[cairo] Pango + cairo

[Owen Taylor]

On Tue, 2005-03-15 at 10:55 -0500, Owen Taylor wrote:
> On Tue, 2005-03-15 at 07:42 -0800, Keith Packard wrote:
> > > I'm not sure I understand the problem ... if you use the same layout
> > > and change the CTM, then you need to call pango_cairo_update_layout().
> > > Pango can't know that the CTM changed. (*)
> > 
> > I create the layout after the matrix is set, and, not knowing how the API
> > works, I also called pango_cairo_update_layout after selecting the font
> > size. 
> 
> The first should be sufficient... basically pango_cairo_update_layout()
> just copies the CTM from the context into the layout's PangoContext,
> and then when real layout happens, that CTM is used.
> 
> Can you figure out a modification of pango/examples/cairosimple.c that
> reproduces your problem?

This is now fixed in CVS; was various bugs in the font caching code.

2005-03-15  Owen Taylor  <otaylor at redhat.com>

        * pango/pangofc-fontmap.c: Include the effect of the
        CTM in the FC_PIXEL_SIZE we set in the FcPattern.
        (Fixes problems with getting the wrong font when drawing
        the same font at multiple scales. Reported by Keith
        Packard.)

        * pango/pangofc-fontmap.h pango/pangocairo-fcfontmap.c
        pango/pangocairo-fc.h pango/pangocairo-fontfont.c: Add
        the PangoFontDescription to create_font() ... we need it
        to get the right pixel size to combine with the CTM.

        * pango/pangofc-fontmap.c (pango_fc_fontmap_get_dpi):
        Extract out the logic for finding the DPI from the
        size-listing code.
        (pango_fc_font_map_get_render_key): Handle mix of
        absolute and not sizes correctly.

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