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Shows SDL_ISPIXELFORMAT_ALPHA value for two 24 bit pixel formats

BGR24.c (text/x-csrc), 1.51 KB, created by Lenard Lindstrom on 2015-05-06 00:09:24 UTC

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Description:

Filename:

MIME Type:

Creator: Lenard Lindstrom

Created: 2015-05-06 00:09:24 UTC

Size: 1.51 KB

patch

obsolete

>/* SDL2 2.0.2 bug; SDL_ISPIXELFORMAT_ALPHA returns 1 for SDL_BGR24
> * i86 Linux.
> *
> * To compile:
> *
> * gcc -I/usr/include/SDL2 BGR24.c -lSDL2 -o BGR24
> */
>
>#include "SDL.h"
>#include <stdio.h>
>
>typedef unsigned long ulong;
>
>const char *ENUM(Uint32 format)
>{
>    static char str[32];
>
>    switch (format) {
>
>    case SDL_PIXELFORMAT_RGB24:
>        return "SDL_PIXELFORMAT_RGB24";
>    case SDL_PIXELFORMAT_BGR24:
>        return "SDL_PIXELFORMAT_BGR24";
>    case SDL_PIXELFORMAT_UNKNOWN:
>        return "SDL_PIXELFORMAT_UNKNOWN";
>    }
>
>    snprintf(str, sizeof(str), "%lu", (ulong)format);
>    return str;
>}
>
>void alpha_test_24(Uint32 Rmask, Uint32 Gmask, Uint32 Bmask)
>{
>    SDL_Surface *s = SDL_CreateRGBSurface(0, 10, 12, 24,
>                                          Rmask, Gmask, Bmask, 0);
>
>    if (s) {
>        printf("%.31s (%lX, %lX, %lX): SDL_ISPIXELFORMAT_ALPHA = %d\n",
>               ENUM(s->format->format),
>               (ulong)Rmask, (ulong)Gmask, (ulong)Bmask,
>               (int)SDL_ISPIXELFORMAT_ALPHA(s->format->format));
>        SDL_FreeSurface(s);
>    }
>    else {
>        fprintf(stderr, "%.15s (%lX, %lX, %lX): %.256s\n",
>                ENUM(s->format->format),
>                (ulong)Rmask, (ulong)Gmask, (ulong)Bmask,
>                SDL_GetError());
>    }
>}
>
>int main(void)
>{
>    if (SDL_Init(SDL_INIT_VIDEO) != 0) {
>        fprintf(stderr, "%.256s\n", SDL_GetError());
>        return 1;
>    }
>    alpha_test_24(0xFFu, 0xFF00u, 0xFF0000u);
>    alpha_test_24(0xFF0000u, 0xFF00u, 0xFFu);
>    SDL_Quit();
>    return 0;
>}

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We are currently migrating Bugzilla to GitHub issues.Any changes made to the bug tracker now will be lost, so please do not post new bugs or make changes to them.When we're done, all bug URLs will redirect to their equivalent location on the new bug tracker.

We are currently migrating Bugzilla to GitHub issues.
Any changes made to the bug tracker now will be lost, so please do not post new bugs or make changes to them.
When we're done, all bug URLs will redirect to their equivalent location on the new bug tracker.