guacamole-spice-protocol/src/guacenc/display-layers.c
2016-03-28 20:39:19 -07:00

100 lines
2.8 KiB
C

/*
* 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 "layer.h"
#include "log.h"
#include <guacamole/client.h>
#include <stdlib.h>
guacenc_layer* guacenc_display_get_layer(guacenc_display* display,
int index) {
/* Do not lookup / allocate if index is invalid */
if (index < 0 || index >= GUACENC_DISPLAY_MAX_LAYERS) {
guacenc_log(GUAC_LOG_WARNING, "Layer index out of bounds: %i", index);
return NULL;
}
/* Lookup layer, allocating a new layer if necessary */
guacenc_layer* layer = display->layers[index];
if (layer == NULL) {
/* Attempt to allocate layer */
layer = guacenc_layer_alloc();
if (layer == NULL) {
guacenc_log(GUAC_LOG_WARNING, "Layer allocation failed");
return NULL;
}
/* The default layer has no parent */
if (index == 0)
layer->parent_index = GUACENC_LAYER_NO_PARENT;
/* Store layer within display for future retrieval / management */
display->layers[index] = layer;
}
return layer;
}
int guacenc_display_get_depth(guacenc_display* display, guacenc_layer* layer) {
/* Non-existent layers have a depth of 0 */
if (layer == NULL)
return 0;
/* Layers with no parent have a depth of 0 */
if (layer->parent_index == GUACENC_LAYER_NO_PARENT)
return 0;
/* Retrieve parent layer */
guacenc_layer* parent =
guacenc_display_get_layer(display, layer->parent_index);
/* Current layer depth is the depth of the parent + 1 */
return guacenc_display_get_depth(display, parent) + 1;
}
int guacenc_display_free_layer(guacenc_display* display,
int index) {
/* Do not lookup / free if index is invalid */
if (index < 0 || index >= GUACENC_DISPLAY_MAX_LAYERS) {
guacenc_log(GUAC_LOG_WARNING, "Layer index out of bounds: %i", index);
return 1;
}
/* Free layer (if allocated) */
guacenc_layer_free(display->layers[index]);
/* Mark layer as freed */
display->layers[index] = NULL;
return 0;
}