openlayers-test/src/ol/render/canvas/canvasreplay.js

Build tools and sources for developing OpenLayers based mapping applications

// FIXME add option to apply snapToPixel to all coordinates?
// FIXME can eliminate empty set styles and strokes (when all geoms skipped)

goog.provide('ol.render.canvas.Replay');
goog.provide('ol.render.canvas.ReplayGroup');

goog.require('goog.array');
goog.require('goog.asserts');
goog.require('goog.object');
goog.require('goog.vec.Mat4');
goog.require('ol.array');
goog.require('ol.color');
goog.require('ol.dom');
goog.require('ol.extent');
goog.require('ol.extent.Relationship');
goog.require('ol.geom.flat.simplify');
goog.require('ol.geom.flat.transform');
goog.require('ol.has');
goog.require('ol.render.IReplayGroup');
goog.require('ol.render.IVectorContext');
goog.require('ol.render.canvas');
goog.require('ol.vec.Mat4');


/**
 * @enum {number}
 */
ol.render.canvas.Instruction = {
  BEGIN_GEOMETRY: 0,
  BEGIN_PATH: 1,
  CIRCLE: 2,
  CLOSE_PATH: 3,
  DRAW_IMAGE: 4,
  DRAW_TEXT: 5,
  END_GEOMETRY: 6,
  FILL: 7,
  MOVE_TO_LINE_TO: 8,
  SET_FILL_STYLE: 9,
  SET_STROKE_STYLE: 10,
  SET_TEXT_STYLE: 11,
  STROKE: 12
};



/**
 * @constructor
 * @implements {ol.render.IVectorContext}
 * @param {number} tolerance Tolerance.
 * @param {ol.Extent} maxExtent Maximum extent.
 * @param {number} resolution Resolution.
 * @protected
 * @struct
 */
ol.render.canvas.Replay = function(tolerance, maxExtent, resolution) {

  /**
   * @protected
   * @type {number}
   */
  this.tolerance = tolerance;

  /**
   * @protected
   * @type {ol.Extent}
   */
  this.maxExtent = maxExtent;

  /**
   * @protected
   * @type {number}
   */
  this.maxLineWidth = 0;

  /**
   * @protected
   * @type {number}
   */
  this.resolution = resolution;

  /**
   * @private
   * @type {Array.<*>}
   */
  this.beginGeometryInstruction1_ = null;

  /**
   * @private
   * @type {Array.<*>}
   */
  this.beginGeometryInstruction2_ = null;

  /**
   * @protected
   * @type {Array.<*>}
   */
  this.instructions = [];

  /**
   * @protected
   * @type {Array.<number>}
   */
  this.coordinates = [];

  /**
   * @private
   * @type {goog.vec.Mat4.Number}
   */
  this.renderedTransform_ = goog.vec.Mat4.createNumber();

  /**
   * @protected
   * @type {Array.<*>}
   */
  this.hitDetectionInstructions = [];

  /**
   * @private
   * @type {Array.<number>}
   */
  this.pixelCoordinates_ = [];

  /**
   * @private
   * @type {!goog.vec.Mat4.Number}
   */
  this.tmpLocalTransform_ = goog.vec.Mat4.createNumber();

};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {boolean} close Close.
 * @protected
 * @return {number} My end.
 */
ol.render.canvas.Replay.prototype.appendFlatCoordinates =
    function(flatCoordinates, offset, end, stride, close) {

  var myEnd = this.coordinates.length;
  var extent = this.getBufferedMaxExtent();
  var lastCoord = [flatCoordinates[offset], flatCoordinates[offset + 1]];
  var nextCoord = [NaN, NaN];
  var skipped = true;

  var i, lastRel, nextRel;
  for (i = offset + stride; i < end; i += stride) {
    nextCoord[0] = flatCoordinates[i];
    nextCoord[1] = flatCoordinates[i + 1];
    nextRel = ol.extent.coordinateRelationship(extent, nextCoord);
    if (nextRel !== lastRel) {
      if (skipped) {
        this.coordinates[myEnd++] = lastCoord[0];
        this.coordinates[myEnd++] = lastCoord[1];
      }
      this.coordinates[myEnd++] = nextCoord[0];
      this.coordinates[myEnd++] = nextCoord[1];
      skipped = false;
    } else if (nextRel === ol.extent.Relationship.INTERSECTING) {
      this.coordinates[myEnd++] = nextCoord[0];
      this.coordinates[myEnd++] = nextCoord[1];
      skipped = false;
    } else {
      skipped = true;
    }
    lastCoord[0] = nextCoord[0];
    lastCoord[1] = nextCoord[1];
    lastRel = nextRel;
  }

  // handle case where there is only one point to append
  if (i === offset + stride) {
    this.coordinates[myEnd++] = lastCoord[0];
    this.coordinates[myEnd++] = lastCoord[1];
  }

  if (close) {
    this.coordinates[myEnd++] = flatCoordinates[offset];
    this.coordinates[myEnd++] = flatCoordinates[offset + 1];
  }
  return myEnd;
};


/**
 * @protected
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {ol.Feature} feature Feature.
 */
ol.render.canvas.Replay.prototype.beginGeometry = function(geometry, feature) {
  this.beginGeometryInstruction1_ =
      [ol.render.canvas.Instruction.BEGIN_GEOMETRY, feature, 0];
  this.instructions.push(this.beginGeometryInstruction1_);
  this.beginGeometryInstruction2_ =
      [ol.render.canvas.Instruction.BEGIN_GEOMETRY, feature, 0];
  this.hitDetectionInstructions.push(this.beginGeometryInstruction2_);
};


