47 lines
1.6 KiB
Dart
47 lines
1.6 KiB
Dart
import 'dart:typed_data';
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import 'package:image/image.dart' as img;
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/// 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）。
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/// 即喂给 YOLO 推理的同一帧，尺寸与推理输入同源。
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class FrameSnapshot {
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final Uint8List plane;
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final int bytesPerRow;
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final int width;
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final int height;
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/// true = BGRA 字节序（Android 原生通道默认 / iOS bgra8888），false = RGBA
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final bool bgra;
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const FrameSnapshot({
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required this.plane,
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required this.bytesPerRow,
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required this.width,
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required this.height,
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required this.bgra,
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});
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}
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/// 在 isolate 执行：整帧像素行拷贝 → 解码为 Image → jpg q85 重编码。
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/// 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）
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Uint8List encodeFrameJpeg(FrameSnapshot snap) {
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final packed = Uint8List(snap.width * snap.height * 4);
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for (var y = 0; y < snap.height; y++) {
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final srcStart = y * snap.bytesPerRow;
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final dstStart = y * snap.width * 4;
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packed.setRange(dstStart, dstStart + snap.width * 4,
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snap.plane.sublist(srcStart, srcStart + snap.width * 4));
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}
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final image = img.Image.fromBytes(
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width: snap.width,
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height: snap.height,
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bytes: packed.buffer,
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numChannels: 4,
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order: snap.bgra ? img.ChannelOrder.bgra : img.ChannelOrder.rgba,
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);
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return Uint8List.fromList(img.encodeJpg(image, quality: 85));
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}
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/// 单独同意弹窗结果存储 key（FlutterSecureStorage，与 terms_accepted 同库）
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const falseTargetConsentKey = 'false_target_consent';
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