A pure JavaScript QRCode encode and decode library.

nuintun

Last update: Nov 28, 2022

Overview

QRCode

A pure JavaScript QRCode encode and decode library.

QRCode guide and demo

QRCode guide

QRCode example

QRCode example use worker

Modify from kazuhikoarase/qrcode-generator and cozmo/jsQR

Usage

Encoder

import { Encoder, QRByte, QRKanji, ErrorCorrectionLevel } from '@nuintun/qrcode';

const qrcode = new Encoder();

qrcode.setEncodingHint(true);
qrcode.setErrorCorrectionLevel(ErrorCorrectionLevel.H);

qrcode.write('你好世界\n');
qrcode.write(new QRByte('hello world\n'));
qrcode.write(new QRKanji('こんにちは世界'));

qrcode.make();

console.log(qrcode.toDataURL());

Constructor

new Encoder(options?: Options): Encoder
- version?: number;
- encodingHint?: boolean;
- errorCorrectionLevel?: ErrorCorrectionLevel;

Methods

getMatrix(): boolean[][]
- Get qrcode modules matrix.
getMatrixSize(): number
- Get qrcode modules matrix size.
setVersion(version: number): Encoder
- Set qrcode version, if set 0 the version will be set automatically.
getVersion(): number
- Get qrcode version.
setErrorCorrectionLevel(errorCorrectionLevel: ErrorCorrectionLevel): Encoder
- Set qrcode error correction level.
getErrorCorrectionLevel(): ErrorCorrectionLevel
- Get qrcode error correction level.
setEncodingHint(encodingHint: boolean): Encoder
- Set qrcode encoding hint, it will add ECI in qrcode.
getEncodingHint(): boolean
- Get qrcode encoding hint.
write(data: string | QRByte | QRKanji | QRNumeric | QRAlphanumeric): Encoder
- Add qrcode data, if string will use QRByte by default.
isDark(row: number, col: number): boolean
- Get byte with row and col.
make(): Encoder
- Make qrcode matrix.
toDataURL(moduleSize?: number, margin?: number): string
- Output qrcode base64 gif image.
clear(): void
- Clear written data.

Custom ECI

import { Encoder, QRByte } from '@nuintun/qrcode';

const qrcode = new Encoder();

qrcode.setEncodingHint(true);

// Custom your own encode function return bytes and encoding
// The encoding value must a valid ECI value
// Custom ECI only support QRByte mode
// https://github.com/zxing/zxing/blob/master/core/src/main/java/com/google/zxing/common/CharacterSetECI.java
qrcode.write(
  new QRByte('hello world', data => ({
    encoding: 26,
    bytes: [104, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100]
  }))
);

qrcode.make();

console.log(qrcode.toDataURL());

Decoder

import { Decoder } from '@nuintun/qrcode';

const qrcode = new Decoder();

qrcode
  .scan('https://nuintun.github.io/qrcode/examples/qrcode.jpg')
  .then(result => {
    console.log(result.data);
  })
  .catch(error => {
    console.error(error);
  });

Constructor

new Decoder(options?: Options): Decoder
- canOverwriteImage?: boolean
- inversionAttempts?: 'dontInvert' | 'onlyInvert' | 'attemptBoth' | 'invertFirst'
- greyScaleWeights?: { red: number, green: number, blue: number, useIntegerApproximation?: boolean }

Methods

setOptions(options: Options): Decoder
- Set decode options.
  - canOverwriteImage?: boolean
  - inversionAttempts?: 'dontInvert' | 'onlyInvert' | 'attemptBoth' | 'invertFirst'
  - greyScaleWeights?: { red: number, green: number, blue: number, useIntegerApproximation?: boolean }
scan(src: string): Promise<DecoderResult>
- Decode a qrcode from image src.
- Notice: support browser environment only.
decode(data: Uint8ClampedArray, width: number, height: number): DecoderResult
- Decode a qrcode from image data.

