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/*
* Copyright 2021 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.
*/
#pragma once
#include <ui/GraphicTypes.h>
namespace android {
enum class HdrRenderType {
SDR, // just render to SDR
DISPLAY_HDR, // HDR by extended brightness
GENERIC_HDR // tonemapped HDR
};
/***
* A helper function to classify how we treat the result based on params.
*
* @param dataspace the dataspace
* @param pixelFormat optional, in case there is no source buffer.
* @param hdrSdrRatio default is 1.f, render engine side doesn't take care of it.
* @return HdrRenderType
*/
inline HdrRenderType getHdrRenderType(ui::Dataspace dataspace,
std::optional<ui::PixelFormat> pixelFormat,
float hdrSdrRatio = 1.f) {
const auto transfer = dataspace & HAL_DATASPACE_TRANSFER_MASK;
const auto range = dataspace & HAL_DATASPACE_RANGE_MASK;
if (transfer == HAL_DATASPACE_TRANSFER_ST2084 || transfer == HAL_DATASPACE_TRANSFER_HLG) {
return HdrRenderType::GENERIC_HDR;
}
static const auto BT2020_LINEAR_EXT = static_cast<ui::Dataspace>(HAL_DATASPACE_STANDARD_BT2020 |
HAL_DATASPACE_TRANSFER_LINEAR |
HAL_DATASPACE_RANGE_EXTENDED);
if ((dataspace == BT2020_LINEAR_EXT || dataspace == ui::Dataspace::V0_SCRGB) &&
pixelFormat.has_value() && pixelFormat.value() == ui::PixelFormat::RGBA_FP16) {
return HdrRenderType::GENERIC_HDR;
}
// Extended range layer with an hdr/sdr ratio of > 1.01f can "self-promote" to HDR.
if (range == HAL_DATASPACE_RANGE_EXTENDED && hdrSdrRatio > 1.01f) {
return HdrRenderType::DISPLAY_HDR;
}
return HdrRenderType::SDR;
}
} // namespace android
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