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Blit a 24-bit surface to a 32-bit target surface using SDL_UpperBlit

Blit24.c (text/x-csrc), 2.54 KB, created by Lenard Lindstrom on 2015-06-29 19:14:06 UTC

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Description:

Filename:

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Creator: Lenard Lindstrom

Created: 2015-06-29 19:14:06 UTC

Size: 2.54 KB

patch

obsolete

>/* SDL2 2.0.2 bug; SDL_UpperBlit swaps Red and Blue componensts for a
> * 24-bit to 32-bit surface blit.
> *
> * The source surface is the default 24-bit format (BGR888 for test system).
> * The target surface has no per-pixel alpha.
> * See Bug 2986: SDL_FillRect onto a 24-bit surface swaps Red and Blue
> *               component.
> *
> * Test system: i386 Linux.
> *
> * To compile:
> *
> * gcc -I/usr/include/SDL2 Blit24.c -lSDL2 -o Blit24
> */
>
>#include "SDL.h"
>#include <stdio.h>
>
>int main(void)
>{
>    SDL_Surface *source;
>    SDL_Surface *target;
>    Uint32 color;
>    const Uint8 SOURCE_R = 100, SOURCE_G = 45, SOURCE_B = 0;
>    const Uint8 TARGET_R = 0, TARGET_G = 90, TARGET_B = 200;
>    Uint8 R = 10, G = 10, B = 10;
>
>    if (SDL_Init(SDL_INIT_VIDEO) != 0) {
>        fprintf(stderr, "%.256s\n", SDL_GetError());
>        SDL_Quit();
>        return 1;
>    }
>    source = SDL_CreateRGBSurface(0, 10, 10, 24, 0, 0, 0, 0);
>    if (source == NULL) {
>        fprintf(stderr, "source: %.256s\n", SDL_GetError());
>        SDL_Quit();
>        return 1;
>    }
>    printf("source format: %.80s\n",
>           SDL_GetPixelFormatName(source->format->format));
>    target = SDL_CreateRGBSurface(0, 10, 10, 32, 0, 0, 0, 0);
>    if (target == NULL) {
>        fprintf(stderr, "target: %.256s\n", SDL_GetError());
>        SDL_Quit();
>        return 1;
>    }
>    printf("target format: %.80s\n",
>           SDL_GetPixelFormatName(target->format->format));
>    color = SDL_MapRGB(source->format, SOURCE_R, SOURCE_G, SOURCE_B);
>    if (SDL_FillRect(source, NULL, color) != 0) {
>        fprintf(stderr, "source fill: %.256s\n", SDL_GetError());
>        SDL_Quit();
>        return 1;
>    }
>    color = SDL_MapRGB(target->format, TARGET_R, TARGET_G, TARGET_B);
>    if (SDL_FillRect(target, NULL, color) != 0) {
>        fprintf(stderr, "target fill: %.256s\n", SDL_GetError());
>        SDL_Quit();
>        return 1;
>    }
>    color = ((Uint32 *)target->pixels)[0];
>    SDL_GetRGB(color, target->format, &R, &G, &B);
>    printf("Target color before blit: (%d, %d, %d) -- should be (%d, %d, %d)\n",
>           (int)R, (int)G, (int)B, (int)TARGET_R, (int)TARGET_G, (int)TARGET_B);
>    if (SDL_UpperBlit(source, NULL, target, NULL) != 0) {
>        fprintf(stderr, "blit: %.256s\n", SDL_GetError());
>        SDL_Quit();
>        return 1;
>    }
>    color = ((Uint32 *)target->pixels)[0];
>    SDL_GetRGB(color, target->format, &R, &G, &B);
>    printf("Target color after blit: (%d, %d, %d) -- should be (%d, %d, %d)\n",
>           (int)R, (int)G, (int)B, (int)SOURCE_R, (int)SOURCE_G, (int)SOURCE_B);
>    SDL_Quit();
>    return 0;
>}

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Attachments on bug 3045: 2206

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.