X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/cd0bbd03d7d78094dee2691cbec7a2fd4d84a3fb..80a779275ae04443c568dca919adb26cf6f5002c:/src/common/image.cpp

diff --git a/src/common/image.cpp b/src/common/image.cpp
index 35acc5ef6d..a2674529de 100644
--- a/src/common/image.cpp
+++ b/src/common/image.cpp
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        image.cpp
+// Name:        src/common/image.cpp
 // Purpose:     wxImage
 // Author:      Robert Roebling
 // RCS-ID:      $Id$
@@ -7,10 +7,6 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-#pragma implementation "image.h"
-#endif
-
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
@@ -18,31 +14,44 @@
     #pragma hdrstop
 #endif
 
-#include "wx/defs.h"
-
 #if wxUSE_IMAGE
 
 #include "wx/image.h"
-#include "wx/bitmap.h"
-#include "wx/debug.h"
-#include "wx/log.h"
-#include "wx/app.h"
+
+#ifndef WX_PRECOMP
+    #include "wx/log.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"
+#endif
+
 #include "wx/filefn.h"
 #include "wx/wfstream.h"
-#include "wx/intl.h"
-#include "wx/module.h"
-#include "wx/hash.h"
-#include "wx/utils.h"
-#include "wx/math.h"
+#include "wx/xpmdecod.h"
 
 // For memcpy
 #include <string.h>
 
-#ifdef __SALFORDC__
-    #undef FAR
+// 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_FILE
+        typedef wxFileInputStream wxImageFileInputStream;
+        typedef wxFileOutputStream wxImageFileOutputStream;
+    #elif wxUSE_FFILE
+        typedef wxFFileInputStream wxImageFileInputStream;
+        typedef wxFFileOutputStream wxImageFileOutputStream;
+    #endif // wxUSE_FILE/wxUSE_FFILE
+#endif // HAS_FILE_STREAMS
+
+#if wxUSE_VARIANT
+IMPLEMENT_VARIANT_OBJECT_EXPORTED(wxImage,WXDLLEXPORT)
 #endif
 
-
 //-----------------------------------------------------------------------------
 // wxImage
 //-----------------------------------------------------------------------------
@@ -64,8 +73,13 @@ public:
     unsigned char  *m_alpha;
 
     bool            m_ok;
+
+    // if true, m_data is pointer to static data and shouldn't be freed
     bool            m_static;
 
+    // same as m_static but for m_alpha
+    bool            m_staticAlpha;
+
 #if wxUSE_PALETTE
     wxPalette       m_palette;
 #endif // wxUSE_PALETTE
@@ -89,16 +103,16 @@ wxImageRefData::wxImageRefData()
     m_hasMask = false;
 
     m_ok = false;
-    m_static = false;
+    m_static =
+    m_staticAlpha = false;
 }
 
 wxImageRefData::~wxImageRefData()
 {
-    if (!m_static)
-    {
+    if ( !m_static )
         free( m_data );
+    if ( !m_staticAlpha )
         free( m_alpha );
-    }
 }
 
 wxList wxImage::sm_handlers;
@@ -107,7 +121,7 @@ wxImage wxNullImage;
 
 //-----------------------------------------------------------------------------
 
-#define M_IMGDATA ((wxImageRefData *)m_refData)
+#define M_IMGDATA wx_static_cast(wxImageRefData*, m_refData)
 
 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
 
@@ -148,15 +162,22 @@ wxImage::wxImage( wxInputStream& stream, const wxString& mimetype, int index )
 }
 #endif // wxUSE_STREAMS
 
-wxImage::wxImage( const wxImage& image )
-    : wxObject()
+wxImage::wxImage(const char* const* xpmData)
 {
-    Ref(image);
+    Create(xpmData);
 }
 
-wxImage::wxImage( const wxImage* image )
+bool wxImage::Create(const char* const* xpmData)
 {
-    if (image) Ref(*image);
+#if wxUSE_XPM
+    UnRef();
+
+    wxXPMDecoder decoder;
+    (*this) = decoder.ReadData(xpmData);
+    return Ok();
+#else
+    return false;
+#endif
 }
 
 bool wxImage::Create( int width, int height, bool clear )
@@ -222,27 +243,48 @@ void wxImage::Destroy()
     UnRef();
 }
 
-wxImage wxImage::Copy() const
+wxObjectRefData* wxImage::CreateRefData() const
 {
-    wxImage image;
-
-    wxCHECK_MSG( Ok(), image, wxT("invalid image") );
-
-    image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
+    return new wxImageRefData;
+}
 
-    unsigned char *data = image.GetData();
+wxObjectRefData* wxImage::CloneRefData(const wxObjectRefData* that) const
+{
+    const wxImageRefData* refData = wx_static_cast(const wxImageRefData*, that);
+    wxCHECK_MSG(refData->m_ok, NULL, wxT("invalid image") );
 
-    wxCHECK_MSG( data, image, wxT("unable to create image") );
+    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)
+    {
+        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;
+}
 
-    image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
-    image.SetMask( M_IMGDATA->m_hasMask );
+wxImage wxImage::Copy() const
+{
+    wxImage image;
 
-    memcpy( data, GetData(), M_IMGDATA->m_width*M_IMGDATA->m_height*3 );
+    wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 
-    // also copy the image options
-    wxImageRefData *imgData = (wxImageRefData *)image.m_refData;
-    imgData->m_optionNames = M_IMGDATA->m_optionNames;
-    imgData->m_optionValues = M_IMGDATA->m_optionValues;
+    image.m_refData = CloneRefData(m_refData);
 
     return image;
 }
@@ -250,7 +292,7 @@ wxImage wxImage::Copy() const
 wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
 {
     if( xFactor == 1 && yFactor == 1 )
-        return Copy() ;
+        return *this;
 
     wxImage image;
 
