[cc] Initial checkin of cc-frame-viewer

tools/cc-frame-viewer/src/model.js

+/* Copyright (c) 2012 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+'use strict';
+
+base.require('model.layer_tree_host_impl');
+
+base.exportTo('ccfv', function() {
+
+  function unquoteIfNeeded(val) {
+    if (val[0] == '{' && val[val.length - 1] == '}') {
+      return JSON.parse(val);
+    } else {
+      return val;
+    }
+  }
+
+  /**
+   * A generic container for data from a cc trace.
+   *
+   * @constructor
+   */
+  function Model() {
+    this.lthiHistories = {};
+  }
+  Model.prototype = {
+    getOrCreateLTHIHistory: function(id) {
+      if (this.lthiHistories[id] === undefined)
+        this.lthiHistories[id] = new ccfv.model.LayerTreeHostImplHistory(id);
+      return this.lthiHistories[id];
+    },
+
+    initFromTraceEvents: function(trace) {
+      var importer = new TraceImporter();
+      importer.importTraceIntoModel(this, trace);
+    }
+  };
+
+  function TraceImporter() {
+  };
+
+  TraceImporter.prototype = {
+    addWarning: function(msg) {},
+
+    importTraceIntoModel: function(model, trace) {
+      this.model = model;
+
+      var events = trace.traceEvents;
+      for (var i = 0; i < events.length; i++) {
+        var event = events[i];
+        if (event.name == 'Frame')
+          this.handleFrameEvent(event);
+      }
+    },
+
+    handleFrameEvent: function(event) {
+      if (typeof event.args.frame !== 'string')
+        throw new Error('Expected Frame to have args.frame of type string.');
+      var frameData = unquoteIfNeeded(event.args.frame);
+
+      var lthiID;
+      if (frameData.lthi_id === undefined) {
+        // Old versions used compositor_instance instead of lthiID.
+        if (frameData.compositor_instance === undefined)
+          throw new Error('Expected Frame to have a lthi_id field.');
+        lthiID = frameData.compositor_instance;
+      } else {
+        lthiID = frameData.lthi_id;
+      }
+
+      var lthiHistory = this.model.getOrCreateLTHIHistory(lthiID);
+
+      var lthi = lthiHistory.createNewLTHI();
+
+      // Basic properties.
+      if (frameData.device_viewport_size === undefined)
+        throw new Error('Expected device_viewport');
+      lthi.deviceViewportSize = frameData.device_viewport_size;
+
+      // Tiles.
+      if (frameData.tiles === undefined)
+        throw new Error('Expected tiles');
+      frameData.tiles.forEach(function(tile) {
+        this.handleFrameTile(lthi, tile);
+      }, this);
+    },
+
+    handleFrameTile: function(lthi, tileData) {
+      var tileID;
+      if (!tileData.id) {
+        // Some old files dont have id fields. Use picture_pile for backup id.
+        if (!tileData.picture_pile)
+          throw new Error('Tiles must have id');
+        tileID = tileData.picture_pile;
+      } else {
+        tileID = tileData.id;
+      }
+      var tile = lthi.getOrCreateTile(tileID);
+
+      tile.history.picturePile = tileData.picture_pile;
+      tile.history.contentsScale = tileData.contents_scale;
+
+      tile.priority[0] = tileData.priority[0];
+      tile.priority[1] = tileData.priority[1];
+      tile.managedState = tileData.managed_state;
+    }
+  };
+
+
+  return {
+    Model: Model,
+  }
+});
+