X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/496dbbe76e6bc7b36c30494b81bec05f49fc2d06..cc2aecdef579e57f84eaa07cc72f62a43fc474ba:/src/common/image.cpp?ds=sidebyside

diff --git a/src/common/image.cpp b/src/common/image.cpp
index d8dd6a0d45..62597542fd 100644
--- a/src/common/image.cpp
+++ b/src/common/image.cpp
@@ -29,7 +29,6 @@
     #include "wx/colour.h"
 #endif
 
-#include "wx/filefn.h"
 #include "wx/wfstream.h"
 #include "wx/xpmdecod.h"
 
@@ -141,8 +140,9 @@ bool wxImage::Create(const char* const* xpmData)
 
     wxXPMDecoder decoder;
     (*this) = decoder.ReadData(xpmData);
-    return Ok();
+    return IsOk();
 #else
+    wxUnusedVar(xpmData);
     return false;
 #endif
 }
@@ -259,7 +259,7 @@ wxImage wxImage::MakeEmptyClone(int flags) const
 {
     wxImage image;
 
-    wxCHECK_MSG( Ok(), image, wxS("invalid image") );
+    wxCHECK_MSG( IsOk(), image, wxS("invalid image") );
 
     long height = M_IMGDATA->m_height;
     long width  = M_IMGDATA->m_width;
@@ -294,7 +294,7 @@ wxImage wxImage::Copy() const
 {
     wxImage image;
 
-    wxCHECK_MSG( Ok(), image, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), image, wxT("invalid image") );
 
     image.m_refData = CloneRefData(m_refData);
 
@@ -308,7 +308,7 @@ wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
 
     wxImage image;
 
-    wxCHECK_MSG( Ok(), image, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), image, wxT("invalid image") );
 
     // can't scale to/from 0 size
     wxCHECK_MSG( (xFactor > 0) && (yFactor > 0), image,
@@ -332,11 +332,11 @@ wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
     bool hasMask = false ;
     unsigned char maskRed = 0;
     unsigned char maskGreen = 0;
-    unsigned char maskBlue =0 ;
+    unsigned char maskBlue = 0 ;
 
-    unsigned char *source_data = M_IMGDATA->m_data;
+    const unsigned char *source_data = M_IMGDATA->m_data;
     unsigned char *target_data = data;
-    unsigned char *source_alpha = 0 ;
+    const unsigned char *source_alpha = 0 ;
     unsigned char *target_alpha = 0 ;
     if (M_IMGDATA->m_hasMask)
     {
@@ -374,7 +374,7 @@ wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
                 long y_offset = (y * yFactor + y1) * old_width;
                 for ( int x1 = 0 ; x1 < xFactor ; ++x1 )
                 {
-                    unsigned char *pixel = source_data + 3 * ( y_offset + x * xFactor + x1 ) ;
+                    const unsigned char *pixel = source_data + 3 * ( y_offset + x * xFactor + x1 ) ;
                     unsigned char red = pixel[0] ;
                     unsigned char green = pixel[1] ;
                     unsigned char blue = pixel[2] ;
@@ -427,7 +427,7 @@ wxImage::Scale( int width, int height, wxImageResizeQuality quality ) const
 {
     wxImage image;
 
-    wxCHECK_MSG( Ok(), image, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), image, wxT("invalid image") );
 
     // can't scale to/from 0 size
     wxCHECK_MSG( (width > 0) && (height > 0), image,
@@ -443,23 +443,16 @@ wxImage::Scale( int width, int height, wxImageResizeQuality quality ) const
     if ( old_width == width && old_height == height )
         return *this;
 
-    // resample the image using either the nearest neighbourhood, bilinear or
-    // bicubic method as specified
-    switch ( quality )
+    if (quality == wxIMAGE_QUALITY_HIGH)
     {
-        case wxIMAGE_QUALITY_BICUBIC:
-        case wxIMAGE_QUALITY_BILINEAR:
-            // both of these algorithms should be used for up-sampling the
-            // image only, when down-sampling always use box averaging for best
-            // results
-            if ( width < old_width && height < old_height )
-                image = ResampleBox(width, height);
-            else if ( quality == wxIMAGE_QUALITY_BILINEAR )
-                image = ResampleBilinear(width, height);
-            else if ( quality == wxIMAGE_QUALITY_BICUBIC )
-                image = ResampleBicubic(width, height);
-            break;
+        quality = (width < old_width && height < old_height)
+            ? wxIMAGE_QUALITY_BOX_AVERAGE
+            : wxIMAGE_QUALITY_BICUBIC;
+    }
 
