SVG: hit testing region for <text> elements is incorrect
https://bugs.webkit.org/show_bug.cgi?id=150838
Patch by Antoine Quint <graouts@apple.com> on 2015-11-04
Reviewed by Dean Jackson.
Source/WebCore:
Hit testing for SVG <text> elements was using the same code as hit testing
for CSS-rendered elements. However, in SVG, text elements should only hit
test based on their character cells, not the rectangular bounds of the
element, see section 16.6 of the SVG 1.1 specification:
http://www.w3.org/TR/SVG11/interact.html#PointerEventsProperty
So we now hit test each SVGTextFragment of each SVGInlineTextBox
that is a child of an SVGRootInlineBox to correctly find whether the
provided HitTestLocation is contained within a character cell.
Tests: svg/hittest/text-dominant-baseline-hanging.svg
svg/hittest/text-multiple-dx-values.svg
svg/hittest/text-with-multiple-tspans.svg
svg/hittest/text-with-text-node-and-content-elements.svg
svg/hittest/text-with-text-node-only.svg
svg/hittest/text-with-text-path.svg
* rendering/RootInlineBox.h:
Remove the final keyword since nodeAtPoint() may now be subclassed as
implemented in SVGRootInlineBox.
* rendering/svg/SVGInlineTextBox.cpp:
(WebCore::SVGInlineTextBox::nodeAtPoint):
Iterate over the SVGTextFragments to look for a fragment containing the
provided HitTestLocation.
* rendering/svg/SVGRootInlineBox.cpp:
(WebCore::SVGRootInlineBox::nodeAtPoint):
* rendering/svg/SVGRootInlineBox.h:
Override RootInlineBox::nodeAtPoint() to delegate hit testing to the
children inline boxes.
LayoutTests:
* svg/hittest/text-dominant-baseline-hanging-expected.svg: Added.
* svg/hittest/text-dominant-baseline-hanging.svg: Added.
* svg/hittest/text-multiple-dx-values-expected.svg: Added.
* svg/hittest/text-multiple-dx-values.svg: Added.
* svg/hittest/text-with-multiple-tspans-expected.svg: Added.
* svg/hittest/text-with-multiple-tspans.svg: Added.
* svg/hittest/text-with-text-node-and-content-elements-expected.svg: Added.
* svg/hittest/text-with-text-node-and-content-elements.svg: Added.
* svg/hittest/text-with-text-node-only-expected.svg: Added.
* svg/hittest/text-with-text-node-only.svg: Added.
* svg/hittest/text-with-text-path-expected.svg: Added.
* svg/hittest/text-with-text-path.svg: Added.
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@192020
268f45cc-cd09-0410-ab3c-
d52691b4dbfc