Attachment 339228 Details for Bug 182995 – Patch

[patch] Patch

bug-182995-20180501150250.patch (text/plain), 51.22 KB, created by Devin Rousso on 2018-05-01 15:03:00 PDT

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Creator: Devin Rousso

Created: 2018-05-01 15:03:00 PDT

Size: 51.22 KB

patch

obsolete

>diff --git a/Source/WebInspectorUI/ChangeLog b/Source/WebInspectorUI/ChangeLog
>index b462072e047ac250c0b4dc80d56c8502c98fa712..475f11d135abd9c4ad227e1822121292bfaacfd1 100644
>--- a/Source/WebInspectorUI/ChangeLog
>+++ b/Source/WebInspectorUI/ChangeLog
>@@ -1,3 +1,77 @@
>+2018-05-01  Devin Rousso  <webkit@devinrousso.com>
>+
>+        Web Inspector: Canvas tab: determine hasVisibleEffect for all actions immediately after recording is added
>+        https://bugs.webkit.org/show_bug.cgi?id=182995
>+
>+        Reviewed by Matt Baker.
>+
>+        Previously, we'd swizzle the entirety of the `WI.Recording` in one, which would usually
>+        freeze the UI, especially for larger recordings. This patch uses `WI.YieldableTask` to split
>+        the work and allow the rest of the UI to still be usable while `WI.Recording` are processing.
>+        Additionally, since we no longer have to worry about hangs, we can do more work upfront,
>+        such as calculating `hasVisibleEffect` and the current state of 2D canvases.
>+
>+        These changes require that all uses of `WI.Recording` call `process()` before attempting to
>+        use any `frames`/`actions`/`initialState`, as they will have their original payload values
>+        and will have not been swizzled or applied.
>+
>+        * Localizations/en.lproj/localizedStrings.js:
>+
>+        * UserInterface/Models/Recording.js:
>+        (WI.Recording):
>+        (WI.Recording.prototype.process):
>+        (WI.Recording.prototype.createContext): Added.
>+        (WI.Recording.prototype.async yieldableTaskWillProcessItem): Added.
>+        (WI.Recording.prototype.async yieldableTaskDidFinish): Added.
>+
>+        * UserInterface/Models/RecordingAction.js:
>+        (WI.RecordingAction):
>+        (WI.RecordingAction.prototype.process): Added.
>+        (WI.RecordingAction.prototype.async swizzle): Added.
>+        (WI.RecordingAction.prototype.apply):
>+        (WI.RecordingAction.prototype.toJSON):
>+        (WI.RecordingAction.prototype.set state): Deleted.
>+        (WI.RecordingAction.prototype.swizzle): Deleted.
>+        (WI.RecordingAction.prototype.apply.getContent): Deleted.
>+        (WI.RecordingAction.prototype.async _swizzle): Deleted.
>+        * UserInterface/Models/RecordingInitialStateAction.js:
>+        (WI.RecordingInitialStateAction):
>+
>+        * UserInterface/Views/CanvasSidebarPanel.js:
>+        (WI.CanvasSidebarPanel):
>+        (WI.CanvasSidebarPanel.prototype.set action):
>+        (WI.CanvasSidebarPanel.prototype._treeOutlineSelectionDidChange):
>+        (WI.CanvasSidebarPanel.prototype._recordingChanged):
>+
>+        * UserInterface/Views/CanvasSidebarPanel.css:
>+        (.sidebar > .panel.navigation.canvas > .content > .recording-content > .indeterminate-progress-spinner):
>+
>+        * UserInterface/Views/RecordingActionTreeElement.js:
>+        (WI.RecordingActionTreeElement):
>+        (WI.RecordingActionTreeElement.prototype.onattach):
>+        (WI.RecordingActionTreeElement.prototype._handleHasVisibleEffectChanged): Deleted.
>+
>+        * UserInterface/Views/RecordingContentView.js:
>+        (WI.RecordingContentView):
>+        (WI.RecordingContentView.prototype.get navigationItems):
>+        (WI.RecordingContentView.prototype.updateActionIndex):
>+        (WI.RecordingContentView.prototype.initialLayout):
>+        (WI.RecordingContentView.prototype._generateContentCanvas2D): Added.
>+        (WI.RecordingContentView.prototype._generateContentCanvasWebGL): Added.
>+        (WI.RecordingContentView.prototype._updateCanvasPath):
>+        (WI.RecordingContentView.prototype._updateProcessProgress): Added.
>+        (WI.RecordingContentView.prototype._handleRecordingProcessedActionSwizzle): Added.
>+        (WI.RecordingContentView.prototype._handleRecordingProcessedActionApply): Added.
>+        (WI.RecordingContentView.supportsCanvasPathDebugging): Deleted.
>+        (WI.RecordingContentView.prototype.async _generateContentCanvas2D): Deleted.
>+        (WI.RecordingContentView.prototype.async _generateContentCanvasWebGL): Deleted.
>+
>+        * UserInterface/Views/RecordingContentView.css:
>+        (.content-view:not(.tab).recording > .preview-container):
>+
>+        * UserInterface/Base/ImageUtilities.js:
>+        (WI.ImageUtilities.supportsCanvasPathDebugging):
>+
> 2018-04-26  Jer Noble  <jer.noble@apple.com>
> 
>         Unreviewed build fix; fix WebInspectorUI copy resources step after r231063.
