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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/287244">287244</a></dd>
<dt>Author</dt> <dd>zalan@apple.com</dd>
<dt>Date</dt> <dd>2021-12-19 11:44:48 -0800 (Sun, 19 Dec 2021)</dd>
</dl>
<h3>Log Message</h3>
<pre>[LFC][IFC] text-indent is treated as a margin applied to the start edge of the line box.
https://bugs.webkit.org/show_bug.cgi?id=234460
Reviewed by Antti Koivisto.
See https://drafts.csswg.org/css-text/#text-indent-property
This is also in preparation for adjusting the display line geometry when the inline axis direction is rtl.
* layout/formattingContexts/inline/InlineLineBuilder.cpp:
(WebCore::Layout::LineBuilder::layoutInlineContent):
(WebCore::Layout::LineBuilder::initialize):
(WebCore::Layout::LineBuilder::initialConstraintsForLine const):
* layout/formattingContexts/inline/InlineLineBuilder.h:
* layout/formattingContexts/inline/InlineRect.h:
(WebCore::Layout::InlineRect::moveLeftBy):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCorelayoutformattingContextsinlineInlineLineBoxBuildercpp">trunk/Source/WebCore/layout/formattingContexts/inline/InlineLineBoxBuilder.cpp</a></li>
<li><a href="#trunkSourceWebCorelayoutformattingContextsinlineInlineLineBuildercpp">trunk/Source/WebCore/layout/formattingContexts/inline/InlineLineBuilder.cpp</a></li>
<li><a href="#trunkSourceWebCorelayoutformattingContextsinlineInlineLineBuilderh">trunk/Source/WebCore/layout/formattingContexts/inline/InlineLineBuilder.h</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (287243 => 287244)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog 2021-12-19 18:52:49 UTC (rev 287243)
+++ trunk/Source/WebCore/ChangeLog 2021-12-19 19:44:48 UTC (rev 287244)
</span><span class="lines">@@ -1,3 +1,21 @@
</span><ins>+2021-12-19 Alan Bujtas <zalan@apple.com>
+
+ [LFC][IFC] text-indent is treated as a margin applied to the start edge of the line box.
+ https://bugs.webkit.org/show_bug.cgi?id=234460
+
+ Reviewed by Antti Koivisto.
+
+ See https://drafts.csswg.org/css-text/#text-indent-property
+ This is also in preparation for adjusting the display line geometry when the inline axis direction is rtl.
+
+ * layout/formattingContexts/inline/InlineLineBuilder.cpp:
+ (WebCore::Layout::LineBuilder::layoutInlineContent):
+ (WebCore::Layout::LineBuilder::initialize):
+ (WebCore::Layout::LineBuilder::initialConstraintsForLine const):
+ * layout/formattingContexts/inline/InlineLineBuilder.h:
+ * layout/formattingContexts/inline/InlineRect.h:
+ (WebCore::Layout::InlineRect::moveLeftBy):
+
</ins><span class="cx"> 2021-12-19 Simon Fraser <simon.fraser@apple.com>
</span><span class="cx">
</span><span class="cx"> Keyboard shortcut to scroll to top when already at the top of the page moves to the bottom
</span></span></pre></div>
<a id="trunkSourceWebCorelayoutformattingContextsinlineInlineLineBoxBuildercpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/layout/formattingContexts/inline/InlineLineBoxBuilder.cpp (287243 => 287244)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/layout/formattingContexts/inline/InlineLineBoxBuilder.cpp 2021-12-19 18:52:49 UTC (rev 287243)
+++ trunk/Source/WebCore/layout/formattingContexts/inline/InlineLineBoxBuilder.cpp 2021-12-19 19:44:48 UTC (rev 287244)
</span><span class="lines">@@ -112,7 +112,7 @@
</span><span class="cx"> auto lineBoxLogicalHeight = constructAndAlignInlineLevelBoxes(lineBox, lineContent.runs, lineIndex);
</span><span class="cx">
</span><span class="cx"> auto line = [&] {
