Change SkShader;asFragmentProcessor signature to no longer take skpaint\grcolor*

src/effects/SkPerlinNoiseShader.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 "SkDither.h"
 #include "SkPerlinNoiseShader.h"
 #include "SkColorFilter.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkShader.h"
 #include "SkUnPreMultiply.h"
 #include "SkString.h"
 
 #if SK_SUPPORT_GPU
 #include "GrContext.h"
 #include "GrCoordTransform.h"
 #include "GrInvariantOutput.h"
 #include "SkGr.h"
+#include "effects/GrConstColorProcessor.h"
+#include "effects/GrExtractAlphaFragmentProcessor.h"
 #include "gl/GrGLFragmentProcessor.h"
 #include "gl/builders/GrGLProgramBuilder.h"
 #endif
 
 static const int kBlockSize = 256;
 static const int kBlockMask = kBlockSize - 1;
 static const int kPerlinNoise = 4096;
 static const int kRandMaximum = SK_MaxS32; // 2**31 - 1
 
 namespace {
@@ skipping 461 matching lines @@
 protected:
     void onSetData(const GrGLProgramDataManager&, const GrProcessor&) override;
 
 private:
 
     GrGLProgramDataManager::UniformHandle fStitchDataUni;
     SkPerlinNoiseShader::Type             fType;
     bool                                  fStitchTiles;
     int                                   fNumOctaves;
     GrGLProgramDataManager::UniformHandle fBaseFrequencyUni;
-    GrGLProgramDataManager::UniformHandle fAlphaUni;
 
 private:
     typedef GrGLFragmentProcessor INHERITED;
 };
 
 /////////////////////////////////////////////////////////////////////
 
 class GrPerlinNoiseEffect : public GrFragmentProcessor {
 public:
     static GrFragmentProcessor* Create(GrProcessorDataManager* procDataManager,
                                        SkPerlinNoiseShader::Type type,
                                        int numOctaves, bool stitchTiles,
                                        SkPerlinNoiseShader::PaintingData* paintingData,
                                        GrTexture* permutationsTexture, GrTexture* noiseTexture,
-                                       const SkMatrix& matrix, uint8_t alpha) {
+                                       const SkMatrix& matrix) {
         return new GrPerlinNoiseEffect(procDataManager, type, numOctaves, stitchTiles, paintingData,
-                                       permutationsTexture, noiseTexture, matrix, alpha);
+                                       permutationsTexture, noiseTexture, matrix);
     }
 
     virtual ~GrPerlinNoiseEffect() { delete fPaintingData; }
 
     const char* name() const override { return "PerlinNoise"; }
 
     const SkPerlinNoiseShader::StitchData& stitchData() const { return fPaintingData->fStitchDataInit; }
 
     SkPerlinNoiseShader::Type type() const { return fType; }
     bool stitchTiles() const { return fStitchTiles; }
     const SkVector& baseFrequency() const { return fPaintingData->fBaseFrequency; }
     int numOctaves() const { return fNumOctaves; }
     const SkMatrix& matrix() const { return fCoordTransform.getMatrix(); }
-    uint8_t alpha() const { return fAlpha; }
 
 private:
     GrGLFragmentProcessor* onCreateGLInstance() const override {
         return new GrGLPerlinNoise(*this);
     }
 
     virtual void onGetGLProcessorKey(const GrGLSLCaps& caps,
                                      GrProcessorKeyBuilder* b) const override {
         GrGLPerlinNoise::GenKey(*this, caps, b);
     }
 
     bool onIsEqual(const GrFragmentProcessor& sBase) const override {
         const GrPerlinNoiseEffect& s = sBase.cast<GrPerlinNoiseEffect>();
         return fType == s.fType &&
                fPaintingData->fBaseFrequency == s.fPaintingData->fBaseFrequency &&
                fNumOctaves == s.fNumOctaves &&
                fStitchTiles == s.fStitchTiles &&
-               fAlpha == s.fAlpha &&
                fPaintingData->fStitchDataInit == s.fPaintingData->fStitchDataInit;
     }
 
     void onComputeInvariantOutput(GrInvariantOutput* inout) const override {
         inout->setToUnknown(GrInvariantOutput::kWillNot_ReadInput);
     }
 