@@ -357,7 +399,7 @@ wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
         }
     }
 
-    // In case this is a cursor, make sure the hotspot is scalled accordingly:
+    // 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))/xFactor);
@@ -368,7 +410,7 @@ 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, int quality ) const
 {
     wxImage image;
 
@@ -383,52 +425,94 @@ 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;
+
+    // Scale the image (...or more appropriately, resample the image) using
+    // either the high-quality or normal method as specified
+    if ( quality == wxIMAGE_QUALITY_HIGH )
     {
-        return ShrinkBy( old_width / width , old_height / height ) ;
+        // We need to check whether we are downsampling or upsampling the image
+        if ( width < old_width && height < old_height )
+        {
+            // Downsample the image using the box averaging method for best results
+            image = ResampleBox(width, height);
+        }
+        else
+        {
+            // For upsampling or other random/wierd image dimensions we'll use
+            // a bicubic b-spline scaling method
+            image = ResampleBicubic(width, height);
+        }
     }
-    image.Create( width, height, false );
+    else    // Default scaling method == simple pixel replication
+    {
+        if ( old_width % width == 0 && old_width >= width &&
+            old_height % height == 0 && old_height >= height )
+        {
+            return ShrinkBy( old_width / width , old_height / height ) ;
+        }
+        image.Create( width, height, false );
 
-    unsigned char *data = image.GetData();
+        unsigned char *data = image.GetData();
 
-    wxCHECK_MSG( data, image, wxT("unable to create image") );
+        wxCHECK_MSG( data, image, wxT("unable to create image") );
 
-    if (M_IMGDATA->m_hasMask)
-    {
-        image.SetMaskColour( M_IMGDATA->m_maskRed,
-                             M_IMGDATA->m_maskGreen,
-                             M_IMGDATA->m_maskBlue );
-    }
+        unsigned char *source_data = M_IMGDATA->m_data;
+        unsigned char *target_data = data;
+        unsigned char *source_alpha = 0 ;
+        unsigned char *target_alpha = 0 ;
 
-    unsigned char *source_data = M_IMGDATA->m_data;
-    unsigned char *target_data = data;
+        if ( !M_IMGDATA->m_hasMask )
+        {
+            source_alpha = M_IMGDATA->m_alpha ;
+            if ( source_alpha )
+            {
+                image.SetAlpha() ;
+                target_alpha = image.GetAlpha() ;
+            }
+        }
 
-    long x_delta = (old_width<<16) / width;
-    long y_delta = (old_height<<16) / height;
+        long x_delta = (old_width<<16) / width;
+        long y_delta = (old_height<<16) / height;
 
-    unsigned char* dest_pixel = target_data;
+        unsigned char* dest_pixel = target_data;
 
-    long y = 0;
-    for ( long j = 0; j < height; j++ )
+        long y = 0;
+        for ( long j = 0; j < height; j++ )
         {
-        unsigned char* src_line = &source_data[(y>>16)*old_width*3];
+            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];
-             dest_pixel[0] = src_pixel[0];
-             dest_pixel[1] = src_pixel[1];
-             dest_pixel[2] = src_pixel[2];
-             dest_pixel += 3;
-             x += x_delta;
+            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 )
+                    *(target_alpha++) = *src_alpha_pixel ;
+                x += x_delta;
+            }
+
+            y += y_delta;
         }
+    }
 
-        y += y_delta;
+    // If the original image has a mask, apply the mask to the new image
+    if (M_IMGDATA->m_hasMask)
+    {
+        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 scalled accordingly:
+    // 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);
@@ -439,6 +523,474 @@ wxImage wxImage::Scale( int width, int height ) const
     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);
+
+    // If we want good-looking results we need to pre-blur the image a bit first
+    wxImage src_image(*this);
+    src_image = src_image.BlurHorizontal(scale_factor_x_2);
+    src_image = src_image.BlurVertical(scale_factor_y_2);
+
+    unsigned char* src_data = src_image.GetData();
+    unsigned char* src_alpha = src_image.GetAlpha();
+    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 )
+                    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 )
+                        continue;
+
+                    // Calculate the actual index in our source pixels
+                    src_pixel_index = src_y * M_IMGDATA->m_width + src_x;
+
+                    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;
+}
+
+// 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 = 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 = 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)
+{
+    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 ( M_IMGDATA->m_hasMask )
+    {
+        ret_image.SetMaskColour(M_IMGDATA->m_maskRed,
+                                M_IMGDATA->m_maskGreen,
+                                M_IMGDATA->m_maskBlue);
+    }
+    else
+    {
+        if ( src_alpha )
+        {
+            ret_image.SetAlpha();
+            dst_alpha = ret_image.GetAlpha();
+        }
+    }
+
+    // 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)
+{
+    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 ( M_IMGDATA->m_hasMask )
+    {
+        ret_image.SetMaskColour(M_IMGDATA->m_maskRed,
+                                M_IMGDATA->m_maskGreen,
+                                M_IMGDATA->m_maskBlue);
+    }
+    else
+    {
+        if ( src_alpha )
+        {
+            ret_image.SetAlpha();
+            dst_alpha = ret_image.GetAlpha();
+        }
+    }
+
+    // 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)
+{
+    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;
@@ -451,25 +1003,53 @@ wxImage wxImage::Rotate90( bool clockwise ) const
 
     wxCHECK_MSG( data, image, wxT("unable to create image") );
 
