1 /*
2 * Copyright 2014 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 "src/gpu/effects/GrRRectEffect.h"
9
10 #include "src/core/SkRRectPriv.h"
11 #include "src/core/SkTLazy.h"
12 #include "src/gpu/GrFragmentProcessor.h"
13 #include "src/gpu/GrShaderCaps.h"
14 #include "src/gpu/effects/GrConvexPolyEffect.h"
15 #include "src/gpu/effects/GrOvalEffect.h"
16 #include "src/gpu/glsl/GrGLSLFragmentProcessor.h"
17 #include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h"
18 #include "src/gpu/glsl/GrGLSLProgramDataManager.h"
19 #include "src/gpu/glsl/GrGLSLUniformHandler.h"
20
21 // The effects defined here only handle rrect radii >= kRadiusMin.
22 static const SkScalar kRadiusMin = SK_ScalarHalf;
23
24 //////////////////////////////////////////////////////////////////////////////
25
26 class CircularRRectEffect : public GrFragmentProcessor {
27 public:
28
29 enum CornerFlags {
30 kTopLeft_CornerFlag = (1 << SkRRect::kUpperLeft_Corner),
31 kTopRight_CornerFlag = (1 << SkRRect::kUpperRight_Corner),
32 kBottomRight_CornerFlag = (1 << SkRRect::kLowerRight_Corner),
33 kBottomLeft_CornerFlag = (1 << SkRRect::kLowerLeft_Corner),
34
35 kLeft_CornerFlags = kTopLeft_CornerFlag | kBottomLeft_CornerFlag,
36 kTop_CornerFlags = kTopLeft_CornerFlag | kTopRight_CornerFlag,
37 kRight_CornerFlags = kTopRight_CornerFlag | kBottomRight_CornerFlag,
38 kBottom_CornerFlags = kBottomLeft_CornerFlag | kBottomRight_CornerFlag,
39
40 kAll_CornerFlags = kTopLeft_CornerFlag | kTopRight_CornerFlag |
41 kBottomLeft_CornerFlag | kBottomRight_CornerFlag,
42
43 kNone_CornerFlags = 0
44 };
45
46 // The flags are used to indicate which corners are circluar (unflagged corners are assumed to
47 // be square).
48 static std::unique_ptr<GrFragmentProcessor> Make(GrClipEdgeType,
49 uint32_t circularCornerFlags, const SkRRect&);
50
~CircularRRectEffect()51 ~CircularRRectEffect() override {}
52
name() const53 const char* name() const override { return "CircularRRect"; }
54
55 std::unique_ptr<GrFragmentProcessor> clone() const override;
56
getRRect() const57 const SkRRect& getRRect() const { return fRRect; }
58
getCircularCornerFlags() const59 uint32_t getCircularCornerFlags() const { return fCircularCornerFlags; }
60
getEdgeType() const61 GrClipEdgeType getEdgeType() const { return fEdgeType; }
62
63 private:
64 CircularRRectEffect(GrClipEdgeType, uint32_t circularCornerFlags, const SkRRect&);
65
66 GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
67
68 void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override;
69
70 bool onIsEqual(const GrFragmentProcessor& other) const override;
71
72 SkRRect fRRect;
73 GrClipEdgeType fEdgeType;
74 uint32_t fCircularCornerFlags;
75
76 GR_DECLARE_FRAGMENT_PROCESSOR_TEST
77
78 typedef GrFragmentProcessor INHERITED;
79 };
80
Make(GrClipEdgeType edgeType,uint32_t circularCornerFlags,const SkRRect & rrect)81 std::unique_ptr<GrFragmentProcessor> CircularRRectEffect::Make(GrClipEdgeType edgeType,
82 uint32_t circularCornerFlags,
83 const SkRRect& rrect) {
84 if (GrClipEdgeType::kFillAA != edgeType && GrClipEdgeType::kInverseFillAA != edgeType) {
85 return nullptr;
86 }
87 return std::unique_ptr<GrFragmentProcessor>(
88 new CircularRRectEffect(edgeType, circularCornerFlags, rrect));
89 }
90
CircularRRectEffect(GrClipEdgeType edgeType,uint32_t circularCornerFlags,const SkRRect & rrect)91 CircularRRectEffect::CircularRRectEffect(GrClipEdgeType edgeType, uint32_t circularCornerFlags,
92 const SkRRect& rrect)
93 : INHERITED(kCircularRRectEffect_ClassID, kCompatibleWithCoverageAsAlpha_OptimizationFlag)
94 , fRRect(rrect)
95 , fEdgeType(edgeType)
96 , fCircularCornerFlags(circularCornerFlags) {
97 }
98
clone() const99 std::unique_ptr<GrFragmentProcessor> CircularRRectEffect::clone() const {
100 return std::unique_ptr<GrFragmentProcessor>(
101 new CircularRRectEffect(fEdgeType, fCircularCornerFlags, fRRect));
102 }
103
onIsEqual(const GrFragmentProcessor & other) const104 bool CircularRRectEffect::onIsEqual(const GrFragmentProcessor& other) const {
105 const CircularRRectEffect& crre = other.cast<CircularRRectEffect>();
106 // The corner flags are derived from fRRect, so no need to check them.
