DevTools: extract a component for layer viewer

third_party/WebKit/Source/devtools/front_end/timeline/Layers3DView.js

Index: third_party/WebKit/Source/devtools/front_end/timeline/Layers3DView.js
diff --git a/third_party/WebKit/Source/devtools/front_end/timeline/Layers3DView.js b/third_party/WebKit/Source/devtools/front_end/timeline/Layers3DView.js
deleted file mode 100644
index 9e4468d76ba71e012866c3c16a6b689aa013a244..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/devtools/front_end/timeline/Layers3DView.js
+++ /dev/null
@@ -1,1100 +0,0 @@
-/*
- * Copyright (C) 2014 Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * 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.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "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 THE COPYRIGHT
- * OWNER 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.
- */
-
-/**
- * @constructor
- * @extends {WebInspector.VBox}
- * @param {!WebInspector.LayerViewHost} layerViewHost
- * @implements {WebInspector.LayerView}
- */
-WebInspector.Layers3DView = function(layerViewHost)
-{
-    WebInspector.VBox.call(this);
-    this.element.classList.add("layers-3d-view");
-    this._failBanner = new WebInspector.VBox();
-    this._failBanner.element.classList.add("banner");
-    this._failBanner.element.createTextChild(WebInspector.UIString("Layer information is not yet available."));
-
-    this._layerViewHost = layerViewHost;
-    this._layerViewHost.registerView(this);
-
-    this._transformController = new WebInspector.TransformController(this.element);
-    this._transformController.addEventListener(WebInspector.TransformController.Events.TransformChanged, this._update, this);
-    this._initToolbar();
-
-    this._canvasElement = this.element.createChild("canvas");
-    this._canvasElement.tabIndex = 0;
-    this._canvasElement.addEventListener("dblclick", this._onDoubleClick.bind(this), false);
-    this._canvasElement.addEventListener("mousedown", this._onMouseDown.bind(this), false);
-    this._canvasElement.addEventListener("mouseup", this._onMouseUp.bind(this), false);
-    this._canvasElement.addEventListener("mouseleave", this._onMouseMove.bind(this), false);
-    this._canvasElement.addEventListener("mousemove", this._onMouseMove.bind(this), false);
-    this._canvasElement.addEventListener("contextmenu", this._onContextMenu.bind(this), false);
-
-    this._lastSelection = {};
-    this._layerTree = null;
-    this._textureManager = new WebInspector.LayerTextureManager();
-    this._textureManager.addEventListener(WebInspector.LayerTextureManager.Events.TextureUpdated, this._update, this);
-    /** @type Array.<!WebGLTexture|undefined> */
-    this._chromeTextures = [];
-    this._rects = [];
-
-    this._layerViewHost.showInternalLayersSetting().addChangeListener(this._update, this);
-}
-
-/** @typedef {{borderColor: !Array.<number>, borderWidth: number}} */
-WebInspector.Layers3DView.LayerStyle;
-
-/** @typedef {{layerId: string, rect: !Array.<number>, snapshot: !WebInspector.PaintProfilerSnapshot, traceEvent: !WebInspector.TracingModel.Event}} */
-WebInspector.Layers3DView.PaintTile;
-
-/**
- * @enum {string}
- */
-WebInspector.Layers3DView.OutlineType = {
-    Hovered: "hovered",
-    Selected: "selected"
-}
-
-/**
- * @enum {string}
- */
-/** @enum {symbol} */
-WebInspector.Layers3DView.Events = {
-    LayerSnapshotRequested: Symbol("LayerSnapshotRequested"),
-    PaintProfilerRequested: Symbol("PaintProfilerRequested")
-}
-
-/**
- * @enum {number}
- */
-WebInspector.Layers3DView.ChromeTexture = {
-    Left: 0,
-    Middle: 1,
-    Right: 2
-}
-
-/**
- * @enum {string}
- */
-WebInspector.Layers3DView.ScrollRectTitles = {
-    RepaintsOnScroll: WebInspector.UIString("repaints on scroll"),
-    TouchEventHandler: WebInspector.UIString("touch event listener"),
-    WheelEventHandler: WebInspector.UIString("mousewheel event listener")
-}
-
-WebInspector.Layers3DView.FragmentShader = "" +
-    "precision mediump float;\n" +
-    "varying vec4 vColor;\n" +
-    "varying vec2 vTextureCoord;\n" +
-    "uniform sampler2D uSampler;\n" +
-    "void main(void)\n" +
-    "{\n" +
-    "    gl_FragColor = texture2D(uSampler, vec2(vTextureCoord.s, vTextureCoord.t)) * vColor;\n" +
-    "}";
-
-WebInspector.Layers3DView.VertexShader = "" +
-    "attribute vec3 aVertexPosition;\n" +
-    "attribute vec2 aTextureCoord;\n" +
-    "attribute vec4 aVertexColor;\n" +
-    "uniform mat4 uPMatrix;\n" +
-    "varying vec2 vTextureCoord;\n" +
-    "varying vec4 vColor;\n" +
-    "void main(void)\n" +
-    "{\n" +
-        "gl_Position = uPMatrix * vec4(aVertexPosition, 1.0);\n" +
-        "vColor = aVertexColor;\n" +
-        "vTextureCoord = aTextureCoord;\n" +
-    "}";
-
-WebInspector.Layers3DView.HoveredBorderColor = [0, 0, 255, 1];
-WebInspector.Layers3DView.SelectedBorderColor = [0, 255, 0, 1];
-WebInspector.Layers3DView.BorderColor = [0, 0, 0, 1];
-WebInspector.Layers3DView.ViewportBorderColor = [160, 160, 160, 1];
-WebInspector.Layers3DView.ScrollRectBackgroundColor = [178, 100, 100, 0.6];
-WebInspector.Layers3DView.HoveredImageMaskColor = [200, 200, 255, 1];
-WebInspector.Layers3DView.BorderWidth = 1;
-WebInspector.Layers3DView.SelectedBorderWidth = 2;
-WebInspector.Layers3DView.ViewportBorderWidth = 3;
-
-WebInspector.Layers3DView.LayerSpacing = 20;
-WebInspector.Layers3DView.ScrollRectSpacing = 4;
-
-WebInspector.Layers3DView.prototype = {
-    /**
-     * @param {?WebInspector.LayerTreeBase} layerTree
