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1 /* | 1 /* |
2 * Copyright 2014 Google Inc. | 2 * Copyright 2014 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include "GrRRectEffect.h" | 8 #include "GrRRectEffect.h" |
9 | 9 |
10 #include "GrConvexPolyEffect.h" | 10 #include "GrConvexPolyEffect.h" |
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161 const TransformedCoordsArray&, | 161 const TransformedCoordsArray&, |
162 const TextureSamplerArray& samplers) { | 162 const TextureSamplerArray& samplers) { |
163 const CircularRRectEffect& crre = fp.cast<CircularRRectEffect>(); | 163 const CircularRRectEffect& crre = fp.cast<CircularRRectEffect>(); |
164 const char *rectName; | 164 const char *rectName; |
165 const char *radiusPlusHalfName; | 165 const char *radiusPlusHalfName; |
166 // The inner rect is the rrect bounds inset by the radius. Its left, top, ri
ght, and bottom | 166 // The inner rect is the rrect bounds inset by the radius. Its left, top, ri
ght, and bottom |
167 // edges correspond to components x, y, z, and w, respectively. When a side
of the rrect has | 167 // edges correspond to components x, y, z, and w, respectively. When a side
of the rrect has |
168 // only rectangular corners, that side's value corresponds to the rect edge'
s value outset by | 168 // only rectangular corners, that side's value corresponds to the rect edge'
s value outset by |
169 // half a pixel. | 169 // half a pixel. |
170 fInnerRectUniform = builder->addUniform(GrGLProgramBuilder::kFragment_Visibi
lity, | 170 fInnerRectUniform = builder->addUniform(GrGLProgramBuilder::kFragment_Visibi
lity, |
171 kVec4f_GrSLType, | 171 kVec4f_GrSLType, kDefault_GrSLPrecis
ion, |
172 "innerRect", | 172 "innerRect", |
173 &rectName); | 173 &rectName); |
174 fRadiusPlusHalfUniform = builder->addUniform(GrGLProgramBuilder::kFragment_V
isibility, | 174 fRadiusPlusHalfUniform = builder->addUniform(GrGLProgramBuilder::kFragment_V
isibility, |
175 kFloat_GrSLType, | 175 kFloat_GrSLType, kDefault_GrSLP
recision, |
176 "radiusPlusHalf", | 176 "radiusPlusHalf", |
177 &radiusPlusHalfName); | 177 &radiusPlusHalfName); |
178 | 178 |
179 GrGLFPFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder(); | 179 GrGLFPFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder(); |
180 const char* fragmentPos = fsBuilder->fragmentPosition(); | 180 const char* fragmentPos = fsBuilder->fragmentPosition(); |
181 // At each quarter-circle corner we compute a vector that is the offset of t
he fragment position | 181 // At each quarter-circle corner we compute a vector that is the offset of t
he fragment position |
182 // from the circle center. The vector is pinned in x and y to be in the quar
ter-plane relevant | 182 // from the circle center. The vector is pinned in x and y to be in the quar
ter-plane relevant |
183 // to that corner. This means that points near the interior near the rrect t
op edge will have | 183 // to that corner. This means that points near the interior near the rrect t
op edge will have |
184 // a vector that points straight up for both the TL left and TR corners. Com
puting an | 184 // a vector that points straight up for both the TL left and TR corners. Com
puting an |
185 // alpha from this vector at either the TR or TL corner will give the correc
t result. Similarly, | 185 // alpha from this vector at either the TR or TL corner will give the correc
t result. Similarly, |