+    // Resample the image using the method as specified.
+    switch ( quality )
+    {
         case wxIMAGE_QUALITY_NEAREST:
             if ( old_width % width == 0 && old_width >= width &&
                 old_height % height == 0 && old_height >= height )
@@ -469,6 +462,18 @@ wxImage::Scale( int width, int height, wxImageResizeQuality quality ) const
 
             image = ResampleNearest(width, height);
             break;
+
+        case wxIMAGE_QUALITY_BILINEAR:
+            image = ResampleBilinear(width, height);
+            break;
+
+        case wxIMAGE_QUALITY_BICUBIC:
+            image = ResampleBicubic(width, height);
+            break;
+
+        case wxIMAGE_QUALITY_BOX_AVERAGE:
+            image = ResampleBox(width, height);
+            break;
     }
 
     // If the original image has a mask, apply the mask to the new image
@@ -499,9 +504,9 @@ wxImage wxImage::ResampleNearest(int width, int height) const
 
     wxCHECK_MSG( data, image, wxT("unable to create image") );
 
-    unsigned char *source_data = M_IMGDATA->m_data;
+    const unsigned char *source_data = M_IMGDATA->m_data;
     unsigned char *target_data = data;
-    unsigned char *source_alpha = 0 ;
+    const unsigned char *source_alpha = 0 ;
     unsigned char *target_alpha = 0 ;
 
     if ( !M_IMGDATA->m_hasMask )
@@ -524,14 +529,14 @@ wxImage wxImage::ResampleNearest(int width, int height) const
     long y = 0;
     for ( long j = 0; j < height; j++ )
     {
-        unsigned char* src_line = &source_data[(y>>16)*old_width*3];
-        unsigned char* src_alpha_line = source_alpha ? &source_alpha[(y>>16)*old_width] : 0 ;
+        const unsigned char* src_line = &source_data[(y>>16)*old_width*3];
+        const unsigned char* src_alpha_line = source_alpha ? &source_alpha[(y>>16)*old_width] : 0 ;
 
         long x = 0;
         for ( long i = 0; i < width; i++ )
         {
-            unsigned char* src_pixel = &src_line[(x>>16)*3];
-            unsigned char* src_alpha_pixel = source_alpha ? &src_alpha_line[(x>>16)] : 0 ;
+            const unsigned char* src_pixel = &src_line[(x>>16)*3];
+            const 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];
@@ -562,8 +567,8 @@ wxImage wxImage::ResampleBox(int width, int height) const
     const int scale_factor_x_2 = (int)(scale_factor_x / 2);
     const int scale_factor_y_2 = (int)(scale_factor_y / 2);
 
-    unsigned char* src_data = M_IMGDATA->m_data;
-    unsigned char* src_alpha = M_IMGDATA->m_alpha;
+    const unsigned char* src_data = M_IMGDATA->m_data;
+    const unsigned char* src_alpha = M_IMGDATA->m_alpha;
     unsigned char* dst_data = ret_image.GetData();
     unsigned char* dst_alpha = NULL;
 
@@ -590,16 +595,16 @@ wxImage wxImage::ResampleBox(int width, int height) const
             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);
+            for ( int j = int(src_y - scale_factor_y/2.0 + 1), k = j;
+                  j <= int(src_y + scale_factor_y_2) || j < k + 2;
                   j++ )
             {
                 // We don't care to average pixels that don't exist (edges)
                 if ( j < 0 || j > M_IMGDATA->m_height - 1 )
                     continue;
 
-                for ( int i = int(src_x - scale_factor_x/2.0 + 1);
-                      i <= src_x + scale_factor_x_2;
+                for ( int i = int(src_x - scale_factor_x/2.0 + 1), e = i;
+                      i <= src_x + scale_factor_x_2 || i < e + 2;
                       i++ )
                 {
                     // Don't average edge pixels
@@ -636,8 +641,8 @@ wxImage wxImage::ResampleBilinear(int width, int height) const
 {
     // This function implements a Bilinear algorithm for resampling.
     wxImage ret_image(width, height, false);
-    unsigned char* src_data = M_IMGDATA->m_data;
-    unsigned char* src_alpha = M_IMGDATA->m_alpha;
+    const unsigned char* src_data = M_IMGDATA->m_data;
+    const unsigned char* src_alpha = M_IMGDATA->m_alpha;
     unsigned char* dst_data = ret_image.GetData();
     unsigned char* dst_alpha = NULL;
 
