Add wxEvtHandler::CallAfter() for asynchronous method calls.

[wxWidgets.git] / src / gtk1 / dcclient.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        src/gtk1/dcclient.cpp
// Purpose:
// Author:      Robert Roebling
// RCS-ID:      $Id$
// Copyright:   (c) 1998 Robert Roebling, Chris Breeze
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __VMS
#define XCopyPlane XCOPYPLANE
#endif

#ifndef WX_PRECOMP
    #include "wx/log.h"
    #include "wx/math.h" // for floating-point functions
    #include "wx/image.h"
    #include "wx/module.h"
#endif

#include "wx/fontutil.h"

#include "wx/gtk1/win_gtk.h"
#include "wx/gtk1/dcclient.h"
#include "wx/gtk1/dcmemory.h"

#include <gdk/gdk.h>
#include <gdk/gdkx.h>
#include <gdk/gdkprivate.h>
#include <gtk/gtk.h>

//-----------------------------------------------------------------------------
// local defines
//-----------------------------------------------------------------------------

#define USE_PAINT_REGION 1

//-----------------------------------------------------------------------------
// local data
//-----------------------------------------------------------------------------

#include "bdiag.xbm"
#include "fdiag.xbm"
#include "cdiag.xbm"
#include "horiz.xbm"
#include "verti.xbm"
#include "cross.xbm"
#define  num_hatches 6

#define IS_15_PIX_HATCH(s) ((s)==wxCROSSDIAG_HATCH || (s)==wxHORIZONTAL_HATCH || (s)==wxVERTICAL_HATCH)
#define IS_16_PIX_HATCH(s) ((s)!=wxCROSSDIAG_HATCH && (s)!=wxHORIZONTAL_HATCH && (s)!=wxVERTICAL_HATCH)


static GdkPixmap  *hatches[num_hatches];
static GdkPixmap **hatch_bitmap = (GdkPixmap **) NULL;

extern GtkWidget *wxGetRootWindow();

//-----------------------------------------------------------------------------
// constants
//-----------------------------------------------------------------------------

const double RAD2DEG  = 180.0 / M_PI;

// ----------------------------------------------------------------------------
// private functions
// ----------------------------------------------------------------------------

static inline double dmax(double a, double b) { return a > b ? a : b; }
static inline double dmin(double a, double b) { return a < b ? a : b; }

static inline double DegToRad(double deg) { return (deg * M_PI) / 180.0; }

//-----------------------------------------------------------------------------
// temporary implementation of the missing GDK function
//-----------------------------------------------------------------------------

#include "gdk/gdkprivate.h"

void gdk_wx_draw_bitmap(GdkDrawable  *drawable,
                        GdkGC        *gc,
                        GdkDrawable  *src,
                        gint         xsrc,
                        gint         ysrc,
                        gint         xdest,
                        gint         ydest,
                        gint         width,
                        gint         height)
{
    wxCHECK_RET( drawable, wxT("NULL drawable in gdk_wx_draw_bitmap") );
    wxCHECK_RET( src, wxT("NULL src in gdk_wx_draw_bitmap") );
    wxCHECK_RET( gc, wxT("NULL gc in gdk_wx_draw_bitmap") );

    GdkWindowPrivate *drawable_private;
    GdkWindowPrivate *src_private;
    GdkGCPrivate *gc_private;

    drawable_private = (GdkWindowPrivate*) drawable;
    src_private = (GdkWindowPrivate*) src;
    if (drawable_private->destroyed || src_private->destroyed)
        return;

    gint src_width = src_private->width;
    gint src_height = src_private->height;

    gc_private = (GdkGCPrivate*) gc;

    if (width == -1) width = src_width;
    if (height == -1) height = src_height;

    XCopyPlane( drawable_private->xdisplay,
                src_private->xwindow,
                drawable_private->xwindow,
                gc_private->xgc,
                xsrc, ysrc,
                width, height,
                xdest, ydest,
                1 );
}

//-----------------------------------------------------------------------------
// Implement Pool of Graphic contexts. Creating them takes too much time.
//-----------------------------------------------------------------------------

enum wxPoolGCType
{
   wxGC_ERROR = 0,
   wxTEXT_MONO,
   wxBG_MONO,
   wxPEN_MONO,
   wxBRUSH_MONO,
   wxTEXT_COLOUR,
   wxBG_COLOUR,
   wxPEN_COLOUR,
   wxBRUSH_COLOUR,
   wxTEXT_SCREEN,
   wxBG_SCREEN,
   wxPEN_SCREEN,
   wxBRUSH_SCREEN
};

struct wxGC
{
    GdkGC        *m_gc;
    wxPoolGCType  m_type;
    bool          m_used;
};

#define GC_POOL_ALLOC_SIZE 100

static int wxGCPoolSize = 0;

static wxGC *wxGCPool = NULL;

static void wxInitGCPool()
{
    // This really could wait until the first call to
    // wxGetPoolGC, but we will make the first allocation
    // now when other initialization is being performed.

    // Set initial pool size.
    wxGCPoolSize = GC_POOL_ALLOC_SIZE;

    // Allocate initial pool.
    wxGCPool = (wxGC *)malloc(wxGCPoolSize * sizeof(wxGC));
    if (wxGCPool == NULL)
    {
        // If we cannot malloc, then fail with error
        // when debug is enabled.  If debug is not enabled,
        // the problem will eventually get caught
        // in wxGetPoolGC.
        wxFAIL_MSG( wxT("Cannot allocate GC pool") );
        return;
    }

    // Zero initial pool.
    memset(wxGCPool, 0, wxGCPoolSize * sizeof(wxGC));
}

static void wxCleanUpGCPool()
{
    for (int i = 0; i < wxGCPoolSize; i++)
    {
        if (wxGCPool[i].m_gc)
            gdk_gc_unref( wxGCPool[i].m_gc );
    }

    free(wxGCPool);
    wxGCPool = NULL;
    wxGCPoolSize = 0;
}

static GdkGC* wxGetPoolGC( GdkWindow *window, wxPoolGCType type )
{
    wxGC *pptr;

    // Look for an available GC.
    for (int i = 0; i < wxGCPoolSize; i++)
    {
        if (!wxGCPool[i].m_gc)
        {
            wxGCPool[i].m_gc = gdk_gc_new( window );
            gdk_gc_set_exposures( wxGCPool[i].m_gc, FALSE );
            wxGCPool[i].m_type = type;
            wxGCPool[i].m_used = false;
        }
        if ((!wxGCPool[i].m_used) && (wxGCPool[i].m_type == type))
        {
            wxGCPool[i].m_used = true;
            return wxGCPool[i].m_gc;
        }
    }

    // We did not find an available GC.
    // We need to grow the GC pool.
    pptr = (wxGC *)realloc(wxGCPool,
        (wxGCPoolSize + GC_POOL_ALLOC_SIZE)*sizeof(wxGC));
    if (pptr != NULL)
    {
        // Initialize newly allocated pool.
        wxGCPool = pptr;
        memset(&wxGCPool[wxGCPoolSize], 0,
            GC_POOL_ALLOC_SIZE*sizeof(wxGC));

        // Initialize entry we will return.
        wxGCPool[wxGCPoolSize].m_gc = gdk_gc_new( window );
        gdk_gc_set_exposures( wxGCPool[wxGCPoolSize].m_gc, FALSE );
        wxGCPool[wxGCPoolSize].m_type = type;
        wxGCPool[wxGCPoolSize].m_used = true;

        // Set new value of pool size.
        wxGCPoolSize += GC_POOL_ALLOC_SIZE;

        // Return newly allocated entry.
        return wxGCPool[wxGCPoolSize-GC_POOL_ALLOC_SIZE].m_gc;
    }

    // The realloc failed.  Fall through to error.
    wxFAIL_MSG( wxT("No GC available") );

    return NULL;
}

static void wxFreePoolGC( GdkGC *gc )
{
    for (int i = 0; i < wxGCPoolSize; i++)
    {
        if (wxGCPool[i].m_gc == gc)
        {
            wxGCPool[i].m_used = false;
            return;
        }
    }

    wxFAIL_MSG( wxT("Wrong GC") );
}

//-----------------------------------------------------------------------------
// wxWindowDCImpl
//-----------------------------------------------------------------------------

IMPLEMENT_ABSTRACT_CLASS(wxWindowDCImpl, wxDC)

wxWindowDCImpl::wxWindowDCImpl(wxDC *owner)
              : wxGTKDCImpl(owner)
{
    m_penGC = NULL;
    m_brushGC = NULL;
    m_textGC = NULL;
    m_bgGC = NULL;
    m_cmap = NULL;
    m_isMemDC = false;
    m_isScreenDC = false;
    m_owner = NULL;
}

wxWindowDCImpl::wxWindowDCImpl(wxDC *owner, wxWindow *window)
              : wxGTKDCImpl(owner)
{
    wxASSERT_MSG( window, wxT("DC needs a window") );

    m_penGC = NULL;
    m_brushGC = NULL;
    m_textGC = NULL;
    m_bgGC = NULL;
    m_cmap = NULL;
    m_owner = NULL;
    m_isMemDC = false;
    m_isScreenDC = false;
    m_font = window->GetFont();

    GtkWidget *widget = window->m_wxwindow;

    // Some controls don't have m_wxwindow - like wxStaticBox, but the user
    // code should still be able to create wxClientDCs for them, so we will
    // use the parent window here then.
    if ( !widget )
    {
        window = window->GetParent();
        widget = window->m_wxwindow;
    }

    wxASSERT_MSG( widget, wxT("DC needs a widget") );

    GtkPizza *pizza = GTK_PIZZA( widget );
    m_window = pizza->bin_window;

    // Window not realized ?
    if (!m_window)
    {
         // Don't report problems as per MSW.
         m_ok = true;

         return;
    }

    m_cmap = gtk_widget_get_colormap( widget ? widget : window->m_widget );

    SetUpDC();