107 return fEdgeType == crre.fEdgeType && fRRect == crre.fRRect;
108 }
109
110 //////////////////////////////////////////////////////////////////////////////
111
112 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(CircularRRectEffect);
113
114 #if GR_TEST_UTILS
TestCreate(GrProcessorTestData * d)115 std::unique_ptr<GrFragmentProcessor> CircularRRectEffect::TestCreate(GrProcessorTestData* d) {
116 SkScalar w = d->fRandom->nextRangeScalar(20.f, 1000.f);
117 SkScalar h = d->fRandom->nextRangeScalar(20.f, 1000.f);
118 SkScalar r = d->fRandom->nextRangeF(kRadiusMin, 9.f);
119 SkRRect rrect;
120 rrect.setRectXY(SkRect::MakeWH(w, h), r, r);
121 std::unique_ptr<GrFragmentProcessor> fp;
122 do {
123 GrClipEdgeType et =
124 (GrClipEdgeType)d->fRandom->nextULessThan(kGrClipEdgeTypeCnt);
125 fp = GrRRectEffect::Make(et, rrect, *d->caps()->shaderCaps());
126 } while (nullptr == fp);
127 return fp;
128 }
129 #endif
130
131 //////////////////////////////////////////////////////////////////////////////
132
133 class GLCircularRRectEffect : public GrGLSLFragmentProcessor {
134 public:
135 GLCircularRRectEffect() = default;
136
137 virtual void emitCode(EmitArgs&) override;
138
139 static inline void GenKey(const GrProcessor&, const GrShaderCaps&, GrProcessorKeyBuilder*);
140
141 protected:
142 void onSetData(const GrGLSLProgramDataManager&, const GrFragmentProcessor&) override;
143
144 private:
145 GrGLSLProgramDataManager::UniformHandle fInnerRectUniform;
146 GrGLSLProgramDataManager::UniformHandle fRadiusPlusHalfUniform;
147 SkRRect fPrevRRect;
148 typedef GrGLSLFragmentProcessor INHERITED;
149 };
150
emitCode(EmitArgs & args)151 void GLCircularRRectEffect::emitCode(EmitArgs& args) {
152 const CircularRRectEffect& crre = args.fFp.cast<CircularRRectEffect>();
153 GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
154 const char *rectName;
155 const char *radiusPlusHalfName;
156 // The inner rect is the rrect bounds inset by the radius. Its left, top, right, and bottom
157 // edges correspond to components x, y, z, and w, respectively. When a side of the rrect has
158 // only rectangular corners, that side's value corresponds to the rect edge's value outset by
159 // half a pixel.
160 fInnerRectUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, kFloat4_GrSLType,
161 "innerRect", &rectName);
162 // x is (r + .5) and y is 1/(r + .5)
163 fRadiusPlusHalfUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf2_GrSLType,
164 "radiusPlusHalf", &radiusPlusHalfName);
165
166 // If we're on a device where float != fp32 then the length calculation could overflow.
167 SkString clampedCircleDistance;
168 if (!args.fShaderCaps->floatIs32Bits()) {
169 clampedCircleDistance.printf("saturate(%s.x * (1.0 - length(dxy * %s.y)))",
170 radiusPlusHalfName, radiusPlusHalfName);
171 } else {
172 clampedCircleDistance.printf("saturate(%s.x - length(dxy))", radiusPlusHalfName);
173 }
174
175 GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
176 // At each quarter-circle corner we compute a vector that is the offset of the fragment position
177 // from the circle center. The vector is pinned in x and y to be in the quarter-plane relevant
178 // to that corner. This means that points near the interior near the rrect top edge will have
179 // a vector that points straight up for both the TL left and TR corners. Computing an
180 // alpha from this vector at either the TR or TL corner will give the correct result. Similarly,
181 // fragments near the other three edges will get the correct AA. Fragments in the interior of
182 // the rrect will have a (0,0) vector at all four corners. So long as the radius > 0.5 they will
183 // correctly produce an alpha value of 1 at all four corners. We take the min of all the alphas.
184 // The code below is a simplified version of the above that performs maxs on the vector
185 // components before computing distances and alpha values so that only one distance computation
186 // need be computed to determine the min alpha.
187 //
188 // For the cases where one half of the rrect is rectangular we drop one of the x or y
189 // computations, compute a separate rect edge alpha for the rect side, and mul the two computed
190 // alphas together.
