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annotate src/video/SDL_alphamult.c @ 4425:a3e71b957215

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Fixed bug #961 Kalle Olavi Niemitalo 2010-02-28 09:15:50 PST It seems the SDLK_LMETA and SDLK_RMETA constants have been removed from SDL 1.3. I grepped for them in the SDL source tree and these were the only hits: ./include/SDL_compat.h:230:#define SDLK_LSUPER SDLK_LMETA ./include/SDL_compat.h:231:#define SDLK_RSUPER SDLK_RMETA ./src/video/bwindow/SDL_BWin.h:194: keymap[0x66] = SDLK_LMETA; ./src/video/bwindow/SDL_BWin.h:195: keymap[0x67] = SDLK_RMETA; I don't know how compatible SDL 1.3 is supposed to be with applications designed for SDL 1.2. However, as you can see, SDL itself is still trying to use the removed constants, and that is clearly a bug. Because SDL_compat.h defines KMOD_LMETA as KMOD_LGUI, I suppose it should also define SDLK_LMETA as SDLK_LGUI, and SDLK_RMETA likewise.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 09 Mar 2010 06:07:48 +0000
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 #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: */