Bug 147862 - [iOS] Arabic letter Yeh is drawn in LastResort
Summary: [iOS] Arabic letter Yeh is drawn in LastResort
Status: RESOLVED FIXED
Alias: None
Product: WebKit
Classification: Unclassified
Component: New Bugs (show other bugs)
Version: 528+ (Nightly build)
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Myles C. Maxfield
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2015-08-10 19:18 PDT by Myles C. Maxfield
Modified: 2015-08-11 11:06 PDT (History)
5 users (show)

See Also:


Attachments
Patch (9.29 KB, patch)
2015-08-10 19:36 PDT, Myles C. Maxfield
no flags Details | Formatted Diff | Diff
Patch (9.97 KB, patch)
2015-08-10 19:39 PDT, Myles C. Maxfield
darin: review+
Details | Formatted Diff | Diff

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Description Myles C. Maxfield 2015-08-10 19:18:50 PDT
[iOS] Arabic letter Yeh is drawn in LastResort
Comment 1 Myles C. Maxfield 2015-08-10 19:36:11 PDT
Created attachment 258687 [details]
Patch
Comment 2 Myles C. Maxfield 2015-08-10 19:36:36 PDT
<rdar://problem/22202935>
Comment 3 Myles C. Maxfield 2015-08-10 19:39:20 PDT
Created attachment 258689 [details]
Patch
Comment 4 Simon Fraser (smfr) 2015-08-10 20:42:04 PDT
Comment on attachment 258689 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=258689&action=review

> Source/WebCore/ChangeLog:33
> +        Test: fast/text/arabic-glyph-cache-fill-combine.html

If this problem is so general, why is it that the test is iOS-specific? Can you construct a Mac test?
Comment 5 Myles C. Maxfield 2015-08-11 08:38:57 PDT
Comment on attachment 258689 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=258689&action=review

>> Source/WebCore/ChangeLog:33
>> +        Test: fast/text/arabic-glyph-cache-fill-combine.html
> 
> If this problem is so general, why is it that the test is iOS-specific? Can you construct a Mac test?

The bug requires 1. Successive Unicode code points which combine to form a grapheme cluster, 2. Such a combining sequence must not occur across a boundary of 256 code points, and 3. A font which supports all the constituents of the combined grapheme cluster. I'll see if I can find such a case.
Comment 6 Myles C. Maxfield 2015-08-11 11:06:01 PDT
Committed r188263: <http://trac.webkit.org/changeset/188263>