@@ -689,21 +694,21 @@ wxImage wxImage::ResampleBilinear(int width, int height) const
             int src_pixel_index10 = y_offset2 * M_IMGDATA->m_width + x_offset1;
             int src_pixel_index11 = y_offset2 * M_IMGDATA->m_width + x_offset2;
 
-            //first line
+            // first line
             r1 = src_data[src_pixel_index00 * 3 + 0] * dx1 + src_data[src_pixel_index01 * 3 + 0] * dx;
             g1 = src_data[src_pixel_index00 * 3 + 1] * dx1 + src_data[src_pixel_index01 * 3 + 1] * dx;
             b1 = src_data[src_pixel_index00 * 3 + 2] * dx1 + src_data[src_pixel_index01 * 3 + 2] * dx;
             if ( src_alpha )
                 a1 = src_alpha[src_pixel_index00] * dx1 + src_alpha[src_pixel_index01] * dx;
 
-            //second line
+            // second line
             r2 = src_data[src_pixel_index10 * 3 + 0] * dx1 + src_data[src_pixel_index11 * 3 + 0] * dx;
             g2 = src_data[src_pixel_index10 * 3 + 1] * dx1 + src_data[src_pixel_index11 * 3 + 1] * dx;
             b2 = src_data[src_pixel_index10 * 3 + 2] * dx1 + src_data[src_pixel_index11 * 3 + 2] * dx;
             if ( src_alpha )
                 a2 = src_alpha[src_pixel_index10] * dx1 + src_alpha[src_pixel_index11] * dx;
 
-            //result lines
+            // result lines
 
             dst_data[0] = static_cast<unsigned char>(r1 * dy1 + r2 * dy);
             dst_data[1] = static_cast<unsigned char>(g1 * dy1 + g2 * dy);
@@ -766,8 +771,8 @@ wxImage wxImage::ResampleBicubic(int width, int height) const
 
     ret_image.Create(width, height, false);
 
-    unsigned char* src_data = M_IMGDATA->m_data;
-    unsigned char* src_alpha = M_IMGDATA->m_alpha;
+    const unsigned char* src_data = M_IMGDATA->m_data;
+    const unsigned char* src_alpha = M_IMGDATA->m_alpha;
     unsigned char* dst_data = ret_image.GetData();
     unsigned char* dst_alpha = NULL;
 
@@ -852,7 +857,7 @@ wxImage wxImage::BlurHorizontal(int blurRadius) const
 {
     wxImage ret_image(MakeEmptyClone());
 
-    wxCHECK( ret_image.Ok(), ret_image );
+    wxCHECK( ret_image.IsOk(), ret_image );
 
     const unsigned char* src_data = M_IMGDATA->m_data;
     unsigned char* dst_data = ret_image.GetData();
@@ -955,7 +960,7 @@ wxImage wxImage::BlurVertical(int blurRadius) const
 {
     wxImage ret_image(MakeEmptyClone());
 
-    wxCHECK( ret_image.Ok(), ret_image );
+    wxCHECK( ret_image.IsOk(), ret_image );
 
     const unsigned char* src_data = M_IMGDATA->m_data;
     unsigned char* dst_data = ret_image.GetData();
@@ -1070,7 +1075,7 @@ wxImage wxImage::Rotate90( bool clockwise ) const
 {
     wxImage image(MakeEmptyClone(Clone_SwapOrientation));
 
-    wxCHECK( image.Ok(), image );
+    wxCHECK( image.IsOk(), image );
 
     long height = M_IMGDATA->m_height;
     long width  = M_IMGDATA->m_width;
@@ -1090,36 +1095,70 @@ wxImage wxImage::Rotate90( bool clockwise ) const
     }
 
     unsigned char *data = image.GetData();
-    const unsigned char *source_data = M_IMGDATA->m_data;
     unsigned char *target_data;
-    unsigned char *alpha_data = image.GetAlpha();
-    const unsigned char *source_alpha = M_IMGDATA->m_alpha;
-    unsigned char *target_alpha = 0 ;
 
