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comparison src/video/SDL_alphamult.h @ 3054:8d93bfecb9dc

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Fixed alpha blending textures with the GDI renderer
author Sam Lantinga <slouken@libsdl.org>
date Sat, 07 Feb 2009 17:56:08 +0000
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children cd863dd2082b
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3053:aa34d1180d30 3054:8d93bfecb9dc
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2009 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
19 Sam Lantinga
20 slouken@libsdl.org
21 */
22
23 /* Functions to pre-multiply the alpha channel into the color channels */
24
25 #define DEFINE_PREMULTIPLY_FUNC(fmt) \
26 void \
27 SDL_PreMultiplyAlpha##fmt(int w, int h, Uint32 *pixels, int pitch);
28
29 DEFINE_PREMULTIPLY_FUNC(ARGB8888)
30 DEFINE_PREMULTIPLY_FUNC(RGBA8888)
31 DEFINE_PREMULTIPLY_FUNC(ABGR8888)
32 DEFINE_PREMULTIPLY_FUNC(BGRA8888)
33
34 #undef DEFINE_PREMULTIPLY_FUNC
35
36 /* vi: set ts=4 sw=4 expandtab: */