opencv4nodejs-prebuilt-install

!Tested
!Released
!Supported node versions
!Supported electron versions

$3

Cross-platform!

#### Supports

- Windows, Linux , MacOS
- node 18,20,21,22,23,24
- electron 23,24,25
- currently arh x64 (possible M1, arm64 and others if were available hosts with the type of processes)

How to install

`` bash
npm i opencv4nodejs-prebuilt-install
`

check supporting platforms and processes!

- prebuilt in node_modules/opencv4nodejs-prebuilt-install/build

Quick Start with prebuild

` javascript
const cv = require('opencv4nodejs-prebuilt-install');
`

With TypeScript

` javascript
import * as cv from 'opencv4nodejs-prebuilt-install'
`

Local compiling

Set your own properties inside of package.json for opencv4nodejs up to 4.6.0 depends on necessary versions and flags

`nodejs
"opencv4nodejs": {
"autoBuildWithoutContrib": 1,
"autoBuildOpencvVersion": "4.5.5",
"autoBuildFlags": "-DBUILD_opencv_world=1 -DBUILD_LIST=core,highgui,videoio -DOPENCV_FORCE_3RDPARTY_BUILD=ON -DBUILD_PNG=ON -DBUILD_TIFF=ON -DBUILD_JASPER=ON -DBUILD_JPEG=ON -DBUILD_ZLIB=ON -DBUILD_OPENEXR=ON -DWITH_FFMPEG=OFF -DWITH_GSTREAMER=ON -DWITH_VTK=OFF",
"disableAutoBuild": 1
},
`

- Then for building opencv for current processor

`nodejs
npm run create_opencvlib
`

Result in folder osOpencvWorlds/\/\.tar

- and then for building opencv for current node with have been prepared files for processor

`nodejs
npm run create_opencvnode_prebuild
`

Result in folder opencv/build/bin for windows or in opencv/build/lib for linux and darwin

Add bindings to native methods of opencv

Create fork of the repo and add necessary changes then create poll request to the repo and i will recreate libs

For example i was able to add method invert recently

- added to core.cc

`typescript
Nan::SetMethod(target, "invert", Invert);
Nan::SetMethod(target, "invertAsync", InvertAsync);

NAN_METHOD(Core::Invert) {
FF::syncBinding("Core", "Invert", info);
}

NAN_METHOD(Core::InvertAsync) {
FF::asyncBinding("Core", "Invert", info);
}
`

- added to core.h

`typescript
static NAN_METHOD(Invert);
static NAN_METHOD(InvertAsync);
`

- added to coreBinding.h

`typescript
class Invert : public CvClassMethodBinding {
public:
void createBinding(std::shared_ptr> self) {
auto flags = opt("flags", 0);
auto dst = ret("dst");

executeBinding = [=]() {
cv::invert(self->ref(), dst->ref(), flags->ref());
};
};
};
`

- added to cv.d.ts

`typescript
export function invert(mat: Mat, flags?: number): Mat;
export function invertAsync(mat: Mat, flags?: number): Promise;
``