20 lines
763 B
Dart
20 lines
763 B
Dart
|
import 'dart:typed_data';
|
||
|
|
|
||
|
|
/// A pluggable local OCR backend.
|
||
|
|
///
|
||
|
|
/// Implementations turn a PNG image into recognized text. The app selects an
|
||
|
|
/// available backend via [OcrBackends]; absence of any backend is a clean
|
||
|
|
/// no-op (recognition returns null).
|
||
|
|
abstract class OcrBackend {
|
||
|
|
/// Short identifier used for logging/selection (e.g. 'native', 'onnx').
|
||
|
|
String get name;
|
||
|
|
|
||
|
|
/// Whether this backend can run on the current device/build. May perform a
|
||
|
|
/// lazy initialization attempt (e.g. loading a model) the first time.
|
||
|
|
Future<bool> isAvailable();
|
||
|
|
|
||
|
|
/// Recognize text from a PNG image. Returns null when nothing is recognized
|
||
|
|
/// or the backend is unavailable. Implementations must never throw.
|
||
|
|
Future<String?> recognize(Uint8List pngBytes);
|
||
|
|
}
|