/**
 * @private
 * @param {CanvasRenderingContext2D} context Context.
 * @param {number} pixelRatio Pixel ratio.
 * @param {goog.vec.Mat4.Number} transform Transform.
 * @param {number} viewRotation View rotation.
 * @param {Object} skippedFeaturesHash Ids of features to skip.
 * @param {Array.<*>} instructions Instructions array.
 * @param {function(ol.Feature): T|undefined} featureCallback Feature callback.
 * @return {T|undefined} Callback result.
 * @template T
 */
ol.render.canvas.Replay.prototype.replay_ = function(
    context, pixelRatio, transform, viewRotation, skippedFeaturesHash,
    instructions, featureCallback) {
  /** @type {Array.<number>} */
  var pixelCoordinates;
  if (ol.vec.Mat4.equals2D(transform, this.renderedTransform_)) {
    pixelCoordinates = this.pixelCoordinates_;
  } else {
    pixelCoordinates = ol.geom.flat.transform.transform2D(
        this.coordinates, 0, this.coordinates.length, 2,
        transform, this.pixelCoordinates_);
    goog.vec.Mat4.setFromArray(this.renderedTransform_, transform);
    goog.asserts.assert(pixelCoordinates === this.pixelCoordinates_);
  }
  var i = 0; // instruction index
  var ii = instructions.length; // end of instructions
  var d = 0; // data index
  var dd; // end of per-instruction data
  var localTransform = this.tmpLocalTransform_;
  while (i < ii) {
    var instruction = instructions[i];
    var type = /** @type {ol.render.canvas.Instruction} */ (instruction[0]);
    var feature, fill, stroke, text, x, y;
    switch (type) {
      case ol.render.canvas.Instruction.BEGIN_GEOMETRY:
        feature = /** @type {ol.Feature} */ (instruction[1]);
        var featureUid = goog.getUid(feature).toString();
        if (!goog.isDef(goog.object.get(skippedFeaturesHash, featureUid))) {
          ++i;
        } else {
          i = /** @type {number} */ (instruction[2]);
        }
        break;
      case ol.render.canvas.Instruction.BEGIN_PATH:
        context.beginPath();
        ++i;
        break;
      case ol.render.canvas.Instruction.CIRCLE:
        goog.asserts.assert(goog.isNumber(instruction[1]));
        d = /** @type {number} */ (instruction[1]);
        var x1 = pixelCoordinates[d];
        var y1 = pixelCoordinates[d + 1];
        var x2 = pixelCoordinates[d + 2];
        var y2 = pixelCoordinates[d + 3];
        var dx = x2 - x1;
        var dy = y2 - y1;
        var r = Math.sqrt(dx * dx + dy * dy);
        context.arc(x1, y1, r, 0, 2 * Math.PI, true);
        ++i;
        break;
      case ol.render.canvas.Instruction.CLOSE_PATH:
        context.closePath();
        ++i;
        break;
      case ol.render.canvas.Instruction.DRAW_IMAGE:
        goog.asserts.assert(goog.isNumber(instruction[1]));
        d = /** @type {number} */ (instruction[1]);
        goog.asserts.assert(goog.isNumber(instruction[2]));
        dd = /** @type {number} */ (instruction[2]);
        var image =  /** @type {HTMLCanvasElement|HTMLVideoElement|Image} */
            (instruction[3]);
        // Remaining arguments in DRAW_IMAGE are in alphabetical order
        var anchorX = /** @type {number} */ (instruction[4]) * pixelRatio;
        var anchorY = /** @type {number} */ (instruction[5]) * pixelRatio;
        var height = /** @type {number} */ (instruction[6]);
        var opacity = /** @type {number} */ (instruction[7]);
        var originX = /** @type {number} */ (instruction[8]);
        var originY = /** @type {number} */ (instruction[9]);
        var rotateWithView = /** @type {boolean} */ (instruction[10]);
        var rotation = /** @type {number} */ (instruction[11]);
        var scale = /** @type {number} */ (instruction[12]);
        var snapToPixel = /** @type {boolean} */ (instruction[13]);
        var width = /** @type {number} */ (instruction[14]);
        if (rotateWithView) {
          rotation += viewRotation;
        }
        for (; d < dd; d += 2) {
          x = pixelCoordinates[d] - anchorX;
          y = pixelCoordinates[d + 1] - anchorY;
          if (snapToPixel) {
            x = (x + 0.5) | 0;
            y = (y + 0.5) | 0;
          }
          if (scale != 1 || rotation !== 0) {
            var centerX = x + anchorX;
            var centerY = y + anchorY;
            ol.vec.Mat4.makeTransform2D(
                localTransform, centerX, centerY, scale, scale,
                rotation, -centerX, -centerY);
            context.setTransform(
                goog.vec.Mat4.getElement(localTransform, 0, 0),
                goog.vec.Mat4.getElement(localTransform, 1, 0),
                goog.vec.Mat4.getElement(localTransform, 0, 1),
                goog.vec.Mat4.getElement(localTransform, 1, 1),
                goog.vec.Mat4.getElement(localTransform, 0, 3),
                goog.vec.Mat4.getElement(localTransform, 1, 3));
          }
          var alpha = context.globalAlpha;
          if (opacity != 1) {
            context.globalAlpha = alpha * opacity;
          }

          context.drawImage(image, originX, originY, width, height,
              x, y, width * pixelRatio, height * pixelRatio);

          if (opacity != 1) {
            context.globalAlpha = alpha;
          }
          if (scale != 1 || rotation !== 0) {
            context.setTransform(1, 0, 0, 1, 0, 0);
          }
        }
        ++i;
        break;
      case ol.render.canvas.Instruction.DRAW_TEXT:
        goog.asserts.assert(goog.isNumber(instruction[1]));
        d = /** @type {number} */ (instruction[1]);
        goog.asserts.assert(goog.isNumber(instruction[2]));
        dd = /** @type {number} */ (instruction[2]);
        goog.asserts.assert(goog.isString(instruction[3]));
        text = /** @type {string} */ (instruction[3]);
        goog.asserts.assert(goog.isNumber(instruction[4]));
        var offsetX = /** @type {number} */ (instruction[4]) * pixelRatio;
        goog.asserts.assert(goog.isNumber(instruction[5]));
        var offsetY = /** @type {number} */ (instruction[5]) * pixelRatio;
        goog.asserts.assert(goog.isNumber(instruction[6]));
        rotation = /** @type {number} */ (instruction[6]);
        goog.asserts.assert(goog.isNumber(instruction[7]));
        scale = /** @type {number} */ (instruction[7]) * pixelRatio;
        goog.asserts.assert(goog.isBoolean(instruction[8]));
        fill = /** @type {boolean} */ (instruction[8]);
        goog.asserts.assert(goog.isBoolean(instruction[9]));
        stroke = /** @type {boolean} */ (instruction[9]);
        for (; d < dd; d += 2) {
          x = pixelCoordinates[d] + offsetX;
          y = pixelCoordinates[d + 1] + offsetY;
          if (scale != 1 || rotation !== 0) {
            ol.vec.Mat4.makeTransform2D(
                localTransform, x, y, scale, scale, rotation, -x, -y);
            context.setTransform(
                goog.vec.Mat4.getElement(localTransform, 0, 0),
                goog.vec.Mat4.getElement(localTransform, 1, 0),
                goog.vec.Mat4.getElement(localTransform, 0, 1),
                goog.vec.Mat4.getElement(localTransform, 1, 1),
                goog.vec.Mat4.getElement(localTransform, 0, 3),
                goog.vec.Mat4.getElement(localTransform, 1, 3));
          }
          if (stroke) {
            context.strokeText(text, x, y);
          }
          if (fill) {
            context.fillText(text, x, y);
          }
          if (scale != 1 || rotation !== 0) {
            context.setTransform(1, 0, 0, 1, 0, 0);
          }
        }
        ++i;
        break;
      case ol.render.canvas.Instruction.END_GEOMETRY:
        if (goog.isDef(featureCallback)) {
          feature = /** @type {ol.Feature} */ (instruction[1]);
          var result = featureCallback(feature);
          if (result) {
            return result;
          }
        }
        ++i;
        break;
      case ol.render.canvas.Instruction.FILL:
        context.fill();
        ++i;
        break;
      case ol.render.canvas.Instruction.MOVE_TO_LINE_TO:
        goog.asserts.assert(goog.isNumber(instruction[1]));
        d = /** @type {number} */ (instruction[1]);
        goog.asserts.assert(goog.isNumber(instruction[2]));
        dd = /** @type {number} */ (instruction[2]);
        context.moveTo(pixelCoordinates[d], pixelCoordinates[d + 1]);
        for (d += 2; d < dd; d += 2) {
          context.lineTo(pixelCoordinates[d], pixelCoordinates[d + 1]);
        }
        ++i;
        break;
      case ol.render.canvas.Instruction.SET_FILL_STYLE:
        goog.asserts.assert(goog.isString(instruction[1]));
        context.fillStyle = /** @type {string} */ (instruction[1]);
        ++i;
        break;
      case ol.render.canvas.Instruction.SET_STROKE_STYLE:
        goog.asserts.assert(goog.isString(instruction[1]));
        goog.asserts.assert(goog.isNumber(instruction[2]));
        goog.asserts.assert(goog.isString(instruction[3]));
        goog.asserts.assert(goog.isString(instruction[4]));
        goog.asserts.assert(goog.isNumber(instruction[5]));
        goog.asserts.assert(!goog.isNull(instruction[6]));
        var usePixelRatio = goog.isDef(instruction[7]) ? instruction[7] : true;
        var lineWidth = /** @type {number} */ (instruction[2]);
        context.strokeStyle = /** @type {string} */ (instruction[1]);
        context.lineWidth = usePixelRatio ? lineWidth * pixelRatio : lineWidth;
        context.lineCap = /** @type {string} */ (instruction[3]);
        context.lineJoin = /** @type {string} */ (instruction[4]);
        context.miterLimit = /** @type {number} */ (instruction[5]);
        if (ol.has.CANVAS_LINE_DASH) {
          context.setLineDash(/** @type {Array.<number>} */ (instruction[6]));
        }
        ++i;
        break;
      case ol.render.canvas.Instruction.SET_TEXT_STYLE:
        goog.asserts.assert(goog.isString(instruction[1]));
        goog.asserts.assert(goog.isString(instruction[2]));
        goog.asserts.assert(goog.isString(instruction[3]));
        context.font = /** @type {string} */ (instruction[1]);
        context.textAlign = /** @type {string} */ (instruction[2]);
        context.textBaseline = /** @type {string} */ (instruction[3]);
        ++i;
        break;
      case ol.render.canvas.Instruction.STROKE:
        context.stroke();
        ++i;
        break;
      default:
        goog.asserts.fail();
        ++i; // consume the instruction anyway, to avoid an infinite loop
        break;
    }
  }
  // assert that all instructions were consumed
  goog.asserts.assert(i == instructions.length);
  return undefined;
};


