https://bugs.webkit.org/show_bug.cgi?id=80437

Reviewed by Julien Chaffraix.

Updating LayoutUnit usage in RenderBlock and RenderBlockLineLayout. This better readies trunk for
the transition to subpixel layout.

See https://trac.webkit.org/wiki/LayoutUnit for more details.

No new tests. No changed behavior.

* rendering/InlineTextBox.cpp:
(WebCore::InlineTextBox::paint): Adding the paint offset rounding previously in RenderBlock::paint.
* rendering/LayoutTypes.h:
(WebCore::floorToInt): Will floor a LayoutUnit to an integer once we switch to
FractionalLayoutUnits.
(WebCore::boundedMultiply): Method that will return the multiplied result of two LayoutUnits
or the max/min LayoutUnit if the result overflows. Only does a regular multiply while
LayoutUnits are integers instead of FractionalLayoutUnits.
(WebCore):
* rendering/RenderBlock.cpp:
(WebCore::RenderBlock::paintContents): Rounding the paintOffset here didn't work for all
inline blocks. This rounding is actually only needed for InlineTextBoxes, so the logic has
been moved there.
(WebCore::RenderBlock::newLine): Use a LayoutUnit for the y position.
(WebCore::RenderBlock::isPointInOverflowControl): Points for hit testing need to be rounded.
(WebCore::RenderBlock::layoutColumns): Using boundedMultiply for a calculation prone to overflow.
(WebCore::updatePreferredWidth): Reverting back to using ceilf. ceiledLayoutUnit was to be ultimately
converted to just a straight LayoutUnit constructor to preserve precision. This precision doesn't work
for us here as we still paint Boxes/Blocks on pixel boundaries, so we need to expand to a pixel size
that encloses the contained text.
(WebCore::RenderBlock::setPageLogicalOffset): LogicalOffset should be a LayoutUnit.
(WebCore::RenderBlock::marginValuesForChild): Margins should have subpixel resolution.
(WebCore::RenderBlock::FloatingObjects::intervalForFloatingObject): Intervals for floating objects
need to use pixel snapped values to give the proper results.
* rendering/RenderBlock.h:
(WebCore::RenderBlock::pixelSnappedLogicalLeftOffsetForLine): Only moved.
(WebCore::RenderBlock::pixelSnappedLogicalRightOffsetForLine): While we can round the left offset,
columns add an extra offset at paint that can't currently be planned for at line-layout time. To
avoid laying out lines that run off the end of columns, we floor the right offset. The resulting
lines will be up to 1 pixel shorter than they potentially could be.
(RenderBlock):
(WebCore::RenderBlock::FloatingObject::pixelSnappedX): Using corresponding pixelSnappedX value from
LayoutRects.
(WebCore::RenderBlock::FloatingObject::pixelSnappedMaxX): Ditto.
(WebCore::RenderBlock::FloatingObject::pixelSnappedY): Ditto.
(WebCore::RenderBlock::FloatingObject::pixelSnappedMaxY): Ditto.
(WebCore::RenderBlock::FloatingObject::pixelSnappedWidth): Ditto.
(WebCore::RenderBlock::FloatingObject::pixelSnappedHeight): Ditto.
* rendering/RenderBlockLineLayout.cpp:
(WebCore::LineWidth::shrinkAvailableWidthForNewFloatIfNeeded): LogicalHeight is a LayoutUnit. Also
flooring textIndentOffset to an integer to match old behavior.
(WebCore::LineWidth::fitBelowFloats): Using LayoutUnits for float logical top and bottoms.
(WebCore::LineLayoutState::endLineLogicalTop): Changing to a LayoutUnit.
(WebCore::LineLayoutState::setEndLineLogicalTop): Ditto.
(LineLayoutState): Ditto.
(WebCore::RenderBlock::linkToEndLineIfNeeded): Calculating overflow with LayoutUnits.
(WebCore::RenderBlock::layoutInlineChildren): LowestAllowedPosition should be subpixel.
(WebCore::RenderBlock::checkLinesForTextOverflow): Reverting ellipsis width calculation to integers
as this value can be seen as representing pixels on screen.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@110983 268f45cc-cd09-0410-ab3c-d52691b4dbfc