-    for (long j = 0; j < height; j++)
+    // we rotate the image in 21-pixel (63-byte) wide strips
+    // to make better use of cpu cache - memory transfers
+    // (note: while much better than single-pixel "strips",
+    //  our vertical strips will still generally straddle 64-byte cachelines)
+    for (long ii = 0; ii < width; )
     {
-        for (long i = 0; i < width; i++)
+        long next_ii = wxMin(ii + 21, width);
+
+        for (long j = 0; j < height; j++)
         {
-            if (clockwise)
-            {
-                target_data = data + (((i+1)*height) - j - 1)*3;
-                if(source_alpha)
-                    target_alpha = alpha_data + (((i+1)*height) - j - 1);
-            }
-            else
+            const unsigned char *source_data
+                                     = M_IMGDATA->m_data + (j*width + ii)*3;
+
+            for (long i = ii; i < next_ii; i++)
             {
-                target_data = data + ((height*(width-1)) + j - (i*height))*3;
-                if(source_alpha)
-                    target_alpha = alpha_data + ((height*(width-1)) + j - (i*height));
+                if ( clockwise )
+                {
+                    target_data = data + ((i + 1)*height - j - 1)*3;
+                }
+                else
+                {
+                    target_data = data + (height*(width - 1 - i) + j)*3;
+                }
+                memcpy( target_data, source_data, 3 );
+                source_data += 3;
             }
-            memcpy( target_data, source_data, 3 );
-            source_data += 3;
+        }
+
+        ii = next_ii;
+    }
+
+    const unsigned char *source_alpha = M_IMGDATA->m_alpha;
+
+    if ( source_alpha )
+    {
+        unsigned char *alpha_data = image.GetAlpha();
+        unsigned char *target_alpha = 0 ;
+
+        for (long ii = 0; ii < width; )
+        {
+            long next_ii = wxMin(ii + 64, width);
 
-            if(source_alpha)
+            for (long j = 0; j < height; j++)
             {
-                memcpy( target_alpha, source_alpha, 1 );
-                source_alpha += 1;
+                source_alpha = M_IMGDATA->m_alpha + j*width + ii;
+
+                for (long i = ii; i < next_ii; i++)
+                {
+                    if ( clockwise )
+                    {
+                        target_alpha = alpha_data + (i+1)*height - j - 1;
+                    }
+                    else
+                    {
+                        target_alpha = alpha_data + height*(width - i - 1) + j;
+                    }
+
+                    *target_alpha = *source_alpha++;
+                }
             }
+
+            ii = next_ii;
         }
     }
 
@@ -1128,9 +1167,9 @@ wxImage wxImage::Rotate90( bool clockwise ) const
 
 wxImage wxImage::Rotate180() const
 {
-    wxImage image( MakeEmptyClone( false ));
+    wxImage image(MakeEmptyClone());
 
-    wxCHECK( image.Ok(), image );
+    wxCHECK( image.IsOk(), image );
 
     long height = M_IMGDATA->m_height;
     long width  = M_IMGDATA->m_width;
@@ -1181,9 +1220,9 @@ wxImage wxImage::Rotate180() const
 
 wxImage wxImage::Mirror( bool horizontally ) const
 {
-    wxImage image( MakeEmptyClone( false ));
+    wxImage image(MakeEmptyClone());
 
-    wxCHECK( image.Ok(), image );
+    wxCHECK( image.IsOk(), image );
 
     long height = M_IMGDATA->m_height;
     long width  = M_IMGDATA->m_width;
@@ -1235,7 +1274,7 @@ wxImage wxImage::Mirror( bool horizontally ) const
             source_data += 3*width;
         }
 
-        if (alpha != NULL)
+        if ( alpha )
         {
             // 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)
@@ -1260,7 +1299,7 @@ wxImage wxImage::GetSubImage( const wxRect &rect ) const
 {
     wxImage image;
 
-    wxCHECK_MSG( Ok(), image, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), image, wxT("invalid image") );
 
     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) &&
                  (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
@@ -1278,7 +1317,7 @@ wxImage wxImage::GetSubImage( const wxRect &rect ) const
 
     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
 
-    if (src_alpha != NULL) {
+    if ( src_alpha ) {
         image.SetAlpha();
         subalpha = image.GetAlpha();
         wxCHECK_MSG( subalpha, image, wxT("unable to create alpha channel"));
@@ -1313,7 +1352,7 @@ wxImage wxImage::Size( const wxSize& size, const wxPoint& pos,
 {
     wxImage image;
 
