don't crash under GTK1 if we failed to get GdkFont in GetTextExtent()

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

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

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma implementation "dcclient.h"
#endif

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

#ifdef __VMS
#define XCopyPlane XCOPYPLANE
#endif

#include "wx/dcclient.h"
#include "wx/dcmemory.h"
#include "wx/image.h"
#include "wx/module.h"
#include "wx/log.h"
#include "wx/fontutil.h"

#include "wx/gtk/win_gtk.h"

#include <math.h>               // for floating-point functions

#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)
{
    g_return_if_fail (drawable != NULL);
    g_return_if_fail (src != NULL);
    g_return_if_fail (gc != NULL);
    
#ifdef __WXGTK20__
    gint src_width, src_height;
    gdk_drawable_get_size(src, &src_width, &src_height);
    if (width == -1) width = src_width;
    if (height == -1) height = src_height;

    XCopyPlane( GDK_WINDOW_XDISPLAY(drawable),
                GDK_WINDOW_XID(src),
                GDK_WINDOW_XID(drawable),
                GDK_GC_XGC(gc),
                xsrc, ysrc,
                width, height,
                0, 0,
                1 );
#else
    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 );
#endif
}

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

#define GC_POOL_SIZE 200

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 (GdkGC*) 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") );
}

//-----------------------------------------------------------------------------
// wxWindowDC
//-----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxWindowDC, wxDC)

wxWindowDC::wxWindowDC()
{
    m_penGC = (GdkGC *) NULL;
    m_brushGC = (GdkGC *) NULL;
    m_textGC = (GdkGC *) NULL;
    m_bgGC = (GdkGC *) NULL;
    m_cmap = (GdkColormap *) NULL;
    m_isMemDC = FALSE;
    m_isScreenDC = FALSE;
    m_owner = (wxWindow *)NULL;
#ifdef __WXGTK20__
    m_context = (PangoContext *)NULL;
    m_layout = (PangoLayout *)NULL;
    m_fontdesc = (PangoFontDescription *)NULL;
#endif
}

wxWindowDC::wxWindowDC( wxWindow *window )
{
    wxASSERT_MSG( window, wxT("DC needs a window") );

    m_penGC = (GdkGC *) NULL;
    m_brushGC = (GdkGC *) NULL;
    m_textGC = (GdkGC *) NULL;
    m_bgGC = (GdkGC *) NULL;
    m_cmap = (GdkColormap *) NULL;
    m_owner = (wxWindow *)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") );

#ifdef __WXGTK20__
    m_context = window->GtkGetPangoDefaultContext();
    m_layout = pango_layout_new( m_context );
    m_fontdesc = pango_font_description_copy( widget->style->font_desc );
#endif

    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;
}

wxWindowDC::~wxWindowDC()
{
    Destroy();
    
#ifdef __WXGTK20__
    if (m_layout)
        g_object_unref( G_OBJECT( m_layout ) );
    if (m_fontdesc)
        pango_font_description_free( m_fontdesc );
#endif
}

void wxWindowDC::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 && (((wxMemoryDC*)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, (GdkRectangle *) NULL );
    gdk_gc_set_clip_rectangle( m_brushGC, (GdkRectangle *) NULL );
    gdk_gc_set_clip_rectangle( m_textGC, (GdkRectangle *) NULL );
    gdk_gc_set_clip_rectangle( m_bgGC, (GdkRectangle *) NULL );

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

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

    m_owner->GetSize(width, height);
}

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

bool wxWindowDC::DoFloodFill(wxCoord x, wxCoord y,
                             const wxColour& col, int style)
{
    return wxDoFloodFill(this, x, y, col, style);
}

bool wxWindowDC::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, (wxDC*) this, 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 wxWindowDC::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
{
    wxCHECK_RET( Ok(), 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 wxWindowDC::DoCrossHair( wxCoord x, wxCoord y )
{
    wxCHECK_RET( Ok(), 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 wxWindowDC::DoDrawArc( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2,
                            wxCoord xc, wxCoord yc )
{
    wxCHECK_RET( Ok(), 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 (radius == 0.0)
    {
        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 wxWindowDC::DoDrawEllipticArc( wxCoord x, wxCoord y, wxCoord width, wxCoord height, double sa, double ea )
{
    wxCHECK_RET( Ok(), 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 wxWindowDC::DoDrawPoint( wxCoord x, wxCoord y )
{
    wxCHECK_RET( Ok(), 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 wxWindowDC::DoDrawLines( int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset )
{
    wxCHECK_RET( Ok(), wxT("invalid window dc") );

