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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/283754">283754</a></dd>
<dt>Author</dt> <dd>zalan@apple.com</dd>
<dt>Date</dt> <dd>2021-10-07 16:25:05 -0700 (Thu, 07 Oct 2021)</dd>
</dl>
<h3>Log Message</h3>
<pre>Do not check for firstLineStyle while constructing RenderText
https://bugs.webkit.org/show_bug.cgi?id=231370
<rdar://83973189>
Reviewed by Antti Koivisto.
Source/WebCore:
First line computation requires the renderer to be fully attached to the tree.
Let's check for "can use simplified text measuring for first line" at a later time, when we
construct the LFC tree instead.
Test: fast/inline/first-line-style-too-early-crash.html
* layout/formattingContexts/inline/InlineTextItem.cpp:
(WebCore::Layout::InlineTextItem::createAndAppendTextItems):
* layout/formattingContexts/inline/text/TextUtil.cpp:
(WebCore::Layout::TextUtil::canUseSimplifiedTextMeasuringForFirstLine):
* layout/formattingContexts/inline/text/TextUtil.h:
* layout/integration/LayoutIntegrationBoxTree.cpp:
(WebCore::LayoutIntegration::BoxTree::buildTree):
* rendering/RenderText.cpp:
(WebCore::RenderText::computeCanUseSimplifiedTextMeasuring const):
LayoutTests:
* TestExpectations: existing bug surfaced by this change.
* fast/inline/first-line-style-too-early-crash-expected.txt: Added.
* fast/inline/first-line-style-too-early-crash.html: Added.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsChangeLog">trunk/LayoutTests/ChangeLog</a></li>
<li><a href="#trunkLayoutTestsTestExpectations">trunk/LayoutTests/TestExpectations</a></li>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCorelayoutformattingContextsinlineInlineTextItemcpp">trunk/Source/WebCore/layout/formattingContexts/inline/InlineTextItem.cpp</a></li>
<li><a href="#trunkSourceWebCorelayoutformattingContextsinlinetextTextUtilcpp">trunk/Source/WebCore/layout/formattingContexts/inline/text/TextUtil.cpp</a></li>
<li><a href="#trunkSourceWebCorelayoutformattingContextsinlinetextTextUtilh">trunk/Source/WebCore/layout/formattingContexts/inline/text/TextUtil.h</a></li>
<li><a href="#trunkSourceWebCorelayoutintegrationLayoutIntegrationBoxTreecpp">trunk/Source/WebCore/layout/integration/LayoutIntegrationBoxTree.cpp</a></li>
<li><a href="#trunkSourceWebCorerenderingRenderTextcpp">trunk/Source/WebCore/rendering/RenderText.cpp</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsfastinlinefirstlinestyletooearlycrashexpectedtxt">trunk/LayoutTests/fast/inline/first-line-style-too-early-crash-expected.txt</a></li>
<li><a href="#trunkLayoutTestsfastinlinefirstlinestyletooearlycrashhtml">trunk/LayoutTests/fast/inline/first-line-style-too-early-crash.html</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (283753 => 283754)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog 2021-10-07 23:12:14 UTC (rev 283753)
+++ trunk/LayoutTests/ChangeLog 2021-10-07 23:25:05 UTC (rev 283754)
</span><span class="lines">@@ -1,3 +1,15 @@
</span><ins>+2021-10-07 Alan Bujtas <zalan@apple.com>
+
+ Do not check for firstLineStyle while constructing RenderText
+ https://bugs.webkit.org/show_bug.cgi?id=231370
+ <rdar://83973189>
+
+ Reviewed by Antti Koivisto.
+
+ * TestExpectations: existing bug surfaced by this change.
+ * fast/inline/first-line-style-too-early-crash-expected.txt: Added.
+ * fast/inline/first-line-style-too-early-crash.html: Added.
