#include "labimage.h"
#include <memory.h>
namespace rtengine {

LabImage::LabImage (int w, int h) : fromImage(false), W(w), H(h) {

    L = new float*[H];
    a = new float*[H];
    b = new float*[H];

    data = new float [W*H*3];
    float * index = data;
    for (int i=0; i<H; i++)
        L[i] = index + i*W;
    index+=W*H;
    for (int i=0; i<H; i++)
        a[i] = index + i*W;
    index+=W*H;

    for (int i=0; i<H; i++)
        b[i] = index + i*W;
}

LabImage::~LabImage () {

    if (!fromImage) {
        delete [] L;
        delete [] a;
        delete [] b;
        delete [] data;
    }
}

void LabImage::CopyFrom(LabImage *Img){
    memcpy(data, Img->data, W*H*3*sizeof(float));
}

void LabImage::getPipetteData (float &v1, float &v2, float &v3, int posX, int posY, int squareSize) {
    float accumulator_L = 0.f;
    float accumulator_a = 0.f;
    float accumulator_b = 0.f;
    unsigned long int n = 0;
    int halfSquare = squareSize/2;
    for (int iy=posY-halfSquare; iy<posY-halfSquare+squareSize; ++iy) {
        for (int ix=posX-halfSquare; ix<posX-halfSquare+squareSize; ++ix) {
            if (ix>=0 && iy>=0 && ix<W && iy<H) {
                accumulator_L += L[iy][ix];
                accumulator_a += a[iy][ix];
                accumulator_b += b[iy][ix];
                ++n;
            }
        }
    }
    v1 = n ? accumulator_L/float(n) : 0.f;
    v2 = n ? accumulator_a/float(n) : 0.f;
    v3 = n ? accumulator_b/float(n) : 0.f;
}

}