+    unsigned char *source_data = M_IMGDATA->m_data;
+    unsigned char *target_data;
+    unsigned char *alpha_data = 0 ;
+    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
+    {
+        source_alpha = M_IMGDATA->m_alpha ;
+        if ( source_alpha )
+        {
+            image.SetAlpha() ;
+            alpha_data = image.GetAlpha() ;
+        }
+    }
 
     long height = M_IMGDATA->m_height;
     long width  = M_IMGDATA->m_width;
 
-    unsigned char *source_data = M_IMGDATA->m_data;
-    unsigned char *target_data;
-
     for (long j = 0; j < height; j++)
     {
         for (long i = 0; i < width; i++)
         {
             if (clockwise)
+            {
                 target_data = data + (((i+1)*height) - j - 1)*3;
+                if(source_alpha)
+                    target_alpha = alpha_data + (((i+1)*height) - j - 1);
+            }
             else
+            {
                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
+                if(source_alpha)
+                    target_alpha = alpha_data + ((height*(width-1)) + j - (i*height));
+            }
             memcpy( target_data, source_data, 3 );
             source_data += 3;
+
+            if(source_alpha)
+            {
+                memcpy( target_alpha, source_alpha, 1 );
+                source_alpha += 1;
+            }
         }
     }
 
@@ -485,9 +1065,16 @@ wxImage wxImage::Mirror( bool horizontally ) const
     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 
     unsigned char *data = image.GetData();
+    unsigned char *alpha = NULL;
 
     wxCHECK_MSG( data, image, wxT("unable to create image") );
 
+    if (M_IMGDATA->m_alpha != NULL) {
+        image.SetAlpha();
+        alpha = image.GetAlpha();
+        wxCHECK_MSG( alpha, image, wxT("unable to create alpha channel") );
+    }
+
     if (M_IMGDATA->m_hasMask)
         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 
@@ -510,6 +1097,25 @@ wxImage wxImage::Mirror( bool horizontally ) const
                 target_data -= 3;
             }
         }
+
+        if (alpha != NULL)
+        {
+            // src_alpha starts at the first pixel and increases by 1 after each step
+            // (a step here is the copy of the alpha value of one pixel)
+            const unsigned char *src_alpha = M_IMGDATA->m_alpha;
+            // dest_alpha starts just beyond the first line, decreases before each step,
+            // and after each line is finished, increases by 2 widths (skipping the line
+            // just copied and the line that will be copied next)
+            unsigned char *dest_alpha = alpha + width;
+
+            for (long jj = 0; jj < height; ++jj)
+            {
+                for (long i = 0; i < width; ++i) {
+                    *(--dest_alpha) = *(src_alpha++); // copy one pixel
+                }
+                dest_alpha += 2 * width; // advance beyond the end of the next line
+            }
+        }
     }
     else
     {
@@ -519,6 +1125,23 @@ wxImage wxImage::Mirror( bool horizontally ) const
             memcpy( target_data, source_data, (size_t)3*width );
             source_data += 3*width;
         }
+
+        if (alpha != NULL)
+        {
+            // src_alpha starts at the first pixel and increases by 1 width after each step
+            // (a step here is the copy of the alpha channel of an entire line)
+            const unsigned char *src_alpha = M_IMGDATA->m_alpha;
+            // dest_alpha starts just beyond the last line (beyond the whole image)
+            // and decreases by 1 width before each step
+            unsigned char *dest_alpha = alpha + width * height;
+
+            for (long jj = 0; jj < height; ++jj)
+            {
+                dest_alpha -= width;
+                memcpy( dest_alpha, src_alpha, (size_t)width );
+                src_alpha += width;
+            }
+        }
     }
 
     return image;
@@ -530,32 +1153,89 @@ wxImage wxImage::GetSubImage( const wxRect &rect ) const
 
     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 
-    wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) && (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
+    wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) &&
+                 (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
                  image, wxT("invalid subimage size") );
 
-    int subwidth=rect.GetWidth();
-    const int subheight=rect.GetHeight();
+    const int subwidth = rect.GetWidth();
+    const int subheight = rect.GetHeight();
 
     image.Create( subwidth, subheight, false );
 
-    unsigned char *subdata = image.GetData(), *data=GetData();
+    const unsigned char *src_data = GetData();
+    const unsigned char *src_alpha = M_IMGDATA->m_alpha;
+    unsigned char *subdata = image.GetData();
+    unsigned char *subalpha = NULL;
 
     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
 
+    if (src_alpha != NULL) {
+        image.SetAlpha();
+        subalpha = image.GetAlpha();
+        wxCHECK_MSG( subalpha, image, wxT("unable to create alpha channel"));
+    }
+
     if (M_IMGDATA->m_hasMask)
         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 
-    const int subleft=3*rect.GetLeft();
-    const int width=3*GetWidth();
-    subwidth*=3;
+    const int width = GetWidth();
+    const int pixsoff = rect.GetLeft() + width * rect.GetTop();
 
-    data+=rect.GetTop()*width+subleft;
+    src_data += 3 * pixsoff;
+    src_alpha += pixsoff; // won't be used if was NULL, so this is ok
 
