Move edge GrEffects to locally defined classes

src/gpu/effects/GrEdgeEffect.cpp

Index: src/gpu/effects/GrEdgeEffect.cpp
===================================================================
--- src/gpu/effects/GrEdgeEffect.cpp	(revision 8491)
+++ src/gpu/effects/GrEdgeEffect.cpp	(working copy)
@@ -1,132 +0,0 @@
-/*
- * 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 "GrEdgeEffect.h"
-#include "gl/GrGLEffect.h"
-#include "gl/GrGLSL.h"
-#include "GrTBackendEffectFactory.h"
-
-class GrGLEdgeEffect : public GrGLEffect {
-public:
-    GrGLEdgeEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&)
-    : INHERITED (factory) {}
-
-    virtual void emitCode(GrGLShaderBuilder* builder,
-                          const GrDrawEffect& drawEffect,
-                          EffectKey key,
-                          const char* outputColor,
-                          const char* inputColor,
-                          const TextureSamplerArray& samplers) SK_OVERRIDE {
-        const GrEdgeEffect& edgeEffect = drawEffect.castEffect<GrEdgeEffect>();
-        GrEdgeEffect::EdgeType type = edgeEffect.edgeType();
-
-        const char *vsName, *fsName;
-        const SkString* attrName =
-            builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[0]);
-        builder->fsCodeAppendf("\t\tfloat edgeAlpha;\n");
-
-        switch (type) {
-        case GrEdgeEffect::kHairLine_EdgeType:
-            builder->addVarying(kVec4f_GrSLType, "HairEdge", &vsName, &fsName);
-
-            builder->fsCodeAppendf("\t\tedgeAlpha = abs(dot(vec3(%s.xy,1), %s.xyz));\n",
-                                   builder->fragmentPosition(), fsName);
-            builder->fsCodeAppendf("\t\tedgeAlpha = max(1.0 - edgeAlpha, 0.0);\n");
-            break;
-        case GrEdgeEffect::kQuad_EdgeType:
-            SkAssertResult(builder->enableFeature(GrGLShaderBuilder::kStandardDerivatives_GLSLFeature));
-            builder->addVarying(kVec4f_GrSLType, "QuadEdge", &vsName, &fsName);
-
-            // keep the derivative instructions outside the conditional
-            builder->fsCodeAppendf("\t\tvec2 duvdx = dFdx(%s.xy);\n", fsName);
-            builder->fsCodeAppendf("\t\tvec2 duvdy = dFdy(%s.xy);\n", fsName);
-            builder->fsCodeAppendf("\t\tif (%s.z > 0.0 && %s.w > 0.0) {\n", fsName, fsName);
-            // today we know z and w are in device space. We could use derivatives
-            builder->fsCodeAppendf("\t\t\tedgeAlpha = min(min(%s.z, %s.w) + 0.5, 1.0);\n", fsName,
-                                   fsName);
-            builder->fsCodeAppendf ("\t\t} else {\n");
-            builder->fsCodeAppendf("\t\t\tvec2 gF = vec2(2.0*%s.x*duvdx.x - duvdx.y,\n"
-                                   "\t\t\t               2.0*%s.x*duvdy.x - duvdy.y);\n",
-                                    fsName, fsName);
-            builder->fsCodeAppendf("\t\t\tedgeAlpha = (%s.x*%s.x - %s.y);\n", fsName, fsName,
-                                   fsName);
-            builder->fsCodeAppendf("\t\t\tedgeAlpha = "
-                                   "clamp(0.5 - edgeAlpha / length(gF), 0.0, 1.0);\n\t\t}\n");
-            break;
-        case GrEdgeEffect::kHairQuad_EdgeType:
-            SkAssertResult(builder->enableFeature(GrGLShaderBuilder::kStandardDerivatives_GLSLFeature));
-            builder->addVarying(kVec4f_GrSLType, "HairQuadEdge", &vsName, &fsName);
-
-            builder->fsCodeAppendf("\t\tvec2 duvdx = dFdx(%s.xy);\n", fsName);
-            builder->fsCodeAppendf("\t\tvec2 duvdy = dFdy(%s.xy);\n", fsName);
-            builder->fsCodeAppendf("\t\tvec2 gF = vec2(2.0*%s.x*duvdx.x - duvdx.y,\n"
-                                   "\t\t               2.0*%s.x*duvdy.x - duvdy.y);\n",
-                                   fsName, fsName);
-            builder->fsCodeAppendf("\t\tedgeAlpha = (%s.x*%s.x - %s.y);\n", fsName, fsName,
-                                   fsName);
-            builder->fsCodeAppend("\t\tedgeAlpha = sqrt(edgeAlpha*edgeAlpha / dot(gF, gF));\n");
-            builder->fsCodeAppend("\t\tedgeAlpha = max(1.0 - edgeAlpha, 0.0);\n");
-            break;
-        };
-
-        SkString modulate;
-        GrGLSLModulate4f(&modulate, inputColor, "edgeAlpha");
-        builder->fsCodeAppendf("\t%s = %s;\n", outputColor, modulate.c_str());
-
-        builder->vsCodeAppendf("\t%s = %s;\n", vsName, attrName->c_str());
-    }
-
-    static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
-        const GrEdgeEffect& QuadEffect = drawEffect.castEffect<GrEdgeEffect>();
-
-        return QuadEffect.edgeType();
-    }
-
-    virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE {
-    }
-
-private:
-    typedef GrGLEffect INHERITED;
-};
-
-///////////////////////////////////////////////////////////////////////////////
-
-GrEdgeEffect::GrEdgeEffect(EdgeType edgeType) : GrEffect() {
-    if (edgeType == kQuad_EdgeType) {
-        this->addVertexAttrib(kVec4f_GrSLType);
-    } else {
-        this->addVertexAttrib(kVec4f_GrSLType);  // TODO: use different vec sizes for differnt edge
-                                                 // types.
-    }
-    fEdgeType = edgeType;
-}
-
-void GrEdgeEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
-    *validFlags = 0;
-}
-
-const GrBackendEffectFactory& GrEdgeEffect::getFactory() const {
-    return GrTBackendEffectFactory<GrEdgeEffect>::getInstance();
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-GR_DEFINE_EFFECT_TEST(GrEdgeEffect);
-
-GrEffectRef* GrEdgeEffect::TestCreate(SkMWCRandom* random,
-                                      GrContext*,
-                                      const GrDrawTargetCaps& caps,
-                                      GrTexture*[]) {
-    // Only kHairLine works without derivative instructions.
-    EdgeType edgeType;
-    if (caps.shaderDerivativeSupport()) {
-        edgeType = static_cast<EdgeType>(random->nextULessThan(kEdgeTypeCount));
-    } else {
-        edgeType = kHairLine_EdgeType;
-    }
-    return GrEdgeEffect::Create(edgeType);
-}