Make texture domain a helper so that it can be incorporated into other effects.

src/gpu/effects/GrTextureDomainEffect.cpp

Index: src/gpu/effects/GrTextureDomainEffect.cpp
diff --git a/src/gpu/effects/GrTextureDomainEffect.cpp b/src/gpu/effects/GrTextureDomainEffect.cpp
deleted file mode 100644
index 699aa729fd9f04052b0e6b3a77d320b93264cb16..0000000000000000000000000000000000000000
--- a/src/gpu/effects/GrTextureDomainEffect.cpp
+++ /dev/null
@@ -1,221 +0,0 @@
-/*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "GrTextureDomainEffect.h"
-#include "GrSimpleTextureEffect.h"
-#include "GrTBackendEffectFactory.h"
-#include "gl/GrGLEffect.h"
-#include "SkFloatingPoint.h"
-
-class GrGLTextureDomainEffect : public GrGLEffect {
-public:
-    GrGLTextureDomainEffect(const GrBackendEffectFactory&, const GrDrawEffect&);
-
-    virtual void emitCode(GrGLShaderBuilder*,
-                          const GrDrawEffect&,
-                          EffectKey,
-                          const char* outputColor,
-                          const char* inputColor,
-                          const TransformedCoordsArray&,
-                          const TextureSamplerArray&) SK_OVERRIDE;
-
-    virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE;
-
-    static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&);
-
-private:
-    GrGLUniformManager::UniformHandle fNameUni;
-    GrGLfloat                         fPrevDomain[4];
-
-    typedef GrGLEffect INHERITED;
-};
-
-GrGLTextureDomainEffect::GrGLTextureDomainEffect(const GrBackendEffectFactory& factory,
-                                                 const GrDrawEffect&)
-    : INHERITED(factory) {
-    fPrevDomain[0] = SK_FloatNaN;
-}
-
-void GrGLTextureDomainEffect::emitCode(GrGLShaderBuilder* builder,
-                                       const GrDrawEffect& drawEffect,
-                                       EffectKey key,
-                                       const char* outputColor,
-                                       const char* inputColor,
-                                       const TransformedCoordsArray& coords,
-                                       const TextureSamplerArray& samplers) {
-    const GrTextureDomainEffect& texDom = drawEffect.castEffect<GrTextureDomainEffect>();
-
-    SkString coords2D = builder->ensureFSCoords2D(coords, 0);
-    const char* domain;
-    fNameUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
-                                    kVec4f_GrSLType, "TexDom", &domain);
-    if (GrTextureDomainEffect::kClamp_WrapMode == texDom.wrapMode()) {
-
-        builder->fsCodeAppendf("\tvec2 clampCoord = clamp(%s, %s.xy, %s.zw);\n",
-                                coords2D.c_str(), domain, domain);
-
-        builder->fsCodeAppendf("\t%s = ", outputColor);
-        builder->fsAppendTextureLookupAndModulate(inputColor, samplers[0], "clampCoord");
-        builder->fsCodeAppend(";\n");
-    } else {
-        SkASSERT(GrTextureDomainEffect::kDecal_WrapMode == texDom.wrapMode());
-
-        if (kImagination_GrGLVendor == builder->ctxInfo().vendor()) {
-            // On the NexusS and GalaxyNexus, the other path (with the 'any'
-            // call) causes the compilation error "Calls to any function that
-            // may require a gradient calculation inside a conditional block
-            // may return undefined results". This appears to be an issue with
-            // the 'any' call since even the simple "result=black; if (any())
-            // result=white;" code fails to compile.
-            builder->fsCodeAppend("\tvec4 outside = vec4(0.0, 0.0, 0.0, 0.0);\n");
-            builder->fsCodeAppend("\tvec4 inside = ");
-            builder->fsAppendTextureLookupAndModulate(inputColor, samplers[0], coords2D.c_str());
-            builder->fsCodeAppend(";\n");
-
-            builder->fsCodeAppendf("\tfloat x = abs(2.0*(%s.x - %s.x)/(%s.z - %s.x) - 1.0);\n",
-                                   coords2D.c_str(), domain, domain, domain);
-            builder->fsCodeAppendf("\tfloat y = abs(2.0*(%s.y - %s.y)/(%s.w - %s.y) - 1.0);\n",
-                                   coords2D.c_str(), domain, domain, domain);
-            builder->fsCodeAppend("\tfloat blend = step(1.0, max(x, y));\n");
-            builder->fsCodeAppendf("\t%s = mix(inside, outside, blend);\n", outputColor);
-        } else {
-            builder->fsCodeAppend("\tbvec4 outside;\n");
-            builder->fsCodeAppendf("\toutside.xy = lessThan(%s, %s.xy);\n", coords2D.c_str(), domain);
-            builder->fsCodeAppendf("\toutside.zw = greaterThan(%s, %s.zw);\n", coords2D.c_str(), domain);
-            builder->fsCodeAppendf("\t%s = any(outside) ? vec4(0.0, 0.0, 0.0, 0.0) : ", outputColor);
-            builder->fsAppendTextureLookupAndModulate(inputColor, samplers[0], coords2D.c_str());
-            builder->fsCodeAppend(";\n");
-        }
-    }
-}
-
-void GrGLTextureDomainEffect::setData(const GrGLUniformManager& uman,
-                                      const GrDrawEffect& drawEffect) {
-    const GrTextureDomainEffect& texDom = drawEffect.castEffect<GrTextureDomainEffect>();
-    const SkRect& domain = texDom.domain();
-
-    float values[4] = {
-        SkScalarToFloat(domain.left()),
-        SkScalarToFloat(domain.top()),
-        SkScalarToFloat(domain.right()),
-        SkScalarToFloat(domain.bottom())
-    };
-    // vertical flip if necessary
-    if (kBottomLeft_GrSurfaceOrigin == texDom.texture(0)->origin()) {
-        values[1] = 1.0f - values[1];
-        values[3] = 1.0f - values[3];
-        // The top and bottom were just flipped, so correct the ordering
-        // of elements so that values = (l, t, r, b).
