player/js/elements/htmlElements/HShapeElement.js

function HShapeElement(data,globalData,comp){
    //List of drawable elements
    this.shapes = [];
    // Full shape data
    this.shapesData = data.shapes;
    //List of styles that will be applied to shapes
    this.stylesList = [];
    //List of modifiers that will be applied to shapes
    this.shapeModifiers = [];
    //List of items in shape tree
    this.itemsData = [];
    //List of items in previous shape tree
    this.processedElements = [];
    this.shapesContainer = createNS('g');
    this.initElement(data,globalData,comp);
    //Moving any property that doesn't get too much access after initialization because of v8 way of handling more than 10 properties.
    // List of elements that have been created
    this.prevViewData = [];
    this.currentBBox = {
        x:999999,
        y: -999999,
        h: 0,
        w: 0
    };
}
extendPrototype([BaseElement,TransformElement,HSolidElement,SVGShapeElement,HBaseElement,HierarchyElement,FrameElement,RenderableElement], HShapeElement);
HShapeElement.prototype._renderShapeFrame = HShapeElement.prototype.renderInnerContent;

HShapeElement.prototype.createContent = function(){
    var cont;
    if (this.data.hasMask) {
        this.layerElement.appendChild(this.shapesContainer);
        cont = this.svgElement;
    } else {
        cont = createNS('svg');
        var size = this.comp.data ? this.comp.data : this.globalData.compSize;
        cont.setAttribute('width',size.w);
        cont.setAttribute('height',size.h);
        cont.appendChild(this.shapesContainer);
        this.layerElement.appendChild(cont);
    }

    this.searchShapes(this.shapesData,this.itemsData,this.prevViewData,this.shapesContainer,0, [], true);
    this.shapeCont = cont;
};

HShapeElement.prototype.getTransformedPoint = function(transformers, point) {
    var i, len = transformers.length;
    for(i = 0; i < len; i += 1) {
        point = transformers[i].mProps.v.applyToPointArray(point[0], point[1], 0);
    }
    return point;
}

HShapeElement.prototype.calculateShapeBoundingBox = function(item, boundingBox) {
    var shape = item.sh.v;
    var transformers = item.transformers;
    var i, len = shape._length, vPoint, oPoint, nextIPoint, nextVPoint, bounds;
    if (len <= 1) {
        return;
    }
    for (i = 0; i < len - 1; i += 1) {
        vPoint = this.getTransformedPoint(transformers, shape.v[i]);
        oPoint = this.getTransformedPoint(transformers, shape.o[i]);
        nextIPoint = this.getTransformedPoint(transformers, shape.i[i + 1]);
        nextVPoint = this.getTransformedPoint(transformers, shape.v[i + 1]);
        this.checkBounds(vPoint, oPoint, nextIPoint, nextVPoint, boundingBox);
    }
    if(shape.c) {
        vPoint = this.getTransformedPoint(transformers, shape.v[i]);
        oPoint = this.getTransformedPoint(transformers, shape.o[i]);
        nextIPoint = this.getTransformedPoint(transformers, shape.i[0]);
        nextVPoint = this.getTransformedPoint(transformers, shape.v[0]);
        this.checkBounds(vPoint, oPoint, nextIPoint, nextVPoint, boundingBox);
    }
}

HShapeElement.prototype.checkBounds = function(vPoint, oPoint, nextIPoint, nextVPoint, boundingBox) {
    this.getBoundsOfCurve(vPoint, oPoint, nextIPoint, nextVPoint);
    var bounds = this.shapeBoundingBox;
    boundingBox.x = bm_min(bounds.left, boundingBox.x);
    boundingBox.xMax = bm_max(bounds.right, boundingBox.xMax);
    boundingBox.y = bm_min(bounds.top, boundingBox.y);
    boundingBox.yMax = bm_max(bounds.bottom, boundingBox.yMax);
}

HShapeElement.prototype.shapeBoundingBox = {
    left:0,
    right:0,
    top:0,
    bottom:0,
}

HShapeElement.prototype.tempBoundingBox = {
    x:0,
    xMax:0,
    y:0,
    yMax:0,
    width:0,
    height:0
}

