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Test case that blits an RGB888 surfaces with the BLEND blend mode and the RLE hint.

rlesurftest.c (text/x-csrc), 3.54 KB, created by Simon Hug on 2018-04-24 13:12:33 UTC

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Filename:

MIME Type:

Creator: Simon Hug

Created: 2018-04-24 13:12:33 UTC

Size: 3.54 KB

patch

obsolete

>#include <SDL.h>
>
>int main(int argc, char * argv[])
>{
>	SDL_Window * window;
>	SDL_Surface * screen, * surface1, * surface2;
>	SDL_Rect dstrect;
>	SDL_Event e;
>	int i, done = 0;
>
>	if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS | SDL_INIT_TIMER) < 0) {
>		SDL_Log("Failed to initialize SDL: %s", SDL_GetError());
>		return 1;
>	}
>
>	window = SDL_CreateWindow("RLE Surface test", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 600, 300, 0);
>	if (window == NULL){
>		SDL_Log("Failed to create window: %s", SDL_GetError());
>		SDL_Quit();
>		return 1;
>	}
>
>	screen = SDL_GetWindowSurface(window);
>	surface1 = SDL_CreateRGBSurfaceWithFormat(0, 256, 256, 0, SDL_PIXELFORMAT_RGB888);
>	surface2 = SDL_CreateRGBSurfaceWithFormat(0, 256, 256, 0, SDL_PIXELFORMAT_RGB888);
>
>	/* Setting blend mode. This adds SDL_COPY_ADD to the map info flags. */
>	SDL_SetSurfaceBlendMode(surface1, SDL_BLENDMODE_BLEND);
>	SDL_SetSurfaceBlendMode(surface2, SDL_BLENDMODE_BLEND);
>
>	/* Make window background colorful. */
>	for (i = 0; i < screen->h; i++) {
>		dstrect.x = 0;
>		dstrect.y = i;
>		dstrect.w = screen->w;
>		dstrect.h = 1;
>		SDL_FillRect(screen, &dstrect, SDL_MapRGB(screen->format, (Uint8)(i * 132), (Uint8)(i * 18), (Uint8)(i * 211)));
>	}
>
>	/* Paint entire surface green and then a black plus in the middle. */
>	SDL_FillRect(surface1, NULL, SDL_MapRGB(surface1->format, 0, 255, 0));
>	dstrect.x = 128 - 40;
>	dstrect.y = 40;
>	dstrect.w = 80;
>	dstrect.h = 256 - 80;
>	SDL_FillRect(surface1, &dstrect, SDL_MapRGB(surface1->format, 0, 0, 0));
>	dstrect.x = 40;
>	dstrect.y = 128 - 40;
>	dstrect.w = 256 - 80;
>	dstrect.h = 80;
>	SDL_FillRect(surface1, &dstrect, SDL_MapRGB(surface1->format, 0, 0, 0));
>
>	/* Set RLE hint for the second surface. */
>	SDL_SetSurfaceRLE(surface2, 1);
>
>	/* Copy first surface to second surface. */
>	SDL_BlitSurface(surface1, NULL, surface2, NULL);
>
>
>	/* Blit non-RLE surface on the left side of the window. */
>	dstrect.x = 10;
>	dstrect.y = 10;
>	dstrect.w = 256;
>	dstrect.h = 256;
>	SDL_BlitSurface(surface1, NULL, screen, &dstrect);
>
>	/* Blit RLE surface on the right side of the window.
>	 * When SDL_CalculateBlit checks if the RLE hit is set on the source, it
>	 * calls SDL_RLESurface which will check if the surface is eligible for RLE.
>	 * The following things are tested:
>	 *
>	 *  - If bit depth is larger than 8.
>	 *  - If SDL_COPY_COLORKEY or SDL_COPY_BLEND flag is set.
>	 *  - If SDL_COPY_MODULATE_COLOR is not set.
>	 *  - If there's no alpha channel, if SDL_COPY_MODULATE_ALPHA is set.
>	 *  - If SDL_COPY_ADD is not set.
>	 *  - If SDL_COPY_MOD is not set.
>	 *  - If SDL_COPY_NEAREST is not set.
>	 *
>	 * The second surface passes these tests. SDL_RLESurface now decides which
>	 * blit function it should take. For the color key blit, the surface
>	 * must not have an alpha channel or the SDL_COPY_BLEND must not be set:
>	 *
>	 * (!surface->format->Amask || !(flags & SDL_COPY_BLEND))
>	 *
>	 * The second surface passes because it doesn't have an alpha channel.
>	 * The color key blit always assumes that the surface has a valid color key
>	 * and encodes the value in the colorkey member as pixels to skip.
>	 */
>	dstrect.x = 290;
>	dstrect.y = 10;
>	dstrect.w = 256;
>	dstrect.h = 256;
>	SDL_BlitSurface(surface2, NULL, screen, &dstrect);
>
>	while (!done) {
>		while(SDL_PollEvent(&e)) {
>			switch (e.type) {
>			case SDL_QUIT:
>				done = 1;
>				break;
>			case SDL_KEYUP:
>				if (e.key.keysym.sym == SDLK_ESCAPE) {
>					done = 1;
>				}
>				break;
>			}
>		}
>
>		SDL_UpdateWindowSurface(window);
>	}
>
>	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.