>diff --git a/Source/WebInspectorUI/Localizations/en.lproj/localizedStrings.js b/Source/WebInspectorUI/Localizations/en.lproj/localizedStrings.js
>index c2e7195f6c75b3aeeb998f15fb02ab24d605d25a..803d9d41e85cb5cd2e84e6958dd2e794d051f16c 100644
>--- a/Source/WebInspectorUI/Localizations/en.lproj/localizedStrings.js
>+++ b/Source/WebInspectorUI/Localizations/en.lproj/localizedStrings.js
>@@ -562,6 +562,7 @@ localizedStrings["Live"] = "Live";
> localizedStrings["Live Size"] = "Live Size";
> localizedStrings["Load \u2014 %s"] = "Load \u2014 %s";
> localizedStrings["Load cancelled"] = "Load cancelled";
>+localizedStrings["Loading Recording"] = "Loading Recording";
> localizedStrings["Local File"] = "Local File";
> localizedStrings["Local Storage"] = "Local Storage";
> localizedStrings["Local Variables"] = "Local Variables";
>@@ -723,6 +724,7 @@ localizedStrings["Probe Expression"] = "Probe Expression";
> localizedStrings["Probe Sample Recorded"] = "Probe Sample Recorded";
> localizedStrings["Probes"] = "Probes";
> localizedStrings["Processing Instruction"] = "Processing Instruction";
>+localizedStrings["Processing Recording"] = "Processing Recording";
> localizedStrings["Program %d"] = "Program %d";
> localizedStrings["Properties"] = "Properties";
> localizedStrings["Property"] = "Property";
>diff --git a/Source/WebInspectorUI/UserInterface/Base/ImageUtilities.js b/Source/WebInspectorUI/UserInterface/Base/ImageUtilities.js
>index fb19b4203413e63a7f9d8d5b4c72ec03ded6b856..0f9f6cced1b4aeb8527bf423cfdf9329b49e7089 100644
>--- a/Source/WebInspectorUI/UserInterface/Base/ImageUtilities.js
>+++ b/Source/WebInspectorUI/UserInterface/Base/ImageUtilities.js
>@@ -126,6 +126,14 @@ WI.ImageUtilities = class ImageUtilities {
>         });
>         return image;
>     }
>+
>+    static supportsCanvasPathDebugging()
>+    {
>+        return "getPath" in CanvasRenderingContext2D.prototype
>+            && "setPath" in CanvasRenderingContext2D.prototype
>+            && "currentX" in CanvasRenderingContext2D.prototype
>+            && "currentY" in CanvasRenderingContext2D.prototype;
>+    }
> };
> 
> WI.ImageUtilities._scratchContext2D = null;
>diff --git a/Source/WebInspectorUI/UserInterface/Models/Recording.js b/Source/WebInspectorUI/UserInterface/Models/Recording.js
>index 58238cdf3f69b004875c7724388d4696a339fe31..23f9fd5d22825aa837f8a722ff4e675d5f7a5e2f 100644
>--- a/Source/WebInspectorUI/UserInterface/Models/Recording.js
>+++ b/Source/WebInspectorUI/UserInterface/Models/Recording.js
>@@ -23,10 +23,12 @@
>  * THE POSSIBILITY OF SUCH DAMAGE.
>  */
> 
>-WI.Recording = class Recording
>+WI.Recording = class Recording extends WI.Object
> {
>     constructor(version, type, initialState, frames, data)
>     {
>+        super();
>+
>         this._version = version;
>         this._type = type;
>         this._initialState = initialState;
>@@ -35,37 +37,14 @@ WI.Recording = class Recording
>         this._displayName = WI.UIString("Recording");
> 
>         this._swizzle = [];
>+        this._actions = [new WI.RecordingInitialStateAction].concat(...this._frames.map((frame) => frame.actions));
>         this._visualActionIndexes = [];
>         this._source = null;
> 
>-        let actions = [new WI.RecordingInitialStateAction].concat(...this._frames.map((frame) => frame.actions));
>-        this._actions = Promise.all(actions.map((action) => action.swizzle(this))).then(() => {
>-            actions.forEach((action, index) => {
>-                if (!action.valid)
>-                    return;
>-
>-                let prototype = null;
>-                if (this._type === WI.Recording.Type.Canvas2D)
>-                    prototype = CanvasRenderingContext2D.prototype;
>-                else if (this._type === WI.Recording.Type.CanvasWebGL)
>-                    prototype = WebGLRenderingContext.prototype;
>-
>-                if (prototype) {
>-                    let validName = action.name in prototype;
>-                    let validFunction = !action.isFunction || typeof prototype[action.name] === "function";
>-                    if (!validName || !validFunction) {
>-                        action.markInvalid();
>-
>-                        WI.Recording.synthesizeError(WI.UIString("â%sâ is invalid.").format(this._name));
>-                    }
>-                }
>-
>-                if (action.isVisual)
>-                    this._visualActionIndexes.push(index);
>-            });
>-
>-            return actions;
>-        });
>+        this._swizzleTask = null;
>+        this._applyTask = null;
>+        this._processContext = null;
>+        this._processPromise = null;
>     }
> 
>     static fromPayload(payload, frames)
>@@ -177,13 +156,26 @@ WI.Recording = class Recording
>     get initialState() { return this._initialState; }
>     get frames() { return this._frames; }
>     get data() { return this._data; }
>-    get visualActionIndexes() { return this._visualActionIndexes; }
>-
>     get actions() { return this._actions; }
>+    get visualActionIndexes() { return this._visualActionIndexes; }
> 
>     get source() { return this._source; }
>     set source(source) { this._source = source; }
> 
>+    process()
>+    {
>+        if (!this._processPromise) {
>+            this._processPromise = new WI.WrappedPromise;
>+
>+            let items = this._actions.map((action, index) => { return {action, index} });
>+            this._swizzleTask = new WI.YieldableTask(this, items);
>+            this._applyTask = new WI.YieldableTask(this, items);
>+
>+            this._swizzleTask.start();
>+        }
>+        return this._processPromise.promise;
>+    }
>+
>     createDisplayName(suggestedName)
>     {
>         let recordingNameSet;
>@@ -300,6 +292,27 @@ WI.Recording = class Recording
>         return this._swizzle[index][type];
>     }
> 
>+    createContext()
>+    {
>+        let createCanvasContext = (type) => {
>+            let canvas = document.createElement("canvas");
>+            if ("width" in this._initialState.attributes)
>+                canvas.width = this._initialState.attributes.width;
>+            if ("height" in this._initialState.attributes)
>+                canvas.height = this._initialState.attributes.height;
>+            return canvas.getContext(type, ...this._initialState.parameters);
>+        };
>+
>+        if (this._type === WI.Recording.Type.Canvas2D)
>+            return createCanvasContext("2d");
>+
>+        if (this._type === WI.Recording.Type.CanvasWebGL)
>+            return createCanvasContext("webgl");
>+
>+        console.error("Unknown recording type", this._type);
>+        return null;
>+    }
>+
>     toJSON()
>     {
>         let initialState = {};
>@@ -318,6 +331,99 @@ WI.Recording = class Recording
>             data: this._data,
>         };
>     }
>+
>+    // YieldableTask delegate
>+
>+    async yieldableTaskWillProcessItem(task, item)
>+    {
>+        if (task === this._swizzleTask) {
>+            await item.action.swizzle(this);
>+
>+            this.dispatchEventToListeners(WI.Recording.Event.ProcessedActionSwizzle, {index: item.index});
>+        } else if (task === this._applyTask) {
>+            item.action.process(this, this._processContext);
>+
>+            if (item.action.isVisual)
