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) {
  // Turn `image` into an SkShader:
  sk_sp<SkShader> imageShader = image->makeShader(SkSamplingOptions(SkFilterMode::kLinear));
​
  const char* sksl =
    "uniform shader image;"
    "half4 main(float2 coord) {"
    "  return image.eval(coord).bgra;"  // Sample 'image', then swap red and blue
    "}";
​
  // Parse the SkSL, and create an SkRuntimeEffect object:
  auto [effect, err] = SkRuntimeEffect::MakeForShader(SkString(sksl));
​
  // SkRuntimeEffect::makeShader expects an SkSpan<ChildPtr>, one per `uniform shader`:
  SkRuntimeEffect::ChildPtr children[] = { imageShader };
​
  // Create an SkShader from our SkSL, with `imageShader` bound to `image`:
  sk_sp<SkShader> myShader = effect->makeShader(/*uniforms=*/ nullptr,
                                                /*children=*/ { children, 1 });
​
  // Fill the surface with `myShader`:
  SkPaint p;
  p.setShader(myShader);
  canvas->drawPaint(p);
}