[wxWidgets.git] / src / x11 / bitmap.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        bitmap.cpp
// Purpose:     wxBitmap
// Author:      Julian Smart, Robert Roebling
// Modified by:
// Created:     17/09/98
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart, Robert Roebling
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

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

#include "wx/bitmap.h"
#include "wx/icon.h"
#include "wx/log.h"
#include "wx/image.h"
#include "wx/app.h"

#include "wx/x11/private.h"

#if wxUSE_XPM
#if wxHAVE_LIB_XPM
#include <X11/xpm.h>
#else
#include "wx/xpmdecod.h"
#include "wx/wfstream.h"
#endif
#endif
#include <math.h>

//-----------------------------------------------------------------------------
// wxMask
//-----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxMask,wxObject)

wxMask::wxMask()
{
    m_bitmap = NULL;
    m_display = NULL;
}

wxMask::wxMask( const wxBitmap& bitmap, const wxColour& colour )
{
    m_bitmap = NULL;
    Create( bitmap, colour );
}

wxMask::wxMask( const wxBitmap& bitmap, int paletteIndex )
{
    m_bitmap = NULL;
    Create( bitmap, paletteIndex );
}

wxMask::wxMask( const wxBitmap& bitmap )
{
    m_bitmap = NULL;
    Create( bitmap );
}

wxMask::~wxMask()
{
    if (m_bitmap)
        XFreePixmap( (Display*) m_display, (Pixmap) m_bitmap );
}

bool wxMask::Create( const wxBitmap& bitmap,
                     const wxColour& colour )
{
    if (m_bitmap)
    {
        XFreePixmap( (Display*) m_display, (Pixmap) m_bitmap );
        m_bitmap = NULL;
    }

    m_display = bitmap.GetDisplay();

    wxImage image( bitmap );
    if (!image.Ok()) return FALSE;
    
    m_display = bitmap.GetDisplay();
    
    Display *xdisplay = (Display*) m_display;

    int xscreen = DefaultScreen( xdisplay );
    Window xroot = RootWindow( xdisplay, xscreen );
    Visual* xvisual = DefaultVisual( xdisplay, xscreen );
    int bpp = DefaultDepth( xdisplay, xscreen );
    
    m_bitmap = (WXPixmap) XCreatePixmap( xdisplay, xroot, image.GetWidth(), image.GetHeight(), 1 );
    GC gc = XCreateGC( xdisplay, (Pixmap) m_bitmap, 0, NULL );

    XSetForeground( xdisplay, gc, WhitePixel(xdisplay,xscreen) );
    XSetFillStyle( xdisplay, gc, FillSolid );
    XFillRectangle( xdisplay, (Pixmap) m_bitmap, gc, 0, 0, image.GetWidth(), image.GetHeight() );

    unsigned char *data = image.GetData();
    int index = 0;

    unsigned char red = colour.Red();
    unsigned char green = colour.Green();
    unsigned char blue = colour.Blue();

    XVisualInfo vinfo_template;
    XVisualInfo *vi;

    vinfo_template.visual = xvisual;
    vinfo_template.visualid = XVisualIDFromVisual( xvisual );
    vinfo_template.depth = bpp;
    int nitem = 0;

    vi = XGetVisualInfo( xdisplay, VisualIDMask|VisualDepthMask, &vinfo_template, &nitem );
    wxASSERT_MSG( vi, wxT("No visual info") );
    
    if ((bpp == 16) && (vi->red_mask != 0xf800)) bpp = 15;
    if (bpp == 15)
    {
        red = red & 0xf8;
        green = green & 0xf8;
        blue = blue & 0xf8;
    } else
    if (bpp == 16)
    {
        red = red & 0xf8;
        green = green & 0xfc;
        blue = blue & 0xf8;
    } else
    if (bpp == 12)
    {
        red = red & 0xf0;
        green = green & 0xf0;
        blue = blue & 0xf0;
    }

    XSetForeground( xdisplay, gc, BlackPixel(xdisplay,xscreen) );

    for (int j = 0; j < image.GetHeight(); j++)
    {
        int start_x = -1;
        int i;
        for (i = 0; i < image.GetWidth(); i++)
        {
            if ((data[index] == red) &&
                (data[index+1] == green) &&
                (data[index+2] == blue))
            {
                if (start_x == -1)
                start_x = i;
            }
            else
            {
                if (start_x != -1)
                {
                    XDrawLine( xdisplay, (Pixmap) m_bitmap, gc, start_x, j, i-1, j );
                    start_x = -1;
                }
            }
            index += 3;
        }
        if (start_x != -1)
            XDrawLine( xdisplay, (Pixmap) m_bitmap, gc, start_x, j, i, j );
    }
    