    /* this must be done after SetUpDC, bacause SetUpDC calls the
       repective SetBrush, SetPen, SetBackground etc functions
       to set up the DC. SetBackground call m_owner->SetBackground
       and this might not be desired as the standard dc background
       is white whereas a window might assume gray to be the
       standard (as e.g. wxStatusBar) */

    m_owner = window;
}

wxWindowDCImpl::~wxWindowDCImpl()
{
    Destroy();
}

void wxWindowDCImpl::SetUpDC()
{
    m_ok = true;

    wxASSERT_MSG( !m_penGC, wxT("GCs already created") );

    if (m_isScreenDC)
    {
        m_penGC = wxGetPoolGC( m_window, wxPEN_SCREEN );
        m_brushGC = wxGetPoolGC( m_window, wxBRUSH_SCREEN );
        m_textGC = wxGetPoolGC( m_window, wxTEXT_SCREEN );
        m_bgGC = wxGetPoolGC( m_window, wxBG_SCREEN );
    }
    else if (m_isMemDC && (((wxMemoryDCImpl*)this)->m_selected.GetDepth() == 1))
    {
        m_penGC = wxGetPoolGC( m_window, wxPEN_MONO );
        m_brushGC = wxGetPoolGC( m_window, wxBRUSH_MONO );
        m_textGC = wxGetPoolGC( m_window, wxTEXT_MONO );
        m_bgGC = wxGetPoolGC( m_window, wxBG_MONO );
    }
    else
    {
        m_penGC = wxGetPoolGC( m_window, wxPEN_COLOUR );
        m_brushGC = wxGetPoolGC( m_window, wxBRUSH_COLOUR );
        m_textGC = wxGetPoolGC( m_window, wxTEXT_COLOUR );
        m_bgGC = wxGetPoolGC( m_window, wxBG_COLOUR );
    }

    /* background colour */
    m_backgroundBrush = *wxWHITE_BRUSH;
    m_backgroundBrush.GetColour().CalcPixel( m_cmap );
    GdkColor *bg_col = m_backgroundBrush.GetColour().GetColor();

    /* m_textGC */
    m_textForegroundColour.CalcPixel( m_cmap );
    gdk_gc_set_foreground( m_textGC, m_textForegroundColour.GetColor() );

    m_textBackgroundColour.CalcPixel( m_cmap );
    gdk_gc_set_background( m_textGC, m_textBackgroundColour.GetColor() );

    gdk_gc_set_fill( m_textGC, GDK_SOLID );

    /* m_penGC */
    m_pen.GetColour().CalcPixel( m_cmap );
    gdk_gc_set_foreground( m_penGC, m_pen.GetColour().GetColor() );
    gdk_gc_set_background( m_penGC, bg_col );

    gdk_gc_set_line_attributes( m_penGC, 0, GDK_LINE_SOLID, GDK_CAP_NOT_LAST, GDK_JOIN_ROUND );

    /* m_brushGC */
    m_brush.GetColour().CalcPixel( m_cmap );
    gdk_gc_set_foreground( m_brushGC, m_brush.GetColour().GetColor() );
    gdk_gc_set_background( m_brushGC, bg_col );

    gdk_gc_set_fill( m_brushGC, GDK_SOLID );

    /* m_bgGC */
    gdk_gc_set_background( m_bgGC, bg_col );
    gdk_gc_set_foreground( m_bgGC, bg_col );

    gdk_gc_set_fill( m_bgGC, GDK_SOLID );

    /* ROPs */
    gdk_gc_set_function( m_textGC, GDK_COPY );
    gdk_gc_set_function( m_brushGC, GDK_COPY );
    gdk_gc_set_function( m_penGC, GDK_COPY );

    /* clipping */
    gdk_gc_set_clip_rectangle( m_penGC, NULL );
    gdk_gc_set_clip_rectangle( m_brushGC, NULL );
    gdk_gc_set_clip_rectangle( m_textGC, NULL );
    gdk_gc_set_clip_rectangle( m_bgGC, NULL );

    if (!hatch_bitmap)
    {
        hatch_bitmap    = hatches;
        hatch_bitmap[0] = gdk_bitmap_create_from_data( NULL, bdiag_bits, bdiag_width, bdiag_height );
        hatch_bitmap[1] = gdk_bitmap_create_from_data( NULL, cdiag_bits, cdiag_width, cdiag_height );
        hatch_bitmap[2] = gdk_bitmap_create_from_data( NULL, fdiag_bits, fdiag_width, fdiag_height );
        hatch_bitmap[3] = gdk_bitmap_create_from_data( NULL, cross_bits, cross_width, cross_height );
        hatch_bitmap[4] = gdk_bitmap_create_from_data( NULL, horiz_bits, horiz_width, horiz_height );
        hatch_bitmap[5] = gdk_bitmap_create_from_data( NULL, verti_bits, verti_width, verti_height );
    }
}

void wxWindowDCImpl::DoGetSize( int* width, int* height ) const
{
    wxCHECK_RET( m_owner, wxT("GetSize() doesn't work without window") );

    m_owner->GetSize(width, height);
}

extern bool wxDoFloodFill(wxDC *dc, wxCoord x, wxCoord y,
                          const wxColour & col, wxFloodFillStyle style);

bool wxWindowDCImpl::DoFloodFill(wxCoord x, wxCoord y,
                             const wxColour& col, wxFloodFillStyle style)
{
    return wxDoFloodFill(GetOwner(), x, y, col, style);
}

bool wxWindowDCImpl::DoGetPixel( wxCoord x1, wxCoord y1, wxColour *col ) const
{
    // Generic (and therefore rather inefficient) method.
    // Could be improved.
    wxMemoryDC memdc;
    wxBitmap bitmap(1, 1);
    memdc.SelectObject(bitmap);
    memdc.Blit(0, 0, 1, 1, GetOwner(), x1, y1);
    memdc.SelectObject(wxNullBitmap);

    wxImage image = bitmap.ConvertToImage();
    col->Set(image.GetRed(0, 0), image.GetGreen(0, 0), image.GetBlue(0, 0));
    return true;
}

void wxWindowDCImpl::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    if (m_pen.GetStyle() != wxTRANSPARENT)
    {
        if (m_window)
            gdk_draw_line( m_window, m_penGC, XLOG2DEV(x1), YLOG2DEV(y1), XLOG2DEV(x2), YLOG2DEV(y2) );

        CalcBoundingBox(x1, y1);
        CalcBoundingBox(x2, y2);
    }
}

void wxWindowDCImpl::DoCrossHair( wxCoord x, wxCoord y )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    if (m_pen.GetStyle() != wxTRANSPARENT)
    {
        int w = 0;
        int h = 0;
        GetSize( &w, &h );
        wxCoord xx = XLOG2DEV(x);
        wxCoord yy = YLOG2DEV(y);
        if (m_window)
        {
            gdk_draw_line( m_window, m_penGC, 0, yy, XLOG2DEVREL(w), yy );
            gdk_draw_line( m_window, m_penGC, xx, 0, xx, YLOG2DEVREL(h) );
        }
    }
}

void wxWindowDCImpl::DoDrawArc( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2,
                            wxCoord xc, wxCoord yc )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    wxCoord xx1 = XLOG2DEV(x1);
    wxCoord yy1 = YLOG2DEV(y1);
    wxCoord xx2 = XLOG2DEV(x2);
    wxCoord yy2 = YLOG2DEV(y2);
    wxCoord xxc = XLOG2DEV(xc);
    wxCoord yyc = YLOG2DEV(yc);
    double dx = xx1 - xxc;
    double dy = yy1 - yyc;
    double radius = sqrt((double)(dx*dx+dy*dy));
    wxCoord   r      = (wxCoord)radius;
    double radius1, radius2;

    if (xx1 == xx2 && yy1 == yy2)
    {
        radius1 = 0.0;
        radius2 = 360.0;
    }
    else if ( wxIsNullDouble(radius) )
    {
        radius1 =
        radius2 = 0.0;
    }
    else
    {
        radius1 = (xx1 - xxc == 0) ?
            (yy1 - yyc < 0) ? 90.0 : -90.0 :
            -atan2(double(yy1-yyc), double(xx1-xxc)) * RAD2DEG;
        radius2 = (xx2 - xxc == 0) ?
            (yy2 - yyc < 0) ? 90.0 : -90.0 :
            -atan2(double(yy2-yyc), double(xx2-xxc)) * RAD2DEG;
    }
    wxCoord alpha1 = wxCoord(radius1 * 64.0);
    wxCoord alpha2 = wxCoord((radius2 - radius1) * 64.0);
    while (alpha2 <= 0) alpha2 += 360*64;
    while (alpha1 > 360*64) alpha1 -= 360*64;

    if (m_window)
    {
        if (m_brush.GetStyle() != wxTRANSPARENT)
        {
            if ((m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE) && (m_brush.GetStipple()->GetMask()))
            {
                gdk_gc_set_ts_origin( m_textGC,
                                      m_deviceOriginX % m_brush.GetStipple()->GetWidth(),
                                      m_deviceOriginY % m_brush.GetStipple()->GetHeight() );
                gdk_draw_arc( m_window, m_textGC, TRUE, xxc-r, yyc-r, 2*r,2*r, alpha1, alpha2 );
                gdk_gc_set_ts_origin( m_textGC, 0, 0 );
            } else
            if (IS_15_PIX_HATCH(m_brush.GetStyle()))
            {
                gdk_gc_set_ts_origin( m_brushGC, m_deviceOriginX % 15, m_deviceOriginY % 15 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xxc-r, yyc-r, 2*r,2*r, alpha1, alpha2 );
                gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
            } else
            if (IS_16_PIX_HATCH(m_brush.GetStyle()))
            {
                gdk_gc_set_ts_origin( m_brushGC, m_deviceOriginX % 16, m_deviceOriginY % 16 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xxc-r, yyc-r, 2*r,2*r, alpha1, alpha2 );
                gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
            } else
            if (m_brush.GetStyle() == wxSTIPPLE)
            {
                gdk_gc_set_ts_origin( m_brushGC,
                                      m_deviceOriginX % m_brush.GetStipple()->GetWidth(),
                                      m_deviceOriginY % m_brush.GetStipple()->GetHeight() );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xxc-r, yyc-r, 2*r,2*r, alpha1, alpha2 );
                gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
            }
            else
            {
                gdk_draw_arc( m_window, m_brushGC, TRUE, xxc-r, yyc-r, 2*r,2*r, alpha1, alpha2 );
            }
        }

        if (m_pen.GetStyle() != wxTRANSPARENT)
        {
            gdk_draw_arc( m_window, m_penGC, FALSE, xxc-r, yyc-r, 2*r,2*r, alpha1, alpha2 );

            gdk_draw_line( m_window, m_penGC, xx1, yy1, xxc, yyc );
            gdk_draw_line( m_window, m_penGC, xxc, yyc, xx2, yy2 );
        }
    }

