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Skia Fiddle
Skia Version:
bd99c0
// purplestamp // Whether to use a separate bitmap (with a color type) at all. bool drawWithRasterImage = true; // This works with either kN32_SkColorType or kAlpha_8_SkColorType. // Applies only if drawWithRasterImage is true. SkColorType colorType = kN32_SkColorType; void drawStamp(SkCanvas* canvas, int size) { canvas->save(); canvas->clipRect(SkRect::MakeWH(size, size), SkClipOp::kIntersect, true); canvas->clear(0x3F000000 /* translucent black */); SkPaint paint; paint.setAntiAlias(true); paint.setColor(SK_ColorBLACK); canvas->drawRRect( SkRRect::MakeOval(SkRect::MakeXYWH(size/4, size/4, size/2, size/2)), paint); paint.setStyle(SkPaint::kStroke_Style); paint.setStrokeWidth(20); canvas->drawRect(SkRect::MakeWH(size, size), paint); canvas->restore(); } sk_sp<SkImage> stampImage(int size) { sk_sp<SkSurface> surface = SkSurface::MakeRaster( SkImageInfo::Make(size, size, colorType, kPremul_SkAlphaType)); drawStamp(surface->getCanvas(), size); return surface->makeImageSnapshot(); } void draw(SkCanvas* canvas) { SkPaint paint; paint.setColorFilter(SkColorFilters::Blend(0xFF7F00FF, SkBlendMode::kSrcIn)); paint.setFilterQuality(kMedium_SkFilterQuality); paint.setAntiAlias(true); canvas->rotate(30); canvas->translate(60, 0); int stampSize = 200; if (drawWithRasterImage) { canvas->drawImage(stampImage(stampSize), 0, 0, &paint); } else { canvas->saveLayer(nullptr, &paint); drawStamp(canvas, stampSize); canvas->restore(); } }
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