Web Animations CSS: Support Animation of StyleImage and LengthBox

Source/core/animation/AnimatableImage.cpp

+/*
+ * Copyright (C) 2013 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.
+ */
+
+#include "config.h"
+#include "core/animation/AnimatableImage.h"
+
+#include "core/css/CSSImageValue.h"
+#include "wtf/MathExtras.h"
+
+namespace WebCore {
+
+PassRefPtr<AnimatableValue> AnimatableImage::interpolateTo(const AnimatableValue* other, double fraction) const
+{
+    const AnimatableImage* otherImage = toAnimatableImage(other);
+    RefPtr<CSSValue> fromValue = this->toCSSValue();
+    if (!fromValue->isImageValue() && !fromValue->isImageGeneratorValue()) {
+        if (!m_image->isImageResource())
+            return defaultInterpolateTo(this, other, fraction);
+        ImageResource* resource = static_cast<ImageResource*>(m_image->data());
+        fromValue = CSSImageValue::create(resource->url(), m_image.get());
+    }
+    RefPtr<CSSValue> toValue = otherImage->toCSSValue();
+    if (!toValue->isImageValue() && !toValue->isImageGeneratorValue()) {
+        if (!otherImage->m_image->isImageResource())
+            return defaultInterpolateTo(this, other, fraction);
+        ImageResource* resource = static_cast<ImageResource*>(otherImage->m_image->data());
+        toValue = CSSImageValue::create(resource->url(), otherImage->m_image.get());
+    }
+    RefPtr<CSSCrossfadeValue> crossfadeValue = CSSCrossfadeValue::create(fromValue, toValue);
+    crossfadeValue->setPercentage(CSSPrimitiveValue::create(clampTo<double>(fraction, 0.0, 1.0), CSSPrimitiveValue::CSS_NUMBER));
+    return create(StyleGeneratedImage::create(crossfadeValue.get()).get());
+}
+
+PassRefPtr<AnimatableValue> AnimatableImage::addWith(const AnimatableValue* other) const
+{
+    // FIXME: Correct procedure is defined here: http://dev.w3.org/fxtf/web-animations/#the--image--type
+    return defaultAddWith(this, other);
+}
+
+}