[cairo] pango_cairo_layout_path and hinting

[Arjen Nienhuis]

Hi,

In theory pango_cairo_show_layout() does all sorts of speed
optimizations that ...path()+cairo_fill() does not. I believe
...show_layout() can do sub-pixel (LCD) stuff where cairo_fill can
not. I think all glyphs are (sub?)pixel-aligned with ...show_layout().

In practice ...show_layout() is faster while ...fill() looks 'nicer'.
'nice' does not mean more readable. Especially with a very small font
size (thumbnails) the line spacing is 'wrong' with ...show_layout().
3.5 pixel line spacing gets rounded to 3 or 4 every other line.

I'm not sure if it's possible to change the font settings to make
show_layout() behave like ...fill().

Met vriendelijke groet,
Arjen Nienhuis

On Sat, Jun 12, 2010 at 1:10 AM, Behdad Esfahbod <behdad at behdad.org> wrote:
> On 06/11/2010 03:09 AM, Lutz Gehlen wrote:
>
>> However, I was wondering how the hinting for glyph rasterization is
>> affected by this process. After converting the text to a path, is
>> hinting performed at all? The question boils down to: Does
>>
>> pango_cairo_layout_path(cr, layout);
>> cairo_fill(cr);
>>
>> give the same result as
>>
>> pango_cairo_show_layout(cr, layout);?
>
> It's supposed to give the same result, yes.  How good that actually works is
> another question.  Let us know.
>
> behdad
>
>
>> Thanks for your help
>> Lutz
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>>
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