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Skia Fiddle
Skia Version:
db80cb
sk_sp<SkImage> alpha_image() { auto s = SkSurface::MakeRaster(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, (SkShader::TileMode)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 SkColorFilter::MakeMatrixFilterRowMajor255(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, &p); }
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