     for (long j = 0; j < subheight; ++j)
     {
-        memcpy( subdata, data, subwidth);
-        subdata+=subwidth;
-        data+=width;
+        memcpy( subdata, src_data, 3 * subwidth );
+        subdata += 3 * subwidth;
+        src_data += 3 * width;
+        if (subalpha != NULL) {
+            memcpy( subalpha, src_alpha, subwidth );
+            subalpha += subwidth;
+            src_alpha += width;
+        }
+    }
+
+    return image;
+}
+
+wxImage wxImage::Size( const wxSize& size, const wxPoint& pos,
+                       int r_, int g_, int b_ ) const
+{
+    wxImage image;
+
+    wxCHECK_MSG( Ok(), image, wxT("invalid image") );
+    wxCHECK_MSG( (size.GetWidth() > 0) && (size.GetHeight() > 0), image, wxT("invalid size") );
+
+    int width = GetWidth(), height = GetHeight();
+    image.Create(size.GetWidth(), size.GetHeight(), false);
+
+    unsigned char r = (unsigned char)r_;
+    unsigned char g = (unsigned char)g_;
+    unsigned char b = (unsigned char)b_;
+    if ((r_ == -1) && (g_ == -1) && (b_ == -1))
+    {
+        GetOrFindMaskColour( &r, &g, &b );
+        image.SetMaskColour(r, g, b);
+    }
+
+    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;
+
+    subRect.Intersect(finalRect);
+
+    if (!subRect.IsEmpty())
+    {
+        if ((subRect.GetWidth() == width) && (subRect.GetHeight() == height))
+            image.Paste(*this, pos.x, pos.y);
+        else
+            image.Paste(GetSubImage(subRect), pos.x, pos.y);
     }
 
     return image;
@@ -566,6 +1246,8 @@ 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();
@@ -591,6 +1273,7 @@ void wxImage::Paste( const wxImage &image, int x, int y )
     if (height < 1) return;
 
     if ((!HasMask() && !image.HasMask()) ||
+        (HasMask() && !image.HasMask()) ||
        ((HasMask() && image.HasMask() &&
          (GetMaskRed()==image.GetMaskRed()) &&
          (GetMaskGreen()==image.GetMaskGreen()) &&
@@ -628,8 +1311,8 @@ void wxImage::Paste( const wxImage &image, int x, int y )
         {
             for (int i = 0; i < width; 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 );
@@ -646,6 +1329,8 @@ 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();
@@ -664,6 +1349,56 @@ void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
         }
 }
 
+wxImage wxImage::ConvertToGreyscale( double lr, double lg, double lb ) const
+{
+    wxImage image;
+
+    wxCHECK_MSG( Ok(), image, wxT("invalid image") );
+
+    image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
+
+    unsigned char *dest = image.GetData();
+
+    wxCHECK_MSG( dest, image, wxT("unable to create image") );
+
+    unsigned char *src = M_IMGDATA->m_data;
+    bool hasMask = M_IMGDATA->m_hasMask;
+    unsigned char maskRed = M_IMGDATA->m_maskRed;
+    unsigned char maskGreen = M_IMGDATA->m_maskGreen;
+    unsigned char maskBlue = M_IMGDATA->m_maskBlue;
+
+    if ( hasMask )
+        image.SetMaskColour(maskRed, maskGreen, maskBlue);
+
+    const long size = M_IMGDATA->m_width * M_IMGDATA->m_height;
+    for ( long i = 0; i < size; i++, src += 3, dest += 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);
+        }
+    }
+
+    // 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;
+}
+
 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
 {
     wxImage image;
@@ -701,65 +1436,115 @@ wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char
     return image;
 }
 
-void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
+int wxImage::GetWidth() const
 {
-    wxCHECK_RET( Ok(), wxT("invalid image") );
+    wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 
-    int w = M_IMGDATA->m_width;
-    int h = M_IMGDATA->m_height;
+    return M_IMGDATA->m_width;
+}
+
+int wxImage::GetHeight() const
+{
+    wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 
-    wxCHECK_RET( (x>=0) && (y>=0) && (x<w) && (y<h), wxT("invalid image index") );
+    return M_IMGDATA->m_height;
+}
 
-    long pos = (y * w + x) * 3;
+long wxImage::XYToIndex(int x, int y) const
+{
+    if ( Ok() &&
+            x >= 0 && y >= 0 &&
+                x < M_IMGDATA->m_width && y < M_IMGDATA->m_height )
+    {
+        return y*M_IMGDATA->m_width + x;
+    }
+
+    return -1;
+}
+
+void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
+{
+    long pos = XYToIndex(x, y);
+    wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
+
+    AllocExclusive();
+
+    pos *= 3;
 
     M_IMGDATA->m_data[ pos   ] = r;
     M_IMGDATA->m_data[ pos+1 ] = g;
     M_IMGDATA->m_data[ pos+2 ] = b;
 }
 
-unsigned char wxImage::GetRed( int x, int y ) const
+void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, unsigned char b )
 {
-    wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
+    wxCHECK_RET( Ok(), wxT("invalid image") );
 
-    int w = M_IMGDATA->m_width;
-    int h = M_IMGDATA->m_height;
+    AllocExclusive();
 
-    wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
+    wxRect rect(rect_);
+    wxRect imageRect(0, 0, GetWidth(), GetHeight());
+    if ( rect == wxRect() )
+    {
+        rect = imageRect;
+    }
+    else
+    {
+        wxCHECK_RET( imageRect.Contains(rect.GetTopLeft()) &&
+                     imageRect.Contains(rect.GetBottomRight()),
+                     wxT("invalid bounding rectangle") );
+    }
 
-    long pos = (y * w + x) * 3;
+    int x1 = rect.GetLeft(),
+        y1 = rect.GetTop(),
+        x2 = rect.GetRight() + 1,
+        y2 = rect.GetBottom() + 1;
 
-    return M_IMGDATA->m_data[pos];
+    unsigned char *data wxDUMMY_INITIALIZE(NULL);
+    int x, y, width = GetWidth();
+    for (y = y1; y < y2; y++)
+    {
+        data = M_IMGDATA->m_data + (y*width + x1)*3;
+        for (x = x1; x < x2; x++)
+        {
+            *data++ = r;
+            *data++ = g;
+            *data++ = b;
+        }
+    }
 }
 
