Use local pages for webrtc telemetry tests.

tools/perf/page_sets/webrtc_cases/peerconnection_audio_files/graph.js

+/*
+ *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+// taken from chrome://webrtc-internals with jshint adaptions
+
+'use strict';
+/* exported TimelineDataSeries, TimelineGraphView */
+
+// The maximum number of data points bufferred for each stats. Old data points
+// will be shifted out when the buffer is full.
+var MAX_STATS_DATA_POINT_BUFFER_SIZE = 1000;
+
+var TimelineDataSeries = (function() {
+  /**
+   * @constructor
+   */
+  function TimelineDataSeries() {
+    // List of DataPoints in chronological order.
+    this.dataPoints_ = [];
+
+    // Default color.  Should always be overridden prior to display.
+    this.color_ = 'red';
+    // Whether or not the data series should be drawn.
+    this.isVisible_ = true;
+
+    this.cacheStartTime_ = null;
+    this.cacheStepSize_ = 0;
+    this.cacheValues_ = [];
+  }
+
+  TimelineDataSeries.prototype = {
+    /**
+     * @override
+     */
+    toJSON: function() {
+      if (this.dataPoints_.length < 1) {
+        return {};
+      }
+
+      var values = [];
+      for (var i = 0; i < this.dataPoints_.length; ++i) {
+        values.push(this.dataPoints_[i].value);
+      }
+      return {
+        startTime: this.dataPoints_[0].time,
+        endTime: this.dataPoints_[this.dataPoints_.length - 1].time,
+        values: JSON.stringify(values),
+      };
+    },
+
+    /**
+     * Adds a DataPoint to |this| with the specified time and value.
+     * DataPoints are assumed to be received in chronological order.
+     */
+    addPoint: function(timeTicks, value) {
+      var time = new Date(timeTicks);
+      this.dataPoints_.push(new DataPoint(time, value));
+
+      if (this.dataPoints_.length > MAX_STATS_DATA_POINT_BUFFER_SIZE) {
+        this.dataPoints_.shift();
+      }
+    },
+
+    isVisible: function() {
+      return this.isVisible_;
+    },
+
+    show: function(isVisible) {
+      this.isVisible_ = isVisible;
+    },
+
+    getColor: function() {
+      return this.color_;
+    },
+
+    setColor: function(color) {
+      this.color_ = color;
+    },
+
+    getCount: function() {
+      return this.dataPoints_.length;
+    },
+    /**
+     * Returns a list containing the values of the data series at |count|
+     * points, starting at |startTime|, and |stepSize| milliseconds apart.
+     * Caches values, so showing/hiding individual data series is fast.
+     */
+    getValues: function(startTime, stepSize, count) {
+      // Use cached values, if we can.
+      if (this.cacheStartTime_ === startTime &&
+          this.cacheStepSize_ === stepSize &&
+          this.cacheValues_.length === count) {
+        return this.cacheValues_;
+      }
+
+      // Do all the work.
+      this.cacheValues_ = this.getValuesInternal_(startTime, stepSize, count);
+      this.cacheStartTime_ = startTime;
+      this.cacheStepSize_ = stepSize;
+
+      return this.cacheValues_;
+    },
+
+    /**
+     * Returns the cached |values| in the specified time period.
+     */
+    getValuesInternal_: function(startTime, stepSize, count) {
+      var values = [];
+      var nextPoint = 0;
+      var currentValue = 0;
+      var time = startTime;
+      for (var i = 0; i < count; ++i) {
+        while (nextPoint < this.dataPoints_.length &&
+               this.dataPoints_[nextPoint].time < time) {
+          currentValue = this.dataPoints_[nextPoint].value;
+          ++nextPoint;
+        }
+        values[i] = currentValue;
+        time += stepSize;
+      }
+      return values;
+    }
+  };
+
+  /**
+   * A single point in a data series.  Each point has a time, in the form of
+   * milliseconds since the Unix epoch, and a numeric value.
+   * @constructor
+   */
+  function DataPoint(time, value) {
+    this.time = time;
+    this.value = value;
+  }
+
+  return TimelineDataSeries;
+})();
+
+var TimelineGraphView = (function() {
+  // Maximum number of labels placed vertically along the sides of the graph.
+  var MAX_VERTICAL_LABELS = 6;
+
+  // Vertical spacing between labels and between the graph and labels.
+  var LABEL_VERTICAL_SPACING = 4;
+  // Horizontal spacing between vertically placed labels and the edges of the
+  // graph.
+  var LABEL_HORIZONTAL_SPACING = 3;
+  // Horizintal spacing between two horitonally placed labels along the bottom
+  // of the graph.