-    wxCHECK_MSG( Ok(), image, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), image, wxT("invalid image") );
     wxCHECK_MSG( (size.GetWidth() > 0) && (size.GetHeight() > 0), image, wxT("invalid size") );
 
     int width = GetWidth(), height = GetHeight();
@@ -1361,8 +1400,8 @@ wxImage wxImage::Size( const wxSize& size, const wxPoint& pos,
 
 void wxImage::Paste( const wxImage &image, int x, int y )
 {
-    wxCHECK_RET( Ok(), wxT("invalid image") );
-    wxCHECK_RET( image.Ok(), wxT("invalid image") );
+    wxCHECK_RET( IsOk(), wxT("invalid image") );
+    wxCHECK_RET( image.IsOk(), wxT("invalid image") );
 
     AllocExclusive();
 
@@ -1390,17 +1429,20 @@ void wxImage::Paste( const wxImage &image, int x, int y )
     if (width < 1) return;
     if (height < 1) return;
 
-    if ((!HasMask() && !image.HasMask()) ||
-        (HasMask() && !image.HasMask()) ||
-       ((HasMask() && image.HasMask() &&
+    // If we can, copy the data using memcpy() as this is the fastest way. But
+    // for this  the image being pasted must have "compatible" mask with this
+    // one meaning that either it must not have one at all or it must use the
+    // same masked colour.
+    if ( !image.HasMask() ||
+        ((HasMask() &&
          (GetMaskRed()==image.GetMaskRed()) &&
          (GetMaskGreen()==image.GetMaskGreen()) &&
-         (GetMaskBlue()==image.GetMaskBlue()))))
+         (GetMaskBlue()==image.GetMaskBlue()))) )
     {
-        unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
+        const unsigned char* source_data = image.GetData() + 3*(xx + yy*image.GetWidth());
         int source_step = image.GetWidth()*3;
 
-        unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
+        unsigned char* target_data = GetData() + 3*((x+xx) + (y+yy)*M_IMGDATA->m_width);
         int target_step = M_IMGDATA->m_width*3;
         for (int j = 0; j < height; j++)
         {
@@ -1416,7 +1458,7 @@ void wxImage::Paste( const wxImage &image, int x, int y )
         if ( !HasAlpha() )
             InitAlpha();
 
-        unsigned char* source_data = image.GetAlpha() + xx + yy*image.GetWidth();
+        const unsigned char* source_data = image.GetAlpha() + xx + yy*image.GetWidth();
         int source_step = image.GetWidth();
 
         unsigned char* target_data = GetAlpha() + (x+xx) + (y+yy)*M_IMGDATA->m_width;
@@ -1436,10 +1478,10 @@ void wxImage::Paste( const wxImage &image, int x, int y )
         unsigned char g = image.GetMaskGreen();
         unsigned char b = image.GetMaskBlue();
 
-        unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
+        const unsigned char* source_data = image.GetData() + 3*(xx + yy*image.GetWidth());
         int source_step = image.GetWidth()*3;
 
-        unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
+        unsigned char* target_data = GetData() + 3*((x+xx) + (y+yy)*M_IMGDATA->m_width);
         int target_step = M_IMGDATA->m_width*3;
 
         for (int j = 0; j < height; j++)
@@ -1462,7 +1504,7 @@ void wxImage::Paste( const wxImage &image, int x, int y )
 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
                        unsigned char r2, unsigned char g2, unsigned char b2 )
 {
-    wxCHECK_RET( Ok(), wxT("invalid image") );
+    wxCHECK_RET( IsOk(), wxT("invalid image") );
 
     AllocExclusive();
 
@@ -1491,27 +1533,24 @@ wxImage wxImage::ConvertToGreyscale(void) const
 
 wxImage wxImage::ConvertToGreyscale(double weight_r, double weight_g, double weight_b) const
 {
-    wxImage image( MakeEmptyClone( false ));
+    wxImage image(MakeEmptyClone());
 
-    wxCHECK( image.Ok(), image );
+    wxCHECK( image.IsOk(), image );
 
     const unsigned char *src = M_IMGDATA->m_data;
     unsigned char *dest = image.GetData();
 
