An immutable, thread-safe source image for platform-neutral draw commands.
Pixels are row-major straight, non-premultiplied 0xAARRGGBB values. Implementations own their storage and expose neither a mutable array nor a public construction surface.
0xAARRGGBB
The image extent in source pixel coordinates.
Reads one source pixel without changing the image.
Returns a fresh row-major copy of every source pixel.