SDL_ISPIXELFORMAT_ALPHA - Man Page

SDL_ISPIXELFORMAT_ALPHA — A macro to determine if an SDL_PixelFormat
has an alpha channel.

Defined in SDL3/SDL_pixels.h

#include "SDL3/SDL.h"

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

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

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.