Add GrAASmallPathRenderer.

src/gpu/effects/GrDistanceFieldTextureEffect.cpp

Index: src/gpu/effects/GrDistanceFieldTextureEffect.cpp
diff --git a/src/gpu/effects/GrDistanceFieldTextureEffect.cpp b/src/gpu/effects/GrDistanceFieldTextureEffect.cpp
index d5d334805c105eb56012bf8729353df9b1b99655..54287e52bd7baf245b596304fb26904ed2a56f24 100755
--- a/src/gpu/effects/GrDistanceFieldTextureEffect.cpp
+++ b/src/gpu/effects/GrDistanceFieldTextureEffect.cpp
@@ -261,6 +261,184 @@ GrGeometryProcessor* GrDistanceFieldTextureEffect::TestCreate(SkRandom* random,
 
 ///////////////////////////////////////////////////////////////////////////////
 
+class GrGLDistanceFieldNoGammaTextureEffect : public GrGLGeometryProcessor {
+public:
+    GrGLDistanceFieldNoGammaTextureEffect(const GrBackendProcessorFactory& factory,

[robertphillips, 2014/09/26 14:00:31]

line this up ?

[jvanverth1, 2014/10/03 17:28:23]

Done.

+        const GrProcessor& effect)
+        : INHERITED(factory)
+        , fTextureSize(SkISize::Make(-1, -1))

[robertphillips, 2014/09/26 14:00:30]

Have you switched over to Mike R.'s bracket style ?

[jvanverth1, 2014/10/03 17:28:23]

Done.

+    {}
+
+    virtual void emitCode(GrGLFullProgramBuilder* builder,

[robertphillips, 2014/09/26 14:00:31]

line up ?

[jvanverth1, 2014/10/03 17:28:23]

Done.

+        const GrGeometryProcessor& effect,
+        const GrProcessorKey& key,
+        const char* outputColor,
+        const char* inputColor,
+        const TransformedCoordsArray&,
+        const TextureSamplerArray& samplers) SK_OVERRIDE{
+        const GrDistanceFieldNoGammaTextureEffect& dfTexEffect =

[robertphillips, 2014/09/26 14:00:31]

tab over ?

[jvanverth1, 2014/10/03 17:28:23]

Done.

+        effect.cast<GrDistanceFieldNoGammaTextureEffect>();
+        SkASSERT(1 == dfTexEffect.getVertexAttribs().count());
+
+        GrGLProcessorFragmentShaderBuilder* fsBuilder = builder->getFragmentShaderBuilder();
+        SkAssertResult(fsBuilder->enableFeature(
+            GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
+
+        SkString fsCoordName;
+        const char* vsCoordName;
+        const char* fsCoordNamePtr;
+        builder->addVarying(kVec2f_GrSLType, "textureCoords", &vsCoordName, &fsCoordNamePtr);
+        fsCoordName = fsCoordNamePtr;
+
+        GrGLVertexShaderBuilder* vsBuilder = builder->getVertexShaderBuilder();

[robertphillips, 2014/09/26 14:00:30]

rm '\t's and '\n's ?

[jvanverth1, 2014/10/03 17:28:24]

Done.

+        vsBuilder->codeAppendf("\t%s = %s;\n", vsCoordName, dfTexEffect.inTextureCoords().c_str());
+
+        const char* textureSizeUniName = NULL;
+        fTextureSizeUni = builder->addUniform(GrGLProgramBuilder::kFragment_Visibility,

[robertphillips, 2014/09/26 14:00:30]

line up ?

[jvanverth1, 2014/10/03 17:28:23]

Done.

