lottie-web/player/js/utils/shapes/GradientProperty.js

After Effects plugin for exporting animations to SVG + JavaScript or canvas + JavaScript

import {
  extendPrototype,
} from '../functionExtensions';
import DynamicPropertyContainer from '../helpers/dynamicProperties';
import {
  createTypedArray,
} from '../helpers/arrays';
import PropertyFactory from '../PropertyFactory';

function GradientProperty(elem, data, container) {
  this.data = data;
  this.c = createTypedArray('uint8c', data.p * 4);
  var cLength = data.k.k[0].s ? (data.k.k[0].s.length - data.p * 4) : data.k.k.length - data.p * 4;
  this.o = createTypedArray('float32', cLength);
  this._cmdf = false;
  this._omdf = false;
  this._collapsable = this.checkCollapsable();
  this._hasOpacity = cLength;
  this.initDynamicPropertyContainer(container);
  this.prop = PropertyFactory.getProp(elem, data.k, 1, null, this);
  this.k = this.prop.k;
  this.getValue(true);
}

GradientProperty.prototype.comparePoints = function (values, points) {
  var i = 0;
  var len = this.o.length / 2;
  var diff;
  while (i < len) {
    diff = Math.abs(values[i * 4] - values[points * 4 + i * 2]);
    if (diff > 0.01) {
      return false;
    }
    i += 1;
  }
  return true;
};

GradientProperty.prototype.checkCollapsable = function () {
  if (this.o.length / 2 !== this.c.length / 4) {
    return false;
  }
  if (this.data.k.k[0].s) {
    var i = 0;
    var len = this.data.k.k.length;
    while (i < len) {
      if (!this.comparePoints(this.data.k.k[i].s, this.data.p)) {
        return false;
      }
      i += 1;
    }
  } else if (!this.comparePoints(this.data.k.k, this.data.p)) {
    return false;
  }
  return true;
};

GradientProperty.prototype.getValue = function (forceRender) {
  this.prop.getValue();
  this._mdf = false;
  this._cmdf = false;
  this._omdf = false;
  if (this.prop._mdf || forceRender) {
    var i;
    var len = this.data.p * 4;
    var mult;
    var val;
    for (i = 0; i < len; i += 1) {
      mult = i % 4 === 0 ? 100 : 255;
      val = Math.round(this.prop.v[i] * mult);
      if (this.c[i] !== val) {
        this.c[i] = val;
        this._cmdf = !forceRender;
      }
    }
    if (this.o.length) {
      len = this.prop.v.length;
      for (i = this.data.p * 4; i < len; i += 1) {
        mult = i % 2 === 0 ? 100 : 1;
        val = i % 2 === 0 ? Math.round(this.prop.v[i] * 100) : this.prop.v[i];
        if (this.o[i - this.data.p * 4] !== val) {
          this.o[i - this.data.p * 4] = val;
          this._omdf = !forceRender;
        }
      }
    }
    this._mdf = !forceRender;
  }
};

extendPrototype([DynamicPropertyContainer], GradientProperty);

export default GradientProperty;