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shrinking functions added

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@19474 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Stefan Csomor
2003-03-04 12:06:05 +00:00
parent 5872b92e95
commit 3c969e8f7a
1 changed files with 104 additions and 0 deletions
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104
src/common/image.cpp
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@@ -207,6 +207,105 @@ wxImage wxImage::Copy() const
return image; return image;
} }
wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
{
if( xFactor == 1 && yFactor == 1 )
return Copy() ;
wxImage image;
wxCHECK_MSG( Ok(), image, wxT("invalid image") );
// can't scale to/from 0 size
wxCHECK_MSG( (xFactor > 0) && (yFactor > 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") );
long width = old_width / xFactor ;
long height = old_height / yFactor ;
image.Create( width , height );
char unsigned *data = image.GetData();
wxCHECK_MSG( data, image, wxT("unable to create image") );
bool hasMask = false ;
unsigned char maskRed = 0;
unsigned char maskGreen = 0;
unsigned char maskBlue =0 ;
if (M_IMGDATA->m_hasMask)
{
hasMask = true ;
maskRed = M_IMGDATA->m_maskRed;
maskGreen = M_IMGDATA->m_maskGreen;
maskBlue =M_IMGDATA->m_maskBlue ;
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 y = 0; y < height; y++)
{
for (long x = 0; x < width; x++)
{
unsigned long avgRed = 0 ;
unsigned long avgGreen = 0;
unsigned long avgBlue = 0;
unsigned long counter = 0 ;
// determine average
for ( int y1 = 0 ; y1 < yFactor ; ++y1 )
{
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 ) ;
unsigned char red = pixel[0] ;
unsigned char green = pixel[1] ;
unsigned char blue = pixel[2] ;
if ( !hasMask || red != maskRed || green != maskGreen || blue != maskBlue )
{
avgRed += red ;
avgGreen += green ;
avgBlue += blue ;
counter++ ;
}
}
}
if ( counter == 0 )
{
*(target_data++) = M_IMGDATA->m_maskRed ;
*(target_data++) = M_IMGDATA->m_maskGreen ;
*(target_data++) = M_IMGDATA->m_maskBlue ;
}
else
{
*(target_data++) = avgRed / counter ;
*(target_data++) = avgGreen / counter ;
*(target_data++) = avgBlue / counter ;
}
}
}
// In case this is a cursor, make sure the hotspot is scalled accordingly:
if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
(GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X))/xFactor);
if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
(GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y))/yFactor);
return image;
}
wxImage wxImage::Scale( int width, int height ) const wxImage wxImage::Scale( int width, int height ) const
{ {
wxImage image; wxImage image;
@@ -222,6 +321,11 @@ wxImage wxImage::Scale( int width, int height ) const
wxCHECK_MSG( (old_height > 0) && (old_width > 0), image, wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
wxT("invalid old image size") ); wxT("invalid old image size") );
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 ); image.Create( width, height );
char unsigned *data = image.GetData(); char unsigned *data = image.GetData();