    CalcBoundingBox (x1, y1);
    CalcBoundingBox (x2, y2);
}

void wxWindowDCImpl::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord width, wxCoord height, double sa, double ea )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    wxCoord xx = XLOG2DEV(x);
    wxCoord yy = YLOG2DEV(y);
    wxCoord ww = m_signX * XLOG2DEVREL(width);
    wxCoord hh = m_signY * YLOG2DEVREL(height);

    // CMB: handle -ve width and/or height
    if (ww < 0) { ww = -ww; xx = xx - ww; }
    if (hh < 0) { hh = -hh; yy = yy - hh; }

    if (m_window)
    {
        wxCoord start = wxCoord(sa * 64.0);
        wxCoord end = wxCoord((ea-sa) * 64.0);

        if (m_brush.GetStyle() != wxTRANSPARENT)
        {
            if ((m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE) && (m_brush.GetStipple()->GetMask()))
            {
                gdk_gc_set_ts_origin( m_textGC,
                                      m_deviceOriginX % m_brush.GetStipple()->GetWidth(),
                                      m_deviceOriginY % m_brush.GetStipple()->GetHeight() );
                gdk_draw_arc( m_window, m_textGC, TRUE, xx, yy, ww, hh, start, end );
                gdk_gc_set_ts_origin( m_textGC, 0, 0 );
            } else
            if (IS_15_PIX_HATCH(m_brush.GetStyle()))
            {
                gdk_gc_set_ts_origin( m_brushGC, m_deviceOriginX % 15, m_deviceOriginY % 15 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, ww, hh, start, end );
                gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
            } else
            if (IS_16_PIX_HATCH(m_brush.GetStyle()))
            {
                gdk_gc_set_ts_origin( m_brushGC, m_deviceOriginX % 16, m_deviceOriginY % 16 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, ww, hh, start, end );
                gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
            } else
            if (m_brush.GetStyle() == wxSTIPPLE)
            {
                gdk_gc_set_ts_origin( m_brushGC,
                                      m_deviceOriginX % m_brush.GetStipple()->GetWidth(),
                                      m_deviceOriginY % m_brush.GetStipple()->GetHeight() );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, ww, hh, start, end );
                gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
            }
            else
            {
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, ww, hh, start, end );
            }
        }

        if (m_pen.GetStyle() != wxTRANSPARENT)
            gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy, ww, hh, start, end );
    }

    CalcBoundingBox (x, y);
    CalcBoundingBox (x + width, y + height);
}

void wxWindowDCImpl::DoDrawPoint( wxCoord x, wxCoord y )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    if ((m_pen.GetStyle() != wxTRANSPARENT) && m_window)
        gdk_draw_point( m_window, m_penGC, XLOG2DEV(x), YLOG2DEV(y) );

    CalcBoundingBox (x, y);
}

void wxWindowDCImpl::DoDrawLines( int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    if (m_pen.GetStyle() == wxTRANSPARENT) return;
    if (n <= 0) return;


    GdkPoint * const gpts = new GdkPoint[n];
    if ( !gpts )
    {
        wxFAIL_MSG( wxT("Cannot allocate PolyLine") );
        return;
    }

    for (int i = 0; i < n; i++)
    {
        wxCoord x = points[i].x + xoffset,
                y = points[i].y + yoffset;

        CalcBoundingBox(x + xoffset, y + yoffset);

        gpts[i].x = XLOG2DEV(x);
        gpts[i].y = YLOG2DEV(y);
    }

    gdk_draw_lines( m_window, m_penGC, gpts, n);

    delete[] gpts;
}

void wxWindowDCImpl::DoDrawPolygon( int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset, wxPolygonFillMode WXUNUSED(fillStyle) )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    if (n <= 0) return;

    GdkPoint * const gpts = new GdkPoint[n];

    for (int i = 0 ; i < n ; i++)
    {
        wxCoord x = points[i].x + xoffset,
                y = points[i].y + yoffset;

        CalcBoundingBox(x + xoffset, y + yoffset);

        gpts[i].x = XLOG2DEV(x);
        gpts[i].y = YLOG2DEV(y);
    }

    if (m_brush.GetStyle() == wxSOLID)
    {
        gdk_draw_polygon( m_window, m_brushGC, TRUE, gpts, n );
    }
    else if (m_brush.GetStyle() != wxTRANSPARENT)
    {
        if ((m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE) && (m_brush.GetStipple()->GetMask()))
        {
            gdk_gc_set_ts_origin( m_textGC,
                                  m_deviceOriginX % m_brush.GetStipple()->GetWidth(),
                                  m_deviceOriginY % m_brush.GetStipple()->GetHeight() );
            gdk_draw_polygon( m_window, m_textGC, TRUE, gpts, n );
            gdk_gc_set_ts_origin( m_textGC, 0, 0 );
        } else
        if (IS_15_PIX_HATCH(m_brush.GetStyle()))
        {
            gdk_gc_set_ts_origin( m_brushGC, m_deviceOriginX % 15, m_deviceOriginY % 15 );
            gdk_draw_polygon( m_window, m_brushGC, TRUE, gpts, n );
            gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
        } else
        if (IS_16_PIX_HATCH(m_brush.GetStyle()))
        {
            gdk_gc_set_ts_origin( m_brushGC, m_deviceOriginX % 16, m_deviceOriginY % 16 );
            gdk_draw_polygon( m_window, m_brushGC, TRUE, gpts, n );
            gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
        } else
        if (m_brush.GetStyle() == wxSTIPPLE)
        {
            gdk_gc_set_ts_origin( m_brushGC,
                                  m_deviceOriginX % m_brush.GetStipple()->GetWidth(),
                                  m_deviceOriginY % m_brush.GetStipple()->GetHeight() );
            gdk_draw_polygon( m_window, m_brushGC, TRUE, gpts, n );
            gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
        }
        else
        {
            gdk_draw_polygon( m_window, m_brushGC, TRUE, gpts, n );
        }
    }

    if (m_pen.GetStyle() != wxTRANSPARENT)
    {
        gdk_draw_polygon( m_window, m_penGC, FALSE, gpts, n );

    }

    delete[] gpts;
}

void wxWindowDCImpl::DoDrawRectangle( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    wxCoord xx = XLOG2DEV(x);
    wxCoord yy = YLOG2DEV(y);
    wxCoord ww = m_signX * XLOG2DEVREL(width);
    wxCoord hh = m_signY * YLOG2DEVREL(height);

    // CMB: draw nothing if transformed w or h is 0
    if (ww == 0 || hh == 0) return;

    // CMB: handle -ve width and/or height
    if (ww < 0) { ww = -ww; xx = xx - ww; }
    if (hh < 0) { hh = -hh; yy = yy - hh; }

    if (m_window)
    {
        if (m_brush.GetStyle() != wxTRANSPARENT)
        {
            if ((m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE) && (m_brush.GetStipple()->GetMask()))
            {
                gdk_gc_set_ts_origin( m_textGC,
                                      m_deviceOriginX % m_brush.GetStipple()->GetWidth(),
                                      m_deviceOriginY % m_brush.GetStipple()->GetHeight() );
                gdk_draw_rectangle( m_window, m_textGC, TRUE, xx, yy, ww, hh );
                gdk_gc_set_ts_origin( m_textGC, 0, 0 );
            } else
            if (IS_15_PIX_HATCH(m_brush.GetStyle()))
            {
                gdk_gc_set_ts_origin( m_brushGC, m_deviceOriginX % 15, m_deviceOriginY % 15 );
                gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx, yy, ww, hh );
                gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
            } else
            if (IS_16_PIX_HATCH(m_brush.GetStyle()))
            {
                gdk_gc_set_ts_origin( m_brushGC, m_deviceOriginX % 16, m_deviceOriginY % 16 );
                gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx, yy, ww, hh );
                gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
            } else
            if (m_brush.GetStyle() == wxSTIPPLE)
            {
                gdk_gc_set_ts_origin( m_brushGC,
                                      m_deviceOriginX % m_brush.GetStipple()->GetWidth(),
                                      m_deviceOriginY % m_brush.GetStipple()->GetHeight() );
                gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx, yy, ww, hh );
                gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
            }
            else
            {
                gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx, yy, ww, hh );
            }
        }

        if (m_pen.GetStyle() != wxTRANSPARENT)
            gdk_draw_rectangle( m_window, m_penGC, FALSE, xx, yy, ww-1, hh-1 );
    }

    CalcBoundingBox( x, y );
    CalcBoundingBox( x + width, y + height );
}

void wxWindowDCImpl::DoDrawRoundedRectangle( wxCoord x, wxCoord y, wxCoord width, wxCoord height, double radius )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    if (radius < 0.0) radius = - radius * ((width < height) ? width : height);

    wxCoord xx = XLOG2DEV(x);
    wxCoord yy = YLOG2DEV(y);
    wxCoord ww = m_signX * XLOG2DEVREL(width);
    wxCoord hh = m_signY * YLOG2DEVREL(height);
    wxCoord rr = XLOG2DEVREL((wxCoord)radius);

    // CMB: handle -ve width and/or height
    if (ww < 0) { ww = -ww; xx = xx - ww; }
    if (hh < 0) { hh = -hh; yy = yy - hh; }

    // CMB: if radius is zero use DrawRectangle() instead to avoid
    // X drawing errors with small radii
    if (rr == 0)
    {
        DoDrawRectangle( x, y, width, height );
        return;
    }

    // CMB: draw nothing if transformed w or h is 0
    if (ww == 0 || hh == 0) return;

