ldd_bmp

Description:

ldd bmp

任意图像转 1 位深度的 bmp图像 #
初始化 #
await bmpSdkInit();
Future<void> main() async {
await bmpSdkInit();
runApp(const MyApp());
}
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转换 #
函数: convertTo1BitBmp

参数 1: 要转换的图片字节数据
参数 2: 图片的类型,LddImageType是一个枚举,
enum LddImageType {
png,
jpeg,
gif,
webP,
pnm,
tiff,
tga,
dds,
bmp,
ico,
hdr,
openExr,
farbfeld,
avif,
qoi,
;
}
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可选参数: resize: 对图像进行缩放
const reSize = ResizeOpt(
width: 200,//宽度
height: 200,//高度
filter: LddFilterType.nearest,//压缩算法
);
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可选参数: isApplyOrderedDithering: 是否使用 h4x4a 抖动算法

返回类型: 处理完成的字节数据Uint8List
完整的代码 #
import 'dart:io';
import 'dart:typed_data';

import 'package:file_picker/file_picker.dart';
import 'package:flutter/material.dart';
import 'package:ldd_bmp/api/entitys.dart';
import 'package:ldd_bmp/api/image.dart';
import 'package:ldd_bmp/ldd_bmp.dart';
import 'dart:async';

import 'package:path_provider/path_provider.dart';

const reSize = ResizeOpt(
width: 200,
height: 200,
filter: LddFilterType.nearest,
);

Future<void> main() async {
await bmpSdkInit();
runApp(const MyApp());
}

class MyApp extends StatefulWidget {
const MyApp({super.key});

@override
State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
File? file;
Uint8List? bmpData;
@override
void initState() {
super.initState();
}

@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('Native Packages'),
),
body: SingleChildScrollView(
child: Column(
children: [
FilledButton(onPressed: selectFile, child: const Text('选择文件')),
ElevatedButton(
onPressed: file == null
? null
: () async {
final bts = await file!.readAsBytes();
bmpData = await convertTo1BitBmp(
inputData: bts,
imageType: LddImageType.jpeg,
isApplyOrderedDithering: true,
resize: const ResizeOpt(
width: 200,
height: 200,
filter: LddFilterType.nearest,
));
setState(() {});
},
child: const Text("转换")),
ElevatedButton(
onPressed: bmpData == null
? null
: () {
saveImageToFile(bmpData!);
},
child: const Text("保存图片"))
],
),
),
floatingActionButton: bmpData != null
? ConstrainedBox(
constraints:
const BoxConstraints(maxHeight: 300, maxWidth: 300),
child: Card(
child: Image.memory(bmpData!),
),
)
: null,
),
);
}

Future<void> selectFile() async {
setState(() {
file = null;
});
FilePickerResult? result = await FilePicker.platform.pickFiles();
if (result != null) {
file = File(result.files.single.path!);
setState(() {});
} else {
// User canceled the picker
}
}
}

Future<void> saveImageToFile(Uint8List imageData) async {
// 获取应用程序的文档目录
final directory = await getApplicationDocumentsDirectory();

// 设置文件路径和文件名
final filePath = '${directory.path}/image.bmp';

// 创建一个文件对象
final file = File(filePath);

// 将Uint8List数据写入文件
await file.writeAsBytes(imageData);

print('Image saved to $filePath');
}

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