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examples: Much, much easier way to generate thumbnail and onmouseover files.

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This commit is contained in:
Ryan C. Gordon
2025-09-16 12:04:40 -04:00
parent 8bc4e029bd
commit 85ea2bfbf0
2 changed files with 61 additions and 20 deletions
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49
examples/save-rendering-to-bitmaps.h Normal file
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
/*
This is for generating thumbnails and videos of examples. Just include it
temporarily and let it override SDL_RenderPresent, etc, and it'll dump each
frame rendered to a new .bmp file.
*/
static bool SAVERENDERING_SDL_RenderPresent(SDL_Renderer *renderer)
{
static unsigned int framenum = 0;
SDL_Surface *surface = SDL_RenderReadPixels(renderer, NULL);
if (!surface) {
SDL_LogError(SDL_LOG_CATEGORY_RENDER, "Failed to read pixels for frame #%u! (%s)", framenum, SDL_GetError());
} else {
char fname[64];
SDL_snprintf(fname, sizeof (fname), "frame%05u.bmp", framenum);
if (!SDL_SaveBMP(surface, fname)) {
SDL_LogError(SDL_LOG_CATEGORY_RENDER, "Failed to save bmp for frame #%u! (%s)", framenum, SDL_GetError());
}
SDL_DestroySurface(surface);
}
framenum++;
return SDL_RenderPresent(renderer);
}
#define SDL_RenderPresent SAVERENDERING_SDL_RenderPresent