Bug 30034 – caretRangeFromPoint() returns wrong result for a zoomed and scrolled page

• Component: DOM
• Status: RESOLVED FIXED

[Xiaomei Ji]

Created attachment 40556 [details]
test case

Steps:
1. Open the attached HTML
2. click mouse somewhere to show the offset of mouse within the element
3. zoom the page *and* resize the window to make the page scroll
4. scroll the page horizontally and/or vertically, 
5. click mouse in the same place as step 2., observe the printed offset.

Results:
the printd offset is different when page is zoomed and scrolled.

Expected:
the printed offset should be the same.

Problem: in Document.caretRangeFromPoint()

    IntPoint point = roundedIntPoint(FloatPoint(x * zoomFactor, y * zoomFactor)) + view()->scrollOffset();

    should be:

    IntPoint point = roundedIntPoint(FloatPoint((x + view()->scrollX()) * zoomFactor, (y + view()->scrollY()) * zoomFactor));


Note:
Same bug applies to elementFromPoint() as well.

[Xiaomei Ji]

Created attachment 40802 [details]
patch w/ layout test

[Eric Seidel (no email)]

Sam's your best bet.  Why don't we have a zoomAndPanTransform() accessor on the document and just map points through that.  It seems using TransformationMatrix and IntPoint would make this code (which we have lots of) much less error prone.

[WebKit Commit Bot]

Comment on attachment 40802 [details]
patch w/ layout test

Rejecting patch 40802 from commit-queue.

Failed to run "['WebKitTools/Scripts/run-webkit-tests', '--no-launch-safari', '--quiet', '--exit-after-n-failures=1']" exit_code: 1
Running build-dumprendertree
Running tests from /Users/eseidel/Projects/CommitQueue/LayoutTests
Testing 11423 test cases.
fast/dom/prototype-inheritance-2.html -> failed

Exiting early after 1 failures. 5497 tests run.
253.83s total testing time

5496 test cases (99%) succeeded
1 test case (<1%) had incorrect layout
1 test case (<1%) had stderr output

[Eric Seidel (no email)]

Comment on attachment 40802 [details]
patch w/ layout test

Sorry.  The bots were behind.  bug 30098.  This is a false rejection.  Trying again.

[WebKit Commit Bot]

Comment on attachment 40802 [details]
patch w/ layout test

Clearing flags on attachment: 40802

Committed r49490: <http://trac.webkit.org/changeset/49490>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.