Comments

在小程序里用了这个qrcode.decode(result.data, 100, 100)方法报错

报错如图：希望看到这个问题能尽快解决下，谢谢

用的是mpvue框架源码如下

<template>
  <div class="imglist">
    <div class="uploadimg">
      <img class="invoice" src="/static/images/advertisementpic.jpg" alt=""/>
      <div class="mask">
        <span class="context">校验状态</span>
      </div>
       <!-- 上传成功添加删除按钮 -->
      <img  class="icon-delete" src="../../static/images/icon/[email protected]"/>
    </div>
    <div class="uploadimg" @click="chooseImage">
      <img class="icon-upload default" src='../../static/images/icon/[email protected]'/>
    </div>
  </div>
</template>
<script>
import { mapState, mapMutations } from "vuex";
import { ajaxGet, ajaxPost } from "../http/api";
import { randomWord } from "../common/js/utils";
import { Decoder } from '@nuintun/qrcode';
import config from "../config";
const qrcode = new Decoder();
export default {
  props: {
    iconurl: ""
  },
  data() {
    return {
      list:[]
    };
  },
  watch: {
    //     uploadurlpro:{
    // 　　　　handler(newValue, oldValue) {
    //         this.uploadurl = newValue;
    //       },
    //       deep:true
    //     }
  },
  computed: {
    ...mapState(["role", "uid", "access_token"])
  },
  mounted() {
    
      
    // qrcode.decode('https://static-www.putaocdn.com/pc/static/img/img_service_wechat_qrcode.v201905081514.png');
    //       qrcode.callback = function (imgMsg) {
    //           alert("二维码解析：" + imgMsg)
    //       }
    // Object.assign(this.$data, this.$options.data())
  },
  methods: {
    chooseImage(e) {
      let self = this;
      wx.chooseImage({
        sizeType: ["compressed"], // 可以指定是原图还是压缩图，默认二者都有
        sourceType: ["album", "camera"], // 可以指定来源是相册还是相机，默认二者都有
        success(res) {
          console.log(res);
          const FileSystemManager = wx.getFileSystemManager()
              FileSystemManager.readFile({
                filePath: res.tempFilePaths[0],
                success(result){
                  console.log(result)
                  let DecoderResult = qrcode.decode(result.data, 100, 100)
                  console.log(DecoderResult);
                }
              })
              
          
        },
        fail(error) {
          console.log(error);
          if (error.errMsg !== "chooseImage:fail cancel") {
          }
        }
      });
    },
    uploadimg(){

    },
    // 删除图片
    deleteimg(e) {
      // this.uploadurl = "";
      // this.$emit("changeurl", this.uploadurl);
    }
  }
};
</script>
<style lang="scss" scoped>
@function rpx($value) {
  @return $value * 2rpx;
}
.imglist {
  display: flex;
  align-content: center;
  align-items: center;
  flex-wrap: wrap;
  margin-top: rpx(10);
  .uploadimg {
    width: rpx(64);
    height: rpx(64);
    background-color: #ebebeb;
    border-radius: rpx(4);
    position: relative;
    margin-right: rpx(18);
    margin-bottom:rpx(10);
    .mask {
      position: absolute;
      width: 100%;
      height: 100%;
      top:0px;
      left: 0px;
      z-index: 3;
      border-radius: rpx(4);
      background: rgba(0,0,0,0.50);
      text-align: center;
      line-height:rpx(64);
      .context {
        font-size: rpx(12);
        color: #FFFFFF;
      }
    }
    .icon-upload {
      position: absolute;
      top: 0;
      bottom: 0;
      left: 0;
      right: 0;
      z-index: 1;
      margin: auto;
      max-width: rpx(64);
      max-height: rpx(64);
      min-width: rpx(24);
      min-height: rpx(24);
      &.default {
        width: rpx(24);
        height: rpx(24);
      }
    }
    .icon-delete {
      position: absolute;
      bottom: 0;
      right: 0;
      z-index: 4;
      width: rpx(16);
      height: rpx(16);
    }
    .invoice {
      position: absolute;
      top: 0;
      left: 0;
      z-index: 2;
      width: rpx(64);
      height: rpx(64);
    }
  }
}
</style>