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

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

    for (int i = 0; i < n; i++) 
    {
        wxCoord x1 = XLOG2DEV(points[i].x + xoffset);
        wxCoord y1 = YLOG2DEV(points[i].y + yoffset);

        CalcBoundingBox( x1 + xoffset, y1 + yoffset );

        gpts[i].x = x1;
        gpts[i].y = y1;
    }

    if (m_window)
        gdk_draw_lines( m_window, m_penGC, gpts, n);

    delete[] gpts;
}

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

    if (n <= 0) return;

    GdkPoint *gdkpoints = new GdkPoint[n+1];
    int i;
    for (i = 0 ; i < n ; i++)
    {
        gdkpoints[i].x = XLOG2DEV(points[i].x + xoffset);
        gdkpoints[i].y = YLOG2DEV(points[i].y + yoffset);

        CalcBoundingBox( points[i].x + xoffset, points[i].y + yoffset );
    }

    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_polygon( m_window, m_textGC, TRUE, gdkpoints, 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, gdkpoints, 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, gdkpoints, 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, gdkpoints, n );
                gdk_gc_set_ts_origin( m_brushGC, 0, 0 );
            }
            else
            {
                gdk_draw_polygon( m_window, m_brushGC, TRUE, gdkpoints, n );
            }
        }

        if (m_pen.GetStyle() != wxTRANSPARENT)
        {
/*
            for (i = 0 ; i < n ; i++)
            {
                gdk_draw_line( m_window, m_penGC,
                               gdkpoints[i%n].x,
                               gdkpoints[i%n].y,
                               gdkpoints[(i+1)%n].x,
                               gdkpoints[(i+1)%n].y);
            }
*/
            gdk_draw_polygon( m_window, m_penGC, FALSE, gdkpoints, n );
            
        }
    }

    delete[] gdkpoints;
}

void wxWindowDC::DoDrawRectangle( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
{
    wxCHECK_RET( Ok(), 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 wxWindowDC::DoDrawRoundedRectangle( wxCoord x, wxCoord y, wxCoord width, wxCoord height, double radius )
{
    wxCHECK_RET( Ok(), 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)
    {
        DrawRectangle( 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 wxWindowDC::DoDrawEllipse( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
{
    wxCHECK_RET( Ok(), 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 wxWindowDC::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, (bool)TRUE );
}

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

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

    GdkBitmap *new_mask = (GdkBitmap*) 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)
    {
#ifdef __WXGTK20__
        GdkPixmap *bitmap = gdk_pixmap_new( wxGetRootWindow()->window, ww, hh, -1 );
        GdkGC *gc = gdk_gc_new( bitmap );
        gdk_gc_set_foreground( gc, m_textForegroundColour.GetColor() );
        gdk_gc_set_background( gc, m_textBackgroundColour.GetColor() );
        gdk_wx_draw_bitmap( bitmap, gc, use_bitmap.GetBitmap(), 0, 0, 0, 0, -1, -1 );
                
        gdk_draw_drawable( m_window, m_textGC, bitmap, 0, 0, xx, yy, -1, -1 );
        
        gdk_bitmap_unref( bitmap );
        gdk_gc_unref( gc );
#else
        gdk_wx_draw_bitmap( m_window, m_textGC, use_bitmap.GetBitmap(), 0, 0, xx, yy, -1, -1 );
#endif
    }
    else
    {
#if GTK_CHECK_VERSION(2,2,0)
        if (use_bitmap.HasPixbuf())
        {
            gdk_draw_pixbuf(m_window, m_penGC,
                            use_bitmap.GetPixbuf(),
                            0, 0, xx, yy, -1, -1,
                            GDK_RGB_DITHER_NORMAL, xx, yy);
        }
        else
#endif
        {
            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, (GdkBitmap *) 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, (GdkBitmap *) 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 wxWindowDC::DoBlit( wxCoord xdest, wxCoord ydest,
                         wxCoord width, wxCoord height,
                         wxDC *source,
                         wxCoord xsrc, wxCoord ysrc,
                         int logical_func,
                         bool useMask,
                         wxCoord xsrcMask, wxCoord ysrcMask )
{
    wxCHECK_MSG( Ok(), 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->XLOG2DEV(xsrc);
    ysrc = source->YLOG2DEV(ysrc);