    XFreeGC( xdisplay, gc );

    return TRUE;
}

bool wxMask::Create( const wxBitmap& bitmap, int paletteIndex )
{
    unsigned char r,g,b;
    wxPalette *pal = bitmap.GetPalette();

    wxCHECK_MSG( pal, FALSE, wxT("Cannot create mask from bitmap without palette") );

    pal->GetRGB(paletteIndex, &r, &g, &b);

    return Create(bitmap, wxColour(r, g, b));
}

bool wxMask::Create( const wxBitmap& bitmap )
{
    if (m_bitmap)
    {
        XFreePixmap( (Display*) m_display, (Pixmap) m_bitmap );
        m_bitmap = NULL;
    }

    if (!bitmap.Ok()) return FALSE;

    wxCHECK_MSG( bitmap.GetBitmap(), FALSE, wxT("Cannot create mask from colour bitmap") );
    
    m_display = bitmap.GetDisplay();

    int xscreen = DefaultScreen( (Display*) m_display );
    Window xroot = RootWindow( (Display*) m_display, xscreen );
    
    m_bitmap = (WXPixmap) XCreatePixmap( (Display*) m_display, xroot, bitmap.GetWidth(), bitmap.GetHeight(), 1 );

    if (!m_bitmap) return FALSE;
    
    GC gc = XCreateGC( (Display*) m_display, (Pixmap) m_bitmap, 0, NULL );

    XCopyPlane( (Display*) m_display, (Pixmap) bitmap.GetBitmap(), (Pixmap) m_bitmap,
       gc, 0, 0, bitmap.GetWidth(), bitmap.GetHeight(), 0, 0, 1 );
       
    XFreeGC( (Display*) m_display, gc );

    return TRUE;
}

//-----------------------------------------------------------------------------
// wxBitmap
//-----------------------------------------------------------------------------

class wxBitmapRefData: public wxObjectRefData
{
public:
    wxBitmapRefData();
    ~wxBitmapRefData();

    WXPixmap        m_pixmap;
    WXPixmap        m_bitmap;
    WXDisplay      *m_display;
    wxMask         *m_mask;
    int             m_width;
    int             m_height;
    int             m_bpp;
    wxPalette      *m_palette;
};

wxBitmapRefData::wxBitmapRefData()
{
    m_pixmap = NULL;
    m_bitmap = NULL;
    m_display = NULL;
    m_mask = (wxMask *) NULL;
    m_width = 0;
    m_height = 0;
    m_bpp = 0;
    m_palette = (wxPalette *) NULL;
}

wxBitmapRefData::~wxBitmapRefData()
{
    if (m_pixmap) XFreePixmap( (Display*) m_display, (Pixmap) m_pixmap );
    if (m_bitmap) XFreePixmap( (Display*) m_display, (Pixmap) m_bitmap );
    if (m_mask) delete m_mask;
    if (m_palette) delete m_palette;
}

//-----------------------------------------------------------------------------

#define M_BMPDATA ((wxBitmapRefData *)m_refData)

IMPLEMENT_DYNAMIC_CLASS(wxBitmap,wxGDIObject)

wxBitmap::wxBitmap()
{
}

wxBitmap::wxBitmap( int width, int height, int depth )
{
    Create( width, height, depth );
}

bool wxBitmap::Create( int width, int height, int depth )
{
    UnRef();

    wxCHECK_MSG( (width > 0) && (height > 0), FALSE, wxT("invalid bitmap size") )

    m_refData = new wxBitmapRefData();
    
    M_BMPDATA->m_display = wxGlobalDisplay();
    
    wxASSERT_MSG( M_BMPDATA->m_display, wxT("No display") );
    
    int xscreen = DefaultScreen( (Display*) M_BMPDATA->m_display );
    Window xroot = RootWindow( (Display*) M_BMPDATA->m_display, xscreen );
    
    int bpp = DefaultDepth( (Display*) M_BMPDATA->m_display, xscreen );
    if (depth == -1) depth = bpp;

    wxCHECK_MSG( (depth == bpp) ||
                 (depth == 1), FALSE, wxT("invalid bitmap depth") )

    M_BMPDATA->m_mask = (wxMask *) NULL;
    M_BMPDATA->m_width = width;
    M_BMPDATA->m_height = height;
    if (depth == 1)
    {
        M_BMPDATA->m_bitmap = (WXPixmap) XCreatePixmap( (Display*) M_BMPDATA->m_display, xroot, width, height, 1 );
        
        wxASSERT_MSG( M_BMPDATA->m_bitmap, wxT("Bitmap creation failed") );
        
