qt_rtmp_demo/media/screen_capture.cpp

#include "screen_capture.h"

#include <conio.h>
#include <stdio.h>
#include <QDebug>
#include <QString>

#if _MSC_VER >= 1600
#pragma execution_character_set("utf-8")
#endif


#define WIDEN2(x) L ## x
#define WIDEN(x) WIDEN2(x)
#define __WFILE__ WIDEN(__FILE__)
#define HRCHECK(__expr) {hr=(__expr);if(FAILED(hr)){wprintf(L"FAILURE 0x%08X (%i)\n\tline: %u file: '%s'\n\texpr: '" WIDEN(#__expr) L"'\n",hr, hr, __LINE__,__WFILE__);goto cleanup;}}
#define RELEASE(__p) {if(__p!=nullptr){__p->Release();__p=nullptr;}}

// ȱenum·½·¨
// https://www.gamedev.net/forums/topic/132636-enum-displaymode--dx9--false/

HRESULT SavePixelsToFile32bppPBGRA(UINT width, UINT height, UINT stride,
                                   LPBYTE pixels, LPWSTR filePath, const GUID &format)
{
    if (!filePath || !pixels)
      return E_INVALIDARG;

    HRESULT hr = S_OK;
    IWICImagingFactory *factory = nullptr;
    IWICBitmapEncoder *encoder = nullptr;
    IWICBitmapFrameEncode *frame = nullptr;
    IWICStream *stream = nullptr;
    GUID pf = GUID_WICPixelFormat32bppPBGRA;
    BOOL coInit = CoInitialize(nullptr);

    HRCHECK(CoCreateInstance(CLSID_WICImagingFactory, nullptr, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&factory)));
    HRCHECK(factory->CreateStream(&stream));
    HRCHECK(stream->InitializeFromFilename(filePath, GENERIC_WRITE));
    HRCHECK(factory->CreateEncoder(format, nullptr, &encoder));
    HRCHECK(encoder->Initialize(stream, WICBitmapEncoderNoCache));
    HRCHECK(encoder->CreateNewFrame(&frame, nullptr)); // we don't use options here
    HRCHECK(frame->Initialize(nullptr)); // we dont' use any options here
    HRCHECK(frame->SetSize(width, height));
    HRCHECK(frame->SetPixelFormat(&pf));
    HRCHECK(frame->WritePixels(height, stride, stride * height, pixels));
    HRCHECK(frame->Commit());
    HRCHECK(encoder->Commit());

    cleanup:
    RELEASE(stream);
    RELEASE(frame);
    RELEASE(encoder);
    RELEASE(factory);
    if (coInit) CoUninitialize();
    return hr;
}

HRESULT Direct3D9TakeScreenshots(UINT adapter, UINT count)
{
  HRESULT hr = S_OK;
  IDirect3D9 *d3d = nullptr;
  IDirect3DDevice9 *device = nullptr;
  IDirect3DSurface9 *surface = nullptr;
  D3DPRESENT_PARAMETERS parameters = { 0 };
  D3DDISPLAYMODE mode;
  D3DLOCKED_RECT rc;
  UINT pitch;
  SYSTEMTIME st;
  LPBYTE *shots = nullptr;

  // init D3D and get screen size
  d3d = Direct3DCreate9(D3D_SDK_VERSION);
  HRCHECK(d3d->GetAdapterDisplayMode(adapter, &mode));

  parameters.Windowed = TRUE;
  parameters.BackBufferCount = 1;
  parameters.BackBufferHeight = mode.Height;
  parameters.BackBufferWidth = mode.Width;
  parameters.SwapEffect = D3DSWAPEFFECT_DISCARD;
  parameters.hDeviceWindow = NULL;

