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Text File  |  1997-05-20  |  2KB  |  74 lines
  1.  
  2. void x24_make_page(short width, short height, unsigned char *page_buffer)
  3. {
  4.   XImage_Info *xi;  
  5.   if (special && !special->static_mem)
  6.   {
  7.     xi=new XImage_Info;
  8.     special->extended_descriptor=(void *)xi;    
  9. #ifndef NO_SHM
  10.     if (doShm)
  11.     {
  12.       width=(width+3)&(0xffffffff-3);
  13.       // create the image
  14.       xi->XImg = XShmCreateImage(display,
  15.                  X_visual,
  16.                  24,
  17.                  ZPixmap,
  18.                  0,
  19.                  &xi->X_shminfo,
  20.                  width,
  21.                  height );
  22.  
  23.       w=width=xi->XImg->bytes_per_line;  // adjust image size to X requirments
  24.       
  25.       // create the shared memory segment
  26.       xi->X_shminfo.shmid = shmget (IPC_PRIVATE, width*height*3, IPC_CREAT | 0777);
  27.       ERROR(xi->X_shminfo.shmid>=0,"shmget() failed, go figure");
  28.  
  29.       xi->X_shminfo.readOnly=False;
  30.       
  31.  
  32.       // attach to the shared memory segment to us
  33.       xi->XImg->data = xi->X_shminfo.shmaddr =
  34.         (char *) shmat(xi->X_shminfo.shmid, 0, 0);
  35.       ERROR(xi->XImg->data,"shmat() failed, go figure");
  36.  
  37.       if (page_buffer)
  38.         memcpy(xi->XImg->data,page_buffer,width*height);           
  39.  
  40.       // get the X server to attach to it to the X server
  41.       ERROR(XShmAttach(display, &xi->X_shminfo),"XShmAttach() failed, go figure");
  42.       XSync(display,False); // make sure segment gets attached
  43.       ERROR(shmctl(xi->X_shminfo.shmid,IPC_RMID,NULL)==0,"shmctl failed, why?"); 
  44.  
  45.     } else 
  46. #endif
  47.     {
  48.       if (!page_buffer)
  49.         page_buffer=(unsigned char *)jmalloc(width*height,"image::data");
  50.       
  51.       xi->XImg = XCreateImage(    display,
  52.                     X_visual,
  53.                     8, // my_visual->depth,
  54.                     ZPixmap,
  55.                     0,
  56.                     (char *)page_buffer,
  57.                     width, height,
  58.                     8,
  59.                     width );
  60.       ERROR(xi->XImg,"XCreateImage failed");
  61.     }
  62.     data=(unsigned char *) (xi->XImg->data);        
  63.   }
  64.   else 
  65.   {
  66.     if (!page_buffer)
  67.       data=(unsigned char *)jmalloc(width*height,"image::data");
  68.     else data=page_buffer;
  69.   }
  70.  
  71.   if (special)
  72.     special->resize(width,height);
  73. }
  74.