X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/781945ea412f924ad456adbf1830dc355fb573b6..bd2333878268a776100e6f14aab9a313891ba40f:/src/common/image.cpp

diff --git a/src/common/image.cpp b/src/common/image.cpp
index cc9834d4d6..4fb2b0c254 100644
--- a/src/common/image.cpp
+++ b/src/common/image.cpp
@@ -16,31 +16,52 @@
 
 #if wxUSE_IMAGE
 
+#include "wx/image.h"
+
 #ifndef WX_PRECOMP
     #include "wx/log.h"
-    #include "wx/app.h"
     #include "wx/hash.h"
+    #include "wx/utils.h"
+    #include "wx/math.h"
+    #include "wx/module.h"
+    #include "wx/palette.h"
+    #include "wx/intl.h"
+    #include "wx/colour.h"
 #endif
 
-#include "wx/image.h"
-#include "wx/bitmap.h"
-#include "wx/debug.h"
 #include "wx/filefn.h"
 #include "wx/wfstream.h"
-#include "wx/intl.h"
-#include "wx/module.h"
-#include "wx/utils.h"
-#include "wx/math.h"
-
-#if wxUSE_XPM
-    #include "wx/xpmdecod.h"
-#endif
+#include "wx/xpmdecod.h"
 
 // For memcpy
 #include <string.h>
 
+// make the code compile with either wxFile*Stream or wxFFile*Stream:
+#define HAS_FILE_STREAMS (wxUSE_STREAMS && (wxUSE_FILE || wxUSE_FFILE))
+
+#if HAS_FILE_STREAMS
+    #if wxUSE_FFILE
+        typedef wxFFileInputStream wxImageFileInputStream;
+        typedef wxFFileOutputStream wxImageFileOutputStream;
+    #elif wxUSE_FILE
+        typedef wxFileInputStream wxImageFileInputStream;
+        typedef wxFileOutputStream wxImageFileOutputStream;
+    #endif // wxUSE_FILE/wxUSE_FFILE
+#endif // HAS_FILE_STREAMS
+
+#if wxUSE_VARIANT
+IMPLEMENT_VARIANT_OBJECT_EXPORTED_SHALLOWCMP(wxImage,WXDLLEXPORT)
+#endif
+
 //-----------------------------------------------------------------------------
-// wxImage
+// global data
+//-----------------------------------------------------------------------------
+
+wxList wxImage::sm_handlers;
+wxImage wxNullImage;
+
+//-----------------------------------------------------------------------------
+// wxImageRefData
 //-----------------------------------------------------------------------------
 
 class wxImageRefData: public wxObjectRefData
@@ -51,6 +72,7 @@ public:
 
     int             m_width;
     int             m_height;
+    wxBitmapType    m_type;
     unsigned char  *m_data;
 
     bool            m_hasMask;
@@ -74,13 +96,14 @@ public:
     wxArrayString   m_optionNames;
     wxArrayString   m_optionValues;
 
-    DECLARE_NO_COPY_CLASS(wxImageRefData)
+    wxDECLARE_NO_COPY_CLASS(wxImageRefData);
 };
 
 wxImageRefData::wxImageRefData()
 {
     m_width = 0;
     m_height = 0;
+    m_type = wxBITMAP_TYPE_INVALID;
     m_data =
     m_alpha = (unsigned char *) NULL;
 
@@ -102,64 +125,16 @@ wxImageRefData::~wxImageRefData()
         free( m_alpha );
 }
 
-wxList wxImage::sm_handlers;
-
-wxImage wxNullImage;
 
+//-----------------------------------------------------------------------------
+// wxImage
 //-----------------------------------------------------------------------------
 
-#define M_IMGDATA ((wxImageRefData *)m_refData)
+#define M_IMGDATA static_cast<wxImageRefData*>(m_refData)
 
 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
 
-wxImage::wxImage( int width, int height, bool clear )
-{
-    Create( width, height, clear );
-}
-
-wxImage::wxImage( int width, int height, unsigned char* data, bool static_data )
-{
-    Create( width, height, data, static_data );
-}
-
-wxImage::wxImage( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
-{
-    Create( width, height, data, alpha, static_data );
-}
-
-wxImage::wxImage( const wxString& name, long type, int index )
-{
-    LoadFile( name, type, index );
-}
-
-wxImage::wxImage( const wxString& name, const wxString& mimetype, int index )
-{
-    LoadFile( name, mimetype, index );
-}
-
-#if wxUSE_STREAMS
-wxImage::wxImage( wxInputStream& stream, long type, int index )
-{
-    LoadFile( stream, type, index );
-}
-
-wxImage::wxImage( wxInputStream& stream, const wxString& mimetype, int index )
-{
-    LoadFile( stream, mimetype, index );
-}
-#endif // wxUSE_STREAMS
-
-wxImage::wxImage( const char** xpmData )
-{
-    Create(xpmData);
-}
-
-wxImage::wxImage( char** xpmData )
-{
-    Create((const char**) xpmData);
-}
-
-bool wxImage::Create( const char** xpmData )
+bool wxImage::Create(const char* const* xpmData)
 {
 #if wxUSE_XPM
     UnRef();
@@ -185,13 +160,15 @@ bool wxImage::Create( int width, int height, bool clear )
         return false;
     }
 
-    if (clear)
-        memset(M_IMGDATA->m_data, 0, width*height*3);
-
     M_IMGDATA->m_width = width;
     M_IMGDATA->m_height = height;
     M_IMGDATA->m_ok = true;
 
+    if (clear)
+    {
+        Clear();
+    }
+
     return true;
 }
 
@@ -199,7 +176,7 @@ bool wxImage::Create( int width, int height, unsigned char* data, bool static_da
 {
     UnRef();
 
-    wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
+    wxCHECK_MSG( data, false, wxT("NULL data in wxImage::Create") );
 
     m_refData = new wxImageRefData();
 
@@ -216,7 +193,7 @@ bool wxImage::Create( int width, int height, unsigned char* data, unsigned char*
 {
     UnRef();
 
-    wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
+    wxCHECK_MSG( data, false, wxT("NULL data in wxImage::Create") );
 
     m_refData = new wxImageRefData();
 
@@ -226,6 +203,7 @@ bool wxImage::Create( int width, int height, unsigned char* data, unsigned char*
     M_IMGDATA->m_height = height;
     M_IMGDATA->m_ok = true;
     M_IMGDATA->m_static = static_data;
+    M_IMGDATA->m_staticAlpha = static_data;
 
     return true;
 }
@@ -235,36 +213,53 @@ void wxImage::Destroy()
     UnRef();
 }
 
-wxImage wxImage::Copy() const
+void wxImage::Clear(unsigned char value)
 {
-    wxImage image;
-
-    wxCHECK_MSG( Ok(), image, wxT("invalid image") );
-
-    image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
-
-    unsigned char *data = image.GetData();
-
-    wxCHECK_MSG( data, image, wxT("unable to create image") );
-
-    image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
-    image.SetMask( M_IMGDATA->m_hasMask );
+    memset(M_IMGDATA->m_data, value, M_IMGDATA->m_width*M_IMGDATA->m_height*3);
+}
 
-    memcpy( data, GetData(), M_IMGDATA->m_width*M_IMGDATA->m_height*3 );
+wxObjectRefData* wxImage::CreateRefData() const
+{
+    return new wxImageRefData;
+}
 
-    wxImageRefData *imgData = (wxImageRefData *)image.m_refData;
+wxObjectRefData* wxImage::CloneRefData(const wxObjectRefData* that) const
+{
+    const wxImageRefData* refData = static_cast<const wxImageRefData*>(that);
+    wxCHECK_MSG(refData->m_ok, NULL, wxT("invalid image") );
 
-    // also copy the alpha channel
-    if (HasAlpha())
+    wxImageRefData* refData_new = new wxImageRefData;
+    refData_new->m_width = refData->m_width;
+    refData_new->m_height = refData->m_height;
+    refData_new->m_maskRed = refData->m_maskRed;
+    refData_new->m_maskGreen = refData->m_maskGreen;
+    refData_new->m_maskBlue = refData->m_maskBlue;
+    refData_new->m_hasMask = refData->m_hasMask;
+    refData_new->m_ok = true;
+    unsigned size = unsigned(refData->m_width) * unsigned(refData->m_height);
+    if (refData->m_alpha != NULL)
     {
-        image.SetAlpha();
-        unsigned char* alpha = image.GetAlpha();
-        memcpy( alpha, GetAlpha(), M_IMGDATA->m_width*M_IMGDATA->m_height );
+        refData_new->m_alpha = (unsigned char*)malloc(size);
+        memcpy(refData_new->m_alpha, refData->m_alpha, size);
     }
+    size *= 3;
+    refData_new->m_data = (unsigned char*)malloc(size);
+    memcpy(refData_new->m_data, refData->m_data, size);
+#if wxUSE_PALETTE
+    refData_new->m_palette = refData->m_palette;
+#endif
+    refData_new->m_optionNames = refData->m_optionNames;
+    refData_new->m_optionValues = refData->m_optionValues;
+    return refData_new;
+}
+
+wxImage wxImage::Copy() const
+{
+    wxImage image;
 
-    // also copy the image options
-    imgData->m_optionNames = M_IMGDATA->m_optionNames;
-    imgData->m_optionValues = M_IMGDATA->m_optionValues;
+    wxCHECK_MSG( Ok(), image, wxT("invalid image") );
+
+    image.m_refData = CloneRefData(m_refData);
 
     return image;
 }
@@ -272,7 +267,7 @@ wxImage wxImage::Copy() const
 wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
 {
     if( xFactor == 1 && yFactor == 1 )
-        return Copy() ;
+        return *this;
 
     wxImage image;
 
@@ -390,7 +385,8 @@ wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
     return image;
 }
 
-wxImage wxImage::Scale( int width, int height ) const
+wxImage
+wxImage::Scale( int width, int height, wxImageResizeQuality quality ) const
 {
     wxImage image;
 
@@ -405,11 +401,61 @@ wxImage wxImage::Scale( int width, int height ) const
     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
                  wxT("invalid old image size") );
 