191 switch (crre.getCircularCornerFlags()) {
192 case CircularRRectEffect::kAll_CornerFlags:
193 fragBuilder->codeAppendf("float2 dxy0 = %s.xy - sk_FragCoord.xy;", rectName);
194 fragBuilder->codeAppendf("float2 dxy1 = sk_FragCoord.xy - %s.zw;", rectName);
195 fragBuilder->codeAppend("float2 dxy = max(max(dxy0, dxy1), 0.0);");
196 fragBuilder->codeAppendf("half alpha = half(%s);", clampedCircleDistance.c_str());
197 break;
198 case CircularRRectEffect::kTopLeft_CornerFlag:
199 fragBuilder->codeAppendf("float2 dxy = max(%s.xy - sk_FragCoord.xy, 0.0);",
200 rectName);
201 fragBuilder->codeAppendf("half rightAlpha = half(saturate(%s.z - sk_FragCoord.x));",
202 rectName);
203 fragBuilder->codeAppendf("half bottomAlpha = half(saturate(%s.w - sk_FragCoord.y));",
204 rectName);
205 fragBuilder->codeAppendf("half alpha = bottomAlpha * rightAlpha * half(%s);",
206 clampedCircleDistance.c_str());
207 break;
208 case CircularRRectEffect::kTopRight_CornerFlag:
209 fragBuilder->codeAppendf("float2 dxy = max(float2(sk_FragCoord.x - %s.z, "
210 "%s.y - sk_FragCoord.y), 0.0);",
211 rectName, rectName);
212 fragBuilder->codeAppendf("half leftAlpha = half(saturate(sk_FragCoord.x - %s.x));",
213 rectName);
214 fragBuilder->codeAppendf("half bottomAlpha = half(saturate(%s.w - sk_FragCoord.y));",
215 rectName);
216 fragBuilder->codeAppendf("half alpha = bottomAlpha * leftAlpha * half(%s);",
217 clampedCircleDistance.c_str());
218 break;
219 case CircularRRectEffect::kBottomRight_CornerFlag:
220 fragBuilder->codeAppendf("float2 dxy = max(sk_FragCoord.xy - %s.zw, 0.0);",
221 rectName);
222 fragBuilder->codeAppendf("half leftAlpha = half(saturate(sk_FragCoord.x - %s.x));",
223 rectName);
224 fragBuilder->codeAppendf("half topAlpha = half(saturate(sk_FragCoord.y - %s.y));",
225 rectName);
226 fragBuilder->codeAppendf("half alpha = topAlpha * leftAlpha * half(%s);",
227 clampedCircleDistance.c_str());
228 break;
229 case CircularRRectEffect::kBottomLeft_CornerFlag:
230 fragBuilder->codeAppendf("float2 dxy = max(float2(%s.x - sk_FragCoord.x, "
231 "sk_FragCoord.y - %s.w), 0.0);",
232 rectName, rectName);
233 fragBuilder->codeAppendf("half rightAlpha = half(saturate(%s.z - sk_FragCoord.x));",
234 rectName);
235 fragBuilder->codeAppendf("half topAlpha = half(saturate(sk_FragCoord.y - %s.y));",
236 rectName);
237 fragBuilder->codeAppendf("half alpha = topAlpha * rightAlpha * half(%s);",
238 clampedCircleDistance.c_str());
239 break;
240 case CircularRRectEffect::kLeft_CornerFlags:
241 fragBuilder->codeAppendf("float2 dxy0 = %s.xy - sk_FragCoord.xy;", rectName);
242 fragBuilder->codeAppendf("float dy1 = sk_FragCoord.y - %s.w;", rectName);
243 fragBuilder->codeAppend("float2 dxy = max(float2(dxy0.x, max(dxy0.y, dy1)), 0.0);");
244 fragBuilder->codeAppendf("half rightAlpha = half(saturate(%s.z - sk_FragCoord.x));",
245 rectName);
246 fragBuilder->codeAppendf("half alpha = rightAlpha * half(%s);",
247 clampedCircleDistance.c_str());
248 break;
249 case CircularRRectEffect::kTop_CornerFlags:
250 fragBuilder->codeAppendf("float2 dxy0 = %s.xy - sk_FragCoord.xy;", rectName);
251 fragBuilder->codeAppendf("float dx1 = sk_FragCoord.x - %s.z;", rectName);
252 fragBuilder->codeAppend("float2 dxy = max(float2(max(dxy0.x, dx1), dxy0.y), 0.0);");
253 fragBuilder->codeAppendf("half bottomAlpha = half(saturate(%s.w - sk_FragCoord.y));",
254 rectName);
255 fragBuilder->codeAppendf("half alpha = bottomAlpha * half(%s);",
256 clampedCircleDistance.c_str());
257 break;
258 case CircularRRectEffect::kRight_CornerFlags:
259 fragBuilder->codeAppendf("float dy0 = %s.y - sk_FragCoord.y;", rectName);
260 fragBuilder->codeAppendf("float2 dxy1 = sk_FragCoord.xy - %s.zw;", rectName);
261 fragBuilder->codeAppend("float2 dxy = max(float2(dxy1.x, max(dy0, dxy1.y)), 0.0);");
262 fragBuilder->codeAppendf("half leftAlpha = half(saturate(sk_FragCoord.x - %s.x));",
263 rectName);