    wxClientDC *srcDC = (wxClientDC*)source;
    wxMemoryDC *memDC = (wxMemoryDC*)source;

    bool use_bitmap_method = FALSE;
    bool is_mono = FALSE;

    // TODO: use the mask origin when drawing transparently
    if (xsrcMask == -1 && ysrcMask == -1)
    {
        xsrcMask = xsrc;
        ysrcMask = ysrc;
    }

    if (srcDC->m_isMemDC)
    {
        if (!memDC->m_selected.Ok()) 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;
    }

    int 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 ((bm_width != bm_ww) || (bm_height != 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 = (GdkBitmap *) NULL;
        if (use_bitmap.GetMask()) mask = use_bitmap.GetMask()->GetBitmap();

        GdkBitmap *new_mask = (GdkBitmap*) 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_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 );
                else
                    gdk_gc_set_clip_mask( m_textGC, mask );
                // was: gdk_gc_set_clip_origin( m_textGC, xx, yy );
                gdk_gc_set_clip_origin( m_textGC, cx, cy );
            }
            else
            {
                if (new_mask)
                    gdk_gc_set_clip_mask( m_penGC, new_mask );
                else
                    gdk_gc_set_clip_mask( m_penGC, mask );
                // was: gdk_gc_set_clip_origin( m_penGC, xx, yy );
                gdk_gc_set_clip_origin( m_penGC, cx, cy );
            }
        }

        // 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)
        {
#ifdef __WXGTK20__
            GdkPixmap *bitmap = gdk_pixmap_new( wxGetRootWindow()->window, bm_ww, bm_hh, -1 );
            GdkGC *gc = gdk_gc_new( bitmap );
            gdk_gc_set_foreground( gc, m_textForegroundColour.GetColor() );
            gdk_gc_set_background( gc, m_textBackgroundColour.GetColor() );
            gdk_wx_draw_bitmap( bitmap, gc, use_bitmap.GetBitmap(), 0, 0, 0, 0, -1, -1 );
                
            gdk_draw_drawable( m_window, m_textGC, bitmap, xsrc, ysrc, cx, cy, cw, ch );
        
            gdk_bitmap_unref( bitmap );
            gdk_gc_unref( gc );
#else
            // 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 );
#endif
        }
        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, (GdkBitmap *) 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, (GdkBitmap *) 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 wxWindowDC::DoDrawText( const wxString &text, wxCoord x, wxCoord y )
{
    wxCHECK_RET( Ok(), wxT("invalid window dc") );

    if (!m_window) return;
    
    if (text.empty()) return;

#ifndef __WXGTK20__
    GdkFont *font = m_font.GetInternalFont( m_scaleY );

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

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

#ifdef __WXGTK20__
    wxCHECK_RET( m_context, wxT("no Pango context") );
    wxCHECK_RET( m_layout, wxT("no Pango layout") );
    wxCHECK_RET( m_fontdesc, wxT("no Pango font description") );

    bool underlined = m_font.Ok() && m_font.GetUnderlined();

#if wxUSE_UNICODE
    const wxCharBuffer data = wxConvUTF8.cWC2MB( text );
#else
    const wxWCharBuffer wdata = wxConvLocal.cMB2WC( text );
    if ( !wdata )
        return;
    const wxCharBuffer data = wxConvUTF8.cWC2MB( wdata );
#endif
    size_t datalen = strlen((const char*)data);
    pango_layout_set_text( m_layout, (const char*) data, datalen);
    
    if (underlined)
    {
        PangoAttrList *attrs = pango_attr_list_new();
        PangoAttribute *a = pango_attr_underline_new(PANGO_UNDERLINE_SINGLE);
        a->start_index = 0;
        a->end_index = datalen;
        pango_attr_list_insert(attrs, a);
        pango_layout_set_attributes(m_layout, attrs);
        pango_attr_list_unref(attrs);
    }

    int w,h;
    
    if (fabs(m_scaleY - 1.0) < 0.00001)
    {
         // If there is a user or actually any scale applied to
         // the device context, scale the font.
         
