Get gradient information for gpu effect directly from SkGradientShader instead of calling asAGradie…

src/effects/gradients/SkGradientShader.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGradientShaderPriv.h"
 #include "SkLinearGradient.h"
 #include "SkRadialGradient.h"
@@ skipping 202 matching lines @@
     if (fColorCount > 2) {
         Rec* recs = fRecs;
         for (int i = 1; i < fColorCount; i++) {
             buffer.writeInt(recs[i].fPos);
             buffer.writeUInt(recs[i].fScale);
         }
     }
     buffer.writeMatrix(fPtsToUnit);
 }
 
+SkGradientShaderBase::GpuColorType SkGradientShaderBase::getGpuColorType(SkColor colors[3]) const {
+    if (fColorCount <= 3) {
+        memcpy(colors, fOrigColors, fColorCount * sizeof(SkColor));
+    }
+
+    if (SkShader::kClamp_TileMode == fTileMode) {
+        if (2 == fColorCount) {
+            return kTwo_GpuColorType;
+        } else if (3 == fColorCount &&
+                   (SkScalarAbs(
+                    SkFixedToScalar(fRecs[1].fPos) - SK_ScalarHalf) < SK_Scalar1 / 1000)) {
+            return kThree_GpuColorType;
+        }
+    }
+    return kTexture_GpuColorType;
+}
+
 bool SkGradientShaderBase::isOpaque() const {
     return fColorsAreOpaque;
 }
 
 bool SkGradientShaderBase::setContext(const SkBitmap& device,
                                  const SkPaint& paint,
                                  const SkMatrix& matrix) {
     if (!this->INHERITED::setContext(device, paint, matrix)) {
         return false;
     }
@@ skipping 592 matching lines @@
 
 GrGLGradientEffect::GrGLGradientEffect(const GrBackendEffectFactory& factory)
     : INHERITED(factory)
     , fCachedYCoord(SK_ScalarMax) {
 }
 
 GrGLGradientEffect::~GrGLGradientEffect() { }
 
 void GrGLGradientEffect::emitUniforms(GrGLShaderBuilder* builder, EffectKey key) {
 
-    if (GrGradientEffect::kTwo_ColorType == ColorTypeFromKey(key)) { // 2 Color case
+    if (SkGradientShaderBase::kTwo_GpuColorType == ColorTypeFromKey(key)) { // 2 Color case
         fColorStartUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
                                              kVec4f_GrSLType, "GradientStartColor");
         fColorEndUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
                                            kVec4f_GrSLType, "GradientEndColor");
 
-    } else if (GrGradientEffect::kThree_ColorType == ColorTypeFromKey(key)){ // 3 Color Case
+    } else if (SkGradientShaderBase::kThree_GpuColorType == ColorTypeFromKey(key)){ // 3 Color Case
         fColorStartUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
                                              kVec4f_GrSLType, "GradientStartColor");
         fColorMidUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
                                            kVec4f_GrSLType, "GradientMidColor");
         fColorEndUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
                                              kVec4f_GrSLType, "GradientEndColor");
 
     } else { // if not a fast case
         fFSYUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
                                       kFloat_GrSLType, "GradientYCoordFS");
@@ skipping 21 matching lines @@
                   SkColorGetB(*color) * aDiv255,
                   a);
 }
 
 void GrGLGradientEffect::setData(const GrGLUniformManager& uman,
                                  const GrDrawEffect& drawEffect) {
 
     const GrGradientEffect& e = drawEffect.castEffect<GrGradientEffect>();
 
 
-    if (GrGradientEffect::kTwo_ColorType == e.getColorType()){
+    if (SkGradientShaderBase::kTwo_GpuColorType == e.getColorType()){
 
         if (GrGradientEffect::kBeforeInterp_PremulType == e.getPremulType()) {
             set_mul_color_uni(uman, fColorStartUni, e.getColors(0));
             set_mul_color_uni(uman, fColorEndUni,   e.getColors(1));
         } else {
             set_color_uni(uman, fColorStartUni, e.getColors(0));
             set_color_uni(uman, fColorEndUni,   e.getColors(1));
         }
 
