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annotate src/video/SDL_alphamult.c @ 3097:0d12e8f1de3c

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Date: Thu, 05 Feb 2009 18:07:35 +0100 From: Stefan Klug Subject: [SDL] SDL 1.3 WinCE backend as promised, I've started to work on the WinCE backend of SDL 1.3 I've modified the win32 video backend and the gdi renderer, to work properly in WinCE. The results till now are great, but there is still some work to do. Attached are two patches with my changes. I would be happy if someone could review and propably commit them. The first one (configure.in.patch) should be straight forward without any side effects. The second one does the necessary changes to the win32 backend. I was really unhappy to start slicing this shiny new backend with #ifdef/#endif but I saw no other option. The most problematic issues are: - WinCe has no GetDIBits, so its practically impossible to fill a BITMAPINFO with correct values. I therefore removed the bmi member from the GDI_RenderData in SDL_gdirender.c to prevent usage of a not or not properly initialized bmi. - In SDL_win32window.c I exchanged some ASCII function by their general counterparts, (In CE only the Unicode versions are available). I don't know if this has a negative effect when running in win32 Cheers Stefan
author Sam Lantinga <slouken@libsdl.org>
date Mon, 23 Mar 2009 05:35:21 +0000
parents cd863dd2082b
children f7b03b6838cb
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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: */