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LibHTML: Rewrite inline and text layout

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Inline layout is now done by LayoutBlock. Blocks with inline children
will split them into line boxes during layout.

A LayoutBlock can have zero or more LineBox objects. Each LineBox
represents one visual line.

A LineBox can have any number of LineBoxFragment children. A fragment
is an offset+length into a specific LayoutNode.

To paint a LayoutBlock with inline children, we walk its line boxes,
and walk their fragments, painting each fragment at a time by calling
LineBoxFragment::render(), which in turn calls the LayoutNode via
LayoutText::render_fragment(). Hit testing works similarly.

This is very incomplete and has many bugs, but should make it easier
for us to move forward with this code.
This commit is contained in:
Andreas Kling 2019-10-03 15:20:13 +02:00
parent 5966fcff31
commit 1d65cf367f
12 changed files with 339 additions and 187 deletions
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2
Libraries/LibHTML/Makefile.shared
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@ -28,6 +28,8 @@ LIBHTML_OBJS = \
Layout/LayoutInline.o \
Layout/LayoutDocument.o \
Layout/ComputedStyle.o \
Layout/LineBox.o \
Layout/LineBoxFragment.o \
HtmlView.o \
Dump.o