    // CMB: adjust size if outline is drawn otherwise the result is
    // 1 pixel too wide and high
    if (m_pen.GetStyle() != wxTRANSPARENT)
    {
        ww--;
        hh--;
    }

    if (m_window)
    {
        // CMB: ensure dd is not larger than rectangle otherwise we
        // get an hour glass shape
        wxCoord dd = 2 * rr;
        if (dd > ww) dd = ww;
        if (dd > hh) dd = hh;
        rr = dd / 2;

        if (m_brush.GetStyle() != wxTRANSPARENT)
        {
            if ((m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE) && (m_brush.GetStipple()->GetMask()))
            {
                gdk_gc_set_ts_origin( m_textGC,
                                      m_deviceOriginX % m_brush.GetStipple()->GetWidth(),
                                      m_deviceOriginY % m_brush.GetStipple()->GetHeight() );
                gdk_draw_rectangle( m_window, m_textGC, TRUE, xx+rr, yy, ww-dd+1, hh );
                gdk_draw_rectangle( m_window, m_textGC, TRUE, xx, yy+rr, ww, hh-dd+1 );
                gdk_draw_arc( m_window, m_textGC, TRUE, xx, yy, dd, dd, 90*64, 90*64 );
                gdk_draw_arc( m_window, m_textGC, TRUE, xx+ww-dd, yy, dd, dd, 0, 90*64 );
                gdk_draw_arc( m_window, m_textGC, TRUE, xx+ww-dd, yy+hh-dd, dd, dd, 270*64, 90*64 );
                gdk_draw_arc( m_window, m_textGC, TRUE, xx, yy+hh-dd, dd, dd, 180*64, 90*64 );
                gdk_gc_set_ts_origin( m_textGC, 0, 0 );
            } else
            if (IS_15_PIX_HATCH(m_brush.GetStyle()))
            {
                gdk_gc_set_ts_origin( m_brushGC, m_deviceOriginX % 15, m_deviceOriginY % 15 );
                gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx+rr, yy, ww-dd+1, hh );
                gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx, yy+rr, ww, hh-dd+1 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, dd, dd, 90*64, 90*64 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx+ww-dd, yy, dd, dd, 0, 90*64 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx+ww-dd, yy+hh-dd, dd, dd, 270*64, 90*64 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy+hh-dd, dd, dd, 180*64, 90*64 );
                gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
            } else
            if (IS_16_PIX_HATCH(m_brush.GetStyle()))
            {
                gdk_gc_set_ts_origin( m_brushGC, m_deviceOriginX % 16, m_deviceOriginY % 16 );
                gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx+rr, yy, ww-dd+1, hh );
                gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx, yy+rr, ww, hh-dd+1 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, dd, dd, 90*64, 90*64 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx+ww-dd, yy, dd, dd, 0, 90*64 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx+ww-dd, yy+hh-dd, dd, dd, 270*64, 90*64 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy+hh-dd, dd, dd, 180*64, 90*64 );
                gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
            } else
            if (m_brush.GetStyle() == wxSTIPPLE)
            {
                gdk_gc_set_ts_origin( m_brushGC,
                                      m_deviceOriginX % m_brush.GetStipple()->GetWidth(),
                                      m_deviceOriginY % m_brush.GetStipple()->GetHeight() );
                gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx+rr, yy, ww-dd+1, hh );
                gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx, yy+rr, ww, hh-dd+1 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, dd, dd, 90*64, 90*64 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx+ww-dd, yy, dd, dd, 0, 90*64 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx+ww-dd, yy+hh-dd, dd, dd, 270*64, 90*64 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy+hh-dd, dd, dd, 180*64, 90*64 );
                gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
            }
            else
            {
                gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx+rr, yy, ww-dd+1, hh );
                gdk_draw_rectangle( m_window, m_brushGC, TRUE, xx, yy+rr, ww, hh-dd+1 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, dd, dd, 90*64, 90*64 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx+ww-dd, yy, dd, dd, 0, 90*64 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx+ww-dd, yy+hh-dd, dd, dd, 270*64, 90*64 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy+hh-dd, dd, dd, 180*64, 90*64 );
            }
        }

        if (m_pen.GetStyle() != wxTRANSPARENT)
        {
            gdk_draw_line( m_window, m_penGC, xx+rr+1, yy, xx+ww-rr, yy );
            gdk_draw_line( m_window, m_penGC, xx+rr+1, yy+hh, xx+ww-rr, yy+hh );
            gdk_draw_line( m_window, m_penGC, xx, yy+rr+1, xx, yy+hh-rr );
            gdk_draw_line( m_window, m_penGC, xx+ww, yy+rr+1, xx+ww, yy+hh-rr );
            gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy, dd, dd, 90*64, 90*64 );
            gdk_draw_arc( m_window, m_penGC, FALSE, xx+ww-dd, yy, dd, dd, 0, 90*64 );
            gdk_draw_arc( m_window, m_penGC, FALSE, xx+ww-dd, yy+hh-dd, dd, dd, 270*64, 90*64 );
            gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy+hh-dd, dd, dd, 180*64, 90*64 );
        }
    }

    // this ignores the radius
    CalcBoundingBox( x, y );
    CalcBoundingBox( x + width, y + height );
}

void wxWindowDCImpl::DoDrawEllipse( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    wxCoord xx = XLOG2DEV(x);
    wxCoord yy = YLOG2DEV(y);
    wxCoord ww = m_signX * XLOG2DEVREL(width);
    wxCoord hh = m_signY * YLOG2DEVREL(height);

    // CMB: handle -ve width and/or height
    if (ww < 0) { ww = -ww; xx = xx - ww; }
    if (hh < 0) { hh = -hh; yy = yy - hh; }

    if (m_window)
    {
        if (m_brush.GetStyle() != wxTRANSPARENT)
        {
            if ((m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE) && (m_brush.GetStipple()->GetMask()))
            {
                gdk_gc_set_ts_origin( m_textGC,
                                      m_deviceOriginX % m_brush.GetStipple()->GetWidth(),
                                      m_deviceOriginY % m_brush.GetStipple()->GetHeight() );
                gdk_draw_arc( m_window, m_textGC, TRUE, xx, yy, ww, hh, 0, 360*64 );
                gdk_gc_set_ts_origin( m_textGC, 0, 0 );
            } else
            if (IS_15_PIX_HATCH(m_brush.GetStyle()))
            {
                gdk_gc_set_ts_origin( m_brushGC, m_deviceOriginX % 15, m_deviceOriginY % 15 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, ww, hh, 0, 360*64 );
                gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
            } else
            if (IS_16_PIX_HATCH(m_brush.GetStyle()))
            {
                gdk_gc_set_ts_origin( m_brushGC, m_deviceOriginX % 16, m_deviceOriginY % 16 );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, ww, hh, 0, 360*64 );
                gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
            } else
            if (m_brush.GetStyle() == wxSTIPPLE)
            {
                gdk_gc_set_ts_origin( m_brushGC,
                                      m_deviceOriginX % m_brush.GetStipple()->GetWidth(),
                                      m_deviceOriginY % m_brush.GetStipple()->GetHeight() );
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, ww, hh, 0, 360*64 );
                gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
            }
            else
            {
                gdk_draw_arc( m_window, m_brushGC, TRUE, xx, yy, ww, hh, 0, 360*64 );
            }
        }

        if (m_pen.GetStyle() != wxTRANSPARENT)
            gdk_draw_arc( m_window, m_penGC, FALSE, xx, yy, ww, hh, 0, 360*64 );
    }

    CalcBoundingBox( x, y );
    CalcBoundingBox( x + width, y + height );
}

void wxWindowDCImpl::DoDrawIcon( const wxIcon &icon, wxCoord x, wxCoord y )
{
    // VZ: egcs 1.0.3 refuses to compile this without cast, no idea why
    DoDrawBitmap( (const wxBitmap&)icon, x, y, true );
}

void wxWindowDCImpl::DoDrawBitmap( const wxBitmap &bitmap,
                               wxCoord x, wxCoord y,
                               bool useMask )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    wxCHECK_RET( bitmap.IsOk(), wxT("invalid bitmap") );

    bool is_mono = (bitmap.GetBitmap() != NULL);

    // scale/translate size and position
    int xx = XLOG2DEV(x);
    int yy = YLOG2DEV(y);

    int w = bitmap.GetWidth();
    int h = bitmap.GetHeight();

    CalcBoundingBox( x, y );
    CalcBoundingBox( x + w, y + h );

    if (!m_window) return;

    int ww = XLOG2DEVREL(w);
    int hh = YLOG2DEVREL(h);

    // compare to current clipping region
    if (!m_currentClippingRegion.IsNull())
    {
        wxRegion tmp( xx,yy,ww,hh );
        tmp.Intersect( m_currentClippingRegion );
        if (tmp.IsEmpty())
            return;
    }

    // scale bitmap if required
    wxBitmap use_bitmap = bitmap;
    if ((w != ww) || (h != hh))
        use_bitmap = use_bitmap.Rescale( 0, 0, ww, hh, ww, hh );

    // NB: We can't render pixbufs with GTK+ < 2.2, we need to use pixmaps code.
    //     Pixbufs-based bitmaps with alpha channel don't have a mask, so we
    //     have to call GetPixmap() here -- it converts the pixbuf into pixmap
    //     and also creates the mask as a side-effect:
    use_bitmap.GetPixmap();

    // apply mask if any
    GdkBitmap *mask = NULL;
    if (use_bitmap.GetMask()) mask = use_bitmap.GetMask()->GetBitmap();

