Function createOrUpdatePatternFromDecal

_benchmarks/sample_echarts.js:27143–27390

* Create or update pattern image from decal options * * @param {InnerDecalObject | 'none'} decalObject decal options, 'none' if no decal * @return {Pattern} pattern with generated image, null if no decal

(decalObject, api)

     */

    function createOrUpdatePatternFromDecal(decalObject, api) {
      if (decalObject === 'none') {
        return null;
      }

      var dpr = api.getDevicePixelRatio();
      var zr = api.getZr();
      var isSVG = zr.painter.type === 'svg';

      if (decalObject.dirty) {
        decalMap["delete"](decalObject);
      }

      var oldPattern = decalMap.get(decalObject);

      if (oldPattern) {
        return oldPattern;
      }

      var decalOpt = defaults(decalObject, {
        symbol: 'rect',
        symbolSize: 1,
        symbolKeepAspect: true,
        color: 'rgba(0, 0, 0, 0.2)',
        backgroundColor: null,
        dashArrayX: 5,
        dashArrayY: 5,
        rotation: 0,
        maxTileWidth: 512,
        maxTileHeight: 512
      });

      if (decalOpt.backgroundColor === 'none') {
        decalOpt.backgroundColor = null;
      }

      var pattern = {
        repeat: 'repeat'
      };
      setPatternnSource(pattern);
      pattern.rotation = decalOpt.rotation;
      pattern.scaleX = pattern.scaleY = isSVG ? 1 : 1 / dpr;
      decalMap.set(decalObject, pattern);
      decalObject.dirty = false;
      return pattern;

      function setPatternnSource(pattern) {
        var keys = [dpr];
        var isValidKey = true;

        for (var i = 0; i < decalKeys.length; ++i) {
          var value = decalOpt[decalKeys[i]];
          var valueType = typeof value;

          if (value != null && !isArray(value) && valueType !== 'string' && valueType !== 'number' && valueType !== 'boolean') {
            isValidKey = false;
            break;
          }