     GrPerlinNoiseEffect(GrProcessorDataManager*, SkPerlinNoiseShader::Type type,
                         int numOctaves, bool stitchTiles,
                         SkPerlinNoiseShader::PaintingData* paintingData,
                         GrTexture* permutationsTexture, GrTexture* noiseTexture,
-                        const SkMatrix& matrix, uint8_t alpha)
+                        const SkMatrix& matrix)
       : fType(type)
       , fNumOctaves(numOctaves)
       , fStitchTiles(stitchTiles)
-      , fAlpha(alpha)
       , fPermutationsAccess(permutationsTexture)
       , fNoiseAccess(noiseTexture)
       , fPaintingData(paintingData) {
         this->initClassID<GrPerlinNoiseEffect>();
         this->addTextureAccess(&fPermutationsAccess);
         this->addTextureAccess(&fNoiseAccess);
         fCoordTransform.reset(kLocal_GrCoordSet, matrix);
         this->addCoordTransform(&fCoordTransform);
     }
 
     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
 
     SkPerlinNoiseShader::Type       fType;
     GrCoordTransform                fCoordTransform;
     int                             fNumOctaves;
     bool                            fStitchTiles;
-    uint8_t                         fAlpha;
     GrTextureAccess                 fPermutationsAccess;
     GrTextureAccess                 fNoiseAccess;
     SkPerlinNoiseShader::PaintingData *fPaintingData;
 
 private:
     typedef GrFragmentProcessor INHERITED;
 };
 
 /////////////////////////////////////////////////////////////////////
 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrPerlinNoiseEffect);
 
-GrFragmentProcessor* GrPerlinNoiseEffect::TestCreate(GrProcessorTestData* d) {
+const GrFragmentProcessor* GrPerlinNoiseEffect::TestCreate(GrProcessorTestData* d) {
     int      numOctaves = d->fRandom->nextRangeU(2, 10);
     bool     stitchTiles = d->fRandom->nextBool();
     SkScalar seed = SkIntToScalar(d->fRandom->nextU());
     SkISize  tileSize = SkISize::Make(d->fRandom->nextRangeU(4, 4096),
                                       d->fRandom->nextRangeU(4, 4096));
     SkScalar baseFrequencyX = d->fRandom->nextRangeScalar(0.01f,
                                                           0.99f);
     SkScalar baseFrequencyY = d->fRandom->nextRangeScalar(0.01f,
                                                           0.99f);
 
     SkShader* shader = d->fRandom->nextBool() ?
         SkPerlinNoiseShader::CreateFractalNoise(baseFrequencyX, baseFrequencyY, numOctaves, seed,
                                                 stitchTiles ? &tileSize : nullptr) :
         SkPerlinNoiseShader::CreateTurbulence(baseFrequencyX, baseFrequencyY, numOctaves, seed,
                                              stitchTiles ? &tileSize : nullptr);
 
-    SkPaint paint;
-    GrColor paintColor;
     GrFragmentProcessor* effect;
     GrPaint grPaint;
-    SkAssertResult(shader->asFragmentProcessor(d->fContext, paint,
-                                               GrTest::TestMatrix(d->fRandom), nullptr,
-                                               &paintColor, grPaint.getProcessorDataManager(),
-                                               &effect));
+    return shader->asFragmentProcessor(d->fContext,
+                                       GrTest::TestMatrix(d->fRandom), NULL,
+                                       kNone_SkFilterQuality,
+                                       grPaint.getProcessorDataManager());
 
     delete shader;
 
     return effect;
 }
 
 GrGLPerlinNoise::GrGLPerlinNoise(const GrProcessor& processor)
   : fType(processor.cast<GrPerlinNoiseEffect>().type())
   , fStitchTiles(processor.cast<GrPerlinNoiseEffect>().stitchTiles())
   , fNumOctaves(processor.cast<GrPerlinNoiseEffect>().numOctaves()) {
 }
 
