Add ID card dual pdf and set default filter in system interface to BASE

android/app/src/main/java/com/lensapp/PdfGeneratorModule.kt

@@ -28,6 +28,61 @@ class PdfGeneratorModule(private val reactContext: ReactApplicationContext) :
         return out
     }
 
+    @ReactMethod
+    fun generateIdCard(imagePaths: ReadableArray, fileName: String, matrix: ReadableArray, promise: Promise) {
+        try {
+            val count = imagePaths.size()
+            if (count == 0) throw Exception("No images provided")
+            val outDir = File(reactContext.filesDir, "pdfs").also { it.mkdirs() }
+            val outFile = File(outDir, "$fileName.pdf")
+            val doc = PdfDocument()
+
+            // A4 portrait: 595 x 842 points
+            val pageWidth = 595
+            val pageHeight = 842
+            val slotW = 250
+            val slotH = 180
+            val gap = 16
+            val totalW = slotW * 2 + gap
+            val startX = (pageWidth - totalW) / 2f
+            val startY = (pageHeight - slotH) / 2f
+
+            val numPages = (count + 1) / 2
+            for (p in 0 until numPages) {
+                val pageInfo = PdfDocument.PageInfo.Builder(pageWidth, pageHeight, p + 1).create()
+                val page = doc.startPage(pageInfo)
+
+                for (slot in 0 until 2) {
+                    val imgIndex = p * 2 + slot
+                    if (imgIndex >= count) break
+
+                    val path = imagePaths.getString(imgIndex)!!.removePrefix("file://")
+                    val raw = BitmapFactory.decodeFile(path) ?: throw Exception("Failed to decode image: $path")
+                    val bitmap = applyFilter(raw, matrix)
+                    if (raw !== bitmap) raw.recycle()
+
+                    val slotLeft = startX + slot * (slotW + gap)
+                    val scale = minOf(slotW.toFloat() / bitmap.width, slotH.toFloat() / bitmap.height)
+                    val scaledW = bitmap.width * scale
+                    val scaledH = bitmap.height * scale
+                    val left = slotLeft + (slotW - scaledW) / 2f
+                    val top = startY + (slotH - scaledH) / 2f
+
+                    page.canvas.drawBitmap(bitmap, null, RectF(left, top, left + scaledW, top + scaledH), null)
+                    bitmap.recycle()
+                }
+
+                doc.finishPage(page)
+            }
+
+            FileOutputStream(outFile).use { doc.writeTo(it) }
+            doc.close()
+            promise.resolve("file://${outFile.absolutePath}")
+        } catch (e: Exception) {
+            promise.reject("PDF_ERROR", e.message, e)
+        }
+    }
+
     @ReactMethod
     fun generate(imagePaths: ReadableArray, fileName: String, matrix: ReadableArray, promise: Promise) {
         try {

patches/react-native-document-scanner-plugin+2.0.4.patch

@@ -1,3 +1,16 @@
+diff --git a/node_modules/react-native-document-scanner-plugin/android/src/main/java/com/documentscanner/DocumentScannerModule.kt b/node_modules/react-native-document-scanner-plugin/android/src/main/java/com/documentscanner/DocumentScannerModule.kt
+index fbb6836..e75b6b2 100644
+--- a/node_modules/react-native-document-scanner-plugin/android/src/main/java/com/documentscanner/DocumentScannerModule.kt
++++ b/node_modules/react-native-document-scanner-plugin/android/src/main/java/com/documentscanner/DocumentScannerModule.kt
+@@ -51,7 +51,7 @@ class DocumentScannerModule(reactContext: ReactApplicationContext) :
+
+     val documentScannerOptionsBuilder = GmsDocumentScannerOptions.Builder()
+       .setResultFormats(GmsDocumentScannerOptions.RESULT_FORMAT_JPEG)
+-      .setScannerMode(GmsDocumentScannerOptions.SCANNER_MODE_FULL)
++      .setScannerMode(GmsDocumentScannerOptions.SCANNER_MODE_BASE)
+
+     if (options.hasKey("maxNumDocuments")) {
+       documentScannerOptionsBuilder.setPageLimit(
 diff --git a/node_modules/react-native-document-scanner-plugin/android/src/main/java/com/documentscanner/DocumentScannerPackage.kt b/node_modules/react-native-document-scanner-plugin/android/src/main/java/com/documentscanner/DocumentScannerPackage.kt
 index 84f3fec..54a8f53 100644
 --- a/node_modules/react-native-document-scanner-plugin/android/src/main/java/com/documentscanner/DocumentScannerPackage.kt

src/screens/ViewerScreen.tsx

@@ -16,7 +16,7 @@ import {
 import Share from 'react-native-share';
 import {ColorMatrix} from 'react-native-color-matrix-image-filters';
 import {ScannedDocument} from '../types';
-import {generatePdf} from '../utils/generatePdf';
+import {generatePdf, generateIdCardPdf} from '../utils/generatePdf';
 import {getFilterMatrix} from '../utils/filterMatrices';
 import {useTheme} from '../theme';
 
@@ -36,6 +36,25 @@ export default function ViewerScreen({document, onBack, onDelete, onRename}: Pro
   const [renaming, setRenaming] = useState(false);
   const [renameText, setRenameText] = useState('');
 
+  const shareIdCard = async () => {
+    setGenerating(true);
+    await new Promise(resolve => setTimeout(resolve, 0));
+    try {
+      const label = `${document.name} — ID Card`;
+      const pdfPath = await generateIdCardPdf(document.pages, label, document.filter);
+      await Share.open({
+        title: label,
+        type: 'application/pdf',
+        url: pdfPath,
+        failOnCancel: false,
+      });
+    } catch (err: any) {
+      Alert.alert('Share failed', err?.message ?? 'Could not generate PDF.');
+    } finally {
+      setGenerating(false);
+    }
+  };
+
   const sharePdf = async (pageIndices?: number[]) => {
     setGenerating(true);
     await new Promise(resolve => setTimeout(resolve, 0));
@@ -132,6 +151,10 @@ export default function ViewerScreen({document, onBack, onDelete, onRename}: Pro
           <Text style={[styles.toolIcon, {color: t.accent}]}>📄</Text>
           <Text style={[styles.toolLabel, {color: t.accent}]}>Share All</Text>
         </TouchableOpacity>
+        <TouchableOpacity style={styles.toolBtn} onPress={shareIdCard} disabled={generating}>
+          <Text style={[styles.toolIcon, {color: t.accent}]}>🪪</Text>
+          <Text style={[styles.toolLabel, {color: t.accent}]}>ID Card</Text>
+        </TouchableOpacity>
         <TouchableOpacity
           style={styles.toolBtn}
           onPress={() => {setRenameText(document.name); setRenaming(true);}}>

src/utils/generatePdf.ts

@@ -9,3 +9,9 @@ export async function generatePdf(pages: ScannedPage[], name: string, filter: Fi
   const fileName = name.replace(/[^a-z0-9_\-]/gi, '_');
   return PdfGenerator.generate(imagePaths, fileName, getFilterMatrix(filter));
 }
+
+export async function generateIdCardPdf(pages: ScannedPage[], name: string, filter: FilterMode = 'original'): Promise<string> {
+  const imagePaths = pages.map(p => p.uri);
+  const fileName = name.replace(/[^a-z0-9_\-]/gi, '_');
+  return PdfGenerator.generateIdCard(imagePaths, fileName, getFilterMatrix(filter));
+}