-unsigned char wxImage::GetGreen( int x, int y ) const
+unsigned char wxImage::GetRed( int x, int y ) const
 {
-    wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
+    long pos = XYToIndex(x, y);
+    wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
+
+    pos *= 3;
 
-    int w = M_IMGDATA->m_width;
-    int h = M_IMGDATA->m_height;
+    return M_IMGDATA->m_data[pos];
+}
 
-    wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
+unsigned char wxImage::GetGreen( int x, int y ) const
+{
+    long pos = XYToIndex(x, y);
+    wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 
-    long pos = (y * w + x) * 3;
+    pos *= 3;
 
     return M_IMGDATA->m_data[pos+1];
 }
 
 unsigned char wxImage::GetBlue( int x, int y ) const
 {
-    wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
-
-    int w = M_IMGDATA->m_width;
-    int h = M_IMGDATA->m_height;
+    long pos = XYToIndex(x, y);
+    wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 
-    wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
-
-    long pos = (y * w + x) * 3;
+    pos *= 3;
 
     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
@@ -774,7 +1559,7 @@ unsigned char *wxImage::GetData() const
     return M_IMGDATA->m_data;
 }
 
-void wxImage::SetData( unsigned char *data )
+void wxImage::SetData( unsigned char *data, bool static_data  )
 {
     wxCHECK_RET( Ok(), wxT("invalid image") );
 
@@ -788,13 +1573,14 @@ void wxImage::SetData( unsigned char *data )
     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
+    newRefData->m_static = static_data;
 
     UnRef();
 
     m_refData = newRefData;
 }
 
-void wxImage::SetData( unsigned char *data, int new_width, int new_height )
+void wxImage::SetData( unsigned char *data, int new_width, int new_height, bool static_data )
 {
     wxImageRefData *newRefData = new wxImageRefData();
 
@@ -816,6 +1602,7 @@ void wxImage::SetData( unsigned char *data, int new_width, int new_height )
         newRefData->m_data = data;
         newRefData->m_ok = true;
     }
+    newRefData->m_static = static_data;
 
     UnRef();
 
@@ -828,59 +1615,57 @@ void wxImage::SetData( unsigned char *data, int new_width, int new_height )
 
 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
 {
-    wxCHECK_RET( Ok() && HasAlpha(), wxT("invalid image or no alpha channel") );
+    wxCHECK_RET( HasAlpha(), wxT("no alpha channel") );
 
-    int w = M_IMGDATA->m_width,
-        h = M_IMGDATA->m_height;
+    long pos = XYToIndex(x, y);
+    wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
 
-    wxCHECK_RET( x >=0 && y >= 0 && x < w && y < h, wxT("invalid image index") );
+    AllocExclusive();
 
-    M_IMGDATA->m_alpha[y*w + x] = alpha;
+    M_IMGDATA->m_alpha[pos] = alpha;
 }
 
 unsigned char wxImage::GetAlpha(int x, int y) const
 {
-    wxCHECK_MSG( Ok() && HasAlpha(), 0, wxT("invalid image or no alpha channel") );
-
-    int w = M_IMGDATA->m_width,
-        h = M_IMGDATA->m_height;
+    wxCHECK_MSG( HasAlpha(), 0, wxT("no alpha channel") );
 
-    wxCHECK_MSG( x >=0 && y >= 0 && x < w && y < h, 0, wxT("invalid image index") );
+    long pos = XYToIndex(x, y);
+    wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
 
-    return M_IMGDATA->m_alpha[y*w + x];
+    return M_IMGDATA->m_alpha[pos];
 }
 
-bool wxImage::ConvertColourToAlpha( unsigned char r, unsigned char g, unsigned char b )
+bool
+wxImage::ConvertColourToAlpha(unsigned char r, unsigned char g, unsigned char b)
 {
-    SetAlpha( NULL );
+    SetAlpha(NULL);
 
-    int w = M_IMGDATA->m_width,
-        h = M_IMGDATA->m_height;
+    const int w = M_IMGDATA->m_width;
+    const int h = M_IMGDATA->m_height;
 
     unsigned char *alpha = GetAlpha();
     unsigned char *data = GetData();
 
-    int x,y;
-    for (y = 0; y < h; y++)
-        for (x = 0; x < w; x++)
-            {
-                *alpha = *data;
-                alpha++;
-                *data = r;
-                data++;
-                *data = g;
-                data++;
-                *data = b;
-                data++;
-            }
+    for ( int y = 0; y < h; y++ )
+    {
+        for ( int x = 0; x < w; x++ )
+        {
+            *alpha++ = *data;
+            *data++ = r;
+            *data++ = g;
+            *data++ = b;
+        }
+    }
 
     return true;
 }
 
-void wxImage::SetAlpha( unsigned char *alpha )
+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);
@@ -888,6 +1673,7 @@ void wxImage::SetAlpha( unsigned char *alpha )
 
     free(M_IMGDATA->m_alpha);
     M_IMGDATA->m_alpha = alpha;
+    M_IMGDATA->m_staticAlpha = static_data;
 }
 
 unsigned char *wxImage::GetAlpha() const
@@ -897,6 +1683,42 @@ unsigned char *wxImage::GetAlpha() const
     return M_IMGDATA->m_alpha;
 }
 
