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

/////////////////////////////////////////////////////////////////////////////
// Name:        dcmemory.cpp
// Purpose:     wxMemoryDC class
// Author:      Julian Smart
// Modified by:
// Created:     01/02/97
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart
// Licence:   	wxWindows licence
/////////////////////////////////////////////////////////////////////////////

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

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

#include <Xm/Xm.h>

#include "wx/motif/private.h"

//-----------------------------------------------------------------------------
// wxMemoryDC
//-----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxMemoryDC, wxWindowDC)

wxMemoryDC::wxMemoryDC(void)
{
    m_ok = TRUE;
    m_display = wxGetDisplay();

    Display* display = (Display*) m_display;

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

    m_backgroundPixel = (int) gcvalues.background;

    // Get the current Font so we can set it back later
    XGCValues valReturn;
    XGetGCValues((Display*) m_display, (GC) m_gc, GCFont, &valReturn);
    m_oldFont = (WXFont) valReturn.font;
    SetBrush (wxWHITE_BRUSH);
    SetPen (wxBLACK_PEN);
};

wxMemoryDC::wxMemoryDC( wxDC* dc )
{
    m_ok = TRUE;
    if (dc && dc->IsKindOf(CLASSINFO(wxWindowDC)))
        m_display = ((wxWindowDC*)dc)->GetDisplay();
    else
        m_display = wxGetDisplay();

    Display* display = (Display*) m_display;

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

    m_backgroundPixel = (int) gcvalues.background;

    // Get the current Font so we can set it back later
    XGCValues valReturn;
    XGetGCValues((Display*) m_display, (GC) m_gc, GCFont, &valReturn);
    m_oldFont = (WXFont) valReturn.font;
    SetBrush (wxWHITE_BRUSH);
    SetPen (wxBLACK_PEN);
};

wxMemoryDC::~wxMemoryDC(void)
{
};

void wxMemoryDC::SelectObject( const wxBitmap& bitmap )
{
  m_bitmap = bitmap;

  if (m_gc)
    XFreeGC((Display*) m_display, (GC) m_gc);
  m_gc = (WXGC) NULL;

  if (m_bitmap.Ok() && (bitmap.GetDisplay() == m_display))
  {
    m_pixmap = m_bitmap.GetPixmap();
    Display* display = (Display*) m_display;

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

    m_backgroundPixel = (int) gcvalues.background;

    // Get the current Font so we can set it back later
    XGCValues valReturn;
    XGetGCValues((Display*) m_display, (GC) m_gc, GCFont, &valReturn);
    m_oldFont = (WXFont) valReturn.font;

    bool oldOpt = GetOptimization();
    SetOptimization(FALSE);
    
    SetBrush (wxWHITE_BRUSH);
    SetPen (wxBLACK_PEN);

    SetOptimization(oldOpt);

    m_ok = TRUE;
  }
  else
  {
    m_ok = FALSE;
    m_pixmap = (WXPixmap) 0;
  };
};

void wxMemoryDC::GetSize( int *width, int *height ) const
{
  if (m_bitmap.Ok())
  {
    if (width) (*width) = m_bitmap.GetWidth();
    if (height) (*height) = m_bitmap.GetHeight();
  }
  else
  {
    if (width) (*width) = 0;
    if (height) (*height) = 0;
  };
};