-    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;
+    const bool hasMask = M_IMGDATA->m_hasMask;
+    const unsigned char maskRed = M_IMGDATA->m_maskRed;
+    const unsigned char maskGreen = M_IMGDATA->m_maskGreen;
+    const unsigned char maskBlue = M_IMGDATA->m_maskBlue;
 
     const long size = M_IMGDATA->m_width * M_IMGDATA->m_height;
     for ( long i = 0; i < size; i++, src += 3, dest += 3 )
     {
         memcpy(dest, src, 3);
-        // don't modify the mask
-        if ( hasMask && src[0] == maskRed && src[1] == maskGreen && src[2] == maskBlue )
-        {
-        }
-        else
+        // only modify non-masked pixels
+        if ( !hasMask || src[0] != maskRed || src[1] != maskGreen || src[2] != maskBlue )
         {
             wxColour::MakeGrey(dest + 0, dest + 1, dest + 2, weight_r, weight_g, weight_b);
         }
@@ -1530,7 +1569,7 @@ wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char
 {
     wxImage image;
 
-    wxCHECK_MSG( Ok(), image, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), image, wxT("invalid image") );
 
     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 
@@ -1593,14 +1632,14 @@ wxImage wxImage::ConvertToDisabled(unsigned char brightness) const
 
 int wxImage::GetWidth() const
 {
-    wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), 0, wxT("invalid image") );
 
     return M_IMGDATA->m_width;
 }
 
 int wxImage::GetHeight() const
 {
-    wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), 0, wxT("invalid image") );
 
     return M_IMGDATA->m_height;
 }
@@ -1624,7 +1663,7 @@ void wxImage::SetType(wxBitmapType type)
 
 long wxImage::XYToIndex(int x, int y) const
 {
-    if ( Ok() &&
+    if ( IsOk() &&
             x >= 0 && y >= 0 &&
                 x < M_IMGDATA->m_width && y < M_IMGDATA->m_height )
     {
@@ -1650,7 +1689,7 @@ void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned c
 
 void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, unsigned char b )
 {
-    wxCHECK_RET( Ok(), wxT("invalid image") );
+    wxCHECK_RET( IsOk(), wxT("invalid image") );
 
     AllocExclusive();
 
@@ -1726,14 +1765,14 @@ bool wxImage::IsOk() const
 
 unsigned char *wxImage::GetData() const
 {
-    wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), (unsigned char *)NULL, wxT("invalid image") );
 
     return M_IMGDATA->m_data;
 }
 
 void wxImage::SetData( unsigned char *data, bool static_data  )
 {
-    wxCHECK_RET( Ok(), wxT("invalid image") );
+    wxCHECK_RET( IsOk(), wxT("invalid image") );
 
     wxImageRefData *newRefData = new wxImageRefData();
 
@@ -1834,7 +1873,7 @@ wxImage::ConvertColourToAlpha(unsigned char r, unsigned char g, unsigned char b)
 
 void wxImage::SetAlpha( unsigned char *alpha, bool static_data )
 {
-    wxCHECK_RET( Ok(), wxT("invalid image") );
+    wxCHECK_RET( IsOk(), wxT("invalid image") );
 
     AllocExclusive();
 
@@ -1852,7 +1891,7 @@ void wxImage::SetAlpha( unsigned char *alpha, bool static_data )
 
 unsigned char *wxImage::GetAlpha() const
 {
-    wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), (unsigned char *)NULL, wxT("invalid image") );
 
     return M_IMGDATA->m_alpha;
 }
@@ -1910,7 +1949,7 @@ void wxImage::ClearAlpha()
 
 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
 {
-    wxCHECK_RET( Ok(), wxT("invalid image") );
+    wxCHECK_RET( IsOk(), wxT("invalid image") );
 
     AllocExclusive();
 
@@ -1922,7 +1961,7 @@ void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
 
 bool wxImage::GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const
 {
-    wxCHECK_MSG( Ok(), false, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), false, wxT("invalid image") );
 
     if (M_IMGDATA->m_hasMask)
     {
@@ -1940,28 +1979,28 @@ bool wxImage::GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned
 
 unsigned char wxImage::GetMaskRed() const
 {
-    wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), 0, wxT("invalid image") );
 
     return M_IMGDATA->m_maskRed;
 }
 
 unsigned char wxImage::GetMaskGreen() const
 {
-    wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), 0, wxT("invalid image") );
 
     return M_IMGDATA->m_maskGreen;
 }
 
 unsigned char wxImage::GetMaskBlue() const
 {
-    wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), 0, wxT("invalid image") );
 
     return M_IMGDATA->m_maskBlue;
 }
 
 void wxImage::SetMask( bool mask )
 {
-    wxCHECK_RET( Ok(), wxT("invalid image") );
+    wxCHECK_RET( IsOk(), wxT("invalid image") );
 
