0]->onDrawPaint(this->overdrawPaint(paint));
96 }
97 }
98
onDrawBehind(const SkPaint & paint)99 void SkOverdrawCanvas::onDrawBehind(const SkPaint& paint) {
100 fList[0]->onDrawBehind(this->overdrawPaint(paint));
101 }
102
onDrawRect(const SkRect & rect,const SkPaint & paint)103 void SkOverdrawCanvas::onDrawRect(const SkRect& rect, const SkPaint& paint) {
104 fList[0]->onDrawRect(rect, this->overdrawPaint(paint));
105 }
106
onDrawRegion(const SkRegion & region,const SkPaint & paint)107 void SkOverdrawCanvas::onDrawRegion(const SkRegion& region, const SkPaint& paint) {
108 fList[0]->onDrawRegion(region, this->overdrawPaint(paint));
109 }
110
onDrawOval(const SkRect & oval,const SkPaint & paint)111 void SkOverdrawCanvas::onDrawOval(const SkRect& oval, const SkPaint& paint) {
112 fList[0]->onDrawOval(oval, this->overdrawPaint(paint));
113 }
114
onDrawArc(const SkRect & arc,SkScalar startAngle,SkScalar sweepAngle,bool useCenter,const SkPaint & paint)115 void SkOverdrawCanvas::onDrawArc(const SkRect& arc, SkScalar startAngle, SkScalar sweepAngle,
116 bool useCenter, const SkPaint& paint) {
117 fList[0]->onDrawArc(arc, startAngle, sweepAngle, useCenter, this->overdrawPaint(paint));
118 }
119
onDrawDRRect(const SkRRect & outer,const SkRRect & inner,const SkPaint & paint)120 void SkOverdrawCanvas::onDrawDRRect(const SkRRect& outer, const SkRRect& inner,
121 const SkPaint& paint) {
122 fList[0]->onDrawDRRect(outer, inner, this->overdrawPaint(paint));
123 }
124
onDrawRRect(const SkRRect & rect,const SkPaint & paint)125 void SkOverdrawCanvas::onDrawRRect(const SkRRect& rect, const SkPaint& paint) {
126 fList[0]->onDrawRRect(rect, this->overdrawPaint(paint));
127 }
128
onDrawPoints(PointMode mode,size_t count,const SkPoint points[],const SkPaint & paint)129 void SkOverdrawCanvas::onDrawPoints(PointMode mode, size_t count, const SkPoint points[],
130 const SkPaint& paint) {
131 fList[0]->onDrawPoints(mode, count, points, this->overdrawPaint(paint));
132 }
133
onDrawVerticesObject(const SkVertices * vertices,const SkVertices::Bone bones[],int boneCount,SkBlendMode blendMode,const SkPaint & paint)134 void SkOverdrawCanvas::onDrawVerticesObject(const SkVertices* vertices,
135 const SkVertices::Bone bones[], int boneCount,
136 SkBlendMode blendMode, const SkPaint& paint) {
137 fList[0]->onDrawVerticesObject(vertices,
138 bones,
139 boneCount,
140 blendMode,
141 this->overdrawPaint(paint));
142 }
143
onDrawAtlas(const SkImage * image,const SkRSXform xform[],const SkRect texs[],const SkColor colors[],int count,SkBlendMode mode,const SkRect * cull,const SkPaint * paint)144 void SkOverdrawCanvas::onDrawAtlas(const SkImage* image, const SkRSXform xform[],
145 const SkRect texs[], const SkColor colors[], int count,
146 SkBlendMode mode, const SkRect* cull, const SkPaint* paint) {
147 SkPaint* paintPtr = &fPaint;
148 SkPaint storage;
149 if (paint) {
150 storage = this->overdrawPaint(*paint);
151 paintPtr = &storage;
152 }
153
154 fList[0]->onDrawAtlas(image, xform, texs, colors, count, mode, cull, paintPtr);
155 }
156
onDrawPath(const SkPath & path,const SkPaint & paint)157 void SkOverdrawCanvas::onDrawPath(const SkPath& path, const SkPaint& paint) {
158 fList[0]->onDrawPath(path, fPaint);
159 }
160
onDrawImage(const SkImage * image,SkScalar x,SkScalar y,const SkPaint *)161 void SkOverdrawCanvas::onDrawImage(const SkImage* image, SkScalar x, SkScalar y, const SkPaint*) {
162 fList[0]->onDrawRect(SkRect::MakeXYWH(x, y, image->width(), image->height()), fPaint);
163 }
164
onDrawImageRect(const SkImage * image,const SkRect * src,const SkRect & dst,const SkPaint *,SrcRectConstraint)165 void SkOverdrawCanvas::onDrawImageRect(const SkImage* image, const SkRect* src, const SkRect& dst,
166 const SkPaint*, SrcRectConstraint) {
167 fList[0]->onDrawRect(dst, fPaint);
168 }
169
onDrawImageNine(const SkImage *,const SkIRect &,const SkRect & dst,const SkPaint *)170 void SkOverdrawCanvas::onDrawImageNine(const SkImage*, const SkIRect&, const SkRect& dst,
171 const SkPaint*) {
172 fList[0]->onDrawRect(dst, fPaint);
173 }
174
onDrawImageLattice(const SkImage * image,const Lattice & lattice,const SkRect & dst,const SkPaint *)175 void SkOverdrawCanvas::onDrawImageLattice(const SkImage* image, const Lattice& lattice,
