Skia Fiddle

Options

Width Height

check_box_outline_blank check_box Text Only [Use SkDebugf()]

check_box_outline_blank check_box sRGB

check_box_outline_blank check_box F16

check_box_outline_blank check_box Animation

check_box_outline_blank check_box Offscreen Render Target

Width Height Sample Count

check_box_outline_blank check_box Texturable

check_box_outline_blank check_box MipMap

This global is now defined:

GrBackendRenderTarget backEndRenderTarget;

GrBackendTexture backEndTextureRenderTarget;

Optional source image

check_box_outline_blank check_box MipMap

These globals are now defined:

SkBitmap source;
sk_sp<SkImage> image;
GrBackendTexture backEndTexture; // GPU Only.

Note:

Adding comments with SK_FOLD_START and SK_FOLD_END creates foldable code blocks.
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sk_sp<SkImage> alpha_image() {
    auto s = SkSurfaces::Raster(SkImageInfo::MakeA8(64, 64));
    s->getCanvas()->clear(SkColorSetARGB(0x80, 0x00, 0x00, 0x00));
    return s->makeImageSnapshot();
}
sk_sp<SkShader> linear_gradient() {
    SkPoint gpts[2] = {{0, 0}, {64, 64}};
    SkColor gc[3] = {SK_ColorRED, SK_ColorGREEN, SK_ColorMAGENTA};
    return SkGradientShader::MakeLinear(gpts, gc, nullptr, 3, (SkTileMode)0);
}
sk_sp<SkColorFilter> color_filter() {
    SkScalar colorMatrix[20] = {
        1, 0, 0, 0, 0,
        0, 0, 1, 0, 0,
        0, 1, 0, 0, 0,
        0, 0, 0, 1, 0};
    return SkColorFilters::Matrix(colorMatrix);
}
void draw(SkCanvas* canvas) {
    SkPaint p;
    p.setShader(linear_gradient());
    p.setColorFilter(color_filter());
    auto i = alpha_image();
    canvas->scale(2, 2);
    canvas->drawImage(i.get(), 32, 32, SkSamplingOptions(), &p);
}