https://bugs.documentfoundation.org/show_bug.cgi?id=104403
Bug ID: 104403
Summary: Support multi-colored fonts using COLR/CPAL tables
Product: LibreOffice
Version: unspecified
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: graphics stack
Assignee: [email protected]
Reporter: [email protected]
Description:
The latest version of the OpenType specification introduced few tables that
allow for having multi-colored glyphs.
The simplest of them is COLR/CPAL
(https://www.microsoft.com/typography/otspec/colr.htm,
https://www.microsoft.com/typography/otspec/cpal.htm) which uses layers of
normal glyphs and color palettes to assign colors to each.
It shouldn’s be hard to parse the tables in SalGraphics::DrawTextLayout() and
draw each layer glyph with its assigned color. We might want to wait until
HarfBuzz supports these fonts to avoid parsing the tables on our own.
This would allow supporting fonts like Amiri Quran Colored or several of the
new Emoji fonts cross-platform (Windows 8.1+ already supports this format,
though I don’t think we make use of that support).
Steps to Reproduce:
Try using Amiri Quran Colored font with Arabic text.
Actual Results:
Text comes out using the foreground color.
Expected Results:
Text should use the colors defined in the font.
Reproducible: Always
User Profile Reset:
Additional Info:
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:50.0) Gecko/20100101
Firefox/50.0
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