I'm getting this error on an application which is scanning multiple QR codes over long periods

Failed to read QR code. Finished up all reserved function pointers. Use a higher value for RESERVED_FUNCTION_POINTERS.

@schmich could you please recompile the script with more pointers as described [here](https://kripken.github.io/emscripten-site/docs/porting/connecting_cpp_and_javascript/Interacti

It would be very nice if you could implement functions to check if flashlight is enabled or not, currently we can only set it to enabled or disabled.

1. 代码是这样的：<img src="http://img-1255379270.cosbj.myqcloud.com/website/iconWeb/phone-1.png" class="foot-img" style="height: 34px; width: 34px; background-color: rgb(17, 17, 17); vertical-align: middle; border-radius: 50px;">

2. 浏览器展示是圆图： http://test-1255379270.cosbj.myqcloud.com/Snipaste_2019-07-23_14-26-03.png

3. html 转图片生成的图片为：[http://test-1255379270.cosbj.myqcloud.com/Snipaste_201

clang-6 prints these warnings that seem important:

/usr/ports/textproc/zxing-cpp/work/zxing-cpp-e0e40dd/cli/src/jpgd.cpp:568:170: warning: shifting a negative signed value is undefined [-Wshift-negative-value]
static const int s_extend_offset[16] = { 0, ((-1)<<1) + 1, ((-1)<<2) + 1, ((-1)<<3) + 1, ((-1)<<4) + 1, ((-1)<<5) + 1, ((-1)<<6) + 1, ((-1)<<7) + 1, ((-1)<<8) + 1, ((-1)<<9) + 1, ((-1

The material design specs have added a section on the barcode scanning experience. It would be great if the UX could be recreated by this library.

See https://material.io/collections/machine-learning/barcode-scanning.html

My angular cli version details
Angular CLI: 6.2.9
Node: 8.9.1
OS: win32 x64.

On installing the package and including

// Common imports
import { NgModule /* , ... */ } from '@angular/core';

// Import the package's module
import { ZXingScannerModule } from '@zxing/ngx-scanner';

@NgModule({
declarations: [ /* AppComponent ... */ ],
imports: [

    // BrowserModule,

Hello, I'm Harry. I engage in content creation for open source software. I mostly just create documents which I think would be valuable to the project. I'd like to contribute to yours by creating a contributor's guidelines, and make your privacy policy statement more formal. What do you think?

With reference to the example of reading qr code from image

I tried to pass the sample qr code image path to
`const codeReader = new ZXing.BrowserQRCodeReader()
codeReader.decodeFromImage('./assets/images/sample.png').then((result) => {
console.log(result)
// document.getElementById('resu