src/gpu/effects/generated/GrConfigConversionEffect.h

/*
 * Copyright 2018 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

/**************************************************************************************************
 *** This file was autogenerated from GrConfigConversionEffect.fp; do not modify.
 **************************************************************************************************/
#ifndef GrConfigConversionEffect_DEFINED
#define GrConfigConversionEffect_DEFINED

#include "include/core/SkM44.h"
#include "include/core/SkTypes.h"

#include "include/gpu/GrContext.h"
#include "src/gpu/GrBitmapTextureMaker.h"
#include "src/gpu/GrContextPriv.h"
#include "src/gpu/GrImageInfo.h"
#include "src/gpu/GrRenderTargetContext.h"

#include "src/gpu/GrCoordTransform.h"
#include "src/gpu/GrFragmentProcessor.h"

class GrConfigConversionEffect : public GrFragmentProcessor {
public:
    static bool TestForPreservingPMConversions(GrContext* context) {
        static constexpr int kSize = 256;
        static constexpr GrColorType kColorType = GrColorType::kRGBA_8888;
        SkAutoTMalloc<uint32_t> data(kSize * kSize * 3);
        uint32_t* srcData = data.get();
        uint32_t* firstRead = data.get() + kSize * kSize;
        uint32_t* secondRead = data.get() + 2 * kSize * kSize;

        // Fill with every possible premultiplied A, color channel value. There will be 256-y
        // duplicate values in row y. We set r, g, and b to the same value since they are handled
        // identically.
        for (int y = 0; y < kSize; ++y) {
            for (int x = 0; x < kSize; ++x) {
                uint8_t* color = reinterpret_cast<uint8_t*>(&srcData[kSize * y + x]);
                color[3] = y;
                color[2] = std::min(x, y);
                color[1] = std::min(x, y);
                color[0] = std::min(x, y);
            }
        }
        memset(firstRead, 0, kSize * kSize * sizeof(uint32_t));
        memset(secondRead, 0, kSize * kSize * sizeof(uint32_t));

        const SkImageInfo ii =
                SkImageInfo::Make(kSize, kSize, kRGBA_8888_SkColorType, kPremul_SkAlphaType);

        auto readRTC = GrRenderTargetContext::Make(context, kColorType, nullptr,
                                                   SkBackingFit::kExact, {kSize, kSize});
        auto tempRTC = GrRenderTargetContext::Make(context, kColorType, nullptr,
                                                   SkBackingFit::kExact, {kSize, kSize});
        if (!readRTC || !readRTC->asTextureProxy() || !tempRTC) {
            return false;
        }
        // Adding discard to appease vulkan validation warning about loading uninitialized data on
        // draw
        readRTC->discard();

        // This function is only ever called if we are in a GrContext that has a GrGpu since we are
        // calling read pixels here. Thus the pixel data will be uploaded immediately and we don't
        // need to keep the pixel data alive in the proxy. Therefore the ReleaseProc is nullptr.
        SkBitmap bitmap;
        bitmap.installPixels(ii, srcData, 4 * kSize);
        bitmap.setImmutable();

        GrBitmapTextureMaker maker(context, bitmap, GrImageTexGenPolicy::kNew_Uncached_Budgeted);
        auto dataView = maker.view(GrMipMapped::kNo);
        if (!dataView) {
            return false;
        }

        static const SkRect kRect = SkRect::MakeIWH(kSize, kSize);

        // We do a PM->UPM draw from dataTex to readTex and read the data. Then we do a UPM->PM draw
        // from readTex to tempTex followed by a PM->UPM draw to readTex and finally read the data.
        // We then verify that two reads produced the same values.

        GrPaint paint1;
        GrPaint paint2;
        GrPaint paint3;
        std::unique_ptr<GrFragmentProcessor> pmToUPM(
                new GrConfigConversionEffect(PMConversion::kToUnpremul));
        std::unique_ptr<GrFragmentProcessor> upmToPM(
                new GrConfigConversionEffect(PMConversion::kToPremul));

        paint1.addColorFragmentProcessor(
                GrTextureEffect::Make(std::move(dataView), kPremul_SkAlphaType));
        paint1.addColorFragmentProcessor(pmToUPM->clone());
        paint1.setPorterDuffXPFactory(SkBlendMode::kSrc);

        readRTC->fillRectToRect(nullptr, std::move(paint1), GrAA::kNo, SkMatrix::I(), kRect, kRect);
        if (!readRTC->readPixels(ii, firstRead, 0, {0, 0})) {
            return false;
        }

        // Adding discard to appease vulkan validation warning about loading uninitialized data on
        // draw
        tempRTC->discard();

        paint2.addColorFragmentProcessor(
                GrTextureEffect::Make(readRTC->readSurfaceView(), kUnpremul_SkAlphaType));
        paint2.addColorFragmentProcessor(std::move(upmToPM));
        paint2.setPorterDuffXPFactory(SkBlendMode::kSrc);

        tempRTC->fillRectToRect(nullptr, std::move(paint2), GrAA::kNo, SkMatrix::I(), kRect, kRect);

        paint3.addColorFragmentProcessor(
                GrTextureEffect::Make(tempRTC->readSurfaceView(), kPremul_SkAlphaType));
        paint3.addColorFragmentProcessor(std::move(pmToUPM));
        paint3.setPorterDuffXPFactory(SkBlendMode::kSrc);

        readRTC->fillRectToRect(nullptr, std::move(paint3), GrAA::kNo, SkMatrix::I(), kRect, kRect);

        if (!readRTC->readPixels(ii, secondRead, 0, {0, 0})) {
            return false;
        }

        for (int y = 0; y < kSize; ++y) {
            for (int x = 0; x <= y; ++x) {
                if (firstRead[kSize * y + x] != secondRead[kSize * y + x]) {
                    return false;
                }
            }
        }

        return true;
    }

    static std::unique_ptr<GrFragmentProcessor> Make(std::unique_ptr<GrFragmentProcessor> fp,
                                                     PMConversion pmConversion) {
        if (!fp) {
            return nullptr;
        }
        std::unique_ptr<GrFragmentProcessor> ccFP(new GrConfigConversionEffect(pmConversion));
        std::unique_ptr<GrFragmentProcessor> fpPipeline[] = {std::move(fp), std::move(ccFP)};
        return GrFragmentProcessor::RunInSeries(fpPipeline, 2);
    }
    GrConfigConversionEffect(const GrConfigConversionEffect& src);
    std::unique_ptr<GrFragmentProcessor> clone() const override;
    const char* name() const override { return "ConfigConversionEffect"; }
    PMConversion pmConversion;

private:
    GrConfigConversionEffect(PMConversion pmConversion)
            : INHERITED(kGrConfigConversionEffect_ClassID, kNone_OptimizationFlags)
            , pmConversion(pmConversion) {}
    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
    void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override;
    bool onIsEqual(const GrFragmentProcessor&) const override;
    GR_DECLARE_FRAGMENT_PROCESSOR_TEST
    typedef GrFragmentProcessor INHERITED;
};
#endif