Add 'Remove duplicate fonts' option to PDF merge functionality

public/locales/en/tools.json

@@ -19,7 +19,8 @@
     "name": "Merge PDF",
     "subtitle": "Combine multiple PDFs into one file. Preserves Bookmarks.",
     "retainPageLabels": "Keep original page labels from each file",
-    "retainPageLabelsHint": "Off (default): the merged PDF uses natural page numbering 1–N. On: each file's original page labels are preserved (may produce duplicate labels)."
+    "retainPageLabelsHint": "Off (default): the merged PDF uses natural page numbering 1–N. On: each file's original page labels are preserved (may produce duplicate labels).",
+    "removeDuplicateFonts": "Remove duplicate fonts"
   },
   "splitPdf": {
     "name": "Split PDF",

public/workers/merge.worker.js

@@ -21,7 +21,14 @@ function loadCpdf(cpdfUrl) {
 }
 
 self.onmessage = async function (e) {
-  const { command, files, jobs, cpdfUrl, retainPageLabels } = e.data;
+  const {
+    command,
+    files,
+    jobs,
+    cpdfUrl,
+    retainPageLabels,
+    removeDuplicateFonts,
+  } = e.data;
 
   if (!cpdfUrl) {
     self.postMessage({
@@ -43,11 +50,16 @@ self.onmessage = async function (e) {
   }
 
   if (command === 'merge') {
-    mergePDFs(files, jobs, retainPageLabels === true);
+    mergePDFs(
+      files,
+      jobs,
+      retainPageLabels === true,
+      removeDuplicateFonts === true
+    );
   }
 };
 
-function mergePDFs(files, jobs, retainPageLabels) {
+function mergePDFs(files, jobs, retainPageLabels, removeDuplicateFonts) {
   try {
     const loadedPdfs = {};
     const pdfsToMerge = [];
@@ -90,7 +102,7 @@ function mergePDFs(files, jobs, retainPageLabels) {
     const mergedPdf = coherentpdf.mergeSame(
       pdfsToMerge,
       retainPageLabels,
-      true,
+      removeDuplicateFonts,
       rangesToMerge
     );
 

src/js/logic/merge-pdf-page.ts

@@ -389,12 +389,17 @@ export async function merge() {
       'retain-page-labels'
     ) as HTMLInputElement | null;
 
+    const removeDuplicateFontsCheckbox = document.getElementById(
+      'remove-duplicate-fonts'
+    ) as HTMLInputElement | null;
+
     const message: MergeMessage = {
       command: 'merge',
       files: filesToMerge,
       jobs: jobs,
       cpdfUrl: WasmProvider.getUrl('cpdf')! + 'coherentpdf.browser.min.js',
       retainPageLabels: retainCheckbox?.checked ?? false,
+      removeDuplicateFonts: removeDuplicateFontsCheckbox?.checked ?? false,
     };
 
     mergeWorker.postMessage(

src/js/types/merge-worker-type.ts

@@ -18,6 +18,7 @@ export interface MergeMessage {
   jobs: MergeJob[];
   cpdfUrl?: string;
   retainPageLabels?: boolean;
+  removeDuplicateFonts?: boolean;
 }
 
 export interface MergeSuccessResponse {

src/pages/merge-pdf.html

@@ -270,6 +270,22 @@
             </span>
           </label>
 
+          <label
+            class="mt-4 flex items-start gap-2 text-sm text-gray-300 cursor-pointer"
+          >
+            <input
+              type="checkbox"
+              id="remove-duplicate-fonts"
+              class="mt-0.5 w-4 h-4 rounded text-indigo-600 bg-gray-700 border-gray-600"
+            />
+            <span
+              class="font-medium"
+              data-i18n="tools:mergePdf.removeDuplicateFonts"
+            >
+              Remove duplicate fonts
+            </span>
+          </label>
+
           <button id="process-btn" class="btn-gradient w-full mt-6">
             Merge PDFs
           </button>