>+                this._visualActionIndexes.push(item.index);
>+
>+            this.dispatchEventToListeners(WI.Recording.Event.ProcessedActionApply, {index: item.index});
>+        }
>+    }
>+
>+    async yieldableTaskDidFinish(task)
>+    {
>+        if (task === this._swizzleTask) {
>+            this._swizzleTask = null;
>+
>+            this._processContext = this.createContext();
>+
>+            if (this._type === WI.Recording.Type.Canvas2D) {
>+                let initialContent = await WI.ImageUtilities.promisifyLoad(this._initialState.content);
>+                this._processContext.drawImage(initialContent, 0, 0);
>+
>+                for (let [key, value] of Object.entries(this._initialState.attributes)) {
>+                    switch (key) {
>+                    case "setTransform":
>+                        value = [await this.swizzle(value, WI.Recording.Swizzle.DOMMatrix)];
>+                        break;
>+
>+                    case "fillStyle":
>+                    case "strokeStyle":
>+                            let [gradient, pattern, string] = await Promise.all([
>+                                this.swizzle(value, WI.Recording.Swizzle.CanvasGradient),
>+                                this.swizzle(value, WI.Recording.Swizzle.CanvasPattern),
>+                                this.swizzle(value, WI.Recording.Swizzle.String),
>+                            ]);
>+                            if (gradient && !pattern)
>+                                value = gradient;
>+                            else if (pattern && !gradient)
>+                                value = pattern;
>+                            else
>+                                value = string;
>+                        break;
>+
>+                    case "direction":
>+                    case "font":
>+                    case "globalCompositeOperation":
>+                    case "imageSmoothingEnabled":
>+                    case "imageSmoothingQuality":
>+                    case "lineCap":
>+                    case "lineJoin":
>+                    case "shadowColor":
>+                    case "textAlign":
>+                    case "textBaseline":
>+                        value = await this.swizzle(value, WI.Recording.Swizzle.String);
>+                        break;
>+
>+                    case "setPath":
>+                        value = [await this.swizzle(value[0], WI.Recording.Swizzle.Path2D)];
>+                        break;
>+                    }
>+
>+                    if (value === undefined || (Array.isArray(value) && value.includes(undefined)))
>+                        continue;
>+
>+                    try {
>+                        if (WI.RecordingAction.isFunctionForType(this._type, key))
>+                            this._processContext[key](...value);
>+                        else
>+                            this._processContext[key] = value;
>+                    } catch { }
>+                }
>+            }
>+
>+            this._applyTask.start();
>+        } else if (task === this._applyTask) {
>+            this._applyTask = null;
>+            this._processContext = null;
>+            this._processPromise.resolve();
>+        }
>+    }
>+};
>+
>+WI.Recording.Event = {
>+    ProcessedActionApply: "recording-processed-action-apply",
>+    ProcessedActionSwizzle: "recording-processed-action-swizzle",
> };
> 
> WI.Recording._importedRecordingNameSet = new Set;
>diff --git a/Source/WebInspectorUI/UserInterface/Models/RecordingAction.js b/Source/WebInspectorUI/UserInterface/Models/RecordingAction.js
>index 27db60f4d1a42babd748c338d16cd3643a5a3ee8..404c30199ccd4283ff9313caee1b3ede5914f134 100644
>--- a/Source/WebInspectorUI/UserInterface/Models/RecordingAction.js
>+++ b/Source/WebInspectorUI/UserInterface/Models/RecordingAction.js
>@@ -41,12 +41,12 @@ WI.RecordingAction = class RecordingAction extends WI.Object
>         this._snapshot = "";
> 
>         this._valid = true;
>-        this._swizzledPromise = null;
>-
>         this._isFunction = false;
>         this._isGetter = false;
>         this._isVisual = false;
>         this._hasVisibleEffect = undefined;
>+
>+        this._state = null;
>         this._stateModifiers = new Set;
>     }
> 
>@@ -97,31 +97,19 @@ WI.RecordingAction = class RecordingAction extends WI.Object
>     get isGetter() { return this._isGetter; }
>     get isVisual() { return this._isVisual; }
>     get hasVisibleEffect() { return this._hasVisibleEffect; }
>-    get stateModifiers() { return this._stateModifiers; }
>-
>     get state() { return this._state; }
>-    set state(state) { this._state = state; }
>-
>-    markInvalid()
>-    {
>-        let wasValid = this._valid;
>-        this._valid = false;
>-
>-        if (wasValid)
>-            this.dispatchEventToListeners(WI.RecordingAction.Event.ValidityChanged);
>-    }
>-
>-    swizzle(recording)
>-    {
>-        if (!this._swizzledPromise)
>-            this._swizzledPromise = this._swizzle(recording);
>-        return this._swizzledPromise;
>-    }
>+    get stateModifiers() { return this._stateModifiers; }
> 
>-    apply(context, options = {})
>+    process(recording, context)
>     {
>-        if (!this.valid)
>+        if (recording.type === WI.Recording.Type.CanvasWebGL) {
>+            // We add each RecordingAction to the list of visualActionIndexes after it is processed.
>+            if (this._valid && this._isVisual) {
>+                let contentBefore = recording.visualActionIndexes.length ? recording.visualActionIndexes.lastValue.snapshot : recording.initialState.content;
>+                this._hasVisibleEffect = this._snapshot !== contentBefore;
>+            }
>             return;
>+        }
> 
>         function getContent() {
>             if (context instanceof CanvasRenderingContext2D) {
>@@ -143,45 +131,56 @@ WI.RecordingAction = class RecordingAction extends WI.Object
>         }
> 
>         let contentBefore = null;
>-        let shouldCheckForChange = this._isVisual && this._hasVisibleEffect === undefined;
>-        if (shouldCheckForChange)
>+        if (this._valid && this._isVisual)
>             contentBefore = getContent();
> 
>-        try {
>-            let name = options.nameOverride || this._name;
>-            if (this.isFunction)
>-                context[name](...this._parameters);
>-            else {
>-                if (this.isGetter)
>-                    context[name];
>-                else
>-                    context[name] = this._parameters[0];
>-            }
>-
>-            if (shouldCheckForChange) {
>-                this._hasVisibleEffect = !Array.shallowEqual(contentBefore, getContent());
>-                if (!this._hasVisibleEffect)
>-                    this.dispatchEventToListeners(WI.RecordingAction.Event.HasVisibleEffectChanged);
>-            }
>-        } catch {
>-            this.markInvalid();
>-
>-            WI.Recording.synthesizeError(WI.UIString("â%sâ threw an error.").format(this._name));
>+        this.apply(context);
>+
>+        if (this._valid && this._isVisual)
>+            this._hasVisibleEffect = !Array.shallowEqual(contentBefore, getContent());
>+
>+        if (recording.type === WI.Recording.Type.Canvas2D) {
>+            let matrix = context.getTransform();