+void wxImage::InitAlpha()
+{
+    wxCHECK_RET( !HasAlpha(), wxT("image already has an alpha channel") );
+
+    // initialize memory for alpha channel
+    SetAlpha();
+
+    unsigned char *alpha = M_IMGDATA->m_alpha;
+    const size_t lenAlpha = M_IMGDATA->m_width * M_IMGDATA->m_height;
+
+    if ( HasMask() )
+    {
+        // use the mask to initialize the alpha channel.
+        const unsigned char * const alphaEnd = alpha + lenAlpha;
+
+        const unsigned char mr = M_IMGDATA->m_maskRed;
+        const unsigned char mg = M_IMGDATA->m_maskGreen;
+        const unsigned char mb = M_IMGDATA->m_maskBlue;
+        for ( unsigned char *src = M_IMGDATA->m_data;
+              alpha < alphaEnd;
+              src += 3, alpha++ )
+        {
+            *alpha = (src[0] == mr && src[1] == mg && src[2] == mb)
+                            ? wxIMAGE_ALPHA_TRANSPARENT
+                            : wxIMAGE_ALPHA_OPAQUE;
+        }
+
+        M_IMGDATA->m_hasMask = false;
+    }
+    else // no mask
+    {
+        // make the image fully opaque
+        memset(alpha, wxIMAGE_ALPHA_OPAQUE, lenAlpha);
+    }
+}
+
 // ----------------------------------------------------------------------------
 // mask support
 // ----------------------------------------------------------------------------
@@ -905,12 +1727,32 @@ 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;
     M_IMGDATA->m_hasMask = true;
 }
 
+bool wxImage::GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const
+{
+    wxCHECK_MSG( Ok(), false, wxT("invalid image") );
+
+    if (M_IMGDATA->m_hasMask)
+    {
+        if (r) *r = M_IMGDATA->m_maskRed;
+        if (g) *g = M_IMGDATA->m_maskGreen;
+        if (b) *b = M_IMGDATA->m_maskBlue;
+        return true;
+    }
+    else
+    {
+        FindFirstUnusedColour(r, g, b);
+        return false;
+    }
+}
+
 unsigned char wxImage::GetMaskRed() const
 {
     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
@@ -936,6 +1778,8 @@ void wxImage::SetMask( bool mask )
 {
     wxCHECK_RET( Ok(), wxT("invalid image") );
 
+    AllocExclusive();
+
     M_IMGDATA->m_hasMask = mask;
 }
 
@@ -946,18 +1790,35 @@ bool wxImage::HasMask() const
     return M_IMGDATA->m_hasMask;
 }
 
-int wxImage::GetWidth() const
+bool wxImage::IsTransparent(int x, int y, unsigned char threshold) const
 {
-    wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
+    long pos = XYToIndex(x, y);
+    wxCHECK_MSG( pos != -1, false, wxT("invalid image coordinates") );
 
-    return M_IMGDATA->m_width;
-}
+    // check mask
+    if ( M_IMGDATA->m_hasMask )
+    {
+        const unsigned char *p = M_IMGDATA->m_data + 3*pos;
+        if ( p[0] == M_IMGDATA->m_maskRed &&
+                p[1] == M_IMGDATA->m_maskGreen &&
+                    p[2] == M_IMGDATA->m_maskBlue )
+        {
+            return true;
+        }
+    }
 
-int wxImage::GetHeight() const
-{
-    wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
+    // then check alpha
+    if ( M_IMGDATA->m_alpha )
+    {
+        if ( M_IMGDATA->m_alpha[pos] < threshold )
+        {
+            // transparent enough
+            return true;
+        }
+    }
 
-    return M_IMGDATA->m_height;
+    // not transparent
+    return false;
 }
 
 bool wxImage::SetMaskFromImage(const wxImage& mask,
@@ -978,6 +1839,8 @@ bool wxImage::SetMaskFromImage(const wxImage& mask,
         return false ;
     }
 
+    AllocExclusive();
+
     unsigned char *imgdata = GetData();
     unsigned char *maskdata = mask.GetData();
 
@@ -1017,6 +1880,8 @@ bool wxImage::ConvertAlphaToMask(unsigned char threshold)
         return false;
     }
 
+    AllocExclusive();
+
     SetMask(true);
     SetMaskColour(mr, mg, mb);
 
@@ -1045,9 +1910,11 @@ bool wxImage::ConvertAlphaToMask(unsigned char threshold)
     return true;
 }
 
-#if wxUSE_PALETTE
-
+// ----------------------------------------------------------------------------
 // Palette functions
+// ----------------------------------------------------------------------------
+
+#if wxUSE_PALETTE
 
 bool wxImage::HasPalette() const
 {
@@ -1068,16 +1935,23 @@ void wxImage::SetPalette(const wxPalette& palette)
 {
     wxCHECK_RET( Ok(), wxT("invalid image") );
 
+    AllocExclusive();
+
     M_IMGDATA->m_palette = palette;
 }
 
 #endif // wxUSE_PALETTE
 
+// ----------------------------------------------------------------------------
 // Option functions (arbitrary name/value mapping)
+// ----------------------------------------------------------------------------
+
 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)
     {
@@ -1111,8 +1985,6 @@ wxString wxImage::GetOption(const wxString& name) const
 
 int wxImage::GetOptionInt(const wxString& name) const
 {
-    wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
-
     return wxAtoi(GetOption(name));
 }
 
@@ -1123,12 +1995,18 @@ bool wxImage::HasOption(const wxString& name) const
     return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
 }
 
-bool wxImage::LoadFile( const wxString& filename, long type, int index )
+// ----------------------------------------------------------------------------
+// image I/O
+// ----------------------------------------------------------------------------
+
+bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
+                        long 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);
     }
@@ -1138,17 +2016,19 @@ 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);
     }
@@ -1158,9 +2038,9 @@ 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
 }
 
 
@@ -1181,56 +2061,63 @@ bool wxImage::SaveFile( const wxString& filename ) const
     return false;
 }
 
-bool wxImage::SaveFile( const wxString& filename, int type ) const
+bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
+                        int 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),
+                            long 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;
@@ -1276,7 +2163,7 @@ 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;
     }
 
