Linearly blends a new pixel with an existing color value in a canvas. Compared to putPixel32, this function supports sub-pixel placement, but is dramatically slower.
putPixel32
The canvas to interact with.
The X coordinate at which to place the pixel.
The Y coordinate at which to place the pixel.
The color of the pixel.
The alpha value to use to blend the pixel with existing color at the location.
Linearly blends a new pixel with an existing color value in a canvas. Compared to
putPixel32, this function supports sub-pixel placement, but is dramatically slower.