Revert of Add gpu implementation of OverdrawXfermode

src/utils/debugger/SkOverdrawMode.cpp

-/*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkColorPriv.h"
-#include "SkOverdrawMode.h"
-#include "SkString.h"
-#include "SkXfermode.h"
-
-#if SK_SUPPORT_GPU
-#include "GrFragmentProcessor.h"
-#include "GrInvariantOutput.h"
-#include "GrXferProcessor.h"
-#include "glsl/GrGLSLFragmentProcessor.h"
-#include "glsl/GrGLSLFragmentShaderBuilder.h"
-#include "glsl/GrGLSLXferProcessor.h"
-
- ///////////////////////////////////////////////////////////////////////////////
- // Fragment Processor
- ///////////////////////////////////////////////////////////////////////////////
-
-class GLOverdrawFP;
-
-class GrOverdrawFP : public GrFragmentProcessor {
-public:
-    static const GrFragmentProcessor* Create(const GrFragmentProcessor* dst) {
-        return new GrOverdrawFP(dst);
-    }
-
-    ~GrOverdrawFP() override { }
-
-    const char* name() const override { return "Overdraw"; }
-
-    SkString dumpInfo() const override {
-        SkString str;
-        return str;
-    }
-
-private:
-    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
-
-    void onGetGLSLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder* b) const override;
-
-    bool onIsEqual(const GrFragmentProcessor&) const override { return true; }
-
-    void onComputeInvariantOutput(GrInvariantOutput* inout) const override {
-        inout->setToUnknown(GrInvariantOutput::kWill_ReadInput);
-    }
-
-    GrOverdrawFP(const GrFragmentProcessor* dst) {
-        this->initClassID<GrOverdrawFP>();
-
-        SkASSERT(dst);
-        SkDEBUGCODE(int dstIndex = )this->registerChildProcessor(dst);
-        SkASSERT(0 == dstIndex);
-    }
-
-    GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
-    typedef GrFragmentProcessor INHERITED;
-};
-
-///////////////////////////////////////////////////////////////////////////////
-
-static void add_overdraw_code(GrGLSLFragmentBuilder* fragBuilder,
-                              const char* dstColor,
-                              const char* outputColor) {
-
-    fragBuilder->codeAppend("vec4 gTable[11] = vec4[11](");
-    fragBuilder->codeAppend("vec4(0,     0,     0,     0.0),");
-    fragBuilder->codeAppend("vec4(0.5,   0.617, 1.0,   1.0),");
-    fragBuilder->codeAppend("vec4(0.664, 0.723, 0.83,  1.0),");
-    fragBuilder->codeAppend("vec4(0.832, 0.762, 0.664, 1.0),");
-    fragBuilder->codeAppend("vec4(1,     0.75,  0.496, 1.0),");
-    fragBuilder->codeAppend("vec4(1,     0.723, 0.332, 1.0),");
-    fragBuilder->codeAppend("vec4(1,     0.645, 0.164, 1.0),");
-    fragBuilder->codeAppend("vec4(1,     0.527, 0,     1.0),");
-    fragBuilder->codeAppend("vec4(1,     0.371, 0,     1.0),");
-    fragBuilder->codeAppend("vec4(1,     0.195, 0,     1.0),");
-    fragBuilder->codeAppend("vec4(1,     0,     0,     1.0)");
-    fragBuilder->codeAppend(");");
-
-    fragBuilder->codeAppend("int nextIdx;");
-    fragBuilder->codeAppendf("vec4 dst = %s;", dstColor);
-    fragBuilder->codeAppend("if (dst.r < 0.25) { nextIdx = 1; }");
-    // cap 'idx' at 10
-    fragBuilder->codeAppend("else if (dst.g < 0.0977) { nextIdx = 10; }");
-    fragBuilder->codeAppend("else if (dst.b > 0.08) { nextIdx = 8 - int(6 * dst.b + 0.5); }");
-    fragBuilder->codeAppend("else { nextIdx = 11 - int(5.7 * dst.g + 0.5); }");