264 fragBuilder->codeAppendf("half alpha = leftAlpha * half(%s);",
265 clampedCircleDistance.c_str());
266 break;
267 case CircularRRectEffect::kBottom_CornerFlags:
268 fragBuilder->codeAppendf("float dx0 = %s.x - sk_FragCoord.x;", rectName);
269 fragBuilder->codeAppendf("float2 dxy1 = sk_FragCoord.xy - %s.zw;", rectName);
270 fragBuilder->codeAppend("float2 dxy = max(float2(max(dx0, dxy1.x), dxy1.y), 0.0);");
271 fragBuilder->codeAppendf("half topAlpha = half(saturate(sk_FragCoord.y - %s.y));",
272 rectName);
273 fragBuilder->codeAppendf("half alpha = topAlpha * half(%s);",
274 clampedCircleDistance.c_str());
275 break;
276 }
277
278 if (GrClipEdgeType::kInverseFillAA == crre.getEdgeType()) {
279 fragBuilder->codeAppend("alpha = 1.0 - alpha;");
280 }
281
282 fragBuilder->codeAppendf("%s = %s * alpha;", args.fOutputColor, args.fInputColor);
283 }
284
GenKey(const GrProcessor & processor,const GrShaderCaps &,GrProcessorKeyBuilder * b)285 void GLCircularRRectEffect::GenKey(const GrProcessor& processor, const GrShaderCaps&,
286 GrProcessorKeyBuilder* b) {
287 const CircularRRectEffect& crre = processor.cast<CircularRRectEffect>();
288 GR_STATIC_ASSERT(kGrClipEdgeTypeCnt <= 8);
289 b->add32((crre.getCircularCornerFlags() << 3) | (int) crre.getEdgeType());
290 }
291
onSetData(const GrGLSLProgramDataManager & pdman,const GrFragmentProcessor & processor)292 void GLCircularRRectEffect::onSetData(const GrGLSLProgramDataManager& pdman,
293 const GrFragmentProcessor& processor) {
294 const CircularRRectEffect& crre = processor.cast<CircularRRectEffect>();
295 const SkRRect& rrect = crre.getRRect();
296 if (rrect != fPrevRRect) {
297 SkRect rect = rrect.getBounds();
298 SkScalar radius = 0;
299 switch (crre.getCircularCornerFlags()) {
300 case CircularRRectEffect::kAll_CornerFlags:
301 SkASSERT(SkRRectPriv::IsSimpleCircular(rrect));
302 radius = SkRRectPriv::GetSimpleRadii(rrect).fX;
303 SkASSERT(radius >= kRadiusMin);
304 rect.inset(radius, radius);
305 break;
306 case CircularRRectEffect::kTopLeft_CornerFlag:
307 radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX;
308 rect.fLeft += radius;
309 rect.fTop += radius;
310 rect.fRight += 0.5f;
311 rect.fBottom += 0.5f;
312 break;
313 case CircularRRectEffect::kTopRight_CornerFlag:
314 radius = rrect.radii(SkRRect::kUpperRight_Corner).fX;
315 rect.fLeft -= 0.5f;
316 rect.fTop += radius;
317 rect.fRight -= radius;
318 rect.fBottom += 0.5f;
319 break;
320 case CircularRRectEffect::kBottomRight_CornerFlag:
321 radius = rrect.radii(SkRRect::kLowerRight_Corner).fX;
322 rect.fLeft -= 0.5f;
323 rect.fTop -= 0.5f;
324 rect.fRight -= radius;
325 rect.fBottom -= radius;
326 break;
327 case CircularRRectEffect::kBottomLeft_CornerFlag:
328 radius = rrect.radii(SkRRect::kLowerLeft_Corner).fX;
329 rect.fLeft += radius;
330 rect.fTop -= 0.5f;
331 rect.fRight += 0.5f;
332 rect.fBottom -= radius;
333 break;
334 case CircularRRectEffect::kLeft_CornerFlags:
335 radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX;
336 rect.fLeft += radius;
337 rect.fTop += radius;
338 rect.fRight += 0.5f;
339 rect.fBottom -= radius;
340 break;
341 case CircularRRectEffect::kTop_CornerFlags:
342 radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX;
343 rect.fLeft += radius;
344 rect.fTop += radius;
345 rect.fRight -= radius;
346 rect.fBottom += 0.5f;
347 break;
348 case CircularRRectEffect::kRight_CornerFlags:
349 radius = rrect.radii(SkRRect::kUpperRight_Corner).fX;
350 rect.fLeft -= 0.5f;
351 rect.fTop += radius;
352 rect.fRight -= radius;
353 rect.fBottom -= radius;
354 break;
355 case CircularRRectEffect::kBottom_CornerFlags:
356 radius = rrect.radii(SkRRect::kLowerLeft_Corner).fX;
357 rect.fLeft += radius;
358 rect.fTop -= 0.5f;
359 rect.fRight -= radius;
360 rect.fBottom -= radius;
361 break;
362 default:
363 SK_ABORT("Should have been one of the above cases.");
364 }