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514 void GLEllipticalRRectEffect::emitCode(GrGLFPBuilder* builder, | 514 void GLEllipticalRRectEffect::emitCode(GrGLFPBuilder* builder, |
515 const GrFragmentProcessor& effect, | 515 const GrFragmentProcessor& effect, |
516 const char* outputColor, | 516 const char* outputColor, |
517 const char* inputColor, | 517 const char* inputColor, |
518 const TransformedCoordsArray&, | 518 const TransformedCoordsArray&, |
519 const TextureSamplerArray& samplers) { | 519 const TextureSamplerArray& samplers) { |
520 const EllipticalRRectEffect& erre = effect.cast<EllipticalRRectEffect>(); | 520 const EllipticalRRectEffect& erre = effect.cast<EllipticalRRectEffect>(); |
521 const char *rectName; | 521 const char *rectName; |
522 // The inner rect is the rrect bounds inset by the x/y radii | 522 // The inner rect is the rrect bounds inset by the x/y radii |
523 fInnerRectUniform = builder->addUniform(GrGLProgramBuilder::kFragment_Visibi
lity, | 523 fInnerRectUniform = builder->addUniform(GrGLProgramBuilder::kFragment_Visibi
lity, |
524 kVec4f_GrSLType, | 524 kVec4f_GrSLType, kDefault_GrSLPrecis
ion, |
525 "innerRect", | 525 "innerRect", |
526 &rectName); | 526 &rectName); |
527 | 527 |
528 GrGLFPFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder(); | 528 GrGLFPFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder(); |
529 const char* fragmentPos = fsBuilder->fragmentPosition(); | 529 const char* fragmentPos = fsBuilder->fragmentPosition(); |
530 // At each quarter-ellipse corner we compute a vector that is the offset of
the fragment pos | 530 // At each quarter-ellipse corner we compute a vector that is the offset of
the fragment pos |
531 // to the ellipse center. The vector is pinned in x and y to be in the quart
er-plane relevant | 531 // to the ellipse center. The vector is pinned in x and y to be in the quart
er-plane relevant |
532 // to that corner. This means that points near the interior near the rrect t
op edge will have | 532 // to that corner. This means that points near the interior near the rrect t
op edge will have |
533 // a vector that points straight up for both the TL left and TR corners. Com
puting an | 533 // a vector that points straight up for both the TL left and TR corners. Com
puting an |
534 // alpha from this vector at either the TR or TL corner will give the correc
t result. Similarly, | 534 // alpha from this vector at either the TR or TL corner will give the correc
t result. Similarly, |
535 // fragments near the other three edges will get the correct AA. Fragments i
n the interior of | 535 // fragments near the other three edges will get the correct AA. Fragments i
n the interior of |
536 // the rrect will have a (0,0) vector at all four corners. So long as the ra
dii > 0.5 they will | 536 // the rrect will have a (0,0) vector at all four corners. So long as the ra
dii > 0.5 they will |
537 // correctly produce an alpha value of 1 at all four corners. We take the mi
n of all the alphas. | 537 // correctly produce an alpha value of 1 at all four corners. We take the mi
n of all the alphas. |
538 // The code below is a simplified version of the above that performs maxs on
the vector | 538 // The code below is a simplified version of the above that performs maxs on
the vector |
539 // components before computing distances and alpha values so that only one d
istance computation | 539 // components before computing distances and alpha values so that only one d