/**
 * @param {CanvasRenderingContext2D} context Context.
 * @param {number} pixelRatio Pixel ratio.
 * @param {goog.vec.Mat4.Number} transform Transform.
 * @param {number} viewRotation View rotation.
 * @param {Object} skippedFeaturesHash Ids of features to skip
 */
ol.render.canvas.Replay.prototype.replay = function(
    context, pixelRatio, transform, viewRotation, skippedFeaturesHash) {
  var instructions = this.instructions;
  this.replay_(context, pixelRatio, transform, viewRotation,
      skippedFeaturesHash, instructions, undefined);
};


/**
 * @param {CanvasRenderingContext2D} context Context.
 * @param {goog.vec.Mat4.Number} transform Transform.
 * @param {number} viewRotation View rotation.
 * @param {Object} skippedFeaturesHash Ids of features to skip
 * @param {function(ol.Feature): T=} opt_featureCallback Feature callback.
 * @return {T|undefined} Callback result.
 * @template T
 */
ol.render.canvas.Replay.prototype.replayHitDetection = function(
    context, transform, viewRotation, skippedFeaturesHash,
    opt_featureCallback) {
  var instructions = this.hitDetectionInstructions;
  return this.replay_(context, 1, transform, viewRotation,
      skippedFeaturesHash, instructions, opt_featureCallback);
};


/**
 * @private
 */
ol.render.canvas.Replay.prototype.reverseHitDetectionInstructions_ =
    function() {
  var hitDetectionInstructions = this.hitDetectionInstructions;
  // step 1 - reverse array
  hitDetectionInstructions.reverse();
  // step 2 - reverse instructions within geometry blocks
  var i;
  var n = hitDetectionInstructions.length;
  var instruction;
  var type;
  var begin = -1;
  for (i = 0; i < n; ++i) {
    instruction = hitDetectionInstructions[i];
    type = /** @type {ol.render.canvas.Instruction} */ (instruction[0]);
    if (type == ol.render.canvas.Instruction.END_GEOMETRY) {
      goog.asserts.assert(begin == -1);
      begin = i;
    } else if (type == ol.render.canvas.Instruction.BEGIN_GEOMETRY) {
      instruction[2] = i;
      goog.asserts.assert(begin >= 0);
      ol.array.reverseSubArray(this.hitDetectionInstructions, begin, i);
      begin = -1;
    }
  }
};


/**
 * @inheritDoc
 */
ol.render.canvas.Replay.prototype.drawAsync = goog.abstractMethod;


/**
 * @inheritDoc
 */
ol.render.canvas.Replay.prototype.drawCircleGeometry = goog.abstractMethod;


/**
 * @inheritDoc
 */
ol.render.canvas.Replay.prototype.drawFeature = goog.abstractMethod;


/**
 * @inheritDoc
 */
ol.render.canvas.Replay.prototype.drawGeometryCollectionGeometry =
    goog.abstractMethod;


/**
 * @inheritDoc
 */
ol.render.canvas.Replay.prototype.drawLineStringGeometry = goog.abstractMethod;


/**
 * @inheritDoc
 */
ol.render.canvas.Replay.prototype.drawMultiLineStringGeometry =
    goog.abstractMethod;


/**
 * @inheritDoc
 */
ol.render.canvas.Replay.prototype.drawPointGeometry = goog.abstractMethod;


/**
 * @inheritDoc
 */
ol.render.canvas.Replay.prototype.drawMultiPointGeometry = goog.abstractMethod;


/**
 * @inheritDoc
 */
ol.render.canvas.Replay.prototype.drawPolygonGeometry = goog.abstractMethod;


/**
 * @inheritDoc
 */
ol.render.canvas.Replay.prototype.drawMultiPolygonGeometry =
    goog.abstractMethod;


/**
 * @inheritDoc
 */
ol.render.canvas.Replay.prototype.drawText = goog.abstractMethod;


/**
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {ol.Feature} feature Feature.
 */
ol.render.canvas.Replay.prototype.endGeometry = function(geometry, feature) {
  goog.asserts.assert(!goog.isNull(this.beginGeometryInstruction1_));
  this.beginGeometryInstruction1_[2] = this.instructions.length;
  this.beginGeometryInstruction1_ = null;
  goog.asserts.assert(!goog.isNull(this.beginGeometryInstruction2_));
  this.beginGeometryInstruction2_[2] = this.hitDetectionInstructions.length;
  this.beginGeometryInstruction2_ = null;
  var endGeometryInstruction =
      [ol.render.canvas.Instruction.END_GEOMETRY, feature];
  this.instructions.push(endGeometryInstruction);
  this.hitDetectionInstructions.push(endGeometryInstruction);
};