+            kVec2f_GrSLType, "TextureSize",
+            &textureSizeUniName);
+
+        fsBuilder->codeAppend("\tvec4 texColor = ");
+        fsBuilder->appendTextureLookup(samplers[0],
+            fsCoordName.c_str(),
+            kVec2f_GrSLType);
+        fsBuilder->codeAppend(";\n");
+        fsBuilder->codeAppend("\tfloat distance = "
+            SK_DistanceFieldMultiplier "*(texColor.r - " SK_DistanceFieldThreshold ")"
+            "+ " SK_DistanceFieldNonLCDFactor ";\n");
+
+        // we adjust for the effect of the transformation on the distance by using
+        // the length of the gradient of the texture coordinates. We use st coordinates
+        // to ensure we're mapping 1:1 from texel space to pixel space.
+        fsBuilder->codeAppendf("\tvec2 uv = %s;\n", fsCoordName.c_str());
+        fsBuilder->codeAppendf("\tvec2 st = uv*%s;\n", textureSizeUniName);
+        fsBuilder->codeAppend("\tfloat afwidth;\n");
+        if (dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag) {
+            // this gives us a smooth step across approximately one fragment
+            fsBuilder->codeAppend("\tafwidth = " SK_DistanceFieldAAFactor "*dFdx(st.x);\n");
+        }
+        else {
+            fsBuilder->codeAppend("\tvec2 Jdx = dFdx(st);\n");
+            fsBuilder->codeAppend("\tvec2 Jdy = dFdy(st);\n");
+
+            fsBuilder->codeAppend("\tvec2 uv_grad;\n");
+            if (builder->ctxInfo().caps()->dropsTileOnZeroDivide()) {
+                // this is to compensate for the Adreno, which likes to drop tiles on division by 0
+                fsBuilder->codeAppend("\tfloat uv_len2 = dot(uv, uv);\n");
+                fsBuilder->codeAppend("\tif (uv_len2 < 0.0001) {\n");
+                fsBuilder->codeAppend("\t\tuv_grad = vec2(0.7071, 0.7071);\n");
+                fsBuilder->codeAppend("\t} else {\n");
+                fsBuilder->codeAppend("\t\tuv_grad = uv*inversesqrt(uv_len2);\n");
+                fsBuilder->codeAppend("\t}\n");
+            }
+            else {
+                fsBuilder->codeAppend("\tuv_grad = normalize(uv);\n");
+            }
+            fsBuilder->codeAppend("\tvec2 grad = vec2(uv_grad.x*Jdx.x + uv_grad.y*Jdy.x,\n");
+            fsBuilder->codeAppend("\t                 uv_grad.x*Jdx.y + uv_grad.y*Jdy.y);\n");
+
+            // this gives us a smooth step across approximately one fragment
+            fsBuilder->codeAppend("\tafwidth = " SK_DistanceFieldAAFactor "*length(grad);\n");
+        }
+        fsBuilder->codeAppend("\tfloat val = smoothstep(-afwidth, afwidth, distance);\n");
+
+        fsBuilder->codeAppendf("\t%s = %s;\n", outputColor,
+            (GrGLSLExpr4(inputColor) * GrGLSLExpr1("val")).c_str());
+    }
+
+    virtual void setData(const GrGLProgramDataManager& pdman,

[robertphillips, 2014/09/26 14:00:31]

line up ?

[jvanverth1, 2014/10/03 17:28:24]

Done.

+        const GrProcessor& effect) SK_OVERRIDE{
+        SkASSERT(fTextureSizeUni.isValid());
+
+        GrTexture* texture = effect.texture(0);

[robertphillips, 2014/09/26 14:00:31]

one line ?

[jvanverth1, 2014/10/03 17:28:23]

Too wide...

+        if (texture->width() != fTextureSize.width() ||
+            texture->height() != fTextureSize.height()) {
+            fTextureSize = SkISize::Make(texture->width(), texture->height());
+            pdman.set2f(fTextureSizeUni,

[robertphillips, 2014/09/26 14:00:31]

line up ?

[jvanverth1, 2014/10/03 17:28:23]

Done.

+                SkIntToScalar(fTextureSize.width()),
+                SkIntToScalar(fTextureSize.height()));
+        }
+    }
+
+    static inline void GenKey(const GrProcessor& effect, const GrGLCaps&,

[robertphillips, 2014/09/26 14:00:31]

line up ?

[jvanverth1, 2014/10/03 17:28:23]

Done.

