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annotate src/video/x11/SDL_x11framebuffer.c @ 5221:16d5e8e90e01

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Updated testoverlay2 to use the SDL 2D rendering API
author Sam Lantinga <slouken@libsdl.org>
date Mon, 07 Feb 2011 00:46:43 -0800
parents 073b86030262
children b530ef003506
rev   line source
5185
073b86030262 Added the X11 framebuffer implementation. Simple! :)
Sam Lantinga <slouken@libsdl.org>
parents:
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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
073b86030262 Added the X11 framebuffer implementation. Simple! :)
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
073b86030262 Added the X11 framebuffer implementation. Simple! :)
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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_x11video.h"
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25 #include "SDL_x11framebuffer.h"
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26
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27
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28 #ifndef NO_SHARED_MEMORY
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29
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30 /* Shared memory error handler routine */
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31 static int shm_error;
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32 static int (*X_handler)(Display *, XErrorEvent *) = NULL;
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33 static int shm_errhandler(Display *d, XErrorEvent *e)
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34 {
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35 if ( e->error_code == BadAccess ) {
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36 shm_error = True;
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37 return(0);
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38 } else
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39 return(X_handler(d,e));
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40 }
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41
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42 static SDL_bool have_mitshm(void)
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43 {
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44 /* Only use shared memory on local X servers */
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45 if ( (SDL_strncmp(XDisplayName(NULL), ":", 1) == 0) ||
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46 (SDL_strncmp(XDisplayName(NULL), "unix:", 5) == 0) ) {
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47 return SDL_X11_HAVE_SHM;
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48 }
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49 return SDL_FALSE;
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50 }
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51
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52 #endif /* !NO_SHARED_MEMORY */
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53
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54 int
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55 X11_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format,
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56 void ** pixels, int *pitch)
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57 {
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58 SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
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59 Display *display = data->videodata->display;
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60 XGCValues gcv;
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61 XVisualInfo vinfo;
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62
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63 /* Free the old framebuffer surface */
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64 X11_DestroyWindowFramebuffer(_this, window);
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65
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66 /* Create the graphics context for drawing */
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67 gcv.graphics_exposures = False;
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68 data->gc = XCreateGC(display, data->xwindow, GCGraphicsExposures, &gcv);
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69 if (!data->gc) {
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70 SDL_SetError("Couldn't create graphics context");
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71 return -1;
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72 }
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73
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74 /* Find out the pixel format and depth */
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75 if (X11_GetVisualInfoFromVisual(display, data->visual, &vinfo) < 0) {
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76 SDL_SetError("Couldn't get window visual information");
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77 return -1;
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78 }
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79
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80 *format = X11_GetPixelFormatFromVisualInfo(display, &vinfo);
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81 if (*format == SDL_PIXELFORMAT_UNKNOWN) {
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82 SDL_SetError("Unknown window pixel format");
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83 return -1;
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84 }
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85
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86 /* Calculate pitch */
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87 *pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
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88
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89 /* Create the actual image */
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90 #ifndef NO_SHARED_MEMORY
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91 if (have_mitshm()) {
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92 XShmSegmentInfo *shminfo = &data->shminfo;
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93
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94 shminfo->shmid = shmget(IPC_PRIVATE, window->h*(*pitch), IPC_CREAT | 0777);
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95 if ( shminfo->shmid >= 0 ) {
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96 shminfo->shmaddr = (char *)shmat(shminfo->shmid, 0, 0);
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97 shminfo->readOnly = False;
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98 if ( shminfo->shmaddr != (char *)-1 ) {
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99 shm_error = False;
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100 X_handler = XSetErrorHandler(shm_errhandler);
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101 XShmAttach(display, shminfo);
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102 XSync(display, True);
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103 XSetErrorHandler(X_handler);
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104 if ( shm_error )
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105 shmdt(shminfo->shmaddr);
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106 } else {
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107 shm_error = True;
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108 }
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109 shmctl(shminfo->shmid, IPC_RMID, NULL);
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110 } else {
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111 shm_error = True;
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112 }
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113 if (!shm_error) {
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114 data->ximage = XShmCreateImage(display, data->visual,
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115 vinfo.depth, ZPixmap,
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116 shminfo->shmaddr, shminfo,
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117 window->w, window->h);
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118 if (!data->ximage) {
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119 XShmDetach(display, shminfo);
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120 XSync(display, False);
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121 shmdt(shminfo->shmaddr);
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122 } else {
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123 /* Done! */
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124 data->use_mitshm = SDL_TRUE;
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125 *pixels = shminfo->shmaddr;
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126 return 0;
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127 }
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128 }
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129 }
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130 #endif /* not NO_SHARED_MEMORY */
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131
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132 *pixels = SDL_malloc(window->h*(*pitch));
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133 if (*pixels == NULL) {
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134 SDL_OutOfMemory();
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135 return -1;
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136 }
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137
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138 data->ximage = XCreateImage(display, data->visual,
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139 vinfo.depth, ZPixmap, 0, (char *)(*pixels),
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140 window->w, window->h, 32, 0);
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141 if (!data->ximage) {
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142 SDL_free(*pixels);
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143 SDL_SetError("Couldn't create XImage");
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144 return -1;
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145 }
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146 return 0;
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147 }
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148
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149 int
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150 X11_UpdateWindowFramebuffer(_THIS, SDL_Window * window,
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151 int numrects, SDL_Rect * rects)
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152 {
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153 SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
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154 Display *display = data->videodata->display;
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155 int i;
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156 SDL_Rect *rect;
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157
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158 #ifndef NO_SHARED_MEMORY
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159 if (data->use_mitshm) {
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160 for (i = 0; i < numrects; ++i) {
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161 rect = &rects[i];
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162
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163 if (rect->w == 0 || rect->h == 0) { /* Clipped? */
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164 continue;
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165 }
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166 XShmPutImage(display, data->xwindow, data->gc, data->ximage,
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167 rect->x, rect->y,
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168 rect->x, rect->y, rect->w, rect->h, False);
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169 }
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170 }
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171 else
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172 #endif /* !NO_SHARED_MEMORY */
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173 {
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174 for (i = 0; i < numrects; ++i) {
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175 rect = &rects[i];
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176
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177 if (rect->w == 0 || rect->h == 0) { /* Clipped? */
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178 continue;
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179 }
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180 XPutImage(display, data->xwindow, data->gc, data->ximage,
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181 rect->x, rect->y,
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182 rect->x, rect->y, rect->w, rect->h);
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183 }
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184 }
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185 XSync(display, False);
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186 }
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187
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188 void
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189 X11_DestroyWindowFramebuffer(_THIS, SDL_Window * window)
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190 {
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191 SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
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192 Display *display = data->videodata->display;
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193
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194 if (data->ximage) {
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195 XDestroyImage(data->ximage);
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196
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197 #ifndef NO_SHARED_MEMORY
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198 if (data->use_mitshm) {
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199 XShmDetach(display, &data->shminfo);
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200 XSync(display, False);
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201 shmdt(data->shminfo.shmaddr);
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202 data->use_mitshm = SDL_FALSE;
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203 }
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204 #endif /* !NO_SHARED_MEMORY */
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205
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206 data->ximage = NULL;
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207 }
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208 if (data->gc) {
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209 XFreeGC(display, data->gc);
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210 data->gc = NULL;
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211 }
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212 }
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213
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214 /* vi: set ts=4 sw=4 expandtab: */