 void GrGLPerlinNoise::emitCode(EmitArgs& args) {
     GrGLFragmentBuilder* fsBuilder = args.fBuilder->getFragmentShaderBuilder();
     SkString vCoords = fsBuilder->ensureFSCoords2D(args.fCoords, 0);
 
     fBaseFrequencyUni = args.fBuilder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
                                             kVec2f_GrSLType, kDefault_GrSLPrecision,
                                             "baseFrequency");
     const char* baseFrequencyUni = args.fBuilder->getUniformCStr(fBaseFrequencyUni);
-    fAlphaUni = args.fBuilder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
-                                    kFloat_GrSLType, kDefault_GrSLPrecision,
-                                    "alpha");
-    const char* alphaUni = args.fBuilder->getUniformCStr(fAlphaUni);
 
     const char* stitchDataUni = nullptr;
     if (fStitchTiles) {
         fStitchDataUni = args.fBuilder->addUniform(GrGLProgramBuilder::kFragment_Visibility,
                                              kVec2f_GrSLType, kDefault_GrSLPrecision,
                                              "stitchData");
         stitchDataUni = args.fBuilder->getUniformCStr(fStitchDataUni);
     }
 
     // There are 4 lines, so the center of each line is 1/8, 3/8, 5/8 and 7/8
@@ skipping 212 matching lines @@
     }
     fsBuilder->codeAppend("\n\t\t}"); // end of the for loop on octaves
 
     if (fType == SkPerlinNoiseShader::kFractalNoise_Type) {
         // The value of turbulenceFunctionResult comes from ((turbulenceFunctionResult) + 1) / 2
         // by fractalNoise and (turbulenceFunctionResult) by turbulence.
         fsBuilder->codeAppendf("\n\t\t%s = %s * vec4(0.5) + vec4(0.5);",
                                args.fOutputColor,args.fOutputColor);
     }
 
-    fsBuilder->codeAppendf("\n\t\t%s.a *= %s;", args.fOutputColor, alphaUni);
-
     // Clamp values
     fsBuilder->codeAppendf("\n\t\t%s = clamp(%s, 0.0, 1.0);", args.fOutputColor, args.fOutputColor);
 
     // Pre-multiply the result
     fsBuilder->codeAppendf("\n\t\t%s = vec4(%s.rgb * %s.aaa, %s.a);\n",
                            args.fOutputColor, args.fOutputColor,
                            args.fOutputColor, args.fOutputColor);
 }
 
 void GrGLPerlinNoise::GenKey(const GrProcessor& processor, const GrGLSLCaps&,
@@ skipping 23 matching lines @@
     b->add32(key);
 }
 
 void GrGLPerlinNoise::onSetData(const GrGLProgramDataManager& pdman, const GrProcessor& processor) {
     INHERITED::onSetData(pdman, processor);
 
     const GrPerlinNoiseEffect& turbulence = processor.cast<GrPerlinNoiseEffect>();
 
     const SkVector& baseFrequency = turbulence.baseFrequency();
     pdman.set2f(fBaseFrequencyUni, baseFrequency.fX, baseFrequency.fY);
-    pdman.set1f(fAlphaUni, SkIntToScalar(turbulence.alpha()) / 255);
 
     if (turbulence.stitchTiles()) {
         const SkPerlinNoiseShader::StitchData& stitchData = turbulence.stitchData();
         pdman.set2f(fStitchDataUni, SkIntToScalar(stitchData.fWidth),
                                    SkIntToScalar(stitchData.fHeight));
     }
 }
 
 /////////////////////////////////////////////////////////////////////
-
-bool SkPerlinNoiseShader::asFragmentProcessor(GrContext* context, const SkPaint& paint,
-                                              const SkMatrix& viewM,
-                                              const SkMatrix* externalLocalMatrix,
-                                              GrColor* paintColor,
-                                              GrProcessorDataManager* procDataManager,
-                                              GrFragmentProcessor** fp) const {
+const GrFragmentProcessor* SkPerlinNoiseShader::asFragmentProcessor(GrContext* context,
+    const SkMatrix& viewM, const SkMatrix* externalLocalMatrix, SkFilterQuality,
+    GrProcessorDataManager* procDataManager) const {
     SkASSERT(context);
 
