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Enhancements for SDL_PremultiplyAlpha()

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The function can now convert between pixels of different formats, and takes a parameter to control whether the premultiplication is done in sRGB or linear space.

Also added SDL_PremultiplySurfaceAlpha(), which can premultiply the pixels of a surface in-place.
This commit is contained in:
Sam Lantinga 2024-07-17 12:50:56 -07:00
parent b99ea1ff75
commit 334962b056
7 changed files with 210 additions and 31 deletions
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3
src/dynapi/SDL_dynapi_procs.h
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@ -645,7 +645,8 @@ SDL_DYNAPI_PROC(SDL_bool,SDL_PenConnected,(SDL_PenID a),(a),return)
SDL_DYNAPI_PROC(int,SDL_PlayHapticRumble,(SDL_Haptic *a, float b, Uint32 c),(a,b,c),return)
SDL_DYNAPI_PROC(SDL_bool,SDL_PollEvent,(SDL_Event *a),(a),return)
SDL_DYNAPI_PROC(int,SDL_PostSemaphore,(SDL_Semaphore *a),(a),return)
SDL_DYNAPI_PROC(int,SDL_PremultiplyAlpha,(int a, int b, SDL_PixelFormat c, const void *d, int e, SDL_PixelFormat f, void *g, int h),(a,b,c,d,e,f,g,h),return)
SDL_DYNAPI_PROC(int,SDL_PremultiplyAlpha,(int a, int b, SDL_PixelFormat c, const void *d, int e, SDL_PixelFormat f, void *g, int h, SDL_bool i),(a,b,c,d,e,f,g,h,i),return)
SDL_DYNAPI_PROC(int,SDL_PremultiplySurfaceAlpha,(SDL_Surface *a, SDL_bool b),(a,b),return)
SDL_DYNAPI_PROC(void,SDL_PumpEvents,(void),(),)
SDL_DYNAPI_PROC(int,SDL_PushEvent,(SDL_Event *a),(a),return)
SDL_DYNAPI_PROC(int,SDL_PutAudioStreamData,(SDL_AudioStream *a, const void *b, int c),(a,b,c),return)