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TransparentBLT in GDI+
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John Lutz
Jun 19, 2008, 11:27:01 AM6/19/08
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App: C++/MFC
Problem: I'm starting with a HBITMAP. I would like to use GDI+ to do a
nice looking stretch and also need to draw the bitmap with a "transparent"
color so stuff underneath shows through.
Problem: I'm starting with a HBITMAP. I would like to use GDI+ to do a
nice looking stretch and also need to draw the bitmap with a "transparent"
color so stuff underneath shows through.
DrawImage handles the stretching although it's extremely slow compared to
StretchBlt.
1) How can I speed DrawImage up?
2) How can I specify a transparent color?
Thanks,
John
Michael Phillips, Jr.
Jun 20, 2008, 8:45:11 AM6/20/08
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> Problem: I'm starting with a HBITMAP. I would like to use GDI+ to do a
> nice looking stretch and also need to draw the bitmap with a "transparent"
> color so stuff underneath shows through.
> nice looking stretch and also need to draw the bitmap with a "transparent"
> color so stuff underneath shows through.
> 2) How can I specify a transparent color?
Use ImageAttributes::SetColorKey. See MSDN:
http://msdn.microsoft.com/en-us/library/ms535429(VS.85).aspx
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