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Re: [css-writing-modes] 9.1.3 Compression Rules

From: Alan Stearns <stearns@adobe.com>
Date: Sun, 2 Feb 2014 00:59:42 +0000
To: MURAKAMI Shinyu <murakami@antenna.co.jp>
CC: "www-style@w3.org" <www-style@w3.org>
Message-ID: <CF12D814.17FFA%stearns@adobe.com>
On 2/1/14, 9:12 AM, "MURAKAMI Shinyu" <murakami@antenna.co.jp> wrote:

>Alan Stearns <stearns@adobe.com> wrote on 2014/02/02 0:40:58
>> On 2/1/14, 2:33 AM, "MURAKAMI Shinyu" <murakami@antenna.co.jp> wrote:
>> 
>> >http://dev.w3.org/csswg/css-writing-modes/#text-combine-compression

>> >
>> >> Example 20 
>> >> For example, a simple OpenType-based implementation might compress
>> >> the text as follows:
>> >> 1. Enable 1/n-width glyphs for combined text of n characters.
>> >> (I.e. Use OpenType hwid for 2 characters, twid for 3 characters,
>> >> etc.) Note that the number of characters ≠ number of Unicode
>> >> codepoints! 
>> >> 2. Horizontally scale the result to 1em if it is not yet 1em or
>> >>narrower. 
>> >
>> >In this description, "or narrower" in the last sentence seems a
>>mistake.
>> >Narrower text in tate-chu-yoko has no problem and should not scale to
>>1em,
>> >nor change to full-width glyph for 1 character.
>> >(Clarify n ≥ 2 in "Enable 1/n-width glyphs…")
>> 
>> Yes, the sentence is saying to not scale the result if it is already
>> narrower. Another way to phrase the sentence would be:
>> 
>> 2. If the result is wider than 1em, scale the result to 1em.
>> 
>> My sentence and the sentence in the draft are exactly equivalent.
>
>I see.  It was my misreading, I read the sentence as
>"if it is not yet 1em or __it is__ narrower."
>
>I'm afraid that other people do same misreading.
>
>In fact, I found one implementation has this problem;
>MS IE11 (-ms-text-combine-horizontal) scales narrower text to 1em
>or changes the glyph to full-width variant.
>The result of this scaling is very ugly :(

Then perhaps the draft should use my sentence casting (fixed to constrain
the scaling):

2. If the result is wider than 1em, horizontally scale the result to 1em.

Thanks,

Alan

Received on Sunday, 2 February 2014 01:00:25 UTC

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