Bug 257746

Summary:

Text opacity shows glyph overlap for cursive scripts

Product:

WebKit

Reporter:

r12a <ishida>

Component:

Text

Assignee:

Nobody <webkit-unassigned>

Status:

NEW

Severity:

Normal

CC:

mmaxfield, webkit-bug-importer

Priority:

Keywords:

InRadar

Version:

Safari 16

Hardware:

Unspecified

OS:

macOS 12

Attachments:

Description	Flags
N'Ko text showing no overlaps in opaque cursive text	none

r12a

Reported 2023-06-06 07:07:08 PDT

Created attachment 466603 [details] N'Ko text showing no overlaps in opaque cursive text This issue is likely to apply to all cursive script text. Text in 'cursive' writing systems is joined by overlapping glyphs with the appropriate joining forms. If those glyphs are made opaque, the joins should not become apparent. For example, N'Ko should look like shown in the attached image. css-color was updated to clarify that opacity should be applied to a whole element, not to individual letters, so that this shouldn't happen. WebKit works as expected for Arabic, Devanagari, Syriac & N'Ko, but not for Adlam (Fulah), Mongolian, or Hanifi Rohingya. It seems that a fix has been applied for certain scripts, but needs to be extended for those mentioned (plus Mandaic). Tests Interactive test, Applying opacity to cursive text doesn't produce dark patches where glyphs overlap https://github.com/w3c/character_phrase_tests/issues/40 I18n test suite, Text opacity https://w3c.github.io/i18n-tests/results/cursive#text_opacity

Attachments
N'Ko text showing no overlaps in opaque cursive text (12.84 KB, image/png) 2023-06-06 07:07 PDT, r12a	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Radar WebKit Bug Importer

Comment 1 2023-06-13 07:08:17 PDT

<rdar://problem/110708611>

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