fix: crop save always JPEG q93 + save rotated view 1:1 (v1.4.1)

- Output extension is always .jpg regardless of source format (was: PNG in -> PNG out)
- Rotation now saved correctly: viewport grid resampled bilinearly in source
  space (was: unrotated bounding box copy)
- Quality 90 -> 93; l10n strings updated (JPEG 93)
- New: tool/crop_test.dart — pure-Dart end-to-end test (dart run tool/crop_test.dart)

CHANGELOG.md

@@ -4,6 +4,12 @@ All notable changes to imajViewer are documented in this file.
 
 ## [Unreleased]
 
+## [1.4.1] - 2026-10-11
+
+### Fixed
+- Crop save always writes JPEG (previously kept the source extension, e.g. PNG) — quality 93
+- Crop save with rotation now saves the rotated view 1:1 instead of an unrotated bounding box
+
 ## [1.4.0] - 2026-10-11
 
 ### Added

lib/l10n/app_en.arb

@@ -6,10 +6,10 @@
   "sortByName": "By name",
   "appDescription": "Ultra-lightweight and fast image viewer. Open images and use arrows or keyboard keys to navigate.",
   "shortcuts": "Shortcuts",
-  "shortcutsList": "• Left/Right arrow — previous/next image\n• Ctrl+S — save visible area (JPEG 90)\n• Ctrl+Q — close window\n• Ctrl+Shift+Q — close all windows\n• Double click — toggle fill/fit\n• Right-drag — contrast\n• Shift+right-drag — rotate\n• Ctrl+right-drag — saturation\n• Ctrl+Shift+right-drag — brightness",
+  "shortcutsList": "• Left/Right arrow — previous/next image\n• Ctrl+S — save visible area (JPEG 93)\n• Ctrl+Q — close window\n• Ctrl+Shift+Q — close all windows\n• Double click — toggle fill/fit\n• Right-drag — contrast\n• Shift+right-drag — rotate\n• Ctrl+right-drag — saturation\n• Ctrl+Shift+right-drag — brightness",
   "print": "Print",
   "close": "Close",
-  "saveCrop": "Save visible area (JPEG 90)",
+  "saveCrop": "Save visible area (JPEG 93)",
   "cropSaved": "Saved: {path}",
   "@cropSaved": {
     "placeholders": {

lib/l10n/app_localizations.dart

@@ -137,7 +137,7 @@ abstract class AppLocalizations {
   /// No description provided for @shortcutsList.
   ///
   /// In en, this message translates to:
-  /// **'• Left/Right arrow — previous/next image\n• Ctrl+S — save visible area (JPEG 90)\n• Ctrl+Q — close window\n• Ctrl+Shift+Q — close all windows\n• Double click — toggle fill/fit\n• Right-drag — contrast\n• Shift+right-drag — rotate\n• Ctrl+right-drag — saturation\n• Ctrl+Shift+right-drag — brightness'**
+  /// **'• Left/Right arrow — previous/next image\n• Ctrl+S — save visible area (JPEG 93)\n• Ctrl+Q — close window\n• Ctrl+Shift+Q — close all windows\n• Double click — toggle fill/fit\n• Right-drag — contrast\n• Shift+right-drag — rotate\n• Ctrl+right-drag — saturation\n• Ctrl+Shift+right-drag — brightness'**
   String get shortcutsList;
 
   /// No description provided for @print.
@@ -155,7 +155,7 @@ abstract class AppLocalizations {
   /// No description provided for @saveCrop.
   ///
   /// In en, this message translates to:
-  /// **'Save visible area (JPEG 90)'**
+  /// **'Save visible area (JPEG 93)'**
   String get saveCrop;
 
   /// No description provided for @cropSaved.