@@ -1286,7 +2173,7 @@ 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;
     }
 }
@@ -1319,12 +2206,18 @@ bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
 
     if (handler == 0)
     {
-        wxLogWarning( _("No image handler for type %d defined."), type );
+        wxLogWarning( _("No image handler for type %ld defined."), type );
 
         return false;
     }
 
-    return handler->LoadFile(this, stream, true/*verbose*/, index);
+    if (stream.IsSeekable() && !handler->CanRead(stream))
+    {
+        wxLogError(_("Image file is not of type %ld."), type);
+        return false;
+    }
+    else
+        return handler->LoadFile(this, stream, true/*verbose*/, index);
 }
 
 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
@@ -1342,7 +2235,13 @@ bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int ind
         return false;
     }
 
-    return handler->LoadFile( this, stream, true/*verbose*/, index );
+    if (stream.IsSeekable() && !handler->CanRead(stream))
+    {
+        wxLogError(_("Image file is not of type %s."), (const wxChar*) mimetype);
+        return false;
+    }
+    else
+        return handler->LoadFile( this, stream, true/*verbose*/, index );
 }
 
 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
@@ -1350,8 +2249,7 @@ bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
 
     wxImageHandler *handler = FindHandler(type);
-
-    if (handler == 0)
+    if ( !handler )
     {
         wxLogWarning( _("No image handler for type %d defined."), type );
 
@@ -1366,8 +2264,7 @@ bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
 
     wxImageHandler *handler = FindHandlerMime(mimetype);
-
-    if (handler == 0)
+    if ( !handler )
     {
         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
 
@@ -1378,6 +2275,10 @@ bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
 }
 #endif // wxUSE_STREAMS
 
+// ----------------------------------------------------------------------------
+// image I/O handlers
+// ----------------------------------------------------------------------------
+
 void wxImage::AddHandler( wxImageHandler *handler )
 {
     // Check for an existing handler of the type being added.
@@ -1517,6 +2418,179 @@ wxString wxImage::GetImageExtWildcard()
     return wxT("(") + fmts + wxT(")|") + fmts;
 }
 
+wxImage::HSVValue wxImage::RGBtoHSV(const RGBValue& rgb)
+{
+    const double red = rgb.red / 255.0,
+                 green = rgb.green / 255.0,
+                 blue = rgb.blue / 255.0;
+
+    // find the min and max intensity (and remember which one was it for the
+    // latter)
+    double minimumRGB = red;
+    if ( green < minimumRGB )
+        minimumRGB = green;
+    if ( blue < minimumRGB )
+        minimumRGB = blue;
+
+    enum { RED, GREEN, BLUE } chMax = RED;
+    double maximumRGB = red;
+    if ( green > maximumRGB )
+    {
+        chMax = GREEN;
+        maximumRGB = green;
+    }
+    if ( blue > maximumRGB )
+    {
+        chMax = BLUE;
+        maximumRGB = blue;
+    }
+
+    const double value = maximumRGB;
+
+    double hue = 0.0, saturation;
+    const double deltaRGB = maximumRGB - minimumRGB;
+    if ( wxIsNullDouble(deltaRGB) )
+    {
+        // Gray has no color
+        hue = 0.0;
+        saturation = 0.0;
+    }
+    else
+    {
+        switch ( chMax )
+        {
+            case RED:
+                hue = (green - blue) / deltaRGB;
+                break;
+
+            case GREEN:
+                hue = 2.0 + (blue - red) / deltaRGB;
+                break;
+
+            case BLUE:
+                hue = 4.0 + (red - green) / deltaRGB;
+                break;
+
+            default:
+                wxFAIL_MSG(wxT("hue not specified"));
+                break;
+        }
+
+        hue /= 6.0;
+
+        if ( hue < 0.0 )
+            hue += 1.0;
+
+        saturation = deltaRGB / maximumRGB;
+    }
+
+    return HSVValue(hue, saturation, value);
+}
+
+wxImage::RGBValue wxImage::HSVtoRGB(const HSVValue& hsv)
+{
+    double red, green, blue;
+
+    if ( wxIsNullDouble(hsv.saturation) )
+    {
+        // Grey
+        red = hsv.value;
+        green = hsv.value;
+        blue = hsv.value;
+    }
+    else // not grey
+    {
+        double hue = hsv.hue * 6.0;      // sector 0 to 5
+        int i = (int)floor(hue);
+        double f = hue - i;          // fractional part of h
+        double p = hsv.value * (1.0 - hsv.saturation);
+
+        switch (i)
+        {
+            case 0:
+                red = hsv.value;
+                green = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
+                blue = p;
+                break;
+
+            case 1:
+                red = hsv.value * (1.0 - hsv.saturation * f);
+                green = hsv.value;
+                blue = p;
+                break;
+
+            case 2:
+                red = p;
+                green = hsv.value;
+                blue = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
+                break;
+
+            case 3:
+                red = p;
+                green = hsv.value * (1.0 - hsv.saturation * f);
+                blue = hsv.value;
+                break;
+
+            case 4:
+                red = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
+                green = p;
+                blue = hsv.value;
+                break;
+
+            default:    // case 5:
+                red = hsv.value;
+                green = p;
+                blue = hsv.value * (1.0 - hsv.saturation * f);
+                break;
+        }
+    }
+
+    return RGBValue((unsigned char)(red * 255.0),
+                    (unsigned char)(green * 255.0),
+                    (unsigned char)(blue * 255.0));
+}
+
+/*
+ * Rotates the hue of each pixel of the image. angle is a double in the range
+ * -1.0..1.0 where -1.0 is -360 degrees and 1.0 is 360 degrees
+ */
+void wxImage::RotateHue(double angle)
+{
+    AllocExclusive();
+
+    unsigned char *srcBytePtr;
+    unsigned char *dstBytePtr;
+    unsigned long count;
+    wxImage::HSVValue hsv;
+    wxImage::RGBValue rgb;
+
+    wxASSERT (angle >= -1.0 && angle <= 1.0);
+    count = M_IMGDATA->m_width * M_IMGDATA->m_height;
+    if ( count > 0 && !wxIsNullDouble(angle) )
+    {
+        srcBytePtr = M_IMGDATA->m_data;
+        dstBytePtr = srcBytePtr;
+        do
+        {
+            rgb.red = *srcBytePtr++;
+            rgb.green = *srcBytePtr++;
+            rgb.blue = *srcBytePtr++;
+            hsv = RGBtoHSV(rgb);
+
+            hsv.hue = hsv.hue + angle;
+            if (hsv.hue > 1.0)
+                hsv.hue = hsv.hue - 1.0;
+            else if (hsv.hue < 0.0)
+                hsv.hue = hsv.hue + 1.0;
+
+            rgb = HSVtoRGB(hsv);
+            *dstBytePtr++ = rgb.red;
+            *dstBytePtr++ = rgb.green;
+            *dstBytePtr++ = rgb.blue;
+        } while (--count != 0);
+    }
+}
+
 //-----------------------------------------------------------------------------
 // wxImageHandler
 //-----------------------------------------------------------------------------
@@ -1543,7 +2617,7 @@ bool wxImageHandler::CanRead( const wxString& name )
 {
     if (wxFileExists(name))
     {
-        wxFileInputStream stream(name);
+        wxImageFileInputStream stream(name);
         return CanRead(stream);
     }
 
