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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/gpu/windows/display_helper.h"
namespace {
// Magic constants to convert to fixed point.
// https://docs.microsoft.com/en-us/windows/win32/api/dxgi1_5/ns-dxgi1_5-dxgi_hdr_metadata_hdr10
static constexpr int kPrimariesFixedPoint = 50000;
static constexpr int kLuminanceFixedPoint = 10000;
} // namespace
namespace media {
DisplayHelper::DisplayHelper(const ComD3D11Device& d3d11_device) {
CacheDisplayMetadata(d3d11_device);
}
DisplayHelper::~DisplayHelper() = default;
base::Optional<DXGI_HDR_METADATA_HDR10> DisplayHelper::GetDisplayMetadata() {
return hdr_metadata_;
}
void DisplayHelper::CacheDisplayMetadata(const ComD3D11Device& d3d11_device) {
hdr_metadata_.reset();
if (!d3d11_device)
return;
ComDXGIDevice dxgi_device;
if (FAILED(d3d11_device.As(&dxgi_device)))
return;
ComDXGIAdapter dxgi_adapter;
if (FAILED(dxgi_device->GetAdapter(&dxgi_adapter)))
return;
ComDXGIFactory dxgi_factory;
if (FAILED(dxgi_adapter->GetParent(__uuidof(IDXGIFactory), &dxgi_factory)))
return;
DXGI_OUTPUT_DESC1 desc_best{};
bool found_monitor = false;
// Enumerate all the monitors attached to all the adapters. Pick the
// brightest monitor as the one we want, which makes no sense really.
// TODO(liberato): figure out what monitor we're actually using, or get that
// from the renderer.
ComDXGIAdapter adapter;
for (unsigned int i = 0;
dxgi_factory->EnumAdapters(i, &adapter) != DXGI_ERROR_NOT_FOUND; i++) {
ComDXGIOutput output;
for (unsigned int u = 0;
adapter->EnumOutputs(u, &output) != DXGI_ERROR_NOT_FOUND; u++) {
ComDXGIOutput6 output6;
if (FAILED(output.As(&output6)))
continue;
DXGI_OUTPUT_DESC1 desc1{};
if (FAILED(output6->GetDesc1(&desc1)))
continue;
if (desc_best.MaxLuminance < desc1.MaxLuminance) {
desc_best = desc1;
found_monitor = true;
}
}
}
if (!found_monitor)
return;
DXGI_HDR_METADATA_HDR10 metadata{};
auto& primary_r = desc_best.RedPrimary;
metadata.RedPrimary[0] = primary_r[0] * kPrimariesFixedPoint;
metadata.RedPrimary[1] = primary_r[1] * kPrimariesFixedPoint;
auto& primary_g = desc_best.GreenPrimary;
metadata.GreenPrimary[0] = primary_g[0] * kPrimariesFixedPoint;
metadata.GreenPrimary[1] = primary_g[1] * kPrimariesFixedPoint;
auto& primary_b = desc_best.BluePrimary;
metadata.BluePrimary[0] = primary_b[0] * kPrimariesFixedPoint;
metadata.BluePrimary[1] = primary_b[1] * kPrimariesFixedPoint;
auto& white_point = desc_best.WhitePoint;
metadata.WhitePoint[0] = white_point[0] * kPrimariesFixedPoint;
metadata.WhitePoint[1] = white_point[1] * kPrimariesFixedPoint;
metadata.MaxMasteringLuminance =
desc_best.MaxLuminance * kLuminanceFixedPoint;
metadata.MinMasteringLuminance =
desc_best.MinLuminance * kLuminanceFixedPoint;
// It's unclear how to set these properly, so this is a guess.
// Also note that these are not fixed-point.
metadata.MaxContentLightLevel = desc_best.MaxFullFrameLuminance;
metadata.MaxFrameAverageLightLevel = desc_best.MaxFullFrameLuminance;
hdr_metadata_ = metadata;
}
// static
DXGI_HDR_METADATA_HDR10 DisplayHelper::HdrMetadataToDXGI(
const HDRMetadata& hdr_metadata) {
DXGI_HDR_METADATA_HDR10 metadata{};
auto& primary_r = hdr_metadata.mastering_metadata.primary_r;
metadata.RedPrimary[0] = primary_r.x() * kPrimariesFixedPoint;
metadata.RedPrimary[1] = primary_r.y() * kPrimariesFixedPoint;
auto& primary_g = hdr_metadata.mastering_metadata.primary_g;
metadata.GreenPrimary[0] = primary_g.x() * kPrimariesFixedPoint;
metadata.GreenPrimary[1] = primary_g.y() * kPrimariesFixedPoint;
auto& primary_b = hdr_metadata.mastering_metadata.primary_b;
metadata.BluePrimary[0] = primary_b.x() * kPrimariesFixedPoint;
metadata.BluePrimary[1] = primary_b.y() * kPrimariesFixedPoint;
auto& white_point = hdr_metadata.mastering_metadata.white_point;
metadata.WhitePoint[0] = white_point.x() * kPrimariesFixedPoint;
metadata.WhitePoint[1] = white_point.y() * kPrimariesFixedPoint;
metadata.MaxMasteringLuminance =
hdr_metadata.mastering_metadata.luminance_max * kLuminanceFixedPoint;
metadata.MinMasteringLuminance =
hdr_metadata.mastering_metadata.luminance_min * kLuminanceFixedPoint;
metadata.MaxContentLightLevel = hdr_metadata.max_content_light_level;
metadata.MaxFrameAverageLightLevel =
hdr_metadata.max_frame_average_light_level;
return metadata;
}
} // namespace media
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