[cairo] Text scaling and hinting

Mike Emmel mike.emmel at gmail.com
Wed May 4 12:30:56 PDT 2005

Java2D has the concept of the font or glyphs affine transform and the
graphics transform. Not sure if the helps but just pointing it out.

On 5/4/05, Robert O'Callahan <rocallahan at gmail.com> wrote:
> I'm currently working on having Mozilla draw text through the new Cairo font
> APIs (the text in my blog screenshot was a hack based on Xft). The new Cairo
> font APIs have all metrics depending on the current transformation matrix
> because of hinting effects. That's fine, but we also need the ability to get
> a cairo_scaled_font_t and render those exact outlines under other
> transformation matrices.
>  One obvious use case is animated rotation/scaling of a multi-line text
> object. If we allow the metrics to change during the animation, lines might
> break in different places during the animation, which is probably not what
> the author wants. Performance would also suffer because we'd have to run our
> layout algorithm at each and every step of the animation. Alternatively, we
> could just cross our fingers, hope that the metrics don't change much, and
> don't rerun the layout algorithm --- but that will lead to glyphs
> overlapping at the boundaries of text runs, and other ugliness.
>  What do you think?
>  Rob
> -- 
> ["Therefore, my dear friends, as you have always obeyed–not only in my
> presence, but now much more in my absence–continue to work out your
> salvation with fear and trembling, for it is God who works in you to will 
> and to act according to his good purpose." Philippians 2:12-13.] 
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