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annotate src/video/SDL_yuv_sw_c.h @ 3335:b8d313de8a65

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Adam Strzelecki to SDL Since current DirectFB implementation is incomplete for YUV surfaces (actually causes segmentation faults when trying Lock and use YUV planar textures) I decided to fix it a bit. Here's a patch that should make DirectFB properly support YUV both packed and planar (3 planes). (1) Removed SDL_BYTESPERPIXEL at all in favor of DFB_BYTES_PER_PIXEL(SDLToDFBPixelFormat(fmt)) which does return always proper BPP for YUVs too, coz SDL_BYTESPERPIXEL returns incorrect values for FOURCCs (2) Fixed data->pixels allocation for planar YUVs in CreateTexture, it should allocate 150% more space (3) Copy other planes for planar YUVs in UpdateTexture (4) Moved checking if format is supported at all with DirectFB on CreateTexture at the beginning of the code Waiting for comments, -- Adam Strzelecki | nanoant.com
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Oct 2009 04:03:37 +0000
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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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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_video.h"
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25 #include "SDL_sysvideo.h"
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26
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27 /* This is the software implementation of the YUV texture support */
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28
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29 struct SDL_SW_YUVTexture
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30 {
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31 Uint32 format;
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32 Uint32 target_format;
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33 int w, h;
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34 Uint8 *pixels;
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35 int *colortab;
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36 Uint32 *rgb_2_pix;
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37 void (*Display1X) (int *colortab, Uint32 * rgb_2_pix,
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38 unsigned char *lum, unsigned char *cr,
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39 unsigned char *cb, unsigned char *out,
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40 int rows, int cols, int mod);
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41 void (*Display2X) (int *colortab, Uint32 * rgb_2_pix,
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42 unsigned char *lum, unsigned char *cr,
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43 unsigned char *cb, unsigned char *out,
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44 int rows, int cols, int mod);
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45
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46 /* These are just so we don't have to allocate them separately */
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47 Uint16 pitches[3];
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48 Uint8 *planes[3];
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49
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50 /* This is a temporary surface in case we have to stretch copy */
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51 SDL_Surface *stretch;
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52 SDL_Surface *display;
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53 };
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54
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55 typedef struct SDL_SW_YUVTexture SDL_SW_YUVTexture;
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56
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57 SDL_SW_YUVTexture *SDL_SW_CreateYUVTexture(Uint32 format, int w, int h);
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58 int SDL_SW_QueryYUVTexturePixels(SDL_SW_YUVTexture * swdata, void **pixels,
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59 int *pitch);
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60 int SDL_SW_UpdateYUVTexture(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
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61 const void *pixels, int pitch);
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62 int SDL_SW_LockYUVTexture(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
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63 int markDirty, void **pixels, int *pitch);
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64 void SDL_SW_UnlockYUVTexture(SDL_SW_YUVTexture * swdata);
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65 int SDL_SW_CopyYUVToRGB(SDL_SW_YUVTexture * swdata, const SDL_Rect * srcrect,
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66 Uint32 target_format, int w, int h, void *pixels,
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67 int pitch);
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68 void SDL_SW_DestroyYUVTexture(SDL_SW_YUVTexture * swdata);
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69
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70 /* vi: set ts=4 sw=4 expandtab: */