wrlib/xutil.c

   1 /* xutil.c - utility functions for X
   2  *
   3  * Raster graphics library
   4  *
   5  * Copyright (c) 1997-2003 Alfredo K. Kojima
   6  *
   7  *  This library is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU Library General Public
   9  *  License as published by the Free Software Foundation; either
  10  *  version 2 of the License, or (at your option) any later version.
  11  *
  12  *  This library is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  Library General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU Library General Public
  18  *  License along with this library; if not, write to the Free
  19  *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <config.h>
  23
  24 #include <X11/Xlib.h>
  25 #include <X11/Xutil.h>
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29
  30 #include <assert.h>
  31
  32 #ifdef XSHM
  33 #include <sys/ipc.h>
  34 #include <sys/shm.h>
  35 #endif                          /* XSHM */
  36
  37 #include "wraster.h"
  38
  39 #ifdef XSHM
  40
  41 static int shmError;
  42
  43 static int (*oldErrorHandler) ();
  44
  45 static int errorHandler(Display * dpy, XErrorEvent * err)
  46 {
  47         shmError = 1;
  48         if (err->error_code != BadAccess)
  49                 (*oldErrorHandler) (dpy, err);
  50
  51         return 0;
  52 }
  53
  54 #endif
  55
  56 RXImage *RCreateXImage(RContext * context, int depth, unsigned width, unsigned height)
  57 {
  58         RXImage *rximg;
  59         Visual *visual = context->visual;
  60
  61         rximg = malloc(sizeof(RXImage));
  62         if (!rximg) {
  63                 RErrorCode = RERR_NOMEMORY;
  64                 return NULL;
  65         }
  66 #ifndef XSHM
  67         rximg->image = XCreateImage(context->dpy, visual, depth, ZPixmap, 0, NULL, width, height, 8, 0);
  68         if (!rximg->image) {
  69                 free(rximg);
  70                 RErrorCode = RERR_XERROR;
  71                 return NULL;
  72         }
  73         rximg->image->data = malloc(rximg->image->bytes_per_line * height);
  74         if (!rximg->image->data) {
  75                 XDestroyImage(rximg->image);
  76                 free(rximg);
  77                 RErrorCode = RERR_NOMEMORY;
  78                 return NULL;
  79         }
  80 #else                           /* XSHM */
  81         if (!context->attribs->use_shared_memory) {
  82  retry_without_shm:
  83
  84                 context->attribs->use_shared_memory = 0;
  85                 rximg->is_shared = 0;
  86                 rximg->image = XCreateImage(context->dpy, visual, depth, ZPixmap, 0, NULL, width, height, 8, 0);
  87                 if (!rximg->image) {
  88                         free(rximg);
  89                         RErrorCode = RERR_XERROR;
  90                         return NULL;
  91                 }
  92                 rximg->image->data = malloc(rximg->image->bytes_per_line * height);
  93                 if (!rximg->image->data) {
  94                         XDestroyImage(rximg->image);
  95                         free(rximg);
  96                         RErrorCode = RERR_NOMEMORY;
  97                         return NULL;
  98                 }
  99         } else {
 100                 rximg->is_shared = 1;
 101
 102                 rximg->info.readOnly = False;
 103
 104                 rximg->image = XShmCreateImage(context->dpy, visual, depth,
 105                                                ZPixmap, NULL, &rximg->info, width, height);
 106
 107                 rximg->info.shmid = shmget(IPC_PRIVATE, rximg->image->bytes_per_line * height, IPC_CREAT | 0777);
 108                 if (rximg->info.shmid < 0) {
 109                         context->attribs->use_shared_memory = 0;
 110                         perror("wrlib: could not allocate shared memory segment");
 111                         XDestroyImage(rximg->image);
 112                         goto retry_without_shm;
 113                 }
 114
 115                 rximg->info.shmaddr = shmat(rximg->info.shmid, 0, 0);
 116                 if (rximg->info.shmaddr == (void *)-1) {
 117                         context->attribs->use_shared_memory = 0;
 118                         if (shmctl(rximg->info.shmid, IPC_RMID, 0) < 0)
 119                                 perror("wrlib: shmctl");
 120                         perror("wrlib: could not allocate shared memory");
 121                         XDestroyImage(rximg->image);
 122                         goto retry_without_shm;
 123                 }
 124
 125                 shmError = 0;
 126                 XSync(context->dpy, False);
 127                 oldErrorHandler = XSetErrorHandler(errorHandler);
 128                 XShmAttach(context->dpy, &rximg->info);