365 pdman.set4f(fInnerRectUniform, rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
366 radius += 0.5f;
367 pdman.set2f(fRadiusPlusHalfUniform, radius, 1.f / radius);
368 fPrevRRect = rrect;
369 }
370 }
371
372 ////////////////////////////////////////////////////////////////////////////////////////////////////
373
onGetGLSLProcessorKey(const GrShaderCaps & caps,GrProcessorKeyBuilder * b) const374 void CircularRRectEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps,
375 GrProcessorKeyBuilder* b) const {
376 GLCircularRRectEffect::GenKey(*this, caps, b);
377 }
378
onCreateGLSLInstance() const379 GrGLSLFragmentProcessor* CircularRRectEffect::onCreateGLSLInstance() const {
380 return new GLCircularRRectEffect;
381 }
382
383 //////////////////////////////////////////////////////////////////////////////
384
385 class EllipticalRRectEffect : public GrFragmentProcessor {
386 public:
387 static std::unique_ptr<GrFragmentProcessor> Make(GrClipEdgeType, const SkRRect&);
388
~EllipticalRRectEffect()389 ~EllipticalRRectEffect() override {}
390
name() const391 const char* name() const override { return "EllipticalRRect"; }
392
393 std::unique_ptr<GrFragmentProcessor> clone() const override;
394
getRRect() const395 const SkRRect& getRRect() const { return fRRect; }
396
getEdgeType() const397 GrClipEdgeType getEdgeType() const { return fEdgeType; }
398
399 private:
400 EllipticalRRectEffect(GrClipEdgeType, const SkRRect&);
401
402 GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
403
404 void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override;
405
406 bool onIsEqual(const GrFragmentProcessor& other) const override;
407
408 SkRRect fRRect;
409 GrClipEdgeType fEdgeType;
410
411 GR_DECLARE_FRAGMENT_PROCESSOR_TEST
412
413 typedef GrFragmentProcessor INHERITED;
414 };
415
Make(GrClipEdgeType edgeType,const SkRRect & rrect)416 std::unique_ptr<GrFragmentProcessor> EllipticalRRectEffect::Make(GrClipEdgeType edgeType,
417 const SkRRect& rrect) {
418 if (GrClipEdgeType::kFillAA != edgeType && GrClipEdgeType::kInverseFillAA != edgeType) {
419 return nullptr;
420 }
421 return std::unique_ptr<GrFragmentProcessor>(new EllipticalRRectEffect(edgeType, rrect));
422 }
423
EllipticalRRectEffect(GrClipEdgeType edgeType,const SkRRect & rrect)424 EllipticalRRectEffect::EllipticalRRectEffect(GrClipEdgeType edgeType, const SkRRect& rrect)
425 : INHERITED(kEllipticalRRectEffect_ClassID, kCompatibleWithCoverageAsAlpha_OptimizationFlag)
426 , fRRect(rrect)
427 , fEdgeType(edgeType) {
428 }
429
clone() const430 std::unique_ptr<GrFragmentProcessor> EllipticalRRectEffect::clone() const {
431 return std::unique_ptr<GrFragmentProcessor>(new EllipticalRRectEffect(fEdgeType, fRRect));
432 }
433
onIsEqual(const GrFragmentProcessor & other) const434 bool EllipticalRRectEffect::onIsEqual(const GrFragmentProcessor& other) const {
435 const EllipticalRRectEffect& erre = other.cast<EllipticalRRectEffect>();
436 return fEdgeType == erre.fEdgeType && fRRect == erre.fRRect;
437 }
438
439 //////////////////////////////////////////////////////////////////////////////
440
441 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(EllipticalRRectEffect);
442
443 #if GR_TEST_UTILS
TestCreate(GrProcessorTestData * d)444 std::unique_ptr<GrFragmentProcessor> EllipticalRRectEffect::TestCreate(GrProcessorTestData* d) {
445 SkScalar w = d->fRandom->nextRangeScalar(20.f, 1000.f);
446 SkScalar h = d->fRandom->nextRangeScalar(20.f, 1000.f);
447 SkVector r[4];
448 r[SkRRect::kUpperLeft_Corner].fX = d->fRandom->nextRangeF(kRadiusMin, 9.f);
449 // ensure at least one corner really is elliptical
450 do {
451 r[SkRRect::kUpperLeft_Corner].fY = d->fRandom->nextRangeF(kRadiusMin, 9.f);
452 } while (r[SkRRect::kUpperLeft_Corner].fY == r[SkRRect::kUpperLeft_Corner].fX);
453
454 SkRRect rrect;
455 if (d->fRandom->nextBool()) {
456 // half the time create a four-radii rrect.
