Do the AppOptions.get("printResolution") lookup once in web/app.js, when initializing PDFPrintServiceFactory-instances, rather than for every printed page

There's really no point in repeating these lookups over and over, since the value should be constant for the duration of one print invocation anyway.

web/firefox_print_service.js

@@ -13,18 +13,22 @@
  * limitations under the License.
  */
 
-import { AppOptions } from "./app_options.js";
 import { CSS_UNITS } from "./ui_utils.js";
 import { PDFPrintServiceFactory } from "./app.js";
 import { shadow } from "pdfjs-lib";
 
 // Creates a placeholder with div and canvas with right size for the page.
-function composePage(pdfDocument, pageNumber, size, printContainer) {
+function composePage(
+  pdfDocument,
+  pageNumber,
+  size,
+  printContainer,
+  printResolution
+) {
   const canvas = document.createElement("canvas");
 
   // The size of the canvas in pixels for printing.
-  const PRINT_RESOLUTION = AppOptions.get("printResolution") || 150;
-  const PRINT_UNITS = PRINT_RESOLUTION / 72.0;
+  const PRINT_UNITS = printResolution / 72.0;
   canvas.width = Math.floor(size.width * PRINT_UNITS);
   canvas.height = Math.floor(size.height * PRINT_UNITS);
 
@@ -76,21 +80,38 @@ function composePage(pdfDocument, pageNumber, size, printContainer) {
   };
 }
 
-function FirefoxPrintService(pdfDocument, pagesOverview, printContainer) {
+function FirefoxPrintService(
+  pdfDocument,
+  pagesOverview,
+  printContainer,
+  printResolution
+) {
   this.pdfDocument = pdfDocument;
   this.pagesOverview = pagesOverview;
   this.printContainer = printContainer;
+  this._printResolution = printResolution || 150;
 }
 
 FirefoxPrintService.prototype = {
   layout() {
-    const { pdfDocument, pagesOverview, printContainer } = this;
+    const {
+      pdfDocument,
+      pagesOverview,
+      printContainer,
+      _printResolution,
+    } = this;
 
     const body = document.querySelector("body");
     body.setAttribute("data-pdfjsprinting", true);
 
     for (let i = 0, ii = pagesOverview.length; i < ii; ++i) {
-      composePage(pdfDocument, i + 1, pagesOverview[i], printContainer);
+      composePage(
+        pdfDocument,
+        /* pageNumber = */ i + 1,
+        pagesOverview[i],
+        printContainer,
+        _printResolution
+      );
     }
   },
 
@@ -110,8 +131,18 @@ PDFPrintServiceFactory.instance = {
     return shadow(this, "supportsPrinting", value);
   },
 
-  createPrintService(pdfDocument, pagesOverview, printContainer) {
-    return new FirefoxPrintService(pdfDocument, pagesOverview, printContainer);
+  createPrintService(
+    pdfDocument,
+    pagesOverview,
+    printContainer,
+    printResolution
+  ) {
+    return new FirefoxPrintService(
+      pdfDocument,
+      pagesOverview,
+      printContainer,
+      printResolution
+    );
   },
 };