+        GrProcessorKeyBuilder* b) {
+        const GrDistanceFieldNoGammaTextureEffect& dfTexEffect =
+            effect.cast<GrDistanceFieldNoGammaTextureEffect>();
+
+        b->add32(dfTexEffect.getFlags());
+    }
+
+private:
+    GrGLProgramDataManager::UniformHandle fTextureSizeUni;
+    SkISize                               fTextureSize;
+
+    typedef GrGLGeometryProcessor INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+GrDistanceFieldNoGammaTextureEffect::GrDistanceFieldNoGammaTextureEffect(GrTexture* texture,
+                                                                    const GrTextureParams& params,
+                                                                    uint32_t flags)
+    : fTextureAccess(texture, params)
+    , fFlags(flags & kNonLCD_DistanceFieldEffectMask)
+    , fInTextureCoords(this->addVertexAttrib(GrShaderVar("inTextureCoords",

[robertphillips, 2014/09/26 14:00:31]

this indenting (or lack thereof) is confusing.

[jvanverth1, 2014/10/03 17:28:23]

Done.

+    kVec2f_GrSLType,
+    GrShaderVar::kAttribute_TypeModifier))) {
+    SkASSERT(!(flags & ~kNonLCD_DistanceFieldEffectMask));
+    this->addTextureAccess(&fTextureAccess);
+}
+
+bool GrDistanceFieldNoGammaTextureEffect::onIsEqual(const GrProcessor& other) const {
+    const GrDistanceFieldNoGammaTextureEffect& cte = other.cast<GrDistanceFieldNoGammaTextureEffect>();

[egdaniel, 2014/09/26 13:30:25]

line wrap

[jvanverth1, 2014/10/03 17:28:24]

Done.

+    return fTextureAccess == cte.fTextureAccess &&

[robertphillips, 2014/09/26 14:00:31]

one line ?

[jvanverth1, 2014/10/03 17:28:23]

Done.

+        fFlags == cte.fFlags;
+}
+
+void GrDistanceFieldNoGammaTextureEffect::getConstantColorComponents(GrColor* color,

[robertphillips, 2014/09/26 14:00:31]

line up?

[jvanverth1, 2014/10/03 17:28:23]

Done.

+    uint32_t* validFlags) const {
+    if ((*validFlags & kA_GrColorComponentFlag) && 0xFF == GrColorUnpackA(*color) &&
+        GrPixelConfigIsOpaque(this->texture(0)->config())) {
+        *validFlags = kA_GrColorComponentFlag;
+    }

[robertphillips, 2014/09/26 14:00:31]

put else on prior line ?

[jvanverth1, 2014/10/03 17:28:23]

Done.

+    else {
+        *validFlags = 0;
+    }
+}
+
+const GrBackendGeometryProcessorFactory& GrDistanceFieldNoGammaTextureEffect::getFactory() const {
+    return GrTBackendGeometryProcessorFactory<GrDistanceFieldNoGammaTextureEffect>::getInstance();
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrDistanceFieldNoGammaTextureEffect);
+
+GrGeometryProcessor* GrDistanceFieldNoGammaTextureEffect::TestCreate(SkRandom* random,

[robertphillips, 2014/09/26 14:00:31]

line up ?

[jvanverth1, 2014/10/03 17:28:23]

Done.

+    GrContext*,
+    const GrDrawTargetCaps&,
+    GrTexture* textures[]) {

[robertphillips, 2014/09/26 14:00:30]

put ':' on next line and line up with '?' ?

[jvanverth1, 2014/10/03 17:28:23]

Done.

+    int texIdx = random->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx :
+        GrProcessorUnitTest::kAlphaTextureIdx;
+    static const SkShader::TileMode kTileModes[] = {
+        SkShader::kClamp_TileMode,
+        SkShader::kRepeat_TileMode,
+        SkShader::kMirror_TileMode,
+    };
+    SkShader::TileMode tileModes[] = {
+        kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))],
+        kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))],
+    };
+    GrTextureParams params(tileModes, random->nextBool() ? GrTextureParams::kBilerp_FilterMode :

[robertphillips, 2014/09/26 14:00:30]

same here with ':' and '?' ?

[jvanverth1, 2014/10/03 17:28:24]

Done.

+        GrTextureParams::kNone_FilterMode);
+
+    return GrDistanceFieldNoGammaTextureEffect::Create(textures[texIdx], params,
+        random->nextBool() ?
+    kSimilarity_DistanceFieldEffectFlag : 0);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
 class GrGLDistanceFieldLCDTextureEffect : public GrGLGeometryProcessor {
 public:
     GrGLDistanceFieldLCDTextureEffect(const GrBackendProcessorFactory& factory,