HShapeElement.prototype.getBoundsOfCurve = function(p0, p1, p2, p3) {

    var bounds = [[p0[0],p3[0]], [p0[1],p3[1]]];

    for (var a, b, c, t, b2ac, t1, t2, i = 0; i < 2; ++i) {

      b = 6 * p0[i] - 12 * p1[i] + 6 * p2[i];
      a = -3 * p0[i] + 9 * p1[i] - 9 * p2[i] + 3 * p3[i];
      c = 3 * p1[i] - 3 * p0[i];

      b = b | 0;
      a = a | 0;
      c = c | 0;

      if (a === 0) {

        if (b === 0) {
          continue;
        }

        t = -c / b;

        if (0 < t && t < 1) {
          bounds[i].push(this.calculateF(t,p0,p1,p2,p3,i));
        }
        continue;
      }

      b2ac = b * b - 4 * c * a;

      if (b2ac < 0) {
        continue;
      }

      t1 = (-b + bm_sqrt(b2ac))/(2 * a);
      if (0 < t1 && t1 < 1) bounds[i].push(this.calculateF(t1,p0,p1,p2,p3,i));

      t2 = (-b - bm_sqrt(b2ac))/(2 * a);
      if (0 < t2 && t2 < 1) bounds[i].push(this.calculateF(t2,p0,p1,p2,p3,i));

    }

    this.shapeBoundingBox.left = bm_min.apply(null, bounds[0]);
    this.shapeBoundingBox.top = bm_min.apply(null, bounds[1]);
    this.shapeBoundingBox.right = bm_max.apply(null, bounds[0]);
    this.shapeBoundingBox.bottom = bm_max.apply(null, bounds[1]);
  };

  HShapeElement.prototype.calculateF = function(t, p0, p1, p2, p3, i) {
    return bm_pow(1-t, 3) * p0[i]
        + 3 * bm_pow(1-t, 2) * t * p1[i]
        + 3 * (1-t) * bm_pow(t, 2) * p2[i]
        + bm_pow(t, 3) * p3[i];
  }

HShapeElement.prototype.calculateBoundingBox = function(itemsData, boundingBox) {
    var i, len = itemsData.length, path;
    for(i = 0; i < len; i += 1) {
        if(itemsData[i] && itemsData[i].sh) {
            this.calculateShapeBoundingBox(itemsData[i], boundingBox)
        } else if(itemsData[i] && itemsData[i].it) {
            this.calculateBoundingBox(itemsData[i].it, boundingBox)
        }
    }
}

HShapeElement.prototype.renderInnerContent = function() {
    this._renderShapeFrame();

    if(!this.hidden && (this._isFirstFrame || this._mdf)) {
        var tempBoundingBox = this.tempBoundingBox;
        var max = 999999;
        tempBoundingBox.x = max;
        tempBoundingBox.xMax = -max;
        tempBoundingBox.y = max;
        tempBoundingBox.yMax = -max;
        this.calculateBoundingBox(this.itemsData, tempBoundingBox);
        tempBoundingBox.width = tempBoundingBox.xMax < tempBoundingBox.x ? 0 : tempBoundingBox.xMax - tempBoundingBox.x;
        tempBoundingBox.height = tempBoundingBox.yMax < tempBoundingBox.y ? 0 : tempBoundingBox.yMax - tempBoundingBox.y;
        //var tempBoundingBox = this.shapeCont.getBBox();
        var changed = false;
        if(this.currentBBox.w !== tempBoundingBox.width){
            this.currentBBox.w = tempBoundingBox.width;
            this.shapeCont.setAttribute('width',tempBoundingBox.width);
            changed = true;
        }
        if(this.currentBBox.h !== tempBoundingBox.height){
            this.currentBBox.h = tempBoundingBox.height;
            this.shapeCont.setAttribute('height',tempBoundingBox.height);
            changed = true;
        }
        if(changed  || this.currentBBox.x !== tempBoundingBox.x  || this.currentBBox.y !== tempBoundingBox.y){
            this.currentBBox.w = tempBoundingBox.width;
            this.currentBBox.h = tempBoundingBox.height;
            this.currentBBox.x = tempBoundingBox.x;
            this.currentBBox.y = tempBoundingBox.y;

            this.shapeCont.setAttribute('viewBox',this.currentBBox.x+' '+this.currentBBox.y+' '+this.currentBBox.w+' '+this.currentBBox.h);
            this.shapeCont.style.transform = this.shapeCont.style.webkitTransform = 'translate(' + this.currentBBox.x + 'px,' + this.currentBBox.y + 'px)';
        }
    }

};