Potentially optimize some GrGLEffects for known input color values

src/gpu/GrOvalRenderer.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrOvalRenderer.h"
 
 #include "GrEffect.h"
@@ skipping 80 matching lines @@
 
     class GLEffect : public GrGLVertexEffect {
     public:
         GLEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&)
         : INHERITED (factory) {}
 
         virtual void emitCode(GrGLFullShaderBuilder* builder,
                               const GrDrawEffect& drawEffect,
                               EffectKey key,
                               const char* outputColor,
-                              const char* inputColor,
+                              const GrGLSLExpr4& inputColor,
                               const TransformedCoordsArray&,
                               const TextureSamplerArray& samplers) SK_OVERRIDE {
             const CircleEdgeEffect& circleEffect = drawEffect.castEffect<CircleEdgeEffect>();
             const char *vsName, *fsName;
             builder->addVarying(kVec4f_GrSLType, "CircleEdge", &vsName, &fsName);
 
             const SkString* attrName =
                 builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[0]);
             builder->vsCodeAppendf("\t%s = %s;\n", vsName, attrName->c_str());
 
             builder->fsCodeAppendf("\tfloat d = length(%s.xy);\n", fsName);
             builder->fsCodeAppendf("\tfloat edgeAlpha = clamp(%s.z - d, 0.0, 1.0);\n", fsName);
             if (circleEffect.isStroked()) {
                 builder->fsCodeAppendf("\tfloat innerAlpha = clamp(d - %s.w, 0.0, 1.0);\n", fsName);
                 builder->fsCodeAppend("\tedgeAlpha *= innerAlpha;\n");
             }
 
             builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
-                                   (GrGLSLExpr4(inputColor) * GrGLSLExpr1("edgeAlpha")).c_str());
+                                   (inputColor * GrGLSLExpr1("edgeAlpha")).c_str());
         }
 
         static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
             const CircleEdgeEffect& circleEffect = drawEffect.castEffect<CircleEdgeEffect>();
 
             return circleEffect.isStroked() ? 0x1 : 0x0;
         }
 
         virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE {}
 
@@ skipping 71 matching lines @@
 
     class GLEffect : public GrGLVertexEffect {
     public:
         GLEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&)
         : INHERITED (factory) {}
 
         virtual void emitCode(GrGLFullShaderBuilder* builder,
                               const GrDrawEffect& drawEffect,
                               EffectKey key,
                               const char* outputColor,
-                              const char* inputColor,
+                              const GrGLSLExpr4& inputColor,
                               const TransformedCoordsArray&,
                               const TextureSamplerArray& samplers) SK_OVERRIDE {
             const EllipseEdgeEffect& ellipseEffect = drawEffect.castEffect<EllipseEdgeEffect>();
 
             const char *vsOffsetName, *fsOffsetName;
             const char *vsRadiiName, *fsRadiiName;
 
             builder->addVarying(kVec2f_GrSLType, "EllipseOffsets", &vsOffsetName, &fsOffsetName);
             const SkString* attr0Name =
                 builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[0]);
@@ skipping 19 matching lines @@
             // for inner curve
             if (ellipseEffect.isStroked()) {
                 builder->fsCodeAppendf("\tscaledOffset = %s*%s.zw;\n", fsOffsetName, fsRadiiName);
                 builder->fsCodeAppend("\ttest = dot(scaledOffset, scaledOffset) - 1.0;\n");
                 builder->fsCodeAppendf("\tgrad = 2.0*scaledOffset*%s.zw;\n", fsRadiiName);
                 builder->fsCodeAppend("\tinvlen = inversesqrt(dot(grad, grad));\n");
                 builder->fsCodeAppend("\tedgeAlpha *= clamp(0.5+test*invlen, 0.0, 1.0);\n");
             }
 
             builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
-                                   (GrGLSLExpr4(inputColor) * GrGLSLExpr1("edgeAlpha")).c_str());
+                                   (inputColor * GrGLSLExpr1("edgeAlpha")).c_str());
         }
 
         static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
             const EllipseEdgeEffect& ellipseEffect = drawEffect.castEffect<EllipseEdgeEffect>();
 
             return ellipseEffect.isStroked() ? 0x1 : 0x0;
         }
 
         virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE {
         }
@@ skipping 79 matching lines @@
 
     class GLEffect : public GrGLVertexEffect {
     public:
         GLEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&)
         : INHERITED (factory) {}
 
         virtual void emitCode(GrGLFullShaderBuilder* builder,
                               const GrDrawEffect& drawEffect,
                               EffectKey key,
                               const char* outputColor,
-                              const char* inputColor,
+                              const GrGLSLExpr4& inputColor,
                               const TransformedCoordsArray&,
                               const TextureSamplerArray& samplers) SK_OVERRIDE {
             const DIEllipseEdgeEffect& ellipseEffect = drawEffect.castEffect<DIEllipseEdgeEffect>();
 
             SkAssertResult(builder->enableFeature(
                                               GrGLShaderBuilder::kStandardDerivatives_GLSLFeature));
 
             const char *vsOffsetName0, *fsOffsetName0;
             builder->addVarying(kVec2f_GrSLType, "EllipseOffsets0",
                                       &vsOffsetName0, &fsOffsetName0);
@@ skipping 37 matching lines @@
                 builder->fsCodeAppendf("\tduvdx = dFdx(%s);\n", fsOffsetName1);
                 builder->fsCodeAppendf("\tduvdy = dFdy(%s);\n", fsOffsetName1);
                 builder->fsCodeAppendf("\tgrad = vec2(2.0*%s.x*duvdx.x + 2.0*%s.y*duvdx.y,\n"
                                        "\t            2.0*%s.x*duvdy.x + 2.0*%s.y*duvdy.y);\n",
                                        fsOffsetName1, fsOffsetName1, fsOffsetName1, fsOffsetName1);
                 builder->fsCodeAppend("\tinvlen = inversesqrt(dot(grad, grad));\n");
                 builder->fsCodeAppend("\tedgeAlpha *= clamp(0.5+test*invlen, 0.0, 1.0);\n");
             }
 
             builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
-                                   (GrGLSLExpr4(inputColor) * GrGLSLExpr1("edgeAlpha")).c_str());
+                                   (inputColor * GrGLSLExpr1("edgeAlpha")).c_str());
         }
 
         static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
             const DIEllipseEdgeEffect& ellipseEffect = drawEffect.castEffect<DIEllipseEdgeEffect>();
 
             return ellipseEffect.getMode();
         }
 
         virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE {
         }
@@ skipping 711 matching lines @@
         }
 
         // drop out the middle quad if we're stroked
         int indexCnt = isStroked ? GR_ARRAY_COUNT(gRRectIndices)-6 : GR_ARRAY_COUNT(gRRectIndices);
         target->setIndexSourceToBuffer(indexBuffer);
         target->drawIndexed(kTriangles_GrPrimitiveType, 0, 0, 16, indexCnt, &bounds);
     }
 
     return true;
 }