image.c

   1 /*
   2  * image.c
   3  *
   4  * Part of gwm, the Gratuitous Window Manager,
   5  *     by Gary Wong, <gtw@gnu.org>.
   6  *
   7  * Copyright (C) 2009  Gary Wong
   8  *
   9  *  This program is free software: you can redistribute it and/or modify
  10  *  it under the terms of version 3 of the GNU General Public License as
  11  *  published by the Free Software Foundation.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  *
  21  * $Id$
  22  */
  23
  24 #include <config.h>
  25
  26 #include <xcb/xcb.h>
  27
  28 #include "gwm.h"
  29
  30 #include "image.h"
  31
  32 extern xcb_void_cookie_t put_image( xcb_drawable_t drawable, xcb_gcontext_t gc,
  33                                     uint16_t width, uint16_t height, int16_t x,
  34                                     int16_t y, uint8_t left_pad, uint8_t depth,
  35                                     uint32_t len, const uint8_t *data ) {
  36
  37     static uint16_t max;
  38
  39     if( !max )
  40         max = xcb_get_setup( c )->maximum_request_length << 2;
  41
  42     if( len + sizeof (xcb_put_image_request_t ) < max )
  43         return xcb_put_image( c, XCB_IMAGE_FORMAT_Z_PIXMAP, drawable,
  44                               gc, width, height, x, y, left_pad,
  45                               depth, len, data );
  46     else {
  47         int linesize = len / height;
  48         int lines = ( max - sizeof (xcb_put_image_request_t) ) / linesize;
  49
  50         while( height > lines ) {
  51             xcb_put_image( c, XCB_IMAGE_FORMAT_Z_PIXMAP, drawable,
  52                            gc, width, lines, x, y, left_pad,
  53                            depth, lines * linesize, data );
  54             y += lines;
  55             height -= lines;
  56             len -= lines * linesize;
  57             data += lines * linesize;
  58         }
  59
  60         return xcb_put_image( c, XCB_IMAGE_FORMAT_Z_PIXMAP, drawable,
  61                               gc, width, height, x, y, left_pad,
  62                               depth, len, data );
  63     }
  64 }