Bug 155006 – Simple line layout:: Add text-align: justify support.

• Status: RESOLVED
• Resolution: FIXED
• Component: Layout and Rendering

[zalan]

It is a common property on text content and we can extend simple line layout to support it without regressing performance.

[zalan]

Created attachment 273585 [details]
Patch

[zalan]

 PerformanceTests/Layout/line-layout-simple.html
 before text-align: justify support -> mean: 86.20513022288704 runs/s 
 after -> mean: 96.73972475626084 runs/s

[Build Bot]

Comment on attachment 273585 [details]
Patch

Attachment 273585 [details] did not pass mac-wk2-ews (mac-wk2):
Output: http://webkit-queues.webkit.org/results/955522

New failing tests:
fast/regions/overflow/overflow-in-uniform-regions.html

[Build Bot]

Created attachment 273592 [details]
Archive of layout-test-results from ews106 for mac-yosemite-wk2

The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews.
Bot: ews106  Port: mac-yosemite-wk2  Platform: Mac OS X 10.10.5

[Antti Koivisto]

Comment on attachment 273585 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=273585&action=review

> Source/WebCore/rendering/SimpleLineLayout.cpp:412
> +    std::pair<unsigned, bool> expansionOpportunityCount(unsigned from, unsigned to) const

It looks like bool is true if and only if unsigned >0. Maybe you could just return unsigned and test if it is nonzero in client?

> Source/WebCore/rendering/SimpleLineLayout.cpp:414
> +        unsigned expansionOportunityCount = 0;

Spelling "Oportunity"

> Source/WebCore/rendering/SimpleLineLayout.cpp:420
> +            auto expansionOportunity = this->expansionOportunity(currentFragmentType, previousFragmentType);

Here too

> Source/WebCore/rendering/SimpleLineLayout.cpp:808
> +    auto textAlign = style.textAlign;
> +    // Fallback to LEFT alignment both for non-collapsable content and for the last line.
> +    if (style.textAlign == JUSTIFY && (!style.collapseWhitespace || lastLine))

You could use the 'textAlign' local here.

> Source/WebCore/rendering/SimpleLineLayout.cpp:814
> +    else {
> +        if (float lineLogicalLeft = computeLineLeft(textAlign, line.availableWidth(), line.width(), line.logicalLeftOffset())) {

Could maybe just say 'else if'

> Source/WebCore/rendering/SimpleLineLayout.h:63
> +    // TODO: Move these optional items out of SimpleLineLayout::Run to a supplementary structure.

Yep.

[Build Bot]

Comment on attachment 273585 [details]
Patch

Attachment 273585 [details] did not pass mac-ews (mac):
Output: http://webkit-queues.webkit.org/results/955629

New failing tests:
fast/regions/overflow/overflow-in-uniform-regions.html

[Build Bot]

Created attachment 273594 [details]
Archive of layout-test-results from ews100 for mac-yosemite

The attached test failures were seen while running run-webkit-tests on the mac-ews.
Bot: ews100  Port: mac-yosemite  Platform: Mac OS X 10.10.5

[Build Bot]

Comment on attachment 273585 [details]
Patch

Attachment 273585 [details] did not pass mac-debug-ews (mac):
Output: http://webkit-queues.webkit.org/results/955577

New failing tests:
editing/undo/orphaned-selection-crash-bug32823-2.html
fast/regions/overflow/overflow-in-uniform-regions.html

[Build Bot]

Created attachment 273596 [details]
Archive of layout-test-results from ews113 for mac-yosemite

The attached test failures were seen while running run-webkit-tests on the mac-debug-ews.
Bot: ews113  Port: mac-yosemite  Platform: Mac OS X 10.10.5

[zalan]

Created attachment 273623 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 273623 [details]
Patch

Clearing flags on attachment: 273623

Committed r197987: <http://trac.webkit.org/changeset/197987>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.