[whatwg] Enabling LCD Text and antialiasing in canvas

Mark Callow callow.mark at artspark.co.jp
Wed Apr 3 22:02:14 PDT 2013

On 2013/04/04 13:50, Rik Cabanier wrote:
> On Wed, Apr 3, 2013 at 9:25 PM, Mark Callow
> <callow.mark at artspark.co.jp <mailto:callow.mark at artspark.co.jp>> wrote:
>     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.
> No, that is not true.
> Talk to font vendors; fonts are not just a collection of path
> segments. They are also not rendered as paths; instead they should
> have specific renderers.
The people who work on our HiGlyph library tell me it is changing. I
have no references I can provide.
>     Vertical and horizontal lines won't have any aliasing to begin
>     with so what are you talking about?
> Of course they have aliasing.  Why wouldn't they?
Because they are vertical and horizontal, therefore no jaggies (aliasing).
>>     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.
> I worked on the rendering engine of Illustrator and Acrobat for 11
> years. Subpixel AA is disabled for text that is filled with gradients
> or images and reverts to normal rendering. AFAIK there is no
> postscript implementation that supports subpixel positioning.
> Can you point me to a spec where you can fill text in canvas with a
> gradient instead of a solid color?
As I wrote, I don't know much about Canvas2D. Besides it wasn't clear
that your comment referred only to Canvas2D. 



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