/**
 * FIXME empty description for jsdoc
 */
ol.render.canvas.Replay.prototype.finish = goog.nullFunction;


/**
 * Get the buffered rendering extent.  Rendering will be clipped to the extent
 * provided to the constructor.  To account for symbolizers that may intersect
 * this extent, we calculate a buffered extent (e.g. based on stroke width).
 * @return {ol.Extent} The buffered rendering extent.
 * @protected
 */
ol.render.canvas.Replay.prototype.getBufferedMaxExtent = function() {
  return this.maxExtent;
};


/**
 * @inheritDoc
 */
ol.render.canvas.Replay.prototype.setFillStrokeStyle = goog.abstractMethod;


/**
 * @inheritDoc
 */
ol.render.canvas.Replay.prototype.setImageStyle = goog.abstractMethod;


/**
 * @inheritDoc
 */
ol.render.canvas.Replay.prototype.setTextStyle = goog.abstractMethod;



/**
 * @constructor
 * @extends {ol.render.canvas.Replay}
 * @param {number} tolerance Tolerance.
 * @param {ol.Extent} maxExtent Maximum extent.
 * @param {number} resolution Resolution.
 * @protected
 * @struct
 */
ol.render.canvas.ImageReplay = function(tolerance, maxExtent, resolution) {

  goog.base(this, tolerance, maxExtent, resolution);

  /**
   * @private
   * @type {HTMLCanvasElement|HTMLVideoElement|Image}
   */
  this.hitDetectionImage_ = null;

  /**
   * @private
   * @type {HTMLCanvasElement|HTMLVideoElement|Image}
   */
  this.image_ = null;

  /**
   * @private
   * @type {number|undefined}
   */
  this.anchorX_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.anchorY_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.height_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.opacity_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.originX_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.originY_ = undefined;

  /**
   * @private
   * @type {boolean|undefined}
   */
  this.rotateWithView_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.rotation_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.scale_ = undefined;

  /**
   * @private
   * @type {boolean|undefined}
   */
  this.snapToPixel_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.width_ = undefined;

};
goog.inherits(ol.render.canvas.ImageReplay, ol.render.canvas.Replay);


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @private
 * @return {number} My end.
 */
ol.render.canvas.ImageReplay.prototype.drawCoordinates_ =
    function(flatCoordinates, offset, end, stride) {
  return this.appendFlatCoordinates(
      flatCoordinates, offset, end, stride, false);
};


/**
 * @inheritDoc
 */
ol.render.canvas.ImageReplay.prototype.drawPointGeometry =
    function(pointGeometry, feature) {
  if (goog.isNull(this.image_)) {
    return;
  }
  goog.asserts.assert(goog.isDef(this.anchorX_));
  goog.asserts.assert(goog.isDef(this.anchorY_));
  goog.asserts.assert(goog.isDef(this.height_));
  goog.asserts.assert(goog.isDef(this.opacity_));
  goog.asserts.assert(goog.isDef(this.originX_));
  goog.asserts.assert(goog.isDef(this.originY_));
  goog.asserts.assert(goog.isDef(this.rotateWithView_));
  goog.asserts.assert(goog.isDef(this.rotation_));
  goog.asserts.assert(goog.isDef(this.scale_));
  goog.asserts.assert(goog.isDef(this.width_));
  this.beginGeometry(pointGeometry, feature);
  var flatCoordinates = pointGeometry.getFlatCoordinates();
  var stride = pointGeometry.getStride();
  var myBegin = this.coordinates.length;
  var myEnd = this.drawCoordinates_(
      flatCoordinates, 0, flatCoordinates.length, stride);
  this.instructions.push([
    ol.render.canvas.Instruction.DRAW_IMAGE, myBegin, myEnd, this.image_,
    // Remaining arguments to DRAW_IMAGE are in alphabetical order
    this.anchorX_, this.anchorY_, this.height_, this.opacity_,
    this.originX_, this.originY_, this.rotateWithView_, this.rotation_,
    this.scale_, this.snapToPixel_, this.width_
  ]);
  this.hitDetectionInstructions.push([
    ol.render.canvas.Instruction.DRAW_IMAGE, myBegin, myEnd,
    this.hitDetectionImage_,
    // Remaining arguments to DRAW_IMAGE are in alphabetical order
    this.anchorX_, this.anchorY_, this.height_, this.opacity_,
    this.originX_, this.originY_, this.rotateWithView_, this.rotation_,
    this.scale_, this.snapToPixel_, this.width_
  ]);
  this.endGeometry(pointGeometry, feature);
};


/**
 * @inheritDoc
 */
ol.render.canvas.ImageReplay.prototype.drawMultiPointGeometry =
    function(multiPointGeometry, feature) {
  if (goog.isNull(this.image_)) {
    return;
  }
  goog.asserts.assert(goog.isDef(this.anchorX_));
  goog.asserts.assert(goog.isDef(this.anchorY_));
  goog.asserts.assert(goog.isDef(this.height_));
  goog.asserts.assert(goog.isDef(this.opacity_));
  goog.asserts.assert(goog.isDef(this.originX_));
  goog.asserts.assert(goog.isDef(this.originY_));
  goog.asserts.assert(goog.isDef(this.rotateWithView_));
  goog.asserts.assert(goog.isDef(this.rotation_));
  goog.asserts.assert(goog.isDef(this.scale_));
  goog.asserts.assert(goog.isDef(this.width_));
  this.beginGeometry(multiPointGeometry, feature);
  var flatCoordinates = multiPointGeometry.getFlatCoordinates();
  var stride = multiPointGeometry.getStride();
  var myBegin = this.coordinates.length;
  var myEnd = this.drawCoordinates_(
      flatCoordinates, 0, flatCoordinates.length, stride);
  this.instructions.push([
    ol.render.canvas.Instruction.DRAW_IMAGE, myBegin, myEnd, this.image_,
    // Remaining arguments to DRAW_IMAGE are in alphabetical order
    this.anchorX_, this.anchorY_, this.height_, this.opacity_,
    this.originX_, this.originY_, this.rotateWithView_, this.rotation_,
    this.scale_, this.snapToPixel_, this.width_
  ]);
  this.hitDetectionInstructions.push([
    ol.render.canvas.Instruction.DRAW_IMAGE, myBegin, myEnd,
    this.hitDetectionImage_,
    // Remaining arguments to DRAW_IMAGE are in alphabetical order
    this.anchorX_, this.anchorY_, this.height_, this.opacity_,
    this.originX_, this.originY_, this.rotateWithView_, this.rotation_,
    this.scale_, this.snapToPixel_, this.width_
  ]);
  this.endGeometry(multiPointGeometry, feature);
};