</span><del>- auto lineBoxLogicalRect = InlineRect { lineContent.logicalTopLeft, lineContent.lineLogicalWidth, lineBoxLogicalHeight };
</del><ins>+ auto lineBoxLogicalRect = InlineRect { lineContent.lineLogicalTopLeft, lineContent.lineLogicalWidth, lineBoxLogicalHeight };
</ins><span class="cx"> auto scrollableOverflowRect = lineBoxLogicalRect;
</span><span class="cx"> auto& rootInlineBox = lineBox.rootInlineBox();
</span><span class="cx"> auto enclosingTopAndBottom = InlineDisplay::Line::EnclosingTopAndBottom { lineBoxLogicalRect.top() + rootInlineBox.logicalTop(), lineBoxLogicalRect.top() + rootInlineBox.logicalBottom() };
</span></span></pre></div>
<a id="trunkSourceWebCorelayoutformattingContextsinlineInlineLineBuildercpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/layout/formattingContexts/inline/InlineLineBuilder.cpp (287243 => 287244)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/layout/formattingContexts/inline/InlineLineBuilder.cpp 2021-12-19 18:52:49 UTC (rev 287243)
+++ trunk/Source/WebCore/layout/formattingContexts/inline/InlineLineBuilder.cpp 2021-12-19 19:44:48 UTC (rev 287244)
</span><span class="lines">@@ -288,6 +288,11 @@
</span><span class="cx"> {
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+struct UsedConstraints {
+ InlineRect logicalRect;
+ InlineLayoutUnit marginStart { 0 };
+ bool isConstrainedByFloat { false };
+};
</ins><span class="cx"> LineBuilder::LineContent LineBuilder::layoutInlineContent(const InlineItemRange& needsLayoutRange, size_t partialLeadingContentLength, std::optional<InlineLayoutUnit> overflowingLogicalWidth, const InlineRect& initialLineLogicalRect, bool isFirstLine)
</span><span class="cx"> {
</span><span class="cx"> initialize(initialConstraintsForLine(initialLineLogicalRect, isFirstLine), isFirstLine, needsLayoutRange.start, partialLeadingContentLength, overflowingLogicalWidth);
</span><span class="lines">@@ -332,6 +337,7 @@
</span><span class="cx"> , committedContent.overflowLogicalWidth
</span><span class="cx"> , m_floats
</span><span class="cx"> , m_contentIsConstrainedByFloat
</span><ins>+ , m_lineMarginStart
</ins><span class="cx"> , m_lineLogicalRect.topLeft()
</span><span class="cx"> , m_lineLogicalRect.width()
</span><span class="cx"> , m_line.contentLogicalWidth()
</span><span class="lines">@@ -351,7 +357,7 @@
</span><span class="cx">
</span><span class="cx"> auto committedContent = placeInlineContent(needsLayoutRange);
</span><span class="cx"> auto committedRange = close(needsLayoutRange, committedContent);
</span><del>- auto lineWidth = lineConstraints.logicalRect.left() + m_line.contentLogicalWidth();
</del><ins>+ auto lineWidth = lineConstraints.logicalRect.left() + lineConstraints.marginStart + m_line.contentLogicalWidth();
</ins><span class="cx"> return { committedRange, lineWidth, m_floats };
</span><span class="cx"> }
</span><span class="cx">
</span><span class="lines">@@ -395,7 +401,12 @@
</span><span class="cx"> createLineSpanningInlineBoxes();
</span><span class="cx"> m_line.initialize(m_lineSpanningInlineBoxes);
</span><span class="cx">
</span><ins>+ m_lineMarginStart = lineConstraints.marginStart;
</ins><span class="cx"> m_lineLogicalRect = lineConstraints.logicalRect;
</span><ins>+ m_lineLogicalRect.moveHorizontally(m_lineMarginStart);
+ // While negative margins normally don't expand the available space, preferred width computation gets confused by negative text-indent
+ // (shrink the space needed for the content) which we have to balance it here.
