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annotate src/video/SDL_alphamult.c @ 3235:d35b649858e0

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David Carre to Sam Hello sam, me again. I'v fixed another bug in the pandora code, it's on the no-X videodriver, i forgot to add some code to destroy the window so it was impossible to reload SDL inside the same application (eglTerminate). You'll find the svn diff attached. See you, David.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 11 Aug 2009 13:45:01 +0000
parents cd863dd2082b
children f7b03b6838cb
rev   line source
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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 #include "SDL_config.h"
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23
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24 #include "SDL_blit.h"
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25 #include "SDL_alphamult.h"
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26
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27 /* Functions to pre-multiply the alpha channel into the color channels */
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28
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29 #define DEFINE_PREMULTIPLY_FUNC(fmt) \
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30 void \
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31 SDL_PreMultiplyAlpha##fmt(int w, int h, Uint32 *pixels, int pitch) \
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32 { \
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33 pitch /= 4; \
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34 while (h--) { \
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35 int n; \
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36 Uint32 *row = pixels; \
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37 Uint32 pixel; \
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38 unsigned r, g, b, a; \
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39 \
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40 for (n = w; n--; ) { \
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41 pixel = *row; \
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42 RGBA_FROM_##fmt(pixel, r, g, b, a); \
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43 r = (r * a) / 255; \
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44 g = (g * a) / 255; \
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45 b = (b * a) / 255; \
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46 fmt##_FROM_RGBA(*row, r, g, b, a); \
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47 ++row; \
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48 } \
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49 pixels += pitch; \
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50 } \
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51 }
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52
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53 /* *INDENT-OFF* */
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54 DEFINE_PREMULTIPLY_FUNC(ARGB8888)
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55 DEFINE_PREMULTIPLY_FUNC(RGBA8888)
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56 DEFINE_PREMULTIPLY_FUNC(ABGR8888)
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57 DEFINE_PREMULTIPLY_FUNC(BGRA8888)
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58 /* *INDENT-ON* */
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59
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60 /* vi: set ts=4 sw=4 expandtab: */