-     * @override
-     */
-    setLayerTree: function(layerTree)
-    {
-        this._layerTree = layerTree;
-        this._textureManager.reset();
-        this._update();
-    },
-
-    /**
-     * @param {?Array.<!WebInspector.Layers3DView.PaintTile>} tiles
-     */
-    setTiles: function(tiles)
-    {
-        this._textureManager.setTiles(tiles);
-    },
-
-    /**
-     * @param {!WebInspector.Layer} layer
-     * @param {string=} imageURL
-     */
-    showImageForLayer: function(layer, imageURL)
-    {
-        if (imageURL)
-            this._textureManager.createTexture(onTextureCreated.bind(this), imageURL);
-        else
-            onTextureCreated.call(this, null);
-
-        /**
-         * @this {WebInspector.Layers3DView}
-         * @param {?WebGLTexture} texture
-         */
-        function onTextureCreated(texture)
-        {
-            this._layerTexture = texture ? {layerId: layer.id(), texture: texture} : null;
-            this._update();
-        }
-    },
-
-    onResize: function()
-    {
-        this._resizeCanvas();
-        this._update();
-    },
-
-    wasShown: function()
-    {
-        if (!this._needsUpdate)
-            return;
-        this._resizeCanvas();
-        this._update();
-    },
-
-    /**
-     * @param {!WebInspector.Layers3DView.OutlineType} type
-     * @param {?WebInspector.LayerView.Selection} selection
-     */
-    _setOutline: function(type, selection)
-    {
-        this._lastSelection[type] = selection;
-        this._update();
-    },
-
-    /**
-     * @param {?WebInspector.LayerView.Selection} selection
-     * @override
-     */
-    hoverObject: function(selection)
-    {
-        this._setOutline(WebInspector.Layers3DView.OutlineType.Hovered, selection);
-    },
-
-    /**
-     * @param {?WebInspector.LayerView.Selection} selection
-     * @override
-     */
-    selectObject: function(selection)
-    {
-        this._setOutline(WebInspector.Layers3DView.OutlineType.Hovered, null);
-        this._setOutline(WebInspector.Layers3DView.OutlineType.Selected, selection);
-    },
-
-    /**
-     * @param {!Element} canvas
-     * @return {?WebGLRenderingContext}
-     */
-    _initGL: function(canvas)
-    {
-        var gl = canvas.getContext("webgl");
-        if (!gl)
-            return null;
-        gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
-        gl.enable(gl.BLEND);
-        gl.clearColor(0.0, 0.0, 0.0, 0.0);
-        gl.enable(gl.DEPTH_TEST);
-        return gl;
-    },
-
-    /**
-     * @param {!Object} type
-     * @param {string} script
-     */
-    _createShader: function(type, script)
-    {
-        var shader = this._gl.createShader(type);
-        this._gl.shaderSource(shader, script);
-        this._gl.compileShader(shader);
-        this._gl.attachShader(this._shaderProgram, shader);
-    },
-
-    _initShaders: function()
-    {
-        this._shaderProgram = this._gl.createProgram();
-        this._createShader(this._gl.FRAGMENT_SHADER, WebInspector.Layers3DView.FragmentShader);
-        this._createShader(this._gl.VERTEX_SHADER, WebInspector.Layers3DView.VertexShader);
-        this._gl.linkProgram(this._shaderProgram);
-        this._gl.useProgram(this._shaderProgram);
-
-        this._shaderProgram.vertexPositionAttribute = this._gl.getAttribLocation(this._shaderProgram, "aVertexPosition");
-        this._gl.enableVertexAttribArray(this._shaderProgram.vertexPositionAttribute);
-        this._shaderProgram.vertexColorAttribute = this._gl.getAttribLocation(this._shaderProgram, "aVertexColor");
-        this._gl.enableVertexAttribArray(this._shaderProgram.vertexColorAttribute);
-        this._shaderProgram.textureCoordAttribute = this._gl.getAttribLocation(this._shaderProgram, "aTextureCoord");
-        this._gl.enableVertexAttribArray(this._shaderProgram.textureCoordAttribute);
-
-        this._shaderProgram.pMatrixUniform = this._gl.getUniformLocation(this._shaderProgram, "uPMatrix");
-        this._shaderProgram.samplerUniform = this._gl.getUniformLocation(this._shaderProgram, "uSampler");
-    },
-
-    _resizeCanvas: function()
-    {
-        this._canvasElement.width = this._canvasElement.offsetWidth * window.devicePixelRatio;
-        this._canvasElement.height = this._canvasElement.offsetHeight * window.devicePixelRatio;
-    },
-
-    _updateTransformAndConstraints: function()
-    {
-        var paddingFraction = 0.1;
-        var viewport = this._layerTree.viewportSize();
-        var root = this._layerTree.root();
-        var baseWidth = viewport ? viewport.width : this._dimensionsForAutoscale.width;
-        var baseHeight = viewport ? viewport.height : this._dimensionsForAutoscale.height;
-        var canvasWidth = this._canvasElement.width;
-        var canvasHeight = this._canvasElement.height;
-        var paddingX = canvasWidth * paddingFraction;
-        var paddingY = canvasHeight * paddingFraction;
-        var scaleX = (canvasWidth - 2 * paddingX) / baseWidth;
-        var scaleY = (canvasHeight - 2 * paddingY) / baseHeight;
-        var viewScale = Math.min(scaleX, scaleY);
-        var minScaleConstraint = Math.min(baseWidth / this._dimensionsForAutoscale.width, baseHeight / this._dimensionsForAutoscale.width) / 2;
-        this._transformController.setScaleConstraints(minScaleConstraint, 10 / viewScale); // 1/viewScale is 1:1 in terms of pixels, so allow zooming to 10x of native size
-        var scale = this._transformController.scale();
