C++ (Cpp) drawGl Examples

Example #1

File: window_gtk.cpp Project: 112000/opencv

static gboolean cvImageWidget_expose(GtkWidget* widget, GdkEventExpose* event, gpointer data)
{
#ifdef HAVE_OPENGL
    CvWindow* window = (CvWindow*)data;

    if (window->useGl)
    {
        drawGl(window);
        return TRUE;
    }
#else
    (void)data;
#endif

  CvImageWidget *image_widget = NULL;
  cairo_t *cr = NULL;
  GdkPixbuf *pixbuf = NULL;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (CV_IS_IMAGE_WIDGET (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  if (event->count > 0)
    return FALSE;

  cr = gdk_cairo_create(widget->window);
  image_widget = CV_IMAGE_WIDGET (widget);

  if( image_widget->scaled_image ){
      // center image in available region
      int x0 = (widget->allocation.width - image_widget->scaled_image->cols)/2;
      int y0 = (widget->allocation.height - image_widget->scaled_image->rows)/2;

      pixbuf = gdk_pixbuf_new_from_data(image_widget->scaled_image->data.ptr, GDK_COLORSPACE_RGB, false,
          8, MIN(image_widget->scaled_image->cols, widget->allocation.width),
          MIN(image_widget->scaled_image->rows, widget->allocation.height),
          image_widget->scaled_image->step, NULL, NULL);

      gdk_cairo_set_source_pixbuf(cr, pixbuf, x0, y0);
  }
  else if( image_widget->original_image ){
      pixbuf = gdk_pixbuf_new_from_data(image_widget->original_image->data.ptr, GDK_COLORSPACE_RGB, false,
          8, MIN(image_widget->original_image->cols, widget->allocation.width),
          MIN(image_widget->original_image->rows, widget->allocation.height),
          image_widget->original_image->step, NULL, NULL);
      gdk_cairo_set_source_pixbuf(cr, pixbuf, 0, 0);
  }

  cairo_paint(cr);
  g_object_unref(pixbuf);
  cairo_destroy(cr);
  return TRUE;
}

Example #2

File: window_gtk.cpp Project: 4auka/opencv

static gboolean cvImageWidget_expose(GtkWidget* widget, GdkEventExpose* event, gpointer data)
{
#ifdef HAVE_OPENGL
    CvWindow* window = (CvWindow*)data;

    if (window->useGl)
    {
        drawGl(window);
        return TRUE;
    }
#else
    (void)data;
#endif

  CvImageWidget *image_widget;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (CV_IS_IMAGE_WIDGET (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  if (event->count > 0)
    return FALSE;

  image_widget = CV_IMAGE_WIDGET (widget);

  gdk_window_clear_area (widget->window,
                         0, 0,
                         widget->allocation.width,
                         widget->allocation.height);
  if( image_widget->scaled_image ){
      // center image in available region
      int x0 = (widget->allocation.width - image_widget->scaled_image->cols)/2;
      int y0 = (widget->allocation.height - image_widget->scaled_image->rows)/2;

      gdk_draw_rgb_image( widget->window, widget->style->fg_gc[GTK_STATE_NORMAL],
          x0, y0, MIN(image_widget->scaled_image->cols, widget->allocation.width),
          MIN(image_widget->scaled_image->rows, widget->allocation.height),
          GDK_RGB_DITHER_MAX, image_widget->scaled_image->data.ptr, image_widget->scaled_image->step );
  }
  else if( image_widget->original_image ){
      gdk_draw_rgb_image( widget->window, widget->style->fg_gc[GTK_STATE_NORMAL],
          0, 0,
          MIN(image_widget->original_image->cols, widget->allocation.width),
           MIN(image_widget->original_image->rows, widget->allocation.height),
          GDK_RGB_DITHER_MAX, image_widget->original_image->data.ptr, image_widget->original_image->step );
  }
  return TRUE;
}