+  //var LABEL_LABEL_HORIZONTAL_SPACING = 25;
+
+  // Length of ticks, in pixels, next to y-axis labels.  The x-axis only has
+  // one set of labels, so it can use lines instead.
+  var Y_AXIS_TICK_LENGTH = 10;
+
+  var GRID_COLOR = '#CCC';
+  var TEXT_COLOR = '#000';
+  var BACKGROUND_COLOR = '#FFF';
+
+  var MAX_DECIMAL_PRECISION = 2;
+  /**
+   * @constructor
+   */
+  function TimelineGraphView(divId, canvasId) {
+    this.scrollbar_ = {position_: 0, range_: 0};
+
+    this.graphDiv_ = document.getElementById(divId);
+    this.canvas_ = document.getElementById(canvasId);
+
+    // Set the range and scale of the graph.  Times are in milliseconds since
+    // the Unix epoch.
+
+    // All measurements we have must be after this time.
+    this.startTime_ = 0;
+    // The current rightmost position of the graph is always at most this.
+    this.endTime_ = 1;
+
+    this.graph_ = null;
+
+    // Horizontal scale factor, in terms of milliseconds per pixel.
+    this.scale_ = 1000;
+
+    // Initialize the scrollbar.
+    this.updateScrollbarRange_(true);
+  }
+
+  TimelineGraphView.prototype = {
+    setScale: function(scale) {
+      this.scale_ = scale;
+    },
+
+    // Returns the total length of the graph, in pixels.
+    getLength_: function() {
+      var timeRange = this.endTime_ - this.startTime_;
+      // Math.floor is used to ignore the last partial area, of length less
+      // than this.scale_.
+      return Math.floor(timeRange / this.scale_);
+    },
+
+    /**
+     * Returns true if the graph is scrolled all the way to the right.
+     */
+    graphScrolledToRightEdge_: function() {
+      return this.scrollbar_.position_ === this.scrollbar_.range_;
+    },
+
+    /**
+     * Update the range of the scrollbar.  If |resetPosition| is true, also
+     * sets the slider to point at the rightmost position and triggers a
+     * repaint.
+     */
+    updateScrollbarRange_: function(resetPosition) {
+      var scrollbarRange = this.getLength_() - this.canvas_.width;
+      if (scrollbarRange < 0) {
+        scrollbarRange = 0;
+      }
+
+      // If we've decreased the range to less than the current scroll position,
+      // we need to move the scroll position.
+      if (this.scrollbar_.position_ > scrollbarRange) {
+        resetPosition = true;
+      }
+
+      this.scrollbar_.range_ = scrollbarRange;
+      if (resetPosition) {
+        this.scrollbar_.position_ = scrollbarRange;
+        this.repaint();
+      }
+    },
+
+    /**
+     * Sets the date range displayed on the graph, switches to the default
+     * scale factor, and moves the scrollbar all the way to the right.
+     */
+    setDateRange: function(startDate, endDate) {
+      this.startTime_ = startDate.getTime();
+      this.endTime_ = endDate.getTime();
+
+      // Safety check.
+      if (this.endTime_ <= this.startTime_) {
+        this.startTime_ = this.endTime_ - 1;
+      }
+
+      this.updateScrollbarRange_(true);
+    },
+
+    /**
+     * Updates the end time at the right of the graph to be the current time.
+     * Specifically, updates the scrollbar's range, and if the scrollbar is
+     * all the way to the right, keeps it all the way to the right.  Otherwise,
+     * leaves the view as-is and doesn't redraw anything.
+     */
+    updateEndDate: function(optDate) {
+      this.endTime_ = optDate || (new Date()).getTime();
+      this.updateScrollbarRange_(this.graphScrolledToRightEdge_());
+    },
+
+    getStartDate: function() {
+      return new Date(this.startTime_);
+    },
+
+    /**
+     * Replaces the current TimelineDataSeries with |dataSeries|.
+     */
+    setDataSeries: function(dataSeries) {
+      // Simply recreates the Graph.
+      this.graph_ = new Graph();
+      for (var i = 0; i < dataSeries.length; ++i) {
+        this.graph_.addDataSeries(dataSeries[i]);
+      }
+      this.repaint();
+    },
+
+    /**
+    * Adds |dataSeries| to the current graph.
+    */
+    addDataSeries: function(dataSeries) {
+      if (!this.graph_) {
+        this.graph_ = new Graph();
+      }
+      this.graph_.addDataSeries(dataSeries);
+      this.repaint();
+    },
+
+    /**
+     * Draws the graph on |canvas_|.
