Text is misplaced when custom font does not have space glyph.

• Component: Layout and Rendering
• Status: RESOLVED FIXED

[zalan]

BreakingContext and RenderText::computePreferredLogicalWidths() pre-calculates space width and if the associated font does not have space glyph we initiate a fallback font even if the text does not need it. Since both the primary and the fallback fonts are used to figure out ascent/descent information for lines, if the fallback fonts' ascent/descent values are bigger, the line gets misplaced. (as opposed to where it would be placed, if the primary font had space glyph)

[zalan]

Created attachment 252882 [details]
Patch

[Build Bot]

Comment on attachment 252882 [details]
Patch

Attachment 252882 [details] did not pass mac-ews (mac):
Output: http://webkit-queues.appspot.com/results/5717670238355456

New failing tests:
fast/ruby/ruby-expansion-cjk-3.html
fast/ruby/ruby-expansion-cjk.html
fast/ruby/ruby-expansion-cjk-5.html
platform/mac/svg/fonts/svg-font-general.html
fast/ruby/ruby-expansion-cjk-2.html
fast/ruby/ruby-expansion-cjk-4.html

[Build Bot]

Created attachment 252884 [details]
Archive of layout-test-results from ews100 for mac-mavericks

The attached test failures were seen while running run-webkit-tests on the mac-ews.
Bot: ews100  Port: mac-mavericks  Platform: Mac OS X 10.9.5

[Build Bot]

Comment on attachment 252882 [details]
Patch

Attachment 252882 [details] did not pass mac-wk2-ews (mac-wk2):
Output: http://webkit-queues.appspot.com/results/4591770331512832

New failing tests:
fast/ruby/ruby-expansion-cjk-3.html
fast/ruby/ruby-expansion-cjk.html
fast/ruby/ruby-expansion-cjk-5.html
platform/mac/svg/fonts/svg-font-general.html
fast/ruby/ruby-expansion-cjk-2.html
fast/ruby/ruby-expansion-cjk-4.html

[Build Bot]

Created attachment 252885 [details]
Archive of layout-test-results from ews106 for mac-mavericks-wk2

The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews.
Bot: ews106  Port: mac-mavericks-wk2  Platform: Mac OS X 10.9.5

[Myles C. Maxfield]

Comment on attachment 252882 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=252882&action=review

> Source/WebCore/rendering/line/BreakingContext.h:86
> +    enum WordTrailingSpaceState { Uninitialized, Computed };

enum class

[zalan]

Created attachment 252902 [details]
Patch

[zalan]

(In reply to comment #5)
> Created attachment 252885 [details]
> Archive of layout-test-results from ews106 for mac-mavericks-wk2
> 
> The attached test failures were seen while running run-webkit-tests on the
> mac-wk2-ews.
> Bot: ews106  Port: mac-mavericks-wk2  Platform: Mac OS X 10.9.5

Progressions.

[zalan]

Created attachment 252919 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 252919 [details]
Patch

Clearing flags on attachment: 252919

Committed r184150: <http://trac.webkit.org/changeset/184150>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.