        M_BMPDATA->m_bpp = 1;
    }
    else
    {
        M_BMPDATA->m_pixmap = (WXPixmap) XCreatePixmap( (Display*) M_BMPDATA->m_display, xroot, width, height, depth );
        
        wxASSERT_MSG( M_BMPDATA->m_pixmap, wxT("Pixmap creation failed") );
        
        M_BMPDATA->m_bpp = depth;
    }

    return Ok();
}

bool wxBitmap::CreateFromXpm( const char **bits )
{
#if wxUSE_XPM
#if wxHAVE_LIB_XPM
    UnRef();

    wxCHECK_MSG( bits != NULL, FALSE, wxT("invalid bitmap data") )

    m_refData = new wxBitmapRefData();

    M_BMPDATA->m_display = wxGlobalDisplay();
    
    Display *xdisplay = (Display*) M_BMPDATA->m_display;
    
    int xscreen = DefaultScreen( xdisplay );
    Window xroot = RootWindow( xdisplay, xscreen );
    
    int bpp = DefaultDepth( xdisplay, xscreen );

    XpmAttributes xpmAttr;
    xpmAttr.valuemask = XpmReturnInfos;    // nothing yet, but get infos back

    Pixmap pixmap;
    Pixmap mask = 0;
    
    int ErrorStatus = XpmCreatePixmapFromData( xdisplay, xroot, (char**) bits, &pixmap, &mask, &xpmAttr );
    
    if (ErrorStatus == XpmSuccess)
    {
        M_BMPDATA->m_width = xpmAttr.width;
        M_BMPDATA->m_height = xpmAttr.height;

        M_BMPDATA->m_bpp = bpp;  // mono as well?

#if __WXDEBUG__
        unsigned int depthRet;
        int xRet, yRet;
        unsigned int widthRet, heightRet, borderWidthRet;
        XGetGeometry( xdisplay, pixmap, &xroot, &xRet, &yRet,
            &widthRet, &heightRet, &borderWidthRet, &depthRet);

        wxASSERT_MSG( bpp == (int)depthRet, wxT("colour depth mismatch") )
#endif

        XpmFreeAttributes(&xpmAttr);
        
        M_BMPDATA->m_pixmap = (WXPixmap) pixmap;
        
        if (mask)
        {
            M_BMPDATA->m_mask = new wxMask;
            M_BMPDATA->m_mask->SetBitmap( (WXPixmap) mask );
            M_BMPDATA->m_mask->SetDisplay( xdisplay );
        }
	return TRUE;
    }
    else
    {
        UnRef();
        
        return FALSE;
    }
#else
    wxXPMDecoder decoder;
    wxImage image(decoder.ReadData(bits));
    if (image.Ok())
	return CreateFromImage(image);
    else
	return FALSE;
#endif
#endif
    return FALSE;
}

bool wxBitmap::CreateFromImage( const wxImage& image, int depth )
{
    UnRef();

    wxCHECK_MSG( image.Ok(), FALSE, wxT("invalid image") )
    wxCHECK_MSG( depth == -1, FALSE, wxT("invalid bitmap depth") )

    m_refData = new wxBitmapRefData();

    M_BMPDATA->m_display = wxGlobalDisplay();
    
    Display *xdisplay = (Display*) M_BMPDATA->m_display;
    
    int xscreen = DefaultScreen( xdisplay );
    Window xroot = RootWindow( xdisplay, xscreen );
    Visual* xvisual = DefaultVisual( xdisplay, xscreen );
    
    int bpp = DefaultDepth( xdisplay, xscreen );
    
    int width = image.GetWidth();
    int height = image.GetHeight();
    M_BMPDATA->m_width = width;
    M_BMPDATA->m_height = height;

    if (depth != 1) depth = bpp;
    M_BMPDATA->m_bpp = depth;
    
    if (depth == 1)
    {
        wxFAIL_MSG( "mono images later" );
    }
    else
    {
        // Create image
    
        XImage *data_image = XCreateImage( xdisplay, xvisual, bpp, ZPixmap, 0, 0, width, height, 32, 0 );
        data_image->data = (char*) malloc( data_image->bytes_per_line * data_image->height );
    
        if (data_image->data == NULL)
        {
            wxLogError( wxT("Out of memory.") );  // TODO clean
            return FALSE;
        }

        M_BMPDATA->m_pixmap = (WXPixmap) XCreatePixmap( xdisplay, xroot, width, height, depth );

