This patch fixes an inability to GRAB or display XWD files on the eXceed
X server running in 24-bits.  It may also fix GRAB problems on other X 
servers.  It shouldn't *break* anything, and as such, can and should be
applied by everybody.

The bits_per_item of the returned XImage is less than bits_per_pixel, which
is wrong, as far as I can tell.  (Hard to really know, as the X11 docs aren't
at *all* clear on the subject.)  I do know that it breaks my code, and the netpbm
code, and god only knows what else.

Maybe they're wrong, maybe I'm wrong - who knows.  In any event, this patch 
fixes it, as far as XV is concerned.

Thanks to Nadim Saeed (nadim@xlnt.com)!

--jhb



*** xvgrab.c.orig	Thu Oct  7 10:41:15 1999
--- xvgrab.c	Thu Oct  7 12:03:36 1999
***************
*** 641,648 ****
  
  
    bits_per_item = image->bitmap_unit;
-   bits_used = bits_per_item;
    bits_per_pixel = image->bits_per_pixel;
  
    if (bits_per_pixel == 32) pixmask = 0xffffffff;
    else pixmask = (((CARD32) 1) << bits_per_pixel) - 1;
--- 641,667 ----
  
  
    bits_per_item = image->bitmap_unit;
    bits_per_pixel = image->bits_per_pixel;
+ 
+ 
+   /* add code for freako 'exceed' server, where bitmapunit = 8
+      and bitsperpix = 32 (and depth=24)... */
+ 
+   if (bits_per_item < bits_per_pixel) {
+     bits_per_item = bits_per_pixel;
+   
+     /* round bits_per_item up to next legal value, if necc */
+     if      (bits_per_item <  8) bits_per_item = 8;
+     else if (bits_per_item < 16) bits_per_item = 16;
+     else                         bits_per_item = 32;
+   }
+ 
+ 
+   /* which raises the question:  how (can?) you ever have a 24 bits per pix,
+      (ie, 3 bytes, no alpha/padding) */
+ 
+ 
+   bits_used = bits_per_item;  /* so it will get a new item first time */
  
    if (bits_per_pixel == 32) pixmask = 0xffffffff;
    else pixmask = (((CARD32) 1) << bits_per_pixel) - 1;



*** xvxwd.c.orig	Thu Oct  7 12:13:09 1999
--- xvxwd.c	Thu Oct  7 12:13:13 1999
***************
*** 396,406 ****
      h11P->pixmap_width;
    
    bits_per_item  = h11P->bitmap_unit;
-   bits_used      = bits_per_item;
    bits_per_pixel = h11P->bits_per_pixel;
    byte_order     = h11P->byte_order;
    bit_order      = h11P->bitmap_bit_order;
    
    if (bits_per_pixel == sizeof(pixel_mask) * 8)  pixel_mask = (CARD32) -1;
    else pixel_mask = (1 << bits_per_pixel) - 1;
    
--- 396,425 ----
      h11P->pixmap_width;
    
    bits_per_item  = h11P->bitmap_unit;
    bits_per_pixel = h11P->bits_per_pixel;
    byte_order     = h11P->byte_order;
    bit_order      = h11P->bitmap_bit_order;
    
+  
+   /* add sanity-code for freako 'exceed' server, where bitmapunit = 8
+      and bitsperpix = 32 (and depth=24)... */
+  
+   if (bits_per_item < bits_per_pixel) {
+     bits_per_item = bits_per_pixel;
+    
+     /* round bits_per_item up to next legal value, if necc */
+     if      (bits_per_item <  8) bits_per_item = 8;
+     else if (bits_per_item < 16) bits_per_item = 16;
+     else                         bits_per_item = 32;
+   }
+  
+  
+   /* which raises the question:  how (can?) you ever have a 24 bits per pix,
+      (ie, 3 bytes, no alpha/padding) */
+  
+  
+   bits_used      = bits_per_item;
+ 
    if (bits_per_pixel == sizeof(pixel_mask) * 8)  pixel_mask = (CARD32) -1;
    else pixel_mask = (1 << bits_per_pixel) - 1;