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/**************************************************************************
*
* Copyright 2008-2010 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
**************************************************************************/

/*
* Image I/O.
*/

#ifndef _IMAGE_HPP_
#define _IMAGE_HPP_


#include <fstream>


namespace image {


class Image {
public:
    unsigned width;
    unsigned height;
    unsigned channels;

    // Flipped vertically or not
    bool flipped;

    // Pixels in RGBA format
    unsigned char *pixels;

    inline Image(unsigned w, unsigned h, unsigned c = 4, bool f = false) :
        width(w),
        height(h),
        channels(c),
        flipped(f),
        pixels(new unsigned char[h*w*c])
    {}

    inline ~Image() {
        delete [] pixels;
    }

    inline unsigned char *start(void) {
        return flipped ? pixels + (height - 1)*width*channels : pixels;
    }

    inline const unsigned char *start(void) const {
        return flipped ? pixels + (height - 1)*width*channels : pixels;
    }

    inline unsigned char *end(void) {
        return flipped ? pixels - width*channels : pixels + height*width*channels;
    }

    inline const unsigned char *end(void) const {
        return flipped ? pixels - width*channels : pixels + height*width*channels;
    }

    inline signed stride(void) const {
        return flipped ? -(signed)(width*channels) : width*channels;
    }

    bool writeBMP(const char *filename) const;

    void writePNM(std::ostream &os, const char *comment = NULL) const;

    inline bool writePNM(const char *filename, const char *comment = NULL) const {
        std::ofstream os(filename, std::ofstream::binary);
        if (!os) {
            return false;
        }
        writePNM(os, comment);
        return true;
    }

    bool writePNG(const char *filename) const;

    double compare(Image &ref);
};

bool writePixelsToBuffer(unsigned char *pixels,
                         unsigned w, unsigned h, unsigned numChannels,
                         bool flipped,
                         char **buffer,
                         int *size);

Image *
readPNG(const char *filename);

const char *
readPNMHeader(const char *buffer, size_t size, unsigned *channels, unsigned *width, unsigned *height);

} /* namespace image */


#endif /* _IMAGE_HPP_ */
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