[wip] interpolable value refactor. NOT FOR LANDING.

Source/core/animation/InterpolableValue.h

+/*
+ * Copyright (C) 2014 Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * 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.
+ */
+
+#ifndef InterpolableValue_h
+#define InterpolableValue_h
+
+#include "wtf/OwnPtr.h"
+#include "core/animation/AnimatableValue.h"
+
+namespace WebCore {
+
+class InterpolableValue {
+public:
+    virtual PassOwnPtr<InterpolableValue> interpolate(InterpolableValue &other, double percentage) = 0;
+    virtual PassOwnPtr<InterpolableValue> clone() = 0;
+
+    virtual ~InterpolableValue() { }
+};
+
+class InterpolableNumber : public InterpolableValue {
+public:
+    static PassOwnPtr<InterpolableNumber> create(double value)
+    {
+        return adoptPtr(new InterpolableNumber(value));
+    }
+
+    virtual PassOwnPtr<InterpolableValue> interpolate(InterpolableValue &other, double percentage)
+    {
+        InterpolableNumber *otherNumber = static_cast<InterpolableNumber *>(&other);
+        if (!percentage)
+            return create(m_value);
+        if (percentage == 1)
+            return create(otherNumber->m_value);
+        return create(m_value * (1 - percentage) + otherNumber->m_value * percentage);
+    }
+
+    virtual PassOwnPtr<InterpolableValue> clone()
+    {
+        return create(m_value);
+    }
+
+    double value() { return m_value; }
+
+private:
+    double m_value;
+
+    InterpolableNumber(double value)
+        : m_value(value)
+    { }
+
+};
+
+class InterpolableBool : public InterpolableValue {
+public:
+    PassOwnPtr<InterpolableBool> create(bool value)
+    {
+        return adoptPtr(new InterpolableBool(value));
+    }
+
+    virtual PassOwnPtr<InterpolableValue> interpolate(InterpolableValue &other, double percentage)
+    {
+        if (percentage < 0.5) {
+            return clone();
+        }
+        return (other.clone());
+    }
+
+    virtual PassOwnPtr<InterpolableValue> clone()
+    {
+        return create(m_value);
+    }
+
+    bool value() { return m_value; }
+
+private:
+    bool m_value;
+
+    InterpolableBool(bool value)
+        : m_value(value)
+    { }
+};
+
+class InterpolableList : public InterpolableValue {
+public:
+    static PassOwnPtr<InterpolableList> create(InterpolableList &other)
+    {
+        return adoptPtr(new InterpolableList(other));
+    }
+
+    static PassOwnPtr<InterpolableList> create(size_t size)
+    {
+        return adoptPtr(new InterpolableList(size));
+    }
+
+    virtual PassOwnPtr<InterpolableValue> interpolate(InterpolableValue &other, double percentage)
+    {
+        InterpolableList *otherList = static_cast<InterpolableList *>(&other);
+        if (!percentage)
+            return create(*this);
+        if (percentage == 1)
+            return InterpolableList::create(*otherList);
+
+        OwnPtr<InterpolableList> result = create(m_size);
+        for (size_t i = 0; i < m_size; i++)
+            result->set(m_values.get()[i]->interpolate(*(otherList->m_values.get()[i]), percentage), i);
+        return result.release();
+    }
+
+    virtual PassOwnPtr<InterpolableValue> clone()
+    {
+        return create(*this);
+    }
+
+    void set(PassOwnPtr<InterpolableValue> value, size_t position)
+    {
+        m_values.get()[position] = value;
+    }
+
+private:
+    InterpolableList(size_t size)
+        : m_size(size)
+    {
+        m_values = adoptArrayPtr(new OwnPtr<InterpolableValue>[size]);
+    }
+
+    InterpolableList(InterpolableList& other)
+        : m_size(other.m_size)
+    {
+        m_values = adoptArrayPtr(new OwnPtr<InterpolableValue>[m_size]);
+        for (size_t i = 0; i < m_size; i++)
+            set(other.m_values.get()[i]->clone(), i);
+    }
+
+    size_t m_size;
+    OwnPtr<OwnPtr<InterpolableValue>[]> m_values;
+};
+
+// TODO: Kill this until it is dead.
+class InterpolableAnimatableValue : public InterpolableValue
+{
+public:
+    static PassOwnPtr<InterpolableAnimatableValue> create(PassRefPtr<AnimatableValue> value)
+    {
+        return adoptPtr(new InterpolableAnimatableValue(value));
+    }
+
+    virtual PassOwnPtr<InterpolableValue> interpolate(InterpolableValue &other, double percentage)
+    {
+        InterpolableAnimatableValue *otherValue = static_cast<InterpolableAnimatableValue *>(&other);
+        if (!percentage)
+            return create(m_value);
+        if (percentage == 1)
+            return create(otherValue->m_value);
+        return create(AnimatableValue::interpolate(m_value.get(), otherValue->m_value.get(), percentage));
+    }
+
+    AnimatableValue* value() { return m_value.get(); }
+
+    virtual PassOwnPtr<InterpolableValue> clone()
+    {
+        return create(m_value);
+    }
+
+private:
+    InterpolableAnimatableValue(PassRefPtr<AnimatableValue> value)
+        : m_value(value)
+    { }
+
+    RefPtr<AnimatableValue> m_value;
+};
+
+}
+
+#endif