-    fragBuilder->codeAppendf("%s = gTable[nextIdx];", outputColor);
-}
-
-class GLOverdrawFP : public GrGLSLFragmentProcessor {
-public:
-    GLOverdrawFP(const GrOverdrawFP&) {}
-
-    ~GLOverdrawFP() override {}
-
-    void emitCode(EmitArgs& args) override {
-        GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
-        SkString dstColor("dstColor");
-        this->emitChild(0, nullptr, &dstColor, args);
-
-        add_overdraw_code(fragBuilder, dstColor.c_str(), args.fOutputColor);
-    }
-
-    static void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*) { }
-
-private:
-    typedef GrGLSLFragmentProcessor INHERITED;
-};
-
-///////////////////////////////////////////////////////////////////////////////
-
-GrGLSLFragmentProcessor* GrOverdrawFP::onCreateGLSLInstance() const {
-    return new GLOverdrawFP(*this);
-}
-
-void GrOverdrawFP::onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const {
-    GLOverdrawFP::GenKey(*this, caps, b);
-}
-
-const GrFragmentProcessor* GrOverdrawFP::TestCreate(GrProcessorTestData* d) {
-    SkAutoTUnref<const GrFragmentProcessor> dst(GrProcessorUnitTest::CreateChildFP(d));
-    return new GrOverdrawFP(dst);
-}
-
-GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrOverdrawFP);
-
-///////////////////////////////////////////////////////////////////////////////
-// Xfer Processor
-///////////////////////////////////////////////////////////////////////////////
-
-class OverdrawXP : public GrXferProcessor {
-public:
-    OverdrawXP(const DstTexture* dstTexture, bool hasMixedSamples)
-        : INHERITED(dstTexture, true, hasMixedSamples) {
-        this->initClassID<OverdrawXP>();
-    }
-
-    const char* name() const override { return "Overdraw"; }
-
-    GrGLSLXferProcessor* createGLSLInstance() const override;
-
-private:
-    GrXferProcessor::OptFlags onGetOptimizations(const GrPipelineOptimizations& optimizations,
-                                                 bool doesStencilWrite,
-                                                 GrColor* overrideColor,
-                                                 const GrCaps& caps) const override {
-        // We never look at the color input
-        return GrXferProcessor::kIgnoreColor_OptFlag;
-    }
-
-    void onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override;
-
-    bool onIsEqual(const GrXferProcessor&) const override { return true; }
-
-    typedef GrXferProcessor INHERITED;
-};
-
-///////////////////////////////////////////////////////////////////////////////
-
-class GLOverdrawXP : public GrGLSLXferProcessor {
-public:
-    GLOverdrawXP(const OverdrawXP&) { }
-
-    ~GLOverdrawXP() override {}
-
-    static void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*) { }
-
-private:
-    void emitBlendCodeForDstRead(GrGLSLXPFragmentBuilder* fragBuilder,
-                                 GrGLSLUniformHandler* uniformHandler,
-                                 const char* srcColor,
-                                 const char* srcCoverage,
-                                 const char* dstColor,
-                                 const char* outColor,
-                                 const char* outColorSecondary,
-                                 const GrXferProcessor& proc) override {
-        add_overdraw_code(fragBuilder, dstColor, outColor);
-
-        // Apply coverage.
