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Skia Version:
ba094e
void draw(SkCanvas* canvas) { std::vector<int32_t> srcPixels; int rowBytes = image->width() * 4; int quarterWidth = image->width() / 4; int quarterHeight = image->height() / 4; srcPixels.resize(image->height() * rowBytes); for (int y = 0; y < 4; ++y) { for (int x = 0; x < 4; ++x) { SkPixmap pixmap(SkImageInfo::MakeN32Premul(quarterWidth, quarterHeight), &srcPixels.front() + x * image->height() * quarterWidth + y * quarterWidth, rowBytes); image->readPixels(pixmap, x * quarterWidth, y * quarterHeight); } } canvas->scale(.5f, .5f); SkBitmap bitmap; bitmap.installPixels(SkImageInfo::MakeN32Premul(image->width(), image->height()), &srcPixels.front(), rowBytes); canvas->drawBitmap(bitmap, 0, 0); }
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