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 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
You can add your code example here
Remarks
When this 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 / 255)
