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SDL_PremultiplyAlpha

Premultiply the alpha on a block of pixels.

Syntax

int SDL_PremultiplyAlpha(int width, int height,
                         Uint32 src_format,
                         const void * src, int src_pitch,
                         Uint32 dst_format,
                         void * dst, int dst_pitch);

Function 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_PixelFormatEnum 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_PixelFormatEnum 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

Return Value

Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.

Remarks

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

This function is currently only implemented for SDL_PIXELFORMAT_ARGB8888.

Version

This function is available since SDL 2.0.18.


CategoryAPI


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