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annotate src/video/SDL_yuv.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents 51038e80ae59
children 4da1ee79c9af
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 *
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33 SDL_CreateYUVOverlay (int w, int h, Uint32 format, SDL_Surface * display)
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34 {
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35 SDL_VideoDevice *_this = SDL_GetVideoDevice ();
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36 SDL_Window *window;
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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 window = SDL_GetWindowFromSurface (display);
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41 if (window && (window->flags & SDL_WINDOW_OPENGL)) {
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42 SDL_SetError ("YUV overlays are not supported in OpenGL mode");
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43 return NULL;
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44 }
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45
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46 /* Display directly on video surface, if possible */
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47 if (SDL_getenv ("SDL_VIDEO_YUV_DIRECT")) {
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48 if (window &&
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49 ((window->surface->format->BytesPerPixel == 2) ||
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50 (window->surface->format->BytesPerPixel == 4))) {
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51 display = window->surface;
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52 }
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53 }
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54 overlay = NULL;
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55 yuv_hwaccel = SDL_getenv ("SDL_VIDEO_YUV_HWACCEL");
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56 if (((display->flags & SDL_SCREEN_SURFACE) && _this->CreateYUVOverlay) &&
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57 (!yuv_hwaccel || (SDL_atoi (yuv_hwaccel) > 0))) {
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58 overlay = _this->CreateYUVOverlay (_this, w, h, format, display);
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59 }
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60 /* If hardware YUV overlay failed ... */
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61 if (overlay == NULL) {
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62 overlay = SDL_CreateYUV_SW (_this, w, h, format, display);
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63 }
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64 return overlay;
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65 }
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66
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67 int
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68 SDL_LockYUVOverlay (SDL_Overlay * overlay)
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69 {
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70 SDL_VideoDevice *_this = SDL_GetVideoDevice ();
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71 return overlay->hwfuncs->Lock (_this, overlay);
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72 }
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74 void
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75 SDL_UnlockYUVOverlay (SDL_Overlay * overlay)
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76 {
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77 SDL_VideoDevice *_this = SDL_GetVideoDevice ();
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78 overlay->hwfuncs->Unlock (_this, overlay);
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79 }
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80
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81 int
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82 SDL_DisplayYUVOverlay (SDL_Overlay * overlay, SDL_Rect * dstrect)
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83 {
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84 SDL_VideoDevice *_this = SDL_GetVideoDevice ();
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85 SDL_Rect src, dst;
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86 int srcx, srcy, srcw, srch;
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87 int dstx, dsty, dstw, dsth;
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88
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89 /* Clip the rectangle to the screen area */
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90 srcx = 0;
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91 srcy = 0;
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92 srcw = overlay->w;
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93 srch = overlay->h;
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94 dstx = dstrect->x;
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95 dsty = dstrect->y;
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96 dstw = dstrect->w;
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97 dsth = dstrect->h;
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98 if (dstx < 0) {
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99 srcw += (dstx * overlay->w) / dstrect->w;
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100 dstw += dstx;
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101 srcx -= (dstx * overlay->w) / dstrect->w;
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102 dstx = 0;
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103 }
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104 if ((dstx + dstw) > SDL_VideoSurface->w) {
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105 int extra = (dstx + dstw - SDL_VideoSurface->w);
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106 srcw -= (extra * overlay->w) / dstrect->w;
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107 dstw -= extra;
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108 }
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109 if (dsty < 0) {
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110 srch += (dsty * overlay->h) / dstrect->h;
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111 dsth += dsty;
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112 srcy -= (dsty * overlay->h) / dstrect->h;
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113 dsty = 0;
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114 }
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115 if ((dsty + dsth) > SDL_VideoSurface->h) {
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116 int extra = (dsty + dsth - SDL_VideoSurface->h);
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117 srch -= (extra * overlay->h) / dstrect->h;
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118 dsth -= extra;
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119 }
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120 if (srcw <= 0 || srch <= 0 || srch <= 0 || dsth <= 0) {
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121 return 0;
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122 }
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123 /* Ugh, I can't wait for SDL_Rect to be int values */
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124 src.x = srcx;
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125 src.y = srcy;
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126 src.w = srcw;
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127 src.h = srch;
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128 dst.x = dstx;
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129 dst.y = dsty;
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130 dst.w = dstw;
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131 dst.h = dsth;
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132 return overlay->hwfuncs->Display (_this, overlay, &src, &dst);
0
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133 }
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134
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135 void
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136 SDL_FreeYUVOverlay (SDL_Overlay * overlay)
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137 {
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138 SDL_VideoDevice *_this = SDL_GetVideoDevice ();
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139 if (overlay) {
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140 if (overlay->hwfuncs) {
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141 overlay->hwfuncs->FreeHW (_this, overlay);
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142 }
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143 SDL_free (overlay);
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144 }
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145 }
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146
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147 /* vi: set ts=4 sw=4 expandtab: */