+
</ins><span class="cx"> 2021-10-07 Ayumi Kojima <ayumi_kojima@apple.com>
</span><span class="cx">
</span><span class="cx"> [ iOS ] Marking expectations as slow for the tests that are flaky timing out.
</span></span></pre></div>
<a id="trunkLayoutTestsTestExpectations"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/TestExpectations (283753 => 283754)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/TestExpectations 2021-10-07 23:12:14 UTC (rev 283753)
+++ trunk/LayoutTests/TestExpectations 2021-10-07 23:25:05 UTC (rev 283754)
</span><span class="lines">@@ -4667,6 +4667,7 @@
</span><span class="cx"> webkit.org/b/214461 imported/w3c/web-platform-tests/css/css-pseudo/marker-unicode-bidi-default.html [ ImageOnlyFailure ]
</span><span class="cx"> webkit.org/b/214461 imported/w3c/web-platform-tests/css/css-pseudo/marker-unicode-bidi-normal.html [ ImageOnlyFailure ]
</span><span class="cx"> webkit.org/b/214461 imported/w3c/web-platform-tests/css/css-pseudo/spelling-error-001.html [ ImageOnlyFailure ]
</span><ins>+webkit.org/b/230964 imported/w3c/web-platform-tests/css/css-pseudo/first-line-and-placeholder.html [ ImageOnlyFailure ]
</ins><span class="cx">
</span><span class="cx"> webkit.org/b/214462 imported/w3c/web-platform-tests/css/css-scoping/host-context-specificity-001.html [ ImageOnlyFailure ]
</span><span class="cx"> webkit.org/b/214462 imported/w3c/web-platform-tests/css/css-scoping/host-context-specificity-002.html [ ImageOnlyFailure ]
</span></span></pre></div>
<a id="trunkLayoutTestsfastinlinefirstlinestyletooearlycrashexpectedtxt"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/inline/first-line-style-too-early-crash-expected.txt (0 => 283754)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/inline/first-line-style-too-early-crash-expected.txt (rev 0)
+++ trunk/LayoutTests/fast/inline/first-line-style-too-early-crash-expected.txt 2021-10-07 23:25:05 UTC (rev 283754)
</span><span class="lines">@@ -0,0 +1 @@
</span><ins>+PASS if no crash or assert.
</ins></span></pre></div>
<a id="trunkLayoutTestsfastinlinefirstlinestyletooearlycrashhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/inline/first-line-style-too-early-crash.html (0 => 283754)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/inline/first-line-style-too-early-crash.html (rev 0)
+++ trunk/LayoutTests/fast/inline/first-line-style-too-early-crash.html 2021-10-07 23:25:05 UTC (rev 283754)
</span><span class="lines">@@ -0,0 +1,16 @@
</span><ins>+<style>
+ ::first-line {
+ width: 0;
+ }
+</style>
+<script>
+if (window.testRunner)
+ testRunner.dumpAsText();
+ onload = () => {
+ document.designMode = 'on';
+ document.execCommand('SelectAll');
+ document.execCommand('Bold');
+ document.execCommand('InsertOrderedList');
+ };
+</script>
+<div></div>PASS if no crash or assert.
</ins><span class="cx">\ No newline at end of file
</span></span></pre></div>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (283753 => 283754)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog 2021-10-07 23:12:14 UTC (rev 283753)
+++ trunk/Source/WebCore/ChangeLog 2021-10-07 23:25:05 UTC (rev 283754)
</span><span class="lines">@@ -1,3 +1,27 @@
</span><ins>+2021-10-07 Alan Bujtas <zalan@apple.com>
+
+ Do not check for firstLineStyle while constructing RenderText
+ https://bugs.webkit.org/show_bug.cgi?id=231370
+ <rdar://83973189>
+
+ Reviewed by Antti Koivisto.
+
+ First line computation requires the renderer to be fully attached to the tree.
+ Let's check for "can use simplified text measuring for first line" at a later time, when we
+ construct the LFC tree instead.
