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2026-09-08 22:29:00 +08:00
parent daf47ca385
commit e519e1d71d
23 changed files with 1261 additions and 6 deletions
@@ -0,0 +1,46 @@
+import 'dart:typed_data';
+
+import 'package:image/image.dart' as img;
+
+/// 按一次快照帧：单平面 BGRA/RGBA 像素（两平台分析帧均为竖屏单平面 4 通道）。
+/// 即喂给 YOLO 推理的同一帧，尺寸与推理输入同源。
+class FrameSnapshot {
+  final Uint8List plane;
+  final int bytesPerRow;
+  final int width;
+  final int height;
+
+  /// true = BGRA 字节序（Android 原生通道默认 / iOS bgra8888），false = RGBA
+  final bool bgra;
+
+  const FrameSnapshot({
+    required this.plane,
+    required this.bytesPerRow,
+    required this.width,
+    required this.height,
+    required this.bgra,
+  });
+}
+
+/// 在 isolate 执行：整帧像素行拷贝 → 解码为 Image → jpg q85 重编码。
+/// 与推理帧同源同尺寸、重编码天然剥离全部元数据（合规硬要求）
+Uint8List encodeFrameJpeg(FrameSnapshot snap) {
+  final packed = Uint8List(snap.width * snap.height * 4);
+  for (var y = 0; y < snap.height; y++) {
+    final srcStart = y * snap.bytesPerRow;
+    final dstStart = y * snap.width * 4;
+    packed.setRange(dstStart, dstStart + snap.width * 4,
+        snap.plane.sublist(srcStart, srcStart + snap.width * 4));
+  }
+  final image = img.Image.fromBytes(
+    width: snap.width,
+    height: snap.height,
+    bytes: packed.buffer,
+    numChannels: 4,
+    order: snap.bgra ? img.ChannelOrder.bgra : img.ChannelOrder.rgba,
+  );
+  return Uint8List.fromList(img.encodeJpg(image, quality: 85));
+}
+
+/// 单独同意弹窗结果存储 key（FlutterSecureStorage，与 terms_accepted 同库）
+const falseTargetConsentKey = 'false_target_consent';