Refactoring animation code in accelerated path.

Source/core/rendering/animation/WebAnimationProvider.cpp

Index: Source/core/rendering/animation/WebAnimationProvider.cpp
diff --git a/Source/core/rendering/animation/WebAnimationProvider.cpp b/Source/core/rendering/animation/WebAnimationProvider.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..eedb3cf8f28b69d6ac65fe14487b33e6523e5afb
--- /dev/null
+++ b/Source/core/rendering/animation/WebAnimationProvider.cpp
@@ -0,0 +1,214 @@
+/*
+ * Copyright (C) 2013 Intel Corporation. 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 APPLE INC. ``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 APPLE COMPUTER, INC. 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/rendering/animation/WebAnimationProvider.h"
+
+#include "core/platform/animation/AnimationTranslationUtil.h"
+#include "core/platform/animation/CSSAnimationData.h"
+#include "core/rendering/style/KeyframeList.h"
+#include "core/rendering/style/RenderStyle.h"
+#include "public/platform/WebAnimation.h"
+#include "wtf/text/StringBuilder.h"
+
+using WebKit::WebAnimation;
+
+namespace WebCore {
+
+namespace {
+
+String animationNameForTransition(AnimatedPropertyID property)
+{
+    // | is not a valid identifier character in CSS, so this can never conflict with a keyframe identifier.
+    StringBuilder id;
+    id.appendLiteral("-|transition");
+    id.appendNumber(static_cast<int>(property));
+    id.append('-');
+    return id.toString();
+}
+
+AnimatedPropertyID cssToGraphicsLayerProperty(CSSPropertyID cssProperty)
+{
+    switch (cssProperty) {
+    case CSSPropertyWebkitTransform:
+        return AnimatedPropertyWebkitTransform;
+    case CSSPropertyOpacity:
+        return AnimatedPropertyOpacity;
+    case CSSPropertyBackgroundColor:
+        return AnimatedPropertyBackgroundColor;

[Ian Vollick, 2013/09/19 15:04:30]

Are we accelerating this already?

[dshwang, 2013/09/19 15:56:48]

Code looks like accelerated.
void GraphicsLayer::setBackgroundColor(const Color& color)
{
    if (color == m_backgroundColor)
        return;

    m_backgroundColor = color;
    m_layer->layer()->setBackgroundColor(m_backgroundColor.rgb());
}

+    case CSSPropertyWebkitFilter:
+        return AnimatedPropertyWebkitFilter;
+    default:
+        // It's fine if we see other css properties here; they are just not accelerated.
+        break;
+    }
+    return AnimatedPropertyInvalid;
+}
+
+} // namespace
+
+WebAnimations::WebAnimations()
+{
+}
+
+WebAnimations::~WebAnimations()
+{
+}
+
+// Copy constructor is needed to use this struct as a return value. It actually moves the ownership, not copy.
+WebAnimations::WebAnimations(const WebAnimations& other)
+{
+    ASSERT(isEmpty());
+    m_transformAnimation.swap(const_cast<OwnPtr<WebAnimation>& >(other.m_transformAnimation));
+    m_opacityAnimation.swap(const_cast<OwnPtr<WebAnimation>& >(other.m_opacityAnimation));
+    m_filterAnimation.swap(const_cast<OwnPtr<WebAnimation>& >(other.m_filterAnimation));
+    ASSERT(other.isEmpty());
+}
+
+bool WebAnimations::isEmpty() const
+{
+    return !m_transformAnimation && !m_opacityAnimation && !m_filterAnimation;
+}
+
+WebAnimationProvider::WebAnimationProvider()
+{
+}
+
+WebAnimationProvider::~WebAnimationProvider()
+{
+}
+
+int WebAnimationProvider::getWebAnimationId(const String& animationName) const
+{
+    if (!m_animationIdMap.contains(animationName))
+        return 0;
+    return m_animationIdMap.get(animationName);
+}
+
+int WebAnimationProvider::getWebAnimationId(CSSPropertyID property) const
+{
+    AnimatedPropertyID animatedProperty = cssToGraphicsLayerProperty(property);
+    if (animatedProperty == AnimatedPropertyInvalid)
+        return 0;
+    return getWebAnimationId(animationNameForTransition(animatedProperty));
+}
+
+WebAnimations WebAnimationProvider::startAnimation(double timeOffset, const CSSAnimationData* anim, const KeyframeList& keyframes, bool hasTransform, const IntSize& boxSize)
+{
+    ASSERT(hasTransform || boxSize.isEmpty());
+    bool hasOpacity = keyframes.containsProperty(CSSPropertyOpacity);
+    bool hasFilter = keyframes.containsProperty(CSSPropertyWebkitFilter);
+
+    if (!hasOpacity && !hasTransform && !hasFilter)
+        return WebAnimations();
+
+    KeyframeValueList transformVector(AnimatedPropertyWebkitTransform);
+    KeyframeValueList opacityVector(AnimatedPropertyOpacity);
+    KeyframeValueList filterVector(AnimatedPropertyWebkitFilter);
+
+    size_t numKeyframes = keyframes.size();
+    for (size_t i = 0; i < numKeyframes; ++i) {
+        const KeyframeValue& currentKeyframe = keyframes[i];
+        const RenderStyle* keyframeStyle = currentKeyframe.style();
+        double key = currentKeyframe.key();
+
+        if (!keyframeStyle)
+            continue;
+
+        // Get timing function.
+        RefPtr<TimingFunction> tf = currentKeyframe.timingFunction(keyframes.animationName());
+
+        bool isFirstOrLastKeyframe = !key || key == 1;
+        if ((hasTransform && isFirstOrLastKeyframe) || currentKeyframe.containsProperty(CSSPropertyWebkitTransform))
+            transformVector.insert(adoptPtr(new TransformAnimationValue(key, &(keyframeStyle->transform()), tf)));
+
+        if ((hasOpacity && isFirstOrLastKeyframe) || currentKeyframe.containsProperty(CSSPropertyOpacity))
+            opacityVector.insert(adoptPtr(new FloatAnimationValue(key, keyframeStyle->opacity(), tf)));
+
+        if ((hasFilter && isFirstOrLastKeyframe) || currentKeyframe.containsProperty(CSSPropertyWebkitFilter))
+            filterVector.insert(adoptPtr(new FilterAnimationValue(key, &(keyframeStyle->filter()), tf)));
+    }
+    WebAnimations resultAnimations;
+    if (hasTransform)
+        resultAnimations.m_transformAnimation = appendWebAnimation(transformVector, boxSize, anim, keyframes.animationName(), timeOffset);

