annotate src/video/SDL_yuv.c @ 1856:21f13c787b46

Date: Mon, 22 May 2006 01:16:47 -0400 From: Mike Frysinger Subject: [SDL] [patch] fix sed expression in sdl-config just noticed that sdl-config uses '[a-z]' with sed in sdl-config without forcing the locale to C ... this could cause problems with locales where the letter 'z' is not the last letter in the alphabet
author Sam Lantinga <slouken@libsdl.org>
date Tue, 23 May 2006 15:07:56 +0000
parents 51038e80ae59
children 782fd950bd46 9a7c62bbc8b3
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 /* This is the implementation of the YUV video surface support */
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25
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26 #include "SDL_video.h"
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27 #include "SDL_sysvideo.h"
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28 #include "SDL_yuvfuncs.h"
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29 #include "SDL_yuv_sw_c.h"
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30
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31
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32 SDL_Overlay *SDL_CreateYUVOverlay(int w, int h, Uint32 format,
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33 SDL_Surface *display)
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34 {
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35 SDL_VideoDevice *video = current_video;
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36 SDL_VideoDevice *this = current_video;
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37 const char *yuv_hwaccel;
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38 SDL_Overlay *overlay;
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39
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40 if ( (display->flags & SDL_OPENGL) == SDL_OPENGL ) {
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41 SDL_SetError("YUV overlays are not supported in OpenGL mode");
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42 return NULL;
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43 }
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44
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45 /* Display directly on video surface, if possible */
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46 if ( SDL_getenv("SDL_VIDEO_YUV_DIRECT") ) {
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47 if ( (display == SDL_PublicSurface) &&
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48 ((SDL_VideoSurface->format->BytesPerPixel == 2) ||
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49 (SDL_VideoSurface->format->BytesPerPixel == 4)) ) {
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50 display = SDL_VideoSurface;
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51 }
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52 }
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53 overlay = NULL;
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54 yuv_hwaccel = SDL_getenv("SDL_VIDEO_YUV_HWACCEL");
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55 if ( ((display == SDL_VideoSurface) && video->CreateYUVOverlay) &&
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56 (!yuv_hwaccel || (SDL_atoi(yuv_hwaccel) > 0)) ) {
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57 overlay = video->CreateYUVOverlay(this, w, h, format, display);
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58 }
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59 /* If hardware YUV overlay failed ... */
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60 if ( overlay == NULL ) {
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61 overlay = SDL_CreateYUV_SW(this, w, h, format, display);
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62 }
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63 return overlay;
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64 }
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65
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66 int SDL_LockYUVOverlay(SDL_Overlay *overlay)
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67 {
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68 return overlay->hwfuncs->Lock(current_video, overlay);
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69 }
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70
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71 void SDL_UnlockYUVOverlay(SDL_Overlay *overlay)
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72 {
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73 overlay->hwfuncs->Unlock(current_video, overlay);
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74 }
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75
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76 int SDL_DisplayYUVOverlay(SDL_Overlay *overlay, SDL_Rect *dstrect)
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77 {
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78 SDL_Rect src, dst;
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79 int srcx, srcy, srcw, srch;
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80 int dstx, dsty, dstw, dsth;
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81
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82 /* Clip the rectangle to the screen area */
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83 srcx = 0;
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84 srcy = 0;
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85 srcw = overlay->w;
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86 srch = overlay->h;
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87 dstx = dstrect->x;
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88 dsty = dstrect->y;
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89 dstw = dstrect->w;
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90 dsth = dstrect->h;
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91 if ( dstx < 0 ) {
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92 srcw += (dstx * overlay->w) / dstrect->w;
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93 dstw += dstx;
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94 srcx -= (dstx * overlay->w) / dstrect->w;
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95 dstx = 0;
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96 }
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97 if ( (dstx+dstw) > current_video->screen->w ) {
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98 int extra = (dstx+dstw - current_video->screen->w);
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99 srcw -= (extra * overlay->w) / dstrect->w;
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100 dstw -= extra;
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101 }
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102 if ( dsty < 0 ) {
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103 srch += (dsty * overlay->h) / dstrect->h;
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104 dsth += dsty;
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105 srcy -= (dsty * overlay->h) / dstrect->h;
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106 dsty = 0;
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107 }
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108 if ( (dsty+dsth) > current_video->screen->h ) {
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109 int extra = (dsty+dsth - current_video->screen->h);
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110 srch -= (extra * overlay->h) / dstrect->h;
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111 dsth -= extra;
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112 }
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113 if ( srcw <= 0 || srch <= 0 ||
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114 srch <= 0 || dsth <= 0 ) {
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115 return 0;
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116 }
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117 /* Ugh, I can't wait for SDL_Rect to be int values */
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118 src.x = srcx;
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119 src.y = srcy;
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120 src.w = srcw;
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121 src.h = srch;
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122 dst.x = dstx;
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123 dst.y = dsty;
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124 dst.w = dstw;
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125 dst.h = dsth;
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126 return overlay->hwfuncs->Display(current_video, overlay, &src, &dst);
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127 }
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128
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129 void SDL_FreeYUVOverlay(SDL_Overlay *overlay)
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130 {
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131 if ( overlay ) {
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132 if ( overlay->hwfuncs ) {
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133 overlay->hwfuncs->FreeHW(current_video, overlay);
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134 }
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135 SDL_free(overlay);
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136 }
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137 }