feat: klasor tabanli galeri, brightness efekti (Ctrl+Shift+sag tik), .deb guncellendi

lib/widgets/image_canvas.dart

@@ -21,13 +21,15 @@ class _ImageCanvasState extends State<ImageCanvas> {
   double _angle = 0;
   double _contrast = 1.0;
   double _saturation = 1.0;
+  double _brightness = 0;
 
   // ── Gesture tracking ──
-  String _interactionMode = 'none'; // 'contrast' | 'rotate' | 'saturation'
+  String _interactionMode = 'none'; // 'contrast' | 'rotate' | 'saturation' | 'brightness'
   Offset _pointerDownPos = Offset.zero;
   double _startAngle = 0;
   double _startContrast = 1.0;
   double _startSaturation = 1.0;
+  double _startBrightness = 0;
   DateTime? _lastRightTapTime;
   Offset _lastRightTapPos = Offset.zero;
 
@@ -139,14 +141,14 @@ class _ImageCanvasState extends State<ImageCanvas> {
   void _resetView() {
     setState(() {
       _tx = 0; _ty = 0; _sc = 1.0; _isFilled = true; _vpSize = Size.zero;
-      _angle = 0; _contrast = 1.0; _saturation = 1.0;
+      _angle = 0; _contrast = 1.0; _saturation = 1.0; _brightness = 0;
     });
   }
 
   void _toggleFillFit() {
     setState(() {
       _isFilled = !_isFilled; _tx = 0; _ty = 0; _sc = 1.0; _vpSize = Size.zero;
-      _angle = 0; _contrast = 1.0; _saturation = 1.0;
+      _angle = 0; _contrast = 1.0; _saturation = 1.0; _brightness = 0;
     });
   }
 
@@ -196,6 +198,7 @@ class _ImageCanvasState extends State<ImageCanvas> {
         _angle = 0;
         _contrast = 1.0;
         _saturation = 1.0;
+        _brightness = 0;
         _interactionMode = 'none';
       });
       _lastRightTapTime = null;
@@ -204,7 +207,10 @@ class _ImageCanvasState extends State<ImageCanvas> {
     _lastRightTapTime = now;
     _lastRightTapPos = e.localPosition;
 
-    if (_ctrlPressed) {
+    if (_ctrlPressed && _shiftPressed) {
+      _interactionMode = 'brightness';
+      _startBrightness = _brightness;
+    } else if (_ctrlPressed) {
       _interactionMode = 'saturation';
       _startSaturation = _saturation;
     } else if (_shiftPressed) {
@@ -237,6 +243,11 @@ class _ImageCanvasState extends State<ImageCanvas> {
           _saturation = (_startSaturation + dy * 0.005).clamp(0.0, 2.0);
         });
         break;
+      case 'brightness':
+        setState(() {
+          _brightness = (_startBrightness + dy * 0.5).clamp(-100.0, 100.0);
+        });
+        break;
     }
   }
 
@@ -244,7 +255,7 @@ class _ImageCanvasState extends State<ImageCanvas> {
     _interactionMode = 'none';
   }
 
-  // ── Combined color filter (saturation × contrast) ──
+  // ── Combined color filter (brightness × saturation × contrast) ──
 
   static const double _rLum = 0.2126;
   static const double _gLum = 0.7152;
@@ -253,29 +264,72 @@ class _ImageCanvasState extends State<ImageCanvas> {
   ColorFilter? _cachedFilter;
   double _cachedSat = -1;
   double _cachedCon = -1;
+  double _cachedBri = double.nan;
+
+  List<double> _multiply4x5(List<double> a, List<double> b) {
+    final result = List<double>.filled(20, 0.0);
+    for (int row = 0; row < 4; row++) {
+      for (int col = 0; col < 4; col++) {
+        double sum = 0.0;
+        for (int k = 0; k < 4; k++) {
+          sum += a[row * 5 + k] * b[k * 5 + col];
+        }
+        result[row * 5 + col] = sum;
+      }
+      double offsetSum = a[row * 5 + 4];
+      for (int k = 0; k < 4; k++) {
+        offsetSum += a[row * 5 + k] * b[k * 5 + 4];
+      }
+      result[row * 5 + 4] = offsetSum;
+    }
+    return result;
+  }
 
   ColorFilter _buildCombinedFilter() {
-    if (_cachedFilter != null && _cachedSat == _saturation && _cachedCon == _contrast) {
+    if (_cachedFilter != null &&
+        _cachedSat == _saturation &&
+        _cachedCon == _contrast &&
+        _cachedBri == _brightness) {
       return _cachedFilter!;
     }
     _cachedSat = _saturation;
     _cachedCon = _contrast;
+    _cachedBri = _brightness;
 
     final s = _saturation;
     final c = _contrast;
-    final t = (1.0 - c) / 2.0;
+    final b = _brightness;
     final invS = 1.0 - s;
 
     final sR_R = invS * _rLum + s, sR_G = invS * _gLum,     sR_B = invS * _bLum;
     final sG_R = invS * _rLum,     sG_G = invS * _gLum + s, sG_B = invS * _bLum;
     final sB_R = invS * _rLum,     sB_G = invS * _gLum,     sB_B = invS * _bLum + s;
 
-    _cachedFilter = ColorFilter.matrix(<double>[
-      c * sR_R, c * sR_G, c * sR_B, 0, t,
-      c * sG_R, c * sG_G, c * sG_B, 0, t,
-      c * sB_R, c * sB_G, c * sB_B, 0, t,
-      0,        0,        0,        1, 0,
-    ]);
+    final saturationMatrix = <double>[
+      sR_R, sR_G, sR_B, 0, 0,
+      sG_R, sG_G, sG_B, 0, 0,
+      sB_R, sB_G, sB_B, 0, 0,
+      0,    0,    0,    1, 0,
+    ];
+
+    final brightnessMatrix = <double>[
+      1, 0, 0, 0, b,
+      0, 1, 0, 0, b,
+      0, 0, 1, 0, b,
+      0, 0, 0, 1, 0,
+    ];
+
+    final offset = 128.0 * (1.0 - c);
+    final contrastMatrix = <double>[
+      c, 0, 0, 0, offset,
+      0, c, 0, 0, offset,
+      0, 0, c, 0, offset,
+      0, 0, 0, 1, 0,
+    ];
+
+    // M_final = M_contrast * M_brightness * M_saturation
+    _cachedFilter = ColorFilter.matrix(
+        _multiply4x5(_multiply4x5(contrastMatrix, brightnessMatrix), saturationMatrix));
     return _cachedFilter!;
   }
 
@@ -302,7 +356,7 @@ class _ImageCanvasState extends State<ImageCanvas> {
 
         Widget imageContent = Builder(
           builder: (context) {
-            final hasFilter = _saturation != 1.0 || _contrast != 1.0;
+            final hasFilter = _saturation != 1.0 || _contrast != 1.0 || _brightness != 0.0;
             final image = _isFilled
                 ? SizedBox.expand(child: _buildImage())
                 : Center(child: _buildImage());