+     */
+    repaint: function() {
+      this.repaintTimerRunning_ = false;
+
+      var width = this.canvas_.width;
+      var height = this.canvas_.height;
+      var context = this.canvas_.getContext('2d');
+
+      // Clear the canvas.
+      context.fillStyle = BACKGROUND_COLOR;
+      context.fillRect(0, 0, width, height);
+
+      // Try to get font height in pixels.  Needed for layout.
+      var fontHeightString = context.font.match(/([0-9]+)px/)[1];
+      var fontHeight = parseInt(fontHeightString);
+
+      // Safety check, to avoid drawing anything too ugly.
+      if (fontHeightString.length === 0 || fontHeight <= 0 ||
+          fontHeight * 4 > height || width < 50) {
+        return;
+      }
+
+      // Save current transformation matrix so we can restore it later.
+      context.save();
+
+      // The center of an HTML canvas pixel is technically at (0.5, 0.5).  This
+      // makes near straight lines look bad, due to anti-aliasing.  This
+      // translation reduces the problem a little.
+      context.translate(0.5, 0.5);
+
+      // Figure out what time values to display.
+      var position = this.scrollbar_.position_;
+      // If the entire time range is being displayed, align the right edge of
+      // the graph to the end of the time range.
+      if (this.scrollbar_.range_ === 0) {
+        position = this.getLength_() - this.canvas_.width;
+      }
+      var visibleStartTime = this.startTime_ + position * this.scale_;
+
+      // Make space at the bottom of the graph for the time labels, and then
+      // draw the labels.
+      var textHeight = height;
+      height -= fontHeight + LABEL_VERTICAL_SPACING;
+      this.drawTimeLabels(context, width, height, textHeight, visibleStartTime);
+
+      // Draw outline of the main graph area.
+      context.strokeStyle = GRID_COLOR;
+      context.strokeRect(0, 0, width - 1, height - 1);
+
+      if (this.graph_) {
+        // Layout graph and have them draw their tick marks.
+        this.graph_.layout(
+            width, height, fontHeight, visibleStartTime, this.scale_);
+        this.graph_.drawTicks(context);
+
+        // Draw the lines of all graphs, and then draw their labels.
+        this.graph_.drawLines(context);
+        this.graph_.drawLabels(context);
+      }
+
+      // Restore original transformation matrix.
+      context.restore();
+    },
+
+    /**
+     * Draw time labels below the graph.  Takes in start time as an argument
+     * since it may not be |startTime_|, when we're displaying the entire
+     * time range.
+     */
+    drawTimeLabels: function(context, width, height, textHeight, startTime) {
+      // Draw the labels 1 minute apart.
+      var timeStep = 1000 * 60;
+
+      // Find the time for the first label.  This time is a perfect multiple of
+      // timeStep because of how UTC times work.
+      var time = Math.ceil(startTime / timeStep) * timeStep;
+
+      context.textBaseline = 'bottom';
+      context.textAlign = 'center';
+      context.fillStyle = TEXT_COLOR;
+      context.strokeStyle = GRID_COLOR;
+
+      // Draw labels and vertical grid lines.
+      while (true) {
+        var x = Math.round((time - startTime) / this.scale_);
+        if (x >= width) {
+          break;
+        }
+        var text = (new Date(time)).toLocaleTimeString();
+        context.fillText(text, x, textHeight);
+        context.beginPath();
+        context.lineTo(x, 0);
+        context.lineTo(x, height);
+        context.stroke();
+        time += timeStep;
+      }
+    },
+
+    getDataSeriesCount: function() {
+      if (this.graph_) {
+        return this.graph_.dataSeries_.length;
+      }
+      return 0;
+    },
+
+    hasDataSeries: function(dataSeries) {
+      if (this.graph_) {
+        return this.graph_.hasDataSeries(dataSeries);
+      }
+      return false;
+    },
+
+  };
+
+  /**
+   * A Graph is responsible for drawing all the TimelineDataSeries that have
+   * the same data type.  Graphs are responsible for scaling the values, laying
+   * out labels, and drawing both labels and lines for its data series.
+   */
+  var Graph = (function() {
+    /**
+     * @constructor
+     */
+    function Graph() {
+      this.dataSeries_ = [];
+
+      // Cached properties of the graph, set in layout.
+      this.width_ = 0;
+      this.height_ = 0;
+      this.fontHeight_ = 0;
+      this.startTime_ = 0;
+      this.scale_ = 0;
+
+      // The lowest/highest values adjusted by the vertical label step size
+      // in the displayed range of the graph. Used for scaling and setting
+      // labels.  Set in layoutLabels.
