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From: "Alex Volkov" Date: Thu, 10 Nov 2005 21:53:40 -0500 Subject: [SDL] BUG[?]: 32bpp RGBA->RGB colorkey blit, no SDL_SRCALPHA It seems there is either a documentation vs. reality mismatch or a real bug in SDL_blit_N.c:BlitNtoNKey(). The exact blit in question is a 32bpp RGBA->RGB, where RGBA has SDL_COLORKEY and *no* SDL_SRCALPHA flags. The doc in SDL_video.h states: * RGBA->RGB: * SDL_SRCALPHA not set: * copy RGB. * if SDL_SRCCOLORKEY set, only copy the pixels matching the * RGB values of the source colour key, ignoring alpha in the * comparison. BlitNtoNKey(), however, forgets to "ignore alpha in the comparison". The documentation makes perfect sense, so I think it is the code that is faulty. The attached patch corrects the code.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 15 Mar 2006 15:43:15 +0000
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2 To compile and install SDL:
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4 1. Run './configure; make; make install'
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6 If you are compiling for Windows using gcc, read the FAQ at:
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7 http://www.libsdl.org/faq.php?action=listentries&category=4#42
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9 If you are compiling using Visual C++ on Win32, you should read
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10 the file VisualC.html
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12 2. Look at the example programs in ./test, and check out the HTML
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13 documentation in ./docs to see how to use the SDL library.
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15 3. Join the SDL developer mailing list by sending E-mail to
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16 sdl-request@libsdl.org
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17 and put "subscribe" in the subject of the message.
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19 Or alternatively you can use the web interface:
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20 http://www.libsdl.org/mailing-list.php
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22 That's it!
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23 Sam Lantinga <slouken@libsdl.org>