lib/l10n/app_localizations_en.dart

@@ -29,7 +29,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get shortcutsList =>
-      '• Left/Right arrow — previous/next image\n• Ctrl+S — save visible area (JPEG 90)\n• Ctrl+Q — close window\n• Ctrl+Shift+Q — close all windows\n• Double click — toggle fill/fit\n• Right-drag — contrast\n• Shift+right-drag — rotate\n• Ctrl+right-drag — saturation\n• Ctrl+Shift+right-drag — brightness';
+      '• Left/Right arrow — previous/next image\n• Ctrl+S — save visible area (JPEG 93)\n• Ctrl+Q — close window\n• Ctrl+Shift+Q — close all windows\n• Double click — toggle fill/fit\n• Right-drag — contrast\n• Shift+right-drag — rotate\n• Ctrl+right-drag — saturation\n• Ctrl+Shift+right-drag — brightness';
 
   @override
   String get print => 'Print';
@@ -38,7 +38,7 @@ class AppLocalizationsEn extends AppLocalizations {
   String get close => 'Close';
 
   @override
-  String get saveCrop => 'Save visible area (JPEG 90)';
+  String get saveCrop => 'Save visible area (JPEG 93)';
 
   @override
   String cropSaved(String path) {

lib/l10n/app_localizations_tr.dart

@@ -29,7 +29,7 @@ class AppLocalizationsTr extends AppLocalizations {
 
   @override
   String get shortcutsList =>
-      '• Sol/Sağ ok — önceki/sonraki resim\n• Ctrl+S — görünen alanı kaydet (JPEG 90)\n• Ctrl+Q — pencereyi kapat\n• Ctrl+Shift+Q — tüm pencereleri kapat\n• Çift tık — doldur/sığdır geçişi\n• Sağ tık sürükle — kontrast\n• Shift+sağ tık — döndür\n• Ctrl+sağ tık — doygunluk\n• Ctrl+Shift+sağ tık — parlaklık';
+      '• Sol/Sağ ok — önceki/sonraki resim\n• Ctrl+S — görünen alanı kaydet (JPEG 93)\n• Ctrl+Q — pencereyi kapat\n• Ctrl+Shift+Q — tüm pencereleri kapat\n• Çift tık — doldur/sığdır geçişi\n• Sağ tık sürükle — kontrast\n• Shift+sağ tık — döndür\n• Ctrl+sağ tık — doygunluk\n• Ctrl+Shift+sağ tık — parlaklık';
 
   @override
   String get print => 'Yazdır';
@@ -38,7 +38,7 @@ class AppLocalizationsTr extends AppLocalizations {
   String get close => 'Kapat';
 
   @override
-  String get saveCrop => 'Görünen alanı kaydet (JPEG 90)';
+  String get saveCrop => 'Görünen alanı kaydet (JPEG 93)';
 
   @override
   String cropSaved(String path) {

lib/l10n/app_tr.arb

@@ -6,10 +6,10 @@
   "sortByName": "İsme göre",
   "appDescription": "Ultra hafif ve hızlı resim görüntüleyici. Görselleri açın, gezinti için okları veya klavye tuşlarını kullanın.",
   "shortcuts": "Kısayollar",
-  "shortcutsList": "• Sol/Sağ ok — önceki/sonraki resim\n• Ctrl+S — görünen alanı kaydet (JPEG 90)\n• Ctrl+Q — pencereyi kapat\n• Ctrl+Shift+Q — tüm pencereleri kapat\n• Çift tık — doldur/sığdır geçişi\n• Sağ tık sürükle — kontrast\n• Shift+sağ tık — döndür\n• Ctrl+sağ tık — doygunluk\n• Ctrl+Shift+sağ tık — parlaklık",
+  "shortcutsList": "• Sol/Sağ ok — önceki/sonraki resim\n• Ctrl+S — görünen alanı kaydet (JPEG 93)\n• Ctrl+Q — pencereyi kapat\n• Ctrl+Shift+Q — tüm pencereleri kapat\n• Çift tık — doldur/sığdır geçişi\n• Sağ tık sürükle — kontrast\n• Shift+sağ tık — döndür\n• Ctrl+sağ tık — doygunluk\n• Ctrl+Shift+sağ tık — parlaklık",
   "print": "Yazdır",
   "close": "Kapat",
-  "saveCrop": "Görünen alanı kaydet (JPEG 90)",
+  "saveCrop": "Görünen alanı kaydet (JPEG 93)",
   "cropSaved": "Kaydedildi: {path}",
   "@cropSaved": {
     "placeholders": {

