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flutter-side decode

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This commit is contained in:
mertalev
2026-01-17 23:46:46 -05:00
parent 24ff08e094
commit 00ea98479f
8 changed files with 106 additions and 123 deletions
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mobile/lib/infrastructure/loaders/image_request.dart
+43 -24
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@@ -1,6 +1,5 @@
import 'dart:async';
import 'dart:ffi';
import 'dart:io';
import 'dart:ui' as ui;
import 'package:flutter/material.dart';
@@ -35,35 +34,55 @@ abstract class ImageRequest {
void _onCancelled();
Future<ui.FrameInfo?> _fromPlatformImage(Map<String, int> info, {required bool shouldFree}) async {
final address = info['pointer'];
if (address == null) {
return null;
}
Future<ui.FrameInfo?> _fromEncodedPlatformImage(int address, int length) async {
final pointer = Pointer<Uint8>.fromAddress(address);
if (_isCancelled) {
if (shouldFree) {
malloc.free(pointer);
}
malloc.free(pointer);
return null;
}
final int actualWidth;
final int actualHeight;
final int rowBytes;
final int actualSize;
final ui.ImmutableBuffer buffer;
try {
actualWidth = info['width']!;
actualHeight = info['height']!;
rowBytes = info['rowBytes'] ?? actualWidth * 4;
actualSize = rowBytes * actualHeight;
buffer = await ImmutableBuffer.fromUint8List(pointer.asTypedList(actualSize));
buffer = await ImmutableBuffer.fromUint8List(pointer.asTypedList(length));
} finally {
if (shouldFree) {
malloc.free(pointer);
}
malloc.free(pointer);
}
if (_isCancelled) {
buffer.dispose();
return null;
}
final descriptor = await ui.ImageDescriptor.encoded(buffer);
if (_isCancelled) {
buffer.dispose();
descriptor.dispose();
return null;
}
final codec = await descriptor.instantiateCodec();
if (_isCancelled) {
buffer.dispose();
descriptor.dispose();
codec.dispose();
return null;
}
return await codec.getNextFrame();
}
Future<ui.FrameInfo?> _fromDecodedPlatformImage(int address, int width, int height, int rowBytes) async {
final pointer = Pointer<Uint8>.fromAddress(address);
if (_isCancelled) {
malloc.free(pointer);
return null;
}
final size = rowBytes * height;
final ui.ImmutableBuffer buffer;
try {
buffer = await ImmutableBuffer.fromUint8List(pointer.asTypedList(size));
} finally {
malloc.free(pointer);
}
if (_isCancelled) {
@@ -73,8 +92,8 @@ abstract class ImageRequest {
final descriptor = ui.ImageDescriptor.raw(
buffer,
width: actualWidth,
height: actualHeight,
width: width,
height: height,
rowBytes: rowBytes,
pixelFormat: ui.PixelFormat.rgba8888,
);