[cairo] OpenType fonts in Windows Metafiles

[Zoltán Turányi]

Hi,

I am writing an OLE server application. Such applications need to provide an
old format Windows Metafile (and not an Enhanced Metafile) to container
applications. I attempted to create a printing surface passing on the DC for
a Windows Metafile, but got an out-of memory error. I deducted that cairo
does not support Metafile surfaces.

Then I created an Enhanced Metafile and passed the resulting DC to
cairo_win32_create_printing_surface and I was able to draw. Next, I wanted
to convert the resulting metafile to a an old format Windows Metafile using
the code below, but text simply disappears, if I use an OpenType font.
However, if I use the "Courier" font it shows.

            unsigned size = GetWinMetaFileBits(hemf, 0, NULL,
MM_ANISOTROPIC, pDC->m_hDC);
            BYTE *buff = (BYTE*)malloc(size);
            size = GetWinMetaFileBits(hemf, size, buff, MM_ANISOTROPIC,
pDC->m_hDC);
            HMETAFILE hwmf = SetMetaFileBitsEx(size, buff);

I attached two emf files showing the drawing and the resulting wmf files
that does/does not have the text in them. (Note that wmf files have a
thumbnail bitmap stored with them, which shows the text, but if you drop the
wmf onto a PowerPointslide, it misses the text.)

The funny thing is that both the emf and the wmf file contain the relevant
textout records, but I cannot figure out why it never shows with
TrueType/OpenType fonts in the wmf file. I have tried it both on Vista and
XP.

Can anyone give me a hint what may go wrong here, or how else to produce an
old format Windows Metafile with Cairo?

Zoltan
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