| # Copyright 2017 The Chromium Authors | |
| # Use of this source code is governed by a BSD-style license that can be | |
| # found in the LICENSE file. | |
| # | |
| # Contributing to Chrome DevTools Protocol: https://goo.gle/devtools-contribution-guide-cdp | |
| experimental domain LayerTree | |
| depends on DOM | |
| # Unique Layer identifier. | |
| type LayerId extends string | |
| # Unique snapshot identifier. | |
| type SnapshotId extends string | |
| # Rectangle where scrolling happens on the main thread. | |
| type ScrollRect extends object | |
| properties | |
| # Rectangle itself. | |
| DOM.Rect rect | |
| # Reason for rectangle to force scrolling on the main thread | |
| enum type | |
| RepaintsOnScroll | |
| TouchEventHandler | |
| WheelEventHandler | |
| # Sticky position constraints. | |
| type StickyPositionConstraint extends object | |
| properties | |
| # Layout rectangle of the sticky element before being shifted | |
| DOM.Rect stickyBoxRect | |
| # Layout rectangle of the containing block of the sticky element | |
| DOM.Rect containingBlockRect | |
| # The nearest sticky layer that shifts the sticky box | |
| optional LayerId nearestLayerShiftingStickyBox | |
| # The nearest sticky layer that shifts the containing block | |
| optional LayerId nearestLayerShiftingContainingBlock | |
| # Serialized fragment of layer picture along with its offset within the layer. | |
| type PictureTile extends object | |
| properties | |
| # Offset from owning layer left boundary | |
| number x | |
| # Offset from owning layer top boundary | |
| number y | |
| # Base64-encoded snapshot data. | |
| binary picture | |
| # Information about a compositing layer. | |
| type Layer extends object | |
| properties | |
| # The unique id for this layer. | |
| LayerId layerId | |
| # The id of parent (not present for root). | |
| optional LayerId parentLayerId | |
| # The backend id for the node associated with this layer. | |
| optional DOM.BackendNodeId backendNodeId | |
| # Offset from parent layer, X coordinate. | |
| number offsetX | |
| # Offset from parent layer, Y coordinate. | |
| number offsetY | |
| # Layer width. | |
| number width | |
| # Layer height. | |
| number height | |
| # Transformation matrix for layer, default is identity matrix | |
| optional array of number transform | |
| # Transform anchor point X, absent if no transform specified | |
| optional number anchorX | |
| # Transform anchor point Y, absent if no transform specified | |
| optional number anchorY | |
| # Transform anchor point Z, absent if no transform specified | |
| optional number anchorZ | |
| # Indicates how many time this layer has painted. | |
| integer paintCount | |
| # Indicates whether this layer hosts any content, rather than being used for | |
| # transform/scrolling purposes only. | |
| boolean drawsContent | |
| # Set if layer is not visible. | |
| optional boolean invisible | |
| # Rectangles scrolling on main thread only. | |
| optional array of ScrollRect scrollRects | |
| # Sticky position constraint information | |
| optional StickyPositionConstraint stickyPositionConstraint | |
| # Array of timings, one per paint step. | |
| type PaintProfile extends array of number | |
| # Provides the reasons why the given layer was composited. | |
| command compositingReasons | |
| parameters | |
| # The id of the layer for which we want to get the reasons it was composited. | |
| LayerId layerId | |
| returns | |
| # A list of strings specifying reasons for the given layer to become composited. | |
| array of string compositingReasons | |
| # A list of strings specifying reason IDs for the given layer to become composited. | |
| array of string compositingReasonIds | |
| # Disables compositing tree inspection. | |
| command disable | |
| # Enables compositing tree inspection. | |
| command enable | |
| # Returns the snapshot identifier. | |
| command loadSnapshot | |
| parameters | |
| # An array of tiles composing the snapshot. | |
| array of PictureTile tiles | |
| returns | |
| # The id of the snapshot. | |
| SnapshotId snapshotId | |
| # Returns the layer snapshot identifier. | |
| command makeSnapshot | |
| parameters | |
| # The id of the layer. | |
| LayerId layerId | |
| returns | |
| # The id of the layer snapshot. | |
| SnapshotId snapshotId | |
| command profileSnapshot | |
| parameters | |
| # The id of the layer snapshot. | |
| SnapshotId snapshotId | |
| # The maximum number of times to replay the snapshot (1, if not specified). | |
| optional integer minRepeatCount | |
| # The minimum duration (in seconds) to replay the snapshot. | |
| optional number minDuration | |
| # The clip rectangle to apply when replaying the snapshot. | |
| optional DOM.Rect clipRect | |
| returns | |
| # The array of paint profiles, one per run. | |
| array of PaintProfile timings | |
| # Releases layer snapshot captured by the back-end. | |
| command releaseSnapshot | |
| parameters | |
| # The id of the layer snapshot. | |
| SnapshotId snapshotId | |
| # Replays the layer snapshot and returns the resulting bitmap. | |
| command replaySnapshot | |
| parameters | |
| # The id of the layer snapshot. | |
| SnapshotId snapshotId | |
| # The first step to replay from (replay from the very start if not specified). | |
| optional integer fromStep | |
| # The last step to replay to (replay till the end if not specified). | |
| optional integer toStep | |
| # The scale to apply while replaying (defaults to 1). | |
| optional number scale | |
| returns | |
| # A data: URL for resulting image. | |
| string dataURL | |
| # Replays the layer snapshot and returns canvas log. | |
| command snapshotCommandLog | |
| parameters | |
| # The id of the layer snapshot. | |
| SnapshotId snapshotId | |
| returns | |
| # The array of canvas function calls. | |
| array of object commandLog | |
| event layerPainted | |
| parameters | |
| # The id of the painted layer. | |
| LayerId layerId | |
| # Clip rectangle. | |
| DOM.Rect clip | |
| event layerTreeDidChange | |
| parameters | |
| # Layer tree, absent if not in the compositing mode. | |
| optional array of Layer layers | |
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