opened by luodanyalian 3

PNGImage

/**
 * @module PNGImage
 * @see https://github.com/wheany/js-png-encoder
 */

const MOD_ADLER: number = 65521;
const MAX_STORE_LENGTH: number = 65535;
const NO_FILTER: string = String.fromCharCode(0);
const DEFLATE_METHOD: string = String.fromCharCode(0x78, 0x01);
const SIGNATURE: string = String.fromCharCode(137, 80, 78, 71, 13, 10, 26, 10);

function makeCRCTable(): number[] {
  const table: number[] = [];

  for (let n = 0; n < 256; n++) {
    let c = n;

    for (let k = 0; k < 8; k++) {
      if (c & 1) {
        c = 0xedb88320 ^ (c >>> 1);
      } else {
        c = c >>> 1;
      }
    }

    table[n] = c;
  }

  return table;
}

function inflateStore(data: string): string {
  let storeBuffer: string = '';
  const length: number = data.length;

  for (let i = 0; i < length; i += MAX_STORE_LENGTH) {
    let blockType: string = '';
    let remaining: number = length - i;

    if (remaining <= MAX_STORE_LENGTH) {
      blockType = String.fromCharCode(0x01);
    } else {
      remaining = MAX_STORE_LENGTH;
      blockType = String.fromCharCode(0x00);
    }

    // Little endian
    storeBuffer += blockType + String.fromCharCode(remaining & 0xff, (remaining & 0xff00) >>> 8);
    storeBuffer += String.fromCharCode(~remaining & 0xff, (~remaining & 0xff00) >>> 8);

    storeBuffer += data.substring(i, i + remaining);
  }

  return storeBuffer;
}

function adler32(data: string): number {
  let a: number = 1;
  let b: number = 0;

  for (let i = 0; i < data.length; i++) {
    a = (a + data.charCodeAt(i)) % MOD_ADLER;
    b = (b + a) % MOD_ADLER;
  }

  return (b << 16) | a;
}

function updateCRC(crc: number, buf: string) {
  let c: number = crc;

  for (let n = 0; n < buf.length; n++) {
    const b: number = buf.charCodeAt(n);

    c = CRC_TABLE[(c ^ b) & 0xff] ^ (c >>> 8);
  }

  return c;
}

function getCRC(buf: string): number {
  return updateCRC(0xffffffff, buf) ^ 0xffffffff;
}

function dwordAsString(dword: number): string {
  return String.fromCharCode(
    (dword & 0xff000000) >>> 24,
    (dword & 0x00ff0000) >>> 16,
    (dword & 0x0000ff00) >>> 8,
    dword & 0x000000ff
  );
}

function createChunk(length: number, type: string, data: string): string {
  const CRC: number = getCRC(type + data);

  return dwordAsString(length) + type + data + dwordAsString(CRC);
}

function createIHDR(width: number, height: number) {
  let IHDRdata: string = dwordAsString(width) + dwordAsString(height);

  // Bit depth
  IHDRdata += String.fromCharCode(8);
  // Color type: 6=truecolor with alpha
  IHDRdata += String.fromCharCode(6);
  // Compression method: 0=deflate, only allowed value
  IHDRdata += String.fromCharCode(0);
  // Filtering: 0=adaptive, only allowed value
  IHDRdata += String.fromCharCode(0);
  // Interlacing: 0=none
  IHDRdata += String.fromCharCode(0);

  return createChunk(13, 'IHDR', IHDRdata);
}

const CRC_TABLE: number[] = makeCRCTable();
const IEND: string = createChunk(0, 'IEND', '');

function png(width: number, height: number, rgba: number[]): string {
  let scanLine: string;
  let scanLines: string = '';
  const length: number = rgba.length;
  const IHDR: string = createIHDR(width, height);

  for (let y = 0; y < length; y += width * 4) {
    scanLine = NO_FILTER;

    for (let x = 0; x < width * 4; x++) {
      scanLine += String.fromCharCode(rgba[y + x] & 0xff);
    }

    scanLines += scanLine;
  }

  const compressedScanlines = DEFLATE_METHOD + inflateStore(scanLines) + dwordAsString(adler32(scanLines));
  const IDAT = createChunk(compressedScanlines.length, 'IDAT', compressedScanlines);

