webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 117 insertions, 0 deletions

diff --git a/Source/WebCore/rendering/mathml/MathOperator.h b/Source/WebCore/rendering/mathml/MathOperator.h
new file mode 100644
index 000000000..735eb6a63
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+++ b/Source/WebCore/rendering/mathml/MathOperator.h
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+/*
+ * Copyright (C) 2016 Igalia S.L. All rights reserved.
+ * Copyright (C) 2016 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER OR 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
+
+#if ENABLE(MATHML)
+
+#include "GlyphPage.h"
+#include "LayoutUnit.h"
+#include "OpenTypeMathData.h"
+#include "PaintInfo.h"
+#include <unicode/utypes.h>
+
+namespace WebCore {
+
+class RenderStyle;
+
+class MathOperator {
+public:
+    MathOperator();
+    enum class Type { NormalOperator, DisplayOperator, VerticalOperator, HorizontalOperator };
+    void setOperator(const RenderStyle&, UChar32 baseCharacter, Type);
+    void reset(const RenderStyle&);
+
+    LayoutUnit width() const { return m_width; }
+    LayoutUnit maxPreferredWidth() const { return m_maxPreferredWidth; }
+    LayoutUnit ascent() const { return m_ascent; }
+    LayoutUnit descent() const { return m_descent; }
+    LayoutUnit italicCorrection() const { return m_italicCorrection; }
+
+    void stretchTo(const RenderStyle&, LayoutUnit ascent, LayoutUnit descent);
+    void stretchTo(const RenderStyle&, LayoutUnit width);
+
+    void paint(const RenderStyle&, PaintInfo&, const LayoutPoint&);
+
+private:
+    struct GlyphAssemblyData {
+        UChar32 topOrRightCodePoint { 0 };
+        Glyph topOrRightFallbackGlyph { 0 };
+        UChar32 extensionCodePoint { 0 };
+        Glyph extensionFallbackGlyph { 0 };
+        UChar32 bottomOrLeftCodePoint { 0 };
+        Glyph bottomOrLeftFallbackGlyph { 0 };
+        UChar32 middleCodePoint { 0 };
+        Glyph middleFallbackGlyph { 0 };
+
+        bool hasExtension() const { return extensionCodePoint || extensionFallbackGlyph; }
+        bool hasMiddle() const { return middleCodePoint || middleFallbackGlyph; }
+        void initialize();
+    };
+    enum class StretchType { Unstretched, SizeVariant, GlyphAssembly };
+    enum GlyphPaintTrimming {
+        TrimTop,
+        TrimBottom,
+        TrimTopAndBottom,
+        TrimLeft,
+        TrimRight,
+        TrimLeftAndRight
+    };
+
+    LayoutUnit stretchSize() const;
+    bool getGlyph(const RenderStyle&, UChar32 character, GlyphData&) const;
+    bool getBaseGlyph(const RenderStyle& style, GlyphData& baseGlyph) const { return getGlyph(style, m_baseCharacter, baseGlyph); }
+    void setSizeVariant(const GlyphData&);
+    void setGlyphAssembly(const RenderStyle&, const GlyphAssemblyData&);
+    void getMathVariantsWithFallback(const RenderStyle&, bool isVertical, Vector<Glyph>&, Vector<OpenTypeMathData::AssemblyPart>&);
+    void calculateDisplayStyleLargeOperator(const RenderStyle&);
+    void calculateStretchyData(const RenderStyle&, bool calculateMaxPreferredWidth, LayoutUnit targetSize = 0);
+    bool calculateGlyphAssemblyFallback(const Vector<OpenTypeMathData::AssemblyPart>&, GlyphAssemblyData&) const;
+
+    LayoutRect paintGlyph(const RenderStyle&, PaintInfo&, const GlyphData&, const LayoutPoint& origin, GlyphPaintTrimming);
+    void fillWithVerticalExtensionGlyph(const RenderStyle&, PaintInfo&, const LayoutPoint& from, const LayoutPoint& to);
+    void fillWithHorizontalExtensionGlyph(const RenderStyle&, PaintInfo&, const LayoutPoint& from, const LayoutPoint& to);
+    void paintVerticalGlyphAssembly(const RenderStyle&, PaintInfo&, const LayoutPoint&);
+    void paintHorizontalGlyphAssembly(const RenderStyle&, PaintInfo&, const LayoutPoint&);
+
+    UChar32 m_baseCharacter { 0 };
+    Type m_operatorType { Type::NormalOperator };
+    StretchType m_stretchType { StretchType::Unstretched };
+    union {
+        Glyph m_variantGlyph;
+        GlyphAssemblyData m_assembly;
+    };
+    LayoutUnit m_maxPreferredWidth { 0 };
+    LayoutUnit m_width { 0 };
+    LayoutUnit m_ascent { 0 };
+    LayoutUnit m_descent { 0 };
+    LayoutUnit m_italicCorrection { 0 };
+    float m_radicalVerticalScale { 1 };
+};
+
+}
+
+#endif // ENABLE(MATHML)