-        var rotateX = this._transformController.rotateX();
-        var rotateY = this._transformController.rotateY();
-        this._scale = scale * viewScale;
-        var scaleAndRotationMatrix = new WebKitCSSMatrix().scale(scale, scale, scale).translate(canvasWidth / 2, canvasHeight / 2, 0)
-            .rotate(rotateX, rotateY, 0).scale(viewScale, viewScale, viewScale).translate(-baseWidth / 2, -baseHeight / 2, 0);
-
-        var bounds;
-        for (var i = 0; i < this._rects.length; ++i)
-            bounds = WebInspector.Geometry.boundsForTransformedPoints(scaleAndRotationMatrix, this._rects[i].vertices, bounds);
-
-        this._transformController.clampOffsets((paddingX - bounds.maxX) / window.devicePixelRatio, (canvasWidth - paddingX - bounds.minX) / window.devicePixelRatio,
-                                               (paddingY - bounds.maxY) / window.devicePixelRatio, (canvasHeight - paddingY - bounds.minY) / window.devicePixelRatio);
-        var offsetX = this._transformController.offsetX() * window.devicePixelRatio;
-        var offsetY = this._transformController.offsetY() * window.devicePixelRatio;
-        // Multiply to translation matrix on the right rather than translate (which would implicitly multiply on the left).
-        this._projectionMatrix = new WebKitCSSMatrix().translate(offsetX, offsetY, 0).multiply(scaleAndRotationMatrix);
-
-        var glProjectionMatrix = new WebKitCSSMatrix().scale(1, -1, -1).translate(-1, -1, 0)
-            .scale(2 / this._canvasElement.width, 2 / this._canvasElement.height, 1 / 1000000).multiply(this._projectionMatrix);
-        this._gl.uniformMatrix4fv(this._shaderProgram.pMatrixUniform, false, this._arrayFromMatrix(glProjectionMatrix));
-    },
-
-    /**
-     * @param {!CSSMatrix} m
-     * @return {!Float32Array}
-     */
-    _arrayFromMatrix: function(m)
-    {
-        return new Float32Array([m.m11, m.m12, m.m13, m.m14, m.m21, m.m22, m.m23, m.m24, m.m31, m.m32, m.m33, m.m34, m.m41, m.m42, m.m43, m.m44]);
-    },
-
-    _initWhiteTexture: function()
-    {
-        this._whiteTexture = this._gl.createTexture();
-        this._gl.bindTexture(this._gl.TEXTURE_2D, this._whiteTexture);
-        var whitePixel = new Uint8Array([255, 255, 255, 255]);
-        this._gl.texImage2D(this._gl.TEXTURE_2D, 0, this._gl.RGBA, 1, 1, 0, this._gl.RGBA, this._gl.UNSIGNED_BYTE, whitePixel);
-    },
-
-    _initChromeTextures: function()
-    {
-        /**
-         * @this {WebInspector.Layers3DView}
-         * @param {!WebInspector.Layers3DView.ChromeTexture} index
-         * @param {?WebGLTexture} value
-         */
-        function saveChromeTexture(index, value)
-        {
-            this._chromeTextures[index] = value || undefined;
-        }
-        this._textureManager.createTexture(saveChromeTexture.bind(this, WebInspector.Layers3DView.ChromeTexture.Left), "Images/chromeLeft.png");
-        this._textureManager.createTexture(saveChromeTexture.bind(this, WebInspector.Layers3DView.ChromeTexture.Middle), "Images/chromeMiddle.png");
-        this._textureManager.createTexture(saveChromeTexture.bind(this, WebInspector.Layers3DView.ChromeTexture.Right), "Images/chromeRight.png");
-    },
-
-    /**
-     * @return {?WebGLRenderingContext}
-     */
-    _initGLIfNecessary: function()
-    {
-        if (this._gl)
-            return this._gl;
-        this._gl = this._initGL(this._canvasElement);
-        if (!this._gl)
-            return null;
-        this._initShaders();
-        this._initWhiteTexture();
-        this._initChromeTextures();
-        this._textureManager.setContext(this._gl);
-        return this._gl;
-    },
-
-    _calculateDepthsAndVisibility: function()
-    {
-        this._depthByLayerId = {};
-        var depth = 0;
-        var showInternalLayers = this._layerViewHost.showInternalLayersSetting().get();
-        var root = showInternalLayers ? this._layerTree.root() : (this._layerTree.contentRoot() || this._layerTree.root());
-        var queue = [root];
-        this._depthByLayerId[root.id()] = 0;
-        this._visibleLayers = {};
-        while (queue.length > 0) {
-            var layer = queue.shift();
-            this._visibleLayers[layer.id()] = showInternalLayers || layer.drawsContent();
-            var children = layer.children();
-            for (var i = 0; i < children.length; ++i) {
-                this._depthByLayerId[children[i].id()] = ++depth;
-                queue.push(children[i]);
-            }
-        }
-        this._maxDepth = depth;
-    },
-
-    /**
-     * @param {!WebInspector.Layer} layer
-     * @return {number}
-     */
-    _depthForLayer: function(layer)
-    {
-        return this._depthByLayerId[layer.id()] * WebInspector.Layers3DView.LayerSpacing;
-    },
-
-    /**
-     * @param {!WebInspector.Layer} layer
-     * @param {number} index
-     * @return {number}
-     */
-    _calculateScrollRectDepth: function(layer, index)
-    {
-        return this._depthForLayer(layer) + index * WebInspector.Layers3DView.ScrollRectSpacing + 1;
-    },
-
-    /**
-     * @param {!WebInspector.Layer} layer
-     */
-    _updateDimensionsForAutoscale: function(layer)
-    {
-        // We don't want to be precise, but rather pick something least affected by
-        // animationtransforms, so that we don't change scale too often. So let's
-        // disregard transforms, scrolling and relative layer positioning and choose
-        // the largest dimensions of all layers.