>+
>+            this._state = {
>+                currentX: context.currentX,
>+                currentY: context.currentY,
>+                direction: context.direction,
>+                fillStyle: context.fillStyle,
>+                font: context.font,
>+                globalAlpha: context.globalAlpha,
>+                globalCompositeOperation: context.globalCompositeOperation,
>+                imageSmoothingEnabled: context.imageSmoothingEnabled,
>+                imageSmoothingQuality: context.imageSmoothingQuality,
>+                lineCap: context.lineCap,
>+                lineDash: context.getLineDash(),
>+                lineDashOffset: context.lineDashOffset,
>+                lineJoin: context.lineJoin,
>+                lineWidth: context.lineWidth,
>+                miterLimit: context.miterLimit,
>+                shadowBlur: context.shadowBlur,
>+                shadowColor: context.shadowColor,
>+                shadowOffsetX: context.shadowOffsetX,
>+                shadowOffsetY: context.shadowOffsetY,
>+                strokeStyle: context.strokeStyle,
>+                textAlign: context.textAlign,
>+                textBaseline: context.textBaseline,
>+                transform: [matrix.a, matrix.b, matrix.c, matrix.d, matrix.e, matrix.f],
>+                webkitImageSmoothingEnabled: context.webkitImageSmoothingEnabled,
>+                webkitLineDash: context.webkitLineDash,
>+                webkitLineDashOffset: context.webkitLineDashOffset,
>+            };
>+
>+            if (WI.ImageUtilities.supportsCanvasPathDebugging())
>+                this._state.setPath = [context.getPath()];
>         }
>     }
> 
>-    toJSON()
>+    async swizzle(recording)
>     {
>-        let json = [this._payloadName, this._payloadParameters, this._payloadSwizzleTypes, this._payloadTrace];
>-        if (this._payloadSnapshot >= 0)
>-            json.push(this._payloadSnapshot);
>-        return json;
>-    }
>-
>-    // Private
>+        if (!this._valid)
>+            return;
> 
>-    async _swizzle(recording)
>-    {
>         let swizzleParameter = (item, index) => {
>             return recording.swizzle(item, this._payloadSwizzleTypes[index]);
>         };
>@@ -215,6 +214,30 @@ WI.RecordingAction = class RecordingAction extends WI.Object
>         if (this._payloadSnapshot >= 0)
>             this._snapshot = snapshot;
> 
>+        this._isFunction = WI.RecordingAction.isFunctionForType(recording.type, this._name);
>+        this._isGetter = !this._isFunction && !this._parameters.length;
>+
>+        let visualNames = WI.RecordingAction._visualNames[recording.type];
>+        this._isVisual = visualNames ? visualNames.has(this._name) : false;
>+
>+        if (this._valid) {
>+            let prototype = null;
>+            if (recording.type === WI.Recording.Type.Canvas2D)
>+                prototype = CanvasRenderingContext2D.prototype;
>+            else if (recording.type === WI.Recording.Type.CanvasWebGL)
>+                prototype = WebGLRenderingContext.prototype;
>+
>+            if (prototype) {
>+                let validName = name in prototype;
>+                let validFunction = !this._isFunction || typeof prototype[name] === "function";
>+                if (!validName || !validFunction) {
>+                    this.markInvalid();
>+
>+                    WI.Recording.synthesizeError(WI.UIString("â%sâ is invalid.").format(name));
>+                }
>+            }
>+        }
>+
>         if (this._valid) {
>             let parametersSpecified = this._parameters.every((parameter) => parameter !== undefined);
>             let parametersCanBeSwizzled = this._payloadSwizzleTypes.every((swizzleType) => swizzleType !== WI.Recording.Swizzle.None);
>@@ -222,21 +245,49 @@ WI.RecordingAction = class RecordingAction extends WI.Object
>                 this.markInvalid();
>         }
> 
>-        this._isFunction = WI.RecordingAction.isFunctionForType(recording.type, this._name);
>-        this._isGetter = !this._isFunction && !this._parameters.length;
>+        if (this._valid) {
>+            let stateModifiers = WI.RecordingAction._stateModifiers[recording.type];
>+            if (stateModifiers) {
>+                this._stateModifiers.add(this._name);
>+                let modifiedByAction = stateModifiers[this._name] || [];
>+                for (let item of modifiedByAction)
>+                    this._stateModifiers.add(item);
>+            }
>+        }
>+    }
> 
>-        let visualNames = WI.RecordingAction._visualNames[recording.type];
>-        this._isVisual = visualNames ? visualNames.has(this._name) : false;
>+    apply(context, options = {})
>+    {
>+        if (!this.valid)
>+            return;
> 
>-        this._stateModifiers = new Set([this._name]);
>-        let stateModifiers = WI.RecordingAction._stateModifiers[recording.type];
>-        if (stateModifiers) {
>-            let modifiedByAction = stateModifiers[this._name] || [];
>-            for (let item of modifiedByAction)
>-                this._stateModifiers.add(item);
>+        try {
>+            let name = options.nameOverride || this._name;
>+            if (this.isFunction)
>+                context[name](...this._parameters);
>+            else {
>+                if (this.isGetter)
>+                    context[name];
>+                else
>+                    context[name] = this._parameters[0];
>+            }
>+        } catch {
>+            this.markInvalid();
>+
>+            WI.Recording.synthesizeError(WI.UIString("â%sâ threw an error.").format(this._name));
>         }
>     }
> 
>+    markInvalid()
>+    {
>+        if (!this._valid)
>+            return;
>+
>+        this._valid = false;
>+
>+        this.dispatchEventToListeners(WI.RecordingAction.Event.ValidityChanged);
>+    }
>+
>     getColorParameters()
>     {
>         switch (this._name) {
>@@ -277,6 +328,14 @@ WI.RecordingAction = class RecordingAction extends WI.Object
> 
>         return [];
>     }
>+
>+    toJSON()
>+    {
>+        let json = [this._payloadName, this._payloadParameters, this._payloadSwizzleTypes, this._payloadTrace];
>+        if (this._payloadSnapshot >= 0)
>+            json.push(this._payloadSnapshot);
>+        return json;
>+    }
> };
> 
> WI.RecordingAction.Event = {
>@@ -310,6 +369,7 @@ WI.RecordingAction._functionNames = {
>         "fillText",
>         "getImageData",
>         "getLineDash",
>+        "getPath",
>         "isPointInPath",
>         "isPointInPath",
>         "isPointInStroke",
>@@ -333,6 +393,7 @@ WI.RecordingAction._functionNames = {
>         "setLineJoin",
>         "setLineWidth",
>         "setMiterLimit",
>+        "setPath",
>         "setShadow",
>         "setStrokeColor",
>         "setTransform",
>diff --git a/Source/WebInspectorUI/UserInterface/Models/RecordingInitialStateAction.js b/Source/WebInspectorUI/UserInterface/Models/RecordingInitialStateAction.js
>index 8bc518e63733048ce84d6a6a9938139a3414bfb2..d5498542246f8c77cdce91282b644751ca164f0c 100644
>--- a/Source/WebInspectorUI/UserInterface/Models/RecordingInitialStateAction.js
>+++ b/Source/WebInspectorUI/UserInterface/Models/RecordingInitialStateAction.js