  // create device & capture surface
  HRCHECK(d3d->CreateDevice(adapter, D3DDEVTYPE_HAL, NULL, D3DCREATE_SOFTWARE_VERTEXPROCESSING, &parameters, &device));
  HRCHECK(device->CreateOffscreenPlainSurface(mode.Width, mode.Height, D3DFMT_A8R8G8B8, D3DPOOL_SYSTEMMEM, &surface, nullptr));

  // compute the required buffer size
  HRCHECK(surface->LockRect(&rc, NULL, 0));
  pitch = rc.Pitch;
  HRCHECK(surface->UnlockRect());

  // allocate screenshots buffers
  shots = new LPBYTE[count];
  for (UINT i = 0; i < count; i++)
  {
    shots[i] = new BYTE[pitch * mode.Height];
  }

  GetSystemTime(&st); // measure the time we spend doing <count> captures
  wprintf(L"%i:%i:%i.%i\n", st.wHour, st.wMinute, st.wSecond, st.wMilliseconds);
  for (UINT i = 0; i < count; i++)
  {
    // get the data
    HRCHECK(device->GetFrontBufferData(0, surface));

    // copy it into our buffers
    HRCHECK(surface->LockRect(&rc, NULL, 0));
    CopyMemory(shots[i], rc.pBits, rc.Pitch * mode.Height);
    HRCHECK(surface->UnlockRect());
  }
  GetSystemTime(&st);
  wprintf(L"%i:%i:%i.%i\n", st.wHour, st.wMinute, st.wSecond, st.wMilliseconds);

  // save all screenshots
  for (UINT i = 0; i < count; i++)
  {
    WCHAR file[100];
    wsprintf(file, L"cap%i.png", i);
    HRCHECK(SavePixelsToFile32bppPBGRA(mode.Width, mode.Height, pitch, shots[i], file, GUID_ContainerFormatPng));
  }

cleanup:
  if (shots != nullptr)
  {
    for (UINT i = 0; i < count; i++)
    {
      delete shots[i];
    }
    delete[] shots;
  }
  RELEASE(surface);
  RELEASE(device);
  RELEASE(d3d);
  return hr;
}

ScreenCapture::ScreenCapture()
{
    m_d3d9_dev = ::Direct3DCreate9(D3D_SDK_VERSION);

}

BOOL CALLBACK MonitorEnumProc(HMONITOR hMonitor,HDC hdcMonitor,
                              LPRECT lprcMonitor,LPARAM dwData)
{
     MONITORINFOEX mi;
     mi.cbSize=sizeof(MONITORINFOEX);
     GetMonitorInfo(hMonitor,&mi);
     qDebug()<<QString::asprintf("Device name:%s\t",mi.szDevice);
     if(mi.dwFlags==MONITORINFOF_PRIMARY) printf("Primary monitor!\n");
     else printf("\n");
     qDebug()<<QString::asprintf("Monitor rectangle:(%d,%d,%d,%d)\n",mi.rcMonitor.left,mi.rcMonitor.top,
                                 mi.rcMonitor.right,mi.rcMonitor.bottom);
     qDebug()<<QString::asprintf("Work rectangle:(%d,%d,%d,%d)\n",mi.rcWork.left,mi.rcWork.top,
                                 mi.rcWork.right,mi.rcWork.bottom);
     return true;
}

void ScreenCapture::EnumScreen()
{
//    EnumDisplayMonitors(NULL,NULL,MonitorEnumProc,NULL);
    if(m_d3d9_dev == NULL)
    {
        return;
    }
    D3DADAPTER_IDENTIFIER9 adapterID; // Used to store device info
    char strBuffer[20480];
    DWORD dwDisplayCount = m_d3d9_dev->GetAdapterCount();
    for(DWORD i = 0; i < dwDisplayCount; i++)
    {
        if( m_d3d9_dev->GetAdapterIdentifier( i/*D3DADAPTER_DEFAULT*/, 0,&adapterID ) != D3D_OK )
        {
            return;
        }
        qDebug()<<adapterID.DeviceName;
    }
}