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annotate src/video/SDL_alphamult.h @ 3164:c5b2884c26b4

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Added an ifdef so that if you #define SDL_NO_COMPAT before you include SDL.h then SDL_compat.h will never be included in your code. This is useful for making sure that your code uses only SDL 1.3 features. It is also handy for finding things that are in SDL_compat.h that belong elsewhere.
author Bob Pendleton <bob@pendleton.com>
date Thu, 04 Jun 2009 21:00:45 +0000
parents cd863dd2082b
children f7b03b6838cb
rev   line source
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8d93bfecb9dc Fixed alpha blending textures with the GDI renderer
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /* Functions to pre-multiply the alpha channel into the color channels */
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24
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25 #define DEFINE_PREMULTIPLY_FUNC(fmt) \
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26 void \
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27 SDL_PreMultiplyAlpha##fmt(int w, int h, Uint32 *pixels, int pitch);
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28
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29 /* *INDENT-OFF* */
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30 DEFINE_PREMULTIPLY_FUNC(ARGB8888)
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31 DEFINE_PREMULTIPLY_FUNC(RGBA8888)
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32 DEFINE_PREMULTIPLY_FUNC(ABGR8888)
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33 DEFINE_PREMULTIPLY_FUNC(BGRA8888)
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34 /* *INDENT-ON* */
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35
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36 #undef DEFINE_PREMULTIPLY_FUNC
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37
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38 /* vi: set ts=4 sw=4 expandtab: */