Ryan C. Gordon
90efb63e52
examples: Improve webpage generation in various ways, add thumbnails, etc.
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4 月之前 | |
|---|---|---|
| .. | ||
| README.txt | 6 月之前 | |
| onmouseover.webp | 4 月之前 | |
| read-pixels.c | 6 月之前 | |
| thumbnail.png | 4 月之前 | |
README.txt
This example creates an SDL window and renderer, and draws a
rotating texture to it, reads back the rendered pixels, converts them to
black and white, and then draws the converted image to a corner of the
screen.
This isn't necessarily an efficient thing to do--in real life one might
want to do this sort of thing with a render target--but it's just a visual
example of how to use SDL_RenderReadPixels().
A better, but less visual, use of SDL_RenderReadPixels() is to make
screenshots: you grab the current contents of the screen, and save the pixels
as a bitmap file or whatever.
rotating texture to it, reads back the rendered pixels, converts them to
black and white, and then draws the converted image to a corner of the
screen.
This isn't necessarily an efficient thing to do--in real life one might
want to do this sort of thing with a render target--but it's just a visual
example of how to use SDL_RenderReadPixels().
A better, but less visual, use of SDL_RenderReadPixels() is to make
screenshots: you grab the current contents of the screen, and save the pixels
as a bitmap file or whatever.