-    if ( old_width % width == 0 && old_width >= width &&
-        old_height % height == 0 && old_height >= height )
+    // If the image's new width and height are the same as the original, no
+    // need to waste time or CPU cycles
+    if ( old_width == width && old_height == height )
+        return *this;
+
+    // resample the image using either the nearest neighbourhood, bilinear or
+    // bicubic method as specified
+    switch ( quality )
+    {
+        case wxIMAGE_QUALITY_BICUBIC:
+        case wxIMAGE_QUALITY_BILINEAR:
+            // both of these algorithms should be used for up-sampling the
+            // image only, when down-sampling always use box averaging for best
+            // results
+            if ( width < old_width && height < old_height )
+                image = ResampleBox(width, height);
+            else if ( quality == wxIMAGE_QUALITY_BILINEAR )
+                image = ResampleBilinear(width, height);
+            else if ( quality == wxIMAGE_QUALITY_BICUBIC )
+                image = ResampleBicubic(width, height);
+            break;
+
+        case wxIMAGE_QUALITY_NEAREST:
+            if ( old_width % width == 0 && old_width >= width &&
+                old_height % height == 0 && old_height >= height )
+            {
+                return ShrinkBy( old_width / width , old_height / height );
+            }
+
+            image = ResampleNearest(width, height);
+            break;
+    }
+
+    // If the original image has a mask, apply the mask to the new image
+    if (M_IMGDATA->m_hasMask)
     {
-        return ShrinkBy( old_width / width , old_height / height ) ;
+        image.SetMaskColour( M_IMGDATA->m_maskRed,
+                            M_IMGDATA->m_maskGreen,
+                            M_IMGDATA->m_maskBlue );
     }
+
+    // In case this is a cursor, make sure the hotspot is scaled accordingly:
+    if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
+        image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
+                (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X)*width)/old_width);
+    if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
+        image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
+                (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y)*height)/old_height);
+
+    return image;
+}
+
+wxImage wxImage::ResampleNearest(int width, int height) const
+{
+    wxImage image;
     image.Create( width, height, false );
 
     unsigned char *data = image.GetData();
@@ -421,13 +467,7 @@ wxImage wxImage::Scale( int width, int height ) const
     unsigned char *source_alpha = 0 ;
     unsigned char *target_alpha = 0 ;
 
-    if (M_IMGDATA->m_hasMask)
-    {
-        image.SetMaskColour( M_IMGDATA->m_maskRed,
-                             M_IMGDATA->m_maskGreen,
-                             M_IMGDATA->m_maskBlue );
-    }
-    else
+    if ( !M_IMGDATA->m_hasMask )
     {
         source_alpha = M_IMGDATA->m_alpha ;
         if ( source_alpha )
@@ -437,6 +477,8 @@ wxImage wxImage::Scale( int width, int height ) const
         }
     }
 
+    long old_height = M_IMGDATA->m_height,
+         old_width  = M_IMGDATA->m_width;
     long x_delta = (old_width<<16) / width;
     long y_delta = (old_height<<16) / height;
 
@@ -444,38 +486,573 @@ wxImage wxImage::Scale( int width, int height ) const
 
     long y = 0;
     for ( long j = 0; j < height; j++ )
-        {
+    {
         unsigned char* src_line = &source_data[(y>>16)*old_width*3];
         unsigned char* src_alpha_line = source_alpha ? &source_alpha[(y>>16)*old_width] : 0 ;
 
         long x = 0;
         for ( long i = 0; i < width; i++ )
         {
-             unsigned char* src_pixel = &src_line[(x>>16)*3];
-             unsigned char* src_alpha_pixel = source_alpha ? &src_alpha_line[(x>>16)] : 0 ;
-             dest_pixel[0] = src_pixel[0];
-             dest_pixel[1] = src_pixel[1];
-             dest_pixel[2] = src_pixel[2];
-             dest_pixel += 3;
-             if ( source_alpha )
+            unsigned char* src_pixel = &src_line[(x>>16)*3];
+            unsigned char* src_alpha_pixel = source_alpha ? &src_alpha_line[(x>>16)] : 0 ;
+            dest_pixel[0] = src_pixel[0];
+            dest_pixel[1] = src_pixel[1];
+            dest_pixel[2] = src_pixel[2];
+            dest_pixel += 3;
+            if ( source_alpha )
                 *(target_alpha++) = *src_alpha_pixel ;
-             x += x_delta;
+            x += x_delta;
         }
 
         y += y_delta;
     }
 
-    // In case this is a cursor, make sure the hotspot is scaled accordingly:
-    if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
-        image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
-                (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X)*width)/old_width);
-    if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
-        image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
-                (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y)*height)/old_height);
-
     return image;
 }
 