/**
 * @inheritDoc
 */
ol.render.canvas.ImageReplay.prototype.finish = function() {
  this.reverseHitDetectionInstructions_();
  // FIXME this doesn't really protect us against further calls to draw*Geometry
  this.anchorX_ = undefined;
  this.anchorY_ = undefined;
  this.hitDetectionImage_ = null;
  this.image_ = null;
  this.height_ = undefined;
  this.scale_ = undefined;
  this.opacity_ = undefined;
  this.originX_ = undefined;
  this.originY_ = undefined;
  this.rotateWithView_ = undefined;
  this.rotation_ = undefined;
  this.snapToPixel_ = undefined;
  this.width_ = undefined;
};


/**
 * @inheritDoc
 */
ol.render.canvas.ImageReplay.prototype.setImageStyle = function(imageStyle) {
  goog.asserts.assert(!goog.isNull(imageStyle));
  var anchor = imageStyle.getAnchor();
  goog.asserts.assert(!goog.isNull(anchor));
  var size = imageStyle.getSize();
  goog.asserts.assert(!goog.isNull(size));
  var hitDetectionImage = imageStyle.getHitDetectionImage(1);
  goog.asserts.assert(!goog.isNull(hitDetectionImage));
  var image = imageStyle.getImage(1);
  goog.asserts.assert(!goog.isNull(image));
  var origin = imageStyle.getOrigin();
  goog.asserts.assert(!goog.isNull(origin));
  this.anchorX_ = anchor[0];
  this.anchorY_ = anchor[1];
  this.hitDetectionImage_ = hitDetectionImage;
  this.image_ = image;
  this.height_ = size[1];
  this.opacity_ = imageStyle.getOpacity();
  this.originX_ = origin[0];
  this.originY_ = origin[1];
  this.rotateWithView_ = imageStyle.getRotateWithView();
  this.rotation_ = imageStyle.getRotation();
  this.scale_ = imageStyle.getScale();
  this.snapToPixel_ = imageStyle.getSnapToPixel();
  this.width_ = size[0];
};



/**
 * @constructor
 * @extends {ol.render.canvas.Replay}
 * @param {number} tolerance Tolerance.
 * @param {ol.Extent} maxExtent Maximum extent.
 * @param {number} resolution Resolution.
 * @protected
 * @struct
 */
ol.render.canvas.LineStringReplay = function(tolerance, maxExtent, resolution) {

  goog.base(this, tolerance, maxExtent, resolution);

  /**
   * @private
   * @type {{currentStrokeStyle: (string|undefined),
   *         currentLineCap: (string|undefined),
   *         currentLineDash: Array.<number>,
   *         currentLineJoin: (string|undefined),
   *         currentLineWidth: (number|undefined),
   *         currentMiterLimit: (number|undefined),
   *         lastStroke: number,
   *         strokeStyle: (string|undefined),
   *         lineCap: (string|undefined),
   *         lineDash: Array.<number>,
   *         lineJoin: (string|undefined),
   *         lineWidth: (number|undefined),
   *         miterLimit: (number|undefined)}|null}
   */
  this.state_ = {
    currentStrokeStyle: undefined,
    currentLineCap: undefined,
    currentLineDash: null,
    currentLineJoin: undefined,
    currentLineWidth: undefined,
    currentMiterLimit: undefined,
    lastStroke: 0,
    strokeStyle: undefined,
    lineCap: undefined,
    lineDash: null,
    lineJoin: undefined,
    lineWidth: undefined,
    miterLimit: undefined
  };

};
goog.inherits(ol.render.canvas.LineStringReplay, ol.render.canvas.Replay);


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @private
 * @return {number} end.
 */
ol.render.canvas.LineStringReplay.prototype.drawFlatCoordinates_ =
    function(flatCoordinates, offset, end, stride) {
  var myBegin = this.coordinates.length;
  var myEnd = this.appendFlatCoordinates(
      flatCoordinates, offset, end, stride, false);
  var moveToLineToInstruction =
      [ol.render.canvas.Instruction.MOVE_TO_LINE_TO, myBegin, myEnd];
  this.instructions.push(moveToLineToInstruction);
  this.hitDetectionInstructions.push(moveToLineToInstruction);
  return end;
};


/**
 * @inheritDoc
 */
ol.render.canvas.LineStringReplay.prototype.getBufferedMaxExtent = function() {
  var extent = this.maxExtent;
  if (this.maxLineWidth) {
    extent = ol.extent.buffer(
        extent, this.resolution * (this.maxLineWidth + 1) / 2);
  }
  return extent;
};


/**
 * @private
 */
ol.render.canvas.LineStringReplay.prototype.setStrokeStyle_ = function() {
  var state = this.state_;
  var strokeStyle = state.strokeStyle;
  var lineCap = state.lineCap;
  var lineDash = state.lineDash;
  var lineJoin = state.lineJoin;
  var lineWidth = state.lineWidth;
  var miterLimit = state.miterLimit;
  goog.asserts.assert(goog.isDef(strokeStyle));
  goog.asserts.assert(goog.isDef(lineCap));
  goog.asserts.assert(!goog.isNull(lineDash));
  goog.asserts.assert(goog.isDef(lineJoin));
  goog.asserts.assert(goog.isDef(lineWidth));
  goog.asserts.assert(goog.isDef(miterLimit));
  if (state.currentStrokeStyle != strokeStyle ||
      state.currentLineCap != lineCap ||
      !goog.array.equals(state.currentLineDash, lineDash) ||
      state.currentLineJoin != lineJoin ||
      state.currentLineWidth != lineWidth ||
      state.currentMiterLimit != miterLimit) {
    if (state.lastStroke != this.coordinates.length) {
      this.instructions.push(
          [ol.render.canvas.Instruction.STROKE]);
      state.lastStroke = this.coordinates.length;
    }
    this.instructions.push(
        [ol.render.canvas.Instruction.SET_STROKE_STYLE,
         strokeStyle, lineWidth, lineCap, lineJoin, miterLimit, lineDash],
        [ol.render.canvas.Instruction.BEGIN_PATH]);
    state.currentStrokeStyle = strokeStyle;
    state.currentLineCap = lineCap;
    state.currentLineDash = lineDash;
    state.currentLineJoin = lineJoin;
    state.currentLineWidth = lineWidth;
    state.currentMiterLimit = miterLimit;
  }
};


/**
 * @inheritDoc
 */
ol.render.canvas.LineStringReplay.prototype.drawLineStringGeometry =
    function(lineStringGeometry, feature) {
  var state = this.state_;
  goog.asserts.assert(!goog.isNull(state));
  var strokeStyle = state.strokeStyle;
  var lineWidth = state.lineWidth;
  if (!goog.isDef(strokeStyle) || !goog.isDef(lineWidth)) {
    return;
  }
  this.setStrokeStyle_();
  this.beginGeometry(lineStringGeometry, feature);
  this.hitDetectionInstructions.push(
      [ol.render.canvas.Instruction.SET_STROKE_STYLE,
       state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,
       state.miterLimit, state.lineDash],
      [ol.render.canvas.Instruction.BEGIN_PATH]);
  var flatCoordinates = lineStringGeometry.getFlatCoordinates();
  var stride = lineStringGeometry.getStride();
  this.drawFlatCoordinates_(
      flatCoordinates, 0, flatCoordinates.length, stride);
  this.hitDetectionInstructions.push([ol.render.canvas.Instruction.STROKE]);
  this.endGeometry(lineStringGeometry, feature);
};


