text: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  #include "config.h"
  #include "display.h"
  #include "log.h"
  
  #include <guacamole/client.h>
  
  #include <stdlib.h>
  
  int guacenc_handle_copy(guacenc_display* display, int argc, char** argv) {
  
      /* Verify argument count */
      if (argc < 9) {
          guacenc_log(GUAC_LOG_WARNING, "\"copy\" instruction incomplete");
          return 1;
      }
  
      /* Parse arguments */
      int sindex = atoi(argv[0]);
      int sx = atoi(argv[1]);
      int sy = atoi(argv[2]);
      int width = atoi(argv[3]);
      int height = atoi(argv[4]);
      int mask = atoi(argv[5]);
      int dindex = atoi(argv[6]);
      int dx = atoi(argv[7]);
      int dy = atoi(argv[8]);
  
      /* Pull buffer of source layer/buffer */
      guacenc_buffer* src = guacenc_display_get_related_buffer(display, sindex);
      if (src == NULL)
          return 1;
  
      /* Pull buffer of destination layer/buffer */
      guacenc_buffer* dst = guacenc_display_get_related_buffer(display, dindex);
      if (dst == NULL)
          return 1;
  
      /* Expand the destination buffer as necessary to fit the draw operation */
      if (dst->autosize)
          guacenc_buffer_fit(dst, dx + width, dy + height);
  
      /* Copy rectangle from source to destination */
      if (src->surface != NULL && dst->cairo != NULL) {
  
          /* If surfaces are different, no need to copy */
          cairo_surface_t* surface;
          if (src != dst)
              surface = src->surface;
  
          /* Otherwise, copy to a temporary surface */
          else {
  
              /* Create new surface to hold the source rect */
              surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
                      width, height);
  
              /* Copy relevant rectangle from source surface */
              cairo_t* cairo = cairo_create(surface);
              cairo_set_operator(cairo, CAIRO_OPERATOR_SOURCE);
              cairo_set_source_surface(cairo, src->surface, -sx, -sy);
              cairo_paint(cairo);
              cairo_destroy(cairo);
  
              /* Source coordinates are now (0, 0) */
              sx = sy = 0;
  
          }
  
          /* Perform copy */
          cairo_set_operator(dst->cairo, guacenc_display_cairo_operator(mask));
          cairo_set_source_surface(dst->cairo, surface, dx - sx, dy - sy);
          cairo_rectangle(dst->cairo, dx, dy, width, height);
          cairo_fill(dst->cairo);
  
          /* Destroy temporary surface if it was created */
          if (surface != src->surface)
              cairo_surface_destroy(surface);
  
      }
  
      return 0;
  
  }
  
  