+
+ Test: fast/inline/first-line-style-too-early-crash.html
+
+ * layout/formattingContexts/inline/InlineTextItem.cpp:
+ (WebCore::Layout::InlineTextItem::createAndAppendTextItems):
+ * layout/formattingContexts/inline/text/TextUtil.cpp:
+ (WebCore::Layout::TextUtil::canUseSimplifiedTextMeasuringForFirstLine):
+ * layout/formattingContexts/inline/text/TextUtil.h:
+ * layout/integration/LayoutIntegrationBoxTree.cpp:
+ (WebCore::LayoutIntegration::BoxTree::buildTree):
+ * rendering/RenderText.cpp:
+ (WebCore::RenderText::computeCanUseSimplifiedTextMeasuring const):
+
</ins><span class="cx"> 2021-10-07 Myles C. Maxfield <mmaxfield@apple.com>
</span><span class="cx">
</span><span class="cx"> Stop parsing font palette things that we can't implement
</span></span></pre></div>
<a id="trunkSourceWebCorelayoutformattingContextsinlineInlineTextItemcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/layout/formattingContexts/inline/InlineTextItem.cpp (283753 => 283754)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/layout/formattingContexts/inline/InlineTextItem.cpp 2021-10-07 23:12:14 UTC (rev 283753)
+++ trunk/Source/WebCore/layout/formattingContexts/inline/InlineTextItem.cpp 2021-10-07 23:25:05 UTC (rev 283754)
</span><span class="lines">@@ -86,10 +86,9 @@
</span><span class="cx"> unsigned currentPosition = 0;
</span><span class="cx">
</span><span class="cx"> auto inlineItemWidth = [&](auto startPosition, auto length) -> std::optional<InlineLayoutUnit> {
</span><del>- if (!inlineTextBox.canUseSimplifiedContentMeasuring())
</del><ins>+ if (!inlineTextBox.canUseSimplifiedContentMeasuring()
+ || !TextUtil::canUseSimplifiedTextMeasuringForFirstLine(inlineTextBox.style(), inlineTextBox.firstLineStyle()))
</ins><span class="cx"> return { };
</span><del>- if (inlineTextBox.style() != inlineTextBox.firstLineStyle())
- return { };
</del><span class="cx"> return TextUtil::width(inlineTextBox, fontCascade, startPosition, startPosition + length, { });
</span><span class="cx"> };
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceWebCorelayoutformattingContextsinlinetextTextUtilcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/layout/formattingContexts/inline/text/TextUtil.cpp (283753 => 283754)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/layout/formattingContexts/inline/text/TextUtil.cpp 2021-10-07 23:12:14 UTC (rev 283753)
+++ trunk/Source/WebCore/layout/formattingContexts/inline/text/TextUtil.cpp 2021-10-07 23:25:05 UTC (rev 283754)
</span><span class="lines">@@ -241,6 +241,11 @@
</span><span class="cx"> return LineBreakIteratorMode::Default;
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+bool TextUtil::canUseSimplifiedTextMeasuringForFirstLine(const RenderStyle& style, const RenderStyle& firstLineStyle)
+{
+ return style.collapseWhiteSpace() == firstLineStyle.collapseWhiteSpace() && style.fontCascade() == firstLineStyle.fontCascade();
</ins><span class="cx"> }
</span><ins>+
</ins><span class="cx"> }
</span><ins>+}
</ins><span class="cx"> #endif
</span></span></pre></div>
<a id="trunkSourceWebCorelayoutformattingContextsinlinetextTextUtilh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/layout/formattingContexts/inline/text/TextUtil.h (283753 => 283754)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/layout/formattingContexts/inline/text/TextUtil.h 2021-10-07 23:12:14 UTC (rev 283753)
+++ trunk/Source/WebCore/layout/formattingContexts/inline/text/TextUtil.h 2021-10-07 23:25:05 UTC (rev 283754)
