// Copyright 2013 jrweizhang AT gmail.com. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package opencv

//#include "opencv.h"
//#cgo linux  pkg-config: opencv
//#cgo darwin pkg-config: opencv
//#cgo freebsd pkg-config: opencv
//#cgo windows LDFLAGS: -lopencv_core242.dll -lopencv_imgproc242.dll -lopencv_photo242.dll -lopencv_highgui242.dll -lstdc++
import "C"
import (
	//"errors"
	//"log"
	"unsafe"
)

func Resize(src *IplImage, width, height, interpolation int) *IplImage {
	if width == 0 && height == 0 {
		panic("Width and Height cannot be 0 at the same time")
	}
	if width == 0 {
		ratio := float64(height) / float64(src.Height())
		width = int(float64(src.Width()) * ratio)
	} else if height == 0 {
		ratio := float64(width) / float64(src.Width())
		height = int(float64(src.Height()) * ratio)
	}

	dst := CreateImage(width, height, src.Depth(), src.Channels())
	C.cvResize(unsafe.Pointer(src), unsafe.Pointer(dst), C.int(interpolation))
	return dst
}

func NewRect(x, y, width, height int) Rect {
	r := C.cvRect(
		C.int(x),
		C.int(y),
		C.int(width),
		C.int(height),
	)
	return Rect(r)
}

func Crop(src *IplImage, x, y, width, height int) *IplImage {
	rect := NewRect(x, y, width, height)

	src.SetROI(rect)
	dest := CreateImage(width, height, src.Depth(), src.Channels())
	Copy(src, dest, nil)
	src.ResetROI()

	return dest
}