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Skia Fiddle
Skia Version:
c70966
void draw(SkCanvas* canvas) { canvas->drawImage(image, 0, 0); canvas->drawImage(image, 128, 0); canvas->drawImage(image, 0, 128); canvas->drawImage(image, 128, 128); SkPaint paint; paint.setBlendMode(SkBlendMode::kDstATop); SkColor alphas[] = { SK_ColorBLACK, SK_ColorTRANSPARENT }; SkPoint vert[] = { { 0, 0 }, { 0, 256 } }; paint.setShader(SkGradientShader::MakeLinear(vert, alphas, nullptr, SK_ARRAY_COUNT(alphas), SkTileMode::kClamp)); canvas->drawPaint(paint); canvas->clipRect( { 30, 30, 226, 226 } ); canvas->drawColor(0x80bb9977, SkBlendMode::kDifference); }
Skia API Documentation