lib/screens/viewer_screen.dart

@@ -198,14 +198,14 @@ class _ViewerScreenState extends State<ViewerScreen> with WindowListener {
     String? message;
     try {
       final source = await CropSaveService.load(path);
-      final rect = state.cropSourceRect(source.width, source.height);
-      if (rect == null || rect.isEmpty || !rect.isFinite) {
+      final vp = state.cropViewParams(source.width, source.height);
+      if (vp == null) {
         message = l10n.cropFailed;
       } else {
         final outPath = await CropSaveService.saveCrop(
           srcPath: path,
           source: source,
-          rect: rect,
+          vp: vp,
           matrix: state.activeColorMatrix,
         );
         message = l10n.cropSaved(outPath);

lib/services/crop_save_service.dart

@@ -1,5 +1,5 @@
 import 'dart:io';
-import 'dart:ui' show Rect;
+import 'dart:math' as math;
 import 'package:image/image.dart' as img;
 import 'package:path/path.dart' as p;
 
@@ -11,8 +11,34 @@ class CropSaveError implements Exception {
   String toString() => 'CropSaveError($code)';
 }
 
+/// Viewport -> tam cozunurluk kaynak eslemesi (image_canvas'tan gelir).
+class CropViewParams {
+  final int w, h; // kaynak dosya boyutu
+  final double vw, vh; // viewport boyutu
+  final double tx, ty, sc; // pan/zoom
+  final double angleDeg; // donus (derece)
+  final double cx, cy; // donus merkezi (viewport ortasi)
+  final double k; // kaynak -> layout olcegi
+  final double ox, oy; // layout offset
+  const CropViewParams({
+    required this.w,
+    required this.h,
+    required this.vw,
+    required this.vh,
+    required this.tx,
+    required this.ty,
+    required this.sc,
+    required this.angleDeg,
+    required this.cx,
+    required this.cy,
+    required this.k,
+    required this.ox,
+    required this.oy,
+  });
+}
+
 class CropSaveService {
-  /// Tam çözünürlükte decode + EXIF yönünü gömme (engine görüntüsüyle tutarlı).
+  /// Tam cozunurlukte decode + EXIF yonunu gomme (engine goruntusuyle tutarli).
   static Future<img.Image> load(String srcPath) async {
     final bytes = await File(srcPath).readAsBytes();
     final src = img.decodeImage(bytes);
@@ -20,50 +46,98 @@ class CropSaveService {
     return img.bakeOrientation(src);
   }
 
-  /// Hedef yol: `resim.jpg` -> `resim_143025.jpg` (çakışmada null).
+  /// Hedef yol: `resim.png` -> `resim_143025.jpg` (hep JPEG; cakismada null).
   static String? buildOutputPath(String srcPath) {
-    final ext = p.extension(srcPath);
     final base = p.basenameWithoutExtension(srcPath);
     final dir = p.dirname(srcPath);
     final now = DateTime.now();
     final hh = now.hour.toString().padLeft(2, '0');
     final mm = now.minute.toString().padLeft(2, '0');
     final ss = now.second.toString().padLeft(2, '0');
-    final candidate = p.join(dir, '${base}_$hh$mm$ss$ext');
+    final candidate = p.join(dir, '${base}_$hh$mm$ss.jpg');
     return File(candidate).existsSync() ? null : candidate;
   }
 