     AllocExclusive();
 
@@ -1970,7 +2009,7 @@ void wxImage::SetMask( bool mask )
 
 bool wxImage::HasMask() const
 {
-    wxCHECK_MSG( Ok(), false, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), false, wxT("invalid image") );
 
     return M_IMGDATA->m_hasMask;
 }
@@ -2117,22 +2156,22 @@ bool wxImage::ConvertAlphaToMask(unsigned char mr,
 
 bool wxImage::HasPalette() const
 {
-    if (!Ok())
+    if (!IsOk())
         return false;
 
-    return M_IMGDATA->m_palette.Ok();
+    return M_IMGDATA->m_palette.IsOk();
 }
 
 const wxPalette& wxImage::GetPalette() const
 {
-    wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), wxNullPalette, wxT("invalid image") );
 
     return M_IMGDATA->m_palette;
 }
 
 void wxImage::SetPalette(const wxPalette& palette)
 {
-    wxCHECK_RET( Ok(), wxT("invalid image") );
+    wxCHECK_RET( IsOk(), wxT("invalid image") );
 
     AllocExclusive();
 
@@ -2201,21 +2240,18 @@ bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
                         int WXUNUSED_UNLESS_STREAMS(index) )
 {
 #if HAS_FILE_STREAMS
-    if (wxFileExists(filename))
+    wxImageFileInputStream stream(filename);
+    if ( stream.IsOk() )
     {
-        wxImageFileInputStream stream(filename);
         wxBufferedInputStream bstream( stream );
-        return LoadFile(bstream, type, index);
+        if ( LoadFile(bstream, type, index) )
+            return true;
     }
-    else
-    {
-        wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
 
-        return false;
-    }
-#else // !HAS_FILE_STREAMS
-    return false;
+    wxLogError(_("Failed to load image from file \"%s\"."), filename);
 #endif // HAS_FILE_STREAMS
+
+    return false;
 }
 
 bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
@@ -2223,21 +2259,18 @@ bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
                         int WXUNUSED_UNLESS_STREAMS(index) )
 {
 #if HAS_FILE_STREAMS
-    if (wxFileExists(filename))
+    wxImageFileInputStream stream(filename);
+    if ( stream.IsOk() )
     {
-        wxImageFileInputStream stream(filename);
         wxBufferedInputStream bstream( stream );
-        return LoadFile(bstream, mimetype, index);
+        if ( LoadFile(bstream, mimetype, index) )
+            return true;
     }
-    else
-    {
-        wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
 
-        return false;
-    }
-#else // !HAS_FILE_STREAMS
-    return false;
+    wxLogError(_("Failed to load image from file \"%s\"."), filename);
 #endif // HAS_FILE_STREAMS
+
+    return false;
 }
 
 
@@ -2260,7 +2293,7 @@ bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
                         wxBitmapType WXUNUSED_UNLESS_STREAMS(type) ) const
 {
 #if HAS_FILE_STREAMS
-    wxCHECK_MSG( Ok(), false, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), false, wxT("invalid image") );
 
     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
 
@@ -2280,7 +2313,7 @@ bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
                         const wxString& WXUNUSED_UNLESS_STREAMS(mimetype) ) const
 {
 #if HAS_FILE_STREAMS
-    wxCHECK_MSG( Ok(), false, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), false, wxT("invalid image") );
 
     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
 
@@ -2311,7 +2344,7 @@ int wxImage::GetImageCount( const wxString& WXUNUSED_UNLESS_STREAMS(name),
 {
 #if HAS_FILE_STREAMS
     wxImageFileInputStream stream(name);
-    if (stream.Ok())
+    if (stream.IsOk())
         return GetImageCount(stream, type);
 #endif
 
@@ -2386,8 +2419,20 @@ bool wxImage::DoLoad(wxImageHandler& handler, wxInputStream& stream, int index)
     const unsigned maxWidth = GetOptionInt(wxIMAGE_OPTION_MAX_WIDTH),
                    maxHeight = GetOptionInt(wxIMAGE_OPTION_MAX_HEIGHT);
 
+    // Preserve the original stream position if possible to rewind back to it
+    // if we failed to load the file -- maybe the next handler that we try can
+    // succeed after us then.
+    wxFileOffset posOld = wxInvalidOffset;
+    if ( stream.IsSeekable() )
+        posOld = stream.TellI();
+
     if ( !handler.LoadFile(this, stream, true/*verbose*/, index) )
+    {
+        if ( posOld != wxInvalidOffset )
+            stream.SeekI(posOld);
+
         return false;
+    }
 