  return SIGNATURE + IHDR + IDAT + IEND;
}

export class PNGImage {
  public width: number;
  public height: number;

  private data: number[] = [];

  constructor(width: number, height: number) {
    this.width = width;
    this.height = height;
  }

  write(red: number, green: number, blue: number, alpha: number = 255): void {
    this.data.push(red, green, blue, alpha);
  }

  toDataURL() {
    return `data:image/png;base64,${btoa(png(this.width, this.height, this.data))}`;
  }
}

opened by nuintun 2

⬆️ Bump typescript from 4.5.4 to 4.5.5
Bumps typescript from 4.5.4 to 4.5.5.

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dependencies
opened by dependabot[bot] 1
⬆️ Bump @types/node from 16.11.11 to 17.0.10
Bumps @types/node from 16.11.11 to 17.0.10.

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dependencies
opened by dependabot[bot] 1
⬆️ Bump @types/node from 16.11.11 to 17.0.9
Bumps @types/node from 16.11.11 to 17.0.9.

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dependencies
opened by dependabot[bot] 1
⬆️ Bump rollup from 2.60.2 to 2.64.0
Bumps rollup from 2.60.2 to 2.64.0.

Release notes

Sourced from rollup's releases.

v2.64.0

2022-01-14

Features

Allow inspecting cached modules and forcing them to be transformed again via shouldTransformCachedModule (#4320)

Do not wait for the config file to be parsed in watch mode if it is updated before that (#4344)

Bug Fixes

Do not mutate objects returned as meta from the resolveId hook (#4347)

Pull Requests

#4326: refactor: type fixes (@dnalborczyk)

#4339: More watch test stabilization (@lukastaegert)

#4340: refactor: performance timers for node.js and browser (@dnalborczyk)

#4341: Implement shouldTransformCachedModule hook (@lukastaegert)

#4344: Directly restart Rollup when config file change is detected in watch mode (@lukastaegert)

#4347: Create a shallow copy when returning meta from resolveId (@lukastaegert)

v2.63.0

2022-01-04

Features

Report a helpful error if rollup exits due to an empty event loop when using this.load (#4320)

Allow directly mutating ModuleInfo.meta for modules and never replace this object (#4328)

Detect additional side effect free array prototype methods (#4332)

Bug Fixes

Do not watch if CLI watch options are specified but --watch is missing (#4335)

Pull Requests

#4320: Detect unfulfilled async hook actions and report error on exit (@kzc)

#4328: Make initial ModuleInfo.meta mutable and maintain object identity (@lukastaegert)

#4318: Stabilize watch tests (@lukastaegert)

#4331: Improve JS docs example (@lukastaegert)

#4332: add support for Array.prototype.findLast,findLastIndex (@dnalborczyk)

#4333: convert utils.transform to async function (@dnalborczyk)

#4335: Do not watch unless --watch is specified explicitly (@lukastaegert)

#4338: Add build delay for plugin event test (@lukastaegert)

v2.62.0

2021-12-24

Features

... (truncated)

Changelog

Sourced from rollup's changelog.

2.64.0

2022-01-14

Features

Allow inspecting cached modules and forcing them to be transformed again via shouldTransformCachedModule (#4320)

Do not wait for the config file to be parsed in watch mode if it is updated before that (#4344)

Bug Fixes

Do not mutate objects returned as meta from the resolveId hook (#4347)

Pull Requests

#4326: refactor: type fixes (@dnalborczyk)

#4339: More watch test stabilization (@lukastaegert)

#4340: refactor: performance timers for node.js and browser (@dnalborczyk)

#4341: Implement shouldTransformCachedModule hook (@lukastaegert)

#4344: Directly restart Rollup when config file change is detected in watch mode (@lukastaegert)

#4347: Create a shallow copy when returning meta from resolveId (@lukastaegert)

2.63.0

2022-01-04

Features

Report a helpful error if rollup exits due to an empty event loop when using this.load (#4320)

Allow directly mutating ModuleInfo.meta for modules and never replace this object (#4328)

