gm/makecolorspace.cpp

/*
 * Copyright 2017 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "gm.h"
#include "Resources.h"
#include "SkCodec.h"
#include "SkColorSpace.h"
#include "SkImage.h"
#include "SkImagePriv.h"

sk_sp<SkImage> make_raster_image(const char* path) {
    sk_sp<SkData> resourceData = GetResourceAsData(path);
    std::unique_ptr<SkCodec> codec = SkCodec::MakeFromData(resourceData);

    SkBitmap bitmap;
    bitmap.allocPixels(codec->getInfo());

    codec->getPixels(codec->getInfo(), bitmap.getPixels(), bitmap.rowBytes());
    return SkImage::MakeFromBitmap(bitmap);
}

sk_sp<SkImage> make_color_space(sk_sp<SkImage> orig, sk_sp<SkColorSpace> colorSpace) {
    sk_sp<SkImage> xform = orig->makeColorSpace(colorSpace);

    // Assign an sRGB color space on the xformed image, so we can see the effects of the xform
    // when we draw.
    sk_sp<SkColorSpace> srgb = SkColorSpace::MakeSRGB();
    if (colorSpace->gammaIsLinear()) {
        srgb = SkColorSpace::MakeSRGBLinear();
    }
    return SkImageMakeRasterCopyAndAssignColorSpace(xform.get(), srgb.get());
}

class MakeCSGM : public skiagm::GM {
public:
    MakeCSGM() {}

protected:
    SkString onShortName() override {
        return SkString("makecolorspace");
    }

    SkISize onISize() override {
        return SkISize::Make(128*3, 128*4);
    }

    void onDraw(SkCanvas* canvas) override {
        sk_sp<SkColorSpace> wideGamut = SkColorSpace::MakeRGB(SkNamedTransferFn::kSRGB,
                                                              SkNamedGamut::kAdobeRGB);
        sk_sp<SkColorSpace> wideGamutLinear = wideGamut->makeLinearGamma();

        // Lazy images
        sk_sp<SkImage> opaqueImage = GetResourceAsImage("images/mandrill_128.png");
        sk_sp<SkImage> premulImage = GetResourceAsImage("images/color_wheel.png");
        if (!opaqueImage || !premulImage) {
            return;
        }
        canvas->drawImage(opaqueImage, 0.0f, 0.0f);
        canvas->drawImage(make_color_space(opaqueImage, wideGamut), 128.0f, 0.0f);
        canvas->drawImage(make_color_space(opaqueImage, wideGamutLinear), 256.0f, 0.0f);
        canvas->drawImage(premulImage, 0.0f, 128.0f);
        canvas->drawImage(make_color_space(premulImage, wideGamut), 128.0f, 128.0f);
        canvas->drawImage(make_color_space(premulImage, wideGamutLinear), 256.0f, 128.0f);
        canvas->translate(0.0f, 256.0f);

        // Raster images
        opaqueImage = make_raster_image("images/mandrill_128.png");
        premulImage = make_raster_image("images/color_wheel.png");
        canvas->drawImage(opaqueImage, 0.0f, 0.0f);
        canvas->drawImage(make_color_space(opaqueImage, wideGamut), 128.0f, 0.0f);
        canvas->drawImage(make_color_space(opaqueImage, wideGamutLinear), 256.0f, 0.0f);
        canvas->drawImage(premulImage, 0.0f, 128.0f);
        canvas->drawImage(make_color_space(premulImage, wideGamut), 128.0f, 128.0f);
        canvas->drawImage(make_color_space(premulImage, wideGamutLinear), 256.0f, 128.0f);
    }

private:
    typedef skiagm::GM INHERITED;
};

DEF_GM(return new MakeCSGM;)

DEF_SIMPLE_GM_BG(makecolortypeandspace, canvas, 128 * 3, 128 * 4, SK_ColorWHITE) {
    sk_sp<SkImage> images[] = {
        GetResourceAsImage("images/mandrill_128.png"),
        GetResourceAsImage("images/color_wheel.png"),
    };
    auto rec2020 = SkColorSpace::MakeRGB(SkNamedTransferFn::kSRGB, SkNamedGamut::kRec2020);

    // Use the lazy images on the first iteration, and concrete (raster/GPU) images on the second
    for (int i = 0; i < 2; ++i) {
        for (int j = 0; j < 2; ++j) {
            // Unmodified
            canvas->drawImage(images[j], 0, 0);

            // 565 in a wide color space (should be visibly quantized).
            // With the lazy color_wheel image, this fails to draw, because we refuse to decode
            // transparent sources to opaque color types. Sigh.
            canvas->drawImage(images[j]->makeColorTypeAndColorSpace(kRGB_565_SkColorType, rec2020),
                              128, 0);

            // Grayscale in the original color space. This fails in even more cases, due to the
            // above opaque issue, and because Ganesh doesn't support drawing to gray, at all.
            canvas->drawImage(images[j]->makeColorTypeAndColorSpace(kGray_8_SkColorType,
                                                                    images[j]->refColorSpace()),
                              256, 0);

            images[j] = canvas->getGrContext()
                    ? images[j]->makeTextureImage(canvas->getGrContext(), nullptr)
                    : images[j]->makeRasterImage();

            canvas->translate(0, 128);
        }
    }
}