Web Animations: Add InterpolableValue hierarchy.

Source/core/animation/InterpolableValue.h

Index: Source/core/animation/InterpolableValue.h
diff --git a/Source/core/animation/InterpolableValue.h b/Source/core/animation/InterpolableValue.h
new file mode 100644
index 0000000000000000000000000000000000000000..906e74867185d37a4c33fd9632214273be6986c6
--- /dev/null
+++ b/Source/core/animation/InterpolableValue.h
@@ -0,0 +1,173 @@
+/*
+ * Copyright (C) 2014 Google Inc. All rights reserved.

[dstockwell, 2014/02/25 02:14:51]

Use the new/shorter license header.

[shans, 2014/02/25 03:26:43]

Done.

+ *
+ * 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"
+
+namespace WebCore {
+
+class InterpolableValue {
+public:
+    virtual PassOwnPtr<InterpolableValue> interpolate(InterpolableValue &other, double percentage) = 0;
+    virtual PassOwnPtr<InterpolableValue> clone() = 0;
+
+    virtual bool isNumber() const { return false; }
+    virtual bool isBool() const { return false; }
+    virtual bool isList() const { return false; }
+
+    virtual ~InterpolableValue() { }
+};
+
+class InterpolableNumber;
+class InterpolableList;
+
+InterpolableNumber* toInterpolableNumber(InterpolableValue*);
+InterpolableList* toInterpolableList(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) OVERRIDE FINAL {

[dstockwell, 2014/02/25 02:14:51]

percentage -> progress

[dstockwell, 2014/02/25 02:14:51]

these non-trivial functions should move to cpp

[shans, 2014/02/25 03:26:43]

Done.

[shans, 2014/02/25 03:26:43]

Done.

+        InterpolableNumber *otherNumber = toInterpolableNumber(&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() OVERRIDE FINAL { return create(m_value); }
+
+    virtual bool isNumber() const OVERRIDE FINAL { return true; }
+
+    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) OVERRIDE FINAL {
+        if (percentage < 0.5) {
+            return clone();
+        }
+        return (other.clone());

[dstockwell, 2014/02/25 02:14:51]

remove parens here

[shans, 2014/02/25 03:26:43]

Done.

+    }
+
+    virtual PassOwnPtr<InterpolableValue> clone() OVERRIDE FINAL { return create(m_value); }
+
+    virtual bool isBool() const OVERRIDE FINAL { return true; }
+
+    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) OVERRIDE FINAL {
+        InterpolableList *otherList = toInterpolableList(&other);

[dstockwell, 2014/02/25 02:14:51]

assert same size

[shans, 2014/02/25 03:26:43]

Done.

+        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() OVERRIDE FINAL { return create(*this); }
+
+    virtual bool isList() const OVERRIDE FINAL { return true; }
+
+    void set(PassOwnPtr<InterpolableValue> value, size_t position) { m_values.get()[position] = value; }

[dstockwell, 2014/02/25 02:14:51]

ASSERT position < m_size? Or is the size mutable?

Seems odd that position is not the first argument.

[shans, 2014/02/25 03:26:43]

Done.

+
+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;
+};
+
+DEFINE_TYPE_CASTS(InterpolableNumber, InterpolableValue, value, value->isNumber(), value.isNumber());
+DEFINE_TYPE_CASTS(InterpolableBool, InterpolableValue, value, value->isBool(), value.isBool());
+DEFINE_TYPE_CASTS(InterpolableList, InterpolableValue, value, value->isList(), value.isList());
+
+}
+
+#endif