Bug 83 - Offset for bitmap images
Summary: Offset for bitmap images
Alias: None
Product: xorg
Classification: Unclassified
Component: Lib/Xft (show other bugs)
Version: unspecified
Hardware: x86 (IA32) Linux (All)
: high normal
Assignee: Keith Packard
QA Contact:
Depends on:
Reported: 2003-05-01 15:31 UTC by Owen Taylor
Modified: 2011-10-15 17:14 UTC (History)
0 users

See Also:
i915 platform:
i915 features:


Description Owen Taylor 2003-05-01 15:31:08 UTC
Nalin reported to me a problem where with .pcf fonts, Xft
was rendering characters always at the left side of the
character cell, instead of at their proper X position.

Looking into it some, the problem seems to be that the
ft_glyph_format_bitmap case in XftFontLoadGlyphs() doesn't take in
slot->bitmap_left into account.

Fixing up the antialiased case is trivial; the non-antialiased case
will need some bitmap shifting code.

(I no longer have a reference to what fonts in particular were triggering
the problem, unfortunately.)
Comment 1 Keith Packard 2003-05-01 15:36:22 UTC
I think this will be trivial to fix by adjusting the x/y value in the glyph
metrics, but I'll need a test case that currently fails before I can commit a fix.
Comment 2 Owen Taylor 2003-05-01 16:45:59 UTC
OK, doing some research it turns out that as long as there is a
particular relationship between the glyph metrics and the returned
bitmap that holds for current freetype drivers, things work.

The observed bug earlier was the result of a bug in the PCF driver
where slot->metrics.horiBearingX was set to an incorrect value.

Comment 3 Keith Packard 2003-05-01 17:26:34 UTC
Looks like this is related to bugs that Juliusz Chroboczek found in FreeType2
and which have already been fixed there.

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