This is new wiki software and old wiki content. It's a work in progress!
Here's the explanation.
Be gentle, report bugs, leave feedback on pages, or just edit them yourself! Thanks!

SDL Wiki

SDL_SetSurfaceAlphaMod

Set an additional alpha value used in blit operations.

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.

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)

SDL_GetSurfaceAlphaMod
SDL_SetSurfaceColorMod

CategoryAPI, CategorySurface


[ edit | delete | history | feedback | raw ]

[ front page | index | search | recent changes | git repo | offline html ]

All wiki content is licensed under Creative Commons Attribution 4.0 International (CC BY 4.0).
Wiki powered by ghwikipp.