istance computation |
540 // need be computed to determine the min alpha. | 540 // need be computed to determine the min alpha. |
541 fsBuilder->codeAppendf("\t\tvec2 dxy0 = %s.xy - %s.xy;\n", rectName, fragmen
tPos); | 541 fsBuilder->codeAppendf("\t\tvec2 dxy0 = %s.xy - %s.xy;\n", rectName, fragmen
tPos); |
542 fsBuilder->codeAppendf("\t\tvec2 dxy1 = %s.xy - %s.zw;\n", fragmentPos, rect
Name); | 542 fsBuilder->codeAppendf("\t\tvec2 dxy1 = %s.xy - %s.zw;\n", fragmentPos, rect
Name); |
543 switch (erre.getRRect().getType()) { | 543 switch (erre.getRRect().getType()) { |
544 case SkRRect::kSimple_Type: { | 544 case SkRRect::kSimple_Type: { |
545 const char *invRadiiXYSqdName; | 545 const char *invRadiiXYSqdName; |
546 fInvRadiiSqdUniform = builder->addUniform(GrGLProgramBuilder::kFragm
ent_Visibility, | 546 fInvRadiiSqdUniform = builder->addUniform(GrGLProgramBuilder::kFragm
ent_Visibility, |
547 kVec2f_GrSLType, | 547 kVec2f_GrSLType, kDefault_
GrSLPrecision, |
548 "invRadiiXY", | 548 "invRadiiXY", |
549 &invRadiiXYSqdName); | 549 &invRadiiXYSqdName); |
550 fsBuilder->codeAppend("\t\tvec2 dxy = max(max(dxy0, dxy1), 0.0);\n")
; | 550 fsBuilder->codeAppend("\t\tvec2 dxy = max(max(dxy0, dxy1), 0.0);\n")
; |
551 // Z is the x/y offsets divided by squared radii. | 551 // Z is the x/y offsets divided by squared radii. |
552 fsBuilder->codeAppendf("\t\tvec2 Z = dxy * %s;\n", invRadiiXYSqdName
); | 552 fsBuilder->codeAppendf("\t\tvec2 Z = dxy * %s;\n", invRadiiXYSqdName
); |
553 break; | 553 break; |
554 } | 554 } |
555 case SkRRect::kNinePatch_Type: { | 555 case SkRRect::kNinePatch_Type: { |
556 const char *invRadiiLTRBSqdName; | 556 const char *invRadiiLTRBSqdName; |
557 fInvRadiiSqdUniform = builder->addUniform(GrGLProgramBuilder::kFragm
ent_Visibility, | 557 fInvRadiiSqdUniform = builder->addUniform(GrGLProgramBuilder::kFragm
ent_Visibility, |
558 kVec4f_GrSLType, | 558 kVec4f_GrSLType, kDefault_
GrSLPrecision, |
559 "invRadiiLTRB", | 559 "invRadiiLTRB", |
560 &invRadiiLTRBSqdName); | 560 &invRadiiLTRBSqdName); |
561 fsBuilder->codeAppend("\t\tvec2 dxy = max(max(dxy0, dxy1), 0.0);\n")
; | 561 fsBuilder->codeAppend("\t\tvec2 dxy = max(max(dxy0, dxy1), 0.0);\n")
; |
562 // Z is the x/y offsets divided by squared radii. We only care about
the (at most) one | 562 // Z is the x/y offsets divided by squared radii. We only care about
the (at most) one |
563 // corner where both the x and y offsets are positive, hence the max
es. (The inverse | 563 // corner where both the x and y offsets are positive, hence the max
es. (The inverse |
564 // squared radii will always be positive.) | 564 // squared radii will always be positive.) |
565 fsBuilder->codeAppendf("\t\tvec2 Z = max(max(dxy0 * %s.xy, dxy1 * %s
.zw), 0.0);\n", | 565 fsBuilder->codeAppendf("\t\tvec2 Z = max(max(dxy0 * %s.xy, dxy1 * %s
.zw), 0.0);\n", |
566 invRadiiLTRBSqdName, invRadiiLTRBSqdName); | 566 invRadiiLTRBSqdName, invRadiiLTRBSqdName); |
567 break; | 567 break; |
568 } | 568 } |
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733 if (rrect.isNinePatch()) { | 733 if (rrect.isNinePatch()) { |
734 return EllipticalRRectEffect::Create(edgeType, rrect); | 734 return EllipticalRRectEffect::Create(edgeType, rrect); |
735 } | 735 } |
736 return NULL; | 736 return NULL; |
737 } | 737 } |
738 } | 738 } |
739 } | 739 } |
740 | 740 |
741 return NULL; | 741 return NULL; |
742 } | 742 } |
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