# P(NG)Convert Rust

The [Rust](https://www.rust-lang.org) version of the famous [P(NG)Convert](https://github.com/hivesolutions/pconvert) from Hive Solutions.

This Rust crate can be used as a **command line application**, as a **crate** in another rust project, as a **Web Assembly module** (able to be used within JavaScript that targets web browsers or NodeJS) or as a **Python package**.

## Command Line Application

### Compiling & Executing

Build and run with:

```bash
cargo run
```

Alternatively, compile first with:

```bash
cargo build
```

and then run the binary with:

```bash
./target/debug/pconvert-rust
```

Additionally, for better code optimization, compile with the `--release` flag:

```bash
cargo build --release
```

and then run the release binary with:

```bash
./target/release/pconvert-rust
```

### Usage

```console
$ pconvert-rust
Usage: pconvert-rust <command> [args...]
where command can be one of the following: compose, convert, benchmark, version
```

```console
$ pconvert-rust compose <dir>
```

```console
$ pconvert-rust convert <file_in> <file_out>
```

```console
$ pconvert-rust benchmark <dir> [--parallel]
```

```console
$ pconvert-rust version
```

### Example

```rust
// blends the provided image as a new image to be used
// under the current instance
let top = pconvert_rust::utils::read_png_from_file("top.png".to_string(), false).unwrap();
let mut bottom = pconvert_rust::utils::read_png_from_file("bottom.png".to_string(), false).unwrap();

// gathers the mask top blending algorithm function and
// uses it to blend both images
let blending_fn = pconvert_rust::blending::get_blending_algorithm(
    &pconvert_rust::blending::BlendAlgorithm::DestinationOver,
);
pconvert_rust::blending::blend_images(&mut bottom, &top, &blending_fn, &None);

// "outputs" the blended image contents to the `out.png` file
pconvert_rust::utils::write_png_to_file_d("out.png".to_string(), &bottom).unwrap();
```

## WebAssembly (WASM) Module

### Compiling & Executing

Follow [this guide](https://developer.mozilla.org/en-US/docs/WebAssembly/Rust_to_wasm) on how to install `wasm-pack`.

To build, use the `wasm-extension` feature:

```bash
wasm-pack build -- --features wasm-extension
```

To run the demo, follow [this](https://developer.mozilla.org/en-US/docs/WebAssembly/Rust_to_wasm#Making_our_package_availabe_to_npm).

### Usage

Check the [demo site](examples/wasm/index.js) to see how to use the PConvert WASM module.

JavaScript API exposed:

```javascript
// blends two File objects and returns a File object
blendImages(bot, top, targetFileName, algorithm, isInline, options)

// blends two ImageData objects and returns an ImageData object
blendImagesData(bot, top, algorithm, isInline, options)

// blends multiple File objects and returns a File object
blendMultiple(imageFiles, targetFileName, algorithm, algorithms, isInline, options)

// blends multiple ImageData objects  and returns an ImageData object
blendMultipleData(images, algorithm, algorithms, isInline, options)

// benchmarks and prints to console various times for different combinations of blending algorithms, compression algorithms and filters for `blendImages`
blendImagesBenchmarkAll(bot, top, isInline)

// benchmarks and prints to console various times for different combinations of blending algorithms, compression algorithms and filters for `blendMultiple`
blendMultipleBenchmarkAll(imageFiles, isInline)

// returns a JSON of module constants (e.g. ALGORITHMS, FILTER_TYPES, COMPILER_VERSION, ...)
getModuleConstants()
```

## Python package

### Compiling & Executing

This crate can be installed as a python package through the use of `pip`. Simply run:

```bash
pip install .
```

### Usage

Check [this folder](examples/python/) for examples.

Import the python package with:

```python
import pconvert_rust
```

Python API exposed. The parameter `options` is a python dictionary of optional parameters and if `num_threads` is specified with a value of 1 or more, the work load will be distributed across multiple threads (belonging to a internally managed thread pool).

```python
# blends two images read from the local file system and writes the result to the file system
blend_images(bot_path, top_path, target_path, algorithm, is_inline, options)

# blends multiple images read from the local file system and writes the result to the file system
blend_multiple(img_paths, out_path, algorithm, algorithms, is_inline, options)

# returns a python dict with summary information about the internal thread pool (size, active jobs, queued jobs)
get_thread_pool_status()

# access module constants (e.g. ALGORITHMS, FILTER_TYPES, COMPILER_VERSION, ...)
pconvert_rust.ALGORITHMS
pconvert_rust.FILTER_TYPES
pconvert_rust.COMPILER_VERSION
```

## Tests

For rust crate tests:

```bash
cargo test
```

For python API tests:

```bash
python setup.py test
```

For WASM API tests:

```bash
npm test
```

## Documentation

Generate documentation using:

```bash
cargo doc --lib --all-features
```

## License

P(NG)Convert Rust is currently licensed under the [Apache License, Version 2.0](http://www.apache.org/licenses/).

## Build Automation

[![Build Status](https://app.travis-ci.com/ripe-tech/pconvert-rust.svg?branch=master)](https://travis-ci.com/github/ripe-tech/pconvert-rust)
[![Build Status GitHub](https://github.com/ripe-tech/pconvert-rust/workflows/Main%20Workflow/badge.svg)](https://github.com/ripe-tech/pconvert-rust/actions)
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[![npm Status](https://img.shields.io/npm/v/pconvert-rust.svg)](https://www.npmjs.com/package/pconvert-rust)
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