/* FasTC
 * Copyright (c) 2015 University of North Carolina at Chapel Hill.
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for educational, research, and non-profit purposes, without
 * fee, and without a written agreement is hereby granted, provided that the
 * above copyright notice, this paragraph, and the following four paragraphs
 * appear in all copies.
 *
 * Permission to incorporate this software into commercial products may be
 * obtained by contacting the authors or the Office of Technology Development
 * at the University of North Carolina at Chapel Hill <otd@unc.edu>.
 *
 * This software program and documentation are copyrighted by the University of
 * North Carolina at Chapel Hill. The software program and documentation are
 * supplied "as is," without any accompanying services from the University of
 * North Carolina at Chapel Hill or the authors. The University of North
 * Carolina at Chapel Hill and the authors do not warrant that the operation of
 * the program will be uninterrupted or error-free. The end-user understands
 * that the program was developed for research purposes and is advised not to
 * rely exclusively on the program for any reason.
 *
 * IN NO EVENT SHALL THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL OR THE
 * AUTHORS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL,
 * OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF
 * THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF NORTH CAROLINA
 * AT CHAPEL HILL OR THE AUTHORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 * THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL AND THE AUTHORS SPECIFICALLY
 * DISCLAIM ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ANY 
 * STATUTORY WARRANTY OF NON-INFRINGEMENT. THE SOFTWARE PROVIDED HEREUNDER IS ON
 * AN "AS IS" BASIS, AND THE UNIVERSITY  OF NORTH CAROLINA AT CHAPEL HILL AND
 * THE AUTHORS HAVE NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, 
 * ENHANCEMENTS, OR MODIFICATIONS.
 *
 * Please send all BUG REPORTS to <pavel@cs.unc.edu>.
 *
 * The authors may be contacted via:
 *
 * Pavel Krajcevski
 * Dept of Computer Science
 * 201 S Columbia St
 * Frederick P. Brooks, Jr. Computer Science Bldg
 * Chapel Hill, NC 27599-3175
 * USA
 * 
 * <http://gamma.cs.unc.edu/FasTC/>
 */

#ifndef _COMPRESSED_IMAGE_H_
#define _COMPRESSED_IMAGE_H_

#include "FasTC/TexCompTypes.h"
#include "FasTC/CompressionFormat.h"
#include "FasTC/Image.h"

class CompressedImage : public FasTC::Image<FasTC::Pixel> {
 private:
  FasTC::ECompressionFormat m_Format;
  uint8 *m_CompressedData;

  typedef FasTC::Image<FasTC::Pixel> UncompressedImage;

 public:
  CompressedImage(const CompressedImage &);
  CompressedImage &operator=(const CompressedImage &);

  // Create a compressed image from the given data according to
  // the passed format. The size of the data is expected to conform
  // to the width, height, and format specified.
  CompressedImage(
    const uint32 width,
    const uint32 height,
    const FasTC::ECompressionFormat format,
    const uint8 *data
  );

  virtual ~CompressedImage();

  virtual FasTC::Image<FasTC::Pixel> *Clone() const {
    return new CompressedImage(*this);
  }

  virtual void ComputePixels();

  static uint32 GetCompressedSize(uint32 uncompressedSize, FasTC::ECompressionFormat format);
  static uint32 GetUncompressedSize(uint32 compressedSize, FasTC::ECompressionFormat format) {
    uint32 cmp = GetCompressedSize(compressedSize, format);
    return compressedSize * (compressedSize / cmp);
  }

  uint32 GetCompressedSize() const {
    return GetCompressedSize(GetUncompressedSize(), m_Format);
  }
  uint32 GetUncompressedSize() const {
    return GetWidth() * GetHeight() * sizeof(uint32);
  }

  // Decompress the compressed image data into outBuf. outBufSz is expected
  // to be the proper size determined by the width, height, and format.
  // !FIXME! We should have a function to explicitly return the in/out buf
  // size for a given compressed image.
  bool DecompressImage(uint8 *outBuf, uint32 outBufSz) const;

  const uint8 *GetCompressedData() const { return m_CompressedData; }

  FasTC::ECompressionFormat GetFormat() const { return m_Format; }
};

#endif // _COMPRESSED_IMAGE_H_