457 r[SkRRect::kLowerRight_Corner].fX = d->fRandom->nextRangeF(kRadiusMin, 9.f);
458 r[SkRRect::kLowerRight_Corner].fY = d->fRandom->nextRangeF(kRadiusMin, 9.f);
459
460 r[SkRRect::kUpperRight_Corner].fX = r[SkRRect::kLowerRight_Corner].fX;
461 r[SkRRect::kUpperRight_Corner].fY = r[SkRRect::kUpperLeft_Corner].fY;
462
463 r[SkRRect::kLowerLeft_Corner].fX = r[SkRRect::kUpperLeft_Corner].fX;
464 r[SkRRect::kLowerLeft_Corner].fY = r[SkRRect::kLowerRight_Corner].fY;
465
466 rrect.setRectRadii(SkRect::MakeWH(w, h), r);
467 } else {
468 rrect.setRectXY(SkRect::MakeWH(w, h), r[SkRRect::kUpperLeft_Corner].fX,
469 r[SkRRect::kUpperLeft_Corner].fY);
470 }
471 std::unique_ptr<GrFragmentProcessor> fp;
472 do {
473 GrClipEdgeType et = (GrClipEdgeType)d->fRandom->nextULessThan(kGrClipEdgeTypeCnt);
474 fp = GrRRectEffect::Make(et, rrect, *d->caps()->shaderCaps());
475 } while (nullptr == fp);
476 return fp;
477 }
478 #endif
479
480 //////////////////////////////////////////////////////////////////////////////
481
482 class GLEllipticalRRectEffect : public GrGLSLFragmentProcessor {
483 public:
484 GLEllipticalRRectEffect() = default;
485
486 void emitCode(EmitArgs&) override;
487
488 static inline void GenKey(const GrProcessor&, const GrShaderCaps&, GrProcessorKeyBuilder*);
489
490 protected:
491 void onSetData(const GrGLSLProgramDataManager&, const GrFragmentProcessor&) override;
492
493 private:
494 GrGLSLProgramDataManager::UniformHandle fInnerRectUniform;
495 GrGLSLProgramDataManager::UniformHandle fInvRadiiSqdUniform;
496 GrGLSLProgramDataManager::UniformHandle fScaleUniform;
497 SkRRect fPrevRRect;
498 typedef GrGLSLFragmentProcessor INHERITED;
499 };
500
emitCode(EmitArgs & args)501 void GLEllipticalRRectEffect::emitCode(EmitArgs& args) {
502 const EllipticalRRectEffect& erre = args.fFp.cast<EllipticalRRectEffect>();
503 GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
504 const char *rectName;
505 // The inner rect is the rrect bounds inset by the x/y radii
506 fInnerRectUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, kFloat4_GrSLType,
507 "innerRect", &rectName);
508
509 GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
510 // At each quarter-ellipse corner we compute a vector that is the offset of the fragment pos
511 // to the ellipse center. The vector is pinned in x and y to be in the quarter-plane relevant
512 // to that corner. This means that points near the interior near the rrect top edge will have
513 // a vector that points straight up for both the TL left and TR corners. Computing an
514 // alpha from this vector at either the TR or TL corner will give the correct result. Similarly,
515 // fragments near the other three edges will get the correct AA. Fragments in the interior of
516 // the rrect will have a (0,0) vector at all four corners. So long as the radii > 0.5 they will
517 // correctly produce an alpha value of 1 at all four corners. We take the min of all the alphas.
518 //
519 // The code below is a simplified version of the above that performs maxs on the vector
520 // components before computing distances and alpha values so that only one distance computation
521 // need be computed to determine the min alpha.
522 fragBuilder->codeAppendf("float2 dxy0 = %s.xy - sk_FragCoord.xy;", rectName);
523 fragBuilder->codeAppendf("float2 dxy1 = sk_FragCoord.xy - %s.zw;", rectName);
524
525 // If we're on a device where float != fp32 then we'll do the distance computation in a space
526 // that is normalized by the largest radius. The scale uniform will be scale, 1/scale. The
527 // radii uniform values are already in this normalized space.
528 const char* scaleName = nullptr;
529 if (!args.fShaderCaps->floatIs32Bits()) {
530 fScaleUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf2_GrSLType, "scale",
531 &scaleName);
532 }
533
534 // The uniforms with the inv squared radii are highp to prevent underflow.
535 switch (erre.getRRect().getType()) {
536 case SkRRect::kSimple_Type: {
537 const char *invRadiiXYSqdName;
538 fInvRadiiSqdUniform = uniformHandler->addUniform(kFragment_GrShaderFlag,
539 kFloat2_GrSLType,
540 "invRadiiXY",
541 &invRadiiXYSqdName);
542 fragBuilder->codeAppend("float2 dxy = max(max(dxy0, dxy1), 0.0);");
543 if (scaleName) {
544 fragBuilder->codeAppendf("dxy *= %s.y;", scaleName);
545 }
546 // Z is the x/y offsets divided by squared radii.
547 fragBuilder->codeAppendf("float2 Z = dxy * %s.xy;", invRadiiXYSqdName);
548 break;
549 }
550 case SkRRect::kNinePatch_Type: {
551 const char *invRadiiLTRBSqdName;
552 fInvRadiiSqdUniform = uniformHandler->addUniform(kFragment_GrShaderFlag,
553 kFloat4_GrSLType,
554 "invRadiiLTRB",
555 &invRadiiLTRBSqdName);
556 if (scaleName) {
557 fragBuilder->codeAppendf("dxy0 *= %s.y;", scaleName);
558 fragBuilder->codeAppendf("dxy1 *= %s.y;", scaleName);
559 }
560 fragBuilder->codeAppend("float2 dxy = max(max(dxy0, dxy1), 0.0);");
561 // Z is the x/y offsets divided by squared radii. We only care about the (at most) one
562 // corner where both the x and y offsets are positive, hence the maxes. (The inverse
563 // squared radii will always be positive.)