>@@ -32,6 +32,5 @@ WI.RecordingInitialStateAction = class RecordingInitialStateAction extends WI.Re
>         this._name = WI.UIString("Initial State");
> 
>         this._valid = false;
>-        this._swizzledPromise = Promise.resolve();
>     }
> };
>diff --git a/Source/WebInspectorUI/UserInterface/Views/CanvasSidebarPanel.css b/Source/WebInspectorUI/UserInterface/Views/CanvasSidebarPanel.css
>index 3ea897f62ba6fd5f998ad4cefaa15cbf7f874ab8..cab3dbc1f92ed909d9d0d3e967ee9a2df0c0a9cd 100644
>--- a/Source/WebInspectorUI/UserInterface/Views/CanvasSidebarPanel.css
>+++ b/Source/WebInspectorUI/UserInterface/Views/CanvasSidebarPanel.css
>@@ -71,3 +71,7 @@
> .sidebar > .panel.navigation.canvas > .content > .recording-content > .tree-outline .item.folder-icon > .status {
>     line-height: 16px;
> }
>+
>+.sidebar > .panel.navigation.canvas > .content > .recording-content > .indeterminate-progress-spinner {
>+    margin: 16px auto;
>+}
>diff --git a/Source/WebInspectorUI/UserInterface/Views/CanvasSidebarPanel.js b/Source/WebInspectorUI/UserInterface/Views/CanvasSidebarPanel.js
>index 440dd6e822a49fdc983f54ad0a086405a39fc9f6..67fc08d2bd17127d9d05a26a63dbd64ef11c412b 100644
>--- a/Source/WebInspectorUI/UserInterface/Views/CanvasSidebarPanel.js
>+++ b/Source/WebInspectorUI/UserInterface/Views/CanvasSidebarPanel.js
>@@ -52,20 +52,23 @@ WI.CanvasSidebarPanel = class CanvasSidebarPanel extends WI.NavigationSidebarPan
>         this._recordingNavigationBar.element.classList.add("hidden");
>         this.contentView.addSubview(this._recordingNavigationBar);
> 
>-        let recordingContent = this.contentView.element.appendChild(document.createElement("div"));
>-        recordingContent.className = "recording-content";
>+        this._recordingContentContainer = this.contentView.element.appendChild(document.createElement("div"));
>+        this._recordingContentContainer.className = "recording-content";
> 
>         this._recordingTreeOutline = this.contentTreeOutline;
>-        recordingContent.appendChild(this._recordingTreeOutline.element);
>+        this._recordingContentContainer.appendChild(this._recordingTreeOutline.element);
> 
>         this._recordingTreeOutline.customIndent = true;
>-        this._recordingTreeOutline.registerScrollVirtualizer(recordingContent, 20);
>+        this._recordingTreeOutline.registerScrollVirtualizer(this._recordingContentContainer, 20);
> 
>         this._canvasTreeOutline.addEventListener(WI.TreeOutline.Event.SelectionDidChange, this._treeOutlineSelectionDidChange, this);
>         this._recordingTreeOutline.addEventListener(WI.TreeOutline.Event.SelectionDidChange, this._treeOutlineSelectionDidChange, this);
> 
>         WI.canvasManager.addEventListener(WI.CanvasManager.Event.RecordingStarted, this._updateRecordNavigationItem, this);
>         WI.canvasManager.addEventListener(WI.CanvasManager.Event.RecordingStopped, this._updateRecordNavigationItem, this);
>+
>+        this._recordingProcessPromise = null;
>+        this._recordingProcessSpinner = null;
>     }
> 
>     // Public
>@@ -108,7 +111,7 @@ WI.CanvasSidebarPanel = class CanvasSidebarPanel extends WI.NavigationSidebarPan
> 
>     set action(action)
>     {
>-        if (!this._recording)
>+        if (!this._recording || this._recordingProcessPromise)
>             return;
> 
>         let selectedTreeElement = this._recordingTreeOutline.selectedTreeElement;
>@@ -286,7 +289,8 @@ WI.CanvasSidebarPanel = class CanvasSidebarPanel extends WI.NavigationSidebarPan
>         console.assert(this._recording, "Missing recording for action tree element.", treeElement);
>         this._recording[WI.CanvasSidebarPanel.SelectedActionSymbol] = treeElement.representedObject;
> 
>-        let recordingContentView = this.contentBrowser.showContentViewForRepresentedObject(this._recording);
>+        const onlyExisting = true;
>+        let recordingContentView = this.contentBrowser.contentViewForRepresentedObject(this._recording, onlyExisting);
>         if (recordingContentView)
>             recordingContentView.updateActionIndex(treeElement.index);
>     }
>@@ -327,16 +331,28 @@ WI.CanvasSidebarPanel = class CanvasSidebarPanel extends WI.NavigationSidebarPan
>         if (!this._recording)
>             return;
> 
>+        if (!this._recordingProcessSpinner) {
>+            this._recordingProcessSpinner = new WI.IndeterminateProgressSpinner;
>+            this._recordingContentContainer.appendChild(this._recordingProcessSpinner.element);
>+        }
>+
>+        this.contentBrowser.showContentViewForRepresentedObject(this._recording);
>+
>         let recording = this._recording;
> 
>-        this._recording.actions.then((actions) => {
>-            if (recording !== this._recording)
>+        let promise = this._recording.process().then(() => {
>+            if (recording !== this._recording || promise !== this._recordingProcessPromise)
>                 return;
> 
>-            this._recordingTreeOutline.element.dataset.indent = Number.countDigits(actions.length);
>+            if (this._recordingProcessSpinner) {
>+                this._recordingProcessSpinner.element.remove();
>+                this._recordingProcessSpinner = null;
>+            }
>+
>+            this._recordingTreeOutline.element.dataset.indent = Number.countDigits(this._recording.actions.length);
> 
>-            if (actions[0] instanceof WI.RecordingInitialStateAction)
>-                this._recordingTreeOutline.appendChild(new WI.RecordingActionTreeElement(actions[0], 0, this._recording.type));
>+            if (this._recording.actions[0] instanceof WI.RecordingInitialStateAction)
>+                this._recordingTreeOutline.appendChild(new WI.RecordingActionTreeElement(this._recording.actions[0], 0, this._recording.type));
> 
>             let cumulativeActionIndex = 1;
>             this._recording.frames.forEach((frame, frameIndex) => {
>@@ -366,8 +382,12 @@ WI.CanvasSidebarPanel = class CanvasSidebarPanel extends WI.NavigationSidebarPan
>                 scopeBarItem.selected = true;
>             }
> 
>-            this.action = this._recording[WI.CanvasSidebarPanel.SelectedActionSymbol] || actions[0];
>+            this.action = this._recording[WI.CanvasSidebarPanel.SelectedActionSymbol] || this._recording.actions[0];
>+
>+            this._recordingProcessPromise = null;
>         });
>+
>+        this._recordingProcessPromise = promise;
>     }
> 
>     _updateRecordNavigationItem()
>diff --git a/Source/WebInspectorUI/UserInterface/Views/RecordingActionTreeElement.js b/Source/WebInspectorUI/UserInterface/Views/RecordingActionTreeElement.js
>index 13353a39d8eb24b61117d09550063e30e3e03cc2..68d18f0568ef5b2824cf57b375aa1161d1525a32 100644
>--- a/Source/WebInspectorUI/UserInterface/Views/RecordingActionTreeElement.js
>+++ b/Source/WebInspectorUI/UserInterface/Views/RecordingActionTreeElement.js
>@@ -39,7 +39,6 @@ WI.RecordingActionTreeElement = class RecordingActionTreeElement extends WI.Gene
>         this._copyText = copyText;
> 
>         this.representedObject.addEventListener(WI.RecordingAction.Event.ValidityChanged, this._handleValidityChanged, this);
>-        this.representedObject.addEventListener(WI.RecordingAction.Event.HasVisibleEffectChanged, this._handleHasVisibleEffectChanged, this);
>     }
> 
>     // Static
