C++ (Cpp) SkBitmap::erase Examples

Example #1

File: Bitmap_allocPixels_4.cpp Project: HalCanary/skia-hc

void draw(SkCanvas* canvas) {
   TinyAllocator tinyAllocator;
   SkBitmap bitmap;
   bitmap.setInfo(SkImageInfo::MakeN32(2, 2, kOpaque_SkAlphaType));
   if (bitmap.tryAllocPixels(&tinyAllocator)) {
       bitmap.eraseColor(0xff55aa33);
       bitmap.erase(0xffaa3355, SkIRect::MakeXYWH(1, 1, 1, 1));
       canvas->scale(16, 16);
       canvas->drawBitmap(bitmap, 0, 0);
   }
}

Example #2

File: Bitmap_allocN32Pixels.cpp Project: HalCanary/skia-hc

void draw(SkCanvas* canvas) {
    SkRandom random;
    SkBitmap bitmap;
    bitmap.allocN32Pixels(64, 64);
    bitmap.eraseColor(SK_ColorTRANSPARENT);
    for (int y = 0; y < 256; y += 64) {
        for (int x = 0; x < 256; x += 64) {
            SkColor color = random.nextU();
            uint32_t w = random.nextRangeU(4, 32);
            uint32_t cx = random.nextRangeU(0, 64 - w);
            uint32_t h = random.nextRangeU(4, 32);
            uint32_t cy = random.nextRangeU(0, 64 - h);
            bitmap.erase(color, SkIRect::MakeXYWH(cx, cy, w, h));
            canvas->drawBitmap(bitmap, x, y);
        }
    }
}