guacamole-spice-protocol/src/protocols/rdp/resolution.c

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/*
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* 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
*
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* http://www.apache.org/licenses/LICENSE-2.0
*
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* 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 "client.h"
#include "resolution.h"
#include <guacamole/user.h>
int guac_rdp_resolution_reasonable(guac_user* user, int resolution) {
int width = user->info.optimal_width;
int height = user->info.optimal_height;
/* Convert user pixels to remote pixels */
width = width * resolution / user->info.optimal_resolution;
height = height * resolution / user->info.optimal_resolution;
/*
* Resolution is reasonable if the same as the user optimal resolution
* OR if the resulting display area is reasonable
*/
return user->info.optimal_resolution == resolution
|| width*height >= GUAC_RDP_REASONABLE_AREA;
}
int guac_rdp_suggest_resolution(guac_user* user) {
/* Prefer RDP's native resolution */
if (guac_rdp_resolution_reasonable(user, GUAC_RDP_NATIVE_RESOLUTION))
return GUAC_RDP_NATIVE_RESOLUTION;
/* If native resolution is too tiny, try higher resolution */
if (guac_rdp_resolution_reasonable(user, GUAC_RDP_HIGH_RESOLUTION))
return GUAC_RDP_HIGH_RESOLUTION;
/* Fallback to user-suggested resolution */
return user->info.optimal_resolution;
}