+      this.min_ = 0;
+      this.max_ = 0;
+
+      // Cached text of equally spaced labels.  Set in layoutLabels.
+      this.labels_ = [];
+    }
+
+    /**
+     * A Label is the label at a particular position along the y-axis.
+     * @constructor
+     */
+    /*
+    function Label(height, text) {
+      this.height = height;
+      this.text = text;
+    }
+    */
+
+    Graph.prototype = {
+      addDataSeries: function(dataSeries) {
+        this.dataSeries_.push(dataSeries);
+      },
+
+      hasDataSeries: function(dataSeries) {
+        for (var i = 0; i < this.dataSeries_.length; ++i) {
+          if (this.dataSeries_[i] === dataSeries) {
+            return true;
+          }
+        }
+        return false;
+      },
+
+      /**
+       * Returns a list of all the values that should be displayed for a given
+       * data series, using the current graph layout.
+       */
+      getValues: function(dataSeries) {
+        if (!dataSeries.isVisible()) {
+          return null;
+        }
+        return dataSeries.getValues(this.startTime_, this.scale_, this.width_);
+      },
+
+      /**
+       * Updates the graph's layout.  In particular, both the max value and
+       * label positions are updated.  Must be called before calling any of the
+       * drawing functions.
+       */
+      layout: function(width, height, fontHeight, startTime, scale) {
+        this.width_ = width;
+        this.height_ = height;
+        this.fontHeight_ = fontHeight;
+        this.startTime_ = startTime;
+        this.scale_ = scale;
+
+        // Find largest value.
+        var max = 0;
+        var min = 0;
+        for (var i = 0; i < this.dataSeries_.length; ++i) {
+          var values = this.getValues(this.dataSeries_[i]);
+          if (!values) {
+            continue;
+          }
+          for (var j = 0; j < values.length; ++j) {
+            if (values[j] > max) {
+              max = values[j];
+            } else if (values[j] < min) {
+              min = values[j];
+            }
+          }
+        }
+
+        this.layoutLabels_(min, max);
+      },
+
+      /**
+       * Lays out labels and sets |max_|/|min_|, taking the time units into
+       * consideration.  |maxValue| is the actual maximum value, and
+       * |max_| will be set to the value of the largest label, which
+       * will be at least |maxValue|. Similar for |min_|.
+       */
+      layoutLabels_: function(minValue, maxValue) {
+        if (maxValue - minValue < 1024) {
+          this.layoutLabelsBasic_(minValue, maxValue, MAX_DECIMAL_PRECISION);
+          return;
+        }
+
+        // Find appropriate units to use.
+        var units = ['', 'k', 'M', 'G', 'T', 'P'];
+        // Units to use for labels.  0 is '1', 1 is K, etc.
+        // We start with 1, and work our way up.
+        var unit = 1;
+        minValue /= 1024;
+        maxValue /= 1024;
+        while (units[unit + 1] && maxValue - minValue >= 1024) {
+          minValue /= 1024;
+          maxValue /= 1024;
+          ++unit;
+        }
+
+        // Calculate labels.
+        this.layoutLabelsBasic_(minValue, maxValue, MAX_DECIMAL_PRECISION);
+
+        // Append units to labels.
+        for (var i = 0; i < this.labels_.length; ++i) {
+          this.labels_[i] += ' ' + units[unit];
+        }
+
+        // Convert |min_|/|max_| back to unit '1'.
+        this.min_ *= Math.pow(1024, unit);
+        this.max_ *= Math.pow(1024, unit);
+      },
+
+      /**
+       * Same as layoutLabels_, but ignores units.  |maxDecimalDigits| is the
+       * maximum number of decimal digits allowed.  The minimum allowed
+       * difference between two adjacent labels is 10^-|maxDecimalDigits|.
+       */
+      layoutLabelsBasic_: function(minValue, maxValue, maxDecimalDigits) {
+        this.labels_ = [];
+        var range = maxValue - minValue;
+        // No labels if the range is 0.
+        if (range === 0) {
+          this.min_ = this.max_ = maxValue;
+          return;
+        }
+
+        // The maximum number of equally spaced labels allowed.  |fontHeight_|
+        // is doubled because the top two labels are both drawn in the same
+        // gap.
+        var minLabelSpacing = 2 * this.fontHeight_ + LABEL_VERTICAL_SPACING;
+
+        // The + 1 is for the top label.