/**
 * @inheritDoc
 */
ol.render.canvas.LineStringReplay.prototype.drawMultiLineStringGeometry =
    function(multiLineStringGeometry, feature) {
  var state = this.state_;
  goog.asserts.assert(!goog.isNull(state));
  var strokeStyle = state.strokeStyle;
  var lineWidth = state.lineWidth;
  if (!goog.isDef(strokeStyle) || !goog.isDef(lineWidth)) {
    return;
  }
  this.setStrokeStyle_();
  this.beginGeometry(multiLineStringGeometry, feature);
  this.hitDetectionInstructions.push(
      [ol.render.canvas.Instruction.SET_STROKE_STYLE,
       state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,
       state.miterLimit, state.lineDash],
      [ol.render.canvas.Instruction.BEGIN_PATH]);
  var ends = multiLineStringGeometry.getEnds();
  var flatCoordinates = multiLineStringGeometry.getFlatCoordinates();
  var stride = multiLineStringGeometry.getStride();
  var offset = 0;
  var i, ii;
  for (i = 0, ii = ends.length; i < ii; ++i) {
    offset = this.drawFlatCoordinates_(
        flatCoordinates, offset, ends[i], stride);
  }
  this.hitDetectionInstructions.push([ol.render.canvas.Instruction.STROKE]);
  this.endGeometry(multiLineStringGeometry, feature);
};


/**
 * @inheritDoc
 */
ol.render.canvas.LineStringReplay.prototype.finish = function() {
  var state = this.state_;
  goog.asserts.assert(!goog.isNull(state));
  if (state.lastStroke != this.coordinates.length) {
    this.instructions.push([ol.render.canvas.Instruction.STROKE]);
  }
  this.reverseHitDetectionInstructions_();
  this.state_ = null;
};


/**
 * @inheritDoc
 */
ol.render.canvas.LineStringReplay.prototype.setFillStrokeStyle =
    function(fillStyle, strokeStyle) {
  goog.asserts.assert(!goog.isNull(this.state_));
  goog.asserts.assert(goog.isNull(fillStyle));
  goog.asserts.assert(!goog.isNull(strokeStyle));
  var strokeStyleColor = strokeStyle.getColor();
  this.state_.strokeStyle = ol.color.asString(!goog.isNull(strokeStyleColor) ?
      strokeStyleColor : ol.render.canvas.defaultStrokeStyle);
  var strokeStyleLineCap = strokeStyle.getLineCap();
  this.state_.lineCap = goog.isDef(strokeStyleLineCap) ?
      strokeStyleLineCap : ol.render.canvas.defaultLineCap;
  var strokeStyleLineDash = strokeStyle.getLineDash();
  this.state_.lineDash = !goog.isNull(strokeStyleLineDash) ?
      strokeStyleLineDash : ol.render.canvas.defaultLineDash;
  var strokeStyleLineJoin = strokeStyle.getLineJoin();
  this.state_.lineJoin = goog.isDef(strokeStyleLineJoin) ?
      strokeStyleLineJoin : ol.render.canvas.defaultLineJoin;
  var strokeStyleWidth = strokeStyle.getWidth();
  this.state_.lineWidth = goog.isDef(strokeStyleWidth) ?
      strokeStyleWidth : ol.render.canvas.defaultLineWidth;
  var strokeStyleMiterLimit = strokeStyle.getMiterLimit();
  this.state_.miterLimit = goog.isDef(strokeStyleMiterLimit) ?
      strokeStyleMiterLimit : ol.render.canvas.defaultMiterLimit;
  this.maxLineWidth = Math.max(this.maxLineWidth, this.state_.lineWidth);
};



/**
 * @constructor
 * @extends {ol.render.canvas.Replay}
 * @param {number} tolerance Tolerance.
 * @param {ol.Extent} maxExtent Maximum extent.
 * @param {number} resolution Resolution.
 * @protected
 * @struct
 */
ol.render.canvas.PolygonReplay = function(tolerance, maxExtent, resolution) {

  goog.base(this, tolerance, maxExtent, resolution);

  /**
   * @private
   * @type {{currentFillStyle: (string|undefined),
   *         currentStrokeStyle: (string|undefined),
   *         currentLineCap: (string|undefined),
   *         currentLineDash: Array.<number>,
   *         currentLineJoin: (string|undefined),
   *         currentLineWidth: (number|undefined),
   *         currentMiterLimit: (number|undefined),
   *         fillStyle: (string|undefined),
   *         strokeStyle: (string|undefined),
   *         lineCap: (string|undefined),
   *         lineDash: Array.<number>,
   *         lineJoin: (string|undefined),
   *         lineWidth: (number|undefined),
   *         miterLimit: (number|undefined)}|null}
   */
  this.state_ = {
    currentFillStyle: undefined,
    currentStrokeStyle: undefined,
    currentLineCap: undefined,
    currentLineDash: null,
    currentLineJoin: undefined,
    currentLineWidth: undefined,
    currentMiterLimit: undefined,
    fillStyle: undefined,
    strokeStyle: undefined,
    lineCap: undefined,
    lineDash: null,
    lineJoin: undefined,
    lineWidth: undefined,
    miterLimit: undefined
  };

};
goog.inherits(ol.render.canvas.PolygonReplay, ol.render.canvas.Replay);


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<number>} ends Ends.
 * @param {number} stride Stride.
 * @private
 * @return {number} End.
 */
ol.render.canvas.PolygonReplay.prototype.drawFlatCoordinatess_ =
    function(flatCoordinates, offset, ends, stride) {
  var state = this.state_;
  var beginPathInstruction = [ol.render.canvas.Instruction.BEGIN_PATH];
  this.instructions.push(beginPathInstruction);
  this.hitDetectionInstructions.push(beginPathInstruction);
  var i, ii;
  for (i = 0, ii = ends.length; i < ii; ++i) {
    var end = ends[i];
    var myBegin = this.coordinates.length;
    var myEnd = this.appendFlatCoordinates(
        flatCoordinates, offset, end, stride, true);
    var moveToLineToInstruction =
        [ol.render.canvas.Instruction.MOVE_TO_LINE_TO, myBegin, myEnd];
    var closePathInstruction = [ol.render.canvas.Instruction.CLOSE_PATH];
    this.instructions.push(moveToLineToInstruction, closePathInstruction);
    this.hitDetectionInstructions.push(moveToLineToInstruction,
        closePathInstruction);
    offset = end;
  }
  // FIXME is it quicker to fill and stroke each polygon individually,
  // FIXME or all polygons together?
  var fillInstruction = [ol.render.canvas.Instruction.FILL];
  this.hitDetectionInstructions.push(fillInstruction);
  if (goog.isDef(state.fillStyle)) {
    this.instructions.push(fillInstruction);
  }
  if (goog.isDef(state.strokeStyle)) {
    goog.asserts.assert(goog.isDef(state.lineWidth));
    var strokeInstruction = [ol.render.canvas.Instruction.STROKE];
    this.instructions.push(strokeInstruction);
    this.hitDetectionInstructions.push(strokeInstruction);
  }
  return offset;
};