-        SkTSwap(values[1], values[3]);
-    }
-    if (0 != memcmp(values, fPrevDomain, 4 * sizeof(GrGLfloat))) {
-        uman.set4fv(fNameUni, 1, values);
-        memcpy(fPrevDomain, values, 4 * sizeof(GrGLfloat));
-    }
-}
-
-GrGLEffect::EffectKey GrGLTextureDomainEffect::GenKey(const GrDrawEffect& drawEffect,
-                                                      const GrGLCaps&) {
-    return drawEffect.castEffect<GrTextureDomainEffect>().wrapMode();
-}
-
-
-///////////////////////////////////////////////////////////////////////////////
-
-GrEffectRef* GrTextureDomainEffect::Create(GrTexture* texture,
-                                           const SkMatrix& matrix,
-                                           const SkRect& domain,
-                                           WrapMode wrapMode,
-                                           GrTextureParams::FilterMode filterMode,
-                                           GrCoordSet coordSet) {
-    static const SkRect kFullRect = {0, 0, SK_Scalar1, SK_Scalar1};
-    if (kClamp_WrapMode == wrapMode && domain.contains(kFullRect)) {
-        return GrSimpleTextureEffect::Create(texture, matrix, filterMode);
-    } else {
-        SkRect clippedDomain;
-        // We don't currently handle domains that are empty or don't intersect the texture.
-        // It is OK if the domain rect is a line or point, but it should not be inverted. We do not
-        // handle rects that do not intersect the [0..1]x[0..1] rect.
-        SkASSERT(domain.fLeft <= domain.fRight);
-        SkASSERT(domain.fTop <= domain.fBottom);
-        clippedDomain.fLeft = SkMaxScalar(domain.fLeft, kFullRect.fLeft);
-        clippedDomain.fRight = SkMinScalar(domain.fRight, kFullRect.fRight);
-        clippedDomain.fTop = SkMaxScalar(domain.fTop, kFullRect.fTop);
-        clippedDomain.fBottom = SkMinScalar(domain.fBottom, kFullRect.fBottom);
-        SkASSERT(clippedDomain.fLeft <= clippedDomain.fRight);
-        SkASSERT(clippedDomain.fTop <= clippedDomain.fBottom);
-
-        AutoEffectUnref effect(SkNEW_ARGS(GrTextureDomainEffect, (texture,
-                                                                  matrix,
-                                                                  clippedDomain,
-                                                                  wrapMode,
-                                                                  filterMode,
-                                                                  coordSet)));
-        return CreateEffectRef(effect);
-
-    }
-}
-
-GrTextureDomainEffect::GrTextureDomainEffect(GrTexture* texture,
-                                             const SkMatrix& matrix,
-                                             const SkRect& domain,
-                                             WrapMode wrapMode,
-                                             GrTextureParams::FilterMode filterMode,
-                                             GrCoordSet coordSet)
-    : GrSingleTextureEffect(texture, matrix, filterMode, coordSet)
-    , fWrapMode(wrapMode)
-    , fTextureDomain(domain) {
-}
-
-GrTextureDomainEffect::~GrTextureDomainEffect() {
-
-}
-
-const GrBackendEffectFactory& GrTextureDomainEffect::getFactory() const {
-    return GrTBackendEffectFactory<GrTextureDomainEffect>::getInstance();
-}
-
-bool GrTextureDomainEffect::onIsEqual(const GrEffect& sBase) const {
-    const GrTextureDomainEffect& s = CastEffect<GrTextureDomainEffect>(sBase);
-    return this->hasSameTextureParamsMatrixAndSourceCoords(s) &&
-           this->fTextureDomain == s.fTextureDomain;
-}
-
-void GrTextureDomainEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
-    if (kDecal_WrapMode == fWrapMode) {
-        *validFlags = 0;
-    } else {
-        this->updateConstantColorComponentsForModulation(color, validFlags);
-    }
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-GR_DEFINE_EFFECT_TEST(GrTextureDomainEffect);
-
-GrEffectRef* GrTextureDomainEffect::TestCreate(SkRandom* random,
-                                               GrContext*,
-                                               const GrDrawTargetCaps&,
-                                               GrTexture* textures[]) {
-    int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx :
-                                      GrEffectUnitTest::kAlphaTextureIdx;
-    SkRect domain;
-    domain.fLeft = random->nextUScalar1();
-    domain.fRight = random->nextRangeScalar(domain.fLeft, SK_Scalar1);
-    domain.fTop = random->nextUScalar1();
-    domain.fBottom = random->nextRangeScalar(domain.fTop, SK_Scalar1);
-    WrapMode wrapMode = random->nextBool() ? kClamp_WrapMode : kDecal_WrapMode;
-    const SkMatrix& matrix = GrEffectUnitTest::TestMatrix(random);
-    bool bilerp = random->nextBool();
-    GrCoordSet coords = random->nextBool() ? kLocal_GrCoordSet : kPosition_GrCoordSet;
-    return GrTextureDomainEffect::Create(textures[texIdx],
-                                         matrix,
-                                         domain,
-                                         wrapMode,
-                                         bilerp ? GrTextureParams::kBilerp_FilterMode : GrTextureParams::kNone_FilterMode,
-                                         coords);
-}