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alpha support for Scale added

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@32137 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Stefan Csomor 2005-02-18 07:14:07 +00:00
parent 71699da48d
commit 8d3b6b8aa1
1 changed files with 19 additions and 4 deletions
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23
src/common/image.cpp
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@ -394,15 +394,26 @@ wxImage wxImage::Scale( int width, int height ) const
wxCHECK_MSG( data, image, wxT("unable to create image") );
unsigned char *source_data = M_IMGDATA->m_data;
unsigned char *target_data = data;
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 );
}
unsigned char *source_data = M_IMGDATA->m_data;
unsigned char *target_data = data;
else
{
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;
@ -413,15 +424,19 @@ wxImage wxImage::Scale( int width, int height ) const
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 ;
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;
}