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annotate src/video/SDL_alphamult.h @ 5029:5d7d48157be7

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Greg Jandl to SDL I did some digging, and I think I've found a better solution. By including some additional .m4 macros in the acinclude directory (http://www.gnu.org/software/autoconf-archive/ax_check_compiler_flags.html, http://www.gnu.org/software/autoconf-archive/ax_gcc_archflag.html and http://www.gnu.org/software/autoconf-archive/ax_gcc_x86_cpuid.html) then using the patch below (same as previous patch + one line change to configure.in), SDL will build correctly out of the box. The arch can then be overridden by --with-gcc-arch=<arch> (most will probably want to build with i686 there for general distribution) or --without-gcc-arch, to disable setting the arch all together. On my Atom netbook, I get -march=PentiumPro by default, which works great, as does --with-gcc-arch=i686.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 18 Jan 2011 22:40:45 -0800
parents f7b03b6838cb
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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: */