+ m_lineLogicalRect.expandHorizontally(-m_lineMarginStart);
</ins><span class="cx"> m_contentIsConstrainedByFloat = lineConstraints.isConstrainedByFloat;
</span><span class="cx">
</span><span class="cx"> if (partialLeadingContentLength) {
</span><span class="lines">@@ -547,7 +558,7 @@
</span><span class="cx"> return HorizontalConstraints { toLayoutUnit(lineLogicalLeft), toLayoutUnit(lineLogicalRight - lineLogicalLeft) };
</span><span class="cx"> }
</span><span class="cx">
</span><del>-LineBuilder::UsedConstraints LineBuilder::initialConstraintsForLine(const InlineRect& initialLineLogicalRect, bool isFirstLine) const
</del><ins>+UsedConstraints LineBuilder::initialConstraintsForLine(const InlineRect& initialLineLogicalRect, bool isFirstLine) const
</ins><span class="cx"> {
</span><span class="cx"> auto lineLogicalLeft = initialLineLogicalRect.left();
</span><span class="cx"> auto lineLogicalRight = initialLineLogicalRect.right();
</span><span class="lines">@@ -598,8 +609,7 @@
</span><span class="cx"> }
</span><span class="cx"> return { minimumValueForLength(textIndent, initialLineLogicalRect.width()) };
</span><span class="cx"> };
</span><del>- lineLogicalLeft += computedTextIndent();
- return UsedConstraints { { initialLineLogicalRect.top(), lineLogicalLeft, lineLogicalRight - lineLogicalLeft, initialLineLogicalRect.height() }, lineIsConstrainedByFloat };
</del><ins>+ return UsedConstraints { { initialLineLogicalRect.top(), lineLogicalLeft, lineLogicalRight - lineLogicalLeft, initialLineLogicalRect.height() }, computedTextIndent(), lineIsConstrainedByFloat };
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> void LineBuilder::candidateContentForLine(LineCandidate& lineCandidate, size_t currentInlineItemIndex, const InlineItemRange& layoutRange, InlineLayoutUnit currentLogicalRight)
</span></span></pre></div>
<a id="trunkSourceWebCorelayoutformattingContextsinlineInlineLineBuilderh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/layout/formattingContexts/inline/InlineLineBuilder.h (287243 => 287244)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/layout/formattingContexts/inline/InlineLineBuilder.h 2021-12-19 18:52:49 UTC (rev 287243)
+++ trunk/Source/WebCore/layout/formattingContexts/inline/InlineLineBuilder.h 2021-12-19 19:44:48 UTC (rev 287244)
</span><span class="lines">@@ -37,6 +37,7 @@
</span><span class="cx">
</span><span class="cx"> class FloatingContext;
</span><span class="cx"> struct LineCandidate;
</span><ins>+struct UsedConstraints;
</ins><span class="cx">
</span><span class="cx"> class LineBuilder {
</span><span class="cx"> public:
</span><span class="lines">@@ -56,7 +57,8 @@
</span><span class="cx"> std::optional<InlineLayoutUnit> overflowLogicalWidth;
</span><span class="cx"> const FloatList& floats;
</span><span class="cx"> bool hasIntrusiveFloat { false };
</span><del>- InlineLayoutPoint logicalTopLeft;
</del><ins>+ InlineLayoutUnit lineMarginStart { 0 };
+ InlineLayoutPoint lineLogicalTopLeft;
</ins><span class="cx"> InlineLayoutUnit lineLogicalWidth { 0 };
</span><span class="cx"> InlineLayoutUnit contentLogicalWidth { 0 };
</span><span class="cx"> InlineLayoutUnit hangingWhitespaceWidth { 0 };
</span><span class="lines">@@ -88,10 +90,6 @@
</span><span class="cx"> size_t partialTrailingContentLength { 0 };
</span><span class="cx"> std::optional<InlineLayoutUnit> overflowLogicalWidth { };
</span><span class="cx"> };
</span><del>- struct UsedConstraints {
- InlineRect logicalRect;
- bool isConstrainedByFloat { false };
- };
</del><span class="cx"> UsedConstraints initialConstraintsForLine(const InlineRect& initialLineLogicalRect, bool isFirstLine) const;
</span><span class="cx"> std::optional<HorizontalConstraints> floatConstraints(const InlineRect& lineLogicalRect) const;
</span><span class="cx">
</span><span class="lines">@@ -132,6 +130,7 @@
</span><span class="cx">
</span><span class="cx"> Line m_line;
</span><span class="cx"> InlineRect m_lineLogicalRect;
</span><ins>+ InlineLayoutUnit m_lineMarginStart { 0 };
</ins><span class="cx"> const InlineItems& m_inlineItems;
</span><span class="cx"> FloatList m_floats;
</span><span class="cx"> std::optional<InlineTextItem> m_partialLeadingTextItem;
</span></span></pre>
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