feat: Add document scanner package

2025-12-16 20:12:22 -06:00 · 2023-02-22 18:17:50 +01:00
parent a8a41b38a8
commit 9c5a45f329
105 changed files with 3998 additions and 0 deletions
--- a/packages/paperless_document_scanner/lib/modules/edge_detection.dart
+++ b/packages/paperless_document_scanner/lib/modules/edge_detection.dart
@@ -0,0 +1,87 @@
+import 'dart:ffi';
+import 'dart:io';
+import 'dart:typed_data';
+import 'dart:ui';
+
+import 'package:ffi/ffi.dart';
+import 'package:paperless_document_scanner/types/edge_detection_result.dart';
+
+final DynamicLibrary _nativeInteropLib = Platform.isAndroid
+    ? DynamicLibrary.open("libnative_edge_detection.so")
+    : DynamicLibrary.process();
+
+class EdgeDetection {
+  static Future<EdgeDetectionResult> detectEdgesFromFile(String path) async {
+    final detectEdges = _nativeInteropLib
+        .lookup<NativeFunction<_c_detect_edges_from_file>>(
+            "detect_edges_from_file")
+        .asFunction<_dart_detect_edges_from_file>();
+
+    NativeEdgeDetectionResult detectionResult =
+        detectEdges(path.toNativeUtf8()).ref;
+
+    return EdgeDetectionResult(
+        topLeft: Offset(
+            detectionResult.topLeft.ref.x, detectionResult.topLeft.ref.y),
+        topRight: Offset(
+            detectionResult.topRight.ref.x, detectionResult.topRight.ref.y),
+        bottomLeft: Offset(
+            detectionResult.bottomLeft.ref.x, detectionResult.bottomLeft.ref.y),
+        bottomRight: Offset(detectionResult.bottomRight.ref.x,
+            detectionResult.bottomRight.ref.y));
+  }
+
+  static Future<EdgeDetectionResult> detectEdges(Uint8List bytes) async {
+    final detectEdges = _nativeInteropLib
+        .lookup<NativeFunction<_c_detect_edges>>("detect_edges")
+        .asFunction<_dart_detect_edges>();
+
+    Pointer<Uint8> imgBuffer = malloc.allocate<Uint8>(bytes.lengthInBytes);
+    Uint8List buffer = imgBuffer.asTypedList(bytes.lengthInBytes);
+    buffer.setAll(0, bytes);
+
+    NativeEdgeDetectionResult detectionResult = detectEdges(
+      imgBuffer,
+      buffer.lengthInBytes,
+    ).ref;
+
+    final result = EdgeDetectionResult(
+      topLeft: Offset(
+        detectionResult.topLeft.ref.x,
+        detectionResult.topLeft.ref.y,
+      ),
+      topRight: Offset(
+        detectionResult.topRight.ref.x,
+        detectionResult.topRight.ref.y,
+      ),
+      bottomLeft: Offset(
+        detectionResult.bottomLeft.ref.x,
+        detectionResult.bottomLeft.ref.y,
+      ),
+      bottomRight: Offset(
+        detectionResult.bottomRight.ref.x,
+        detectionResult.bottomRight.ref.y,
+      ),
+    );
+    return result;
+  }
+}
+
+typedef _c_detect_edges_from_file = Pointer<NativeEdgeDetectionResult> Function(
+  Pointer<Utf8> imagePath,
+);
+
+typedef _c_detect_edges = Pointer<NativeEdgeDetectionResult> Function(
+  Pointer<Uint8> bytes,
+  Int32 byteSize,
+);
+
+typedef _dart_detect_edges_from_file = Pointer<NativeEdgeDetectionResult>
+    Function(
+  Pointer<Utf8> imagePath,
+);
+
+typedef _dart_detect_edges = Pointer<NativeEdgeDetectionResult> Function(
+  Pointer<Uint8> bytes,
+  int byteSize,
+);