        // Create mask

        XImage *mask_image = (XImage*) NULL;
        if (image.HasMask())
        { 
            mask_image = XCreateImage( xdisplay, xvisual, 1, ZPixmap, 0, 0, width, height, 32, 0 );
            mask_image->data = (char*) malloc( mask_image->bytes_per_line * mask_image->height );
        
            if (mask_image->data == NULL)
            {
                wxLogError( wxT("Out of memory.") ); // TODO clean
                return FALSE;
            }
            
            wxMask *mask = new wxMask();
            mask->SetDisplay( xdisplay );
            mask->SetBitmap( (WXPixmap) XCreatePixmap( xdisplay, xroot, width, height, 1 ) );

            SetMask( mask );
        }

        // Retrieve info

        XVisualInfo vinfo_template;
        XVisualInfo *vi;

        vinfo_template.visual = xvisual;
        vinfo_template.visualid = XVisualIDFromVisual( xvisual );
        vinfo_template.depth = bpp;
        int nitem = 0;

        vi = XGetVisualInfo( xdisplay, VisualIDMask|VisualDepthMask, &vinfo_template, &nitem );
        wxASSERT_MSG( vi, wxT("No visual info") );

        if ((bpp == 16) && (vi->red_mask != 0xf800)) bpp = 15;
        if (bpp < 8) bpp = 8;

        // Render

        enum byte_order { RGB, RBG, BRG, BGR, GRB, GBR };
        byte_order b_o = RGB;

        if (bpp > 8)
        {
            if ((vi->red_mask > vi->green_mask) && (vi->green_mask > vi->blue_mask))      b_o = RGB;
            else if ((vi->red_mask > vi->blue_mask) && (vi->blue_mask > vi->green_mask))  b_o = RBG;
            else if ((vi->blue_mask > vi->red_mask) && (vi->red_mask > vi->green_mask))   b_o = BRG;
            else if ((vi->blue_mask > vi->green_mask) && (vi->green_mask > vi->red_mask)) b_o = BGR;
            else if ((vi->green_mask > vi->red_mask) && (vi->red_mask > vi->blue_mask))   b_o = GRB;
            else if ((vi->green_mask > vi->blue_mask) && (vi->blue_mask > vi->red_mask))  b_o = GBR;
        }

        XFree( vi );

        int r_mask = image.GetMaskRed();
        int g_mask = image.GetMaskGreen();
        int b_mask = image.GetMaskBlue();

        unsigned char* data = image.GetData();
        wxASSERT_MSG( data, "No image data" );

        bool hasMask = image.HasMask();

        int index = 0;
        for (int y = 0; y < height; y++)
        {
            for (int x = 0; x < width; x++)
            {
                int r = data[index];
                index++;
                int g = data[index];
                index++;
                int b = data[index];
                index++;

                if (hasMask)
                {
                    if ((r == r_mask) && (b == b_mask) && (g == g_mask))
                        XPutPixel( mask_image, x, y, 0 );
                    else
                        XPutPixel( mask_image, x, y, 1 );
                }

                switch (bpp)
                {
                    case 8:
                    {
                        int pixel = 0;
#if 0                        
                        if (wxTheApp->m_colorCube)
                        {
                            pixel = wxTheApp->m_colorCube[ ((r & 0xf8) << 7) + ((g & 0xf8) << 2) + ((b & 0xf8) >> 3) ];
                        }
                        else
                        {
                            GdkColormap *cmap = gtk_widget_get_default_colormap();
                            GdkColor *colors = cmap->colors;
                            int max = 3 * (65536);
    