     // rescale the image to the specified size if needed
     if ( maxWidth || maxHeight )
@@ -2406,7 +2451,17 @@ bool wxImage::DoLoad(wxImageHandler& handler, wxInputStream& stream, int index)
         }
 
         if ( width != widthOrig || height != heightOrig )
+        {
+            // get the original size if it was set by the image handler
+            // but also in order to restore it after Rescale
+            int widthOrigOption = GetOptionInt(wxIMAGE_OPTION_ORIGINAL_WIDTH),
+                heightOrigOption = GetOptionInt(wxIMAGE_OPTION_ORIGINAL_HEIGHT);
+
             Rescale(width, height, wxIMAGE_QUALITY_HIGH);
+
+            SetOption(wxIMAGE_OPTION_ORIGINAL_WIDTH, widthOrigOption ? widthOrigOption : widthOrig);
+            SetOption(wxIMAGE_OPTION_ORIGINAL_HEIGHT, heightOrigOption ? heightOrigOption : heightOrig);
+        }
     }
 
     // Set this after Rescale, which currently does not preserve it
@@ -2423,6 +2478,17 @@ bool wxImage::LoadFile( wxInputStream& stream, wxBitmapType type, int index )
 
     if ( type == wxBITMAP_TYPE_ANY )
     {
+        if ( !stream.IsSeekable() )
+        {
+            // The error message about image data format being unknown below
+            // would be misleading in this case as we are not even going to try
+            // any handlers because CanRead() never does anything for not
+            // seekable stream, so try to be more precise here.
+            wxLogError(_("Can't automatically determine the image format "
+                         "for non-seekable input."));
+            return false;
+        }
+
         const wxList& list = GetHandlers();
         for ( wxList::compatibility_iterator node = list.GetFirst();
               node;
@@ -2433,7 +2499,7 @@ bool wxImage::LoadFile( wxInputStream& stream, wxBitmapType type, int index )
                  return true;
         }
 
-        wxLogWarning( _("No handler found for image type.") );
+        wxLogWarning( _("Unknown image data format.") );
 
         return false;
     }
@@ -2448,7 +2514,7 @@ bool wxImage::LoadFile( wxInputStream& stream, wxBitmapType type, int index )
 
     if ( stream.IsSeekable() && !handler->CanRead(stream) )
     {
-        wxLogError(_("Image file is not of type %d."), type);
+        wxLogError(_("This is not a %s."), handler->GetName());
         return false;
     }
 
@@ -2471,7 +2537,7 @@ bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int ind
 
     if ( stream.IsSeekable() && !handler->CanRead(stream) )
     {
-        wxLogError(_("Image file is not of type %s."), mimetype);
+        wxLogError(_("Image is not of type %s."), mimetype);
         return false;
     }
 
@@ -2490,7 +2556,7 @@ bool wxImage::DoSave(wxImageHandler& handler, wxOutputStream& stream) const
 
 bool wxImage::SaveFile( wxOutputStream& stream, wxBitmapType type ) const
 {
-    wxCHECK_MSG( Ok(), false, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), false, wxT("invalid image") );
 
     wxImageHandler *handler = FindHandler(type);
     if ( !handler )
@@ -2504,7 +2570,7 @@ bool wxImage::SaveFile( wxOutputStream& stream, wxBitmapType type ) const
 
 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
 {
-    wxCHECK_MSG( Ok(), false, wxT("invalid image") );
+    wxCHECK_MSG( IsOk(), false, wxT("invalid image") );
 
     wxImageHandler *handler = FindHandlerMime(mimetype);
     if ( !handler )
@@ -2871,15 +2937,15 @@ int wxImageHandler::GetImageCount( wxInputStream& stream )
 
 bool wxImageHandler::CanRead( const wxString& name )
 {
-    if (wxFileExists(name))
+    wxImageFileInputStream stream(name);
+    if ( !stream.IsOk() )
     {
-        wxImageFileInputStream stream(name);
-        return CanRead(stream);
-    }
+        wxLogError(_("Failed to check format of image file \"%s\"."), name);
 
-    wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
+        return false;
+    }
 
-    return false;
+    return CanRead(stream);
 }
 
 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)