564 fragBuilder->codeAppendf("float2 Z = max(max(dxy0 * %s.xy, dxy1 * %s.zw), 0.0);",
565 invRadiiLTRBSqdName, invRadiiLTRBSqdName);
566
567 break;
568 }
569 default:
570 SK_ABORT("RRect should always be simple or nine-patch.");
571 }
572 // implicit is the evaluation of (x/a)^2 + (y/b)^2 - 1.
573 fragBuilder->codeAppend("half implicit = half(dot(Z, dxy) - 1.0);");
574 // grad_dot is the squared length of the gradient of the implicit.
575 fragBuilder->codeAppend("half grad_dot = half(4.0 * dot(Z, Z));");
576 // avoid calling inversesqrt on zero.
577 fragBuilder->codeAppend("grad_dot = max(grad_dot, 1.0e-4);");
578 fragBuilder->codeAppend("half approx_dist = implicit * half(inversesqrt(grad_dot));");
579 if (scaleName) {
580 fragBuilder->codeAppendf("approx_dist *= %s.x;", scaleName);
581 }
582
583 if (GrClipEdgeType::kFillAA == erre.getEdgeType()) {
584 fragBuilder->codeAppend("half alpha = clamp(0.5 - approx_dist, 0.0, 1.0);");
585 } else {
586 fragBuilder->codeAppend("half alpha = clamp(0.5 + approx_dist, 0.0, 1.0);");
587 }
588
589 fragBuilder->codeAppendf("%s = %s * alpha;", args.fOutputColor, args.fInputColor);
590 }
591
GenKey(const GrProcessor & effect,const GrShaderCaps &,GrProcessorKeyBuilder * b)592 void GLEllipticalRRectEffect::GenKey(const GrProcessor& effect, const GrShaderCaps&,
593 GrProcessorKeyBuilder* b) {
594 const EllipticalRRectEffect& erre = effect.cast<EllipticalRRectEffect>();
595 GR_STATIC_ASSERT((int) GrClipEdgeType::kLast < (1 << 3));
596 b->add32(erre.getRRect().getType() | (int) erre.getEdgeType() << 3);
597 }
598
onSetData(const GrGLSLProgramDataManager & pdman,const GrFragmentProcessor & effect)599 void GLEllipticalRRectEffect::onSetData(const GrGLSLProgramDataManager& pdman,
600 const GrFragmentProcessor& effect) {
601 const EllipticalRRectEffect& erre = effect.cast<EllipticalRRectEffect>();
602 const SkRRect& rrect = erre.getRRect();
603 // If we're using a scale factor to work around precision issues, choose the largest radius
604 // as the scale factor. The inv radii need to be pre-adjusted by the scale factor.
605 if (rrect != fPrevRRect) {
606 SkRect rect = rrect.getBounds();
607 const SkVector& r0 = rrect.radii(SkRRect::kUpperLeft_Corner);
608 SkASSERT(r0.fX >= kRadiusMin);
609 SkASSERT(r0.fY >= kRadiusMin);
610 switch (erre.getRRect().getType()) {
611 case SkRRect::kSimple_Type:
612 rect.inset(r0.fX, r0.fY);
613 if (fScaleUniform.isValid()) {
614 if (r0.fX > r0.fY) {
615 pdman.set2f(fInvRadiiSqdUniform, 1.f, (r0.fX * r0.fX) / (r0.fY * r0.fY));
616 pdman.set2f(fScaleUniform, r0.fX, 1.f / r0.fX);
617 } else {
618 pdman.set2f(fInvRadiiSqdUniform, (r0.fY * r0.fY) / (r0.fX * r0.fX), 1.f);
619 pdman.set2f(fScaleUniform, r0.fY, 1.f / r0.fY);
620 }
621 } else {
622 pdman.set2f(fInvRadiiSqdUniform, 1.f / (r0.fX * r0.fX),
623 1.f / (r0.fY * r0.fY));
624 }
625 break;
626 case SkRRect::kNinePatch_Type: {
627 const SkVector& r1 = rrect.radii(SkRRect::kLowerRight_Corner);
628 SkASSERT(r1.fX >= kRadiusMin);
629 SkASSERT(r1.fY >= kRadiusMin);
630 rect.fLeft += r0.fX;
631 rect.fTop += r0.fY;
632 rect.fRight -= r1.fX;
633 rect.fBottom -= r1.fY;
634 if (fScaleUniform.isValid()) {
635 float scale = SkTMax(SkTMax(r0.fX, r0.fY), SkTMax(r1.fX, r1.fY));
636 float scaleSqd = scale * scale;
637 pdman.set4f(fInvRadiiSqdUniform, scaleSqd / (r0.fX * r0.fX),
638 scaleSqd / (r0.fY * r0.fY),
639 scaleSqd / (r1.fX * r1.fX),
640 scaleSqd / (r1.fY * r1.fY));
641 pdman.set2f(fScaleUniform, scale, 1.f / scale);
642 } else {
643 pdman.set4f(fInvRadiiSqdUniform, 1.f / (r0.fX * r0.fX),
644 1.f / (r0.fY * r0.fY),
645 1.f / (r1.fX * r1.fX),
646 1.f / (r1.fY * r1.fY));
647 }
648 break;
649 }
650 default:
651 SK_ABORT("RRect should always be simple or nine-patch.");
652 }
653 pdman.set4f(fInnerRectUniform, rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
654 fPrevRRect = rrect;
655 }
656 }
657
658 ////////////////////////////////////////////////////////////////////////////////////////////////////