>@@ -399,6 +398,13 @@ WI.RecordingActionTreeElement = class RecordingActionTreeElement extends WI.Gene
>         super.onattach();
> 
>         this.element.dataset.index = this._index.toLocaleString();
>+
>+        if (this.representedObject.valid && this.representedObject.isVisual && !this.representedObject.hasVisibleEffect) {
>+            this.addClassName("no-visible-effect");
>+
>+            const title = WI.UIString("This action causes no visual change");
>+            this.status = WI.ImageUtilities.useSVGSymbol("Images/Warning.svg", "warning", title);
>+        }
>     }
> 
>     populateContextMenu(contextMenu, event)
>@@ -430,14 +436,6 @@ WI.RecordingActionTreeElement = class RecordingActionTreeElement extends WI.Gene
>     {
>         this.addClassName("invalid");
>     }
>-
>-    _handleHasVisibleEffectChanged(event)
>-    {
>-        this.addClassName("no-visible-effect");
>-
>-        this.status = WI.ImageUtilities.useSVGSymbol("Images/Warning.svg", "warning");
>-        this.status.title = WI.UIString("This action causes no visual change");
>-    }
> };
> 
> WI.RecordingActionTreeElement._memoizedActionClassNames = new Map;
>diff --git a/Source/WebInspectorUI/UserInterface/Views/RecordingContentView.css b/Source/WebInspectorUI/UserInterface/Views/RecordingContentView.css
>index d224b3822b1660a27439f24d266f8ed3b640bb36..7c9b4aa9a8c307391c6bf0c630cdf46a9caa34cb 100644
>--- a/Source/WebInspectorUI/UserInterface/Views/RecordingContentView.css
>+++ b/Source/WebInspectorUI/UserInterface/Views/RecordingContentView.css
>@@ -67,6 +67,9 @@
>     flex: 1;
>     justify-content: center;
>     align-items: center;
>+    position: relative;
>+    width: -webkit-fill-available;
>+    height: -webkit-fill-available;
> }
> 
> .content-view:not(.tab).recording :matches(img, canvas) {
>diff --git a/Source/WebInspectorUI/UserInterface/Views/RecordingContentView.js b/Source/WebInspectorUI/UserInterface/Views/RecordingContentView.js
>index f0ea4653f2e54400cbc7a6fab07d02bcfec74ad6..97d6c7b9650961504555a137792c6ce6e58e9936 100644
>--- a/Source/WebInspectorUI/UserInterface/Views/RecordingContentView.js
>+++ b/Source/WebInspectorUI/UserInterface/Views/RecordingContentView.js
>@@ -42,7 +42,7 @@ WI.RecordingContentView = class RecordingContentView extends WI.ContentView
>         let isCanvas2D = this.representedObject.type === WI.Recording.Type.Canvas2D;
>         let isCanvasWebGL = this.representedObject.type === WI.Recording.Type.CanvasWebGL;
>         if (isCanvas2D || isCanvasWebGL) {
>-            if (isCanvas2D && WI.RecordingContentView.supportsCanvasPathDebugging()) {
>+            if (isCanvas2D && WI.ImageUtilities.supportsCanvasPathDebugging()) {
>                 this._pathContext = null;
> 
>                 this._showPathButtonNavigationItem = new WI.ActivateButtonNavigationItem("show-path", WI.UIString("Show Path"), WI.UIString("Hide Path"), "Images/Path.svg", 16, 16);
>@@ -61,15 +61,13 @@ WI.RecordingContentView = class RecordingContentView extends WI.ContentView
>             this._exportButtonNavigationItem.visibilityPriority = WI.NavigationItem.VisibilityPriority.High;
>             this._exportButtonNavigationItem.addEventListener(WI.ButtonNavigationItem.Event.Clicked, () => { this._exportRecording(); });
>         }
>+
>+        this._processing = true;
>+        this._processMessageTextView = null;
>     }
> 
>     // Static
> 
>-    static supportsCanvasPathDebugging()
>-    {
>-        return "currentX" in CanvasRenderingContext2D.prototype && "currentY" in CanvasRenderingContext2D.prototype;
>-    }
>-
>     static _actionModifiesPath(recordingAction)
>     {
>         switch (recordingAction.name) {
>@@ -99,7 +97,7 @@ WI.RecordingContentView = class RecordingContentView extends WI.ContentView
>             return [];
> 
>         let navigationItems = [this._exportButtonNavigationItem, new WI.DividerNavigationItem];
>-        if (isCanvas2D && WI.RecordingContentView.supportsCanvasPathDebugging())
>+        if (isCanvas2D && WI.ImageUtilities.supportsCanvasPathDebugging())
>             navigationItems.push(this._showPathButtonNavigationItem);
> 
>         navigationItems.push(this._showGridButtonNavigationItem);
>@@ -119,19 +117,25 @@ WI.RecordingContentView = class RecordingContentView extends WI.ContentView
>         if (this._index === index)
>             return;
> 
>-        this.representedObject.actions.then((actions) => {
>-            console.assert(index >= 0 && index < actions.length);
>-            if (index < 0 || index >= actions.length)
>-                return;
>+        console.assert(index >= 0 && index < this.representedObject.actions.length);
>+        if (index < 0 || index >= this.representedObject.actions.length)
>+            return;
> 
>-            this._index = index;
>-            this._updateSliderValue();
>+        this._index = index;
> 
>-            if (this.representedObject.type === WI.Recording.Type.Canvas2D)
>-                this._throttler._generateContentCanvas2D(index, actions);
>-            else if (this.representedObject.type === WI.Recording.Type.CanvasWebGL)
>-                this._throttler._generateContentCanvasWebGL(index, actions);
>-        });
>+        if (this._processing)
>+            return;
>+
>+        this._updateSliderValue();
>+
>+        if (this.representedObject.type === WI.Recording.Type.Canvas2D)
>+            this._throttler._generateContentCanvas2D(index);
>+        else if (this.representedObject.type === WI.Recording.Type.CanvasWebGL)
>+            this._throttler._generateContentCanvasWebGL(index);
>+
>+        this._action = this.representedObject.actions[this._index];
>+
>+        this.dispatchEventToListeners(WI.ContentView.Event.SupplementalRepresentedObjectsDidChange);
>     }
> 
>     shown()
>@@ -188,10 +192,24 @@ WI.RecordingContentView = class RecordingContentView extends WI.ContentView
>         this._sliderElement.min = 0;
>         this._sliderElement.max = 0;
> 
>-        this.representedObject.actions.then(() => {
>+        this.representedObject.addEventListener(WI.Recording.Event.ProcessedActionSwizzle, this._handleRecordingProcessedActionSwizzle, this);
>+        this.representedObject.addEventListener(WI.Recording.Event.ProcessedActionApply, this._handleRecordingProcessedActionApply, this);
>+
>+        this.representedObject.process().then(() => {
>+            if (this._processMessageTextView)
>+                this._processMessageTextView.remove();
>+
>             sliderContainer.classList.remove("hidden");
>             this._sliderElement.max = this.representedObject.visualActionIndexes.length;
>             this._updateSliderValue();
>+
>+            this._processing = false;
>+
>+            let index = this._index;
>+            if (!isNaN(index)) {
>+                this._index = NaN;
>+                this.updateActionIndex(index);
>+            }
>         });
>     }
> 
>@@ -214,14 +232,14 @@ WI.RecordingContentView = class RecordingContentView extends WI.ContentView
>         });
>     }
> 
>-    async _generateContentCanvas2D(index, actions)
>+    _generateContentCanvas2D(index)
>     {
>         let imageLoad = (event) => {
>             // Loading took too long and the current action index has already changed.
