src/cairo-xcb-connection-shm.c

   1 /* cairo - a vector graphics library with display and print output
   2  *
   3  * Copyright © 2009 Intel Corporation
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it either under the terms of the GNU Lesser General Public
   7  * License version 2.1 as published by the Free Software Foundation
   8  * (the "LGPL") or, at your option, under the terms of the Mozilla
   9  * Public License Version 1.1 (the "MPL"). If you do not alter this
  10  * notice, a recipient may use your version of this file under either
  11  * the MPL or the LGPL.
  12  *
  13  * You should have received a copy of the LGPL along with this library
  14  * in the file COPYING-LGPL-2.1; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
  16  * You should have received a copy of the MPL along with this library
  17  * in the file COPYING-MPL-1.1
  18  *
  19  * The contents of this file are subject to the Mozilla Public License
  20  * Version 1.1 (the "License"); you may not use this file except in
  21  * compliance with the License. You may obtain a copy of the License at
  22  * http://www.mozilla.org/MPL/
  23  *
  24  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
  25  * OF ANY KIND, either express or implied. See the LGPL or the MPL for
  26  * the specific language governing rights and limitations.
  27  *
  28  * Contributor(s):
  29  *      Chris Wilson <chris@chris-wilson.co.uk>
  30  */
  31
  32 #include "cairoint.h"
  33
  34 #if CAIRO_HAS_XCB_SHM_FUNCTIONS
  35
  36 #include "cairo-xcb-private.h"
  37
  38 #include <xcb/xcbext.h>
  39 #include <xcb/shm.h>
  40
  41 uint32_t
  42 _cairo_xcb_connection_shm_attach (cairo_xcb_connection_t *connection,
  43                                   uint32_t id,
  44                                   cairo_bool_t readonly)
  45 {
  46     uint32_t segment = _cairo_xcb_connection_get_xid (connection);
  47     assert (connection->flags & CAIRO_XCB_HAS_SHM);
  48     xcb_shm_attach (connection->xcb_connection, segment, id, readonly);
  49     return segment;
  50 }
  51
  52 void
  53 _cairo_xcb_connection_shm_put_image (cairo_xcb_connection_t *connection,
  54                                      xcb_drawable_t dst,
  55                                      xcb_gcontext_t gc,
  56                                      uint16_t total_width,
  57                                      uint16_t total_height,
  58                                      int16_t src_x,
  59                                      int16_t src_y,
  60                                      uint16_t width,
  61                                      uint16_t height,
  62                                      int16_t dst_x,
  63                                      int16_t dst_y,
  64                                      uint8_t depth,
  65                                      uint32_t shm,
  66                                      uint32_t offset)
  67 {
  68     assert (connection->flags & CAIRO_XCB_HAS_SHM);
  69     xcb_shm_put_image (connection->xcb_connection, dst, gc, total_width, total_height,
  70                        src_x, src_y, width, height, dst_x, dst_y, depth,
  71                        XCB_IMAGE_FORMAT_Z_PIXMAP, 0, shm, offset);
  72 }
  73
  74 cairo_status_t
  75 _cairo_xcb_connection_shm_get_image (cairo_xcb_connection_t *connection,
  76                                      xcb_drawable_t src,
  77                                      int16_t src_x,
  78                                      int16_t src_y,
  79                                      uint16_t width,
  80                                      uint16_t height,
  81                                      uint32_t shmseg,
  82                                      uint32_t offset)
  83 {
  84     xcb_shm_get_image_reply_t *reply;
  85     xcb_generic_error_t *error;
  86
  87     assert (connection->flags & CAIRO_XCB_HAS_SHM);
  88     reply = xcb_shm_get_image_reply (connection->xcb_connection,
  89                                      xcb_shm_get_image (connection->xcb_connection,
  90                                                         src,
  91                                                         src_x, src_y,
  92                                                         width, height,
  93                                                         (uint32_t) -1,
  94                                                         XCB_IMAGE_FORMAT_Z_PIXMAP,
  95                                                         shmseg, offset),
  96                                      &error);
  97     free (reply);
  98
  99     if (error) {
 100         /* an error here should be impossible */
 101         free (error);
 102         return _cairo_error (CAIRO_STATUS_READ_ERROR);
 103     }
 104
 105     return CAIRO_STATUS_SUCCESS;
 106 }
 107
 108 void
 109 _cairo_xcb_connection_shm_detach (cairo_xcb_connection_t *connection,
 110                                   uint32_t segment)
 111 {
 112     assert (connection->flags & CAIRO_XCB_HAS_SHM);
 113     xcb_shm_detach (connection->xcb_connection, segment);
 114     _cairo_xcb_connection_put_xid (connection, segment);
 115 }
 116
 117 #endif /* CAIRO_HAS_XCB_SHM_FUNCTIONS */