-        this._dimensionsForAutoscale.width = Math.max(layer.width(), this._dimensionsForAutoscale.width);
-        this._dimensionsForAutoscale.height = Math.max(layer.height(), this._dimensionsForAutoscale.height);
-    },
-
-    /**
-     * @param {!WebInspector.Layer} layer
-     */
-    _calculateLayerRect: function(layer)
-    {
-        if (!this._visibleLayers[layer.id()])
-            return;
-        var selection = new WebInspector.LayerView.LayerSelection(layer);
-        var rect = new WebInspector.Layers3DView.Rectangle(selection);
-        rect.setVertices(layer.quad(), this._depthForLayer(layer));
-        this._appendRect(rect);
-        this._updateDimensionsForAutoscale(layer);
-    },
-
-    /**
-     * @param {!WebInspector.Layers3DView.Rectangle} rect
-     */
-    _appendRect: function(rect)
-    {
-        var selection = rect.relatedObject;
-        var isSelected = WebInspector.LayerView.Selection.isEqual(this._lastSelection[WebInspector.Layers3DView.OutlineType.Selected], selection);
-        var isHovered = WebInspector.LayerView.Selection.isEqual(this._lastSelection[WebInspector.Layers3DView.OutlineType.Hovered], selection);
-        if (isSelected) {
-            rect.borderColor = WebInspector.Layers3DView.SelectedBorderColor;
-        } else if (isHovered) {
-            rect.borderColor = WebInspector.Layers3DView.HoveredBorderColor;
-            var fillColor = rect.fillColor || [255, 255, 255, 1];
-            var maskColor = WebInspector.Layers3DView.HoveredImageMaskColor;
-            rect.fillColor = [fillColor[0] * maskColor[0] / 255, fillColor[1] * maskColor[1] / 255, fillColor[2] * maskColor[2] / 255, fillColor[3] * maskColor[3]];
-        } else {
-            rect.borderColor = WebInspector.Layers3DView.BorderColor;
-        }
-        rect.lineWidth = isSelected ? WebInspector.Layers3DView.SelectedBorderWidth : WebInspector.Layers3DView.BorderWidth;
-        this._rects.push(rect);
-    },
-
-    /**
-     * @param {!WebInspector.Layer} layer
-     */
-    _calculateLayerScrollRects: function(layer)
-    {
-        var scrollRects = layer.scrollRects();
-        for (var i = 0; i < scrollRects.length; ++i) {
-            var selection = new WebInspector.LayerView.ScrollRectSelection(layer, i);
-            var rect = new WebInspector.Layers3DView.Rectangle(selection);
-            rect.calculateVerticesFromRect(layer, scrollRects[i].rect, this._calculateScrollRectDepth(layer, i));
-            rect.fillColor = WebInspector.Layers3DView.ScrollRectBackgroundColor;
-            this._appendRect(rect);
-        }
-    },
-
-    /**
-     * @param {!WebInspector.Layer} layer
-     */
-    _calculateLayerImageRect: function(layer)
-    {
-        var layerTexture = this._layerTexture;
-        if (layer.id() !== layerTexture.layerId)
-            return;
-        var selection = new WebInspector.LayerView.LayerSelection(layer);
-        var rect = new WebInspector.Layers3DView.Rectangle(selection);
-        rect.setVertices(layer.quad(), this._depthForLayer(layer));
-        rect.texture = layerTexture.texture;
-        this._appendRect(rect);
-    },
-
-    /**
-     * @param {!WebInspector.Layer} layer
-     */
-    _calculateLayerTileRects: function(layer)
-    {
-        var tiles = this._textureManager.tilesForLayer(layer.id());
-        for (var i = 0; i < tiles.length; ++i) {
-            var tile = tiles[i];
-            if (!tile.texture)
-                continue;
-            var selection = new WebInspector.LayerView.TileSelection(layer, tile.traceEvent);
-            var rect = new WebInspector.Layers3DView.Rectangle(selection);
-            rect.calculateVerticesFromRect(layer, {x: tile.rect[0], y: tile.rect[1], width: tile.rect[2], height: tile.rect[3]}, this._depthForLayer(layer) + 1);
-            rect.texture = tile.texture;
-            this._appendRect(rect);
-        }
-    },
-
-    _calculateRects: function()
-    {
-        this._rects = [];
-        this._dimensionsForAutoscale = { width: 0, height: 0 };
-        this._layerTree.forEachLayer(this._calculateLayerRect.bind(this));
-
-        if (this._showSlowScrollRectsSetting.get())
-            this._layerTree.forEachLayer(this._calculateLayerScrollRects.bind(this));
-
-        if (this._showPaintsSetting.get()) {
-            if (this._layerTexture)
-                this._layerTree.forEachLayer(this._calculateLayerImageRect.bind(this));
-            else
-                this._layerTree.forEachLayer(this._calculateLayerTileRects.bind(this));
-        }
-    },
-
-    /**
-     * @param {!Array.<number>} color
-     * @return {!Array.<number>}
-     */
-    _makeColorsArray: function(color)
-    {
-        var colors = [];
-        var normalizedColor = [color[0] / 255, color[1] / 255, color[2] / 255, color[3]];
-        for (var i = 0; i < 4; i++)
-            colors = colors.concat(normalizedColor);
-        return colors;
-    },
-
-    /**
-     * @param {!Object} attribute
-     * @param {!Array.<number>} array
-     * @param {number} length
-     */
-    _setVertexAttribute: function(attribute, array, length)
-    {
-        var gl = this._gl;
-        var buffer = gl.createBuffer();
-        gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
-        gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(array), gl.STATIC_DRAW);
-        gl.vertexAttribPointer(attribute, length, gl.FLOAT, false, 0, 0);