Detect additional side effect free array prototype methods (#4332)

Bug Fixes

Do not watch if CLI watch options are specified but --watch is missing (#4335)

Pull Requests

#4320: Detect unfulfilled async hook actions and report error on exit (@kzc)

#4328: Make initial ModuleInfo.meta mutable and maintain object identity (@lukastaegert)

#4318: Stabilize watch tests (@lukastaegert)

#4331: Improve JS docs example (@lukastaegert)

#4332: add support for Array.prototype.findLast,findLastIndex (@dnalborczyk)

#4333: convert utils.transform to async function (@dnalborczyk)

#4335: Do not watch unless --watch is specified explicitly (@lukastaegert)

#4338: Add build delay for plugin event test (@lukastaegert)

2.62.0

2021-12-24

... (truncated)

Commits

82a3e26 2.64.0

b1205b8 Update changelog

7c47283 refactor: performance timers for node.js and browser (#4340)

edca64e Directly restart Rollup when config file change is detected in watch mode (#4...

9e947fc Create a shallow copy when returning meta from resolveId (#4347)

1d2ea22 Implement shouldTransformCachedModule hook (#4341)

da3bb43 More watch test stabilization (#4339)

205e861 refactor: type fixes (#4326)

ae674c9 2.63.0

27196a0 Update changelog

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dependencies
opened by dependabot[bot] 1
⬆️ Bump @rollup/plugin-node-resolve from 13.0.6 to 13.1.3
Bumps @rollup/plugin-node-resolve from 13.0.6 to 13.1.3.

Changelog

Sourced from @rollup/plugin-node-resolve's changelog.

v13.1.3

2022-01-05

Bugfixes

fix: use correct version when published (#1063)

v13.1.2

2021-12-31

Bugfixes

fix: forward meta-information from other plugins (#1062)

v13.1.1

2021-12-13

Updates

test: add tests for mixing custom exportConditions with browser: true (#1043)

v13.1.0

2021-12-13

Features

feat: expose plugin version (#1050)

Commits

13dca1d chore(release): node-resolve v13.1.3

d2c788c fix(node-resolve): use correct version when published (#1063)

f86db9b chore(release): node-resolve v13.1.2

23226cd fix(node-resolve): forward meta-information from other plugins (#1062)

8c6ae32 chore(release): node-resolve v13.1.1

9e6db2d test(node-resolve): add tests for mixing custom exportConditions with `brow...

e7719b0 chore(release): node-resolve v13.1.0

59add60 feat(node-resolve): expose plugin version (#1050)

932f54c chore(release): node-resolve v13.0.6

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dependencies
opened by dependabot[bot] 1
⬆️ Bump @types/node from 16.11.11 to 17.0.8
Bumps @types/node from 16.11.11 to 17.0.8.

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dependencies
opened by dependabot[bot] 1
⬆️ Bump rollup from 2.60.2 to 2.63.0
Bumps rollup from 2.60.2 to 2.63.0.

Release notes

Sourced from rollup's releases.

v2.63.0

2022-01-04

Features

Report a helpful error if rollup exits due to an empty event loop when using this.load (#4320)

Allow directly mutating ModuleInfo.meta for modules and never replace this object (#4328)

Detect additional side effect free array prototype methods (#4332)

Bug Fixes

Do not watch if CLI watch options are specified but --watch is missing (#4335)

Pull Requests

#4320: Detect unfulfilled async hook actions and report error on exit (@kzc)

#4328: Make initial ModuleInfo.meta mutable and maintain object identity (@lukastaegert)

#4318: Stabilize watch tests (@lukastaegert)

#4331: Improve JS docs example (@lukastaegert)

#4332: add support for Array.prototype.findLast,findLastIndex (@dnalborczyk)

#4333: convert utils.transform to async function (@dnalborczyk)

#4335: Do not watch unless --watch is specified explicitly (@lukastaegert)

#4338: Add build delay for plugin event test (@lukastaegert)

v2.62.0

2021-12-24

Features

Mark additional string prototype methods as side-effect-free and correct typings of existing ones (#4299)

