webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 155 insertions, 0 deletions

diff --git a/Source/WebCore/svg/SVGLengthValue.h b/Source/WebCore/svg/SVGLengthValue.h
new file mode 100644
index 000000000..c7082b4fa
--- /dev/null
+++ b/Source/WebCore/svg/SVGLengthValue.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
+ * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#pragma once
+
+#include "AnimationUtilities.h"
+#include "SVGLengthContext.h"
+#include "SVGParsingError.h"
+#include "SVGPropertyTraits.h"
+
+namespace WebCore {
+
+class CSSPrimitiveValue;
+class QualifiedName;
+
+enum SVGLengthNegativeValuesMode {
+    AllowNegativeLengths,
+    ForbidNegativeLengths
+};
+
+class SVGLengthValue {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    // FIXME: Once all SVGLengthValue users use Length internally, we make this a wrapper for Length.
+    SVGLengthValue(SVGLengthMode = LengthModeOther, const String& valueAsString = String());
+    SVGLengthValue(const SVGLengthContext&, float, SVGLengthMode = LengthModeOther, SVGLengthType = LengthTypeNumber);
+
+    SVGLengthType unitType() const;
+    SVGLengthMode unitMode() const;
+
+    bool operator==(const SVGLengthValue&) const;
+    bool operator!=(const SVGLengthValue&) const;
+
+    static SVGLengthValue construct(SVGLengthMode, const String&, SVGParsingError&, SVGLengthNegativeValuesMode = AllowNegativeLengths);
+
+    float value(const SVGLengthContext&) const;
+    ExceptionOr<float> valueForBindings(const SVGLengthContext&) const;
+    ExceptionOr<void> setValue(float, const SVGLengthContext&);
+    ExceptionOr<void> setValue(const SVGLengthContext&, float, SVGLengthMode, SVGLengthType);
+
+    float valueInSpecifiedUnits() const { return m_valueInSpecifiedUnits; }
+    void setValueInSpecifiedUnits(float value) { m_valueInSpecifiedUnits = value; }
+
+    float valueAsPercentage() const;
+
+    String valueAsString() const;
+    ExceptionOr<void> setValueAsString(const String&);
+    ExceptionOr<void> setValueAsString(const String&, SVGLengthMode);
+    
+    ExceptionOr<void> newValueSpecifiedUnits(unsigned short, float valueInSpecifiedUnits);
+    ExceptionOr<void> convertToSpecifiedUnits(unsigned short, const SVGLengthContext&);
+
+    // Helper functions
+    bool isRelative() const
+    {
+        auto type = unitType();
+        return type == LengthTypePercentage || type == LengthTypeEMS || type == LengthTypeEXS;
+    }
+
+    bool isZero() const 
+    {
+        return !m_valueInSpecifiedUnits;
+    }
+
+    static SVGLengthValue fromCSSPrimitiveValue(const CSSPrimitiveValue&);
+    static Ref<CSSPrimitiveValue> toCSSPrimitiveValue(const SVGLengthValue&);
+    static SVGLengthMode lengthModeForAnimatedLengthAttribute(const QualifiedName&);
+
+    SVGLengthValue blend(const SVGLengthValue& from, float progress) const
+    {
+        auto toType = unitType();
+        auto fromType = from.unitType();
+        if ((from.isZero() && isZero())
+            || fromType == LengthTypeUnknown
+            || toType == LengthTypeUnknown
+            || (!from.isZero() && fromType != LengthTypePercentage && toType == LengthTypePercentage)
+            || (!isZero() && fromType == LengthTypePercentage && toType != LengthTypePercentage)
+            || (!from.isZero() && !isZero() && (fromType == LengthTypeEMS || fromType == LengthTypeEXS) && fromType != toType))
+            return *this;
+
+        SVGLengthValue length;
+
+        if (fromType == LengthTypePercentage || toType == LengthTypePercentage) {
+            auto fromPercent = from.valueAsPercentage() * 100;
+            auto toPercent = valueAsPercentage() * 100;
+            auto result = length.newValueSpecifiedUnits(LengthTypePercentage, WebCore::blend(fromPercent, toPercent, progress));
+            if (result.hasException())
+                return { };
+            return length;
+        }
+
+        if (fromType == toType || from.isZero() || isZero() || fromType == LengthTypeEMS || fromType == LengthTypeEXS) {
+            auto fromValue = from.valueInSpecifiedUnits();
+            auto toValue = valueInSpecifiedUnits();
+            if (isZero()) {
+                auto result = length.newValueSpecifiedUnits(fromType, WebCore::blend(fromValue, toValue, progress));
+                if (result.hasException())
+                    return { };
+            } else {
+                auto result = length.newValueSpecifiedUnits(toType, WebCore::blend(fromValue, toValue, progress));
+                if (result.hasException())
+                    return { };
+            }
+            return length;
+        }
+
+        ASSERT(!isRelative());
+        ASSERT(!from.isRelative());
+
+        SVGLengthContext nonRelativeLengthContext(nullptr);
+        auto fromValueInUserUnits = nonRelativeLengthContext.convertValueToUserUnits(from.valueInSpecifiedUnits(), from.unitMode(), fromType);
+        if (fromValueInUserUnits.hasException())
+            return { };
+
+        auto fromValue = nonRelativeLengthContext.convertValueFromUserUnits(fromValueInUserUnits.releaseReturnValue(), unitMode(), toType);
+        if (fromValue.hasException())
+            return { };
+
+        float toValue = valueInSpecifiedUnits();
+        auto result = length.newValueSpecifiedUnits(toType, WebCore::blend(fromValue.releaseReturnValue(), toValue, progress));
+        if (result.hasException())
+            return { };
+        return length;
+    }
+
+private:
+    float m_valueInSpecifiedUnits { 0 };
+    unsigned m_unit;
+};
+
+template<> struct SVGPropertyTraits<SVGLengthValue> {
+    static SVGLengthValue initialValue() { return { }; }
+    static String toString(const SVGLengthValue& type) { return type.valueAsString(); }
+};
+
+TextStream& operator<<(TextStream&, const SVGLengthValue&);
+
+} // namespace WebCore