[cairo] Equivalence of text_path(); fill(); and show_text()

Behdad Esfahbod behdad at behdad.org
Mon Oct 1 11:30:27 PDT 2007

On Thu, 2007-09-27 at 11:23 -0400, Carl Worth wrote:
> On Thu, 27 Sep 2007 15:54:25 +0100, Chris Wilson wrote:
> > It is my understanding that
> >     cairo_show_text (cr, "cairo");
> > and
> >     cairo_text_path (cr, "cairo");
> >     cairo_fill (cr);
> > should generate identical output.
> Not precisely identical, no---just roughly the same.
> What happens in the text_path;fill case should be pretty
> straightforward, (cairo fills the path). But in the show_text case
> there are the following differences (at least):
>   * Freetype is used for rendering the glyphs, (this is something that
>     we could easily imagine changing in the future---particularly if
>     we get a new software polygon rasterizer that's as fast or faster
>     than what freetype has).
>   * Glyph images are cached and reused

There's another major difference, that is: subpixel rendering.  You
cannot get the effect of subpixel show_text() with the path.


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        -- Benjamin Franklin, 1759

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