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Add wxImage::Rotate180() function.

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Closes #12679.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66146 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2010-11-14 01:02:35 +00:00
parent 000c2be40d
commit 8524dec372
4 changed files with 65 additions and 0 deletions
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56
src/common/image.cpp
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@@ -1128,6 +1128,62 @@ wxImage wxImage::Rotate90( bool clockwise ) const
return image;
}
wxImage wxImage::Rotate180() const
{
wxImage image;
wxCHECK_MSG( Ok(), image, wxS("invalid image") );
image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
unsigned char *data = image.GetData();
unsigned char *alpha = NULL;
wxCHECK_MSG( data, image, wxS("unable to create image") );
if ( M_IMGDATA->m_alpha != NULL )
{
image.SetAlpha();
alpha = image.GetAlpha();
wxCHECK_MSG( alpha, image, wxS("unable to create alpha channel") );
}
if ( M_IMGDATA->m_hasMask )
image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
long height = M_IMGDATA->m_height;
long width = M_IMGDATA->m_width;
const unsigned char *source_data = M_IMGDATA->m_data;
unsigned char *target_data = data + width * height * 3;
for (long j = 0; j < height; j++)
{
for (long i = 0; i < width; i++)
{
target_data -= 3;
memcpy( target_data, source_data, 3 );
source_data += 3;
}
}
if ( alpha )
{
const unsigned char *src_alpha = M_IMGDATA->m_alpha;
unsigned char *dest_alpha = alpha + width * height;
for (long j = 0; j < height; ++j)
{
for (long i = 0; i < width; ++i)
{
*(--dest_alpha) = *(src_alpha++);
}
}
}
return image;
}
wxImage wxImage::Mirror( bool horizontally ) const
{
wxImage image;