-    },
-
-    /**
-     * @param {!Array.<number>} vertices
-     * @param {number} mode
-     * @param {!Array.<number>=} color
-     * @param {!Object=} texture
-     */
-    _drawRectangle: function(vertices, mode, color, texture)
-    {
-        var gl = this._gl;
-        var white = [255, 255, 255, 1];
-        color = color || white;
-        this._setVertexAttribute(this._shaderProgram.vertexPositionAttribute, vertices, 3);
-        this._setVertexAttribute(this._shaderProgram.textureCoordAttribute, [0, 1, 1, 1, 1, 0, 0, 0], 2);
-        this._setVertexAttribute(this._shaderProgram.vertexColorAttribute, this._makeColorsArray(color), color.length);
-
-        if (texture) {
-            gl.activeTexture(gl.TEXTURE0);
-            gl.bindTexture(gl.TEXTURE_2D, texture);
-            gl.uniform1i(this._shaderProgram.samplerUniform, 0);
-        } else {
-            gl.bindTexture(gl.TEXTURE_2D, this._whiteTexture);
-        }
-
-        var numberOfVertices = vertices.length / 3;
-        gl.drawArrays(mode, 0, numberOfVertices);
-    },
-
-    /**
-     * @param {!Array.<number>} vertices
-     * @param {!WebGLTexture} texture
-     * @param {!Array.<number>=} color
-     */
-    _drawTexture: function(vertices, texture, color)
-    {
-        this._drawRectangle(vertices, this._gl.TRIANGLE_FAN, color, texture);
-    },
-
-    _drawViewportAndChrome: function()
-    {
-        var viewport = this._layerTree.viewportSize();
-        if (!viewport)
-            return;
-
-        var drawChrome = !WebInspector.moduleSetting("frameViewerHideChromeWindow").get() && this._chromeTextures.length >= 3 && this._chromeTextures.indexOf(undefined) < 0;
-        var z = (this._maxDepth + 1) * WebInspector.Layers3DView.LayerSpacing;
-        var borderWidth = Math.ceil(WebInspector.Layers3DView.ViewportBorderWidth * this._scale);
-        var vertices = [viewport.width, 0, z, viewport.width, viewport.height, z, 0, viewport.height, z, 0, 0, z];
-        this._gl.lineWidth(borderWidth);
-        this._drawRectangle(vertices, drawChrome ? this._gl.LINE_STRIP : this._gl.LINE_LOOP, WebInspector.Layers3DView.ViewportBorderColor);
-
-        if (!drawChrome)
-            return;
-
-        var borderAdjustment = WebInspector.Layers3DView.ViewportBorderWidth / 2;
-        var viewportWidth = this._layerTree.viewportSize().width + 2 * borderAdjustment;
-        var chromeHeight = this._chromeTextures[0].image.naturalHeight;
-        var middleFragmentWidth = viewportWidth - this._chromeTextures[0].image.naturalWidth - this._chromeTextures[2].image.naturalWidth;
-        var x = -borderAdjustment;
-        var y = -chromeHeight;
-        for (var i = 0; i < this._chromeTextures.length; ++i) {
-            var width = i === WebInspector.Layers3DView.ChromeTexture.Middle ? middleFragmentWidth : this._chromeTextures[i].image.naturalWidth;
-            if (width < 0 || x + width > viewportWidth)
-                break;
-            vertices = [x, y, z, x + width, y, z, x + width, y + chromeHeight, z, x, y + chromeHeight, z];
-            this._drawTexture(vertices, /** @type {!WebGLTexture} */ (this._chromeTextures[i]));
-            x += width;
-        }
-    },
-
-    /**
-     * @param {!WebInspector.Layers3DView.Rectangle} rect
-     */
-    _drawViewRect: function(rect)
-    {
-        var vertices = rect.vertices;
-        if (rect.texture)
-            this._drawTexture(vertices, rect.texture, rect.fillColor || undefined);
-        else if (rect.fillColor)
-            this._drawRectangle(vertices, this._gl.TRIANGLE_FAN, rect.fillColor);
-        this._gl.lineWidth(rect.lineWidth);
-        if (rect.borderColor)
-            this._drawRectangle(vertices, this._gl.LINE_LOOP, rect.borderColor);
-    },
-
-    _update: function()
-    {
-        if (!this.isShowing()) {
-            this._needsUpdate = true;
-            return;
-        }
-        if (!this._layerTree || !this._layerTree.root()) {
-            this._failBanner.show(this.element);
-            return;
-        }
-        var gl = this._initGLIfNecessary();
-        if (!gl) {
-            this._failBanner.element.removeChildren();
-            this._failBanner.element.appendChild(this._webglDisabledBanner());
-            this._failBanner.show(this.element);
-            return;
-        }
-        this._failBanner.detach();
-        this._gl.viewportWidth = this._canvasElement.width;
-        this._gl.viewportHeight = this._canvasElement.height;
-
-        this._calculateDepthsAndVisibility();
-        this._calculateRects();
-        this._updateTransformAndConstraints();
-
-        this._textureManager.setScale(Number.constrain(0.1, 1, this._scale));
-        gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);
-        gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
-
-        this._rects.forEach(this._drawViewRect.bind(this));
-        this._drawViewportAndChrome();
-    },
-
-    /**
-     * @return {!Node}
-     */
-    _webglDisabledBanner: function()
-    {
-        var fragment = this.element.ownerDocument.createDocumentFragment();
-        fragment.createChild("div").textContent = WebInspector.UIString("Can't display layers,");
-        fragment.createChild("div").textContent = WebInspector.UIString("WebGL support is disabled in your browser.");
-        fragment.appendChild(WebInspector.formatLocalized("Check %s for possible reasons.", [WebInspector.linkifyURLAsNode("about:gpu", undefined, undefined, true)]));
