Amebis/wxWidgets
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Fix to preserve alpha channel in Rotate90

Browse Source 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@34240 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Julian Smart
2005-05-22 11:33:00 +00:00
parent 4bcfcdef85
commit 921c65ed3d
1 changed files with 31 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
src/common/image.cpp
View File

@@ -498,25 +498,53 @@ wxImage wxImage::Rotate90( bool clockwise ) const
wxCHECK_MSG( data, image, wxT("unable to create image") );
unsigned char *source_data = M_IMGDATA->m_data;
unsigned char *target_data;
unsigned char *alpha_data = 0 ;
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 );
}
else
{
source_alpha = M_IMGDATA->m_alpha ;
if ( source_alpha )
{
image.SetAlpha() ;
alpha_data = image.GetAlpha() ;
}
}
long height = M_IMGDATA->m_height;
long width = M_IMGDATA->m_width;
unsigned char *source_data = M_IMGDATA->m_data;
unsigned char *target_data;
for (long j = 0; j < height; j++)
{
for (long i = 0; i < width; i++)
{
if (clockwise)
{
target_data = data + (((i+1)*height) - j - 1)*3;
if(source_alpha)
target_alpha = alpha_data + (((i+1)*height) - j - 1);
}
else
{
target_data = data + ((height*(width-1)) + j - (i*height))*3;
if(source_alpha)
target_alpha = alpha_data + ((height*(width-1)) + j - (i*height));
}
memcpy( target_data, source_data, 3 );
source_data += 3;
if(source_alpha)
{
memcpy( target_alpha, source_alpha, 1 );
source_alpha += 1;
}
}
}