+wxImage wxImage::ResampleBox(int width, int height) const
+{
+    // This function implements a simple pre-blur/box averaging method for
+    // downsampling that gives reasonably smooth results To scale the image
+    // down we will need to gather a grid of pixels of the size of the scale
+    // factor in each direction and then do an averaging of the pixels.
+
+    wxImage ret_image(width, height, false);
+
+    const double scale_factor_x = double(M_IMGDATA->m_width) / width;
+    const double scale_factor_y = double(M_IMGDATA->m_height) / height;
+
+    const int scale_factor_x_2 = (int)(scale_factor_x / 2);
+    const int scale_factor_y_2 = (int)(scale_factor_y / 2);
+
+    unsigned char* src_data = M_IMGDATA->m_data;
+    unsigned char* src_alpha = M_IMGDATA->m_alpha;
+    unsigned char* dst_data = ret_image.GetData();
+    unsigned char* dst_alpha = NULL;
+
+    if ( src_alpha )
+    {
+        ret_image.SetAlpha();
+        dst_alpha = ret_image.GetAlpha();
+    }
+
+    int averaged_pixels, src_pixel_index;
+    double sum_r, sum_g, sum_b, sum_a;
+
+    for ( int y = 0; y < height; y++ )         // Destination image - Y direction
+    {
+        // Source pixel in the Y direction
+        int src_y = (int)(y * scale_factor_y);
+
+        for ( int x = 0; x < width; x++ )      // Destination image - X direction
+        {
+            // Source pixel in the X direction
+            int src_x = (int)(x * scale_factor_x);
+
+            // Box of pixels to average
+            averaged_pixels = 0;
+            sum_r = sum_g = sum_b = sum_a = 0.0;
+
+            for ( int j = int(src_y - scale_factor_y/2.0 + 1);
+                  j <= int(src_y + scale_factor_y_2);
+                  j++ )
+            {
+                // We don't care to average pixels that don't exist (edges)
+                if ( j < 0 || j > M_IMGDATA->m_height - 1 )
+                    continue;
+
+                for ( int i = int(src_x - scale_factor_x/2.0 + 1);
+                      i <= src_x + scale_factor_x_2;
+                      i++ )
+                {
+                    // Don't average edge pixels
+                    if ( i < 0 || i > M_IMGDATA->m_width - 1 )
+                        continue;
+
+                    // Calculate the actual index in our source pixels
+                    src_pixel_index = j * M_IMGDATA->m_width + i;
+
+                    sum_r += src_data[src_pixel_index * 3 + 0];
+                    sum_g += src_data[src_pixel_index * 3 + 1];
+                    sum_b += src_data[src_pixel_index * 3 + 2];
+                    if ( src_alpha )
+                        sum_a += src_alpha[src_pixel_index];
+
+                    averaged_pixels++;
+                }
+            }
+
+            // Calculate the average from the sum and number of averaged pixels
+            dst_data[0] = (unsigned char)(sum_r / averaged_pixels);
+            dst_data[1] = (unsigned char)(sum_g / averaged_pixels);
+            dst_data[2] = (unsigned char)(sum_b / averaged_pixels);
+            dst_data += 3;
+            if ( src_alpha )
+                *dst_alpha++ = (unsigned char)(sum_a / averaged_pixels);
+        }
+    }
+
+    return ret_image;
+}
+
+wxImage wxImage::ResampleBilinear(int width, int height) const
+{
+    // This function implements a Bilinear algorithm for resampling.
+    wxImage ret_image(width, height, false);
+    unsigned char* src_data = M_IMGDATA->m_data;
+    unsigned char* src_alpha = M_IMGDATA->m_alpha;
+    unsigned char* dst_data = ret_image.GetData();
+    unsigned char* dst_alpha = NULL;
+
+    if ( src_alpha )
+    {
+        ret_image.SetAlpha();
+        dst_alpha = ret_image.GetAlpha();
+    }
+    double HFactor = double(M_IMGDATA->m_height) / height;
+    double WFactor = double(M_IMGDATA->m_width) / width;
+
+    int srcpixymax = M_IMGDATA->m_height - 1;
+    int srcpixxmax = M_IMGDATA->m_width - 1;
+
+    double srcpixy, srcpixy1, srcpixy2, dy, dy1;
+    double srcpixx, srcpixx1, srcpixx2, dx, dx1;
+
+    // initialize alpha values to avoid g++ warnings about possibly
+    // uninitialized variables
+    double r1, g1, b1, a1 = 0;
+    double r2, g2, b2, a2 = 0;
+
+    for ( int dsty = 0; dsty < height; dsty++ )
+    {
+        // We need to calculate the source pixel to interpolate from - Y-axis
+        srcpixy = double(dsty) * HFactor;
+        srcpixy1 = int(srcpixy);
+        srcpixy2 = ( srcpixy1 == srcpixymax ) ? srcpixy1 : srcpixy1 + 1.0;
+        dy = srcpixy - (int)srcpixy;
+        dy1 = 1.0 - dy;
+
+
+        for ( int dstx = 0; dstx < width; dstx++ )
+        {
+            // X-axis of pixel to interpolate from
+            srcpixx = double(dstx) * WFactor;
+            srcpixx1 = int(srcpixx);
+            srcpixx2 = ( srcpixx1 == srcpixxmax ) ? srcpixx1 : srcpixx1 + 1.0;
+            dx = srcpixx - (int)srcpixx;
+            dx1 = 1.0 - dx;
+
+            int x_offset1 = srcpixx1 < 0.0 ? 0 : srcpixx1 > srcpixxmax ? srcpixxmax : (int)srcpixx1;
+            int x_offset2 = srcpixx2 < 0.0 ? 0 : srcpixx2 > srcpixxmax ? srcpixxmax : (int)srcpixx2;
+            int y_offset1 = srcpixy1 < 0.0 ? 0 : srcpixy1 > srcpixymax ? srcpixymax : (int)srcpixy1;
+            int y_offset2 = srcpixy2 < 0.0 ? 0 : srcpixy2 > srcpixymax ? srcpixymax : (int)srcpixy2;
+
+            int src_pixel_index00 = y_offset1 * M_IMGDATA->m_width + x_offset1;
+            int src_pixel_index01 = y_offset1 * M_IMGDATA->m_width + x_offset2;
+            int src_pixel_index10 = y_offset2 * M_IMGDATA->m_width + x_offset1;
+            int src_pixel_index11 = y_offset2 * M_IMGDATA->m_width + x_offset2;
+
+            //first line
+            r1 = src_data[src_pixel_index00 * 3 + 0] * dx1 + src_data[src_pixel_index01 * 3 + 0] * dx;
+            g1 = src_data[src_pixel_index00 * 3 + 1] * dx1 + src_data[src_pixel_index01 * 3 + 1] * dx;
+            b1 = src_data[src_pixel_index00 * 3 + 2] * dx1 + src_data[src_pixel_index01 * 3 + 2] * dx;
+            if ( src_alpha )
+                a1 = src_alpha[src_pixel_index00] * dx1 + src_alpha[src_pixel_index01] * dx;
+
+            //second line
+            r2 = src_data[src_pixel_index10 * 3 + 0] * dx1 + src_data[src_pixel_index11 * 3 + 0] * dx;
+            g2 = src_data[src_pixel_index10 * 3 + 1] * dx1 + src_data[src_pixel_index11 * 3 + 1] * dx;
+            b2 = src_data[src_pixel_index10 * 3 + 2] * dx1 + src_data[src_pixel_index11 * 3 + 2] * dx;
+            if ( src_alpha )
+                a2 = src_alpha[src_pixel_index10] * dx1 + src_alpha[src_pixel_index11] * dx;
+
+            //result lines
+
+            dst_data[0] = static_cast<unsigned char>(r1 * dy1 + r2 * dy);
+            dst_data[1] = static_cast<unsigned char>(g1 * dy1 + g2 * dy);
+            dst_data[2] = static_cast<unsigned char>(b1 * dy1 + b2 * dy);
+            dst_data += 3;
+
+            if ( src_alpha )
+                *dst_alpha++ = static_cast<unsigned char>(a1 * dy1 + a2 * dy);
+        }
+    }
+
+    return ret_image;
+}
+
+// The following two local functions are for the B-spline weighting of the
+// bicubic sampling algorithm
+static inline double spline_cube(double value)
+{
+    return value <= 0.0 ? 0.0 : value * value * value;
+}
+
+static inline double spline_weight(double value)
+{
+    return (spline_cube(value + 2) -
+            4 * spline_cube(value + 1) +
+            6 * spline_cube(value) -
+            4 * spline_cube(value - 1)) / 6;
+}
+
+// This is the bicubic resampling algorithm
+wxImage wxImage::ResampleBicubic(int width, int height) const
+{
+    // This function implements a Bicubic B-Spline algorithm for resampling.
+    // This method is certainly a little slower than wxImage's default pixel
+    // replication method, however for most reasonably sized images not being
+    // upsampled too much on a fairly average CPU this difference is hardly
+    // noticeable and the results are far more pleasing to look at.
+    //
+    // This particular bicubic algorithm does pixel weighting according to a
+    // B-Spline that basically implements a Gaussian bell-like weighting
+    // kernel. Because of this method the results may appear a bit blurry when
+    // upsampling by large factors.  This is basically because a slight
+    // gaussian blur is being performed to get the smooth look of the upsampled
+    // image.
+
+    // Edge pixels: 3-4 possible solutions
+    // - (Wrap/tile) Wrap the image, take the color value from the opposite
+    // side of the image.
+    // - (Mirror)    Duplicate edge pixels, so that pixel at coordinate (2, n),
+    // where n is nonpositive, will have the value of (2, 1).
+    // - (Ignore)    Simply ignore the edge pixels and apply the kernel only to
+    // pixels which do have all neighbours.
+    // - (Clamp)     Choose the nearest pixel along the border. This takes the
+    // border pixels and extends them out to infinity.
+    //
+    // NOTE: below the y_offset and x_offset variables are being set for edge
+    // pixels using the "Mirror" method mentioned above
+
+    wxImage ret_image;
+
+    ret_image.Create(width, height, false);
+
+    unsigned char* src_data = M_IMGDATA->m_data;
+    unsigned char* src_alpha = M_IMGDATA->m_alpha;
+    unsigned char* dst_data = ret_image.GetData();
+    unsigned char* dst_alpha = NULL;
+
+    if ( src_alpha )
+    {
+        ret_image.SetAlpha();
+        dst_alpha = ret_image.GetAlpha();
+    }
+
+    for ( int dsty = 0; dsty < height; dsty++ )
+    {
+        // We need to calculate the source pixel to interpolate from - Y-axis
+        double srcpixy = double(dsty * M_IMGDATA->m_height) / height;
+        double dy = srcpixy - (int)srcpixy;
+
+        for ( int dstx = 0; dstx < width; dstx++ )
+        {
+            // X-axis of pixel to interpolate from
+            double srcpixx = double(dstx * M_IMGDATA->m_width) / width;
+            double dx = srcpixx - (int)srcpixx;
+
+            // Sums for each color channel
+            double sum_r = 0, sum_g = 0, sum_b = 0, sum_a = 0;
+
+            // Here we actually determine the RGBA values for the destination pixel
+            for ( int k = -1; k <= 2; k++ )
+            {
+                // Y offset
+                int y_offset = srcpixy + k < 0.0
+                                ? 0
+                                : srcpixy + k >= M_IMGDATA->m_height
+                                       ? M_IMGDATA->m_height - 1
+                                       : (int)(srcpixy + k);
+
+                // Loop across the X axis
+                for ( int i = -1; i <= 2; i++ )
+                {
+                    // X offset
+                    int x_offset = srcpixx + i < 0.0
+                                    ? 0
+                                    : srcpixx + i >= M_IMGDATA->m_width
+                                            ? M_IMGDATA->m_width - 1
+                                            : (int)(srcpixx + i);
+
+                    // Calculate the exact position where the source data
+                    // should be pulled from based on the x_offset and y_offset
+                    int src_pixel_index = y_offset*M_IMGDATA->m_width + x_offset;
+
+                    // Calculate the weight for the specified pixel according
+                    // to the bicubic b-spline kernel we're using for
+                    // interpolation
+                    double
+                        pixel_weight = spline_weight(i - dx)*spline_weight(k - dy);
+
+                    // Create a sum of all velues for each color channel
+                    // adjusted for the pixel's calculated weight
+                    sum_r += src_data[src_pixel_index * 3 + 0] * pixel_weight;
+                    sum_g += src_data[src_pixel_index * 3 + 1] * pixel_weight;
+                    sum_b += src_data[src_pixel_index * 3 + 2] * pixel_weight;
+                    if ( src_alpha )
+                        sum_a += src_alpha[src_pixel_index] * pixel_weight;
+                }
+            }
+
+            // Put the data into the destination image.  The summed values are
+            // of double data type and are rounded here for accuracy
+            dst_data[0] = (unsigned char)(sum_r + 0.5);
+            dst_data[1] = (unsigned char)(sum_g + 0.5);
+            dst_data[2] = (unsigned char)(sum_b + 0.5);
+            dst_data += 3;
+
+            if ( src_alpha )
+                *dst_alpha++ = (unsigned char)sum_a;
+        }
+    }
+
+    return ret_image;
+}
+
+// Blur in the horizontal direction
+wxImage wxImage::BlurHorizontal(int blurRadius) const
+{
+    wxImage ret_image;
+    ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
+
+    unsigned char* src_data = M_IMGDATA->m_data;
+    unsigned char* dst_data = ret_image.GetData();
+    unsigned char* src_alpha = M_IMGDATA->m_alpha;
+    unsigned char* dst_alpha = NULL;
+
+    // Check for a mask or alpha
+    if ( src_alpha )
+    {
+        ret_image.SetAlpha();
+        dst_alpha = ret_image.GetAlpha();
+    }
+    else if ( M_IMGDATA->m_hasMask )
+    {
+        ret_image.SetMaskColour(M_IMGDATA->m_maskRed,
+                                M_IMGDATA->m_maskGreen,
+                                M_IMGDATA->m_maskBlue);
+    }
+
+    // number of pixels we average over
+    const int blurArea = blurRadius*2 + 1;
+
+    // Horizontal blurring algorithm - average all pixels in the specified blur
+    // radius in the X or horizontal direction
+    for ( int y = 0; y < M_IMGDATA->m_height; y++ )
+    {
+        // Variables used in the blurring algorithm
+        long sum_r = 0,
+             sum_g = 0,
+             sum_b = 0,
+             sum_a = 0;
+
+        long pixel_idx;
+        const unsigned char *src;
+        unsigned char *dst;
+
+        // Calculate the average of all pixels in the blur radius for the first
+        // pixel of the row
+        for ( int kernel_x = -blurRadius; kernel_x <= blurRadius; kernel_x++ )
+        {
+            // To deal with the pixels at the start of a row so it's not
+            // grabbing GOK values from memory at negative indices of the
+            // image's data or grabbing from the previous row
+            if ( kernel_x < 0 )
+                pixel_idx = y * M_IMGDATA->m_width;
+            else
+                pixel_idx = kernel_x + y * M_IMGDATA->m_width;
+
+            src = src_data + pixel_idx*3;
+            sum_r += src[0];
+            sum_g += src[1];
+            sum_b += src[2];
+            if ( src_alpha )
+                sum_a += src_alpha[pixel_idx];
+        }
+
+        dst = dst_data + y * M_IMGDATA->m_width*3;
+        dst[0] = (unsigned char)(sum_r / blurArea);
+        dst[1] = (unsigned char)(sum_g / blurArea);
+        dst[2] = (unsigned char)(sum_b / blurArea);
+        if ( src_alpha )
+            dst_alpha[y * M_IMGDATA->m_width] = (unsigned char)(sum_a / blurArea);
+
+        // Now average the values of the rest of the pixels by just moving the
+        // blur radius box along the row
+        for ( int x = 1; x < M_IMGDATA->m_width; x++ )
+        {
+            // Take care of edge pixels on the left edge by essentially
+            // duplicating the edge pixel
+            if ( x - blurRadius - 1 < 0 )
+                pixel_idx = y * M_IMGDATA->m_width;
+            else
+                pixel_idx = (x - blurRadius - 1) + y * M_IMGDATA->m_width;
+
+            // Subtract the value of the pixel at the left side of the blur
+            // radius box
+            src = src_data + pixel_idx*3;
+            sum_r -= src[0];
+            sum_g -= src[1];
+            sum_b -= src[2];
+            if ( src_alpha )
+                sum_a -= src_alpha[pixel_idx];
+
+            // Take care of edge pixels on the right edge
+            if ( x + blurRadius > M_IMGDATA->m_width - 1 )
+                pixel_idx = M_IMGDATA->m_width - 1 + y * M_IMGDATA->m_width;
+            else
+                pixel_idx = x + blurRadius + y * M_IMGDATA->m_width;
+
+            // Add the value of the pixel being added to the end of our box
+            src = src_data + pixel_idx*3;
+            sum_r += src[0];
+            sum_g += src[1];
+            sum_b += src[2];
+            if ( src_alpha )
+                sum_a += src_alpha[pixel_idx];
+
+            // Save off the averaged data
+            dst = dst_data + x*3 + y*M_IMGDATA->m_width*3;
+            dst[0] = (unsigned char)(sum_r / blurArea);
+            dst[1] = (unsigned char)(sum_g / blurArea);
+            dst[2] = (unsigned char)(sum_b / blurArea);
+            if ( src_alpha )
+                dst_alpha[x + y * M_IMGDATA->m_width] = (unsigned char)(sum_a / blurArea);
+        }
+    }
+
+    return ret_image;
+}
+
+// Blur in the vertical direction
+wxImage wxImage::BlurVertical(int blurRadius) const
+{
+    wxImage ret_image;
+    ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
+
+    unsigned char* src_data = M_IMGDATA->m_data;
+    unsigned char* dst_data = ret_image.GetData();
+    unsigned char* src_alpha = M_IMGDATA->m_alpha;
+    unsigned char* dst_alpha = NULL;
+
+    // Check for a mask or alpha
+    if ( src_alpha )
+    {
+        ret_image.SetAlpha();
+        dst_alpha = ret_image.GetAlpha();
+    }
+    else if ( M_IMGDATA->m_hasMask )
+    {
+        ret_image.SetMaskColour(M_IMGDATA->m_maskRed,
+                                M_IMGDATA->m_maskGreen,
+                                M_IMGDATA->m_maskBlue);
+    }
+
+    // number of pixels we average over
+    const int blurArea = blurRadius*2 + 1;
+
+    // Vertical blurring algorithm - same as horizontal but switched the
+    // opposite direction
+    for ( int x = 0; x < M_IMGDATA->m_width; x++ )
+    {
+        // Variables used in the blurring algorithm
+        long sum_r = 0,
+             sum_g = 0,
+             sum_b = 0,
+             sum_a = 0;
+
+        long pixel_idx;
+        const unsigned char *src;
+        unsigned char *dst;
+
+        // Calculate the average of all pixels in our blur radius box for the
+        // first pixel of the column
+        for ( int kernel_y = -blurRadius; kernel_y <= blurRadius; kernel_y++ )
+        {
+            // To deal with the pixels at the start of a column so it's not
+            // grabbing GOK values from memory at negative indices of the
+            // image's data or grabbing from the previous column
+            if ( kernel_y < 0 )
+                pixel_idx = x;
+            else
+                pixel_idx = x + kernel_y * M_IMGDATA->m_width;
+
+            src = src_data + pixel_idx*3;
+            sum_r += src[0];
+            sum_g += src[1];
+            sum_b += src[2];
+            if ( src_alpha )
+                sum_a += src_alpha[pixel_idx];
+        }
+
+        dst = dst_data + x*3;
+        dst[0] = (unsigned char)(sum_r / blurArea);
+        dst[1] = (unsigned char)(sum_g / blurArea);
+        dst[2] = (unsigned char)(sum_b / blurArea);
+        if ( src_alpha )
+            dst_alpha[x] = (unsigned char)(sum_a / blurArea);
+
+        // Now average the values of the rest of the pixels by just moving the
+        // box along the column from top to bottom
+        for ( int y = 1; y < M_IMGDATA->m_height; y++ )
+        {
+            // Take care of pixels that would be beyond the top edge by
+            // duplicating the top edge pixel for the column
+            if ( y - blurRadius - 1 < 0 )
+                pixel_idx = x;
+            else
+                pixel_idx = x + (y - blurRadius - 1) * M_IMGDATA->m_width;
+
+            // Subtract the value of the pixel at the top of our blur radius box
+            src = src_data + pixel_idx*3;
+            sum_r -= src[0];
+            sum_g -= src[1];
+            sum_b -= src[2];
+            if ( src_alpha )
+                sum_a -= src_alpha[pixel_idx];
+
+            // Take care of the pixels that would be beyond the bottom edge of
+            // the image similar to the top edge
+            if ( y + blurRadius > M_IMGDATA->m_height - 1 )
+                pixel_idx = x + (M_IMGDATA->m_height - 1) * M_IMGDATA->m_width;
+            else
+                pixel_idx = x + (blurRadius + y) * M_IMGDATA->m_width;
+
+            // Add the value of the pixel being added to the end of our box
+            src = src_data + pixel_idx*3;
+            sum_r += src[0];
+            sum_g += src[1];
+            sum_b += src[2];
+            if ( src_alpha )
+                sum_a += src_alpha[pixel_idx];
+
+            // Save off the averaged data
+            dst = dst_data + (x + y * M_IMGDATA->m_width) * 3;
+            dst[0] = (unsigned char)(sum_r / blurArea);
+            dst[1] = (unsigned char)(sum_g / blurArea);
+            dst[2] = (unsigned char)(sum_b / blurArea);
+            if ( src_alpha )
+                dst_alpha[x + y * M_IMGDATA->m_width] = (unsigned char)(sum_a / blurArea);
+        }
+    }
+
+    return ret_image;
+}
+
+// The new blur function
+wxImage wxImage::Blur(int blurRadius) const
+{
+    wxImage ret_image;
+    ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
+
+    // Blur the image in each direction
+    ret_image = BlurHorizontal(blurRadius);
+    ret_image = ret_image.BlurVertical(blurRadius);
+
+    return ret_image;
+}
+
 wxImage wxImage::Rotate90( bool clockwise ) const
 {
     wxImage image;
@@ -706,21 +1283,30 @@ wxImage wxImage::Size( const wxSize& size, const wxPoint& pos,
 
