[GeckoView] Bundle the Firefox printing code in the viewer (bug 1810111)

This may not be enough, on its own, to completely fix [bug 1810111](https://bugzilla.mozilla.org/show_bug.cgi?id=1810111) however it's impossible for printing to work in GeckoView without this patch.
mozilla · May 4, 2023 · 2987041 · 2987041
1 parent 2fab583
commit 2987041
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Showing 4 changed files with 58 additions and 2 deletions.
diff --git a/gulpfile.js b/gulpfile.js
@@ -267,10 +267,9 @@ function createWebpackConfig(
       for (const key in viewerAlias) {
         viewerAlias[key] = gvAlias[key] || "web/stubs-geckoview.js";
       }
-    } else {
-      viewerAlias["web-print_service"] = "web/firefox_print_service.js";
     }
     viewerAlias["web-com"] = "web/firefoxcom.js";
+    viewerAlias["web-print_service"] = "web/firefox_print_service.js";
   }
   const alias = { ...basicAlias, ...viewerAlias };
   for (const key in alias) {

diff --git a/web/viewer-geckoview.css b/web/viewer-geckoview.css
@@ -282,3 +282,57 @@ dialog :link {
 @page {
   margin: 0;
 }
+
+#printContainer {
+  display: none;
+}
+
+@media print {
+  body {
+    background: rgba(0, 0, 0, 0) none;
+  }
+  body[data-pdfjsprinting] #outerContainer {
+    display: none;
+  }
+  body[data-pdfjsprinting] #printContainer {
+    display: block;
+  }
+  #printContainer {
+    height: 100%;
+  }
+  /* wrapper around (scaled) print canvas elements */
+  #printContainer > .printedPage {
+    page-break-after: always;
+    page-break-inside: avoid;
+
+    /* The wrapper always cover the whole page. */
+    height: 100%;
+    width: 100%;
+
+    display: flex;
+    flex-direction: column;
+    justify-content: center;
+    align-items: center;
+  }
+
+  #printContainer > .xfaPrintedPage .xfaPage {
+    position: absolute;
+  }
+
+  #printContainer > .xfaPrintedPage {
+    page-break-after: always;
+    page-break-inside: avoid;
+    width: 100%;
+    height: 100%;
+    position: relative;
+  }
+
+  #printContainer > .printedPage :is(canvas, img) {
+    /* The intrinsic canvas / image size will make sure that we fit the page. */
+    max-width: 100%;
+    max-height: 100%;
+
+    direction: ltr;
+    display: block;
+  }
+}
diff --git a/web/viewer-geckoview.html b/web/viewer-geckoview.html
@@ -108,6 +108,7 @@
       </div>  <!-- dialogContainer -->
 
     </div> <!-- outerContainer -->
+    <div id="printContainer"></div>
 
 <!--#if !MOZCENTRAL-->
     <input type="file" id="fileInput" class="hidden">

diff --git a/web/viewer-geckoview.js b/web/viewer-geckoview.js
@@ -14,6 +14,7 @@
  */
 
 import "web-com";
+import "web-print_service";
 import { RenderingStates, ScrollMode, SpreadMode } from "./ui_utils.js";
 import { AppOptions } from "./app_options.js";
 import { LinkTarget } from "./pdf_link_service.js";
@@ -54,6 +55,7 @@ function getViewerConfiguration() {
       submitButton: document.getElementById("passwordSubmit"),
       cancelButton: document.getElementById("passwordCancel"),
     },
+    printContainer: document.getElementById("printContainer"),
     openFileInput:
       typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")
         ? document.getElementById("fileInput")