-  /// Crop + aktif renk matrisi + JPEG q90.
-  /// [matrix] 4x5 row-major renk matrisi (image_canvas ile aynı form, 0-255 alanı);
-  /// null = gömme yok.
+  /// Ekranda gorunen bolgeyi birebir (donus dahil) tam cozunurlukte kaydedir.
+  /// Duzlem: viewport -> (tx,ty,sc) -> (vp ortasi etrafinda donus) -> (k,ox,oy) -> kaynak px.
   static Future<String> saveCrop({
     required String srcPath,
     required img.Image source,
-    required Rect rect,
+    required CropViewParams vp,
     List<double>? matrix,
+    int jpegQuality = 93,
   }) async {
     final outPath = buildOutputPath(srcPath);
     if (outPath == null) throw const CropSaveError('file_exists');
 
-    final iw = source.width, ih = source.height;
-    final x = rect.left.round().clamp(0, iw - 1);
-    final y = rect.top.round().clamp(0, ih - 1);
-    final w = rect.right.round().clamp(x + 1, iw) - x;
-    final h = rect.bottom.round().clamp(y + 1, ih) - y;
-    if (w <= 0 || h <= 0) throw const CropSaveError('empty_rect');
-
-    final crop = img.copyCrop(source, x: x, y: y, width: w, height: h);
+    final out = vp.angleDeg == 0
+        ? _cropAxisAligned(source, vp)
+        : _cropRotated(source, vp);
     // Çıktıda yön fiziksel — EXIF tag'ini temizle (çift dönüşü önler).
-    crop.exif.imageIfd.orientation = null;
+    out.exif.imageIfd.orientation = null;
 
-    if (matrix != null) _applyMatrix(crop, matrix);
+    if (matrix != null) _applyMatrix(out, matrix);
 
-    final jpeg = img.JpegEncoder(quality: 90).encode(crop);
+    final jpeg = img.JpegEncoder(quality: jpegQuality).encode(out);
     await File(outPath).writeAsBytes(jpeg);
     return outPath;
   }
 
-  /// Flutter'la aynı 0-255 alan/semantiğindeki 4x5 matrisi uygular.
+  /// Donus yok: gorulen dikdortgeni birebir kes (hizli yol).
+  static img.Image _cropAxisAligned(img.Image src, CropViewParams vp) {
+    double toX(double vx) => ((vx - vp.tx) / vp.sc - vp.ox) / vp.k;
+    double toY(double vy) => ((vy - vp.ty) / vp.sc - vp.oy) / vp.k;
+    final x0 = toX(0), x1 = toX(vp.vw), y0 = toY(0), y1 = toY(vp.vh);
+    final x = x0.round().clamp(0, src.width - 1);
+    final y = y0.round().clamp(0, src.height - 1);
+    final xr = x1.round().clamp(x + 1, src.width);
+    final yr = y1.round().clamp(y + 1, src.height);
+    return img.copyCrop(src, x: x, y: y, width: xr - x, height: yr - y);
+  }
+
+  /// Donus var: ekran grid'ini kaynaga birebir ornekler (bilinear).
+  static img.Image _cropRotated(img.Image src, CropViewParams vp) {
+    final step = vp.sc * vp.k; // ekran px basina kaynak px
+    if (step <= 0) throw const CropSaveError('empty_rect');
+    final ow = (vp.vw / step).round().clamp(1, 1 << 14);
+    final oh = (vp.vh / step).round().clamp(1, 1 << 14);
+    final angle = vp.angleDeg * math.pi / 180;
+    final cos = math.cos(-angle), sin = math.sin(-angle);
+
+    (double, double) toSrc(double vx, double vy) {
+      final x = (vx - vp.tx) / vp.sc - vp.cx;
+      final y = (vy - vp.ty) / vp.sc - vp.cy;
+      return ((cos * x - sin * y + vp.cx - vp.ox) / vp.k,
+          (sin * x + cos * y + vp.cy - vp.oy) / vp.k);
+    }
+
+    final out = img.Image(width: ow, height: oh);
+    for (var y = 0; y < oh; y++) {
+      final vy = (y + 0.5) * step;
+      for (var x = 0; x < ow; x++) {
+        final s = toSrc((x + 0.5) * step, vy);
+        final c = _sampleBilinear(src, s.$1, s.$2);
+        out.setPixelRgb(x, y, c.$1, c.$2, c.$3);
+      }
+    }
+    return out;
+  }
+
+  /// Manuel bilinear ornekleme (package:image 4.x API'si).
+  static (int, int, int) _sampleBilinear(img.Image src, double fx, double fy) {
+    final x0 = fx.floor(), y0 = fy.floor();
+    final tx = (fx - x0).clamp(0.0, 1.0), ty = (fy - y0).clamp(0.0, 1.0);
+    final c00 = src.getPixelClamped(x0, y0), c10 = src.getPixelClamped(x0 + 1, y0),
+          c01 = src.getPixelClamped(x0, y0 + 1), c11 = src.getPixelClamped(x0 + 1, y0 + 1);
+    int lerp(num a, num b, double t) => (a + (b - a) * t).toInt();
+    return (
+      lerp(lerp(c00.r, c10.r, tx), lerp(c01.r, c11.r, tx), ty),
+      lerp(lerp(c00.g, c10.g, tx), lerp(c01.g, c11.g, tx), ty),
+      lerp(lerp(c00.b, c10.b, tx), lerp(c01.b, c11.b, tx), ty),
+    );
+  }
+
+  /// Flutter'la ayni 0-255 alan/semantigindaki 4x5 matrisi uygular.
   static void _applyMatrix(img.Image image, List<double> m) {
     for (final pixel in image) {
       final r = pixel.r.toDouble(), g = pixel.g.toDouble(), b = pixel.b.toDouble();

lib/widgets/image_canvas.dart

@@ -5,6 +5,7 @@ import 'package:flutter/gestures.dart';
 import 'package:flutter/scheduler.dart';
 import 'package:flutter/services.dart';
 import '../l10n/app_localizations.dart';
+import '../services/crop_save_service.dart';
 
 class ImageCanvas extends StatefulWidget {
   final String filePath;
@@ -396,42 +397,28 @@ class ImageCanvasState extends State<ImageCanvas> {
     return _cachedMatrix;
   }
 
-  /// Viewport'un görünen bölgesini kaynak (tam çözünürlük) uzayına eşler.
-  /// [w]x[h] = gerçek dosya boyutu. Degrade durumda null.
-  Rect? cropSourceRect(int w, int h) {
+  /// Viewport'un gorunen bolgesinin tam cozunurluktaki eslemesi (crop_save_service'e).
+  /// Degrade durumda null.
+  CropViewParams? cropViewParams(int w, int h) {
     if (_vpSize.width <= 0 || _vpSize.height <= 0 || w <= 0 || h <= 0) return null;
-    final cx = _vpSize.width / 2, cy = _vpSize.height / 2;
-    final rad = -_angle * math.pi / 180;
-    final cos = math.cos(rad), sin = math.sin(rad);
-
-    Offset toSrc(Offset p) {
-      final double qx = (p.dx - _tx) / _sc, qy = (p.dy - _ty) / _sc;
-      final double rx = (_angle == 0) ? qx : (cos * (qx - cx) - sin * (qy - cy) + cx);
-      final double ry = (_angle == 0) ? qy : (sin * (qx - cx) + cos * (qy - cy) + cy);
-      final double k = _isFilled
-          ? math.max(_vpSize.width / w, _vpSize.height / h)
-          : math.min(_vpSize.width / w, _vpSize.height / h);
-      final double ox = (_vpSize.width - w * k) / 2, oy = (_vpSize.height - h * k) / 2;
-      return Offset((rx - ox) / k, (ry - oy) / k);
-    }
-
-    final corners = [
-      toSrc(Offset.zero),
-      toSrc(Offset(_vpSize.width, 0)),
-      toSrc(Offset(_vpSize.width, _vpSize.height)),
-      toSrc(Offset(0, _vpSize.height)),
-    ];
-    double xmin = double.infinity, xmax = -double.infinity;
-    double ymin = double.infinity, ymax = -double.infinity;
-    for (final c in corners) {
-      xmin = math.min(xmin, c.dx); xmax = math.max(xmax, c.dx);
-      ymin = math.min(ymin, c.dy); ymax = math.max(ymax, c.dy);
-    }
-    return Rect.fromLTRB(
-      xmin.clamp(0.0, w.toDouble()),
-      ymin.clamp(0.0, h.toDouble()),
-      xmax.clamp(0.0, w.toDouble()),
-      ymax.clamp(0.0, h.toDouble()),
+    final k = _isFilled
+        ? math.max(_vpSize.width / w, _vpSize.height / h)
+        : math.min(_vpSize.width / w, _vpSize.height / h);
+    final ox = (_vpSize.width - w * k) / 2, oy = (_vpSize.height - h * k) / 2;
+    return CropViewParams(
+      w: w,
+      h: h,
+      vw: _vpSize.width,
+      vh: _vpSize.height,
+      tx: _tx,
+      ty: _ty,
+      sc: _sc,
+      angleDeg: _angle,
+      cx: _vpSize.width / 2,
+      cy: _vpSize.height / 2,
+      k: k,
+      ox: ox,
+      oy: oy,
     );
   }
 

pubspec.yaml

@@ -1,7 +1,7 @@
 name: imajviewer
 description: "Ultra-lightweight image viewer for Linux and Windows."
 publish_to: 'none'
-version: 1.4.0+8
+version: 1.4.1+9
 
 msix_config:
   display_name: ImajViewer

tool/crop_test.dart

@@ -0,0 +1,88 @@
+import 'dart:io';
+import 'package:image/image.dart' as img;
+import 'package:imajviewer/services/crop_save_service.dart';
+
+Future<void> main() async {
+  final tmp = Directory.systemTemp.createTempSync('crop_test');
+  final srcPath = '${tmp.path}/test.png';
+
+  final src = img.Image(width: 100, height: 50);
+  void fill(int x, int y, int r, int g, int b) {
+    for (var dy = 0; dy < 5; dy++)
+      for (var dx = 0; dx < 5; dx++) src.setPixelRgb(x + dx, y + dy, r, g, b);
+  }
+  fill(0, 0, 255, 0, 0); // sol-ust: KIRMIZI
+  fill(95, 0, 0, 255, 0); // sag-ust: YESIL
+  fill(0, 45, 0, 0, 255); // sol-alt: MAVI
+  fill(95, 45, 255, 255, 0); // sag-alt: SARI
+  File(srcPath).writeAsBytesSync(img.encodePng(src)!);
+
+  var fails = 0;
+  void checkPix(String label, (int, int, int) px, int r, int g, int b) {
+    int d(int a, int c) => (a - c).abs();
+    final ok = d(px.$1, r) <= 60 && d(px.$2, g) <= 60 && d(px.$3, b) <= 60;
+    if (!ok) fails++;
+    print('${ok ? 'OK  ' : 'FAIL'} $label: got ${px.$1},${px.$2},${px.$3} want ~$r,$g,$b');
+  }
+
+  // 1) Duz, fit, zoom yok: gorunen = kaynakin kendisi
+  final outDir1 = '${tmp.path}/a';
+  Directory(outDir1).createSync();
+  final f1 = '${outDir1}/src.jpg';
+  File(f1).writeAsBytesSync(File(srcPath).readAsBytesSync());
+  final p1 = CropViewParams(w: 100, h: 50, vw: 100, vh: 50, tx: 0, ty: 0, sc: 1,
+      angleDeg: 0, cx: 50, cy: 25, k: 1, ox: 0, oy: 0);
+  final path1 = await CropSaveService.saveCrop(srcPath: f1, source: await CropSaveService.load(f1), vp: p1);
+  final r1 = img.decodeImage(File(path1).readAsBytesSync())!;
+  print('1) dims ${r1.width}x${r1.height} (100x50 beklenir)');
+  if (r1.width != 100 || r1.height != 50 || !path1.endsWith('.jpg')) fails++;
+  checkPix('1) sol-ust', imgPx(r1, 2, 2), 255, 0, 0);
+  checkPix('1) sag-alt', imgPx(r1, 97, 47), 255, 255, 0);
+
+  // 2) 90 derece saat yelkolevi: cikti 50x100, orij sol-alt -> yeni sol-ust
+  final out2 = '${tmp.path}/b';
+  Directory(out2).createSync();
+  final f2 = '$out2/src.jpg';
+  File(f2).writeAsBytesSync(File(srcPath).readAsBytesSync());
+  final p2 = CropViewParams(w: 100, h: 50, vw: 50, vh: 100, tx: 0, ty: 0, sc: 1,
+      angleDeg: 90, cx: 25, cy: 50, k: 1, ox: -25, oy: 25);
+  final path2 = await CropSaveService.saveCrop(srcPath: f2, source: await CropSaveService.load(f2), vp: p2);
+  final r2 = img.decodeImage(File(path2).readAsBytesSync())!;
+  print('2) dims ${r2.width}x${r2.height} (50x100 beklenir)');
+  if (r2.width != 50 || r2.height != 100) fails++;
+  checkPix('2) sol-ust (orij sol-alt MAVI)', imgPx(r2, 2, 2), 0, 0, 255);
+  checkPix('2) sag-ust (orij sol-ust KIRMIZI)', imgPx(r2, 47, 2), 255, 0, 0);
+  checkPix('2) sol-alt (orij sag-alt SARI)', imgPx(r2, 2, 97), 255, 255, 0);
+  checkPix('2) sag-alt (orij sag-ust YESIL)', imgPx(r2, 47, 97), 0, 255, 0);
+
+  // 3) Zoom x2, 45 derece, fill: orneklenen alan ortada
+  final out3 = '${tmp.path}/c';
+  Directory(out3).createSync();
+  final f3 = '$out3/src.jpg';
+  File(f3).writeAsBytesSync(File(srcPath).readAsBytesSync());
+  final p3 = CropViewParams(w: 100, h: 50, vw: 100, vh: 100, tx: 0, ty: 0, sc: 2,
+      angleDeg: 45, cx: 50, cy: 50, k: 2, ox: 0, oy: -25);
+  final path3 = await CropSaveService.saveCrop(srcPath: f3, source: await CropSaveService.load(f3), vp: p3);
+  final r3 = img.decodeImage(File(path3).readAsBytesSync())!;
+  print('3) dims ${r3.width}x${r3.height} (25x25 beklenir: zoom x2 + fill k=2 -> 4 src px/ekran px)');
+  if (r3.width != 25 || r3.height != 25) fails++;
+
+  tmp.deleteSync(recursive: true);
+  print(fails == 0 ? 'ALL PASS' : '$fails FAILURES');
+  exitCode = fails == 0 ? 0 : 1;
+}
+
+// jpeg kaybi oldugu icin 5x5 bolge ortalamasi al
+(int, int, int) imgPx(img.Image im, int x, int y) {
+  int avg(int f) {
+    var s = 0, n = 0;
+    for (var dy = -2; dy <= 2; dy++)
+      for (var dx = -2; dx <= 2; dx++) {
+        final px = im.getPixelClamped(x + dx, y + dy);
+        s += f == 0 ? px.r.toInt() : (f == 1 ? px.g.toInt() : px.b.toInt());
+        n++;
+      }
+    return s ~/ n;
+  }
+  return (avg(0), avg(1), avg(2));
+}