    GdkBitmap *new_mask = NULL;

    if (useMask && mask)
    {
        if (!m_currentClippingRegion.IsNull())
        {
            GdkColor col;
            new_mask = gdk_pixmap_new( wxGetRootWindow()->window, ww, hh, 1 );
            GdkGC *gc = gdk_gc_new( new_mask );
            col.pixel = 0;
            gdk_gc_set_foreground( gc, &col );
            gdk_draw_rectangle( new_mask, gc, TRUE, 0, 0, ww, hh );
            col.pixel = 0;
            gdk_gc_set_background( gc, &col );
            col.pixel = 1;
            gdk_gc_set_foreground( gc, &col );
            gdk_gc_set_clip_region( gc, m_currentClippingRegion.GetRegion() );
            gdk_gc_set_clip_origin( gc, -xx, -yy );
            gdk_gc_set_fill( gc, GDK_OPAQUE_STIPPLED );
            gdk_gc_set_stipple( gc, mask );
            gdk_draw_rectangle( new_mask, gc, TRUE, 0, 0, ww, hh );
            gdk_gc_unref( gc );
        }

        if (is_mono)
        {
            if (new_mask)
                gdk_gc_set_clip_mask( m_textGC, new_mask );
            else
                gdk_gc_set_clip_mask( m_textGC, mask );
            gdk_gc_set_clip_origin( m_textGC, xx, yy );
        }
        else
        {
            if (new_mask)
                gdk_gc_set_clip_mask( m_penGC, new_mask );
            else
                gdk_gc_set_clip_mask( m_penGC, mask );
            gdk_gc_set_clip_origin( m_penGC, xx, yy );
        }
    }

    // Draw XPixmap or XBitmap, depending on what the wxBitmap contains. For
    // drawing a mono-bitmap (XBitmap) we use the current text GC
    if (is_mono)
    {
        gdk_wx_draw_bitmap( m_window, m_textGC, use_bitmap.GetBitmap(), 0, 0, xx, yy, -1, -1 );
    }
    else
    {
        gdk_draw_pixmap(m_window, m_penGC,
                        use_bitmap.GetPixmap(),
                        0, 0, xx, yy, -1, -1);
    }

    // remove mask again if any
    if (useMask && mask)
    {
        if (is_mono)
        {
            gdk_gc_set_clip_mask( m_textGC, NULL );
            gdk_gc_set_clip_origin( m_textGC, 0, 0 );
            if (!m_currentClippingRegion.IsNull())
                gdk_gc_set_clip_region( m_textGC, m_currentClippingRegion.GetRegion() );
        }
        else
        {
            gdk_gc_set_clip_mask( m_penGC, NULL );
            gdk_gc_set_clip_origin( m_penGC, 0, 0 );
            if (!m_currentClippingRegion.IsNull())
                gdk_gc_set_clip_region( m_penGC, m_currentClippingRegion.GetRegion() );
        }
    }

    if (new_mask)
        gdk_bitmap_unref( new_mask );
}

bool wxWindowDCImpl::DoBlit( wxCoord xdest, wxCoord ydest,
                             wxCoord width, wxCoord height,
                             wxDC *source,
                             wxCoord xsrc, wxCoord ysrc,
                             wxRasterOperationMode logical_func,
                             bool useMask,
                             wxCoord xsrcMask, wxCoord ysrcMask )
{
    wxCHECK_MSG( IsOk(), false, wxT("invalid window dc") );

    wxCHECK_MSG( source, false, wxT("invalid source dc") );

    if (!m_window) return false;

    // transform the source DC coords to the device ones
    xsrc = source->LogicalToDeviceX(xsrc);
    ysrc = source->LogicalToDeviceY(ysrc);

    wxWindowDCImpl *srcDC = wxDynamicCast(source->GetImpl(), wxWindowDCImpl);
    wxCHECK_MSG( srcDC, false, "source must be a window DC" );

    // FIXME: this cast is not always valid, see the code using m_isMemDC
    wxMemoryDCImpl *memDC = static_cast<wxMemoryDCImpl *>(srcDC);

    bool use_bitmap_method = false;
    bool is_mono = false;

    if (xsrcMask == -1 && ysrcMask == -1)
    {
        xsrcMask = xsrc;
        ysrcMask = ysrc;
    }

    if (srcDC->m_isMemDC)
    {
        if (!memDC->m_selected.IsOk()) return false;

        is_mono = (memDC->m_selected.GetDepth() == 1);

        // we use the "XCopyArea" way to copy a memory dc into
        // a different window if the memory dc BOTH
        // a) doesn't have any mask or its mask isn't used
        // b) it is clipped
        // c) is not 1-bit

        if (useMask && (memDC->m_selected.GetMask()))
        {
            // we HAVE TO use the direct way for memory dcs
            // that have mask since the XCopyArea doesn't know
            // about masks
            use_bitmap_method = true;
        }
        else if (is_mono)
        {
            // we HAVE TO use the direct way for memory dcs
            // that are bitmaps because XCopyArea doesn't cope
            // with different bit depths
            use_bitmap_method = true;
        }
        else if ((xsrc == 0) && (ysrc == 0) &&
                 (width == memDC->m_selected.GetWidth()) &&
                 (height == memDC->m_selected.GetHeight()))
        {
            // we SHOULD use the direct way if all of the bitmap
            // in the memory dc is copied in which case XCopyArea
            // wouldn't be able able to boost performace by reducing
            // the area to be scaled
            use_bitmap_method = true;
        }
        else
        {
            use_bitmap_method = false;
        }
    }

    CalcBoundingBox( xdest, ydest );
    CalcBoundingBox( xdest + width, ydest + height );

    // scale/translate size and position
    wxCoord xx = XLOG2DEV(xdest);
    wxCoord yy = YLOG2DEV(ydest);

    wxCoord ww = XLOG2DEVREL(width);
    wxCoord hh = YLOG2DEVREL(height);

    // compare to current clipping region
    if (!m_currentClippingRegion.IsNull())
    {
        wxRegion tmp( xx,yy,ww,hh );
        tmp.Intersect( m_currentClippingRegion );
        if (tmp.IsEmpty())
            return true;
    }

    wxRasterOperationMode old_logical_func = m_logicalFunction;
    SetLogicalFunction( logical_func );

    if (use_bitmap_method)
    {
        // scale/translate bitmap size
        wxCoord bm_width = memDC->m_selected.GetWidth();
        wxCoord bm_height = memDC->m_selected.GetHeight();

        // Get clip coords for the bitmap. If we don't
        // use wxBitmap::Rescale(), which can clip the
        // bitmap, these are the same as the original
        // coordinates
        wxCoord cx = xx;
        wxCoord cy = yy;
        wxCoord cw = ww;
        wxCoord ch = hh;

        // interpret userscale of src too
        double xsc,ysc;
        memDC->GetUserScale(&xsc,&ysc);
        bm_width = (int) (bm_width / xsc);
        bm_height = (int) (bm_height / ysc);

        wxCoord bm_ww = XLOG2DEVREL( bm_width );
        wxCoord bm_hh = YLOG2DEVREL( bm_height );

        // Scale bitmap if required
        wxBitmap use_bitmap;
        if ((memDC->m_selected.GetWidth()!= bm_ww) || ( memDC->m_selected.GetHeight()!= bm_hh))
        {
            // This indicates that the blitting code below will get
            // a clipped bitmap and therefore needs to move the origin
            // accordingly
            wxRegion tmp( xx,yy,ww,hh );
            tmp.Intersect( m_currentClippingRegion );
            tmp.GetBox(cx,cy,cw,ch);

            // Scale and clipped bitmap
            use_bitmap = memDC->m_selected.Rescale(cx-xx,cy-yy,cw,ch,bm_ww,bm_hh);
        }
        else
        {
            // Don't scale bitmap
            use_bitmap = memDC->m_selected;
        }

        // apply mask if any
        GdkBitmap *mask = NULL;
        if (use_bitmap.GetMask()) mask = use_bitmap.GetMask()->GetBitmap();

        GdkBitmap *new_mask = NULL;

        if (useMask && mask)
        {
            if (!m_currentClippingRegion.IsNull())
            {
                GdkColor col;
                new_mask = gdk_pixmap_new( wxGetRootWindow()->window, bm_ww, bm_hh, 1 );
                GdkGC *gc = gdk_gc_new( new_mask );
                col.pixel = 0;
                gdk_gc_set_foreground( gc, &col );
                gdk_gc_set_ts_origin( gc, -xsrcMask, -ysrcMask);
                gdk_draw_rectangle( new_mask, gc, TRUE, 0, 0, bm_ww, bm_hh );
                col.pixel = 0;
                gdk_gc_set_background( gc, &col );
                col.pixel = 1;
                gdk_gc_set_foreground( gc, &col );
                gdk_gc_set_clip_region( gc, m_currentClippingRegion.GetRegion() );
                // was: gdk_gc_set_clip_origin( gc, -xx, -yy );
                gdk_gc_set_clip_origin( gc, -cx, -cy );
                gdk_gc_set_fill( gc, GDK_OPAQUE_STIPPLED );
                gdk_gc_set_stipple( gc, mask );
                gdk_draw_rectangle( new_mask, gc, TRUE, 0, 0, bm_ww, bm_hh );
                gdk_gc_unref( gc );
            }

            if (is_mono)
            {
                if (new_mask)
                {
                    gdk_gc_set_clip_mask( m_textGC, new_mask );
                    gdk_gc_set_clip_origin( m_textGC, cx, cy );
                }
                else
                {
                    gdk_gc_set_clip_mask( m_textGC, mask );
                    gdk_gc_set_clip_origin( m_textGC, cx-xsrcMask, cy-ysrcMask );
                }
            }
            else
            {
                if (new_mask)
                {
                    gdk_gc_set_clip_mask( m_penGC, new_mask );
                    gdk_gc_set_clip_origin( m_penGC, cx, cy );
                }
                else
                {
                    gdk_gc_set_clip_mask( m_penGC, mask );
                    gdk_gc_set_clip_origin( m_penGC, cx-xsrcMask, cy-ysrcMask );
                }
            }
        }

        // Draw XPixmap or XBitmap, depending on what the wxBitmap contains. For
        // drawing a mono-bitmap (XBitmap) we use the current text GC

        if (is_mono)
        {
            // was: gdk_wx_draw_bitmap( m_window, m_textGC, use_bitmap.GetBitmap(), xsrc, ysrc, xx, yy, ww, hh );
            gdk_wx_draw_bitmap( m_window, m_textGC, use_bitmap.GetBitmap(), xsrc, ysrc, cx, cy, cw, ch );
        }
        else
        {
            // was: gdk_draw_pixmap( m_window, m_penGC, use_bitmap.GetPixmap(), xsrc, ysrc, xx, yy, ww, hh );
            gdk_draw_pixmap( m_window, m_penGC, use_bitmap.GetPixmap(), xsrc, ysrc, cx, cy, cw, ch );
        }

