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SDL_SetSurfaceAlphaMod

Use this function to 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.

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)


CategoryAPI, CategorySurface

None: SDL_SetSurfaceAlphaMod (last edited 2011-01-07 19:05:50 by SheenaSmith)

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