src/video/SDL_alphamult.h
author Sam Lantinga
Sat, 19 Sep 2009 13:29:40 +0000
changeset 3280 00cace2d9080
parent 3055 cd863dd2082b
child 3697 f7b03b6838cb
permissions -rw-r--r--
Merged a cleaned up version of Jiang's code changes from Google Summer of Code 2009
     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 /* *INDENT-OFF* */
    30 DEFINE_PREMULTIPLY_FUNC(ARGB8888)
    31 DEFINE_PREMULTIPLY_FUNC(RGBA8888)
    32 DEFINE_PREMULTIPLY_FUNC(ABGR8888)
    33 DEFINE_PREMULTIPLY_FUNC(BGRA8888)
    34 /* *INDENT-ON* */
    35 
    36 #undef DEFINE_PREMULTIPLY_FUNC
    37 
    38 /* vi: set ts=4 sw=4 expandtab: */