Mark additional array prototype methods as side-effect-free and correct typings of existing ones (#4309)

Expose if a module is included after tree-shaking in its ModuleInfo (#4305)

Bug Fixes

Fix how fsevents is included to improve watch mode on MacOS (#4312)

Pull Requests

#4299: Add additional string prototype methods (@dnalborczyk)

#4300: Bump deps, fix expected test result for core-js (@dnalborczyk)

#4302: Replace type assertion with type guard (@dnalborczyk)

#4304: Re-use reserved names set (@dnalborczyk)

#4305: Expose isIncluded in module info (@william57m)

#4306: Fix git line breaks on windows (@dnalborczyk)

#4307: Add macos to pipeline (@dnalborczyk)

#4309: Add additional array prototype methods (@dnalborczyk)

#4311: Add Deno instructions to docs (@jespertheend)

#4312: fsevents integration (@dnalborczyk)

#4313: Remove non-existing static functions from known globals (@dnalborczyk)

... (truncated)

Changelog

Sourced from rollup's changelog.

2.63.0

2022-01-04

Features

Report a helpful error if rollup exits due to an empty event loop when using this.load (#4320)

Allow directly mutating ModuleInfo.meta for modules and never replace this object (#4328)

Detect additional side effect free array prototype methods (#4332)

Bug Fixes

Do not watch if CLI watch options are specified but --watch is missing (#4335)

Pull Requests

#4320: Detect unfulfilled async hook actions and report error on exit (@kzc)

#4328: Make initial ModuleInfo.meta mutable and maintain object identity (@lukastaegert)

#4318: Stabilize watch tests (@lukastaegert)

#4331: Improve JS docs example (@lukastaegert)

#4332: add support for Array.prototype.findLast,findLastIndex (@dnalborczyk)

#4333: convert utils.transform to async function (@dnalborczyk)

#4335: Do not watch unless --watch is specified explicitly (@lukastaegert)

#4338: Add build delay for plugin event test (@lukastaegert)

2.62.0

2021-12-24

Features

Mark additional string prototype methods as side-effect-free and correct typings of existing ones (#4299)

Mark additional array prototype methods as side-effect-free and correct typings of existing ones (#4309)

Expose if a module is included after tree-shaking in its ModuleInfo (#4305)

Bug Fixes

Fix how fsevents is included to improve watch mode on MacOS (#4312)

Pull Requests

#4299: Add additional string prototype methods (@dnalborczyk)

#4300: Bump deps, fix expected test result for core-js (@dnalborczyk)

#4302: Replace type assertion with type guard (@dnalborczyk)

#4304: Re-use reserved names set (@dnalborczyk)

#4305: Expose isIncluded in module info (@william57m)

#4306: Fix git line breaks on windows (@dnalborczyk)

#4307: Add macos to pipeline (@dnalborczyk)

#4309: Add additional array prototype methods (@dnalborczyk)

#4311: Add Deno instructions to docs (@jespertheend)

... (truncated)

Commits

ae674c9 2.63.0

27196a0 Update changelog

cf53733 Add build delay for plugin event test (#4338)

0ceee1d Detect unfulfilled async hook actions and report error on exit (#4320)

2fea0d7 Make initial ModuleInfo.meta mutable and maintain object identity (#4328)

a54b798 Improve JS docs example (#4331)

342ba2c feat: add support for Array.prototype.findLast,findLastIndex (#4332)

3943111 refactor: convert utils.transform to async function (#4333)

ba7fc53 Do not watch unless --watch is specified explicitly (#4335)

7f55571 Stabilize watch tests (#4318)

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dependencies
opened by dependabot[bot] 1
⬆️ Bump @types/node from 16.11.11 to 17.0.7
Bumps @types/node from 16.11.11 to 17.0.7.

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dependencies
opened by dependabot[bot] 1
⬆️ Bump @rollup/plugin-node-resolve from 13.0.6 to 13.1.2
Bumps @rollup/plugin-node-resolve from 13.0.6 to 13.1.2.

