thread fixes for MSW (samples doesn't compile currently under !MSW, will

[wxWidgets.git] / src / motif / dcscreen.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        dcscreen.cpp
// Purpose:     wxScreenDC class
// Author:      Julian Smart
// Modified by:
// Created:     17/09/98
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart
// Licence:   	wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifdef __GNUG__
#pragma implementation "dcscreen.h"
#endif

#include "wx/dcscreen.h"
#include "wx/utils.h"

#include <Xm/Xm.h>

#include <wx/motif/private.h>

#if !USE_SHARED_LIBRARY
IMPLEMENT_DYNAMIC_CLASS(wxScreenDC, wxWindowDC)
#endif

WXWindow wxScreenDC::sm_overlayWindow = 0;
int wxScreenDC::sm_overlayWindowX = 0;
int wxScreenDC::sm_overlayWindowY = 0;

// Create a DC representing the whole screen
wxScreenDC::wxScreenDC()
{
  m_display = wxGetDisplay();
  Display* display = (Display*) m_display;

  if (sm_overlayWindow)
  {
    m_pixmap = sm_overlayWindow;
    m_deviceOriginX = - sm_overlayWindowX;
    m_deviceOriginY = - sm_overlayWindowY;
  }
  else
    m_pixmap = (WXPixmap) RootWindow(display, DefaultScreen(display));

  XGCValues gcvalues;
  gcvalues.foreground = BlackPixel (display, DefaultScreen (display));
  gcvalues.background = WhitePixel (display, DefaultScreen (display));
  gcvalues.graphics_exposures = False;
  gcvalues.subwindow_mode = IncludeInferiors;
  gcvalues.line_width = 1;
  m_gc = XCreateGC (display, RootWindow (display, DefaultScreen (display)),
	    GCForeground | GCBackground | GCGraphicsExposures | GCLineWidth | GCSubwindowMode,
		  &gcvalues);

  m_backgroundPixel = (int) gcvalues.background;
  m_ok = TRUE;
}

wxScreenDC::~wxScreenDC()
{
}

bool wxScreenDC::StartDrawingOnTop(wxWindow* window)
{
  wxRect rect;
  int x, y, width, height;
  window->GetPosition(& x, & y);
  if (window->GetParent())
      window->GetParent()->ClientToScreen(& x, & y);
  window->GetSize(& width, & height);
  rect.x = x; rect.y = y;
  rect.width = width; rect.height = height;

  return StartDrawingOnTop(& rect);
}

bool wxScreenDC::StartDrawingOnTop(wxRect* rect)
{
  if (sm_overlayWindow)
    return FALSE;

  Display *dpy = (Display*) wxGetDisplay();
  Pixmap screenPixmap = RootWindow(dpy, DefaultScreen(dpy));

  int x = 0;
  int y = 0;
  int width, height;
  wxDisplaySize(&width, &height);

  if (rect)
  {
    x = rect->x; y = rect->y;
    width = rect->width; height = rect->height;
  }
  sm_overlayWindowX = x;
  sm_overlayWindowY = y;

  XSetWindowAttributes attributes;
  attributes.override_redirect = True;
  unsigned long valueMask = CWOverrideRedirect;

  sm_overlayWindow = (WXWindow) XCreateWindow(dpy, screenPixmap, x, y, width, height, 0,
			 wxDisplayDepth(), InputOutput,
			 DefaultVisual(dpy, 0), valueMask,
			 & attributes);

  if (sm_overlayWindow)
  {
    XMapWindow(dpy, (Window) sm_overlayWindow);
    return TRUE;
  }
  else
    return FALSE;
}

bool wxScreenDC::EndDrawingOnTop()
{
  if (sm_overlayWindow)
  {
    XDestroyWindow((Display*) wxGetDisplay(), (Window) sm_overlayWindow);
    sm_overlayWindow = 0;
    return TRUE;
  }
  else
    return FALSE;
}