/**
 * @inheritDoc
 */
ol.render.canvas.PolygonReplay.prototype.drawCircleGeometry =
    function(circleGeometry, feature) {
  var state = this.state_;
  goog.asserts.assert(!goog.isNull(state));
  var fillStyle = state.fillStyle;
  var strokeStyle = state.strokeStyle;
  if (!goog.isDef(fillStyle) && !goog.isDef(strokeStyle)) {
    return;
  }
  if (goog.isDef(strokeStyle)) {
    goog.asserts.assert(goog.isDef(state.lineWidth));
  }
  this.setFillStrokeStyles_();
  this.beginGeometry(circleGeometry, feature);
  // always fill the circle for hit detection
  this.hitDetectionInstructions.push(
      [ol.render.canvas.Instruction.SET_FILL_STYLE,
       ol.color.asString(ol.render.canvas.defaultFillStyle)]);
  if (goog.isDef(state.strokeStyle)) {
    this.hitDetectionInstructions.push(
        [ol.render.canvas.Instruction.SET_STROKE_STYLE,
         state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,
         state.miterLimit, state.lineDash]);
  }
  var flatCoordinates = circleGeometry.getFlatCoordinates();
  var stride = circleGeometry.getStride();
  var myBegin = this.coordinates.length;
  this.appendFlatCoordinates(
      flatCoordinates, 0, flatCoordinates.length, stride, false);
  var beginPathInstruction = [ol.render.canvas.Instruction.BEGIN_PATH];
  var circleInstruction = [ol.render.canvas.Instruction.CIRCLE, myBegin];
  this.instructions.push(beginPathInstruction, circleInstruction);
  this.hitDetectionInstructions.push(beginPathInstruction, circleInstruction);
  var fillInstruction = [ol.render.canvas.Instruction.FILL];
  this.hitDetectionInstructions.push(fillInstruction);
  if (goog.isDef(state.fillStyle)) {
    this.instructions.push(fillInstruction);
  }
  if (goog.isDef(state.strokeStyle)) {
    goog.asserts.assert(goog.isDef(state.lineWidth));
    var strokeInstruction = [ol.render.canvas.Instruction.STROKE];
    this.instructions.push(strokeInstruction);
    this.hitDetectionInstructions.push(strokeInstruction);
  }
  this.endGeometry(circleGeometry, feature);
};


/**
 * @inheritDoc
 */
ol.render.canvas.PolygonReplay.prototype.drawPolygonGeometry =
    function(polygonGeometry, feature) {
  var state = this.state_;
  goog.asserts.assert(!goog.isNull(state));
  var fillStyle = state.fillStyle;
  var strokeStyle = state.strokeStyle;
  if (!goog.isDef(fillStyle) && !goog.isDef(strokeStyle)) {
    return;
  }
  if (goog.isDef(strokeStyle)) {
    goog.asserts.assert(goog.isDef(state.lineWidth));
  }
  this.setFillStrokeStyles_();
  this.beginGeometry(polygonGeometry, feature);
  // always fill the polygon for hit detection
  this.hitDetectionInstructions.push(
      [ol.render.canvas.Instruction.SET_FILL_STYLE,
       ol.color.asString(ol.render.canvas.defaultFillStyle)]);
  if (goog.isDef(state.strokeStyle)) {
    this.hitDetectionInstructions.push(
        [ol.render.canvas.Instruction.SET_STROKE_STYLE,
         state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,
         state.miterLimit, state.lineDash]);
  }
  var ends = polygonGeometry.getEnds();
  var flatCoordinates = polygonGeometry.getOrientedFlatCoordinates();
  var stride = polygonGeometry.getStride();
  this.drawFlatCoordinatess_(flatCoordinates, 0, ends, stride);
  this.endGeometry(polygonGeometry, feature);
};


/**
 * @inheritDoc
 */
ol.render.canvas.PolygonReplay.prototype.drawMultiPolygonGeometry =
    function(multiPolygonGeometry, feature) {
  var state = this.state_;
  goog.asserts.assert(!goog.isNull(state));
  var fillStyle = state.fillStyle;
  var strokeStyle = state.strokeStyle;
  if (!goog.isDef(fillStyle) && !goog.isDef(strokeStyle)) {
    return;
  }
  if (goog.isDef(strokeStyle)) {
    goog.asserts.assert(goog.isDef(state.lineWidth));
  }
  this.setFillStrokeStyles_();
  this.beginGeometry(multiPolygonGeometry, feature);
  // always fill the multi-polygon for hit detection
  this.hitDetectionInstructions.push(
      [ol.render.canvas.Instruction.SET_FILL_STYLE,
       ol.color.asString(ol.render.canvas.defaultFillStyle)]);
  if (goog.isDef(state.strokeStyle)) {
    this.hitDetectionInstructions.push(
        [ol.render.canvas.Instruction.SET_STROKE_STYLE,
         state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,
         state.miterLimit, state.lineDash]);
  }
  var endss = multiPolygonGeometry.getEndss();
  var flatCoordinates = multiPolygonGeometry.getOrientedFlatCoordinates();
  var stride = multiPolygonGeometry.getStride();
  var offset = 0;
  var i, ii;
  for (i = 0, ii = endss.length; i < ii; ++i) {
    offset = this.drawFlatCoordinatess_(
        flatCoordinates, offset, endss[i], stride);
  }
  this.endGeometry(multiPolygonGeometry, feature);
};


/**
 * @inheritDoc
 */
ol.render.canvas.PolygonReplay.prototype.finish = function() {
  goog.asserts.assert(!goog.isNull(this.state_));
  this.reverseHitDetectionInstructions_();
  this.state_ = null;
  // We want to preserve topology when drawing polygons.  Polygons are
  // simplified using quantization and point elimination. However, we might
  // have received a mix of quantized and non-quantized geometries, so ensure
  // that all are quantized by quantizing all coordinates in the batch.
  var tolerance = this.tolerance;
  if (tolerance !== 0) {
    var coordinates = this.coordinates;
    var i, ii;
    for (i = 0, ii = coordinates.length; i < ii; ++i) {
      coordinates[i] = ol.geom.flat.simplify.snap(coordinates[i], tolerance);
    }
  }
};