Changelog

Sourced from @rollup/plugin-node-resolve's changelog.

v13.1.2

2021-12-31

Bugfixes

fix: forward meta-information from other plugins (#1062)

v13.1.1

2021-12-13

Updates

test: add tests for mixing custom exportConditions with browser: true (#1043)

v13.1.0

2021-12-13

Features

feat: expose plugin version (#1050)

Commits

6987caf chore(release): node-resolve v13.1.2

23226cd fix(node-resolve): forward meta-information from other plugins (#1062)

8c6ae32 chore(release): node-resolve v13.1.1

9e6db2d test(node-resolve): add tests for mixing custom exportConditions with `brow...

e7719b0 chore(release): node-resolve v13.1.0

59add60 feat(node-resolve): expose plugin version (#1050)

932f54c chore(release): node-resolve v13.0.6

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dependencies
opened by dependabot[bot] 1
Make sure to always return null on Decoder's `readVersion()`
In some cases, the decoder would find a section that looks like a QR Code, but it's smaller than 21x21, causing the version number calculation in readVersion() to go below zero and making the function return undefined. Because down the line there is a check for null, but not undefined, this causes the decoder to crash on buildFunctionPatternMask(). I found this to be more common on particularily grainy images like the ones from a notebook webcam.

The fix is a simple nullish coalescence to always return null and have the decoder correctly report that there is no valid QR Code in the region scanned. I also checked no other paths of this function could return anything other than a valid Version object or null.

Stracktrace:

qrcode.js:4459 Uncaught TypeError: Cannot read properties of undefined (reading 'versionNumber') at buildFunctionPatternMask (qrcode.js:4459:38) at readCodewords (qrcode.js:4485:31) at decodeMatrix (qrcode.js:4668:21) at decode (qrcode.js:4696:18) at scan (qrcode.js:4887:21) at Decoder.decode (qrcode.js:4945:20)

Note the library was transpiled in my case so line numbers are different.
opened by netux 0
Provide scalable image format

Hi, I have a question about how to fit the generated qrcode into my HTML. Currently, the generated qrcode is a GIF image which is not scalable. And I don't know how to set moduleSize to fit the desired size. So, could you please provide an option to export SVG or to draw a Canvas automatically?

opened by FantasqueX 0
Bug report

Please correct to avoid error when qrcode not recognized. function decodeMatrix(matrix) { var version = readVersion(matrix); if (!version) { /*version===null*/ return null; }

opened by lollita 0
[Feature Request] Support for Micro QR Codes

I am requesting support for the Micro QR format. Despite adoption of the format being low, I would love to use this repository in a project involving Micro QR codes and being able to decode them on the fly without a single, separate Android app that seems to be the only supporter of the format. I have tested multiple other JS-based QR Code decoders, none support Micro QRs. I have also tested a Windows only program based on the ZXing project with experimental support for Micro QRs, but it does not work well at all, only decoding a clear, crisp PNG of a Micro QR, not one "in the field" so to speak.

Thank you!

opened by wagwan-piffting-blud 0

fix(decoder): failed to decode image

@nuintun+qrcode+3.0.1.patch

diff --git a/node_modules/@nuintun/qrcode/esnext/qrcode/decoder/Reader.js b/node_modules/@nuintun/qrcode/esnext/qrcode/decoder/Reader.js
index 9ed2864..2f3a198 100644
--- a/node_modules/@nuintun/qrcode/esnext/qrcode/decoder/Reader.js
+++ b/node_modules/@nuintun/qrcode/esnext/qrcode/decoder/Reader.js
@@ -99,13 +99,15 @@ var Decoder = /*#__PURE__*/ (function () {
                 disposeImageEvents(image);
                 var width = image.width;
                 var height = image.height;
+                var actualWidth = Math.min(960, width);
+                var actualHeight = height * (actualWidth / width);
                 var canvas = document.createElement('canvas');
                 var context = canvas.getContext('2d');
-                canvas.width = width;
-                canvas.height = height;
-                context.drawImage(image, 0, 0);
-                var data = context.getImageData(0, 0, width, height).data;
-                var result = _this.decode(data, width, height);
+                canvas.width = actualWidth;
+                canvas.height = actualHeight;
+                context.drawImage(image, 0, 0, width, height, 0, 0, actualWidth, actualHeight);
+                var imageData = context.getImageData(0, 0, actualWidth, actualHeight);
+                var result = _this.decode(imageData.data, imageData.width, imageData.height);
                 if (result) {
                     return resolve(result);
                 }

opened by u3u 0

Releases(3.3.0)

3.3.0(May 9, 2022)
Use es6 module by default, but also support common module.