         // scale font description
         gint oldSize = pango_font_description_get_size( m_fontdesc );
         double size = oldSize;
         size = size * m_scaleY;
         pango_font_description_set_size( m_fontdesc, (gint)size );
         
         // actually apply scaled font
         pango_layout_set_font_description( m_layout, m_fontdesc );
        
         pango_layout_get_pixel_size( m_layout, &w, &h );
         if ( m_backgroundMode == wxSOLID )
         {
            gdk_gc_set_foreground(m_textGC, m_textBackgroundColour.GetColor());
            gdk_draw_rectangle(m_window, m_textGC, TRUE, x, y, w, h);
            gdk_gc_set_foreground(m_textGC, m_textForegroundColour.GetColor());
         }
         
         // Draw layout.
         gdk_draw_layout( m_window, m_textGC, x, y, m_layout );
         
         // reset unscaled size
         pango_font_description_set_size( m_fontdesc, oldSize );
         
         // actually apply unscaled font
         pango_layout_set_font_description( m_layout, m_fontdesc );
    }
    else
    {
        pango_layout_get_pixel_size( m_layout, &w, &h );
        if ( m_backgroundMode == wxSOLID )
        {
            gdk_gc_set_foreground(m_textGC, m_textBackgroundColour.GetColor());
            gdk_draw_rectangle(m_window, m_textGC, TRUE, x, y, w, h);
            gdk_gc_set_foreground(m_textGC, m_textForegroundColour.GetColor());
        }
        // Draw layout.
        gdk_draw_layout( m_window, m_textGC, x, y, m_layout );
    }

    if (underlined)
    {
        // undo underline attributes setting:
        pango_layout_set_attributes(m_layout, NULL);
    }
    
    wxCoord width = w;
    wxCoord height = h;
    
#else // GTK+ 1.x
    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);
    }
#endif // GTK+ 2.0/1.x

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

void wxWindowDC::DoDrawRotatedText( const wxString &text, wxCoord x, wxCoord y, double angle )
{
    if (angle == 0.0)
    {
        DrawText(text, x, y);
        return;
    }

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

    if (!m_window) return;

#ifdef __WXGTK20__
    // implement later without GdkFont for GTK 2.0
    return;
#else
    GdkFont *font = m_font.GetInternalFont( m_scaleY );

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

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

    // draw the string normally
    wxBitmap src(w, h);
    wxMemoryDC dc;
    dc.SelectObject(src);
    dc.SetFont(GetFont());
    dc.SetBackground(*wxWHITE_BRUSH);
    dc.SetBrush(*wxBLACK_BRUSH);
    dc.Clear();
    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);

    // prepare to blit-with-rotate the bitmap to the DC
    wxImage image = src.ConvertToImage();

    GdkColor *colText = m_textForegroundColour.GetColor(),
             *colBack = m_textBackgroundColour.GetColor();

    bool textColSet = TRUE;

    unsigned char *data = image.GetData();

    // paint pixel by pixel
    for ( wxCoord srcX = 0; srcX < w; srcX++ )
    {
        for ( wxCoord srcY = 0; srcY < h; srcY++ )
        {
            // transform source coords to dest coords
            double r = sqrt((double)srcX*srcX + srcY*srcY);
            double angleOrig = atan2((double)srcY, (double)srcX) - rad;
            wxCoord dstX = (wxCoord)(r*cos(angleOrig) + 0.5),
                    dstY = (wxCoord)(r*sin(angleOrig) + 0.5);