</span><span class="lines">@@ -63,6 +63,7 @@
</span><span class="cx">
</span><span class="cx"> static bool shouldPreserveSpacesAndTabs(const Box&);
</span><span class="cx"> static bool shouldPreserveNewline(const Box&);
</span><ins>+ static bool canUseSimplifiedTextMeasuringForFirstLine(const RenderStyle&, const RenderStyle& firstLineStyle);
</ins><span class="cx"> };
</span><span class="cx">
</span><span class="cx"> }
</span></span></pre></div>
<a id="trunkSourceWebCorelayoutintegrationLayoutIntegrationBoxTreecpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/layout/integration/LayoutIntegrationBoxTree.cpp (283753 => 283754)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/layout/integration/LayoutIntegrationBoxTree.cpp 2021-10-07 23:12:14 UTC (rev 283753)
+++ trunk/Source/WebCore/layout/integration/LayoutIntegrationBoxTree.cpp 2021-10-07 23:25:05 UTC (rev 283754)
</span><span class="lines">@@ -37,6 +37,7 @@
</span><span class="cx"> #include "RenderChildIterator.h"
</span><span class="cx"> #include "RenderImage.h"
</span><span class="cx"> #include "RenderLineBreak.h"
</span><ins>+#include "TextUtil.h"
</ins><span class="cx">
</span><span class="cx"> namespace WebCore {
</span><span class="cx"> namespace LayoutIntegration {
</span><span class="lines">@@ -89,9 +90,14 @@
</span><span class="cx"> if (is<RenderText>(childRenderer)) {
</span><span class="cx"> auto& textRenderer = downcast<RenderText>(childRenderer);
</span><span class="cx"> auto style = RenderStyle::createAnonymousStyleWithDisplay(textRenderer.style(), DisplayType::Inline);
</span><ins>+ auto canUseSimplifiedTextMeasuring = [&] {
+ if (!textRenderer.canUseSimplifiedTextMeasuring())
+ return false;
+ return !firstLineStyle || Layout::TextUtil::canUseSimplifiedTextMeasuringForFirstLine(style, *firstLineStyle);
+ }();
</ins><span class="cx"> return makeUnique<Layout::InlineTextBox>(
</span><span class="cx"> style.textSecurity() == TextSecurity::None ? textRenderer.text() : RenderBlock::updateSecurityDiscCharacters(style, textRenderer.text())
</span><del>- , textRenderer.canUseSimplifiedTextMeasuring(), WTFMove(style), WTFMove(firstLineStyle));
</del><ins>+ , canUseSimplifiedTextMeasuring, WTFMove(style), WTFMove(firstLineStyle));
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> auto style = RenderStyle::clone(childRenderer.style());
</span></span></pre></div>
<a id="trunkSourceWebCorerenderingRenderTextcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/rendering/RenderText.cpp (283753 => 283754)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/rendering/RenderText.cpp 2021-10-07 23:12:14 UTC (rev 283753)
+++ trunk/Source/WebCore/rendering/RenderText.cpp 2021-10-07 23:25:05 UTC (rev 283754)
</span><span class="lines">@@ -1431,12 +1431,6 @@
</span><span class="cx">
</span><span class="cx"> // FIXME: All these checks should be more fine-grained at the inline item level.
</span><span class="cx"> auto& style = this->style();
</span><del>- if (&style != &firstLineStyle()) {
- auto& firstLineStyle = this->firstLineStyle();
- if (style.fontCascade() != firstLineStyle.fontCascade() || style.collapseWhiteSpace() != firstLineStyle.collapseWhiteSpace())
- return false;
- }
-
</del><span class="cx"> auto& fontCascade = style.fontCascade();
</span><span class="cx"> if (fontCascade.wordSpacing() || fontCascade.letterSpacing())
</span><span class="cx"> return false;
</span></span></pre>
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