[cairo] Re: Drawing text with Windows bitmap fonts
stuartp at gmail.com
Tue Jan 23 00:22:31 PST 2007
So the main problem with bitmap fonts in cairo is
WIN32_FONT_LOGICAL_SCALE (in cairo-win32-private.h) being 32. This
will break all bitmap fonts since we'll always ask for much larger
fonts than you really want. In Mozilla we change this to 1 without
any real problems. You may want to give this a shot. We can probably
just remove all the logical scale code but we avoid going through the
cairo-win32-font code mostly so I'm not sure if it breaks paths we
Try changing it to 1 and see if it works for you!
On 1/22/07, Jan Slupski <jslupski at gmail.com> wrote:
> Jan Slupski wrote:
> > Stuart Parmenter wrote:
> > > Has anyone gotten win32 bitmap fonts to render using cairo? I'm using
> > > cairo_show_glyphs() with glyph indexes I've gotten from Uniscribe.
> > > Things fall apart in _cairo_win32_scaled_font_init_glyph_metrics in
> > > cairo-win32-font.c when it tries to do GetGlyphOutlineW(). According
> > > to the MSDN docs, using GGO_GLYPH_INDEX means that it is a true type
> > > index, which I'm not sure if bitmap fonts really respect.
> > > GetGlyphOutlineW ends up failing... I could be going down the wrong
> > > path here.. was wondering if anyone else had done more digging or had
> > > any suggestions.
> > Indeed, it seems that support for bitmap fonts is somewhat broken.
> > I am trying to open Windows font called "Small Fonts" (smalle.fon).
> > As stated above, cairo is using _scaled_* functions to operate
> > on that font that seems to be wrong by definition.
> > This ends up on querying the font with GetGlyphOutlineW that
> > by MSDN definition "The GetGlyphOutline function retrieves the outline
> > or bitmap for a character in the *TrueType* font".
> > I think cairo should either properly support windows bitmap fonts
> > (ignoring font size & rotation?), or fail in more meaningful way. It
> > could be either return of an error by cairo's API call, or fallback to a
> > default font in the same way as when unknown font name is passed.
> Hi again,
> I have opened a bug report for that issue at:
> Also I have proposed a (temporary?) workaround that forces Windows to
> choose closes matching font from among TrueType fonts only.
> CreateFontIndirect parameter OUT_TT_ONLY_PRECIS: Instructs the font
> mapper to choose from only TrueType fonts. If there are no TrueType
> fonts installed in the system, the font mapper returns to default behavior.
> All the best,
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