[Ian Vollick, 2013/09/19 15:04:30]

appendWebAnimation feels a bit confusing; I can't tell what it's appending to.
Maybe createWebAnimation?

[dshwang, 2013/09/19 15:56:48]

I'll rename createWebAnimation. appendWebAnimation appends id to HashMap so I
named appendWebAnimation. but it is a bit confusing because it appends the id,
not WebAnimation.

+    if (hasOpacity)
+        resultAnimations.m_opacityAnimation = appendWebAnimation(opacityVector, IntSize(), anim, keyframes.animationName(), timeOffset);
+    if (hasFilter)
+        resultAnimations.m_filterAnimation = appendWebAnimation(filterVector, IntSize(), anim, keyframes.animationName(), timeOffset);
+
+    return resultAnimations;
+}
+
+WebAnimations WebAnimationProvider::startTransition(double timeOffset, CSSPropertyID property, const RenderStyle* fromStyle, const RenderStyle* toStyle, bool hasTransform, bool hasFilter, const IntSize& boxSize, float fromOpacity, float toOpacity)
+{
+    ASSERT(property != CSSPropertyInvalid);
+    ASSERT(property == CSSPropertyOpacity || (!fromOpacity && !toOpacity));
+
+    WebAnimations resultAnimations;
+    if (property == CSSPropertyOpacity) {
+        const CSSAnimationData* opacityAnim = toStyle->transitionForProperty(CSSPropertyOpacity);
+        if (opacityAnim && !opacityAnim->isEmptyOrZeroDuration()) {
+            KeyframeValueList opacityVector(AnimatedPropertyOpacity);
+            opacityVector.insert(adoptPtr(new FloatAnimationValue(0, fromOpacity)));
+            opacityVector.insert(adoptPtr(new FloatAnimationValue(1, toOpacity)));
+            resultAnimations.m_opacityAnimation = appendWebAnimation(opacityVector, IntSize(), opacityAnim, animationNameForTransition(AnimatedPropertyOpacity), timeOffset);
+        }
+    }
+    if (property == CSSPropertyWebkitTransform && hasTransform) {
+        const CSSAnimationData* transformAnim = toStyle->transitionForProperty(CSSPropertyWebkitTransform);
+        if (transformAnim && !transformAnim->isEmptyOrZeroDuration()) {
+            KeyframeValueList transformVector(AnimatedPropertyWebkitTransform);
+            transformVector.insert(adoptPtr(new TransformAnimationValue(0, &fromStyle->transform())));
+            transformVector.insert(adoptPtr(new TransformAnimationValue(1, &toStyle->transform())));
+            resultAnimations.m_transformAnimation = appendWebAnimation(transformVector, boxSize, transformAnim, animationNameForTransition(AnimatedPropertyWebkitTransform), timeOffset);
+        }
+    }
+    if (property == CSSPropertyWebkitFilter && hasFilter) {
+        const CSSAnimationData* filterAnim = toStyle->transitionForProperty(CSSPropertyWebkitFilter);
+        if (filterAnim && !filterAnim->isEmptyOrZeroDuration()) {
+            KeyframeValueList filterVector(AnimatedPropertyWebkitFilter);
+            filterVector.insert(adoptPtr(new FilterAnimationValue(0, &fromStyle->filter())));
+            filterVector.insert(adoptPtr(new FilterAnimationValue(1, &toStyle->filter())));
+            resultAnimations.m_filterAnimation = appendWebAnimation(filterVector, IntSize(), filterAnim, animationNameForTransition(AnimatedPropertyWebkitFilter), timeOffset);
+        }
+    }
+
+    return resultAnimations;
+}
+
+PassOwnPtr<WebAnimation> WebAnimationProvider::appendWebAnimation(const KeyframeValueList& values, const IntSize& boxSize, const CSSAnimationData* animation, const String& animationName, double timeOffset)
+{
+    int animationId = getWebAnimationId(animationName);
+    OwnPtr<WebAnimation> webAnimation(createWebAnimation(values, animation, animationId, timeOffset, boxSize));
+    if (!webAnimation)
+        return PassOwnPtr<WebAnimation>();
+
+    if (!animationId)
+        m_animationIdMap.set(animationName, webAnimation->id());
+    return webAnimation.release();
+}
+
+} // namespace WebCore