128 lines
3.7 KiB
C++
128 lines
3.7 KiB
C++
/*
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* Copyright 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "DisplayConfig.h"
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#include <unordered_map>
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namespace {
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template <class T>
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inline void hashCombine(size_t& hash, const T& value) {
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std::hash<T> hasher;
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hash ^= hasher(value) + 0x9e3779b9 + (hash << 6) + (hash >> 2);
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}
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} // namespace
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void DisplayConfig::setAttribute(HWC2::Attribute attribute, int32_t value) {
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if (attribute == HWC2::Attribute::Width) {
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mWidth = value;
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}
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if (attribute == HWC2::Attribute::Height) {
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mHeight = value;
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}
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if (attribute == HWC2::Attribute::DpiX) {
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mDpiX = value;
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}
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if (attribute == HWC2::Attribute::DpiY) {
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mDpiY = value;
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}
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if (attribute == HWC2::Attribute::VsyncPeriod) {
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mVsyncPeriodNanos = value;
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}
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if (attribute == HWC2::Attribute::ConfigGroup) {
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mConfigGroup = value;
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}
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}
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int32_t DisplayConfig::getAttribute(HWC2::Attribute attribute) const {
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if (attribute == HWC2::Attribute::Width) {
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return mWidth;
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}
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if (attribute == HWC2::Attribute::Height) {
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return mHeight;
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}
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if (attribute == HWC2::Attribute::DpiX) {
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// From hwcomposer2.h, HWC2_ATTRIBUTE_DPI_X returns "Dots per thousand
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// inches (DPI * 1000)".
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return getDotsPerThousandInchesX();
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}
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if (attribute == HWC2::Attribute::DpiY) {
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// From hwcomposer2.h, HWC2_ATTRIBUTE_DPI_Y returns "Dots per thousand
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// inches (DPI * 1000)"
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return getDotsPerThousandInchesY();
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}
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if (attribute == HWC2::Attribute::VsyncPeriod) {
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return mVsyncPeriodNanos;
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}
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if (attribute == HWC2::Attribute::ConfigGroup) {
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return mConfigGroup;
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}
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return -1;
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}
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std::string DisplayConfig::toString() const {
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std::string output;
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output += " w:" + std::to_string(mWidth);
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output += " h:" + std::to_string(mHeight);
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output += " dpi-x:" + std::to_string(mDpiX);
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output += " dpi-y:" + std::to_string(mDpiY);
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output += " vsync:" + std::to_string(1e9 / mVsyncPeriodNanos);
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output += " config-group:" + std::to_string(mConfigGroup);
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return output;
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}
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/*static*/
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void DisplayConfig::addConfigGroups(std::vector<DisplayConfig>* configs) {
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// From /hardware/interfaces/graphics/composer/2.4/IComposerClient.hal:
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// "Configurations which share the same config group are similar in all
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// attributes except for the vsync period."
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struct ConfigForGroupHash {
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size_t operator()(const DisplayConfig& config) const {
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size_t hash = 0;
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hashCombine(hash, config.mWidth);
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hashCombine(hash, config.mHeight);
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hashCombine(hash, config.mDpiX);
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hashCombine(hash, config.mDpiY);
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return hash;
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}
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};
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struct ConfigForGroupEq {
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size_t operator()(const DisplayConfig& a, const DisplayConfig& b) const {
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if (a.mWidth != b.mWidth) {
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return a.mWidth < b.mWidth;
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}
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if (a.mHeight != b.mHeight) {
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return a.mHeight < b.mHeight;
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}
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if (a.mDpiX != b.mDpiX) {
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return a.mDpiX < b.mDpiX;
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}
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return a.mDpiY < b.mDpiY;
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}
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};
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std::unordered_map<DisplayConfig, int32_t, ConfigForGroupHash,
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ConfigForGroupEq>
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configToConfigGroup;
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for (auto& config : *configs) {
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auto [it, inserted] =
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configToConfigGroup.try_emplace(config, configToConfigGroup.size());
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config.setConfigGroup(it->second);
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}
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} |