SDL_SetSurfaceAlphaMod
Use this function to set an additional alpha value used in blit operations.
Contents
Syntax
int SDL_SetSurfaceAlphaMod(SDL_Surface* surface,
Uint8 alpha)
Function Parameters
surface |
the SDL_Surface structure to update |
alpha |
the source alpha value multiplied into blit operations |
Return Value
Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.
Code Examples
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Remarks
When a surface is blitted, during the blit operation the source alpha value is modulated by this alpha value according to the following formula:
srcA = srcA * alpha