-    } else if (GrGradientEffect::kThree_ColorType == e.getColorType()){
+    } else if (SkGradientShaderBase::kThree_GpuColorType == e.getColorType()){
 
         if (GrGradientEffect::kBeforeInterp_PremulType == e.getPremulType()) {
             set_mul_color_uni(uman, fColorStartUni, e.getColors(0));
             set_mul_color_uni(uman, fColorMidUni,   e.getColors(1));
             set_mul_color_uni(uman, fColorEndUni,   e.getColors(2));
         } else {
             set_color_uni(uman, fColorStartUni, e.getColors(0));
             set_color_uni(uman, fColorMidUni,   e.getColors(1));
             set_color_uni(uman, fColorEndUni,   e.getColors(2));
         }
     } else {
 
         SkScalar yCoord = e.getYCoord();
         if (yCoord != fCachedYCoord) {
             uman.set1f(fFSYUni, yCoord);
             fCachedYCoord = yCoord;
         }
     }
 }
 
 
 GrGLEffect::EffectKey GrGLGradientEffect::GenBaseGradientKey(const GrDrawEffect& drawEffect) {
     const GrGradientEffect& e = drawEffect.castEffect<GrGradientEffect>();
 
     EffectKey key = 0;
 
-    if (GrGradientEffect::kTwo_ColorType == e.getColorType()) {
+    if (SkGradientShaderBase::kTwo_GpuColorType == e.getColorType()) {
         key |= kTwoColorKey;
-    } else if (GrGradientEffect::kThree_ColorType == e.getColorType()){
+    } else if (SkGradientShaderBase::kThree_GpuColorType == e.getColorType()){
         key |= kThreeColorKey;
     }
 
     if (GrGradientEffect::kBeforeInterp_PremulType == e.getPremulType()) {
         key |= kPremulBeforeInterpKey;
     }
 
     return key;
 }
 
 void GrGLGradientEffect::emitColor(GrGLShaderBuilder* builder,
                                    const char* gradientTValue,
                                    EffectKey key,
                                    const char* outputColor,
                                    const char* inputColor,
                                    const TextureSamplerArray& samplers) {
-    if (GrGradientEffect::kTwo_ColorType == ColorTypeFromKey(key)){
+    if (SkGradientShaderBase::kTwo_GpuColorType == ColorTypeFromKey(key)){
         builder->fsCodeAppendf("\tvec4 colorTemp = mix(%s, %s, clamp(%s, 0.0, 1.0));\n",
                                builder->getUniformVariable(fColorStartUni).c_str(),
                                builder->getUniformVariable(fColorEndUni).c_str(),
                                gradientTValue);
         // Note that we could skip this step if both colors are known to be opaque. Two
         // considerations:
         // The gradient SkShader reporting opaque is more restrictive than necessary in the two pt
         // case. Make sure the key reflects this optimization (and note that it can use the same
         // shader as thekBeforeIterp case). This same optimization applies to the 3 color case below.
         if (GrGradientEffect::kAfterInterp_PremulType == PremulTypeFromKey(key)) {
             builder->fsCodeAppend("\tcolorTemp.rgb *= colorTemp.a;\n");
         }
 
         builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
                                (GrGLSLExpr4(inputColor) * GrGLSLExpr4("colorTemp")).c_str());
-    } else if (GrGradientEffect::kThree_ColorType == ColorTypeFromKey(key)){
+    } else if (SkGradientShaderBase::kThree_GpuColorType == ColorTypeFromKey(key)){
         builder->fsCodeAppendf("\tfloat oneMinus2t = 1.0 - (2.0 * (%s));\n",
                                gradientTValue);
         builder->fsCodeAppendf("\tvec4 colorTemp = clamp(oneMinus2t, 0.0, 1.0) * %s;\n",
                                builder->getUniformVariable(fColorStartUni).c_str());
         if (kTegra3_GrGLRenderer == builder->ctxInfo().renderer()) {
             // The Tegra3 compiler will sometimes never return if we have
             // min(abs(oneMinus2t), 1.0), or do the abs first in a separate expression.
             builder->fsCodeAppend("\tfloat minAbs = abs(oneMinus2t);\n");
             builder->fsCodeAppend("\tminAbs = minAbs > 1.0 ? 1.0 : minAbs;\n");
             builder->fsCodeAppendf("\tcolorTemp += (1.0 - minAbs) * %s;\n",
@@ skipping 24 matching lines @@
 
