ngryman/ribs

/*!
 * ribs
 * Copyright (c) 2013-2014 Nicolas Gryman <ngryman@gmail.com>
 * LGPL Licensed
 */

#include "crop.h"
#include "../image.h"

using namespace v8;
using namespace node;
using namespace ribs;

OPERATION_PREPARE(Crop, {
    // check against mandatory image input (from this)
    image = ObjectWrap::Unwrap<Image>(args.This());

    // create a persistent object during the process to avoid v8 to dispose the JavaScript image object.
    NanAssignPersistent(Object, imageHandle, args.This());

    // store width & height
    width  = args[0]->Uint32Value();
    height = args[1]->Uint32Value();
    x      = args[2]->Uint32Value();
    y      = args[3]->Uint32Value();
})

OPERATION_CLEANUP(Crop, {
    if (!imageHandle.IsEmpty()) NanDisposePersistent(imageHandle);
})

OPERATION_PROCESS(Crop, {
    try {
        cv::Rect roi(x, y, width, height);
        cv::Mat mat = image->Matrix();
        cv::Mat res = mat(roi).clone();

        image->Matrix(res);
    }
    catch (const cv::Exception& e) {
        error = "operation error: crop";
    }
})

OPERATION_VALUE(Crop, {
    image->Sync(imageHandle);
    return NanPersistentToLocal(imageHandle);
})