src/cairo-xcb-connection-core.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 #include "cairo-xcb-private.h"
  35
  36 #include <xcb/xcbext.h>
  37
  38 xcb_pixmap_t
  39 _cairo_xcb_connection_create_pixmap (cairo_xcb_connection_t *connection,
  40                                      uint8_t depth,
  41                                      xcb_drawable_t drawable,
  42                                      uint16_t width,
  43                                      uint16_t height)
  44 {
  45     xcb_pixmap_t pixmap = _cairo_xcb_connection_get_xid (connection);
  46
  47     assert (width > 0);
  48     assert (height > 0);
  49     xcb_create_pixmap (connection->xcb_connection,
  50                        depth, pixmap, drawable,
  51                        width, height);
  52     return pixmap;
  53 }
  54
  55 void
  56 _cairo_xcb_connection_free_pixmap (cairo_xcb_connection_t *connection,
  57                                    xcb_pixmap_t pixmap)
  58 {
  59     xcb_free_pixmap (connection->xcb_connection, pixmap);
  60     _cairo_xcb_connection_put_xid (connection, pixmap);
  61 }
  62
  63 xcb_gcontext_t
  64 _cairo_xcb_connection_create_gc (cairo_xcb_connection_t *connection,
  65                                  xcb_drawable_t drawable,
  66                                  uint32_t value_mask,
  67                                  uint32_t *values)
  68 {
  69     xcb_gcontext_t gc = _cairo_xcb_connection_get_xid (connection);
  70     xcb_create_gc (connection->xcb_connection, gc, drawable,
  71                    value_mask, values);
  72     return gc;
  73 }
  74
  75 void
  76 _cairo_xcb_connection_free_gc (cairo_xcb_connection_t *connection,
  77                                xcb_gcontext_t gc)
  78 {
  79     xcb_free_gc (connection->xcb_connection, gc);
  80     _cairo_xcb_connection_put_xid (connection, gc);
  81 }
  82
  83 void
  84 _cairo_xcb_connection_change_gc (cairo_xcb_connection_t *connection,
  85                                  xcb_gcontext_t gc,
  86                                  uint32_t value_mask,
  87                                  uint32_t *values)
  88 {
  89     xcb_change_gc (connection->xcb_connection, gc,
  90                    value_mask, values);
  91 }
  92
  93 void
  94 _cairo_xcb_connection_copy_area (cairo_xcb_connection_t *connection,
  95                                  xcb_drawable_t src,
  96                                  xcb_drawable_t dst,
  97                                  xcb_gcontext_t gc,
  98                                  int16_t src_x,
  99                                  int16_t src_y,
 100                                  int16_t dst_x,
 101                                  int16_t dst_y,
 102                                  uint16_t width,
 103                                  uint16_t height)
 104 {
 105     xcb_copy_area (connection->xcb_connection, src, dst, gc,
 106                    src_x, src_y, dst_x, dst_y, width, height);
 107 }
 108
 109 void
 110 _cairo_xcb_connection_poly_fill_rectangle (cairo_xcb_connection_t *connection,
 111                                            xcb_drawable_t dst,
 112                                            xcb_gcontext_t gc,
 113                                            uint32_t num_rectangles,
 114                                            xcb_rectangle_t *rectangles)
 115 {
 116     xcb_poly_fill_rectangle (connection->xcb_connection, dst, gc,
 117                              num_rectangles, rectangles);
 118 }
 119
 120 void
 121 _cairo_xcb_connection_put_image (cairo_xcb_connection_t *connection,
 122                                  xcb_drawable_t dst,
 123                                  xcb_gcontext_t gc,
 124                                  uint16_t width,
 125                                  uint16_t height,
 126                                  int16_t dst_x,
 127                                  int16_t dst_y,
 128                                  uint8_t depth,
 129                                  uint32_t stride,
 130                                  void *data)
 131 {
 132     const uint32_t req_size = 18;
 133     uint32_t length = height * stride;
 134     uint32_t len = (req_size + length) >> 2;
 135
 136     if (len < connection->maximum_request_length) {
 137         xcb_put_image (connection->xcb_connection, XCB_IMAGE_FORMAT_Z_PIXMAP,
 138                        dst, gc, width, height, dst_x, dst_y, 0, depth,
 139                        length, data);
 140     } else {
 141         int rows = (connection->maximum_request_length - req_size - 4) / stride;
 142         if (rows > 0) {
 143             do {
 144                 if (rows > height)
 145                     rows = height;
