Bug 798843 - Add README for generating fonts for SVG in OpenType reftests r=dbaron

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Edwin Flores 2013-09-13 07:08:56 +01:00
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Fonts in this directory:
.woff files for SVG-in-OpenType testing
=======================================
rubbish.woff contains an SVG table with the contents of rubbish.txt. This is
not a valid SVG table so no SVG glyphs will be used.
There are three .woff files in this directory:
* nosvg.woff
* svg.woff
* rubbish.woff
nosvg.woff is derived from the "Liberation" font. It contains no SVG table.
nosvg.woff
----------
This font is Liberation Serif with the addition of a glyph with a UVS selector
(Liberation fonts do not come with UVS glyphs; one had to be added to test that
SVG glyphs work with UVS selectors). It contains no 'SVG ' table.
svg.woff is nosvg.woff with an SVG table added. The
table contains the glyph documents glyphs-base.svg, glyphs-invalid.svg,
glyphs-objectcolor.svg, glyphs-objectopacity.svg, glyphs-objectstroke.svg,
glyphs-paintservers.svg and glyphs-transforms.svg.
svg.woff
--------
This font is the same as nosvg.woff above, but with the glyphs-*.svg SVG
documents from this directory embedded in it using the tools described below.
rubbish.woff
------------
This font is the same as nosvg.woff above, but with the addition of an 'SVG '
table with the contents of rubbish.txt. Its purpose is to test that SVG tables
without valid XML are ignored.
Creating the Fonts
------------------
The tools used here are insertsvg.py from [1] and sfnt2woff from [2].
svg.woff can be recreated with:
woff2sfnt nosvg.woff > nosvg.ttf
insertsvg.py nosvg.ttf svg.ttf glyphs-*.svg
sfnt2woff svg.ttf
[1] https://github.com/edf825/SVG-OpenType-Utils
[2] http://people.mozilla.com/~jkew/woff/