merged MapBitmap() from 2.2 branch

[wxWidgets.git] / src / common / image.cpp

diff --git a/src/common/image.cpp b/src/common/image.cpp
index a798ea580b2b5d10dc54d283d7eb1d3d985f137e..5086141878f886a24d990458bd6db1dea9b28239 100644 (file)
--- a/src/common/image.cpp
+++ b/src/common/image.cpp
@@ -28,7 +28,6 @@
 #include "wx/log.h"
 #include "wx/app.h"
 #include "wx/filefn.h"
-#include "wx/filesys.h"
 #include "wx/wfstream.h"
 #include "wx/intl.h"
 #include "wx/module.h"
@@ -211,7 +210,14 @@ wxImage wxImage::Scale( int width, int height ) const
 
     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 
-    wxCHECK_MSG( (width > 0) && (height > 0), image, wxT("invalid image size") );
+    // can't scale to/from 0 size
+    wxCHECK_MSG( (width > 0) && (height > 0), image,
+                 wxT("invalid new image size") );
+
+    long old_height = M_IMGDATA->m_height,
+         old_width  = M_IMGDATA->m_width;
+    wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
+                 wxT("invalid old image size") );
 
     image.Create( width, height );
 
@@ -220,23 +226,32 @@ wxImage wxImage::Scale( int width, int height ) const
     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 );
-
-    long old_height = M_IMGDATA->m_height;
-    long old_width  = M_IMGDATA->m_width;
+    {
+        image.SetMaskColour( M_IMGDATA->m_maskRed,
+                             M_IMGDATA->m_maskGreen,
+                             M_IMGDATA->m_maskBlue );
+    }
 
     char unsigned *source_data = M_IMGDATA->m_data;
     char unsigned *target_data = data;
 
-    for (long j = 0; j < height; j++)
+    // We do (x, y) -> (x, y)*oldSize/newSize but the valid values of x and y
+    // are from 0 to size-1, hence all decrement the sizes
+    long old_old_width = old_width;
+    old_height--;
+    old_width--;
+    height--;
+    width--;
+    for ( long j = 0; j <= height; j++ )
     {
-        long y_offset = (j * (old_height-1) / (height-1)) * old_width;
+        // don't crash for images with height == 1
+        long y_offset = height ? (j * old_height / height)* old_old_width : 0;
 
-        for (long i = 0; i < width; i++)
+        for ( long i = 0; i <= width; i++ )
         {
-            memcpy( target_data,
-                source_data + 3*(y_offset + ((i * (old_width-1) )/ (width-1))),
-                3 );
+            long x_offset = width ? (i * old_width) / width : 0;
+
+            memcpy( target_data, source_data + 3*(y_offset + x_offset), 3 );
             target_data += 3;
         }
     }
@@ -763,22 +778,18 @@ bool wxImage::HasOption(const wxString& name) const
 bool wxImage::LoadFile( const wxString& filename, long type )
 {
 #if wxUSE_STREAMS
-    // We want to use wxFileSystem for virtual FS compatibility
-    wxFileSystem fsys;
-    wxFSFile *file = fsys.OpenFile(filename);
-    if (!file)
+    if (wxFileExists(filename))
     {
-        wxLogError(_("Can't open file '%s'"), filename.c_str());
-        return FALSE;
+        wxFileInputStream stream(filename);
+        wxBufferedInputStream bstream( stream );
+        return LoadFile(bstream, type);
     }
-    wxInputStream *stream = file->GetStream();
-    if (!stream)
+    else
     {
-        wxLogError(_("Can't open stream for file '%s'"), filename.c_str());
+        wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
+
         return FALSE;
     }
-
-    return LoadFile(*stream, type);
 #else // !wxUSE_STREAMS
     return FALSE;
 #endif // wxUSE_STREAMS
@@ -787,21 +798,18 @@ bool wxImage::LoadFile( const wxString& filename, long type )
 bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype )
 {
 #if wxUSE_STREAMS
-    // We want to use wxFileSystem for virtual FS compatibility
-    wxFileSystem fsys;
-    wxFSFile *file = fsys.OpenFile(filename);
-    if (!file)
+    if (wxFileExists(filename))
     {
-        wxLogError(_("Can't open file '%s'"), filename.c_str());
-        return FALSE;
+        wxFileInputStream stream(filename);
+        wxBufferedInputStream bstream( stream );
+        return LoadFile(bstream, mimetype);
     }
-    wxInputStream *stream = file->GetStream();
-    if (!stream)
+    else
     {
-        wxLogError(_("Can't open stream for file '%s'"), filename.c_str());
+        wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
+
         return FALSE;
     }
-    return LoadFile(*stream, mimetype);
 #else // !wxUSE_STREAMS
     return FALSE;
 #endif // wxUSE_STREAMS
@@ -1032,7 +1040,7 @@ wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
 void wxImage::InitStandardHandlers()
 {
     AddHandler(new wxBMPHandler);
-#if !defined(__WXGTK__) && !defined(__WXMOTIF__)
+#if wxUSE_XPM && !defined(__WXGTK__) && !defined(__WXMOTIF__)
     AddHandler(new wxXPMHandler);
 #endif
 }
@@ -1152,7 +1160,7 @@ unsigned long wxImage::CountColours( unsigned long stopafter )
     wxHashTable h;
     wxObject dummy;
     unsigned char r, g, b;
-    unsigned char *p;
+       unsigned char *p;
     unsigned long size, nentries, key;
 
     p = GetData();
@@ -1187,7 +1195,7 @@ unsigned long wxImage::CountColours( unsigned long stopafter )
 unsigned long wxImage::ComputeHistogram( wxHashTable &h )
 {
     unsigned char r, g, b;
-    unsigned char *p;
+       unsigned char *p;
     unsigned long size, nentries, key;
     wxHNode *hnode;