the width of the block to convert, in pixels.
the height of the block to convert, in pixels.
an SDL_PixelFormat value of the src pixels format.
a pointer to the source pixels.
the pitch of the source pixels, in bytes.
an SDL_PixelFormat value of the dst pixels format.
a pointer to be filled in with premultiplied pixel data.
the pitch of the destination pixels, in bytes.
true to convert from sRGB to linear space for the alpha multiplication, false to do multiplication in sRGB space.
true on success or false on failure; call SDL_GetError() for more information.
Premultiply the alpha on a block of pixels.
This is safe to use with src == dst, but not for other overlapping areas.