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annotate src/video/cybergfx/SDL_cgxyuv.c @ 1023:e719ee25439d

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Fix potential use of freed memory in the threaded timer system
author Sam Lantinga <slouken@libsdl.org>
date Tue, 04 Jan 2005 19:05:32 +0000
parents b8d311d90021
children c9b51268668f
rev   line source
21
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
21
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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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* This is the XFree86 Xv extension implementation of YUV video overlays */
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29
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30 #ifdef XFREE86_XV
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31
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32 #include <stdlib.h>
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33 #include <string.h>
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34 #include <X11/Xlib.h>
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35 #include <sys/ipc.h>
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36 #include <sys/shm.h>
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37 #include <X11/extensions/XShm.h>
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38 #include <X11/extensions/Xvlib.h>
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39
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40 #include "SDL_error.h"
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41 #include "SDL_video.h"
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42 #include "SDL_x11yuv_c.h"
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43 #include "SDL_yuvfuncs.h"
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44
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45 /* The functions used to manipulate software video overlays */
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46 static struct private_yuvhwfuncs x11_yuvfuncs = {
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47 X11_LockYUVOverlay,
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48 X11_UnlockYUVOverlay,
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49 X11_DisplayYUVOverlay,
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50 X11_FreeYUVOverlay
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51 };
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52
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53 struct private_yuvhwdata {
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54 int port;
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55 XShmSegmentInfo yuvshm;
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56 XvImage *image;
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57 };
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58
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59
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60 SDL_Overlay *X11_CreateYUVOverlay(_THIS, int width, int height, Uint32 format, SDL_Surface *display)
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61 {
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62 SDL_Overlay *overlay;
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63 struct private_yuvhwdata *hwdata;
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64 int xv_port;
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65 int i, j;
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66 int adaptors;
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67 XvAdaptorInfo *ainfo;
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68 XShmSegmentInfo *yuvshm;
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69
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70 xv_port = -1;
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71 if ( (Success == XvQueryExtension(GFX_Display, &j, &j, &j, &j, &j)) &&
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72 (Success == XvQueryAdaptors(GFX_Display,
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73 RootWindow(GFX_Display, SDL_Screen),
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74 &adaptors, &ainfo)) ) {
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75 for ( i=0; (i<adaptors) && (xv_port == -1); ++i ) {
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76 if ( (ainfo[i].type & XvInputMask) &&
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77 (ainfo[i].type & XvImageMask) ) {
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78 int num_formats;
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79 XvImageFormatValues *formats;
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80 formats = XvListImageFormats(GFX_Display,
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81 ainfo[i].base_id, &num_formats);
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82 for ( j=0; j<num_formats; ++j ) {
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83 if ( (Uint32)formats[j].id == format ) {
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84 xv_port = ainfo[i].base_id;
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85 break;
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86 }
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87 }
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88 }
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89 }
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90 }
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91 if ( xv_port == -1 ) {
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92 SDL_SetError("No available video ports for requested format");
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93 return(NULL);
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94 }
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95
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96 /* Create the overlay structure */
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97 overlay = (SDL_Overlay *)malloc(sizeof *overlay);
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98 if ( overlay == NULL ) {
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99 SDL_OutOfMemory();
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100 return(NULL);
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101 }
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102 memset(overlay, 0, (sizeof *overlay));
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103
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104 /* Fill in the basic members */
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105 overlay->format = format;
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106 overlay->w = width;
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107 overlay->h = height;
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108
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109 /* Set up the YUV surface function structure */
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110 overlay->hwfuncs = &x11_yuvfuncs;
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111
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112 /* Create the pixel data and lookup tables */
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113 hwdata = (struct private_yuvhwdata *)malloc(sizeof *hwdata);
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114 overlay->hwdata = hwdata;
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115 if ( hwdata == NULL ) {
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116 SDL_OutOfMemory();
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117 SDL_FreeYUVOverlay(overlay);
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118 return(NULL);
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119 }
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120 yuvshm = &hwdata->yuvshm;
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121 memset(yuvshm, 0, sizeof(*yuvshm));
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122 hwdata->port = xv_port;
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123 hwdata->image = XvShmCreateImage(GFX_Display, xv_port, format,
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124 0, width, height, yuvshm);
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125 if ( hwdata->image == NULL ) {
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126 SDL_OutOfMemory();
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127 SDL_FreeYUVOverlay(overlay);
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128 return(NULL);
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129 }
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130 yuvshm->shmid = shmget(IPC_PRIVATE, hwdata->image->data_size,
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131 IPC_CREAT | 0777);
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132 if ( yuvshm->shmid < 0 ) {
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133 SDL_SetError("Unable to get %d bytes shared memory",
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134 hwdata->image->data_size);
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135 SDL_FreeYUVOverlay(overlay);
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136 return(NULL);
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137 }
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138 yuvshm->shmaddr = (caddr_t) shmat(yuvshm->shmid, 0, 0);
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139 yuvshm->readOnly = False;
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140 hwdata->image->data = yuvshm->shmaddr;
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141
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142 XShmAttach(GFX_Display, yuvshm);
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143 XSync(GFX_Display, False);
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144 shmctl(yuvshm->shmid, IPC_RMID, 0);
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145
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146 /* We're all done.. */
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147 return(overlay);
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148 }
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149
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150 int X11_LockYUVOverlay(_THIS, SDL_Overlay *overlay)
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151 {
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152 overlay->pixels = overlay->hwdata->image->data;
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153 /* What should the pitch be set to? */
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154 return(0);
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155 }
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156
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157 void X11_UnlockYUVOverlay(_THIS, SDL_Overlay *overlay)
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158 {
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159 overlay->pixels = NULL;
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160 }
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161
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162 int X11_DisplayYUVOverlay(_THIS, SDL_Overlay *overlay, SDL_Rect *dstrect)
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163 {
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164 struct private_yuvhwdata *hwdata;
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165
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166 hwdata = overlay->hwdata;
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167 XvShmPutImage(GFX_Display, hwdata->port, SDL_Window, SDL_GC,
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168 hwdata->image, 0, 0, overlay->w, overlay->h,
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169 dstrect->x, dstrect->y, dstrect->w, dstrect->h, False);
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170 XSync(GFX_Display, False);
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171 return(0);
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172 }
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173
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174 void X11_FreeYUVOverlay(_THIS, SDL_Overlay *overlay)
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175 {
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176 struct private_yuvhwdata *hwdata;
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177
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178 hwdata = overlay->hwdata;
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179 if ( hwdata ) {
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180 if ( hwdata->yuvshm.shmaddr ) {
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181 XShmDetach(GFX_Display, &hwdata->yuvshm);
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182 shmdt(hwdata->yuvshm.shmaddr);
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183 }
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184 if ( hwdata->image ) {
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185 XFree(hwdata->image);
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186 }
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187 free(hwdata);
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188 }
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189 }
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190
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191 #endif /* XFREE86_XV */