@ kColorBurn
darken destination to reflect source
static constexpr SkColor SkColorSetARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b)
static void draw(SkCanvas *canvas, SkRect &target, int x, int y)
void clipRect(const SkRect &rect, SkClipOp op, bool doAntiAlias)
void drawColor(SkColor color, SkBlendMode mode=SkBlendMode::kSrcOver)
void drawImage(const SkImage *image, SkScalar left, SkScalar top)
#define REG_FIDDLE(NAME, W, H, TEXT, I)