+        var maxLabels = 1 + this.height_ / minLabelSpacing;
+        if (maxLabels < 2) {
+          maxLabels = 2;
+        } else if (maxLabels > MAX_VERTICAL_LABELS) {
+          maxLabels = MAX_VERTICAL_LABELS;
+        }
+
+        // Initial try for step size between conecutive labels.
+        var stepSize = Math.pow(10, -maxDecimalDigits);
+        // Number of digits to the right of the decimal of |stepSize|.
+        // Used for formating label strings.
+        var stepSizeDecimalDigits = maxDecimalDigits;
+
+        // Pick a reasonable step size.
+        while (true) {
+          // If we use a step size of |stepSize| between labels, we'll need:
+          //
+          // Math.ceil(range / stepSize) + 1
+          //
+          // labels.  The + 1 is because we need labels at both at 0 and at
+          // the top of the graph.
+
+          // Check if we can use steps of size |stepSize|.
+          if (Math.ceil(range / stepSize) + 1 <= maxLabels) {
+            break;
+          }
+          // Check |stepSize| * 2.
+          if (Math.ceil(range / (stepSize * 2)) + 1 <= maxLabels) {
+            stepSize *= 2;
+            break;
+          }
+          // Check |stepSize| * 5.
+          if (Math.ceil(range / (stepSize * 5)) + 1 <= maxLabels) {
+            stepSize *= 5;
+            break;
+          }
+          stepSize *= 10;
+          if (stepSizeDecimalDigits > 0) {
+            --stepSizeDecimalDigits;
+          }
+        }
+
+        // Set the min/max so it's an exact multiple of the chosen step size.
+        this.max_ = Math.ceil(maxValue / stepSize) * stepSize;
+        this.min_ = Math.floor(minValue / stepSize) * stepSize;
+
+        // Create labels.
+        for (var label = this.max_; label >= this.min_; label -= stepSize) {
+          this.labels_.push(label.toFixed(stepSizeDecimalDigits));
+        }
+      },
+
+      /**
+       * Draws tick marks for each of the labels in |labels_|.
+       */
+      drawTicks: function(context) {
+        var x1;
+        var x2;
+        x1 = this.width_ - 1;
+        x2 = this.width_ - 1 - Y_AXIS_TICK_LENGTH;
+
+        context.fillStyle = GRID_COLOR;
+        context.beginPath();
+        for (var i = 1; i < this.labels_.length - 1; ++i) {
+          // The rounding is needed to avoid ugly 2-pixel wide anti-aliased
+          // lines.
+          var y = Math.round(this.height_ * i / (this.labels_.length - 1));
+          context.moveTo(x1, y);
+          context.lineTo(x2, y);
+        }
+        context.stroke();
+      },
+
+      /**
+       * Draws a graph line for each of the data series.
+       */
+      drawLines: function(context) {
+        // Factor by which to scale all values to convert them to a number from
+        // 0 to height - 1.
+        var scale = 0;
+        var bottom = this.height_ - 1;
+        if (this.max_) {
+          scale = bottom / (this.max_ - this.min_);
+        }
+
+        // Draw in reverse order, so earlier data series are drawn on top of
+        // subsequent ones.
+        for (var i = this.dataSeries_.length - 1; i >= 0; --i) {
+          var values = this.getValues(this.dataSeries_[i]);
+          if (!values) {
+            continue;
+          }
+          context.strokeStyle = this.dataSeries_[i].getColor();
+          context.beginPath();
+          for (var x = 0; x < values.length; ++x) {
+            // The rounding is needed to avoid ugly 2-pixel wide anti-aliased
+            // horizontal lines.
+            context.lineTo(
+                x, bottom - Math.round((values[x] - this.min_) * scale));
+          }
+          context.stroke();
+        }
+      },
+
+      /**
+       * Draw labels in |labels_|.
+       */
+      drawLabels: function(context) {
+        if (this.labels_.length === 0) {
+          return;
+        }
+        var x = this.width_ - LABEL_HORIZONTAL_SPACING;
+
+        // Set up the context.
+        context.fillStyle = TEXT_COLOR;
+        context.textAlign = 'right';
+
+        // Draw top label, which is the only one that appears below its tick
+        // mark.
+        context.textBaseline = 'top';
+        context.fillText(this.labels_[0], x, 0);
+
+        // Draw all the other labels.
+        context.textBaseline = 'bottom';
+        var step = (this.height_ - 1) / (this.labels_.length - 1);
+        for (var i = 1; i < this.labels_.length; ++i) {
+          context.fillText(this.labels_[i], x, step * i);
+        }
+      }
+    };
+
+    return Graph;
+  })();
+
+  return TimelineGraphView;
+})();