659
onGetGLSLProcessorKey(const GrShaderCaps & caps,GrProcessorKeyBuilder * b) const660 void EllipticalRRectEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps,
661 GrProcessorKeyBuilder* b) const {
662 GLEllipticalRRectEffect::GenKey(*this, caps, b);
663 }
664
onCreateGLSLInstance() const665 GrGLSLFragmentProcessor* EllipticalRRectEffect::onCreateGLSLInstance() const {
666 return new GLEllipticalRRectEffect;
667 }
668
669 //////////////////////////////////////////////////////////////////////////////
670
Make(GrClipEdgeType edgeType,const SkRRect & rrect,const GrShaderCaps & caps)671 std::unique_ptr<GrFragmentProcessor> GrRRectEffect::Make(GrClipEdgeType edgeType,
672 const SkRRect& rrect,
673 const GrShaderCaps& caps) {
674 if (rrect.isRect()) {
675 return GrConvexPolyEffect::Make(edgeType, rrect.getBounds());
676 }
677
678 if (rrect.isOval()) {
679 return GrOvalEffect::Make(edgeType, rrect.getBounds(), caps);
680 }
681
682 if (rrect.isSimple()) {
683 if (SkRRectPriv::GetSimpleRadii(rrect).fX < kRadiusMin ||
684 SkRRectPriv::GetSimpleRadii(rrect).fY < kRadiusMin) {
685 // In this case the corners are extremely close to rectangular and we collapse the
686 // clip to a rectangular clip.
687 return GrConvexPolyEffect::Make(edgeType, rrect.getBounds());
688 }
689 if (SkRRectPriv::GetSimpleRadii(rrect).fX == SkRRectPriv::GetSimpleRadii(rrect).fY) {
690 return CircularRRectEffect::Make(edgeType, CircularRRectEffect::kAll_CornerFlags,
691 rrect);
692 } else {
693 return EllipticalRRectEffect::Make(edgeType, rrect);
694 }
695 }
696
697 if (rrect.isComplex() || rrect.isNinePatch()) {
698 // Check for the "tab" cases - two adjacent circular corners and two square corners.
699 SkScalar circularRadius = 0;
700 uint32_t cornerFlags = 0;
701
702 SkVector radii[4];
703 bool squashedRadii = false;
704 for (int c = 0; c < 4; ++c) {
705 radii[c] = rrect.radii((SkRRect::Corner)c);
706 SkASSERT((0 == radii[c].fX) == (0 == radii[c].fY));
707 if (0 == radii[c].fX) {
708 // The corner is square, so no need to squash or flag as circular.
709 continue;
710 }
711 if (radii[c].fX < kRadiusMin || radii[c].fY < kRadiusMin) {
712 radii[c].set(0, 0);
713 squashedRadii = true;
714 continue;
715 }
716 if (radii[c].fX != radii[c].fY) {
717 cornerFlags = ~0U;
718 break;
719 }
720 if (!cornerFlags) {
721 circularRadius = radii[c].fX;
722 cornerFlags = 1 << c;
723 } else {
724 if (radii[c].fX != circularRadius) {
725 cornerFlags = ~0U;
726 break;
727 }
728 cornerFlags |= 1 << c;
729 }
730 }
731
732 switch (cornerFlags) {
733 case CircularRRectEffect::kAll_CornerFlags:
734 // This rrect should have been caught in the simple case above. Though, it would
735 // be correctly handled in the fallthrough code.
736 SkASSERT(false);
737 case CircularRRectEffect::kTopLeft_CornerFlag:
738 case CircularRRectEffect::kTopRight_CornerFlag:
739 case CircularRRectEffect::kBottomRight_CornerFlag:
740 case CircularRRectEffect::kBottomLeft_CornerFlag:
741 case CircularRRectEffect::kLeft_CornerFlags:
742 case CircularRRectEffect::kTop_CornerFlags:
743 case CircularRRectEffect::kRight_CornerFlags:
744 case CircularRRectEffect::kBottom_CornerFlags: {
745 SkTCopyOnFirstWrite<SkRRect> rr(rrect);
746 if (squashedRadii) {
747 rr.writable()->setRectRadii(rrect.getBounds(), radii);
748 }
749 return CircularRRectEffect::Make(edgeType, cornerFlags, *rr);
750 }
751 case CircularRRectEffect::kNone_CornerFlags:
752 return GrConvexPolyEffect::Make(edgeType, rrect.getBounds());
753 default: {
754 if (squashedRadii) {
755 // If we got here then we squashed some but not all the radii to zero. (If all
756 // had been squashed cornerFlags would be 0.) The elliptical effect doesn't
757 // support some rounded and some square corners.
758 return nullptr;
759 }
760 if (rrect.isNinePatch()) {
761 return EllipticalRRectEffect::Make(edgeType, rrect);
762 }
763 return nullptr;
764 }
765 }
766 }
767
768 return nullptr;
769 }
770