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How do I find the color of a surface's pixel in RGBA , inclu |  |
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Parikshit Singh
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I have a surface with me in SDL which has some alpha in it. I want to
find the alpha value of a specific pixel. I also wanted to know if I can fill a pixel with alpha (erasing the pixel). _______________________________________________ SDL mailing list http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org |
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mr_tawan
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Here's the basic idea.
1. Lock the surface using SDL_LockSurface(). 2. Get the pixel value from the buffer at `surface->pixels`. Use the pitch and row to calculate the exact location of the pixel. 3. After get the pixel value, use `SDL_GetRGBA` to get the r,g,b,a value of that pixel. The pixel format is available at `surface->format`. 4. Unlock the surface |
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