-        return fragment;
-    },
-
-    /**
-     * @param {!Event} event
-     * @return {?WebInspector.LayerView.Selection}
-     */
-    _selectionFromEventPoint: function(event)
-    {
-        if (!this._layerTree)
-            return null;
-        var closestIntersectionPoint = Infinity;
-        var closestObject = null;
-        var projectionMatrix = new WebKitCSSMatrix().scale(1, -1, -1).translate(-1, -1, 0).multiply(this._projectionMatrix);
-        var x0 = (event.clientX - this._canvasElement.totalOffsetLeft()) * window.devicePixelRatio;
-        var y0 = -(event.clientY - this._canvasElement.totalOffsetTop()) * window.devicePixelRatio;
-
-        /**
-         * @param {!WebInspector.Layers3DView.Rectangle} rect
-         */
-        function checkIntersection(rect)
-        {
-            if (!rect.relatedObject)
-                return;
-            var t = rect.intersectWithLine(projectionMatrix, x0, y0);
-            if (t < closestIntersectionPoint) {
-                closestIntersectionPoint = t;
-                closestObject = rect.relatedObject;
-            }
-        }
-
-        this._rects.forEach(checkIntersection);
-        return closestObject;
-    },
-
-    /**
-     * @param {string} caption
-     * @param {string} name
-     * @param {boolean} value
-     * @param {!WebInspector.Toolbar} toolbar
-     * @return {!WebInspector.Setting}
-     */
-    _createVisibilitySetting: function(caption, name, value, toolbar)
-    {
-        var checkbox = new WebInspector.ToolbarCheckbox(WebInspector.UIString(caption));
-        toolbar.appendToolbarItem(checkbox);
-        var setting = WebInspector.settings.createSetting(name, value);
-        WebInspector.SettingsUI.bindCheckbox(checkbox.inputElement, setting);
-        setting.addChangeListener(this._update, this);
-        return setting;
-    },
-
-    _initToolbar: function()
-    {
-        this._panelToolbar = this._transformController.toolbar();
-        this.element.appendChild(this._panelToolbar.element);
-        this._showSlowScrollRectsSetting = this._createVisibilitySetting("Slow scroll rects", "frameViewerShowSlowScrollRects", true, this._panelToolbar);
-        this._showPaintsSetting = this._createVisibilitySetting("Paints", "frameViewerShowPaints", true, this._panelToolbar);
-        WebInspector.moduleSetting("frameViewerHideChromeWindow").addChangeListener(this._update, this);
-    },
-
-    /**
-     * @param {!Event} event
-     */
-    _onContextMenu: function(event)
-    {
-        var contextMenu = new WebInspector.ContextMenu(event);
-        contextMenu.appendItem(WebInspector.UIString("Reset View"), this._transformController.resetAndNotify.bind(this._transformController), false);
-        var selection = this._selectionFromEventPoint(event);
-        if (selection && selection.type() === WebInspector.LayerView.Selection.Type.Tile)
-            contextMenu.appendItem(WebInspector.UIString("Show Paint Profiler"), this.dispatchEventToListeners.bind(this, WebInspector.Layers3DView.Events.PaintProfilerRequested, selection.traceEvent()), false);
-        this._layerViewHost.showContextMenu(contextMenu, selection);
-    },
-
-    /**
-     * @param {!Event} event
-     */
-    _onMouseMove: function(event)
-    {
-        if (event.which)
-            return;
-        this._layerViewHost.hoverObject(this._selectionFromEventPoint(event));
-    },
-
-    /**
-     * @param {!Event} event
-     */
-    _onMouseDown: function(event)
-    {
-        this._mouseDownX = event.clientX;
-        this._mouseDownY = event.clientY;
-    },
-
-    /**
-     * @param {!Event} event
-     */
-    _onMouseUp: function(event)
-    {
-        const maxDistanceInPixels = 6;
-        if (this._mouseDownX && Math.abs(event.clientX - this._mouseDownX) < maxDistanceInPixels && Math.abs(event.clientY - this._mouseDownY) < maxDistanceInPixels)
-            this._layerViewHost.selectObject(this._selectionFromEventPoint(event));
-        delete this._mouseDownX;
-        delete this._mouseDownY;
-    },
-
-    /**
-     * @param {!Event} event
-     */
-    _onDoubleClick: function(event)
-    {
-        var selection = this._selectionFromEventPoint(event);
-        if (selection) {
-            if (selection.type() === WebInspector.LayerView.Selection.Type.Tile)
-                this.dispatchEventToListeners(WebInspector.Layers3DView.Events.PaintProfilerRequested, selection.traceEvent());
-            else if (selection.layer())
-                this.dispatchEventToListeners(WebInspector.Layers3DView.Events.LayerSnapshotRequested, selection.layer());
-        }
-        event.stopPropagation();
-    },
-
-    __proto__: WebInspector.VBox.prototype
-}
-
-/**
- * @constructor
- * @extends {WebInspector.Object}
- */
-WebInspector.LayerTextureManager = function()
-{
-    WebInspector.Object.call(this);
-    this.reset();
-}
-
-/** @enum {symbol} */
-WebInspector.LayerTextureManager.Events = {
-    TextureUpdated: Symbol("TextureUpated")
-}
-
-WebInspector.LayerTextureManager.prototype = {
-    reset: function()
-    {
-        /** @type {!Object.<string, !Array.<!WebInspector.LayerTextureManager.Tile>>} */
-        this._tilesByLayerId = {};
-        this._scale = 0;
-    },
-
-    /**
-     * @param {!WebGLRenderingContext} glContext
-     */
-    setContext: function(glContext)
-    {