/**
 * @inheritDoc
 */
ol.render.canvas.PolygonReplay.prototype.getBufferedMaxExtent = function() {
  var extent = this.maxExtent;
  if (this.maxLineWidth) {
    extent = ol.extent.buffer(
        extent, this.resolution * (this.maxLineWidth + 1) / 2);
  }
  return extent;
};


/**
 * @inheritDoc
 */
ol.render.canvas.PolygonReplay.prototype.setFillStrokeStyle =
    function(fillStyle, strokeStyle) {
  goog.asserts.assert(!goog.isNull(this.state_));
  goog.asserts.assert(!goog.isNull(fillStyle) || !goog.isNull(strokeStyle));
  var state = this.state_;
  if (!goog.isNull(fillStyle)) {
    var fillStyleColor = fillStyle.getColor();
    state.fillStyle = ol.color.asString(!goog.isNull(fillStyleColor) ?
        fillStyleColor : ol.render.canvas.defaultFillStyle);
  } else {
    state.fillStyle = undefined;
  }
  if (!goog.isNull(strokeStyle)) {
    var strokeStyleColor = strokeStyle.getColor();
    state.strokeStyle = ol.color.asString(!goog.isNull(strokeStyleColor) ?
        strokeStyleColor : ol.render.canvas.defaultStrokeStyle);
    var strokeStyleLineCap = strokeStyle.getLineCap();
    state.lineCap = goog.isDef(strokeStyleLineCap) ?
        strokeStyleLineCap : ol.render.canvas.defaultLineCap;
    var strokeStyleLineDash = strokeStyle.getLineDash();
    state.lineDash = !goog.isNull(strokeStyleLineDash) ?
        strokeStyleLineDash.slice() : ol.render.canvas.defaultLineDash;
    var strokeStyleLineJoin = strokeStyle.getLineJoin();
    state.lineJoin = goog.isDef(strokeStyleLineJoin) ?
        strokeStyleLineJoin : ol.render.canvas.defaultLineJoin;
    var strokeStyleWidth = strokeStyle.getWidth();
    state.lineWidth = goog.isDef(strokeStyleWidth) ?
        strokeStyleWidth : ol.render.canvas.defaultLineWidth;
    var strokeStyleMiterLimit = strokeStyle.getMiterLimit();
    state.miterLimit = goog.isDef(strokeStyleMiterLimit) ?
        strokeStyleMiterLimit : ol.render.canvas.defaultMiterLimit;
    this.maxLineWidth = Math.max(this.maxLineWidth, state.lineWidth);
  } else {
    state.strokeStyle = undefined;
    state.lineCap = undefined;
    state.lineDash = null;
    state.lineJoin = undefined;
    state.lineWidth = undefined;
    state.miterLimit = undefined;
  }
};


/**
 * @private
 */
ol.render.canvas.PolygonReplay.prototype.setFillStrokeStyles_ = function() {
  var state = this.state_;
  var fillStyle = state.fillStyle;
  var strokeStyle = state.strokeStyle;
  var lineCap = state.lineCap;
  var lineDash = state.lineDash;
  var lineJoin = state.lineJoin;
  var lineWidth = state.lineWidth;
  var miterLimit = state.miterLimit;
  if (goog.isDef(fillStyle) && state.currentFillStyle != fillStyle) {
    this.instructions.push(
        [ol.render.canvas.Instruction.SET_FILL_STYLE, fillStyle]);
    state.currentFillStyle = state.fillStyle;
  }
  if (goog.isDef(strokeStyle)) {
    goog.asserts.assert(goog.isDef(lineCap));
    goog.asserts.assert(!goog.isNull(lineDash));
    goog.asserts.assert(goog.isDef(lineJoin));
    goog.asserts.assert(goog.isDef(lineWidth));
    goog.asserts.assert(goog.isDef(miterLimit));
    if (state.currentStrokeStyle != strokeStyle ||
        state.currentLineCap != lineCap ||
        state.currentLineDash != lineDash ||
        state.currentLineJoin != lineJoin ||
        state.currentLineWidth != lineWidth ||
        state.currentMiterLimit != miterLimit) {
      this.instructions.push(
          [ol.render.canvas.Instruction.SET_STROKE_STYLE,
           strokeStyle, lineWidth, lineCap, lineJoin, miterLimit, lineDash]);
      state.currentStrokeStyle = strokeStyle;
      state.currentLineCap = lineCap;
      state.currentLineDash = lineDash;
      state.currentLineJoin = lineJoin;
      state.currentLineWidth = lineWidth;
      state.currentMiterLimit = miterLimit;
    }
  }
};



/**
 * @constructor
 * @extends {ol.render.canvas.Replay}
 * @param {number} tolerance Tolerance.
 * @param {ol.Extent} maxExtent Maximum extent.
 * @param {number} resolution Resolution.
 * @protected
 * @struct
 */
ol.render.canvas.TextReplay = function(tolerance, maxExtent, resolution) {

  goog.base(this, tolerance, maxExtent, resolution);

  /**
   * @private
   * @type {?ol.render.canvas.FillState}
   */
  this.replayFillState_ = null;

  /**
   * @private
   * @type {?ol.render.canvas.StrokeState}
   */
  this.replayStrokeState_ = null;

  /**
   * @private
   * @type {?ol.render.canvas.TextState}
   */
  this.replayTextState_ = null;

  /**
   * @private
   * @type {string}
   */
  this.text_ = '';

  /**
   * @private
   * @type {number}
   */
  this.textOffsetX_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.textOffsetY_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.textRotation_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.textScale_ = 0;

  /**
   * @private
   * @type {?ol.render.canvas.FillState}
   */
  this.textFillState_ = null;

  /**
   * @private
   * @type {?ol.render.canvas.StrokeState}
   */
  this.textStrokeState_ = null;

  /**
   * @private
   * @type {?ol.render.canvas.TextState}
   */
  this.textState_ = null;

};
goog.inherits(ol.render.canvas.TextReplay, ol.render.canvas.Replay);


/**
 * @inheritDoc
 */
ol.render.canvas.TextReplay.prototype.drawText =
    function(flatCoordinates, offset, end, stride, geometry, feature) {
  if (this.text_ === '' ||
      goog.isNull(this.textState_) ||
      (goog.isNull(this.textFillState_) &&
       goog.isNull(this.textStrokeState_))) {
    return;
  }
  if (!goog.isNull(this.textFillState_)) {
    this.setReplayFillState_(this.textFillState_);
  }
  if (!goog.isNull(this.textStrokeState_)) {
    this.setReplayStrokeState_(this.textStrokeState_);
  }
  this.setReplayTextState_(this.textState_);
  this.beginGeometry(geometry, feature);
  var myBegin = this.coordinates.length;
  var myEnd =
      this.appendFlatCoordinates(flatCoordinates, offset, end, stride, false);
  var fill = !goog.isNull(this.textFillState_);
  var stroke = !goog.isNull(this.textStrokeState_);
  var drawTextInstruction = [
    ol.render.canvas.Instruction.DRAW_TEXT, myBegin, myEnd, this.text_,
    this.textOffsetX_, this.textOffsetY_, this.textRota