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-rw-r--r--layout/style/LayerAnimationInfo.h91
1 files changed, 91 insertions, 0 deletions
diff --git a/layout/style/LayerAnimationInfo.h b/layout/style/LayerAnimationInfo.h
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+++ b/layout/style/LayerAnimationInfo.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_LayerAnimationInfo_h
+#define mozilla_LayerAnimationInfo_h
+
+#include "nsChangeHint.h"
+#include "nsCSSPropertyID.h"
+#include "nsCSSPropertyIDSet.h"
+#include "nsDisplayItemTypes.h" // For nsDisplayItem::Type
+#include "mozilla/Array.h"
+
+namespace mozilla {
+
+struct LayerAnimationInfo {
+ // Returns the corresponding display item type for |aProperty| when it is
+ // animated on the compositor.
+ // Returns DisplayItemType::TYPE_ZERO if |aProperty| cannot be animated on the
+ // compositor.
+ static DisplayItemType GetDisplayItemTypeForProperty(
+ nsCSSPropertyID aProperty);
+
+ // Returns the corresponding CSS properties for |aDisplayItemType|.
+ //
+ // This function works only for display items tied to CSS properties that can
+ // be animated on the compositor.
+ static inline const nsCSSPropertyIDSet& GetCSSPropertiesFor(
+ DisplayItemType aDisplayItemType) {
+ static const nsCSSPropertyIDSet transformProperties =
+ nsCSSPropertyIDSet::TransformLikeProperties();
+ static const nsCSSPropertyIDSet opacityProperties =
+ nsCSSPropertyIDSet{eCSSProperty_opacity};
+ static const nsCSSPropertyIDSet backgroundColorProperties =
+ nsCSSPropertyIDSet{eCSSProperty_background_color};
+ static const nsCSSPropertyIDSet empty = nsCSSPropertyIDSet();
+
+ switch (aDisplayItemType) {
+ case DisplayItemType::TYPE_BACKGROUND_COLOR:
+ return backgroundColorProperties;
+ case DisplayItemType::TYPE_OPACITY:
+ return opacityProperties;
+ case DisplayItemType::TYPE_TRANSFORM:
+ return transformProperties;
+ default:
+ MOZ_ASSERT_UNREACHABLE(
+ "Should not be called for display item types "
+ "that are not able to have animations on the "
+ "compositor");
+ return empty;
+ }
+ }
+
+ // Returns the appropriate change hint for updating the display item for
+ // |aDisplayItemType|.
+ //
+ // This function works only for display items tied to CSS properties that can
+ // be animated on the compositor.
+ static inline nsChangeHint GetChangeHintFor(
+ DisplayItemType aDisplayItemType) {
+ switch (aDisplayItemType) {
+ case DisplayItemType::TYPE_BACKGROUND_COLOR:
+ return nsChangeHint_RepaintFrame;
+ case DisplayItemType::TYPE_OPACITY:
+ return nsChangeHint_UpdateOpacityLayer;
+ case DisplayItemType::TYPE_TRANSFORM:
+ return nsChangeHint_UpdateTransformLayer;
+ default:
+ MOZ_ASSERT_UNREACHABLE(
+ "Should not be called for display item types "
+ "that are not able to have animations on the "
+ "compositor");
+ return nsChangeHint(0);
+ }
+ }
+
+ // An array of DisplayItemType corresponding to the display item that we can
+ // animate on the compositor.
+ //
+ // This is used to look up the appropriate change hint in cases when
+ // animations need updating but no other change hint is generated.
+ static const Array<DisplayItemType,
+ nsCSSPropertyIDSet::CompositorAnimatableDisplayItemCount()>
+ sDisplayItemTypes;
+};
+
+} // namespace mozilla
+
+#endif /* !defined(mozilla_LayerAnimationInfo_h) */