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:

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void draw(SkCanvas* canvas) {
    std::vector<int32_t> srcPixels;
    int quarterWidth = image->width() / 16;
    int rowBytes = quarterWidth * 4;
    int quarterHeight = image->height() / 16;
    srcPixels.resize(quarterHeight * rowBytes);
    SkPixmap pixmap(SkImageInfo::MakeN32Premul(quarterWidth, quarterHeight),
                    &srcPixels.front(), rowBytes);
    canvas->scale(4, 4);
​
    const SkSamplingOptions samplings[] = {
        SkSamplingOptions(),
        SkSamplingOptions(SkFilterMode::kLinear),
        SkSamplingOptions(SkFilterMode::kLinear, SkMipmapMode::kLinear),
        SkSamplingOptions({1.0f/3, 1.0f/3}),
    };
    for (unsigned index = 0; index < std::size(samplings); ++index) {
        image->scalePixels(pixmap, samplings[index]);
        sk_sp<SkImage> filtered = SkImages::RasterFromPixmap(pixmap, nullptr, nullptr);
        canvas->drawImage(filtered, 16 * index, 0);
    }
}