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/*
* Copyright 2025 The Android Open Source Project
*
* Licensed 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.
*/
#define LOG_TAG "DisplayTopologyValidator"
#include <android-base/logging.h>
#include <ftl/enum.h>
#include <input/DisplayTopologyGraph.h>
#include <ui/LogicalDisplayId.h>
#include <algorithm>
namespace android {
namespace {
DisplayTopologyPosition getOppositePosition(DisplayTopologyPosition position) {
switch (position) {
case DisplayTopologyPosition::LEFT:
return DisplayTopologyPosition::RIGHT;
case DisplayTopologyPosition::TOP:
return DisplayTopologyPosition::BOTTOM;
case DisplayTopologyPosition::RIGHT:
return DisplayTopologyPosition::LEFT;
case DisplayTopologyPosition::BOTTOM:
return DisplayTopologyPosition::TOP;
}
}
bool validatePrimaryDisplay(const android::DisplayTopologyGraph& displayTopologyGraph) {
return displayTopologyGraph.primaryDisplayId != ui::LogicalDisplayId::INVALID &&
displayTopologyGraph.graph.contains(displayTopologyGraph.primaryDisplayId);
}
bool validateTopologyGraph(const android::DisplayTopologyGraph& displayTopologyGraph) {
for (const auto& [sourceDisplay, adjacentDisplays] : displayTopologyGraph.graph) {
for (const DisplayTopologyAdjacentDisplay& adjacentDisplay : adjacentDisplays) {
const auto adjacentGraphIt = displayTopologyGraph.graph.find(adjacentDisplay.displayId);
if (adjacentGraphIt == displayTopologyGraph.graph.end()) {
LOG(ERROR) << "Missing adjacent display in topology graph: "
<< adjacentDisplay.displayId << " for source " << sourceDisplay;
return false;
}
const auto reverseEdgeIt =
std::find_if(adjacentGraphIt->second.begin(), adjacentGraphIt->second.end(),
[sourceDisplay](const DisplayTopologyAdjacentDisplay&
reverseAdjacentDisplay) {
return sourceDisplay == reverseAdjacentDisplay.displayId;
});
if (reverseEdgeIt == adjacentGraphIt->second.end()) {
LOG(ERROR) << "Missing reverse edge in topology graph for: " << sourceDisplay
<< " -> " << adjacentDisplay.displayId;
return false;
}
DisplayTopologyPosition expectedPosition =
getOppositePosition(adjacentDisplay.position);
if (reverseEdgeIt->position != expectedPosition) {
LOG(ERROR) << "Unexpected reverse edge for: " << sourceDisplay << " -> "
<< adjacentDisplay.displayId
<< " expected position: " << ftl::enum_string(expectedPosition)
<< " actual " << ftl::enum_string(reverseEdgeIt->position);
return false;
}
if (reverseEdgeIt->offsetDp != -adjacentDisplay.offsetDp) {
LOG(ERROR) << "Unexpected reverse edge offset: " << sourceDisplay << " -> "
<< adjacentDisplay.displayId
<< " expected offset: " << -adjacentDisplay.offsetDp << " actual "
<< reverseEdgeIt->offsetDp;
return false;
}
}
}
return true;
}
bool validateDensities(const android::DisplayTopologyGraph& displayTopologyGraph) {
for (const auto& [sourceDisplay, adjacentDisplays] : displayTopologyGraph.graph) {
if (!displayTopologyGraph.displaysDensity.contains(sourceDisplay)) {
LOG(ERROR) << "Missing density value in topology graph for display: " << sourceDisplay;
return false;
}
}
return true;
}
} // namespace
bool DisplayTopologyGraph::isValid() const {
return validatePrimaryDisplay(*this) && validateTopologyGraph(*this) &&
validateDensities(*this);
}
} // namespace android
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