webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 74 insertions, 0 deletions

diff --git a/Source/WebCore/rendering/SimpleLineLayoutFlowContents.h b/Source/WebCore/rendering/SimpleLineLayoutFlowContents.h
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+++ b/Source/WebCore/rendering/SimpleLineLayoutFlowContents.h
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+/*
+ * Copyright (C) 2014 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "RenderObject.h"
+
+namespace WebCore {
+class RenderBlockFlow;
+
+namespace SimpleLineLayout {
+
+class FlowContents {
+public:
+    FlowContents(const RenderBlockFlow&);
+
+    struct Segment {
+        unsigned toSegmentPosition(unsigned position) const
+        {
+            ASSERT(position >= start);
+            return position - start;
+        }
+        unsigned toRenderPosition(unsigned position) const { return start + position; }
+        unsigned start;
+        unsigned end;
+        StringView text;
+        const RenderObject& renderer;
+        bool canUseSimplifiedTextMeasuring;
+    };
+    const Segment& segmentForRun(unsigned start, unsigned end) const;
+
+    typedef Vector<Segment, 8>::const_iterator Iterator;
+    Iterator begin() const { return m_segments.begin(); }
+    Iterator end() const { return m_segments.end(); }
+
+private:
+    unsigned segmentIndexForRunSlow(unsigned start, unsigned end) const;
+    const Vector<Segment, 8> m_segments;
+    mutable unsigned m_lastSegmentIndex { 0 };
+};
+
+inline const FlowContents::Segment& FlowContents::segmentForRun(unsigned start, unsigned end) const
+{
+    ASSERT(start <= end);
+    auto& lastSegment = m_segments[m_lastSegmentIndex];
+    if (lastSegment.start <= start && end <= lastSegment.end)
+        return m_segments[m_lastSegmentIndex];
+    return m_segments[segmentIndexForRunSlow(start, end)];
+}
+
+}
+}