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.
These blocks will be folded by default and are useful for highlighting specific lines of code.
You can also use the keyboard shortcuts Ctrl+S and Ctrl+E in the code editor to set them.

xxxxxxxxxx
 
void draw(SkCanvas* canvas) {
    canvas->drawColor(SK_ColorWHITE);
    const int N = 8;
    int shuffle[N * N];
    for (int i = 0; i < (N * N); ++i) {
        shuffle[i] = i;
    }
    srand(0);
    for (int i = 0; i < (N * N); ++i) {
        std::swap(shuffle[i], shuffle[rand() % (N * N - i) + i]);
    }
    int w = (source.width() - 1) / N + 1;
    int h = (source.height() - 1) / N + 1;
    for (int i = 0; i < N; ++i) {
        for (int j = 0; j < N; ++j) {
            int x = shuffle[(N * i) + j] % N;
            int y = shuffle[(N * i) + j] / N;
            SkBitmap subset;
            source.extractSubset(&subset, SkIRect::MakeXYWH(w * x, h * y, w, h));
            canvas->drawImage(subset.asImage(), w * i, h * j);
        }
    }
}