 146
 147                 length = rows * stride;
 148
 149                 xcb_put_image (connection->xcb_connection, XCB_IMAGE_FORMAT_Z_PIXMAP,
 150                                dst, gc, width, rows, dst_x, dst_y, 0, depth, length, data);
 151
 152                 height -= rows;
 153                 dst_y += rows;
 154                 data = (char *) data + length;
 155             } while (height);
 156         } else {
 157             ASSERT_NOT_REACHED;
 158         }
 159     }
 160 }
 161
 162 void
 163 _cairo_xcb_connection_put_subimage (cairo_xcb_connection_t *connection,
 164                                     xcb_drawable_t dst,
 165                                     xcb_gcontext_t gc,
 166                                     int16_t src_x,
 167                                     int16_t src_y,
 168                                     uint16_t width,
 169                                     uint16_t height,
 170                                     uint16_t cpp,
 171                                     int stride,
 172                                     int16_t dst_x,
 173                                     int16_t dst_y,
 174                                     uint8_t depth,
 175                                     void *_data)
 176 {
 177     xcb_protocol_request_t xcb_req = {
 178         0 /* count */,
 179         0 /* ext */,
 180         XCB_PUT_IMAGE /* opcode */,
 181         1 /* isvoid (doesn't cause a reply) */
 182     };
 183     xcb_put_image_request_t req;
 184     struct iovec vec_stack[CAIRO_STACK_ARRAY_LENGTH (struct iovec)];
 185     struct iovec *vec = vec_stack;
 186     uint32_t len = 0;
 187     uint8_t *data = _data;
 188     int n = 3;
 189     /* Two extra entries are needed for xcb, two for us */
 190     int entries_needed = height + 2 + 2;
 191
 192     req.format = XCB_IMAGE_FORMAT_Z_PIXMAP;
 193     req.drawable = dst;
 194     req.gc = gc;
 195     req.width = width;
 196     req.height = height;
 197     req.dst_x = dst_x;
 198     req.dst_y = dst_y;
 199     req.left_pad = 0;
 200     req.depth = depth;
 201     req.pad0[0] = 0;
 202     req.pad0[1] = 0;
 203
 204     if (entries_needed > ARRAY_LENGTH (vec_stack)) {
 205         vec = _cairo_malloc_ab (entries_needed, sizeof (struct iovec));
 206         if (unlikely (vec == NULL)) {
 207             /* XXX loop over ARRAY_LENGTH (vec_stack) */
 208             return;
 209         }
 210     }
 211
 212     data += src_y * stride + src_x * cpp;
 213     /* vec[1] will be used in XCB if it has to use BigRequests or insert a sync,
 214      * vec[0] is used if the internal queue needs to be flushed. */
 215     vec[2].iov_base = (char *) &req;
 216     vec[2].iov_len = sizeof (req);
 217
 218     /* Now comes the actual data */
 219     while (height--) {
 220         vec[n].iov_base = data;
 221         vec[n].iov_len = cpp * width;
 222         len += cpp * width;
 223         data += stride;
 224         n++;
 225     }
 226
 227     /* And again some padding */
 228     vec[n].iov_base = 0;
 229     vec[n].iov_len = -len & 3;
 230     n++;
 231
 232     /* For efficiency reasons, this functions writes the request "directly" to
 233      * the xcb connection to avoid having to copy the data around. */
 234     assert (n == entries_needed);
 235     xcb_req.count = n - 2;
 236     xcb_send_request (connection->xcb_connection, 0, &vec[2], &xcb_req);
 237
 238     if (vec != vec_stack)
 239         free (vec);
 240 }
 241
 242 cairo_status_t
 243 _cairo_xcb_connection_get_image (cairo_xcb_connection_t *connection,
 244                                  xcb_drawable_t src,
 245                                  int16_t src_x,
 246                                  int16_t src_y,
 247                                  uint16_t width,
 248                                  uint16_t height,
 249                                  xcb_get_image_reply_t **reply)
 250 {
 251     xcb_generic_error_t *error;
 252
 253     *reply = xcb_get_image_reply (connection->xcb_connection,
 254                                   xcb_get_image (connection->xcb_connection,
 255                                                  XCB_IMAGE_FORMAT_Z_PIXMAP,
 256                                                  src,
 257                                                  src_x, src_y,
 258                                                  width, height,
 259                                                  (uint32_t) -1),
 260
 261                                   &error);
 262     if (error) {
 263         free (error);
 264
 265         free (*reply);
 266         *reply = NULL;
 267     }
 268
 269     return CAIRO_STATUS_SUCCESS;
 270 }