Update example_09-11.cpp

Comments up front, extensive changes in the back

example_09-11.cpp

@@ -1,3 +1,5 @@
+// Example 9-11. An example header file for our custom View class
+//
 class COpenCVTestView : public CWindowImpl<COpenCVTestView> {
 public:
   DECLARE_WND_CLASS(NULL)
@@ -49,4 +51,126 @@ class COpenCVTestView : public CWindowImpl<COpenCVTestView> {
   cv::VideoCapture m_cap;
   cv::Mat          m_cv_img;
   RGBTRIPLE*       m_bitmapBits;
-};
+};
+
+LRESULT CMainFrame::OnFileOpen(
+      WORD /*wNotifyCode*/,
+      WORD /*wID*/,
+      HWND /*hWndCtl*/,
+      BOOL& /*bHandled*/
+  ) {
+  WTL::CFileDialog dlg(TRUE);
+  if (IDOK == dlg.DoModal(m_hWnd)) {
+    m_view.OpenFile(dlg.m_szFileName);
+  }
+  return 0;
+}
+
+bool COpenCVTestView::OpenFile(std::string file) {
+  if( !m_cap.open( file ) ) return false;
+  // If we opened the file, set up everything now:
+  //
+  m_cap.read( m_cv_img );
+  // could create a DIBSection here, but let's just allocate memory for raw bits
+  //
+  m_bitmapBits = new RGBTRIPLE[m_cv_img.cols * m_cv_img.rows];
+  _copyImage();
+  SetTimer(0, 1000.0f / m_cap.get( cv::CAP_PROP_FPS ) );
+  return true;
+}
+
+void COpenCVTestView::_copyImage() {
+  // Copy the image data into the bitmap
+  //
+  cv::Mat cv_header_to_qt_image(
+  cv::Size(
+  m_cv_img.cols,
+  m_cv_img.rows
+  ),
+  CV_8UC3,
+  m_bitmapBits
+  );
+  cv::cvtColor( m_cv_img, cv_header_to_qt_image, cv::BGR2RGB );
+}
+
+LRESULT COpenCVTestView::OnPaint(
+  UINT
+  /* uMsg
+  */,
+  WPARAM /* wParam
+  */,
+  LPARAM /* lParam
+  */,
+  BOOL& /* bHandled */
+  ) {
+  CPaintDC dc(m_hWnd);
+  WTL::CRect rect;
+  GetClientRect(&rect);
+  if( m_cap.isOpened() ) {
+  BITMAPINFO bmi = {0};
+  bmi.bmiHeader.biSize = sizeof(bmi.bmiHeader);
+  bmi.bmiHeader.biCompression = BI_RGB;
+  bmi.bmiHeader.biWidth
+  = m_cv_img.cols;
+  // note that bitmaps default to bottom-up, use negative height to
+  // represent top-down
+  //
+  bmi.bmiHeader.biHeight = m_cv_img.rows * -1;
+  bmi.bmiHeader.biPlanes = 1;
+  bmi.bmiHeader.biBitCount = 24;
+  dc.StretchDIBits(
+  0,
+  rect.Width(),
+  0,
+  bmi.bmiHeader.biWidth,
+  m_bitmapBits,
+  &bmi,
+  DIB_RGB_COLORS,
+  SRCCOPY
+  // 32 if you use RGBQUADs for the bits
+  0,
+  rect.Height(),
+  0,
+  abs(bmi.bmiHeader.biHeight),
+  Working with Windows
+  |
+  245);
+  } else {
+  dc.FillRect(rect, COLOR_WINDOW);
+  }
+  return 0;
+}
+
+RESULT COpenCVTestView::OnTimer(
+  UINT
+  /* uMsg
+  */,
+  WPARAM /* wParam
+  */,
+  LPARAM /* lParam
+  */,
+  BOOL& /* bHandled */
+  ) {
+  // Nothing to do if capture object is not open
+  //
+  if( !m_cap.isOpened() ) return 0;
+  m_cap.read( m_cv_img );
+  _copyImage();
+  Invalidate();
+  return 0;
+ }
+
+LRESULT COpenCVTestView::OnEraseBkgnd(
+  UINT
+  /* uMsg
+  */,
+  WPARAM /* wParam
+  */,
+  LPARAM /* lParam
+  */,
+  BOOL& /* bHandled */
+  ) {
+  // since we completely paint our window in the OnPaint handler, use
+  // an empty background handler
+  return 0;
+}