        // remove mask again if any
        if (useMask && mask)
        {
            if (is_mono)
            {
                gdk_gc_set_clip_mask( m_textGC, NULL );
                gdk_gc_set_clip_origin( m_textGC, 0, 0 );
                if (!m_currentClippingRegion.IsNull())
                    gdk_gc_set_clip_region( m_textGC, m_currentClippingRegion.GetRegion() );
            }
            else
            {
                gdk_gc_set_clip_mask( m_penGC, NULL );
                gdk_gc_set_clip_origin( m_penGC, 0, 0 );
                if (!m_currentClippingRegion.IsNull())
                    gdk_gc_set_clip_region( m_penGC, m_currentClippingRegion.GetRegion() );
            }
        }

        if (new_mask)
            gdk_bitmap_unref( new_mask );
    }
    else // use_bitmap_method
    {
        if ((width != ww) || (height != hh))
        {
            // get clip coords
            wxRegion tmp( xx,yy,ww,hh );
            tmp.Intersect( m_currentClippingRegion );
            wxCoord cx,cy,cw,ch;
            tmp.GetBox(cx,cy,cw,ch);

            // rescale bitmap
            wxBitmap bitmap = memDC->m_selected.Rescale( cx-xx, cy-yy, cw, ch, ww, hh );

            // draw scaled bitmap
            // was: gdk_draw_pixmap( m_window, m_penGC, bitmap.GetPixmap(), 0, 0, xx, yy, -1, -1 );
            gdk_draw_pixmap( m_window, m_penGC, bitmap.GetPixmap(), 0, 0, cx, cy, -1, -1 );
        }
        else
        {
            // No scaling and not a memory dc with a mask either

            // copy including child window contents
            gdk_gc_set_subwindow( m_penGC, GDK_INCLUDE_INFERIORS );
            gdk_window_copy_area( m_window, m_penGC, xx, yy,
                                  srcDC->GetWindow(),
                                  xsrc, ysrc, width, height );
            gdk_gc_set_subwindow( m_penGC, GDK_CLIP_BY_CHILDREN );
        }
    }

    SetLogicalFunction( old_logical_func );

    return true;
}

void wxWindowDCImpl::DoDrawText( const wxString &text, wxCoord x, wxCoord y )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    if (!m_window) return;

    if (text.empty()) return;

    GdkFont *font = m_font.GetInternalFont( m_scaleY );

    wxCHECK_RET( font, wxT("invalid font") );

    x = XLOG2DEV(x);
    y = YLOG2DEV(y);

    wxCoord width = gdk_string_width( font, text.mbc_str() );
    wxCoord height = font->ascent + font->descent;

    if ( m_backgroundMode == wxSOLID )
    {
        gdk_gc_set_foreground( m_textGC, m_textBackgroundColour.GetColor() );
        gdk_draw_rectangle( m_window, m_textGC, TRUE, x, y, width, height );
        gdk_gc_set_foreground( m_textGC, m_textForegroundColour.GetColor() );
    }
    gdk_draw_string( m_window, font, m_textGC, x, y + font->ascent, text.mbc_str() );

    /* CMB 17/7/98: simple underline: ignores scaling and underlying
       X font's XA_UNDERLINE_POSITION and XA_UNDERLINE_THICKNESS
       properties (see wxXt implementation) */
    if (m_font.GetUnderlined())
    {
        wxCoord ul_y = y + font->ascent;
        if (font->descent > 0) ul_y++;
        gdk_draw_line( m_window, m_textGC, x, ul_y, x + width, ul_y);
    }

    width = wxCoord(width / m_scaleX);
    height = wxCoord(height / m_scaleY);
    CalcBoundingBox (x + width, y + height);
    CalcBoundingBox (x, y);
}


// TODO: There is an example of rotating text with GTK2 that would probably be
// a better approach here:
//           http://www.daa.com.au/pipermail/pygtk/2003-April/005052.html

void wxWindowDCImpl::DoDrawRotatedText( const wxString &text, wxCoord x, wxCoord y, double angle )
{
    if ( wxIsNullDouble(angle) )
    {
        DoDrawText(text, x, y);
        return;
    }

    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    if (!m_window) return;

    wxCoord w;
    wxCoord h;

    GdkFont *font = m_font.GetInternalFont( m_scaleY );

    wxCHECK_RET( font, wxT("invalid font") );

    // the size of the text
    w = gdk_string_width( font, text.mbc_str() );
    h = font->ascent + font->descent;

    // draw the string normally
    wxBitmap src(w, h);
    wxMemoryDC dc;
    dc.SelectObject(src);
    dc.SetFont(GetFont());
    dc.SetBackground(*wxBLACK_BRUSH);
    dc.SetBrush(*wxBLACK_BRUSH);
    dc.Clear();
    dc.SetTextForeground( *wxWHITE );
    dc.DrawText(text, 0, 0);
    dc.SelectObject(wxNullBitmap);

    // Calculate the size of the rotated bounding box.
    double rad = DegToRad(angle);
    double dx = cos(rad),
           dy = sin(rad);

    // the rectngle vertices are counted clockwise with the first one being at
    // (0, 0) (or, rather, at (x, y))
    double x2 = w*dx,
           y2 = -w*dy;      // y axis points to the bottom, hence minus
    double x4 = h*dy,
           y4 = h*dx;
    double x3 = x4 + x2,
           y3 = y4 + y2;

    // calc max and min
    wxCoord maxX = (wxCoord)(dmax(x2, dmax(x3, x4)) + 0.5),
            maxY = (wxCoord)(dmax(y2, dmax(y3, y4)) + 0.5),
            minX = (wxCoord)(dmin(x2, dmin(x3, x4)) - 0.5),
            minY = (wxCoord)(dmin(y2, dmin(y3, y4)) - 0.5);


    wxImage image = src.ConvertToImage();

    image.ConvertColourToAlpha( m_textForegroundColour.Red(),
                                m_textForegroundColour.Green(),
                                m_textForegroundColour.Blue() );
    image = image.Rotate( rad, wxPoint(0,0) );

    int i_angle = (int) angle;
    i_angle = i_angle % 360;
    if (i_angle < 0)
        i_angle += 360;
    int xoffset = 0;
    if ((i_angle >= 90.0) && (i_angle < 270.0))
        xoffset = image.GetWidth();
    int yoffset = 0;
    if ((i_angle >= 0.0) && (i_angle < 180.0))
        yoffset = image.GetHeight();

    if ((i_angle >= 0) && (i_angle < 90))
        yoffset -= (int)( cos(rad)*h );
    if ((i_angle >= 90) && (i_angle < 180))
        xoffset -= (int)( sin(rad)*h );
    if ((i_angle >= 180) && (i_angle < 270))
        yoffset -= (int)( cos(rad)*h );
    if ((i_angle >= 270) && (i_angle < 360))
        xoffset -= (int)( sin(rad)*h );

    int i_x = x - xoffset;
    int i_y = y - yoffset;

    src = image;
    DoDrawBitmap( src, i_x, i_y, true );


    // it would be better to draw with non underlined font and draw the line
    // manually here (it would be more straight...)
#if 0
    if ( m_font.GetUnderlined() )
    {
        gdk_draw_line( m_window, m_textGC,
                       XLOG2DEV(x + x4), YLOG2DEV(y + y4 + font->descent),
                       XLOG2DEV(x + x3), YLOG2DEV(y + y3 + font->descent));
    }
#endif // 0

    // update the bounding box
    CalcBoundingBox(x + minX, y + minY);
    CalcBoundingBox(x + maxX, y + maxY);
}

void wxWindowDCImpl::DoGetTextExtent(const wxString &string,
                                 wxCoord *width, wxCoord *height,
                                 wxCoord *descent, wxCoord *externalLeading,
                                 const wxFont *theFont) const
{
    if ( width )
        *width = 0;
    if ( height )
        *height = 0;
    if ( descent )
        *descent = 0;
    if ( externalLeading )
        *externalLeading = 0;

    if (string.empty())
    {
        return;
    }

    wxFont fontToUse = m_font;
    if (theFont)
        fontToUse = *theFont;

    GdkFont *font = fontToUse.GetInternalFont( m_scaleY );
    if ( !font )
        return;

    if (width)
        *width = wxCoord(gdk_string_width( font, string.mbc_str() ) / m_scaleX);
    if (height)
        *height = wxCoord((font->ascent + font->descent) / m_scaleY);
    if (descent)
        *descent = wxCoord(font->descent / m_scaleY);
}

wxCoord wxWindowDCImpl::GetCharWidth() const
{
    GdkFont *font = m_font.GetInternalFont( m_scaleY );
    wxCHECK_MSG( font, -1, wxT("invalid font") );

    return wxCoord(gdk_string_width( font, "H" ) / m_scaleX);
}

wxCoord wxWindowDCImpl::GetCharHeight() const
{
    GdkFont *font = m_font.GetInternalFont( m_scaleY );
    wxCHECK_MSG( font, -1, wxT("invalid font") );

    return wxCoord((font->ascent + font->descent) / m_scaleY);
}

void wxWindowDCImpl::Clear()
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    if (!m_window) return;

