Mercurial > sdl-ios-xcode
annotate INSTALL @ 688:c0522010bb6d
Date: Tue, 12 Aug 2003 14:26:19 +0200 (MEST)
From: "Mattias Engdeg?rd"
Subject: bug in SDL_GetRGB/GetRGBA
There's an embarrassing bug in GetRGB/GetRGBA which apparently has been there
for years. It incorrectly converts colours with < 8 bits/channel.
It came to my attention today in #sdl.
What it does now is (for each channel):
rv = (pixel & fmt->Rmask) >> fmt->Rshift;
*r = (rv << fmt->Rloss) + (rv >> (8 - fmt->Rloss));
which is wrong; the last line should be
*r = (rv << fmt->Rloss) + (rv >> (8 - (fmt->Rloss << 1)));
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 12 Aug 2003 15:17:20 +0000 |
| parents | 263e4884f70d |
| children | 0a45995a7fc3 |
| rev | line source |
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| 0 | 1 |
| 2 To compile and install SDL: | |
| 3 | |
| 4 1. Run './configure; make; make install' | |
| 5 | |
| 6 If you are cross-compiling from Linux to Win32, you should read | |
| 7 the file README.Win32 | |
| 8 | |
| 9 If you are compiling using Visual C++ on Win32, you should read | |
| 10 the file VisualC.html | |
| 11 | |
| 12 2. Look at the example programs in ./test, and check out the HTML | |
| 13 documentation in ./docs to see how to use the SDL library. | |
| 14 | |
| 15 3. Join the SDL developer mailing list by sending E-mail to | |
|
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Sam Lantinga <slouken@libsdl.org>
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16 sdl-request@libsdl.org |
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Sam Lantinga <slouken@libsdl.org>
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17 and put "subscribe" in the subject of the message. |
| 0 | 18 |
|
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Sam Lantinga <slouken@libsdl.org>
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19 Or alternatively you can use the web interface: |
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Sam Lantinga <slouken@libsdl.org>
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20 http://www.libsdl.org/mailing-list.php |
| 0 | 21 |
| 22 That's it! | |
| 23 Sam Lantinga <slouken@libsdl.org> |