Source code(tar.gz)
Source code(zip)
3.0.1(Aug 12, 2020)
:bug: Fixed scan error to standard error

Source code(tar.gz)
Source code(zip)
3.0.0(Aug 10, 2020)
💥 Breaking Changes

[All]: Change string error to standard error.

[Decoder]: Merge ECI chunk into QRByte chunk.

Source code(tar.gz)
Source code(zip)
2.1.1(Jun 16, 2020)
📝 Fixed docs spell

✨ Add fallback locator point recenter

Source code(tar.gz)
Source code(zip)
2.0.1(Apr 13, 2020)
🎨 Rename private property

Source code(tar.gz)
Source code(zip)
2.0.0(Apr 13, 2020)
💥 Rename method

💥 Rename getModules to getMatrix

💥 Rename getModuleCount to getMatrixSize

Source code(tar.gz)
Source code(zip)
1.0.5(Apr 13, 2020)
⬆️ Bump deps

Source code(tar.gz)
Source code(zip)
1.0.4(Mar 2, 2020)
⬆️ Bump deps

Source code(tar.gz)
Source code(zip)
1.0.3(Dec 17, 2019)
⬆️ Change dev deps

🎨 Add bundle banner

Source code(tar.gz)
Source code(zip)
1.0.2(Dec 10, 2019)
⬆️ Bump deps

⚡️ Simplify build tools

Source code(tar.gz)
Source code(zip)
1.0.1(Nov 19, 2019)
🐛 Fix "onlyInvert" inversionAttempts option

Source code(tar.gz)
Source code(zip)
0.36.3(Aug 14, 2019)
⬆️ Bump deps

Source code(tar.gz)
Source code(zip)
0.36.2(Aug 2, 2019)
⬆️ Bump deps

📝 Update docs

Source code(tar.gz)
Source code(zip)
0.36.1(Jul 12, 2019)

⬆️ Bump deps
Source code(tar.gz)
Source code(zip)
0.35.0(Jun 6, 2019)
Version 0.35.0

:arrow_up: Bump deps

:sparkles: Add side effect free

Source code(tar.gz)
Source code(zip)
0.34.0(May 22, 2019)
Version 0.34.0

:sparkles: Decoder options support canOverwriteImage and greyScaleWeights

Source code(tar.gz)
Source code(zip)
0.33.0(May 17, 2019)

Version 0.31.0
Source code(tar.gz)
Source code(zip)
0.31.0(May 16, 2019)
Version 0.31.0

⬆️ Bump deps

Source code(tar.gz)
Source code(zip)
0.30.3(May 15, 2019)
Version 0.30.3

:pencil: Update docs

Source code(tar.gz)
Source code(zip)
0.30.2(May 13, 2019)

Version 0.30.1
Source code(tar.gz)
Source code(zip)
0.30.1(May 12, 2019)
Version 0.30.1

Bump deps and fixed docs

Source code(tar.gz)
Source code(zip)
0.30.0(May 10, 2019)

Version 0.30.0
Source code(tar.gz)
Source code(zip)
0.21.0(May 8, 2019)
Version 0.21.0

Fixed typescript Tree-shaking

Source code(tar.gz)
Source code(zip)
0.20.0(May 6, 2019)
Version 0.20.0

Breaking

Change decode result property name

Source code(tar.gz)
Source code(zip)
0.19.0(May 6, 2019)

Version 0.19.0
Source code(tar.gz)
Source code(zip)
0.18.3(May 5, 2019)

Version 0.18.3
Source code(tar.gz)
Source code(zip)
0.18.0(May 5, 2019)

Version 0.18.0
Source code(tar.gz)
Source code(zip)