IG_dspl_update_rect

IG_dspl_update_rect_set

In This Topic

This function sets the new value to update rectangle. Usually this value is received from Expose X event.

Declaration:

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AT_ERRCOUNT ACCUAPI IG_dspl_update_rect_set( [IN] HIGEAR hIGear, [IN] DWORD dwGrpID, [IN] const LPAT_RECTANGLE lpUpdateRect );

Arguments:

Name	Type	Description
hIGear	HIGEAR	Image handle of an image.
dwGrpID	DWORD	Identifier of the group in which to set the update rectangle.
lpUpdateRect	const LPAT_RECTANGLE	Sets new value to UpdateRect option.

Return Value:

Returns the number of ImageGear errors that occurred during this function call.

Supported Raster Image Formats:

All pixel formats supported by ImageGear for C and C++.

Sample:

filters

Example:

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void wndDrawImage_callback( Widget w, XtPointer data, XtPointer call_data ) { XmDrawingAreaCallbackStructcbs = (XmDrawingAreaCallbackStruct)call_data; XExposeEventevent = (XExposeEvent)cbs->event; AT_RECTANGLEUpdateRect; /* Redisplay only on last event of the series / if( IG_image_is_valid( hIGear ) ) { / Set the dirty rectangle for repaint / UpdateRect.x= event->x; UpdateRect.y= event->y; UpdateRect.width= event->width; UpdateRect.height = event->height; IG_dspl_update_rect_set( hIGear, IG_GRP_DEFAULT, &UpdateRect ); / Repaint window on expose events */ IG_dspl_image_draw( hIGear, IG_GRP_DEFAULT, XtWindow(w), XDefaultGCOfScreen(XtScreen(w)), NULL ); } }

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void wndDrawImage_callback( Widget w, XtPointer data, XtPointer call_data )
{
   XmDrawingAreaCallbackStruct*cbs =
   (XmDrawingAreaCallbackStruct*)call_data;
   XExposeEvent*event = (XExposeEvent*)cbs->event;
   AT_RECTANGLEUpdateRect;
   /* Redisplay only on last event of the series */
   if( IG_image_is_valid( hIGear ) )
   {
      /* Set the dirty rectangle for repaint */
      UpdateRect.x= event->x;
      UpdateRect.y= event->y;
      UpdateRect.width= event->width;
      UpdateRect.height = event->height;
      IG_dspl_update_rect_set( hIGear, IG_GRP_DEFAULT, &UpdateRect );
      /* Repaint window on expose events */
      IG_dspl_image_draw( hIGear, IG_GRP_DEFAULT, XtWindow(w),
      XDefaultGCOfScreen(XtScreen(w)), NULL );
   }
}