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corrupt SDL_RenderCopyEx example code

main.cpp (text/plain), 3.29 KB, created by duckgrease on 2018-06-07 01:30:11 UTC

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Description:

Filename:

MIME Type:

Creator: duckgrease

Created: 2018-06-07 01:30:11 UTC

Size: 3.29 KB

patch

obsolete

>#include "SDL.h"
>
>SDL_Window *window;
>SDL_Renderer *renderer;
>SDL_Texture *texture;
>int done;
>
>void
>DrawChessBoard(SDL_Renderer * renderer)
>{
>    int row = 0,column = 0,x = 0;
>    SDL_Rect rect, darea;
>
>    /* Get the Size of drawing surface */
>    SDL_RenderGetViewport(renderer, &darea);
>
>    for ( ; row < 8; row++) {
>        column = row%2;
>        x = column;
>        for ( ; column < 4+(row%2); column++) {
>            SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0xFF);
>
>            rect.w = darea.w/8;
>            rect.h = darea.h/8;
>            rect.x = x * rect.w;
>            rect.y = row * rect.h;
>            x = x + 2;
>            SDL_RenderFillRect(renderer, &rect);
>        }
>    }
>}
>
>void
>loop()
>{
>    SDL_Event e;
>    while (SDL_PollEvent(&e)) {
>        if (e.type == SDL_QUIT) {
>            done = 1;
>            return;
>        }
>
>        if ((e.type == SDL_KEYDOWN) && (e.key.keysym.sym == SDLK_ESCAPE)) {
>            done = 1;
>            return;
>        }
>    }
>
>    DrawChessBoard(renderer);
>
>    // YOU ONLY SEE THE BUG IF SRC RECT X,Y ARE 0,
>    // AND IF SRC AND DST W,H MATCH
>    SDL_Rect src, dst;
>    src.x = 0;
>    src.y = 0;
>    src.w = 128;
>    src.h = 128;
>    dst.x = 0;
>    dst.y = 0;
>    dst.w = 128;
>    dst.h = 128;
>    SDL_RenderCopyEx(renderer, texture, &src, &dst, 0, NULL, SDL_FLIP_HORIZONTAL);
>
>    /* Got everything on rendering surface,
>       now Update the drawing image on window screen */
>    SDL_UpdateWindowSurface(window);
>}
>
>int
>main(int argc, char *argv[])
>{
>    SDL_Surface *surface;
>
>    /* Enable standard application logging */
>    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
>
>    /* Initialize SDL */
>    if (SDL_Init(SDL_INIT_VIDEO) != 0) {
>        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_Init fail : %s\n", SDL_GetError());
>        return 1;
>    }
>
>    /* Create window and renderer for given surface */
>    window = SDL_CreateWindow("Chess Board", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, 0);
>    if (!window) {
>        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Window creation fail : %s\n",SDL_GetError());
>        return 1;
>    }
>    surface = SDL_GetWindowSurface(window);
>    renderer = SDL_CreateSoftwareRenderer(surface);
>    if (!renderer) {
>        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Render creation for surface fail : %s\n",SDL_GetError());
>        return 1;
>    }
>
>    texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ABGR8888, SDL_TEXTUREACCESS_STATIC, 256, 256);
>    // make texture
>    unsigned char *dat = (unsigned char *)malloc(256 * 256 * 4);
>    for (int y = 0; y < 256; ++y)
>    {
>        for (int x = 0; x < 256; ++x)
>        {
>            dat[(y * 256 + x) * 4] = x;
>            dat[(y * 256 + x) * 4 + 1] = y;
>            dat[(y * 256 + x) * 4 + 2] = 255 - y;
>            dat[(y * 256 + x) * 4 + 3] = 255;
>        }
>    }
>
>    SDL_UpdateTexture(texture, NULL, dat, 256*4);
>
>    /* Clear the rendering surface with the specified color */
>    SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
>    SDL_RenderClear(renderer);
>
>    /* Draw the Image on rendering surface */
>    done = 0;
>
>    while (!done) {
>        loop();
>    }
>
>    SDL_Quit();
>    free(dat);
>    return 0;
>}
>

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Attachments on bug 4188: 3255 | 3355 | 3381

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.