                            for (int i = 0; i < cmap->size; i++)
                            {
                                int rdiff = (r << 8) - colors[i].red;
                                int gdiff = (g << 8) - colors[i].green;
                                int bdiff = (b << 8) - colors[i].blue;
                                int sum = ABS (rdiff) + ABS (gdiff) + ABS (bdiff);
                                if (sum < max) { pixel = i; max = sum; }
                            }
                        }
#endif    
                        XPutPixel( data_image, x, y, pixel );
                        break;
                    }
                    case 12:  // SGI only
                    {
                        int pixel = 0;
                        switch (b_o)
                        {
                            case RGB: pixel = ((r & 0xf0) << 4) | (g & 0xf0) | ((b & 0xf0) >> 4); break;
                            case RBG: pixel = ((r & 0xf0) << 4) | (b & 0xf0) | ((g & 0xf0) >> 4); break;
                            case GRB: pixel = ((g & 0xf0) << 4) | (r & 0xf0) | ((b & 0xf0) >> 4); break;
                            case GBR: pixel = ((g & 0xf0) << 4) | (b & 0xf0) | ((r & 0xf0) >> 4); break;
                            case BRG: pixel = ((b & 0xf0) << 4) | (r & 0xf0) | ((g & 0xf0) >> 4); break;
                            case BGR: pixel = ((b & 0xf0) << 4) | (g & 0xf0) | ((r & 0xf0) >> 4); break;
                        }
                        XPutPixel( data_image, x, y, pixel );
                        break;
                    }
                    case 15:
                    {
                        int pixel = 0;
                        switch (b_o)
                        {
                            case RGB: pixel = ((r & 0xf8) << 7) | ((g & 0xf8) << 2) | ((b & 0xf8) >> 3); break;
                            case RBG: pixel = ((r & 0xf8) << 7) | ((b & 0xf8) << 2) | ((g & 0xf8) >> 3); break;
                            case GRB: pixel = ((g & 0xf8) << 7) | ((r & 0xf8) << 2) | ((b & 0xf8) >> 3); break;
                            case GBR: pixel = ((g & 0xf8) << 7) | ((b & 0xf8) << 2) | ((r & 0xf8) >> 3); break;
                            case BRG: pixel = ((b & 0xf8) << 7) | ((r & 0xf8) << 2) | ((g & 0xf8) >> 3); break;
                            case BGR: pixel = ((b & 0xf8) << 7) | ((g & 0xf8) << 2) | ((r & 0xf8) >> 3); break;
                        }
                        XPutPixel( data_image, x, y, pixel );
                        break;
                    }
                    case 16:
                    {
                        // I actually don't know if for 16-bit displays, it is alway the green
                        // component or the second component which has 6 bits.
                        int pixel = 0;
                        switch (b_o)
                        {
                            case RGB: pixel = ((r & 0xf8) << 8) | ((g & 0xfc) << 3) | ((b & 0xf8) >> 3); break;
                            case RBG: pixel = ((r & 0xf8) << 8) | ((b & 0xfc) << 3) | ((g & 0xf8) >> 3); break;
                            case GRB: pixel = ((g & 0xf8) << 8) | ((r & 0xfc) << 3) | ((b & 0xf8) >> 3); break;
                            case GBR: pixel = ((g & 0xf8) << 8) | ((b & 0xfc) << 3) | ((r & 0xf8) >> 3); break;
                            case BRG: pixel = ((b & 0xf8) << 8) | ((r & 0xfc) << 3) | ((g & 0xf8) >> 3); break;
                            case BGR: pixel = ((b & 0xf8) << 8) | ((g & 0xfc) << 3) | ((r & 0xf8) >> 3); break;
                        }
                        XPutPixel( data_image, x, y, pixel );
                        break;
                    }
                    case 32:
                    case 24:
                    {
                        int pixel = 0;
                        switch (b_o)
                        {
                            case RGB: pixel = (r << 16) | (g << 8) | b; break;
                            case RBG: pixel = (r << 16) | (b << 8) | g; break;
                            case BRG: pixel = (b << 16) | (r << 8) | g; break;
                            case BGR: pixel = (b << 16) | (g << 8) | r; break;
                            case GRB: pixel = (g << 16) | (r << 8) | b; break;
                            case GBR: pixel = (g << 16) | (b << 8) | r; break;
                        }
                        XPutPixel( data_image, x, y, pixel );
                    }
                    default: break;
                }
            } // for
        }  // for

        // Blit picture

        GC gc = XCreateGC( xdisplay, (Pixmap) M_BMPDATA->m_pixmap, 0, NULL );
        XPutImage( xdisplay, (Pixmap) M_BMPDATA->m_pixmap, gc, data_image, 0, 0, 0, 0, width, height );
#ifdef __WXDEBUG__
	XSync(wxGlobalDisplay(), False);
#endif

        XDestroyImage( data_image );
        XFreeGC( xdisplay, gc );

        // Blit mask
        
        if (image.HasMask())
        {
            GC gc = XCreateGC( xdisplay, (Pixmap) GetMask()->GetBitmap(), 0, NULL );
            XPutImage( xdisplay, (Pixmap) GetMask()->GetBitmap(), gc, data_image, 0, 0, 0, 0, width, height );

            XDestroyImage( mask_image );
            XFreeGC( xdisplay, gc );
        }
    }

    return TRUE;
}

static void wxCalcPrecAndShift( unsigned long mask, int *shift, int *prec )
{
  *shift = 0;
  *prec = 0;

  while (!(mask & 0x1))
    {
      (*shift)++;
      mask >>= 1;
    }

  while (mask & 0x1)
    {
      (*prec)++;
      mask >>= 1;
    }
}

wxImage wxBitmap::ConvertToImage() const
{
    wxImage image;

    wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );

    Display *xdisplay = (Display*) M_BMPDATA->m_display;
    wxASSERT_MSG( xdisplay, wxT("No display") );
    
    int xscreen = DefaultScreen( xdisplay );
    Visual* xvisual = DefaultVisual( xdisplay, xscreen );
    
    int bpp = DefaultDepth( xdisplay, xscreen );
    