@@ -1776,20 +2850,20 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
 
-    int x1 = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
-    int y1 = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
-    int x2 = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
-    int y2 = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
+    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)));
+    int x2a = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
+    int y2a = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
 
     // Create rotated image
-    wxImage rotated (x2 - x1 + 1, y2 - y1 + 1, false);
+    wxImage rotated (x2a - x1a + 1, y2a - y1a + 1, false);
     // With alpha channel
     if (has_alpha)
         rotated.SetAlpha();
 
     if (offset_after_rotation != NULL)
     {
-        *offset_after_rotation = wxPoint (x1, y1);
+        *offset_after_rotation = wxPoint (x1a, y1a);
     }
 
     // GRG: The rotated (destination) image is always accessed
@@ -1831,7 +2905,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
         {
             for (x = 0; x < rotated.GetWidth(); x++)
             {
-                wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
+                wxRealPoint src = rotated_point (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)
@@ -1839,8 +2913,6 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
                     // interpolate using the 4 enclosing grid-points.  Those
                     // points can be obtained using floor and ceiling of the
                     // exact coordinates of the point
-                        // C.M. 2000-02-17:  when the point is near the border, special care is required.
-
                     int x1, y1, x2, y2;
 
                     if (0 < src.x && src.x < GetWidth() - 1)
@@ -1890,10 +2962,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
                         *(dst++) = *p;
 
                         if (has_alpha)
-                        {
-                            unsigned char *p = alpha[y1] + x1;
-                            *(alpha_dst++) = *p;
-                        }
+                            *(alpha_dst++) = *(alpha[y1] + x1);
                     }
                     else if (d2 < gs_Epsilon)
                     {
@@ -1903,10 +2972,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
                         *(dst++) = *p;
 
                         if (has_alpha)
-                        {
-                            unsigned char *p = alpha[y1] + x2;
-                            *(alpha_dst++) = *p;
-                        }
+                            *(alpha_dst++) = *(alpha[y1] + x2);
                     }
                     else if (d3 < gs_Epsilon)
                     {
@@ -1916,10 +2982,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
                         *(dst++) = *p;
 
                         if (has_alpha)
-                        {
-                            unsigned char *p = alpha[y2] + x2;
-                            *(alpha_dst++) = *p;
-                        }
+                            *(alpha_dst++) = *(alpha[y2] + x2);
                     }
                     else if (d4 < gs_Epsilon)
                     {
@@ -1929,10 +2992,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
                         *(dst++) = *p;
 
                         if (has_alpha)
-                        {
-                            unsigned char *p = alpha[y2] + x1;
-                            *(alpha_dst++) = *p;
-                        }
+                            *(alpha_dst++) = *(alpha[y2] + x1);
                     }
                     else
                     {
@@ -1961,10 +3021,10 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
 
                         if (has_alpha)
                         {
-                            unsigned char *v1 = alpha[y1] + (x1);
-                            unsigned char *v2 = alpha[y1] + (x2);
-                            unsigned char *v3 = alpha[y2] + (x2);
-                            unsigned char *v4 = alpha[y2] + (x1);
+                            v1 = alpha[y1] + (x1);
+                            v2 = alpha[y1] + (x2);
+                            v3 = alpha[y2] + (x2);
+                            v4 = alpha[y2] + (x1);
 
                             *(alpha_dst++) = (unsigned char)
                                 ( (w1 * *v1 + w2 * *v2 +
@@ -1991,7 +3051,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
         {
             for (x = 0; x < rotated.GetWidth(); x++)
             {
-                wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
+                wxRealPoint src = rotated_point (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
@@ -2005,10 +3065,7 @@ wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool i
                     *(dst++) = *p;
 
                     if (has_alpha)
-                    {
-                        unsigned char *p = alpha[ys] + (xs);
-                        *(alpha_dst++) = *p;
-                    }
+                        *(alpha_dst++) = *(alpha[ys] + (xs));
                 }
                 else
                 {