            // black pixel?
            bool textPixel = data[(srcY*w + srcX)*3] == 0;
            if ( textPixel || (m_backgroundMode == wxSOLID) )
            {
                // change colour if needed
                if ( textPixel != textColSet )
                {
                    gdk_gc_set_foreground( m_textGC, textPixel ? colText
                                                               : colBack );

                    textColSet = textPixel;
                }

                // don't use DrawPoint() because it uses the current pen
                // colour, and we don't need it here
                gdk_draw_point( m_window, m_textGC,
                                XLOG2DEV(x) + dstX, YLOG2DEV(y) + dstY );
            }
        }
    }

    // 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

    // restore the font colour
    gdk_gc_set_foreground( m_textGC, colText );

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

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

    if (string.IsEmpty())
    {
        return;
    }
    
#ifdef __WXGTK20__
    // Set new font description
    if (theFont)
        pango_layout_set_font_description( m_layout, theFont->GetNativeFontInfo()->description );
        
    // Set layout's text
#if wxUSE_UNICODE
    const wxCharBuffer data = wxConvUTF8.cWC2MB( string );
    const char *dataUTF8 = (const char *)data;
#else
    const wxWCharBuffer wdata = wxConvLocal.cMB2WC( string );
    if ( !wdata )
    {
        if (width) (*width) = 0;
        if (height) (*height) = 0;
        return;
    }
    const wxCharBuffer data = wxConvUTF8.cWC2MB( wdata );
    const char *dataUTF8 = (const char *)data;
#endif

    if ( !dataUTF8 )
    {
        // hardly ideal, but what else can we do if conversion failed?
        return;
    }

    pango_layout_set_text( m_layout, dataUTF8, strlen(dataUTF8) );
 
    int w,h;
    pango_layout_get_pixel_size( m_layout, &w, &h );
    
    if (width)
        *width = (wxCoord) w; 
    if (height)
        *height = (wxCoord) h;
    if (descent)
    {
        PangoLayoutIter *iter = pango_layout_get_iter(m_layout);
        int baseline = pango_layout_iter_get_baseline(iter);
        pango_layout_iter_free(iter);
        *descent = h - PANGO_PIXELS(baseline);
    }
    
    // Reset old font description
    if (theFont)
        pango_layout_set_font_description( m_layout, m_fontdesc );
#else // GTK+ 1.x
    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);
#endif // GTK+ 2/1
}

wxCoord wxWindowDC::GetCharWidth() const
{
#ifdef __WXGTK20__
    pango_layout_set_text( m_layout, "H", 1 );
    int w,h;
    pango_layout_get_pixel_size( m_layout, &w, &h );
    return w;
#else
    GdkFont *font = m_font.GetInternalFont( m_scaleY );
    wxCHECK_MSG( font, -1, wxT("invalid font") );

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

wxCoord wxWindowDC::GetCharHeight() const
{
#ifdef __WXGTK20__
    pango_layout_set_text( m_layout, "H", 1 );
    int w,h;
    pango_layout_get_pixel_size( m_layout, &w, &h );
    return h;
#else
    GdkFont *font = m_font.GetInternalFont( m_scaleY );
    wxCHECK_MSG( font, -1, wxT("invalid font") );

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

void wxWindowDC::Clear()
{
    wxCHECK_RET( Ok(), 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 wxWindowDC::SetFont( const wxFont &font )
{
    m_font = font;
    
#ifdef __WXGTK20__
    if (m_font.Ok())
    {
        if (m_fontdesc)
            pango_font_description_free( m_fontdesc );
        
        m_fontdesc = pango_font_description_copy( m_font.GetNativeFontInfo()->description );
        
   
        if (m_owner)
        {
            PangoContext *oldContext = m_context;
            
            // We might want to use the X11 context for faster
            // rendering on screen
            if (m_font.GetNoAntiAliasing())
                m_context = m_owner->GtkGetPangoX11Context();
            else
                m_context = m_owner->GtkGetPangoDefaultContext();
                
            // If we switch back/forth between different contexts
            // we also have to create a new layout. I think so,
            // at least, and it doesn't hurt to do it. 
            if (oldContext != m_context)
            {
                if (m_layout)
                    g_object_unref( G_OBJECT( m_layout ) );
                
                m_layout = pango_layout_new( m_context );
            }
        }
        
        pango_layout_set_font_description( m_layout, m_fontdesc );
    }
#endif
}

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

    if (m_pen == pen) return;

    m_pen = pen;

    if (!m_pen.Ok()) 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 = (wxGTKDash*)NULL;
            req_nb_dash = 0;
            break;
        }
    }