-        INHERITED::DefaultCoverageModulation(fragBuilder, srcCoverage, dstColor, outColor,
-                                             outColorSecondary, proc);
-    }
-
-    void onSetData(const GrGLSLProgramDataManager&, const GrXferProcessor&) override { };
-
-    typedef GrGLSLXferProcessor INHERITED;
-};
-
-///////////////////////////////////////////////////////////////////////////////
-
-void OverdrawXP::onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const {
-    GLOverdrawXP::GenKey(*this, caps, b);
-}
-
-GrGLSLXferProcessor* OverdrawXP::createGLSLInstance() const { return new GLOverdrawXP(*this); }
-
-///////////////////////////////////////////////////////////////////////////////
-class GrOverdrawXPFactory : public GrXPFactory {
-public:
-    static GrXPFactory* Create() { return new GrOverdrawXPFactory(); }
-
-    void getInvariantBlendedColor(const GrProcOptInfo& colorPOI,
-                                  GrXPFactory::InvariantBlendedColor* blendedColor) const override {
-        blendedColor->fWillBlendWithDst = true;
-        blendedColor->fKnownColorFlags = kNone_GrColorComponentFlags;
-    }
-
-private:
-    GrOverdrawXPFactory() {
-        this->initClassID<GrOverdrawXPFactory>();
-    }
-
-    GrXferProcessor* onCreateXferProcessor(const GrCaps& caps,
-                                           const GrPipelineOptimizations& optimizations,
-                                           bool hasMixedSamples,
-                                           const DstTexture* dstTexture) const override {
-        return new OverdrawXP(dstTexture, hasMixedSamples);
-    }
-
-    bool willReadDstColor(const GrCaps& caps,
-                          const GrPipelineOptimizations& optimizations,
-                          bool hasMixedSamples) const override {
-        return true;
-    }
-
-    bool onIsEqual(const GrXPFactory& xpfBase) const override { return true; }
-
-    GR_DECLARE_XP_FACTORY_TEST;
-
-    typedef GrXPFactory INHERITED;
-};
-
-GR_DEFINE_XP_FACTORY_TEST(GrOverdrawXPFactory);
-
-const GrXPFactory* GrOverdrawXPFactory::TestCreate(GrProcessorTestData* d) {
-    return GrOverdrawXPFactory::Create();
-}
-#endif
-
-///////////////////////////////////////////////////////////////////////////////
-class SkOverdrawXfermode : public SkXfermode {
-public:
-    static SkXfermode* Create() {
-        return new SkOverdrawXfermode;
-    }
-
-    SkPMColor xferColor(SkPMColor src, SkPMColor dst) const override {
-        // This table encodes the color progression of the overdraw visualization
-        static const SkPMColor gTable[] = {
-            SkPackARGB32(0x00, 0x00, 0x00, 0x00),
-            SkPackARGB32(0xFF, 128, 158, 255),
-            SkPackARGB32(0xFF, 170, 185, 212),
-            SkPackARGB32(0xFF, 213, 195, 170),
-            SkPackARGB32(0xFF, 255, 192, 127),
-            SkPackARGB32(0xFF, 255, 185, 85),
-            SkPackARGB32(0xFF, 255, 165, 42),
-            SkPackARGB32(0xFF, 255, 135, 0),
-            SkPackARGB32(0xFF, 255,  95, 0),
-            SkPackARGB32(0xFF, 255,  50, 0),
-            SkPackARGB32(0xFF, 255,  0, 0)
-        };
-
-
-        int nextIdx;
-        if (SkColorGetR(dst) < 64) { // dst color is the 0th color so the next color is 1
-            nextIdx = 1;
-        } else if (SkColorGetG(dst) < 25) { // dst color is the 10th color so cap there
-            nextIdx = 10;
-        } else if ((SkColorGetB(dst)+21)/42 > 0) { // dst color is one of 1-6
-            nextIdx = 8 - (SkColorGetB(dst)+21)/42;
-        } else { // dst color is between 7 and 9
-            nextIdx = 11 - (SkColorGetG(dst)+22)/45;
-        }
-        SkASSERT(nextIdx < (int)SK_ARRAY_COUNT(gTable));
-
-        return gTable[nextIdx];
-    }
-
-    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkOverdrawXfermode)
-
-#if SK_SUPPORT_GPU
-    bool asFragmentProcessor(const GrFragmentProcessor** output,
-                             const GrFragmentProcessor* dst) const override {
-        if (output) {
-            *output = GrOverdrawFP::Create(dst);
-        }
-        return true;
-    }
-
-    bool asXPFactory(GrXPFactory** xpf) const override {
-        if (xpf) {
-            *xpf = GrOverdrawXPFactory::Create();
-        }
-        return true;
-    }
-#endif
-
-#ifndef SK_IGNORE_TO_STRING
-    void toString(SkString* str) const override { str->set("SkOverdrawXfermode"); }
-#endif
-
-private:
-    friend class SkOverdrawMode;
-
-    void flatten(SkWriteBuffer& buffer) const override { }
-
-    typedef SkXfermode INHERITED;
-};
-
-SkFlattenable* SkOverdrawXfermode::CreateProc(SkReadBuffer& buffer) {
-    return Create();
-}
-
-SkXfermode* SkOverdrawMode::Create() { return new SkOverdrawXfermode; }
-
-SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkOverdrawMode)
-    SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkOverdrawXfermode)
-SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END