-        this._gl = glContext;
-        if (this._scale)
-            this._updateTextures();
-    },
-
-    /**
-     * @param {?Array.<!WebInspector.Layers3DView.PaintTile>} paintTiles
-     */
-    setTiles: function(paintTiles)
-    {
-        this._tilesByLayerId = {};
-        if (!paintTiles)
-            return;
-        for (var i = 0; i < paintTiles.length; ++i) {
-            var layerId = paintTiles[i].layerId;
-            var tilesForLayer = this._tilesByLayerId[layerId];
-            if (!tilesForLayer) {
-                tilesForLayer = [];
-                this._tilesByLayerId[layerId] = tilesForLayer;
-            }
-            var tile = new WebInspector.LayerTextureManager.Tile(paintTiles[i].snapshot, paintTiles[i].rect, paintTiles[i].traceEvent);
-            tilesForLayer.push(tile);
-            if (this._scale && this._gl)
-                this._updateTile(tile);
-        }
-    },
-
-    /**
-     * @param {number} scale
-     */
-    setScale: function(scale)
-    {
-        if (this._scale && this._scale >= scale)
-            return;
-        this._scale = scale;
-        this._updateTextures();
-    },
-
-    /**
-     * @param {string} layerId
-     * @return {!Array.<!WebInspector.LayerTextureManager.Tile>}
-     */
-    tilesForLayer: function(layerId)
-    {
-        return this._tilesByLayerId[layerId] || [];
-    },
-
-    _updateTextures: function()
-    {
-        if (!this._gl)
-            return;
-        if (!this._scale)
-            return;
-
-        for (var layerId in this._tilesByLayerId) {
-            for (var i = 0; i < this._tilesByLayerId[layerId].length; ++i) {
-                var tile = this._tilesByLayerId[layerId][i];
-                if (!tile.scale || tile.scale < this._scale)
-                    this._updateTile(tile);
-            }
-        }
-    },
-
-    /**
-     * @param {!WebInspector.LayerTextureManager.Tile} tile
-     */
-    _updateTile: function(tile)
-    {
-        console.assert(this._scale && this._gl);
-        tile.scale = this._scale;
-        tile.snapshot.requestImage(null, null, tile.scale, onGotImage.bind(this));
-
-        /**
-         * @this {WebInspector.LayerTextureManager}
-         * @param {string=} imageURL
-         */
-        function onGotImage(imageURL)
-        {
-            if (imageURL)
-                this.createTexture(onTextureCreated.bind(this), imageURL);
-        }
-
-        /**
-         * @this {WebInspector.LayerTextureManager}
-         * @param {?WebGLTexture} texture
-         */
-        function onTextureCreated(texture)
-        {
-            tile.texture = texture;
-            this.dispatchEventToListeners(WebInspector.LayerTextureManager.Events.TextureUpdated);
-        }
-    },
-
-    /**
-     * @param {function(?WebGLTexture)} textureCreatedCallback
-     * @param {string} imageURL
-     */
-    createTexture: function(textureCreatedCallback, imageURL)
-    {
-        var image = new Image();
-        image.addEventListener("load", onImageLoaded.bind(this), false);
-        image.addEventListener("error", onImageError, false);
-        image.src = imageURL;
-
-        /**
-         * @this {WebInspector.LayerTextureManager}
-         */
-        function onImageLoaded()
-        {
-            textureCreatedCallback(this._createTextureForImage(image));
-        }
-
-        function onImageError()
-        {
-            textureCreatedCallback(null);
-        }
-    },
-
-    /**
-     * @param {!Image} image
-     * @return {!WebGLTexture} texture
-     */
-    _createTextureForImage: function(image)
-    {
-        var texture = this._gl.createTexture();
-        texture.image = image;
-        this._gl.bindTexture(this._gl.TEXTURE_2D, texture);
-        this._gl.pixelStorei(this._gl.UNPACK_FLIP_Y_WEBGL, true);
-        this._gl.texImage2D(this._gl.TEXTURE_2D, 0, this._gl.RGBA, this._gl.RGBA, this._gl.UNSIGNED_BYTE, texture.image);
-        this._gl.texParameteri(this._gl.TEXTURE_2D, this._gl.TEXTURE_MIN_FILTER, this._gl.LINEAR);
-        this._gl.texParameteri(this._gl.TEXTURE_2D, this._gl.TEXTURE_MAG_FILTER, this._gl.LINEAR);
-        this._gl.texParameteri(this._gl.TEXTURE_2D, this._gl.TEXTURE_WRAP_S, this._gl.CLAMP_TO_EDGE);
-        this._gl.texParameteri(this._gl.TEXTURE_2D, this._gl.TEXTURE_WRAP_T, this._gl.CLAMP_TO_EDGE);
-        this._gl.bindTexture(this._gl.TEXTURE_2D, null);
-        return texture;
-    },
-
-    __proto__: WebInspector.Object.prototype
-}
-
-/**
- * @constructor
- * @param {?WebInspector.LayerView.Selection} relatedObject
- */
-WebInspector.Layers3DView.Rectangle = function(relatedObject)
-{
-    this.relatedObject = relatedObject;
-    /** @type {number} */
-    this.lineWidth = 1;
-    /** @type {?Array.<number>} */
-    this.borderColor = null;
-    /** @type {?Array.<number>} */
-    this.fillColor = null;
-    /** @type {?WebGLTexture} */
-    this.texture = null;
-}
-
-WebInspector.Layers3DView.Rectangle.prototype = {
-    /**
-     * @param {!Array.<number>} quad
-     * @param {number} z
-     */
-    setVertices: function(quad, z)
-    {
-        this.vertices = [quad[0], quad[1], z, quad[2], quad[3], z, quad[4], quad[5], z, quad[6], quad[7], z];
-    },
-
-    /**
-     * Finds coordinates of point on layer quad, having offsets (ratioX * width) and (ratioY * height)
-     * from the left corner of the initial layer rect, where width and heigth are layer bounds.