>             if (index !== this._index)
>                 return;
> 
>-            this._generateContentCanvas2D(index, actions);
>+            this._generateContentCanvas2D(index);
>         };
> 
>         let initialState = this.representedObject.initialState;
>@@ -235,9 +253,11 @@ WI.RecordingContentView = class RecordingContentView extends WI.ContentView
>         let snapshotIndex = Math.floor(index / WI.RecordingContentView.SnapshotInterval);
>         let snapshot = this._snapshots[snapshotIndex];
> 
>-        let showCanvasPath = WI.RecordingContentView.supportsCanvasPathDebugging() && WI.settings.showCanvasPath.value;
>+        let showCanvasPath = WI.ImageUtilities.supportsCanvasPathDebugging() && WI.settings.showCanvasPath.value;
>         let indexOfLastBeginPathAction = Infinity;
> 
>+        let actions = this.representedObject.actions;
>+
>         let applyActions = (from, to, callback) => {
>             let saveCount = 0;
>             snapshot.context.save();
>@@ -331,43 +351,9 @@ WI.RecordingContentView = class RecordingContentView extends WI.ContentView
>             } else if (this._pathContext)
>                 this._pathContext.canvas.remove();
> 
>-            let state = {
>-                currentX: snapshot.context.currentX,
>-                currentY: snapshot.context.currentY,
>-                direction: snapshot.context.direction,
>-                fillStyle: snapshot.context.fillStyle,
>-                font: snapshot.context.font,
>-                globalAlpha: snapshot.context.globalAlpha,
>-                globalCompositeOperation: snapshot.context.globalCompositeOperation,
>-                imageSmoothingEnabled: snapshot.context.imageSmoothingEnabled,
>-                imageSmoothingQuality: snapshot.context.imageSmoothingQuality,
>-                lineCap: snapshot.context.lineCap,
>-                lineDash: snapshot.context.getLineDash(),
>-                lineDashOffset: snapshot.context.lineDashOffset,
>-                lineJoin: snapshot.context.lineJoin,
>-                lineWidth: snapshot.context.lineWidth,
>-                miterLimit: snapshot.context.miterLimit,
>-                shadowBlur: snapshot.context.shadowBlur,
>-                shadowColor: snapshot.context.shadowColor,
>-                shadowOffsetX: snapshot.context.shadowOffsetX,
>-                shadowOffsetY: snapshot.context.shadowOffsetY,
>-                strokeStyle: snapshot.context.strokeStyle,
>-                textAlign: snapshot.context.textAlign,
>-                textBaseline: snapshot.context.textBaseline,
>-                transform: snapshot.context.getTransform(),
>-                webkitImageSmoothingEnabled: snapshot.context.webkitImageSmoothingEnabled,
>-                webkitLineDash: snapshot.context.webkitLineDash,
>-                webkitLineDashOffset: snapshot.context.webkitLineDashOffset,
>-            };
>-
>-            if (WI.RecordingContentView.supportsCanvasPathDebugging())
>-                state.setPath = [snapshot.context.getPath()];
>-
>             snapshot.context.restore();
>             while (saveCount-- > 0)
>                 snapshot.context.restore();
>-
>-            return state;
>         };
> 
>         if (!snapshot) {
>@@ -376,12 +362,8 @@ WI.RecordingContentView = class RecordingContentView extends WI.ContentView
>             while (snapshot.index && actions[snapshot.index].name !== "beginPath")
>                 --snapshot.index;
> 
>-            snapshot.element = document.createElement("canvas");
>-            snapshot.context = snapshot.element.getContext("2d", ...initialState.parameters);
>-            if ("width" in initialState.attributes)
>-                snapshot.element.width = initialState.attributes.width;
>-            if ("height" in initialState.attributes)
>-                snapshot.element.height = initialState.attributes.height;
>+            snapshot.context = this.representedObject.createContext();
>+            snapshot.element = snapshot.context.canvas;
> 
>             let lastSnapshotIndex = snapshotIndex;
>             while (--lastSnapshotIndex >= 0) {
>@@ -392,58 +374,16 @@ WI.RecordingContentView = class RecordingContentView extends WI.ContentView
>             let startIndex = 0;
>             if (lastSnapshotIndex < 0) {
>                 snapshot.content = this._initialContent;
>-                snapshot.state = {};
>-
>-                for (let key in initialState.attributes) {
>-                    let value = initialState.attributes[key];
>-
>-                    switch (key) {
>-                    case "setTransform":
>-                        value = [await this.representedObject.swizzle(value, WI.Recording.Swizzle.DOMMatrix)];
>-                        break;
>-
>-                    case "fillStyle":
>-                    case "strokeStyle":
>-                        if (Array.isArray(value)) {
>-                            let canvasStyle = await this.representedObject.swizzle(value[0], WI.Recording.Swizzle.String);
>-                            if (canvasStyle.includes("gradient"))
>-                                value = await this.representedObject.swizzle(value, WI.Recording.Swizzle.CanvasGradient);
>-                            else if (canvasStyle === "pattern")
>-                                value = await this.representedObject.swizzle(value, WI.Recording.Swizzle.CanvasPattern);
>-                        } else
>-                            value = await this.representedObject.swizzle(value, WI.Recording.Swizzle.String);
>-                        break;
>-
>-                    case "direction":
>-                    case "font":
>-                    case "globalCompositeOperation":
>-                    case "imageSmoothingEnabled":
>-                    case "imageSmoothingQuality":
>-                    case "lineCap":
>-                    case "lineJoin":
>-                    case "shadowColor":
>-                    case "textAlign":
>-                    case "textBaseline":
>-                        value = await this.representedObject.swizzle(value, WI.Recording.Swizzle.String);
>-                        break;
>-
>-                    case "setPath":
>-                        value = [await this.representedObject.swizzle(value[0], WI.Recording.Swizzle.Path2D)];
>-                        break;
>-                    }
>-
>-                    if (value === undefined || (Array.isArray(value) && value.includes(undefined)))
>-                        continue;
>-
>-                    snapshot.state[key] = value;
>-                }
>+                snapshot.state = actions[0].state;
>             } else {
>                 snapshot.content = this._snapshots[lastSnapshotIndex].content;
>                 snapshot.state = this._snapshots[lastSnapshotIndex].state;
>                 startIndex = this._snapshots[lastSnapshotIndex].index;
>             }
> 
>-            snapshot.state = applyActions(startIndex, snapshot.index - 1);
>+            applyActions(startIndex, snapshot.index - 1);
>+            if (snapshot.index > 0)
>+                snapshot.state = actions[snapshot.index - 1].state;
> 
>             snapshot.content = new Image;
>             snapshot.content.src = snapshot.element.toDataURL();
>@@ -459,27 +399,20 @@ WI.RecordingContentView = class RecordingContentView extends WI.ContentView
>                 --indexOfLastBeginPathAction;
>         }
> 
>-        this._action = actions[this._index];
>-
>-        let state = applyActions(snapshot.index, this._index);
>-        console.assert(!this._action.state || Object.shallowEqual(this._action.state, state));
>-        if (!this._action.state)
>-            this._action.state = state;
>-
>-        this.dispatchEventToListeners(WI.ContentView.Event.SupplementalRepresentedObjectsDidChange);
>+        applyActions(snapshot.index, this._index);
> 
>         this._previewContainer.appendChild(snapshot.element);
>         this._updateImageGrid();
>     }
> 
>-    async _generateContentCanvasWebGL(index, actions)
>+    _generateContentCanvasWebGL(index)
>     {
>         let imageLoad = (event) => {
>             // Loading took too long and the current action index has already changed.
