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Fixed bug 2924 - SDL_CreateRGBSurface[From] versions that take SDL_PIXELFORMAT enum

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Daniel Gibson

Currently, SDL_CreateRGBSurface() and SDL_CreateRGBSurfaceFrom() take Uint32 masks for RGBA to "describe" the Pixelformat of the surface.
Internally those value are only used to map to one of the SDL_PIXELFORMAT_* enum values that are used for further processing.

I think it would be both handy and more efficient to be able to specify SDL_PIXELFORMAT_* yourself without using SDL_PixelFormatEnumToMasks() to create masks first, so I implemented functions that do that:
SDL_CreateRGBSurfaceWithFormat() and SDL_CreateRGBSurfaceWithFormatFrom() which are like the versions without "WithFormat" but instead of taking 4 Uint32s for R/G/B/A masks, they take one for a SDL_PIXELFORMAT_* enum value.

Together with https://bugzilla.libsdl.org/show_bug.cgi?id=2923 creating a SDL_Surface* from RGBA data (e.g. from stb_image)  is as easy as
  surf = SDL_SDL_CreateRGBSurfaceWithFormat(0, w, h, bppToUse*8, SDL_PIXELFORMAT_RGBA32);
This commit is contained in:
Sam Lantinga 2016-10-07 17:04:58 -07:00
parent 73f2c5413d
commit d2676c2985
4 changed files with 60 additions and 15 deletions
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2
src/dynapi/SDL_dynapi_procs.h
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@ -641,3 +641,5 @@ SDL_DYNAPI_PROC(int,SDL_RenderSetIntegerScale,(SDL_Renderer *a, SDL_bool b),(a,b
SDL_DYNAPI_PROC(SDL_bool,SDL_RenderGetIntegerScale,(SDL_Renderer *a),(a),return)
SDL_DYNAPI_PROC(Uint32,SDL_DequeueAudio,(SDL_AudioDeviceID a, void *b, Uint32 c),(a,b,c),return)
SDL_DYNAPI_PROC(void,SDL_SetWindowResizable,(SDL_Window *a, SDL_bool b),(a,b),)
SDL_DYNAPI_PROC(SDL_Surface*,SDL_CreateRGBSurfaceWithFormat,(Uint32 a, int b, int c, int d, Uint32 e),(a,b,c,d,e),return)
SDL_DYNAPI_PROC(SDL_Surface*,SDL_CreateRGBSurfaceWithFormatFrom,(void *a, int b, int c, int d, int e, Uint32 f),(a,b,c,d,e,f),return)