-     * @param {!Array.<number>} quad
-     * @param {number} ratioX
-     * @param {number} ratioY
-     * @return {!Array.<number>}
-     */
-    _calculatePointOnQuad: function(quad, ratioX, ratioY)
-    {
-        var x0 = quad[0];
-        var y0 = quad[1];
-        var x1 = quad[2];
-        var y1 = quad[3];
-        var x2 = quad[4];
-        var y2 = quad[5];
-        var x3 = quad[6];
-        var y3 = quad[7];
-        // Point on the first quad side clockwise
-        var firstSidePointX = x0 + ratioX * (x1 - x0);
-        var firstSidePointY = y0 + ratioX * (y1 - y0);
-        // Point on the third quad side clockwise
-        var thirdSidePointX = x3 + ratioX * (x2 - x3);
-        var thirdSidePointY = y3 + ratioX * (y2 - y3);
-        var x = firstSidePointX + ratioY * (thirdSidePointX - firstSidePointX);
-        var y = firstSidePointY + ratioY * (thirdSidePointY - firstSidePointY);
-        return [x, y];
-    },
-
-    /**
-     * @param {!WebInspector.Layer} layer
-     * @param {!DOMAgent.Rect} rect
-     * @param {number} z
-     */
-    calculateVerticesFromRect: function(layer, rect, z)
-    {
-        var quad = layer.quad();
-        var rx1 = rect.x / layer.width();
-        var rx2 = (rect.x + rect.width) / layer.width();
-        var ry1 = rect.y / layer.height();
-        var ry2 = (rect.y + rect.height) / layer.height();
-        var rectQuad = this._calculatePointOnQuad(quad, rx1, ry1).concat(this._calculatePointOnQuad(quad, rx2, ry1))
-            .concat(this._calculatePointOnQuad(quad, rx2, ry2)).concat(this._calculatePointOnQuad(quad, rx1, ry2));
-        this.setVertices(rectQuad, z);
-    },
-
-    /**
-     * Intersects quad with given transform matrix and line l(t) = (x0, y0, t)
-     * @param {!CSSMatrix} matrix
-     * @param {number} x0
-     * @param {number} y0
-     * @return {(number|undefined)}
-     */
-    intersectWithLine: function(matrix, x0, y0)
-    {
-        var i;
-        // Vertices of the quad with transform matrix applied
-        var points = [];
-        for (i = 0; i < 4; ++i)
-            points[i] = WebInspector.Geometry.multiplyVectorByMatrixAndNormalize(new WebInspector.Geometry.Vector(this.vertices[i * 3], this.vertices[i * 3 + 1], this.vertices[i * 3 + 2]), matrix);
-        // Calculating quad plane normal
-        var normal = WebInspector.Geometry.crossProduct(WebInspector.Geometry.subtract(points[1], points[0]), WebInspector.Geometry.subtract(points[2], points[1]));
-        // General form of the equation of the quad plane: A * x + B * y + C * z + D = 0
-        var A = normal.x;
-        var B = normal.y;
-        var C = normal.z;
-        var D = -(A * points[0].x + B * points[0].y + C * points[0].z);
-        // Finding t from the equation
-        var t = -(D + A * x0 + B * y0) / C;
-        // Point of the intersection
-        var pt = new WebInspector.Geometry.Vector(x0, y0, t);
-        // Vectors from the intersection point to vertices of the quad
-        var tVects = points.map(WebInspector.Geometry.subtract.bind(null, pt));
-        // Intersection point lies inside of the polygon if scalar products of normal of the plane and
-        // cross products of successive tVects are all nonstrictly above or all nonstrictly below zero
-        for (i = 0; i < tVects.length; ++i) {
-            var product = WebInspector.Geometry.scalarProduct(normal, WebInspector.Geometry.crossProduct(tVects[i], tVects[(i + 1) % tVects.length]));
-            if (product < 0)
-                return undefined;
-        }
-        return t;
-    }
-}
-
-/**
- * @constructor
- * @param {!WebInspector.PaintProfilerSnapshot} snapshot
- * @param {!Array.<number>} rect
- * @param {!WebInspector.TracingModel.Event} traceEvent
- */
-WebInspector.LayerTextureManager.Tile = function(snapshot, rect, traceEvent)
-{
-    this.snapshot = snapshot;
-    this.rect = rect;
-    this.traceEvent = traceEvent;
-    this.scale = 0;
-    /** @type {?WebGLTexture} */
-    this.texture = null;
-}