-    *paintColor = SkColor2GrColorJustAlpha(paint.getColor());
-
     SkMatrix localMatrix = this->getLocalMatrix();
     if (externalLocalMatrix) {
         localMatrix.preConcat(*externalLocalMatrix);
     }
 
     SkMatrix matrix = viewM;
     matrix.preConcat(localMatrix);
 
     if (0 == fNumOctaves) {
         if (kFractalNoise_Type == fType) {
-            uint32_t alpha = paint.getAlpha() >> 1;
-            uint32_t rgb = alpha >> 1;
-            *paintColor = GrColorPackRGBA(rgb, rgb, rgb, alpha);
-        } else {
-            *paintColor = 0;
+            // Extract the incoming alpha and emit rgba = (a/4, a/4, a/4, a/2)
+            SkAutoTUnref<const GrFragmentProcessor> inner(
+                GrConstColorProcessor::Create(0x80404040,
+                                              GrConstColorProcessor::kModulateRGBA_InputMode));
+            return GrExtractAlphaFragmentProcessor::Create(inner);
         }
-        return true;
+        // Emit zero.
+        return GrConstColorProcessor::Create(0x0, GrConstColorProcessor::kIgnore_InputMode);
     }
 
     // Either we don't stitch tiles, either we have a valid tile size
     SkASSERT(!fStitchTiles || !fTileSize.isEmpty());
 
     SkPerlinNoiseShader::PaintingData* paintingData =
             new PaintingData(fTileSize, fSeed, fBaseFrequencyX, fBaseFrequencyY, matrix);
     SkAutoTUnref<GrTexture> permutationsTexture(
         GrRefCachedBitmapTexture(context, paintingData->getPermutationsBitmap(), nullptr));
     SkAutoTUnref<GrTexture> noiseTexture(
         GrRefCachedBitmapTexture(context, paintingData->getNoiseBitmap(), nullptr));
 
     SkMatrix m = viewM;
     m.setTranslateX(-localMatrix.getTranslateX() + SK_Scalar1);
     m.setTranslateY(-localMatrix.getTranslateY() + SK_Scalar1);
     if ((permutationsTexture) && (noiseTexture)) {
-        *fp = GrPerlinNoiseEffect::Create(procDataManager,
-                                          fType,
-                                          fNumOctaves,
-                                          fStitchTiles,
-                                          paintingData,
-                                          permutationsTexture, noiseTexture,
-                                          m, paint.getAlpha());
-    } else {
-        delete paintingData;
-        *fp = nullptr;
+        SkAutoTUnref<GrFragmentProcessor> inner(
+            GrPerlinNoiseEffect::Create(procDataManager,
+                                        fType,
+                                        fNumOctaves,
+                                        fStitchTiles,
+                                        paintingData,
+                                        permutationsTexture, noiseTexture,
+                                        m));
+        return GrExtractAlphaFragmentProcessor::Create(inner);
     }
-    return true;
-}
-
-#else
-
-bool SkPerlinNoiseShader::asFragmentProcessor(GrContext*, const SkPaint&, const SkMatrix&,
-                                              const SkMatrix*, GrColor*, GrProcessorDataManager*,
-                                              GrFragmentProcessor**) const {
-    SkDEBUGFAIL("Should not call in GPU-less build");
-    return false;
+    delete paintingData;
+    return nullptr;
 }
 
 #endif
 
 #ifndef SK_IGNORE_TO_STRING
 void SkPerlinNoiseShader::toString(SkString* str) const {
     str->append("SkPerlinNoiseShader: (");
 
     str->append("type: ");
     switch (fType) {
@@ skipping 16 matching lines @@
     str->append(" seed: ");
     str->appendScalar(fSeed);
     str->append(" stitch tiles: ");
     str->append(fStitchTiles ? "true " : "false ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif