add two views

2026-10-27 15:00:16 +01:00
parent 864da57537
commit 07a1bb02fd
42 changed files with 3582 additions and 346 deletions
@@ -0,0 +1,67 @@
+import 'dart:math' as math;
+import 'dart:typed_data';
+import 'dart:ui' as ui;
+
+import 'package:file_selector/file_selector.dart';
+
+class BauteilPhotoService {
+  Future<Uint8List?> pickPhoto() async {
+    const images = XTypeGroup(
+      label: 'Fotos',
+      extensions: ['jpg', 'jpeg', 'png', 'webp'],
+      uniformTypeIdentifiers: [
+        'public.jpeg',
+        'public.png',
+        'org.webmproject.webp',
+      ],
+      mimeTypes: ['image/jpeg', 'image/png', 'image/webp'],
+    );
+    final file = await openFile(acceptedTypeGroups: [images]);
+    if (file == null) return null;
+    if (await file.length() > 15 * 1024 * 1024) {
+      throw const FormatException('Das Foto darf höchstens 15 MB groß sein.');
+    }
+    return preparePhoto(await file.readAsBytes());
+  }
+
+  /// Stores a small, self-contained PNG, independent of temporary file paths.
+  Future<Uint8List> preparePhoto(Uint8List bytes) async {
+    final buffer = await ui.ImmutableBuffer.fromUint8List(bytes);
+    try {
+      final descriptor = await ui.ImageDescriptor.encoded(buffer);
+      try {
+        final scale = math.min(
+          1.0,
+          960 / math.max(descriptor.width, descriptor.height),
+        );
+        final codec = await descriptor.instantiateCodec(
+          targetWidth: math.max(1, (descriptor.width * scale).round()),
+          targetHeight: math.max(1, (descriptor.height * scale).round()),
+        );
+        try {
+          final frame = await codec.getNextFrame();
+          try {
+            final data = await frame.image.toByteData(
+              format: ui.ImageByteFormat.png,
+            );
+            if (data == null) {
+              throw const FormatException('Foto konnte nicht gelesen werden.');
+            }
+            return data.buffer.asUint8List(
+              data.offsetInBytes,
+              data.lengthInBytes,
+            );
+          } finally {
+            frame.image.dispose();
+          }
+        } finally {
+          codec.dispose();
+        }
+      } finally {
+        descriptor.dispose();
+      }
+    } finally {
+      buffer.dispose();
+    }
+  }
+}