X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/921c65ed3d889117c600387cebb0bce2470cff8e..3c3b35589a13813433617be9d212fdc768246938:/src/common/image.cpp

diff --git a/src/common/image.cpp b/src/common/image.cpp
index cf35689226..9defc7b068 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"
 
@@ -18,35 +14,31 @@
     #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/app.h"
+    #include "wx/hash.h"
+    #include "wx/utils.h"
+    #include "wx/bitmap.h"
+    #include "wx/math.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"
 
 #if wxUSE_XPM
-#include "wx/xpmdecod.h"
+    #include "wx/xpmdecod.h"
 #endif
 
 // For memcpy
 #include <string.h>
 
-#ifdef __SALFORDC__
-    #undef FAR
-#endif
-
-
 //-----------------------------------------------------------------------------
 // wxImage
 //-----------------------------------------------------------------------------
@@ -116,7 +108,7 @@ wxImage wxNullImage;
 
 //-----------------------------------------------------------------------------
 
-#define M_IMGDATA ((wxImageRefData *)m_refData)
+#define M_IMGDATA wx_static_cast(wxImageRefData*, m_refData)
 
 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
 
@@ -157,17 +149,6 @@ wxImage::wxImage( wxInputStream& stream, const wxString& mimetype, int index )
 }
 #endif // wxUSE_STREAMS
 
-wxImage::wxImage( const wxImage& image )
-    : wxObject()
-{
-    Ref(image);
-}
-
-wxImage::wxImage( const wxImage* image )
-{
-    if (image) Ref(*image);
-}
-
 wxImage::wxImage( const char** xpmData )
 {
     Create(xpmData);
@@ -254,27 +235,48 @@ 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;
 }
@@ -282,7 +284,7 @@ wxImage wxImage::Copy() const
 wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
 {
     if( xFactor == 1 && yFactor == 1 )
-        return Copy() ;
+        return *this;
 
     wxImage image;
 
@@ -389,7 +391,7 @@ 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);
@@ -475,7 +477,7 @@ wxImage wxImage::Scale( int width, int height ) const
         y += y_delta;
     }
 
-    // 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);
@@ -560,9 +562,16 @@ 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 );
 
@@ -585,6 +594,25 @@ 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
     {
@@ -594,6 +622,23 @@ 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;
@@ -605,32 +650,47 @@ 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;
@@ -660,6 +720,10 @@ wxImage wxImage::Size( const wxSize& size, const wxPoint& pos,
 
     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);
 
@@ -679,6 +743,8 @@ 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();
@@ -760,6 +826,8 @@ 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();
@@ -778,6 +846,56 @@ 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;
@@ -846,6 +964,8 @@ 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;
@@ -857,6 +977,8 @@ 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() )
@@ -995,6 +1117,8 @@ 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;
 }
 
@@ -1037,6 +1161,8 @@ 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);
@@ -1098,6 +1224,8 @@ 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;
@@ -1147,6 +1275,8 @@ void wxImage::SetMask( bool mask )
 {
     wxCHECK_RET( Ok(), wxT("invalid image") );
 
+    AllocExclusive();
+
     M_IMGDATA->m_hasMask = mask;
 }
 
@@ -1206,6 +1336,8 @@ bool wxImage::SetMaskFromImage(const wxImage& mask,
         return false ;
     }
 
+    AllocExclusive();
+
     unsigned char *imgdata = GetData();
     unsigned char *maskdata = mask.GetData();
 
@@ -1245,6 +1377,8 @@ bool wxImage::ConvertAlphaToMask(unsigned char threshold)
         return false;
     }
 
+    AllocExclusive();
+
     SetMask(true);
     SetMaskColour(mr, mg, mb);
 
@@ -1298,6 +1432,8 @@ void wxImage::SetPalette(const wxPalette& palette)
 {
     wxCHECK_RET( Ok(), wxT("invalid image") );
 
+    AllocExclusive();
+
     M_IMGDATA->m_palette = palette;
 }
 
@@ -1311,6 +1447,8 @@ 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)
     {
@@ -1358,7 +1496,9 @@ bool wxImage::HasOption(const wxString& name) const
 // image I/O
 // ----------------------------------------------------------------------------
 
-bool wxImage::LoadFile( const wxString& filename, long type, int index )
+bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
+                        long WXUNUSED_UNLESS_STREAMS(type),
+                        int WXUNUSED_UNLESS_STREAMS(index) )
 {
 #if wxUSE_STREAMS
     if (wxFileExists(filename))
@@ -1378,7 +1518,9 @@ bool wxImage::LoadFile( const wxString& filename, long type, int index )
 #endif // wxUSE_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 (wxFileExists(filename))
@@ -1416,7 +1558,8 @@ 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
     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
@@ -1435,7 +1578,8 @@ bool wxImage::SaveFile( const wxString& filename, int type ) const
     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
     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
@@ -1454,22 +1598,23 @@ bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype ) con
     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);
+    wxFileInputStream 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);
+    wxFileInputStream stream(name);
+    if (stream.Ok())
+        return GetImageCount(stream, type);
 #endif
 
   return 0;
@@ -1563,7 +1708,13 @@ bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
         return false;
     }
 
-    return handler->LoadFile(this, stream, true/*verbose*/, index);
+    if (stream.IsSeekable() && !handler->CanRead(stream))
+    {
+        wxLogError(_("Image file is not of type %d."), type);
+        return false;
+    }
+    else
+        return handler->LoadFile(this, stream, true/*verbose*/, index);
 }
 
 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
@@ -1581,7 +1732,13 @@ 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
@@ -1758,6 +1915,179 @@ 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
 //-----------------------------------------------------------------------------
@@ -2017,20 +2347,20 @@ 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
@@ -2072,7 +2402,7 @@ 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)
@@ -2080,8 +2410,6 @@ 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)
@@ -2131,10 +2459,7 @@ 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)
                     {
@@ -2144,10 +2469,7 @@ 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)
                     {
@@ -2157,10 +2479,7 @@ 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)
                     {
@@ -2170,10 +2489,7 @@ 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
                     {
@@ -2202,10 +2518,10 @@ 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 +
@@ -2232,7 +2548,7 @@ 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
@@ -2246,10 +2562,7 @@ 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
                 {