
/*
    pbrt source code Copyright(c) 1998-2010 Matt Pharr and Greg Humphreys.

    This file is part of pbrt.

    pbrt is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.  Note that the text contents of
    the book "Physically Based Rendering" are *not* licensed under the
    GNU GPL.

    pbrt is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

#if defined(_MSC_VER)
#pragma once
#endif

#ifndef PBRT_FILM_IMAGE_H
#define PBRT_FILM_IMAGE_H

// film/image.h*
#include "pbrt.h"
#include "film.h"
#include "sampler.h"
#include "filter.h"
#include "paramset.h"

// ImageFilm Declarations
class ImageFilm : public Film {
public:
    // ImageFilm Public Methods
    ImageFilm(int xres, int yres, Filter *filt, const float crop[4],
              const string &filename, bool openWindow);
    ~ImageFilm() {
        delete pixels;
        delete filter;
        delete[] filterTable;
    }
    void AddSample(const CameraSample &sample, const Spectrum &L);
    void Splat(const CameraSample &sample, const Spectrum &L);
    void GetSampleExtent(int *xstart, int *xend, int *ystart, int *yend) const;
    void GetPixelExtent(int *xstart, int *xend, int *ystart, int *yend) const;
    void WriteImage(float splatScale);
    void UpdateDisplay(int x0, int y0, int x1, int y1, float splatScale);
private:
    // ImageFilm Private Data
    Filter *filter;
    float cropWindow[4];
    string filename;
    int xPixelStart, yPixelStart, xPixelCount, yPixelCount;
    struct Pixel {
        Pixel() {
            for (int i = 0; i < 3; ++i) Lxyz[i] = splatXYZ[i] = 0.f;
            weightSum = 0.f;
        }
        float Lxyz[3];
        float weightSum;
        float splatXYZ[3];
        float pad;
    };
    BlockedArray<Pixel> *pixels;
    float *filterTable;
};


ImageFilm *CreateImageFilm(const ParamSet &params, Filter *filter);

#endif // PBRT_FILM_IMAGE_H
