Initial implementation of WorkletAnimation

third_party/WebKit/Source/modules/compositorworker/WorkletAnimation.cpp

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "modules/compositorworker/WorkletAnimation.h"
+
+#include "core/animation/DocumentTimeline.h"
+#include "core/animation/ScrollTimeline.h"
+#include "platform/wtf/text/WTFString.h"
+
+namespace blink {
+
+namespace {
+bool ValidateTimelines(HeapVector<DocumentTimelineOrScrollTimeline>& timelines,
+                       String* error_string) {
+  for (const auto& timeline : timelines) {
+    if (timeline.isScrollTimeline()) {
+      DoubleOrScrollTimelineAutoKeyword time_range;
+      timeline.getAsScrollTimeline()->timeRange(time_range);
+      if (time_range.isScrollTimelineAutoKeyword()) {
+        *error_string = "ScrollTimeline timeRange must have non-auto value";

[flackr, 2017/05/12 18:08:23]

nit: Maybe "ScrollTimeline timeRange auto is not supported"? have non-auto value
read a bit confusing and this is technically a temporary error until we can
resolve the timeRange against the animation.

[smcgruer, 2017/05/18 17:58:39]

Done.

+        return false;
+      }
+    }
+  }
+  return true;
+}
+}  // namespace
+
+WorkletAnimation* WorkletAnimation::Create(
+    String animator_name,
+    const HeapVector<Member<KeyframeEffectReadOnly>>& effects,
+    HeapVector<DocumentTimelineOrScrollTimeline>& timelines,
+    RefPtr<SerializedScriptValue> user_data,
+    ExceptionState& exception_state) {
+  if (effects.IsEmpty()) {
+    exception_state.ThrowDOMException(kNotSupportedError,
+                                      "Effects array must be non-empty");
+    return nullptr;
+  }
+
+  if (timelines.IsEmpty()) {
+    exception_state.ThrowDOMException(kNotSupportedError,
+                                      "Timelines array must be non-empty");
+    return nullptr;
+  }
+
+  String error_string;
+  if (!ValidateTimelines(timelines, &error_string)) {
+    exception_state.ThrowDOMException(kNotSupportedError, error_string);
+    return nullptr;
+  }
+
+  Document& document = effects.at(0)->Target()->GetDocument();

[flackr, 2017/05/12 18:08:22]

effects.at(0) seems a bit arbitrary, perhaps we should verify all of the effects
have the same document?

[smcgruer, 2017/05/18 17:58:39]

Yes, we should. Done.

+  AnimationTimeline& main_document_timeline = document.Timeline();
+  ExecutionContext* execution_context = document.ContextDocument();
+
+  return new WorkletAnimation(execution_context, main_document_timeline,
+                              animator_name, effects, timelines,
+                              std::move(user_data));
+}
+
+WorkletAnimation::WorkletAnimation(
+    ExecutionContext* execution_context,
+    AnimationTimeline& document_timeline,
+    String animator_name,
+    const HeapVector<Member<KeyframeEffectReadOnly>>& effects,
+    HeapVector<DocumentTimelineOrScrollTimeline>& timelines,
+    RefPtr<SerializedScriptValue> user_data)
+    : Animation(execution_context, document_timeline, nullptr),
+      animator_name_(animator_name),
+      effects_(effects),
+      timelines_(timelines),
+      user_data_(std::move(user_data)) {
+  // Shut the compiler up.

[flackr, 2017/05/12 18:08:22]

Not very nice to the compiler, fortunately I hear it doesn't read comments it
just skips right over them.

[smcgruer, 2017/05/18 17:58:39]

Heh. Just temporary, of course.

+  (void)(effects_);
+  (void)(timelines_);
+  (void)(user_data_);
+}
+
+DEFINE_TRACE(WorkletAnimation) {
+  Animation::Trace(visitor);
+}
+
+}  // namespace blink