feat: mobile editing

mobile/lib/utils/editor.utils.dart

@@ -0,0 +1,70 @@
+import 'dart:math';
+
+import 'package:flutter/widgets.dart';
+import 'package:immich_mobile/domain/models/asset_edit.model.dart';
+import 'package:immich_mobile/utils/matrix.utils.dart';
+import 'package:openapi/api.dart' hide AssetEditAction;
+
+Rect convertCropParametersToRect(CropParameters parameters, int originalWidth, int originalHeight) {
+  return Rect.fromLTWH(
+    parameters.x.toDouble() / originalWidth,
+    parameters.y.toDouble() / originalHeight,
+    parameters.width.toDouble() / originalWidth,
+    parameters.height.toDouble() / originalHeight,
+  );
+}
+
+CropParameters convertRectToCropParameters(Rect rect, int originalWidth, int originalHeight) {
+  final x = (rect.left * originalWidth).round();
+  final y = (rect.top * originalHeight).round();
+  final width = (rect.width * originalWidth).round();
+  final height = (rect.height * originalHeight).round();
+
+  return CropParameters(
+    x: max(x, 0).clamp(0, originalWidth),
+    y: max(y, 0).clamp(0, originalHeight),
+    width: max(width, 0).clamp(0, originalWidth - x),
+    height: max(height, 0).clamp(0, originalHeight - y),
+  );
+}
+
+AffineMatrix buildAffineFromEdits(List<AssetEdit> edits) {
+  return AffineMatrix.compose(
+    edits.map<AffineMatrix>((edit) {
+      switch (edit.action) {
+        case AssetEditAction.rotate:
+          final angleInDegrees = edit.parameters["angle"] as num;
+          final angleInRadians = angleInDegrees * pi / 180;
+          return AffineMatrix.rotate(angleInRadians);
+        case AssetEditAction.mirror:
+          final axis = edit.parameters["axis"] as String;
+          return axis == "horizontal" ? AffineMatrix.flipY() : AffineMatrix.flipX();
+        default:
+          return AffineMatrix.identity();
+      }
+    }).toList(),
+  );
+}
+
+bool isCloseToZero(double value, [double epsilon = 1e-15]) {
+  return value.abs() < epsilon;
+}
+
+typedef NormalizedTransform = ({double rotation, bool mirrorHorizontal, bool mirrorVertical});
+
+NormalizedTransform normalizeTransformEdits(List<AssetEdit> edits) {
+  final matrix = buildAffineFromEdits(edits);
+
+  double a = matrix.a;
+  double b = matrix.b;
+  double c = matrix.c;
+  double d = matrix.d;
+
+  final rotation = ((isCloseToZero(a) ? asin(c) : acos(a)) * 180) / pi;
+
+  return (
+    rotation: rotation < 0 ? 360 + rotation : rotation,
+    mirrorHorizontal: false,
+    mirrorVertical: isCloseToZero(a) ? b == c : a == -d,
+  );
+}