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annotate src/video/SDL_alphamult.h @ 4573:6399178be313

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Completed work on X11_CreateTexture. Added lots of safety features. These include support for drawing a texture using the core protocol while other textures are drawn using Xrender if Xrender does not support the color format of the said texture or any other fault with Xrender.
author Sunny Sachanandani <sunnysachanandani@gmail.com>
date Fri, 28 May 2010 20:40:09 +0530
parents f7b03b6838cb
children
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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: */