     image.SetRGB(wxRect(), r, g, b);
 
-    wxRect subRect(pos.x, pos.y, width, height);
-    wxRect finalRect(0, 0, size.GetWidth(), size.GetHeight());
-    if (pos.x < 0)
-        finalRect.width -= pos.x;
-    if (pos.y < 0)
-        finalRect.height -= pos.y;
+    // we have two coordinate systems:
+    // source:     starting at 0,0 of source image
+    // destination starting at 0,0 of destination image
+    // Documentation says:
+    // "The image is pasted into a new image [...] at the position pos relative
+    // to the upper left of the new image." this means the transition rule is:
+    // "dest coord" = "source coord" + pos;
+
+    // calculate the intersection using source coordinates:
+    wxRect srcRect(0, 0, width, height);
+    wxRect dstRect(-pos, size);
 
-    subRect.Intersect(finalRect);
+    srcRect.Intersect(dstRect);
 
-    if (!subRect.IsEmpty())
+    if (!srcRect.IsEmpty())
     {
-        if ((subRect.GetWidth() == width) && (subRect.GetHeight() == height))
-            image.Paste(*this, pos.x, pos.y);
+        // insertion point is needed in destination coordinates.
+        // NB: it is not always "pos"!
+        wxPoint ptInsert = srcRect.GetTopLeft() + pos;
+
+        if ((srcRect.GetWidth() == width) && (srcRect.GetHeight() == height))
+            image.Paste(*this, ptInsert.x, ptInsert.y);
         else
-            image.Paste(GetSubImage(subRect), pos.x, pos.y);
+            image.Paste(GetSubImage(srcRect), ptInsert.x, ptInsert.y);
     }
 
     return image;
@@ -731,6 +1317,8 @@ void wxImage::Paste( const wxImage &image, int x, int y )
     wxCHECK_RET( Ok(), wxT("invalid image") );
     wxCHECK_RET( image.Ok(), wxT("invalid image") );
 
+    AllocExclusive();
+
     int xx = 0;
     int yy = 0;
     int width = image.GetWidth();
@@ -762,7 +1350,6 @@ void wxImage::Paste( const wxImage &image, int x, int y )
          (GetMaskGreen()==image.GetMaskGreen()) &&
          (GetMaskBlue()==image.GetMaskBlue()))))
     {
-        width *= 3;
         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
         int source_step = image.GetWidth()*3;
 