 129                 XSync(context->dpy, False);
 130                 XSetErrorHandler(oldErrorHandler);
 131
 132                 rximg->image->data = rximg->info.shmaddr;
 133                 /*      rximg->image->obdata = &(rximg->info); */
 134
 135                 if (shmError) {
 136                         context->attribs->use_shared_memory = 0;
 137                         XDestroyImage(rximg->image);
 138                         if (shmdt(rximg->info.shmaddr) < 0)
 139                                 perror("wrlib: shmdt");
 140                         if (shmctl(rximg->info.shmid, IPC_RMID, 0) < 0)
 141                                 perror("wrlib: shmctl");
 142                         /*      printf("wrlib:error attaching shared memory segment to XImage\n");
 143                          */
 144                         goto retry_without_shm;
 145                 }
 146         }
 147 #endif                          /* XSHM */
 148
 149         return rximg;
 150 }
 151
 152 void RDestroyXImage(RContext * context, RXImage * rximage)
 153 {
 154 #ifndef XSHM
 155         XDestroyImage(rximage->image);
 156 #else                           /* XSHM */
 157         if (rximage->is_shared) {
 158                 XSync(context->dpy, False);
 159                 XShmDetach(context->dpy, &rximage->info);
 160                 XDestroyImage(rximage->image);
 161                 if (shmdt(rximage->info.shmaddr) < 0)
 162                         perror("wrlib: shmdt");
 163                 if (shmctl(rximage->info.shmid, IPC_RMID, 0) < 0)
 164                         perror("wrlib: shmctl");
 165         } else {
 166                 XDestroyImage(rximage->image);
 167         }
 168 #endif
 169         free(rximage);
 170 }
 171
 172 static unsigned getDepth(Display * dpy, Drawable d)
 173 {
 174         Window w;
 175         int foo;
 176         unsigned bar;
 177         unsigned depth;
 178
 179         XGetGeometry(dpy, d, &w, &foo, &foo, &bar, &bar, &bar, &depth);
 180
 181         return depth;
 182 }
 183
 184 RXImage *RGetXImage(RContext * context, Drawable d, int x, int y, unsigned width, unsigned height)
 185 {
 186         RXImage *ximg = NULL;
 187
 188 #ifdef XSHM
 189         if (context->attribs->use_shared_memory && 0) {
 190                 ximg = RCreateXImage(context, getDepth(context->dpy, d), width, height);
 191
 192                 if (ximg && !ximg->is_shared) {
 193                         RDestroyXImage(context, ximg);
 194                         ximg = NULL;
 195                 }
 196                 if (ximg) {
 197                         XShmGetImage(context->dpy, d, ximg->image, x, y, AllPlanes);
 198                 }
 199         }
 200         if (!ximg) {
 201                 ximg = malloc(sizeof(RXImage));
 202                 if (!ximg) {
 203                         RErrorCode = RERR_NOMEMORY;
 204                         return NULL;
 205                 }
 206                 ximg->is_shared = 0;
 207                 ximg->image = XGetImage(context->dpy, d, x, y, width, height, AllPlanes, ZPixmap);
 208         }
 209         return ximg;
 210 #else                           /* !XSHM */
 211         ximg = malloc(sizeof(RXImage));
 212         if (!ximg) {
 213                 RErrorCode = RERR_NOMEMORY;
 214                 return NULL;
 215         }
 216
 217         ximg->image = XGetImage(context->dpy, d, x, y, width, height, AllPlanes, ZPixmap);
 218
 219         return ximg;
 220 #endif                          /* !XSHM */
 221 }
 222
 223 void
 224 RPutXImage(RContext * context, Drawable d, GC gc, RXImage * ximage, int src_x,
 225            int src_y, int dest_x, int dest_y, unsigned int width, unsigned int height)
 226 {
 227 #ifndef XSHM
 228         XPutImage(context->dpy, d, gc, ximage->image, src_x, src_y, dest_x, dest_y, width, height);
 229 #else
 230         if (ximage->is_shared) {
 231                 XShmPutImage(context->dpy, d, gc, ximage->image, src_x, src_y,
 232                              dest_x, dest_y, width, height, False);
 233         } else {
 234                 XPutImage(context->dpy, d, gc, ximage->image, src_x, src_y, dest_x, dest_y, width, height);
 235         }
 236         XFlush(context->dpy);
 237 #endif                          /* XSHM */
 238 }
 239
 240 #ifdef XSHM
 241 Pixmap R_CreateXImageMappedPixmap(RContext * context, RXImage * rximage)
 242 {
 243         Pixmap pix;
 244
 245         pix = XShmCreatePixmap(context->dpy, context->drawable,
 246                                rximage->image->data, &rximage->info,
 247                                rximage->image->width, rximage->image->height, rximage->image->depth);
 248
 249         return pix;
 250 }
 251
 252 #endif                          /* XSHM */