    XImage *x_image = NULL;
    if (GetPixmap())
    {
        x_image = XGetImage( xdisplay, (Pixmap) GetPixmap(),
            0, 0,
            GetWidth(), GetHeight(),
            AllPlanes, ZPixmap );
    } else
    if (GetBitmap())
    {
        x_image = XGetImage( xdisplay, (Pixmap) GetBitmap(),
            0, 0,
            GetWidth(), GetHeight(),
            AllPlanes, ZPixmap );
    } else
    {
        wxFAIL_MSG( wxT("Ill-formed bitmap") );
    }

    wxCHECK_MSG( x_image, wxNullImage, wxT("couldn't create image") );

    image.Create( GetWidth(), GetHeight() );
    char unsigned *data = image.GetData();

    if (!data)
    {
        XDestroyImage( x_image );
        wxFAIL_MSG( wxT("couldn't create image") );
        return wxNullImage;
    }

    XImage *x_image_mask = NULL;
    if (GetMask())
    {
        x_image_mask = XGetImage( xdisplay, (Pixmap) GetMask()->GetBitmap(),
            0, 0,
            GetWidth(), GetHeight(), 
            AllPlanes, ZPixmap );

        image.SetMaskColour( 16, 16, 16 );  // anything unlikely and dividable
    }

    int red_shift_right = 0;
    int green_shift_right = 0;
    int blue_shift_right = 0;
    int red_shift_left = 0;
    int green_shift_left = 0;
    int blue_shift_left = 0;
    bool use_shift = FALSE;

    if (GetPixmap())
    {
        // Retrieve info

        XVisualInfo vinfo_template;
        XVisualInfo *vi;

        vinfo_template.visual = xvisual;
        vinfo_template.visualid = XVisualIDFromVisual( xvisual );
        vinfo_template.depth = bpp;
        int nitem = 0;

        vi = XGetVisualInfo( xdisplay, VisualIDMask|VisualDepthMask, &vinfo_template, &nitem );
        wxASSERT_MSG( vi, wxT("No visual info") );
        
        int red_prec,green_prec,blue_prec;
        int red_shift,green_shift,blue_shift;
        wxCalcPrecAndShift( vi->red_mask, &red_shift, &red_prec );
        wxCalcPrecAndShift( vi->green_mask, &green_shift, &green_prec );
        wxCalcPrecAndShift( vi->blue_mask, &blue_shift, &blue_prec );
        if (bpp == 16) bpp = red_prec + green_prec + blue_prec;
        
        red_shift_right = red_shift;
        red_shift_left = 8-red_prec;
        green_shift_right = green_shift;
        green_shift_left = 8-green_prec;
        blue_shift_right = blue_shift;
        blue_shift_left = 8-blue_prec;
        
#if 0
        use_shift = (vi->visual->c_class == TrueColor) || (vi->visual->c_class == DirectColor);
#else
        use_shift = TRUE;
#endif
        
        XFree( vi );
    }
    if (GetBitmap())
    {
        bpp = 1;
    }


//    GdkColormap *cmap = gtk_widget_get_default_colormap();

    long pos = 0;
    for (int j = 0; j < GetHeight(); j++)
    {
        for (int i = 0; i < GetWidth(); i++)
        {
            unsigned long pixel = XGetPixel( x_image, i, j );
            if (bpp == 1)
            {
                if (pixel == 0)
                {
                    data[pos]   = 0;
                    data[pos+1] = 0;
                    data[pos+2] = 0;
                }
                else
                {
                    data[pos]   = 255;
                    data[pos+1] = 255;
                    data[pos+2] = 255;
                }
            }
            else if (use_shift)
            {
                data[pos] =   (pixel >> red_shift_right)   << red_shift_left;
                data[pos+1] = (pixel >> green_shift_right) << green_shift_left;
                data[pos+2] = (pixel >> blue_shift_right)  << blue_shift_left;
            }
#if 0
            else if (cmap->colors)
            {
                data[pos] =   cmap->colors[pixel].red   >> 8;
                data[pos+1] = cmap->colors[pixel].green >> 8;
                data[pos+2] = cmap->colors[pixel].blue  >> 8;
            }
#endif
            else
            {
                wxFAIL_MSG( wxT("Image conversion failed. Unknown visual type.") );
            }

            if (x_image_mask)
            {
                int mask_pixel = XGetPixel( x_image_mask, i, j );
                if (mask_pixel == 0)
                {
                    data[pos] = 16;
                    data[pos+1] = 16;
                    data[pos+2] = 16;
                }
            }

            pos += 3;
        }
    }

    XDestroyImage( x_image );
    if (x_image_mask) XDestroyImage( x_image_mask );

    return image;
}

wxBitmap::wxBitmap( const wxBitmap& bmp )
{
    Ref( bmp );
}

wxBitmap::wxBitmap( const wxString &filename, int type )
{
    LoadFile( filename, type );
}

wxBitmap::wxBitmap( const char bits[], int width, int height, int WXUNUSED(depth) )
{
    m_refData = new wxBitmapRefData();