@@ -770,11 +1357,30 @@ void wxImage::Paste( const wxImage &image, int x, int y )
         int target_step = M_IMGDATA->m_width*3;
         for (int j = 0; j < height; j++)
         {
-            memcpy( target_data, source_data, width );
+            memcpy( target_data, source_data, width*3 );
             source_data += source_step;
             target_data += target_step;
         }
-        return;
+    }
+
+    // Copy over the alpha channel from the original image
+    if ( image.HasAlpha() )
+    {
+        if ( !HasAlpha() )
+            InitAlpha();
+
+        unsigned char* source_data = image.GetAlpha() + xx + yy*image.GetWidth();
+        int source_step = image.GetWidth();
+
+        unsigned char* target_data = GetAlpha() + (x+xx) + (y+yy)*M_IMGDATA->m_width;
+        int target_step = M_IMGDATA->m_width;
+
+        for (int j = 0; j < height; j++,
+                                    source_data += source_step,
+                                    target_data += target_step)
+        {
+            memcpy( target_data, source_data, width );
+        }
     }
 
     if (!HasMask() && image.HasMask())
@@ -783,7 +1389,6 @@ void wxImage::Paste( const wxImage &image, int x, int y )
         unsigned char g = image.GetMaskGreen();
         unsigned char b = image.GetMaskBlue();
 
-        width *= 3;
         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
         int source_step = image.GetWidth()*3;
 
@@ -792,10 +1397,10 @@ void wxImage::Paste( const wxImage &image, int x, int y )
 
         for (int j = 0; j < height; j++)
         {
-            for (int i = 0; i < width; i+=3)
+            for (int i = 0; i < width*3; i+=3)
             {
-                if ((source_data[i]   != r) &&
-                    (source_data[i+1] != g) &&
+                if ((source_data[i]   != r) ||
+                    (source_data[i+1] != g) ||
                     (source_data[i+2] != b))
                 {
                     memcpy( target_data+i, source_data+i, 3 );
@@ -812,6 +1417,8 @@ void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 {
     wxCHECK_RET( Ok(), wxT("invalid image") );
 
+    AllocExclusive();
+
     unsigned char *data = GetData();
 
     const int w = GetWidth();
@@ -830,7 +1437,12 @@ void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
         }
 }
 
-wxImage wxImage::ConvertToGreyscale( double lr, double lg, double lb ) const
+wxImage wxImage::ConvertToGreyscale(void) const
+{
+    return ConvertToGreyscale(0.299, 0.587, 0.114);
+}
+
+wxImage wxImage::ConvertToGreyscale(double weight_r, double weight_g, double weight_b) const
 {
     wxImage image;
 
@@ -854,19 +1466,27 @@ wxImage wxImage::ConvertToGreyscale( double lr, double lg, double lb ) const
     const long size = M_IMGDATA->m_width * M_IMGDATA->m_height;
     for ( long i = 0; i < size; i++, src += 3, dest += 3 )
     {
+        memcpy(dest, src, 3);
         // don't modify the mask
         if ( hasMask && src[0] == maskRed && src[1] == maskGreen && src[2] == maskBlue )
         {
-            memcpy(dest, src, 3);
         }
         else
         {
-            // calculate the luma
-            double luma = (src[0] * lr + src[1] * lg + src[2] * lb) + 0.5;
-            dest[0] = dest[1] = dest[2] = wx_static_cast(unsigned char, luma);
+            wxColour::MakeGrey(dest + 0, dest + 1, dest + 2, weight_r, weight_g, weight_b);
         }
     }
 
+    // copy the alpha channel, if any
+    if (HasAlpha())
+    {
+        const size_t alphaSize = GetWidth() * GetHeight();
+        unsigned char *alpha = (unsigned char*)malloc(alphaSize);
+        memcpy(alpha, GetAlpha(), alphaSize);
+        image.InitAlpha();
+        image.SetAlpha(alpha);
+    }
+
     return image;
 }
 
@@ -898,15 +1518,43 @@ wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char
 
     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
     {
-        if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
-            tard[0] = tard[1] = tard[2] = 255;
-        else
-            tard[0] = tard[1] = tard[2] = 0;
+        bool on = (srcd[0] == r) && (srcd[1] == g) && (srcd[2] == b);
+        wxColourBase::MakeMono(tard + 0, tard + 1, tard + 2, on);
     }
 
     return image;
 }
 
+wxImage wxImage::ConvertToDisabled(unsigned char brightness) const
+{
+    wxImage image = *this;
+
+    unsigned char mr = image.GetMaskRed();
+    unsigned char mg = image.GetMaskGreen();
+    unsigned char mb = image.GetMaskBlue();
+
+    int width = image.GetWidth();
+    int height = image.GetHeight();
+    bool has_mask = image.HasMask();
+
+    for (int y = height-1; y >= 0; --y)
+    {
+        for (int x = width-1; x >= 0; --x)
+        {
+            unsigned char* data = image.GetData() + (y*(width*3))+(x*3);
+            unsigned char* r = data;
+            unsigned char* g = data+1;
+            unsigned char* b = data+2;
+
+            if (has_mask && (*r == mr) && (*g == mg) && (*b == mb))
+                continue;
+
+            wxColour::MakeDisabled(r, g, b, brightness);
+        }
+    }
+    return image;
+}
+
 int wxImage::GetWidth() const
 {
     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
@@ -921,6 +1569,23 @@ int wxImage::GetHeight() const
     return M_IMGDATA->m_height;
 }
 
+wxBitmapType wxImage::GetType() const
+{
+    wxCHECK_MSG( IsOk(), wxBITMAP_TYPE_INVALID, wxT("invalid image") );
+
+    return M_IMGDATA->m_type;
+}
+
+void wxImage::SetType(wxBitmapType type)
+{
+    wxCHECK_RET( IsOk(), "must create the image before setting its type");
+
+    // type can be wxBITMAP_TYPE_INVALID to reset the image type to default
+    wxASSERT_MSG( type != wxBITMAP_TYPE_MAX, "invalid bitmap type" );
+
+    M_IMGDATA->m_type = type;
+}
+
 long wxImage::XYToIndex(int x, int y) const
 {
     if ( Ok() &&
@@ -938,6 +1603,8 @@ void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned c
     long pos = XYToIndex(x, y);
     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
 
+    AllocExclusive();
+
     pos *= 3;
 
     M_IMGDATA->m_data[ pos   ] = r;
@@ -949,6 +1616,8 @@ void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, uns
 {
     wxCHECK_RET( Ok(), wxT("invalid image") );
 
+    AllocExclusive();
+
     wxRect rect(rect_);
     wxRect imageRect(0, 0, GetWidth(), GetHeight());
     if ( rect == wxRect() )
@@ -957,8 +1626,8 @@ void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, uns
     }
     else
     {
-        wxCHECK_RET( imageRect.Inside(rect.GetTopLeft()) &&
-                     imageRect.Inside(rect.GetBottomRight()),
+        wxCHECK_RET( imageRect.Contains(rect.GetTopLeft()) &&
+                     imageRect.Contains(rect.GetBottomRight()),
                      wxT("invalid bounding rectangle") );
     }
 
@@ -1011,7 +1680,7 @@ unsigned char wxImage::GetBlue( int x, int y ) const
     return M_IMGDATA->m_data[pos+2];
 }
 
-bool wxImage::Ok() const
+bool wxImage::IsOk() const
 {
     // image of 0 width or height can't be considered ok - at least because it
     // causes crashes in ConvertToBitmap() if we don't catch it in time
@@ -1087,6 +1756,8 @@ void wxImage::SetAlpha(int x, int y, unsigned char alpha)
     long pos = XYToIndex(x, y);
     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
 
+    AllocExclusive();
+
     M_IMGDATA->m_alpha[pos] = alpha;
 }
 
@@ -1129,12 +1800,16 @@ void wxImage::SetAlpha( unsigned char *alpha, bool static_data )
 {
     wxCHECK_RET( Ok(), wxT("invalid image") );
 
+    AllocExclusive();
+
     if ( !alpha )
     {
         alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
     }
 
-    free(M_IMGDATA->m_alpha);
+    if( !M_IMGDATA->m_staticAlpha )
+        free(M_IMGDATA->m_alpha);
+
     M_IMGDATA->m_alpha = alpha;
     M_IMGDATA->m_staticAlpha = static_data;
 }
@@ -1182,6 +1857,17 @@ void wxImage::InitAlpha()
     }
 }
 
+void wxImage::ClearAlpha()
+{
+    wxCHECK_RET( HasAlpha(), wxT("image already doesn't have an alpha channel") );
+
+    if ( !M_IMGDATA->m_staticAlpha )
+        free( M_IMGDATA->m_alpha );
+
+    M_IMGDATA->m_alpha = NULL;
+}
+
+
 // ----------------------------------------------------------------------------
 // mask support
 // ----------------------------------------------------------------------------
@@ -1190,6 +1876,8 @@ void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
 {
     wxCHECK_RET( Ok(), wxT("invalid image") );
 
+    AllocExclusive();
+
     M_IMGDATA->m_maskRed = r;
     M_IMGDATA->m_maskGreen = g;
     M_IMGDATA->m_maskBlue = b;
@@ -1239,6 +1927,8 @@ void wxImage::SetMask( bool mask )
 {
     wxCHECK_RET( Ok(), wxT("invalid image") );
 
+    AllocExclusive();
+
     M_IMGDATA->m_hasMask = mask;
 }
 
@@ -1298,6 +1988,8 @@ bool wxImage::SetMaskFromImage(const wxImage& mask,
         return false ;
     }
 
+    AllocExclusive();
+
     unsigned char *imgdata = GetData();
     unsigned char *maskdata = mask.GetData();
 
@@ -1327,16 +2019,30 @@ bool wxImage::SetMaskFromImage(const wxImage& mask,
 
 bool wxImage::ConvertAlphaToMask(unsigned char threshold)
 {
-    if (!HasAlpha())
+    if ( !HasAlpha() )
         return true;
 
     unsigned char mr, mg, mb;
-    if (!FindFirstUnusedColour(&mr, &mg, &mb))
+    if ( !FindFirstUnusedColour(&mr, &mg, &mb) )
     {
         wxLogError( _("No unused colour in image being masked.") );
         return false;
     }
 
+    ConvertAlphaToMask(mr, mg, mb, threshold);
+    return true;
+}
+
+void wxImage::ConvertAlphaToMask(unsigned char mr,
+                                 unsigned char mg,
+                                 unsigned char mb,
+                                 unsigned char threshold)
+{
+    if ( !HasAlpha() )
+        return;
+
+    AllocExclusive();
+
     SetMask(true);
     SetMaskColour(mr, mg, mb);
 
