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.

Test case showing colour key conversion bug

colour_key_conversion_test.c (text/plain), 2.70 KB, created by Edmund Horner on 2015-05-10 09:39:04 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Edmund Horner

Created: 2015-05-10 09:39:04 UTC

Size: 2.70 KB

patch

obsolete

>// TO COMPILE:   gcc -o test colour_key_conversion_test.c -lSDL2
>// AND RUN:      ./test
>
>#include <stdio.h>
>
>#include <SDL2/SDL.h>
>
>// smiley face image with transparency
>unsigned short pixel_data[] = {
>	0xB54A, 0xB54A, 0xB54A, 0xB54A, 0xB54A,
>	0xB54A, 0x0000, 0xB54A, 0x0000, 0xB54A,
>	0xB54A, 0xB54A, 0xB54A, 0xB54A, 0xB54A,
>	0x0000, 0xB54A, 0xB54A, 0xB54A, 0x0000,
>	0xB54A, 0x0000, 0x0000, 0x0000, 0xB54A
>};
>
>int main(int argc, char *argv[]) {
>    int w = 5, h = 5;
>
>    SDL_Init(SDL_INIT_VIDEO);
>
>    SDL_Window *window = SDL_CreateWindow("Color key conversion test", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 100, 100, 0);
>    SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, 0);
>    SDL_RenderSetScale(renderer, 8, 8);
>
>    // create green background surface
>    SDL_Surface *background = SDL_CreateRGBSurface(0, 12, 12, 32, 0,0,0,0);
>    SDL_Rect bg_rect = { 0, 0, 12, 12 };
>    SDL_FillRect(background, &bg_rect, SDL_MapRGB(background->format, 100,200,100));
>
>    // create 16-bit surface
>    SDL_Surface *surface = SDL_CreateRGBSurfaceFrom(pixel_data, w, h, 16, w*2, 0x0000f800,0x000007e0,0x0000001f,0);
>    SDL_SetColorKey(surface, SDL_TRUE, 0xB54A);
>    
>    // blit original surface to left hand side of background
>    SDL_Rect tgt_rect = { 0, 0, 5, 5 };
>    SDL_BlitSurface(surface, NULL, background, &tgt_rect);
>
>    // convert surface to 32-bit (suitable for window)
>    Uint32 pf = SDL_GetWindowPixelFormat(window);
>    SDL_Surface *new_surface = SDL_ConvertSurfaceFormat(surface, pf, 0);
>
>    // blit converted surface to right hand side
>    SDL_Rect tgt_rect2 = { 6, 0, 5, 5 };
>    SDL_BlitSurface(new_surface, NULL, background, &tgt_rect2);
>    
>    // show everything
>    SDL_Texture *bg_tex = SDL_CreateTextureFromSurface(renderer, background);
>    SDL_RenderCopy(renderer, bg_tex, NULL, &bg_rect);
>    SDL_RenderPresent(renderer);
>
>    // print value of first pixel
>    Uint32 first_pixel = ((Uint32 *) new_surface->pixels)[0];
>    Uint8 r,g,b,a;
>    SDL_GetRGBA(first_pixel, new_surface->format, &r,&g,&b,&a);
>    printf("First pixel = %08x (%d,%d,%d alpha %d)\n", first_pixel, r,g,b,a);
>    // print value of colour key
>    Uint32 colour_key;
>    SDL_GetColorKey(new_surface, &colour_key);
>    SDL_GetRGB(colour_key, new_surface->format, &r,&g,&b);
>    printf("colour key  = %08x (%d,%d,%d)\n", colour_key, r,g,b);
>
>    int waiting = 1;
>    while (waiting) {
>	SDL_Event evt;
>	SDL_WaitEvent(&evt);
>	if (evt.type == SDL_QUIT)
>	    waiting = 0;
>    }
>
>    SDL_FreeSurface(new_surface);
>    SDL_FreeSurface(surface);
>    SDL_DestroyTexture(bg_tex);
>    SDL_DestroyRenderer(renderer);
>    SDL_DestroyWindow(window);
>    SDL_Quit();
>
>    return 0;
>}

Actions: View

Attachments on bug 2979: 2153 | 2608 | 2609 | 2936

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.