    M_BMPDATA->m_display = wxGlobalDisplay();

    Display *xdisplay = (Display*) M_BMPDATA->m_display;
    
    int xscreen = DefaultScreen( xdisplay );
    Window xroot = RootWindow( xdisplay, xscreen );
    
    M_BMPDATA->m_mask = (wxMask *) NULL;
    M_BMPDATA->m_bitmap = (WXPixmap) XCreateBitmapFromData( xdisplay, xroot, (char *) bits, width, height );
    M_BMPDATA->m_width = width;
    M_BMPDATA->m_height = height;
    M_BMPDATA->m_bpp = 1;

    wxCHECK_RET( M_BMPDATA->m_bitmap, wxT("couldn't create bitmap") );
}

wxBitmap::~wxBitmap()
{
}

wxBitmap& wxBitmap::operator = ( const wxBitmap& bmp )
{
    if ( m_refData != bmp.m_refData )
        Ref( bmp );

    return *this;
}

bool wxBitmap::operator == ( const wxBitmap& bmp ) const
{
    return m_refData == bmp.m_refData;
}

bool wxBitmap::operator != ( const wxBitmap& bmp ) const
{
    return m_refData != bmp.m_refData;
}

bool wxBitmap::Ok() const
{
    return (m_refData != NULL);
}

int wxBitmap::GetHeight() const
{
    wxCHECK_MSG( Ok(), -1, wxT("invalid bitmap") );

    return M_BMPDATA->m_height;
}

int wxBitmap::GetWidth() const
{
    wxCHECK_MSG( Ok(), -1, wxT("invalid bitmap") );

    return M_BMPDATA->m_width;
}

int wxBitmap::GetDepth() const
{
    wxCHECK_MSG( Ok(), -1, wxT("invalid bitmap") );

    return M_BMPDATA->m_bpp;
}

wxMask *wxBitmap::GetMask() const
{
    wxCHECK_MSG( Ok(), (wxMask *) NULL, wxT("invalid bitmap") );

    return M_BMPDATA->m_mask;
}

void wxBitmap::SetMask( wxMask *mask )
{
    wxCHECK_RET( Ok(), wxT("invalid bitmap") );

    if (M_BMPDATA->m_mask) delete M_BMPDATA->m_mask;

    M_BMPDATA->m_mask = mask;
}

bool wxBitmap::CopyFromIcon(const wxIcon& icon)
{
    *this = icon;
    return TRUE;
}

wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
{
    wxCHECK_MSG( Ok() &&
                 (rect.x >= 0) && (rect.y >= 0) &&
                 (rect.x+rect.width <= M_BMPDATA->m_width) && (rect.y+rect.height <= M_BMPDATA->m_height),
                 wxNullBitmap, wxT("invalid bitmap or bitmap region") );

    wxBitmap ret( rect.width, rect.height, M_BMPDATA->m_bpp );
    wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );

    
    wxFAIL_MSG( "wxBitmap::GetSubBitmap not yet implemented" );
    
#if 0
    if (ret.GetPixmap())
    {
        GdkGC *gc = gdk_gc_new( ret.GetPixmap() );
        gdk_draw_pixmap( ret.GetPixmap(), gc, GetPixmap(), rect.x, rect.y, 0, 0, rect.width, rect.height );
        gdk_gc_destroy( gc );
    }
    else
    {
        GdkGC *gc = gdk_gc_new( ret.GetBitmap() );
        gdk_wx_draw_bitmap( ret.GetBitmap(), gc, GetBitmap(), rect.x, rect.y, 0, 0, rect.width, rect.height );
        gdk_gc_destroy( gc );
    }

    if (GetMask())
    {
        wxMask *mask = new wxMask;
        mask->m_bitmap = gdk_pixmap_new( wxGetRootWindow()->window, rect.width, rect.height, 1 );

        GdkGC *gc = gdk_gc_new( mask->m_bitmap );
        gdk_wx_draw_bitmap( mask->m_bitmap, gc, M_BMPDATA->m_mask->m_bitmap, 0, 0, rect.x, rect.y, rect.width, rect.height );
        gdk_gc_destroy( gc );

        ret.SetMask( mask );
    }
#endif

    return ret;
}

bool wxBitmap::SaveFile( const wxString &name, int type, wxPalette *WXUNUSED(palette) )
{
    wxCHECK_MSG( Ok(), FALSE, wxT("invalid bitmap") );

