Re: [cairo] Color fonts

From: Behdad Esfahbod <behdad behdad org>
To: Matthias Clasen <matthias clasen gmail com>
Cc: Uli Schlachter <psychon znc in>, Matthias Clasen <mclasen redhat com>, cairo <cairo cairographics org>, "Gtk+ Developers" <gtk-devel-list gnome org>, Parag Nemade <pnemade redhat com>, Christian Hergert <christian hergert me>
Subject: Re: [cairo] Color fonts
Date: Tue, 11 Jul 2017 20:45:35 +0430

On Fri, Jul 7, 2017 at 5:53 PM, Matthias Clasen <matthias clasen gmail com> wrote:

On Sat, Jul 1, 2017 at 2:25 AM, Uli Schlachter <psychon znc in> wrote:

Okay... so what is the new model? What happens when I draw a color glyph
with operator XOR and a red source?

The red source is ignored for color glyphs because they are used as the source.

Note that while with Google's (CBDT/CBLC) and Apple's (sbix) color font formats the red source will be ignored, with the Microsoft (COLR/CPAL) and Adobe's (SVG/CPAL) the font can have color imaging as well as using the current foreground color. So, the glyph image won't be just a source either. It will be a mix of source and mask... Right now those two formats are not implemented in FreeType though.

behdad
http://behdad.org/

References:
- Re: [cairo] Color fonts
  - From: Matthias Clasen

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