Function SDL_PremultiplyAlpha

pub unsafe extern "C" fn SDL_PremultiplyAlpha(
    width: i32,
    height: i32,
    src_format: SDL_PixelFormat,
    src: *const c_void,
    src_pitch: i32,
    dst_format: SDL_PixelFormat,
    dst: *mut c_void,
    dst_pitch: i32,
    linear: bool,
) -> bool

Available on crate feature dep_sdl3 only.

Premultiply the alpha on a block of pixels.

This is safe to use with src == dst, but not for other overlapping areas.

Parameters

• width: the width of the block to convert, in pixels.
• height: the height of the block to convert, in pixels.
• src_format: an SDL_PixelFormat value of the src pixels format.
• src: a pointer to the source pixels.
• src_pitch: the pitch of the source pixels, in bytes.
• dst_format: an SDL_PixelFormat value of the dst pixels format.
• dst: a pointer to be filled in with premultiplied pixel data.
• dst_pitch: the pitch of the destination pixels, in bytes.
• linear: true to convert from sRGB to linear space for the alpha multiplication, false to do multiplication in sRGB space.

Return value

Returns true on success or false on failure; call SDL_GetError() for more information.

Availability

This function is available since SDL 3.2.0.