[whatwg] Enabling LCD Text and antialiasing in canvas

Mark Callow callow.mark at artspark.co.jp
Wed Apr 3 21:25:10 PDT 2013

On 2013/04/04 10:08, Rik Cabanier wrote:
> On Wed, Apr 3, 2013 at 5:21 PM, Gregg Tavares <gman at google.com> wrote:
>> O RLY?   So you're saying the following 250pt ampersand is stored as a
>> bitmap in the font file?
>>  &
> It's not simply stored as a path that you then scale. In some fonts it
> might be in a completely different format than a path (or it could even be
> a bitmap)
As screen pixel densities soar, it is increasingly the case that fonts
are stored simply as paths that are scaled, especially fonts which have
thousands of characters.
> Fonts render different from paths. If your UA doesn't do that, you are
> doing it wrong. :-)
> Line art looks different to the human eye than a line of text. Imagina a
> vertical and a horizontal line rendered with sub-pixel AA; they will look
> very different.
Vertical and horizontal lines won't have any aliasing to begin with so
what are you talking about?
> Text also has the nice property that it's filled with a solid color.
I know little about Canvas2D but I do know that PostScript and SVG both
support gradients etc. when filling text so your statement is wrong.



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