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    <p>I am assuming that when you say "the latest SDL/GFX libs on Fedora 10," you mean the SDL and SDL_gfx libraries. To properly display PNG images with transparency, ensure that you also have <a href="http://www.libsdl.org/projects/SDL_image" rel="nofollow noreferrer">SDL_image</a> installed; you will need it, unless you have a different library that can load a PNG image into a SDL_Surface.</p> <p>You should not need to use a color key for transparency (unless, of course, you <em>want</em> to use one). As for your problem with using a color key, note that the SDL documentation recommends setting the color key before calling SDL_DisplayFormat():</p> <blockquote> <p>"If you want to take advantage of hardware colorkey or alpha blit acceleration, you should set the colorkey and alpha value before calling this function."</p> </blockquote> <p>You might also want to try using SDL_DisplayFormatAlpha() instead of SDL_DisplayFormat(), like so:</p> <pre><code>SDL_Rect imagePosition = { 50, 50, 0, 0 }; SDL_Surface *image = IMG_Load("example.png"); if (image != NULL) { image = SDL_DisplayFormatAlpha(image); } </code></pre> <p>Later, in your rendering loop, you can then rotate the source image by some floating point <code>angle</code> on to some SDL_Surface <code>screen</code>:</p> <pre><code>if (image != NULL) { SDL_Surface *rotation = rotozoomSurface(image, angle, 1, 1); SDL_BlitSurface(rotation, NULL, screen, &amp;imagePosition); SDL_FreeSurface(rotation); } </code></pre> <p>The above code will properly blit a PNG with transparency, assuming your PNG has proper transparency.</p> <p>Make sure to link with <code>-lSDL_image</code> for the SDL_image library and <code>-lSDL_gfx</code> for the SDL_gfx library, assuming you are using g++ on your Fedora 10 installation. You can also use <code>sdl-config --libs</code> for the required g++ arguments for SDL itself.</p>
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    1. POWhat is the proper way to use GFX rotozoomSurface with SDL for drawing transparent sprites?
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    1. POWhat is the proper way to use GFX rotozoomSurface with SDL for drawing transparent sprites?
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    1. COThe above code gave me the same results, so I found some other png's and it worked fine along with my original code. The png that I was using for testing was somehow bad. Thanks!
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