 /////////////////////////////////////////////////////////////////////
 
 GrGradientEffect::GrGradientEffect(GrContext* ctx,
                                    const SkGradientShaderBase& shader,
                                    const SkMatrix& matrix,
                                    SkShader::TileMode tileMode) {
 
     fIsOpaque = shader.isOpaque();
 
-    SkShader::GradientInfo info;
-    SkScalar pos[3] = {0};
-
-    info.fColorCount = 3;
-    info.fColors = &fColors[0];
-    info.fColorOffsets = &pos[0];
-    shader.asAGradient(&info);
+    fColorType = shader.getGpuColorType(&fColors[0]);
 
     // The two and three color specializations do not currently support tiling.
-    bool foundSpecialCase = false;
-    if (SkShader::kClamp_TileMode == info.fTileMode) {
-        if (2 == info.fColorCount) {
-            fRow = -1; // flag for no atlas
-            fColorType = kTwo_ColorType;
-            foundSpecialCase = true;
-        } else if (3 == info.fColorCount &&
-                   (SkScalarAbs(pos[1] - SK_ScalarHalf) < SK_Scalar1 / 1000)) { // 3 color symmetric
-            fRow = -1; // flag for no atlas
-            fColorType = kThree_ColorType;
-            foundSpecialCase = true;
-        }
-    }
-    if (foundSpecialCase) {
-        if (SkGradientShader::kInterpolateColorsInPremul_Flag & info.fGradientFlags) {
+    if (SkGradientShaderBase::kTwo_GpuColorType == fColorType ||
+        SkGradientShaderBase::kThree_GpuColorType == fColorType) {
+        fRow = -1;
+        
+        if (SkGradientShader::kInterpolateColorsInPremul_Flag & shader.getFlags()) {
             fPremulType = kBeforeInterp_PremulType;
         } else {
             fPremulType = kAfterInterp_PremulType;
         }
         fCoordTransform.reset(kCoordSet, matrix);
     } else {
         // doesn't matter how this is set, just be consistent because it is part of the effect key.
         fPremulType = kBeforeInterp_PremulType;
         SkBitmap bitmap;
         shader.getGradientTableBitmap(&bitmap);
-        fColorType = kTexture_ColorType;
 
         GrTextureStripAtlas::Desc desc;
         desc.fWidth  = bitmap.width();
         desc.fHeight = 32;
         desc.fRowHeight = bitmap.height();
         desc.fContext = ctx;
         desc.fConfig = SkImageInfo2GrPixelConfig(bitmap.colorType(), bitmap.alphaType());
         fAtlas = GrTextureStripAtlas::GetAtlas(desc);
         SkASSERT(NULL != fAtlas);
 
@@ skipping 28 matching lines @@
     if (this->useAtlas()) {
         fAtlas->unlockRow(fRow);
     }
 }
 
 bool GrGradientEffect::onIsEqual(const GrEffect& effect) const {
     const GrGradientEffect& s = CastEffect<GrGradientEffect>(effect);
 
     if (this->fColorType == s.getColorType()){
 
-        if (kTwo_ColorType == fColorType) {
+        if (SkGradientShaderBase::kTwo_GpuColorType == fColorType) {
             if (*this->getColors(0) != *s.getColors(0) ||
                 *this->getColors(1) != *s.getColors(1)) {
                 return false;
             }
-        } else if (kThree_ColorType == fColorType) {
+        } else if (SkGradientShaderBase::kThree_GpuColorType == fColorType) {
             if (*this->getColors(0) != *s.getColors(0) ||
                 *this->getColors(1) != *s.getColors(1) ||
                 *this->getColors(2) != *s.getColors(2)) {
                 return false;
             }
         } else {
             if (fYCoord != s.getYCoord()) {
                 return false;
             }
         }
@@ skipping 34 matching lines @@
             (*stops)[i] = stop;
             stop = i < outColors - 1 ? stop + random->nextUScalar1() * (1.f - stop) : 1.f;
         }
     }
     *tm = static_cast<SkShader::TileMode>(random->nextULessThan(SkShader::kTileModeCount));
 
     return outColors;
 }
 
 #endif