176 const SkRect& dst, const SkPaint*) {
177 SkIRect bounds;
178 Lattice latticePlusBounds = lattice;
179 if (!latticePlusBounds.fBounds) {
180 bounds = SkIRect::MakeWH(image->width(), image->height());
181 latticePlusBounds.fBounds = &bounds;
182 }
183
184 if (SkLatticeIter::Valid(image->width(), image->height(), latticePlusBounds)) {
185 SkLatticeIter iter(latticePlusBounds, dst);
186
187 SkRect dummy, iterDst;
188 while (iter.next(&dummy, &iterDst)) {
189 fList[0]->onDrawRect(iterDst, fPaint);
190 }
191 } else {
192 fList[0]->onDrawRect(dst, fPaint);
193 }
194 }
195
onDrawBitmap(const SkBitmap & bitmap,SkScalar x,SkScalar y,const SkPaint *)196 void SkOverdrawCanvas::onDrawBitmap(const SkBitmap& bitmap, SkScalar x, SkScalar y,
197 const SkPaint*) {
198 fList[0]->onDrawRect(SkRect::MakeXYWH(x, y, bitmap.width(), bitmap.height()), fPaint);
199 }
200
onDrawBitmapRect(const SkBitmap &,const SkRect *,const SkRect & dst,const SkPaint *,SrcRectConstraint)201 void SkOverdrawCanvas::onDrawBitmapRect(const SkBitmap&, const SkRect*, const SkRect& dst,
202 const SkPaint*, SrcRectConstraint) {
203 fList[0]->onDrawRect(dst, fPaint);
204 }
205
onDrawBitmapNine(const SkBitmap &,const SkIRect &,const SkRect & dst,const SkPaint *)206 void SkOverdrawCanvas::onDrawBitmapNine(const SkBitmap&, const SkIRect&, const SkRect& dst,
207 const SkPaint*) {
208 fList[0]->onDrawRect(dst, fPaint);
209 }
210
onDrawBitmapLattice(const SkBitmap & bitmap,const Lattice & lattice,const SkRect & dst,const SkPaint * paint)211 void SkOverdrawCanvas::onDrawBitmapLattice(const SkBitmap& bitmap, const Lattice& lattice,
212 const SkRect& dst, const SkPaint* paint) {
213 sk_sp<SkImage> image = SkMakeImageFromRasterBitmap(bitmap, kNever_SkCopyPixelsMode);
214 this->onDrawImageLattice(image.get(), lattice, dst, paint);
215 }
216
onDrawDrawable(SkDrawable * drawable,const SkMatrix * matrix)217 void SkOverdrawCanvas::onDrawDrawable(SkDrawable* drawable, const SkMatrix* matrix) {
218 drawable->draw(this, matrix);
219 }
220
onDrawPicture(const SkPicture *,const SkMatrix *,const SkPaint *)221 void SkOverdrawCanvas::onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*) {
222 SkASSERT(false);
223 return;
224 }
225
onDrawAnnotation(const SkRect &,const char[],SkData *)226 void SkOverdrawCanvas::onDrawAnnotation(const SkRect&, const char[], SkData*) {}
227
onDrawShadowRec(const SkPath & path,const SkDrawShadowRec & rec)228 void SkOverdrawCanvas::onDrawShadowRec(const SkPath& path, const SkDrawShadowRec& rec) {
229 SkRect bounds;
230 SkDrawShadowMetrics::GetLocalBounds(path, rec, this->getTotalMatrix(), &bounds);
231 fList[0]->onDrawRect(bounds, fPaint);
232 }
233
onDrawEdgeAAQuad(const SkRect & rect,const SkPoint clip[4],QuadAAFlags aa,const SkColor4f & color,SkBlendMode mode)234 void SkOverdrawCanvas::onDrawEdgeAAQuad(const SkRect& rect, const SkPoint clip[4],
235 QuadAAFlags aa, const SkColor4f& color, SkBlendMode mode) {
236 if (clip) {
237 SkPath path;
238 path.addPoly(clip, 4, true);
239 fList[0]->onDrawPath(path, fPaint);
240 } else {
241 fList[0]->onDrawRect(rect, fPaint);
242 }
243 }
244
onDrawEdgeAAImageSet(const ImageSetEntry set[],int count,const SkPoint dstClips[],const SkMatrix preViewMatrices[],const SkPaint * paint,SrcRectConstraint constraint)245 void SkOverdrawCanvas::onDrawEdgeAAImageSet(const ImageSetEntry set[], int count,
246 const SkPoint dstClips[],
247 const SkMatrix preViewMatrices[], const SkPaint* paint,
248 SrcRectConstraint constraint) {
249 int clipIndex = 0;
250 for (int i = 0; i < count; ++i) {
251 if (set[i].fMatrixIndex >= 0) {
252 fList[0]->save();
253 fList[0]->concat(preViewMatrices[set[i].fMatrixIndex]);
254 }
255 if (set[i].fHasClip) {
256 SkPath path;
257 path.addPoly(dstClips + clipIndex, 4, true);
258 clipIndex += 4;
259 fList[0]->onDrawPath(path, fPaint);
260 } else {
261 fList[0]->onDrawRect(set[i].fDstRect, fPaint);
262 }
263 if (set[i].fMatrixIndex >= 0) {
264 fList[0]->restore();
265 }
266 }
267 }
268
overdrawPaint(const SkPaint & paint)269 inline SkPaint SkOverdrawCanvas::overdrawPaint(const SkPaint& paint) {
270 SkPaint newPaint = fPaint;
271 newPaint.setStyle(paint.getStyle());
272 newPaint.setStrokeWidth(paint.getStrokeWidth());
273 return newPaint;
274 }
275