    // Try to save the bitmap via wxImage handlers:
    {
        wxImage image( *this );
        if (image.Ok()) return image.SaveFile( name, type );
    }

    return FALSE;
}

bool wxBitmap::LoadFile( const wxString &name, int type )
{
    UnRef();

    if (!wxFileExists(name)) return FALSE;


    if (type == wxBITMAP_TYPE_XPM)
    {
#if wxUSE_XPM
#if wxHAVE_LIB_XPM
        m_refData = new wxBitmapRefData();

        M_BMPDATA->m_display = wxGlobalDisplay();
    
        Display *xdisplay = (Display*) M_BMPDATA->m_display;
    
        int xscreen = DefaultScreen( xdisplay );
        Window xroot = RootWindow( xdisplay, xscreen );
    
        int bpp = DefaultDepth( xdisplay, xscreen );

        XpmAttributes xpmAttr;
        xpmAttr.valuemask = XpmReturnInfos;    // nothing yet, but get infos back

        Pixmap pixmap;
        Pixmap mask = 0;
    
        int ErrorStatus = XpmReadFileToPixmap( xdisplay, xroot, (char*) name.c_str(), &pixmap, &mask, &xpmAttr);
    
        if (ErrorStatus == XpmSuccess)
        {
            M_BMPDATA->m_width = xpmAttr.width;
            M_BMPDATA->m_height = xpmAttr.height;

            M_BMPDATA->m_bpp = bpp;  // mono as well?

            XpmFreeAttributes(&xpmAttr);
        
            M_BMPDATA->m_bitmap = (WXPixmap) pixmap;
        
            if (mask)
            {
                M_BMPDATA->m_mask = new wxMask;
                M_BMPDATA->m_mask->SetBitmap( (WXPixmap) mask );
                M_BMPDATA->m_mask->SetDisplay( xdisplay );
            }
        }
        else
        {
            UnRef();
            
            return FALSE;
        }
#else
#if wxUSE_STREAMS
	wxXPMDecoder decoder;
	wxFileInputStream stream(name);
	if (stream.Ok())
	{
            wxImage image(decoder.Read(stream));
	    if (image.Ok())
		return CreateFromImage(image);
	    else
		return FALSE;
	}
	else
	    return FALSE;
#else
	return FALSE;
#endif
	// wxUSE_STREAMS
#endif
	// wxHAVE_LIB_XPM
#endif
	// wxUSE_XPM
	return FALSE;
    }
    else // try if wxImage can load it
    {
        wxImage image;
        if (!image.LoadFile( name, type )) return FALSE;
        if (image.Ok()) *this = image.ConvertToBitmap();
        else return FALSE;
    }

    return TRUE;
}

wxPalette *wxBitmap::GetPalette() const
{
    if (!Ok()) return (wxPalette *) NULL;

    return M_BMPDATA->m_palette;
}

void wxBitmap::SetHeight( int height )
{
    if (!m_refData) m_refData = new wxBitmapRefData();

    M_BMPDATA->m_height = height;
}

void wxBitmap::SetWidth( int width )
{
    if (!m_refData) m_refData = new wxBitmapRefData();

    M_BMPDATA->m_width = width;
}

void wxBitmap::SetDepth( int depth )
{
    if (!m_refData) m_refData = new wxBitmapRefData();

    M_BMPDATA->m_bpp = depth;
}

void wxBitmap::SetPixmap( WXPixmap pixmap )
{
    if (!m_refData) m_refData = new wxBitmapRefData();

    M_BMPDATA->m_pixmap = pixmap;
}

void wxBitmap::SetBitmap( WXPixmap bitmap )
{
    if (!m_refData) m_refData = new wxBitmapRefData();

    M_BMPDATA->m_bitmap = bitmap;
}

WXPixmap wxBitmap::GetPixmap() const
{
    wxCHECK_MSG( Ok(), (WXPixmap) NULL, wxT("invalid bitmap") );

    return M_BMPDATA->m_pixmap;
}

WXPixmap wxBitmap::GetBitmap() const
{
    wxCHECK_MSG( Ok(), (WXPixmap) NULL, wxT("invalid bitmap") );

    return M_BMPDATA->m_bitmap;
}

WXDisplay *wxBitmap::GetDisplay() const
{
    wxCHECK_MSG( Ok(), (WXDisplay*) NULL, wxT("invalid bitmap") );

    return M_BMPDATA->m_display;
}