SDL_ISPIXELFORMAT_ALPHA - Man Page

#include <SDL3/SDL_pixels.h>

#define SDL_ISPIXELFORMAT_ALPHA(format)   \
    ((SDL_ISPIXELFORMAT_PACKED(format) && \
      ((SDL_PIXELORDER(format) == SDL_PACKEDORDER_ARGB) || \
       (SDL_PIXELORDER(format) == SDL_PACKEDORDER_RGBA) || \
       (SDL_PIXELORDER(format) == SDL_PACKEDORDER_ABGR) || \
       (SDL_PIXELORDER(format) == SDL_PACKEDORDER_BGRA))) || \
     (SDL_ISPIXELFORMAT_ARRAY(format) && \
      ((SDL_PIXELORDER(format) == SDL_ARRAYORDER_ARGB) || \
       (SDL_PIXELORDER(format) == SDL_ARRAYORDER_RGBA) || \
       (SDL_PIXELORDER(format) == SDL_ARRAYORDER_ABGR) || \
       (SDL_PIXELORDER(format) == SDL_ARRAYORDER_BGRA))))

Note that this macro double-evaluates its parameter, so do not use expressions with side-effects here.

format

an SDL_PixelFormat to check.

Returns true if the format has alpha, false otherwise.

It is safe to call this macro from any thread.

This macro is available since SDL 3.2.0.