@@ -1359,10 +2065,11 @@ bool wxImage::ConvertAlphaToMask(unsigned char threshold)
         }
     }
 
-    free(M_IMGDATA->m_alpha);
-    M_IMGDATA->m_alpha = NULL;
+    if ( !M_IMGDATA->m_staticAlpha )
+        free(M_IMGDATA->m_alpha);
 
-    return true;
+    M_IMGDATA->m_alpha = NULL;
+    M_IMGDATA->m_staticAlpha = false;
 }
 
 // ----------------------------------------------------------------------------
@@ -1390,6 +2097,8 @@ void wxImage::SetPalette(const wxPalette& palette)
 {
     wxCHECK_RET( Ok(), wxT("invalid image") );
 
+    AllocExclusive();
+
     M_IMGDATA->m_palette = palette;
 }
 
@@ -1401,10 +2110,10 @@ void wxImage::SetPalette(const wxPalette& palette)
 
 void wxImage::SetOption(const wxString& name, const wxString& value)
 {
-    wxCHECK_RET( Ok(), wxT("invalid image") );
+    AllocExclusive();
 
     int idx = M_IMGDATA->m_optionNames.Index(name, false);
-    if (idx == wxNOT_FOUND)
+    if ( idx == wxNOT_FOUND )
     {
         M_IMGDATA->m_optionNames.Add(name);
         M_IMGDATA->m_optionValues.Add(value);
@@ -1425,10 +2134,11 @@ void wxImage::SetOption(const wxString& name, int value)
 
 wxString wxImage::GetOption(const wxString& name) const
 {
-    wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
+    if ( !M_IMGDATA )
+        return wxEmptyString;
 
     int idx = M_IMGDATA->m_optionNames.Index(name, false);
-    if (idx == wxNOT_FOUND)
+    if ( idx == wxNOT_FOUND )
         return wxEmptyString;
     else
         return M_IMGDATA->m_optionValues[idx];
@@ -1441,21 +2151,22 @@ int wxImage::GetOptionInt(const wxString& name) const
 
 bool wxImage::HasOption(const wxString& name) const
 {
-    wxCHECK_MSG( Ok(), false, wxT("invalid image") );
-
-    return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
+    return M_IMGDATA ? M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND
+                     : false;
 }
 
 // ----------------------------------------------------------------------------
 // image I/O
 // ----------------------------------------------------------------------------
 
-bool wxImage::LoadFile( const wxString& filename, long type, int index )
+bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
+                        wxBitmapType WXUNUSED_UNLESS_STREAMS(type),
+                        int WXUNUSED_UNLESS_STREAMS(index) )
 {
-#if wxUSE_STREAMS
+#if HAS_FILE_STREAMS
     if (wxFileExists(filename))
     {
-        wxFileInputStream stream(filename);
+        wxImageFileInputStream stream(filename);
         wxBufferedInputStream bstream( stream );
         return LoadFile(bstream, type, index);
     }
@@ -1465,17 +2176,19 @@ bool wxImage::LoadFile( const wxString& filename, long type, int index )
 
         return false;
     }
-#else // !wxUSE_STREAMS
+#else // !HAS_FILE_STREAMS
     return false;
-#endif // wxUSE_STREAMS
+#endif // HAS_FILE_STREAMS
 }
 
-bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype, int index )
+bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
+                        const wxString& WXUNUSED_UNLESS_STREAMS(mimetype),
+                        int WXUNUSED_UNLESS_STREAMS(index) )
 {
-#if wxUSE_STREAMS
+#if HAS_FILE_STREAMS
     if (wxFileExists(filename))
     {
-        wxFileInputStream stream(filename);
+        wxImageFileInputStream stream(filename);
         wxBufferedInputStream bstream( stream );
         return LoadFile(bstream, mimetype, index);
     }
@@ -1485,83 +2198,84 @@ bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype, int
 
         return false;
     }
-#else // !wxUSE_STREAMS
+#else // !HAS_FILE_STREAMS
     return false;
-#endif // wxUSE_STREAMS
+#endif // HAS_FILE_STREAMS
 }
 
 
-
 bool wxImage::SaveFile( const wxString& filename ) const
 {
     wxString ext = filename.AfterLast('.').Lower();
 
-    wxImageHandler * pHandler = FindHandler(ext, -1);
-    if (pHandler)
+    wxImageHandler *handler = FindHandler(ext, wxBITMAP_TYPE_ANY);
+    if ( !handler)
     {
-        SaveFile(filename, pHandler->GetType());
-        return true;
+       wxLogError(_("Can't save image to file '%s': unknown extension."),
+                  filename);
+       return false;
     }
 
-    wxLogError(_("Can't save image to file '%s': unknown extension."), filename.c_str());
-
-    return false;
+    return SaveFile(filename, handler->GetType());
 }
 
-bool wxImage::SaveFile( const wxString& filename, int type ) const
+bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
+                        wxBitmapType WXUNUSED_UNLESS_STREAMS(type) ) const
 {
-#if wxUSE_STREAMS
+#if HAS_FILE_STREAMS
     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
 
     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
 
-    wxFileOutputStream stream(filename);
+    wxImageFileOutputStream stream(filename);
 
     if ( stream.IsOk() )
     {
         wxBufferedOutputStream bstream( stream );
         return SaveFile(bstream, type);
     }
-#endif // wxUSE_STREAMS
+#endif // HAS_FILE_STREAMS
 
     return false;
 }
 
-bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype ) const
+bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
+                        const wxString& WXUNUSED_UNLESS_STREAMS(mimetype) ) const
 {
-#if wxUSE_STREAMS
+#if HAS_FILE_STREAMS
     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
 
     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
 
-    wxFileOutputStream stream(filename);
+    wxImageFileOutputStream stream(filename);
 
     if ( stream.IsOk() )
     {
         wxBufferedOutputStream bstream( stream );
         return SaveFile(bstream, mimetype);
     }
-#endif // wxUSE_STREAMS
+#endif // HAS_FILE_STREAMS
 
     return false;
 }
 
-bool wxImage::CanRead( const wxString &name )
+bool wxImage::CanRead( const wxString& WXUNUSED_UNLESS_STREAMS(name) )
 {
-#if wxUSE_STREAMS
-  wxFileInputStream stream(name);
-  return CanRead(stream);
+#if HAS_FILE_STREAMS
+    wxImageFileInputStream stream(name);
+    return CanRead(stream);
 #else
-  return false;
+    return false;
 #endif
 }
 
-int wxImage::GetImageCount( const wxString &name, long type )
+int wxImage::GetImageCount( const wxString& WXUNUSED_UNLESS_STREAMS(name),
+                            wxBitmapType WXUNUSED_UNLESS_STREAMS(type) )
 {
-#if wxUSE_STREAMS
-  wxFileInputStream stream(name);
-  if (stream.Ok())
-      return GetImageCount(stream, type);
+#if HAS_FILE_STREAMS
+    wxImageFileInputStream stream(name);
+    if (stream.Ok())
+        return GetImageCount(stream, type);
 #endif
 
   return 0;
@@ -1583,19 +2297,25 @@ bool wxImage::CanRead( wxInputStream &stream )
     return false;
 }
 
-int wxImage::GetImageCount( wxInputStream &stream, long type )
+int wxImage::GetImageCount( wxInputStream &stream, wxBitmapType type )
 {
     wxImageHandler *handler;
 
     if ( type == wxBITMAP_TYPE_ANY )
     {
-        wxList &list=GetHandlers();
+        const wxList& list = GetHandlers();
 
-        for (wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext())
+        for ( wxList::compatibility_iterator node = list.GetFirst();
+              node;
+              node = node->GetNext() )
         {
-             handler=(wxImageHandler*)node->GetData();
+             handler = (wxImageHandler*)node->GetData();
              if ( handler->CanRead(stream) )
-                 return handler->GetImageCount(stream);
+             {
+                 const int count = handler->GetImageCount(stream);
+                 if ( count >= 0 )
+                     return count;
+             }
 
         }
 
@@ -1607,7 +2327,7 @@ int wxImage::GetImageCount( wxInputStream &stream, long type )
 
     if ( !handler )
     {
-        wxLogWarning(_("No image handler for type %d defined."), type);
+        wxLogWarning(_("No image handler for type %ld defined."), type);
         return false;
     }
 
@@ -1617,51 +2337,85 @@ int wxImage::GetImageCount( wxInputStream &stream, long type )
     }
     else
     {
-        wxLogError(_("Image file is not of type %d."), type);
+        wxLogError(_("Image file is not of type %ld."), type);
         return 0;
     }
 }
 
-bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
+bool wxImage::DoLoad(wxImageHandler& handler, wxInputStream& stream, int index)
 {
-    UnRef();
+    // save the options values which can be clobbered by the handler (e.g. many
+    // of them call Destroy() before trying to load the file)
+    const unsigned maxWidth = GetOptionInt(wxIMAGE_OPTION_MAX_WIDTH),
+                   maxHeight = GetOptionInt(wxIMAGE_OPTION_MAX_HEIGHT);
 
-    m_refData = new wxImageRefData;
+    if ( !handler.LoadFile(this, stream, true/*verbose*/, index) )
+        return false;
+
+    // rescale the image to the specified size if needed
+    if ( maxWidth || maxHeight )
+    {
+        const unsigned widthOrig = GetWidth(),
+                       heightOrig = GetHeight();
+
+        // this uses the same (trivial) algorithm as the JPEG handler
+        unsigned width = widthOrig,
+                 height = heightOrig;
+        while ( (maxWidth && width > maxWidth) ||
+                    (maxHeight && height > maxHeight) )
+        {
+            width /= 2;
+            height /= 2;
+        }
+
+        if ( width != widthOrig || height != heightOrig )
+            Rescale(width, height, wxIMAGE_QUALITY_HIGH);
+    }
+
+    // Set this after Rescale, which currently does not preserve it
+    M_IMGDATA->m_type = handler.GetType();
+
+    return true;
+}
+
+bool wxImage::LoadFile( wxInputStream& stream, wxBitmapType type, int index )
+{
+    AllocExclusive();
 
     wxImageHandler *handler;
 
     if ( type == wxBITMAP_TYPE_ANY )
     {
-        wxList &list=GetHandlers();
-
-        for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
+        const wxList& list = GetHandlers();
+        for ( wxList::compatibility_iterator node = list.GetFirst();
+              node;
+              node = node->GetNext() )
         {
-             handler=(wxImageHandler*)node->GetData();
-             if ( handler->CanRead(stream) )
-                 return handler->LoadFile(this, stream, true/*verbose*/, index);
-
+             handler = (wxImageHandler*)node->GetData();
+             if ( handler->CanRead(stream) && DoLoad(*handler, stream, index) )
+                 return true;
         }
 
         wxLogWarning( _("No handler found for image type.") );
+
         return false;
     }
+    //else: have specific type
 
     handler = FindHandler(type);
-
-    if (handler == 0)
+    if ( !handler )
     {
-        wxLogWarning( _("No image handler for type %d defined."), type );
-
+        wxLogWarning( _("No image handler for type %ld defined."), type );
         return false;
     }
 