#if (GTK_MINOR_VERSION > 0) || (GTK_MAJOR_VERSION > 1)
    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 );
        }
    }
#endif // GTK+ > 1.0

    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 wxWindowDC::SetBrush( const wxBrush &brush )
{
    wxCHECK_RET( Ok(), wxT("invalid window dc") );

    if (m_brush == brush) return;

    m_brush = brush;

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

void wxWindowDC::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( Ok(), wxT("invalid window dc") );

    if (m_backgroundBrush == brush) return;

    m_backgroundBrush = brush;

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

void wxWindowDC::SetLogicalFunction( int function )
{
    wxCHECK_RET( Ok(), 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;
#if (GTK_MINOR_VERSION > 0) || (GTK_MAJOR_VERSION > 1)
        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;
#endif // GTK+ > 1.0
        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 wxWindowDC::SetTextForeground( const wxColour &col )
{
    wxCHECK_RET( Ok(), 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.Ok() || (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 wxWindowDC::SetTextBackground( const wxColour &col )
{
    wxCHECK_RET( Ok(), wxT("invalid window dc") );

    // same as above
    if ( !col.Ok() || (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 wxWindowDC::SetBackgroundMode( int mode )
{
    wxCHECK_RET( Ok(), 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 wxWindowDC::SetPalette( const wxPalette& WXUNUSED(palette) )
{
    wxFAIL_MSG( wxT("wxWindowDC::SetPalette not implemented") );
}

void wxWindowDC::DoSetClippingRegion( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
{
    wxCHECK_RET( Ok(), 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 );
    wxDC::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 wxWindowDC::DoSetClippingRegionAsRegion( const wxRegion &region  )
{
    wxCHECK_RET( Ok(), 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 );
    wxDC::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 wxWindowDC::DestroyClippingRegion()
{
    wxCHECK_RET( Ok(), wxT("invalid window dc") );

    wxDC::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, (GdkRectangle *) NULL );
        gdk_gc_set_clip_rectangle( m_brushGC, (GdkRectangle *) NULL );
        gdk_gc_set_clip_rectangle( m_textGC, (GdkRectangle *) NULL );
        gdk_gc_set_clip_rectangle( m_bgGC, (GdkRectangle *) 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 wxWindowDC::Destroy()
{
    if (m_penGC) wxFreePoolGC( m_penGC );
    m_penGC = (GdkGC*) NULL;
    if (m_brushGC) wxFreePoolGC( m_brushGC );
    m_brushGC = (GdkGC*) NULL;
    if (m_textGC) wxFreePoolGC( m_textGC );
    m_textGC = (GdkGC*) NULL;
    if (m_bgGC) wxFreePoolGC( m_bgGC );
    m_bgGC = (GdkGC*) NULL;
}

void wxWindowDC::ComputeScaleAndOrigin()
{
    /* CMB: copy scale to see if it changes */
    double origScaleX = m_scaleX;
    double origScaleY = m_scaleY;

    wxDC::ComputeScaleAndOrigin();

    /* CMB: if scale has changed call SetPen to recalulate the line width */
    if ((m_scaleX != origScaleX || m_scaleY != origScaleY) &&
        (m_pen.Ok()))
    {
      /* 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 wxWindowDC::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 wxWindowDC::GetDepth() const
{
    wxFAIL_MSG(wxT("not implemented"));

    return -1;
}


//-----------------------------------------------------------------------------
// wxPaintDC
//-----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxPaintDC, wxClientDC)

// 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);
    }
}

wxPaintDC::wxPaintDC( wxWindow *win )
         : wxClientDC( 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
}

//-----------------------------------------------------------------------------
// wxClientDC
//-----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxClientDC, wxWindowDC)

wxClientDC::wxClientDC( wxWindow *win )
          : wxWindowDC( win )
{
    wxCHECK_RET( win, _T("NULL window in wxClientDC::wxClientDC") );

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

void wxClientDC::DoGetSize(int *width, int *height) const
{
    wxCHECK_RET( m_owner, _T("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();
}