    // VZ: the code below results in infinite recursion and crashes when
    //     dc.Clear() is done from OnPaint() so I disable it for now.
    //     I don't know what the correct fix is but Clear() surely should not
    //     reenter OnPaint()!
#if 0
    /* - we either are a memory dc or have a window as the
       owner. anything else shouldn't happen.
       - we don't use gdk_window_clear() as we don't set
       the window's background colour anymore. it is too
       much pain to keep the DC's and the window's back-
       ground colour in synch. */

    if (m_owner)
    {
        m_owner->Clear();
        return;
    }

    if (m_isMemDC)
    {
        int width,height;
        GetSize( &width, &height );
        gdk_draw_rectangle( m_window, m_bgGC, TRUE, 0, 0, width, height );
        return;
    }
#else // 1
    int width,height;
    GetSize( &width, &height );
    gdk_draw_rectangle( m_window, m_bgGC, TRUE, 0, 0, width, height );
#endif // 0/1
}

void wxWindowDCImpl::SetFont( const wxFont &font )
{
    m_font = font;
}

void wxWindowDCImpl::SetPen( const wxPen &pen )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    if (m_pen == pen) return;

    m_pen = pen;

    if (!m_pen.IsOk()) return;

    if (!m_window) return;

    gint width = m_pen.GetWidth();
    if (width <= 0)
    {
        // CMB: if width is non-zero scale it with the dc
        width = 1;
    }
    else
    {
        // X doesn't allow different width in x and y and so we take
        // the average
        double w = 0.5 +
                   ( fabs((double) XLOG2DEVREL(width)) +
                     fabs((double) YLOG2DEVREL(width)) ) / 2.0;
        width = (int)w;
        if ( !width )
        {
            // width can't be 0 or an internal GTK error occurs inside
            // gdk_gc_set_dashes() below
            width = 1;
        }
    }

    static const wxGTKDash dotted[] = {1, 1};
    static const wxGTKDash short_dashed[] = {2, 2};
    static const wxGTKDash wxCoord_dashed[] = {2, 4};
    static const wxGTKDash dotted_dashed[] = {3, 3, 1, 3};

    // We express dash pattern in pen width unit, so we are
    // independent of zoom factor and so on...
    int req_nb_dash;
    const wxGTKDash *req_dash;

    GdkLineStyle lineStyle = GDK_LINE_SOLID;
    switch (m_pen.GetStyle())
    {
        case wxUSER_DASH:
        {
            lineStyle = GDK_LINE_ON_OFF_DASH;
            req_nb_dash = m_pen.GetDashCount();
            req_dash = (wxGTKDash*)m_pen.GetDash();
            break;
        }
        case wxDOT:
        {
            lineStyle = GDK_LINE_ON_OFF_DASH;
            req_nb_dash = 2;
            req_dash = dotted;
            break;
        }
        case wxLONG_DASH:
        {
            lineStyle = GDK_LINE_ON_OFF_DASH;
            req_nb_dash = 2;
            req_dash = wxCoord_dashed;
            break;
        }
        case wxSHORT_DASH:
        {
            lineStyle = GDK_LINE_ON_OFF_DASH;
            req_nb_dash = 2;
            req_dash = short_dashed;
            break;
        }
        case wxDOT_DASH:
        {
//            lineStyle = GDK_LINE_DOUBLE_DASH;
            lineStyle = GDK_LINE_ON_OFF_DASH;
            req_nb_dash = 4;
            req_dash = dotted_dashed;
            break;
        }

        case wxTRANSPARENT:
        case wxSTIPPLE_MASK_OPAQUE:
        case wxSTIPPLE:
        case wxSOLID:
        default:
        {
            lineStyle = GDK_LINE_SOLID;
            req_dash = NULL;
            req_nb_dash = 0;
            break;
        }
    }

    if (req_dash && req_nb_dash)
    {
        wxGTKDash *real_req_dash = new wxGTKDash[req_nb_dash];
        if (real_req_dash)
        {
            for (int i = 0; i < req_nb_dash; i++)
                real_req_dash[i] = req_dash[i] * width;
            gdk_gc_set_dashes( m_penGC, 0, real_req_dash, req_nb_dash );
            delete[] real_req_dash;
        }
        else
        {
            // No Memory. We use non-scaled dash pattern...
            gdk_gc_set_dashes( m_penGC, 0, (wxGTKDash*)req_dash, req_nb_dash );
        }
    }

    GdkCapStyle capStyle = GDK_CAP_ROUND;
    switch (m_pen.GetCap())
    {
        case wxCAP_PROJECTING: { capStyle = GDK_CAP_PROJECTING; break; }
        case wxCAP_BUTT:       { capStyle = GDK_CAP_BUTT;       break; }
        case wxCAP_ROUND:
        default:
        {
            if (width <= 1)
            {
                width = 0;
                capStyle = GDK_CAP_NOT_LAST;
            }
            else
            {
                capStyle = GDK_CAP_ROUND;
            }
            break;
        }
    }

    GdkJoinStyle joinStyle = GDK_JOIN_ROUND;
    switch (m_pen.GetJoin())
    {
        case wxJOIN_BEVEL: { joinStyle = GDK_JOIN_BEVEL; break; }
        case wxJOIN_MITER: { joinStyle = GDK_JOIN_MITER; break; }
        case wxJOIN_ROUND:
        default:           { joinStyle = GDK_JOIN_ROUND; break; }
    }

    gdk_gc_set_line_attributes( m_penGC, width, lineStyle, capStyle, joinStyle );

    m_pen.GetColour().CalcPixel( m_cmap );
    gdk_gc_set_foreground( m_penGC, m_pen.GetColour().GetColor() );
}

void wxWindowDCImpl::SetBrush( const wxBrush &brush )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    if (m_brush == brush) return;

    m_brush = brush;

    if (!m_brush.IsOk()) return;

    if (!m_window) return;

    m_brush.GetColour().CalcPixel( m_cmap );
    gdk_gc_set_foreground( m_brushGC, m_brush.GetColour().GetColor() );

    gdk_gc_set_fill( m_brushGC, GDK_SOLID );

    if ((m_brush.GetStyle() == wxSTIPPLE) && (m_brush.GetStipple()->IsOk()))
    {
        if (m_brush.GetStipple()->GetPixmap())
        {
            gdk_gc_set_fill( m_brushGC, GDK_TILED );
            gdk_gc_set_tile( m_brushGC, m_brush.GetStipple()->GetPixmap() );
        }
        else
        {
            gdk_gc_set_fill( m_brushGC, GDK_STIPPLED );
            gdk_gc_set_stipple( m_brushGC, m_brush.GetStipple()->GetBitmap() );
        }
    }

    if ((m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE) && (m_brush.GetStipple()->GetMask()))
    {
        gdk_gc_set_fill( m_textGC, GDK_OPAQUE_STIPPLED);
        gdk_gc_set_stipple( m_textGC, m_brush.GetStipple()->GetMask()->GetBitmap() );
    }

    if (m_brush.IsHatch())
    {
        gdk_gc_set_fill( m_brushGC, GDK_STIPPLED );
        int num = m_brush.GetStyle() - wxBDIAGONAL_HATCH;
        gdk_gc_set_stipple( m_brushGC, hatches[num] );
    }
}

void wxWindowDCImpl::SetBackground( const wxBrush &brush )
{
   /* CMB 21/7/98: Added SetBackground. Sets background brush
    * for Clear() and bg colour for shapes filled with cross-hatch brush */

    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    if (m_backgroundBrush == brush) return;

    m_backgroundBrush = brush;

    if (!m_backgroundBrush.IsOk()) return;

    if (!m_window) return;

    m_backgroundBrush.GetColour().CalcPixel( m_cmap );
    gdk_gc_set_background( m_brushGC, m_backgroundBrush.GetColour().GetColor() );
    gdk_gc_set_background( m_penGC, m_backgroundBrush.GetColour().GetColor() );
    gdk_gc_set_background( m_bgGC, m_backgroundBrush.GetColour().GetColor() );
    gdk_gc_set_foreground( m_bgGC, m_backgroundBrush.GetColour().GetColor() );

    gdk_gc_set_fill( m_bgGC, GDK_SOLID );

    if ((m_backgroundBrush.GetStyle() == wxSTIPPLE) && (m_backgroundBrush.GetStipple()->IsOk()))
    {
        if (m_backgroundBrush.GetStipple()->GetPixmap())
        {
            gdk_gc_set_fill( m_bgGC, GDK_TILED );
            gdk_gc_set_tile( m_bgGC, m_backgroundBrush.GetStipple()->GetPixmap() );
        }
        else
        {
            gdk_gc_set_fill( m_bgGC, GDK_STIPPLED );
            gdk_gc_set_stipple( m_bgGC, m_backgroundBrush.GetStipple()->GetBitmap() );
        }
    }

    if (m_backgroundBrush.IsHatch())
    {
        gdk_gc_set_fill( m_bgGC, GDK_STIPPLED );
        int num = m_backgroundBrush.GetStyle() - wxBDIAGONAL_HATCH;
        gdk_gc_set_stipple( m_bgGC, hatches[num] );
    }
}

void wxWindowDCImpl::SetLogicalFunction( wxRasterOperationMode function )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    if (m_logicalFunction == function)
        return;

    // VZ: shouldn't this be a CHECK?
    if (!m_window)
        return;

    GdkFunction mode;
    switch (function)
    {
        case wxXOR:          mode = GDK_XOR;           break;
        case wxINVERT:       mode = GDK_INVERT;        break;
        case wxOR_REVERSE:   mode = GDK_OR_REVERSE;    break;
        case wxAND_REVERSE:  mode = GDK_AND_REVERSE;   break;
        case wxCLEAR:        mode = GDK_CLEAR;         break;
        case wxSET:          mode = GDK_SET;           break;
        case wxOR_INVERT:    mode = GDK_OR_INVERT;     break;
        case wxAND:          mode = GDK_AND;           break;
        case wxOR:           mode = GDK_OR;            break;
        case wxEQUIV:        mode = GDK_EQUIV;         break;
        case wxNAND:         mode = GDK_NAND;          break;
        case wxAND_INVERT:   mode = GDK_AND_INVERT;    break;
        case wxCOPY:         mode = GDK_COPY;          break;
        case wxNO_OP:        mode = GDK_NOOP;          break;
        case wxSRC_INVERT:   mode = GDK_COPY_INVERT;   break;

        // unsupported by GTK
        case wxNOR:          mode = GDK_COPY;          break;
        default:
           wxFAIL_MSG( wxT("unsupported logical function") );
           mode = GDK_COPY;
    }

    m_logicalFunction = function;

    gdk_gc_set_function( m_penGC, mode );
    gdk_gc_set_function( m_brushGC, mode );

