DRAFT |
SDL_SetSurfaceBlendMode
Use this function to set the blend mode used for blit operations.
Contents
Syntax
int SDL_SetSurfaceBlendMode(SDL_Surface* surface,
SDL_BlendMode blendMode)
Function Parameters
surface |
the SDL_Surface structure to update |
blendMode |
the SDL_BlendMode enumeration value to use for blit blending; see Remarks for details |
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
blendMode may be SDL_BLENDMODE_NONE or a mask of any of the other SDL_BlendMode values OR'd together:
SDL_BLENDMODE_NONE |
no blending |
|
dstRGBA = srcRGBA |
SDL_BLENDMODE_BLEND |
alpha blending |
|
dstRGB = (srcRGB * srcA) + (dstRGB * (1-srcA)) |
|
dstA = srcA + (dstA * (1-srcA)) |
SDL_BLENDMODE_ADD |
additive blending |
|
dstRGB = (srcRGB * srcA) + dstRGB |
|
dstA = dstA |
SDL_BLENDMODE_MOD |
color modulate |
|
dstRGB = srcRGB * dstRGB |
|
dstA = dstA |
