async setGState()

in src/core/evaluator.js [1065:1182]
110 lines of code
34 McCabe index (conditional complexity)

  async setGState({
    resources,
    gState,
    operatorList,
    cacheKey,
    task,
    stateManager,
    localGStateCache,
    localColorSpaceCache,
    seenRefs,
  }) {
    const gStateRef = gState.objId;
    let isSimpleGState = true;
    // This array holds the converted/processed state data.
    const gStateObj = [];
    let promise = Promise.resolve();
    for (const [key, value] of gState) {
      switch (key) {
        case "Type":
          break;
        case "LW":
          if (typeof value !== "number") {
            warn(`Invalid LW (line width): ${value}`);
            break;
          }
          gStateObj.push([key, Math.abs(value)]);
          break;
        case "LC":
        case "LJ":
        case "ML":
        case "D":
        case "RI":
        case "FL":
        case "CA":
        case "ca":
          gStateObj.push([key, value]);
          break;
        case "Font":
          isSimpleGState = false;

          promise = promise.then(() =>
            this.handleSetFont(
              resources,
              null,
              value[0],
              operatorList,
              task,
              stateManager.state
            ).then(function (loadedName) {
              operatorList.addDependency(loadedName);
              gStateObj.push([key, [loadedName, value[1]]]);
            })
          );
          break;
        case "BM":
          gStateObj.push([key, normalizeBlendMode(value)]);
          break;
        case "SMask":
          if (isName(value, "None")) {
            gStateObj.push([key, false]);
            break;
          }
          if (value instanceof Dict) {
            isSimpleGState = false;

            promise = promise.then(() =>
              this.handleSMask(
                value,
                resources,
                operatorList,
                task,
                stateManager,
                localColorSpaceCache,
                seenRefs
              )
            );
            gStateObj.push([key, true]);
          } else {
            warn("Unsupported SMask type");
          }
          break;
        case "TR":
          const transferMaps = this.handleTransferFunction(value);
          gStateObj.push([key, transferMaps]);
          break;
        // Only generate info log messages for the following since
        // they are unlikely to have a big impact on the rendering.
        case "OP":
        case "op":
        case "OPM":
        case "BG":
        case "BG2":
        case "UCR":
        case "UCR2":
        case "TR2":
        case "HT":
        case "SM":
        case "SA":
        case "AIS":
        case "TK":
          // TODO implement these operators.
          info("graphic state operator " + key);
          break;
        default:
          info("Unknown graphic state operator " + key);
          break;
      }
    }
    await promise;

    if (gStateObj.length > 0) {
      operatorList.addOp(OPS.setGState, [gStateObj]);
    }

    if (isSimpleGState) {
      localGStateCache.set(cacheKey, gStateRef, gStateObj);
    }
  }