    // to stay compatible with wxMSW, we don't apply ROPs to the text
    // operations (i.e. DrawText/DrawRotatedText).
    // True, but mono-bitmaps use the m_textGC and they use ROPs as well.
    gdk_gc_set_function( m_textGC, mode );
}

void wxWindowDCImpl::SetTextForeground( const wxColour &col )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    // don't set m_textForegroundColour to an invalid colour as we'd crash
    // later then (we use m_textForegroundColour.GetColor() without checking
    // in a few places)
    if ( !col.IsOk() || (m_textForegroundColour == col) )
        return;

    m_textForegroundColour = col;

    if ( m_window )
    {
        m_textForegroundColour.CalcPixel( m_cmap );
        gdk_gc_set_foreground( m_textGC, m_textForegroundColour.GetColor() );
    }
}

void wxWindowDCImpl::SetTextBackground( const wxColour &col )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    // same as above
    if ( !col.IsOk() || (m_textBackgroundColour == col) )
        return;

    m_textBackgroundColour = col;

    if ( m_window )
    {
        m_textBackgroundColour.CalcPixel( m_cmap );
        gdk_gc_set_background( m_textGC, m_textBackgroundColour.GetColor() );
    }
}

void wxWindowDCImpl::SetBackgroundMode( int mode )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    m_backgroundMode = mode;

    if (!m_window) return;

    // CMB 21/7/98: fill style of cross-hatch brushes is affected by
    // transparent/solid background mode

    if (m_brush.GetStyle() != wxSOLID && m_brush.GetStyle() != wxTRANSPARENT)
    {
        gdk_gc_set_fill( m_brushGC,
          (m_backgroundMode == wxTRANSPARENT) ? GDK_STIPPLED : GDK_OPAQUE_STIPPLED);
    }
}

void wxWindowDCImpl::SetPalette( const wxPalette& WXUNUSED(palette) )
{
    wxFAIL_MSG( wxT("wxWindowDCImpl::SetPalette not implemented") );
}

void wxWindowDCImpl::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    if (!m_window) return;

    wxRect rect;
    rect.x = XLOG2DEV(x);
    rect.y = YLOG2DEV(y);
    rect.width = XLOG2DEVREL(width);
    rect.height = YLOG2DEVREL(height);

    if (!m_currentClippingRegion.IsNull())
        m_currentClippingRegion.Intersect( rect );
    else
        m_currentClippingRegion.Union( rect );

#if USE_PAINT_REGION
    if (!m_paintClippingRegion.IsNull())
        m_currentClippingRegion.Intersect( m_paintClippingRegion );
#endif

    wxCoord xx, yy, ww, hh;
    m_currentClippingRegion.GetBox( xx, yy, ww, hh );
    wxGTKDCImpl::DoSetClippingRegion( xx, yy, ww, hh );

    gdk_gc_set_clip_region( m_penGC, m_currentClippingRegion.GetRegion() );
    gdk_gc_set_clip_region( m_brushGC, m_currentClippingRegion.GetRegion() );
    gdk_gc_set_clip_region( m_textGC, m_currentClippingRegion.GetRegion() );
    gdk_gc_set_clip_region( m_bgGC, m_currentClippingRegion.GetRegion() );
}

void wxWindowDCImpl::DoSetDeviceClippingRegion( const wxRegion &region  )
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    if (region.Empty())
    {
        DestroyClippingRegion();
        return;
    }

    if (!m_window) return;

    if (!m_currentClippingRegion.IsNull())
        m_currentClippingRegion.Intersect( region );
    else
        m_currentClippingRegion.Union( region );

#if USE_PAINT_REGION
    if (!m_paintClippingRegion.IsNull())
        m_currentClippingRegion.Intersect( m_paintClippingRegion );
#endif

    wxCoord xx, yy, ww, hh;
    m_currentClippingRegion.GetBox( xx, yy, ww, hh );
    wxGTKDCImpl::DoSetClippingRegion( xx, yy, ww, hh );

    gdk_gc_set_clip_region( m_penGC, m_currentClippingRegion.GetRegion() );
    gdk_gc_set_clip_region( m_brushGC, m_currentClippingRegion.GetRegion() );
    gdk_gc_set_clip_region( m_textGC, m_currentClippingRegion.GetRegion() );
    gdk_gc_set_clip_region( m_bgGC, m_currentClippingRegion.GetRegion() );
}

void wxWindowDCImpl::DestroyClippingRegion()
{
    wxCHECK_RET( IsOk(), wxT("invalid window dc") );

    wxGTKDCImpl::DestroyClippingRegion();

    m_currentClippingRegion.Clear();

#if USE_PAINT_REGION
    if (!m_paintClippingRegion.IsEmpty())
        m_currentClippingRegion.Union( m_paintClippingRegion );
#endif

    if (!m_window) return;

    if (m_currentClippingRegion.IsEmpty())
    {
        gdk_gc_set_clip_rectangle( m_penGC, NULL );
        gdk_gc_set_clip_rectangle( m_brushGC, NULL );
        gdk_gc_set_clip_rectangle( m_textGC, NULL );
        gdk_gc_set_clip_rectangle( m_bgGC, NULL );
    }
    else
    {
        gdk_gc_set_clip_region( m_penGC, m_currentClippingRegion.GetRegion() );
        gdk_gc_set_clip_region( m_brushGC, m_currentClippingRegion.GetRegion() );
        gdk_gc_set_clip_region( m_textGC, m_currentClippingRegion.GetRegion() );
        gdk_gc_set_clip_region( m_bgGC, m_currentClippingRegion.GetRegion() );
    }
}

void wxWindowDCImpl::Destroy()
{
    if (m_penGC) wxFreePoolGC( m_penGC );
    m_penGC = NULL;
    if (m_brushGC) wxFreePoolGC( m_brushGC );
    m_brushGC = NULL;
    if (m_textGC) wxFreePoolGC( m_textGC );
    m_textGC = NULL;
    if (m_bgGC) wxFreePoolGC( m_bgGC );
    m_bgGC = NULL;
}

void wxWindowDCImpl::ComputeScaleAndOrigin()
{
    const wxRealPoint origScale(m_scaleX, m_scaleY);

    wxGTKDCImpl::ComputeScaleAndOrigin();

    // if scale has changed call SetPen to recalulate the line width
    if ( wxRealPoint(m_scaleX, m_scaleY) != origScale && m_pen.IsOk() )
    {
        // this is a bit artificial, but we need to force wxDC to think the pen
        // has changed
        wxPen pen = m_pen;
        m_pen = wxNullPen;
        SetPen( pen );
    }
}

// Resolution in pixels per logical inch
wxSize wxWindowDCImpl::GetPPI() const
{
    return wxSize( (int) (m_mm_to_pix_x * 25.4 + 0.5), (int) (m_mm_to_pix_y * 25.4 + 0.5));
}

int wxWindowDCImpl::GetDepth() const
{
    wxFAIL_MSG(wxT("not implemented"));

    return -1;
}


//-----------------------------------------------------------------------------
// wxPaintDCImpl
//-----------------------------------------------------------------------------

IMPLEMENT_ABSTRACT_CLASS(wxPaintDCImpl, wxClientDCImpl)

// Limit the paint region to the window size. Sometimes
// the paint region is too big, and this risks X11 errors
static void wxLimitRegionToSize(wxRegion& region, const wxSize& sz)
{
    wxRect originalRect = region.GetBox();
    wxRect rect(originalRect);
    if (rect.width + rect.x > sz.x)
        rect.width = sz.x - rect.x;
    if (rect.height + rect.y > sz.y)
        rect.height = sz.y - rect.y;
    if (rect != originalRect)
    {
        region = wxRegion(rect);
        wxLogTrace(wxT("painting"), wxT("Limiting region from %d, %d, %d, %d to %d, %d, %d, %d\n"),
                   originalRect.x, originalRect.y, originalRect.width, originalRect.height,
                   rect.x, rect.y, rect.width, rect.height);
    }
}

wxPaintDCImpl::wxPaintDCImpl(wxDC *owner, wxWindow *win)
             : wxClientDCImpl(owner, win)
{
#if USE_PAINT_REGION
    if (!win->m_clipPaintRegion)
        return;

    wxSize sz = win->GetSize();
    m_paintClippingRegion = win->GetUpdateRegion();
    wxLimitRegionToSize(m_paintClippingRegion, sz);

    GdkRegion *region = m_paintClippingRegion.GetRegion();
    if ( region )
    {
        m_currentClippingRegion.Union( m_paintClippingRegion );
        wxLimitRegionToSize(m_currentClippingRegion, sz);

        if (sz.x <= 0 || sz.y <= 0)
            return ;

        gdk_gc_set_clip_region( m_penGC, region );
        gdk_gc_set_clip_region( m_brushGC, region );
        gdk_gc_set_clip_region( m_textGC, region );
        gdk_gc_set_clip_region( m_bgGC, region );
    }
#endif // USE_PAINT_REGION
}

//-----------------------------------------------------------------------------
// wxClientDCImpl
//-----------------------------------------------------------------------------

IMPLEMENT_ABSTRACT_CLASS(wxClientDCImpl, wxWindowDCImpl)

wxClientDCImpl::wxClientDCImpl(wxDC *owner, wxWindow *win)
              : wxWindowDCImpl(owner, win)
{
    wxCHECK_RET( win, wxT("NULL window in wxClientDCImpl::wxClientDCImpl") );

#ifdef __WXUNIVERSAL__
    wxPoint ptOrigin = win->GetClientAreaOrigin();
    SetDeviceOrigin(ptOrigin.x, ptOrigin.y);
    wxSize size = win->GetClientSize();
    SetClippingRegion(wxPoint(0, 0), size);
#endif // __WXUNIVERSAL__
}

void wxClientDCImpl::DoGetSize(int *width, int *height) const
{
    wxCHECK_RET( m_owner, wxT("GetSize() doesn't work without window") );

    m_owner->GetClientSize( width, height );
}

// ----------------------------------------------------------------------------
// wxDCModule
// ----------------------------------------------------------------------------

class wxDCModule : public wxModule
{
public:
    bool OnInit();
    void OnExit();

private:
    DECLARE_DYNAMIC_CLASS(wxDCModule)
};

IMPLEMENT_DYNAMIC_CLASS(wxDCModule, wxModule)

bool wxDCModule::OnInit()
{
    wxInitGCPool();
    return true;
}

void wxDCModule::OnExit()
{
    wxCleanUpGCPool();
}