GSUB (and GPOS?) bloated

[GoogleCodeExporter]

As I reported here:
https://github.com/adobe-fonts/source-han-sans/issues/46



I see multiple copies of the same features. Eg:

  <FeatureRecord index="0"> 
    <FeatureTag value="aalt"/> 
    <Feature> 
      <!-- LookupCount=2 --> 
      <LookupListIndex index="0" value="0"/> 
      <LookupListIndex index="1" value="1"/> 
    </Feature> 
  </FeatureRecord> 
  <FeatureRecord index="1"> 
    <FeatureTag value="aalt"/> 
    <Feature> 
      <!-- LookupCount=2 --> 
      <LookupListIndex index="0" value="0"/> 
      <LookupListIndex index="1" value="1"/> 
    </Feature> 
  </FeatureRecord> 
  <FeatureRecord index="2"> 
    <FeatureTag value="aalt"/> 
    <Feature> 
      <!-- LookupCount=2 --> 
      <LookupListIndex index="0" value="0"/> 
      <LookupListIndex index="1" value="1"/> 
    </Feature> 
  </FeatureRecord> 
  <FeatureRecord index="3"> 
    <FeatureTag value="aalt"/> 
    <Feature> 
      <!-- LookupCount=2 --> 
      <LookupListIndex index="0" value="0"/> 
      <LookupListIndex index="1" value="1"/> 
    </Feature> 
  </FeatureRecord> 
  <FeatureRecord index="4"> 
    <FeatureTag value="aalt"/> 
    <Feature> 
      <!-- LookupCount=2 --> 
      <LookupListIndex index="0" value="0"/> 
      <LookupListIndex index="1" value="1"/> 
    </Feature> 
  </FeatureRecord> 

It makes reading the GSUB tables very hard unnecessarily.
The snippet above is from NotoSansCJK-Regular, but I suppose it's the same with 
Source Han Sans.

Original issue reported on code.google.com by behdad@google.com on 31 Jul 2014 at 8:27

[GoogleCodeExporter]

Original comment by stua...@google.com on 28 Feb 2015 at 12:06

• Added labels: Type-Enhancement
• Removed labels: Type-Defect

[behdad]

cc @behdad @kenlunde

[ghost]

Moved to notofonts/noto-cjk#9