-    if (stream.IsSeekable() && !handler->CanRead(stream))
+    if ( stream.IsSeekable() && !handler->CanRead(stream) )
     {
-        wxLogError(_("Image file is not of type %d."), type);
+        wxLogError(_("Image file is not of type %ld."), type);
         return false;
     }
-    else
-        return handler->LoadFile(this, stream, true/*verbose*/, index);
+
+    return DoLoad(*handler, stream, index);
 }
 
 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
@@ -1672,23 +2426,32 @@ bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int ind
 
     wxImageHandler *handler = FindHandlerMime(mimetype);
 
-    if (handler == 0)
+    if ( !handler )
     {
         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
-
         return false;
     }
 
-    if (stream.IsSeekable() && !handler->CanRead(stream))
+    if ( stream.IsSeekable() && !handler->CanRead(stream) )
     {
-        wxLogError(_("Image file is not of type %s."), (const wxChar*) mimetype);
+        wxLogError(_("Image file is not of type %s."), mimetype);
         return false;
     }
-    else
-        return handler->LoadFile( this, stream, true/*verbose*/, index );
+
+    return DoLoad(*handler, stream, index);
 }
 
-bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
+bool wxImage::DoSave(wxImageHandler& handler, wxOutputStream& stream) const
+{
+    wxImage * const self = const_cast<wxImage *>(this);
+    if ( !handler.SaveFile(self, stream) )
+        return false;
+
+    M_IMGDATA->m_type = handler.GetType();
+    return true;
+}
+
+bool wxImage::SaveFile( wxOutputStream& stream, wxBitmapType type ) const
 {
     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
 
@@ -1696,11 +2459,10 @@ bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
     if ( !handler )
     {
         wxLogWarning( _("No image handler for type %d defined."), type );
-
         return false;
     }
 
-    return handler->SaveFile( (wxImage*)this, stream );
+    return DoSave(*handler, stream);
 }
 
 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
@@ -1711,12 +2473,11 @@ bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
     if ( !handler )
     {
         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
-
-        return false;
     }
 
-    return handler->SaveFile( (wxImage*)this, stream );
+    return DoSave(*handler, stream);
 }
+
 #endif // wxUSE_STREAMS
 
 // ----------------------------------------------------------------------------
@@ -1738,7 +2499,7 @@ void wxImage::AddHandler( wxImageHandler *handler )
         // may) we should probably refcount the duplicates.
         //   also an issue in InsertHandler below.
 
-        wxLogDebug( _T("Adding duplicate image handler for '%s'"),
+        wxLogDebug( wxT("Adding duplicate image handler for '%s'"),
                     handler->GetName().c_str() );
         delete handler;
     }
@@ -1754,7 +2515,7 @@ void wxImage::InsertHandler( wxImageHandler *handler )
     else
     {
         // see AddHandler for additional comments.
-        wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
+        wxLogDebug( wxT("Inserting duplicate image handler for '%s'"),
                     handler->GetName().c_str() );
         delete handler;
     }
@@ -1783,24 +2544,28 @@ wxImageHandler *wxImage::FindHandler( const wxString& name )
 
         node = node->GetNext();
     }
-    return 0;
+    return NULL;
 }
 
-wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
+wxImageHandler *wxImage::FindHandler( const wxString& extension, wxBitmapType bitmapType )
 {
     wxList::compatibility_iterator node = sm_handlers.GetFirst();
     while (node)
     {
         wxImageHandler *handler = (wxImageHandler*)node->GetData();
-        if ( (handler->GetExtension().Cmp(extension) == 0) &&
-            (bitmapType == -1 || handler->GetType() == bitmapType) )
-            return handler;
+        if ((bitmapType == wxBITMAP_TYPE_ANY) || (handler->GetType() == bitmapType))
+        {
+            if (handler->GetExtension() == extension)
+                return handler;
+            if (handler->GetAltExtensions().Index(extension, false) != wxNOT_FOUND)
+                return handler;
+        }
         node = node->GetNext();
     }
-    return 0;
+    return NULL;
 }
 
-wxImageHandler *wxImage::FindHandler( long bitmapType )
+wxImageHandler *wxImage::FindHandler(wxBitmapType bitmapType )
 {
     wxList::compatibility_iterator node = sm_handlers.GetFirst();
     while (node)
@@ -1809,7 +2574,7 @@ wxImageHandler *wxImage::FindHandler( long bitmapType )
         if (handler->GetType() == bitmapType) return handler;
         node = node->GetNext();
     }
-    return 0;
+    return NULL;
 }
 
 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
@@ -1821,7 +2586,7 @@ wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
         node = node->GetNext();
     }
-    return 0;
+    return NULL;
 }
 
 void wxImage::InitStandardHandlers()
@@ -1855,6 +2620,8 @@ wxString wxImage::GetImageExtWildcard()
     {
         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
         fmts += wxT("*.") + Handler->GetExtension();
+        for (size_t i = 0; i < Handler->GetAltExtensions().size(); i++)
+            fmts += wxT(";*.") + Handler->GetAltExtensions()[i];
         Node = Node->GetNext();
         if ( Node ) fmts += wxT(";");
     }
@@ -2000,6 +2767,8 @@ wxImage::RGBValue wxImage::HSVtoRGB(const HSVValue& hsv)
  */
 void wxImage::RotateHue(double angle)
 {
+    AllocExclusive();
+
     unsigned char *srcBytePtr;
     unsigned char *dstBytePtr;
     unsigned long count;
@@ -2040,26 +2809,34 @@ void wxImage::RotateHue(double angle)
 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
 
 #if wxUSE_STREAMS
-bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
+int wxImageHandler::GetImageCount( wxInputStream& stream )
 {
-    return false;
-}
+    // NOTE: this code is the same of wxAnimationDecoder::CanRead and
+    //       wxImageHandler::CallDoCanRead
 
-bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
-{
-    return false;
-}
+    if ( !stream.IsSeekable() )
+        return false;        // can't test unseekable stream
 
-int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
-{
-    return 1;
+    wxFileOffset posOld = stream.TellI();
+    int n = DoGetImageCount(stream);
+
+    // restore the old position to be able to test other formats and so on
+    if ( stream.SeekI(posOld) == wxInvalidOffset )
+    {
+        wxLogDebug(wxT("Failed to rewind the stream in wxImageHandler!"));
+
+        // reading would fail anyhow as we're not at the right position
+        return false;
+    }
+
+    return n;
 }
 
 bool wxImageHandler::CanRead( const wxString& name )
 {
     if (wxFileExists(name))
     {
-        wxFileInputStream stream(name);
+        wxImageFileInputStream stream(name);
         return CanRead(stream);
     }
 
@@ -2070,19 +2847,19 @@ bool wxImageHandler::CanRead( const wxString& name )
 
 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
 {
-    wxFileOffset posOld = stream.TellI();
-    if ( posOld == wxInvalidOffset )
-    {
-        // can't test unseekable stream
-        return false;
-    }
+    // NOTE: this code is the same of wxAnimationDecoder::CanRead and
+    //       wxImageHandler::GetImageCount
+
+    if ( !stream.IsSeekable() )
+        return false;        // can't test unseekable stream
 
+    wxFileOffset posOld = stream.TellI();
     bool ok = DoCanRead(stream);
 
     // restore the old position to be able to test other formats and so on
     if ( stream.SeekI(posOld) == wxInvalidOffset )
     {
-        wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
+        wxLogDebug(wxT("Failed to rewind the stream in wxImageHandler!"));
 
         // reading would fail anyhow as we're not at the right position
         return false;
@@ -2093,6 +2870,42 @@ bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
 
 #endif // wxUSE_STREAMS
 
+/* static */
+wxImageResolution
+wxImageHandler::GetResolutionFromOptions(const wxImage& image, int *x, int *y)
+{
+    wxCHECK_MSG( x && y, wxIMAGE_RESOLUTION_NONE, wxT("NULL pointer") );
+
+    if ( image.HasOption(wxIMAGE_OPTION_RESOLUTIONX) &&
+         image.HasOption(wxIMAGE_OPTION_RESOLUTIONY) )
+    {
+        *x = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTIONX);
+        *y = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTIONY);
+    }
+    else if ( image.HasOption(wxIMAGE_OPTION_RESOLUTION) )
+    {
+        *x =
+        *y = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTION);
+    }
+    else // no resolution options specified
+    {
+        *x =
+        *y = 0;
+
+        return wxIMAGE_RESOLUTION_NONE;
+    }
+
+    // get the resolution unit too
+    int resUnit = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTIONUNIT);
+    if ( !resUnit )
+    {
+        // this is the default
+        resUnit = wxIMAGE_RESOLUTION_INCHES;
+    }
+
+    return (wxImageResolution)resUnit;
+}
+
 // ----------------------------------------------------------------------------
 // image histogram stuff
 // ----------------------------------------------------------------------------
@@ -2223,18 +3036,7 @@ unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
  * Rotation code by Carlos Moreno
  */
 
-// GRG: I've removed wxRotationPoint - we already have wxRealPoint which
-//      does exactly the same thing. And I also got rid of wxRotationPixel
-//      bacause of potential problems in architectures where alignment
-//      is an issue, so I had to rewrite parts of the code.
-
-static const double gs_Epsilon = 1e-10;
-
-static inline int wxCint (double x)
-{
-    return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
-}
-
+static const double wxROTATE_EPSILON = 1e-10;
 
 // Auxiliary function to rotate a point (x,y) with respect to point p0
 // make it inline and use a straight return to facilitate optimization
@@ -2242,42 +3044,53 @@ static inline int wxCint (double x)
 // repeating the time-consuming calls to these functions -- sin/cos can
 // be computed and stored in the calling function.
 
-inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
+static inline wxRealPoint
+wxRotatePoint(const wxRealPoint& p, double cos_angle, double sin_angle,
+              const wxRealPoint& p0)
 {
-    return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
-                        p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
+    return wxRealPoint(p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
+                       p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
 }
 
-inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
+static inline wxRealPoint
+wxRotatePoint(double x, double y, double cos_angle, double sin_angle,
+              const wxRealPoint & p0)
 {
-    return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
+    return wxRotatePoint (wxRealPoint(x,y), cos_angle, sin_angle, p0);
 }
 
-wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
+wxImage wxImage::Rotate(double angle,
+                        const wxPoint& centre_of_rotation,
+                        bool interpolating,
+                        wxPoint *offset_after_rotation) const
 {
-    int i;
-    angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
+    // screen coordinates are a mirror image of "real" coordinates
+    angle = -angle;
 
-    bool has_alpha = HasAlpha();
+    const bool has_alpha = HasAlpha();
+
+    const int w = GetWidth();
+    const int h = GetHeight();
+
+    int i;
 
     // Create pointer-based array to accelerate access to wxImage's data
-    unsigned char ** data = new unsigned char * [GetHeight()];
+    unsigned char ** data = new unsigned char * [h];
     data[0] = GetData();
-    for (i = 1; i < GetHeight(); i++)
-        data[i] = data[i - 1] + (3 * GetWidth());
+    for (i = 1; i < h; i++)
+        data[i] = data[i - 1] + (3 * w);
 
     // Same for alpha channel
     unsigned char ** alpha = NULL;
     if (has_alpha)
     {
-        alpha = new unsigned char * [GetHeight()];
+        alpha = new unsigned char * [h];
         alpha[0] = GetAlpha();
-        for (i = 1; i < GetHeight(); i++)
-            alpha[i] = alpha[i - 1] + GetWidth();
+        for (i = 1; i < h; i++)
+            alpha[i] = alpha[i - 1] + w;
     }
 
     // precompute coefficients for rotation formula
-    // (sine and cosine of the angle)
     const double cos_angle = cos(angle);
     const double sin_angle = sin(angle);
 
@@ -2287,10 +3100,10 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
 
     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
 
-    wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
-    wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
-    wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
-    wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
+    wxRealPoint p1 = wxRotatePoint (0, 0, cos_angle, sin_angle, p0);
+    wxRealPoint p2 = wxRotatePoint (0, h, cos_angle, sin_angle, p0);
+    wxRealPoint p3 = wxRotatePoint (w, 0, cos_angle, sin_angle, p0);
+    wxRealPoint p4 = wxRotatePoint (w, h, cos_angle, sin_angle, p0);
 
     int x1a = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
     int y1a = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
@@ -2308,19 +3121,14 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
         *offset_after_rotation = wxPoint (x1a, y1a);
     }
 
-    // GRG: The rotated (destination) image is always accessed
-    //      sequentially, so there is no need for a pointer-based
-    //      array here (and in fact it would be slower).
-    //
-    unsigned char * dst = rotated.GetData();
+    // the rotated (destination) image is always accessed sequentially via this
+    // pointer, there is no need for pointer-based arrays here
+    unsigned char *dst = rotated.GetData();
 
-    unsigned char * alpha_dst = NULL;
-    if (has_alpha)
-        alpha_dst = rotated.GetAlpha();
+    unsigned char *alpha_dst = has_alpha ? rotated.GetAlpha() : NULL;
 
-    // GRG: if the original image has a mask, use its RGB values
-    //      as the blank pixel, else, fall back to default (black).
-    //
+    // if the original image has a mask, use its RGB values as the blank pixel,
+    // else, fall back to default (black).
     unsigned char blank_r = 0;
     unsigned char blank_g = 0;
     unsigned char blank_b = 0;
@@ -2337,44 +3145,45 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
     // performing an inverse rotation (a rotation of -angle) and getting the
     // pixel at those coordinates
 
-    // GRG: I've taken the (interpolating) test out of the loops, so that
-    //      it is done only once, instead of repeating it for each pixel.
+    const int rH = rotated.GetHeight();
+    const int rW = rotated.GetWidth();
 
-    int x;
+    // do the (interpolating) test outside of the loops, so that it is done
+    // only once, instead of repeating it for each pixel.
     if (interpolating)
     {
-        for (int y = 0; y < rotated.GetHeight(); y++)
+        for (int y = 0; y < rH; y++)
         {
-            for (x = 0; x < rotated.GetWidth(); x++)
+            for (int x = 0; x < rW; x++)
             {
-                wxRealPoint src = rotated_point (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
+                wxRealPoint src = wxRotatePoint (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
 
-                if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
-                    -0.25 < src.y && src.y < GetHeight() - 0.75)
+                if (-0.25 < src.x && src.x < w - 0.75 &&
+                    -0.25 < src.y && src.y < h - 0.75)
                 {
                     // interpolate using the 4 enclosing grid-points.  Those
                     // points can be obtained using floor and ceiling of the
                     // exact coordinates of the point
                     int x1, y1, x2, y2;
 
-                    if (0 < src.x && src.x < GetWidth() - 1)
+                    if (0 < src.x && src.x < w - 1)
                     {
-                        x1 = wxCint(floor(src.x));
-                        x2 = wxCint(ceil(src.x));
+                        x1 = wxRound(floor(src.x));
+                        x2 = wxRound(ceil(src.x));
                     }
                     else    // else means that x is near one of the borders (0 or width-1)
                     {
-                        x1 = x2 = wxCint (src.x);
+                        x1 = x2 = wxRound (src.x);
                     }
 
-                    if (0 < src.y && src.y < GetHeight() - 1)
+                    if (0 < src.y && src.y < h - 1)
                     {
-                        y1 = wxCint(floor(src.y));
-                        y2 = wxCint(ceil(src.y));
+                        y1 = wxRound(floor(src.y));
+                        y2 = wxRound(ceil(src.y));
                     }
                     else
                     {
-                        y1 = y2 = wxCint (src.y);
+                        y1 = y2 = wxRound (src.y);
                     }
 
                     // get four points and the distances (square of the distance,
@@ -2383,7 +3192,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
                     // GRG: Do not calculate the points until they are
                     //      really needed -- this way we can calculate
                     //      just one, instead of four, if d1, d2, d3
-                    //      or d4 are < gs_Epsilon
+                    //      or d4 are < wxROTATE_EPSILON
 
                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
@@ -2396,7 +3205,8 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
                     // If the point is exactly at one point of the grid of the source
                     // image, then don't interpolate -- just assign the pixel
 
-                    if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
+                    // d1,d2,d3,d4 are positive -- no need for abs()
+                    if (d1 < wxROTATE_EPSILON)
                     {
                         unsigned char *p = data[y1] + (3 * x1);
                         *(dst++) = *(p++);
@@ -2406,7 +3216,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
                         if (has_alpha)
                             *(alpha_dst++) = *(alpha[y1] + x1);
                     }
-                    else if (d2 < gs_Epsilon)
+                    else if (d2 < wxROTATE_EPSILON)
                     {
                         unsigned char *p = data[y1] + (3 * x2);
                         *(dst++) = *(p++);
@@ -2416,7 +3226,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
                         if (has_alpha)
                             *(alpha_dst++) = *(alpha[y1] + x2);
                     }
-                    else if (d3 < gs_Epsilon)
+                    else if (d3 < wxROTATE_EPSILON)
                     {
                         unsigned char *p = data[y2] + (3 * x2);
                         *(dst++) = *(p++);
@@ -2426,7 +3236,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
                         if (has_alpha)
                             *(alpha_dst++) = *(alpha[y2] + x2);
                     }
-                    else if (d4 < gs_Epsilon)
+                    else if (d4 < wxROTATE_EPSILON)
                     {
                         unsigned char *p = data[y2] + (3 * x1);
                         *(dst++) = *(p++);
@@ -2487,19 +3297,18 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
             }
         }
     }
-    else    // not interpolating
+    else // not interpolating
     {
-        for (int y = 0; y < rotated.GetHeight(); y++)
+        for (int y = 0; y < rH; y++)
         {
-            for (x = 0; x < rotated.GetWidth(); x++)
+            for (int x = 0; x < rW; x++)
             {
-                wxRealPoint src = rotated_point (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
+                wxRealPoint src = wxRotatePoint (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
 
-                const int xs = wxCint (src.x);      // wxCint rounds to the
-                const int ys = wxCint (src.y);      // closest integer
+                const int xs = wxRound (src.x);      // wxRound rounds to the
+                const int ys = wxRound (src.y);      // closest integer
 
-                if (0 <= xs && xs < GetWidth() &&
-                    0 <= ys && ys < GetHeight())
+                if (0 <= xs && xs < w && 0 <= ys && ys < h)
                 {
                     unsigned char *p = data[ys] + (3 * xs);
                     *(dst++) = *(p++);
@@ -2523,9 +3332,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
     }
 
     delete [] data;
-
-    if (has_alpha)
-        delete [] alpha;
+    delete [] alpha;
 
     return rotated;
 }
@@ -2543,8 +3350,8 @@ class wxImageModule: public wxModule
 DECLARE_DYNAMIC_CLASS(wxImageModule)
 public:
     wxImageModule() {}
-    bool OnInit() { wxImage::InitStandardHandlers(); return true; };
-    void OnExit() { wxImage::CleanUpHandlers(); };
+    bool OnInit() { wxImage::InitStandardHandlers(); return true; }
+    void OnExit() { wxImage::CleanUpHandlers(); }
 };
 
 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)