>             if (index !== this._index)
>                 return;
> 
>-            this._generateContentCanvasWebGL(index, actions);
>+            this._generateContentCanvasWebGL(index);
>         };
> 
>         let initialState = this.representedObject.initialState;
>@@ -490,6 +423,8 @@ WI.RecordingContentView = class RecordingContentView extends WI.ContentView
>             return;
>         }
> 
>+        let actions = this.representedObject.actions;
>+
>         let visualIndex = index;
>         while (!actions[visualIndex].isVisual && !(actions[visualIndex] instanceof WI.RecordingInitialStateAction))
>             visualIndex--;
>@@ -513,18 +448,14 @@ WI.RecordingContentView = class RecordingContentView extends WI.ContentView
> 
>             this._updateImageGrid();
>         }
>-
>-        this.dispatchEventToListeners(WI.ContentView.Event.SupplementalRepresentedObjectsDidChange);
>     }
> 
>     _updateCanvasPath()
>     {
>         let activated = WI.settings.showCanvasPath.value;
>-        if (this._showPathButtonNavigationItem.activated !== activated) {
>-            this.representedObject.actions.then((actions) => {
>-                this._generateContentCanvas2D(this._index, actions);
>-            });
>-        }
>+
>+        if (this._showPathButtonNavigationItem.activated !== activated && !this._processing)
>+            this._generateContentCanvas2D(this._index);
> 
>         this._showPathButtonNavigationItem.activated = activated;
>     }
>@@ -555,6 +486,18 @@ WI.RecordingContentView = class RecordingContentView extends WI.ContentView
>         this._sliderValueElement.textContent = WI.UIString("%d of %d").format(visualActionIndex, visualActionIndexes.length);
>     }
> 
>+    _updateProcessProgress(message, index)
>+    {
>+        if (this._processMessageTextView)
>+            this._processMessageTextView.remove();
>+
>+        this._processMessageTextView = WI.createMessageTextView(message);
>+        this.element.appendChild(this._processMessageTextView);
>+
>+        this._processProgressElement = this._processMessageTextView.appendChild(document.createElement("progress"));
>+        this._processProgressElement.value = index / this.representedObject.actions.length;
>+    }
>+
>     _showPathButtonClicked(event)
>     {
>         WI.settings.showCanvasPath.value = !this._showPathButtonNavigationItem.activated;
>@@ -579,6 +522,16 @@ WI.RecordingContentView = class RecordingContentView extends WI.ContentView
> 
>         this.updateActionIndex(index);
>     }
>+
>+    _handleRecordingProcessedActionSwizzle(event)
>+    {
>+        this._updateProcessProgress(WI.UIString("Loading Recording"), event.data.index);
>+    }
>+
>+    _handleRecordingProcessedActionApply(event)
>+    {
>+        this._updateProcessProgress(WI.UIString("Processing Recording"), event.data.index);
>+    }
> };
> 
> WI.RecordingContentView.SnapshotInterval = 5000;
>diff --git a/LayoutTests/ChangeLog b/LayoutTests/ChangeLog
>index f31bd0d3c44da357fc543fcd404158d29f87f791..09c8ddd31f230e6f3a018da697ed1ea33c4acf3d 100644
>--- a/LayoutTests/ChangeLog
>+++ b/LayoutTests/ChangeLog
>@@ -1,3 +1,12 @@
>+2018-05-01  Devin Rousso  <webkit@devinrousso.com>
>+
>+        Web Inspector: Canvas tab: determine hasVisibleEffect for all actions immediately after recording is added
>+        https://bugs.webkit.org/show_bug.cgi?id=182995
>+
>+        Reviewed by Matt Baker.
>+
>+        * inspector/canvas/resources/recording-utilities.js:
>+
> 2018-04-30  Jiewen Tan  <jiewen_tan@apple.com>
> 
>         Unreviewed test gardening
>diff --git a/LayoutTests/inspector/canvas/resources/recording-utilities.js b/LayoutTests/inspector/canvas/resources/recording-utilities.js
>index 80c48a340e0b53cf33a85e92773f7dd82cce9568..4b35ce1c8e5c66f1053ea9d62e88b81e00cc2b52 100644
>--- a/LayoutTests/inspector/canvas/resources/recording-utilities.js
>+++ b/LayoutTests/inspector/canvas/resources/recording-utilities.js
>@@ -124,7 +124,7 @@ TestPage.registerInitializer(() => {
>             InspectorTest.assert(recording.source.recordingCollection.items.has(recording), "Recording should be in the canvas' list of recordings.");
>             InspectorTest.assert(recording.frames.length === frameCount, `Recording should have ${frameCount} frames.`)
> 
>-            return recording.actions.then(() => {
>+            return Promise.all(recording.actions.map((action) => action.swizzle(recording))).then(() => {
>                 logRecording(recording, type);
>             });
>         }).then(resolve, reject);

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Attachments on bug 182995: 334342 | 334343 | 334420 | 335763 | 339191 | 339193 | 339228