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annotate src/video/SDL_alphamult.h @ 5150:ad50b3db78bd

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The rendering functions take a context so it's clear what window they're drawing to. This also potentially opens to the door to multi-threaded rendering in the future.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 01 Feb 2011 19:19:43 -0800
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
8d93bfecb9dc Fixed alpha blending textures with the GDI renderer
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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: */