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/*
* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "modules/desktop_capture/win/dxgi_texture_staging.h"
#include <comdef.h>
#include <dxgi.h>
#include <dxgi1_2.h>
#include <unknwn.h>
#include "modules/desktop_capture/win/desktop_capture_utils.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "system_wrappers/include/metrics.h"
using Microsoft::WRL::ComPtr;
namespace webrtc {
DxgiTextureStaging::DxgiTextureStaging(const D3dDevice& device)
: device_(device) {}
DxgiTextureStaging::~DxgiTextureStaging() = default;
bool DxgiTextureStaging::InitializeStage(ID3D11Texture2D* texture) {
RTC_DCHECK(texture);
D3D11_TEXTURE2D_DESC desc = {0};
texture->GetDesc(&desc);
desc.ArraySize = 1;
desc.BindFlags = 0;
desc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
desc.MipLevels = 1;
desc.MiscFlags = 0;
desc.SampleDesc.Count = 1;
desc.SampleDesc.Quality = 0;
desc.Usage = D3D11_USAGE_STAGING;
if (stage_) {
AssertStageAndSurfaceAreSameObject();
D3D11_TEXTURE2D_DESC current_desc;
stage_->GetDesc(¤t_desc);
const bool recreate_needed =
(memcmp(&desc, ¤t_desc, sizeof(D3D11_TEXTURE2D_DESC)) != 0);
RTC_HISTOGRAM_BOOLEAN("WebRTC.DesktopCapture.StagingTextureRecreate",
recreate_needed);
if (!recreate_needed) {
return true;
}
// The descriptions are not consistent, we need to create a new
// ID3D11Texture2D instance.
stage_.Reset();
surface_.Reset();
} else {
RTC_DCHECK(!surface_);
}
_com_error error = device_.d3d_device()->CreateTexture2D(
&desc, nullptr, stage_.GetAddressOf());
if (error.Error() != S_OK || !stage_) {
RTC_LOG(LS_ERROR) << "Failed to create a new ID3D11Texture2D as stage: "
<< desktop_capture::utils::ComErrorToString(error);
return false;
}
error = stage_.As(&surface_);
if (error.Error() != S_OK || !surface_) {
RTC_LOG(LS_ERROR) << "Failed to convert ID3D11Texture2D to IDXGISurface: "
<< desktop_capture::utils::ComErrorToString(error);
return false;
}
return true;
}
void DxgiTextureStaging::AssertStageAndSurfaceAreSameObject() {
ComPtr<IUnknown> left;
ComPtr<IUnknown> right;
bool left_result = SUCCEEDED(stage_.As(&left));
bool right_result = SUCCEEDED(surface_.As(&right));
RTC_DCHECK(left_result);
RTC_DCHECK(right_result);
RTC_DCHECK(left.Get() == right.Get());
}
bool DxgiTextureStaging::CopyFromTexture(
const DXGI_OUTDUPL_FRAME_INFO& frame_info,
ID3D11Texture2D* texture) {
RTC_DCHECK_GT(frame_info.AccumulatedFrames, 0);
RTC_DCHECK(texture);
// AcquireNextFrame returns a CPU inaccessible IDXGIResource, so we need to
// copy it to a CPU accessible staging ID3D11Texture2D.
if (!InitializeStage(texture)) {
return false;
}
device_.context()->CopyResource(static_cast<ID3D11Resource*>(stage_.Get()),
static_cast<ID3D11Resource*>(texture));
*rect() = {0};
_com_error error = surface_->Map(rect(), DXGI_MAP_READ);
if (error.Error() != S_OK) {
*rect() = {0};
RTC_LOG(LS_ERROR) << "Failed to map the IDXGISurface to a bitmap: "
<< desktop_capture::utils::ComErrorToString(error);
return false;
}
return true;
}
bool DxgiTextureStaging::DoRelease() {
_com_error error = surface_->Unmap();
if (error.Error() != S_OK) {
stage_.Reset();
surface_.Reset();
}
// If using staging mode, we only need to recreate ID3D11Texture2D instance.
// This will happen during next CopyFrom call. So this function always returns
// true.
return true;
}
} // namespace webrtc
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