/*
 *
 *  Copyright (C) 2009-2014, OFFIS e.V.
 *  All rights reserved.  See COPYRIGHT file for details.
 *
 *  This software and supporting documentation were developed by
 *
 *    OFFIS e.V.
 *    R&D Division Health
 *    Escherweg 2
 *    D-26121 Oldenburg, Germany
 *
 *
 *  Module:  dcmdata
 *
 *  Author:  Uli Schlachter
 *
 *  Purpose: Class to extract pixel data and meta information from BMP file
 *
 */

#ifndef I2DBMPS_H
#define I2DBMPS_H

#include "dcmtk/config/osconfig.h"
#include "dcmtk/dcmdata/libi2d/i2dimgs.h"
#include "dcmtk/ofstd/offile.h"

/** This is a I2DImgSource implementation that can parse BMP files and convert
 *  them into DICOM images.
 */
class DCMTK_I2D_EXPORT I2DBmpSource : public I2DImgSource
{

public:

  /** Constructor, initializes member variables
   *  @return none
   */
  I2DBmpSource();

  /** Returns format of input image. For this class "BMP" is returned.
   *  @return Returns format of input image, i.e. "BMP".
   */
  OFString inputFormat() const;

  /** Extracts the raw BMP pixel data stream from a BMP file and returns some
   *  further information about this pixel data. Raw means that any header
   *  information is removed from the BMP stream.
   *  This function allocates memory for the pixel data returned to the user.
   *  The caller of this function is responsible for deleting the memory buffer.
   *  @param rows - [out] Rows of image
   *  @param cols - [out] Columns of image
   *  @param samplesPerPixel - [out] Number of components per pixel
   *  @param photoMetrInt - [out] The DICOM color model used for the compressed data
   *  @param bitsAlloc - [out] Bits Allocated for one sample
   *  @param bitsStored - [out] Bits Stored, Number of bits actually stored within
   *                            Bits Allocated
   *  @param highBit - [out] High Bit, Highest stored in bit within Bits Allocated
   *  @param pixelRepr - [out] Pixel Representation (0=unsigned, 1=signed)
   *  @param planConf - [out] Planar Configuration
   *  @param pixAspectH - [out] Horizontal value of pixel aspect ratio
   *  @param pixAspectV - [out] Vertical value of pixel aspect ratio
   *  @param pixData - [out] Pointer to the pixel data in BMP Interchange Format
   *  @param length - [out] Length of pixel data
   *  @param ts - [out] The transfer syntax imposed by the imported pixel pixel data
   *  @return EC_Normal, if successful, error otherwise
   */
  OFCondition readPixelData( Uint16& rows,
                             Uint16& cols,
                             Uint16& samplesPerPixel,
                             OFString& photoMetrInt,
                             Uint16& bitsAlloc,
                             Uint16& bitsStored,
                             Uint16& highBit,
                             Uint16& pixelRepr,
                             Uint16& planConf,
                             Uint16& pixAspectH,
                             Uint16& pixAspectV,
                             char*&  pixData,
                             Uint32& length,
                             E_TransferSyntax& ts);

  /** After reading of pixel data, this function can be used for getting
   *  information about lossy compression parameters.
   *  @param srcEncodingLossy - [out] Always returns OFFalse (i.e. lossless)
   *  @param srcLossyComprMethod - [out] Unused parameter
   *  @return EC_Normal if information is available, error otherwise
   */
  virtual OFCondition getLossyComprInfo(OFBool& srcEncodingLossy,
                                        OFString& /* srcLossyComprMethod */) const
  {
    srcEncodingLossy = OFFalse;
    return EC_Normal;
  }

  /** Destructor, frees some memory.
   *  @return none
   */
  virtual ~I2DBmpSource();

protected:

  /** Opens the BMP file specified by the given filename.
   *  @param filename - [in] The file to be opened
   *  @return EC_Normal, if successful, error otherwise
   */
  OFCondition openFile(const OFString& filename);

  /** Closes BMP file.
   *  @return none
   */
  void closeFile();

  /** Reads and checks the BMP file header.
   *  @param offset - [out] Offset to the BMP data from beginning of file
   *  @return EC_Normal, if successful, error otherwise
   */
  OFCondition readFileHeader(Uint32 &offset);

  /** Reads and checks the BMP bitmap header.
   *  After this function, the current read position is just after the
   *  header. That is, at the beginning of the color palette.
   *  @param width - [out] width of the image in pixel
   *  @param height - [out] height of the image in pixel
   *  @param isTopDown - [out] OFTrue if this is a top down bitmap
   *                     (height was read as negative value). OFFalse otherwise.
   *  @param bpp - [out] bits per pixel of the image.
   *  @param colors - [out] number of entries in color table.
   *  @return EC_Normal, if successful, error otherwise
   */
  OFCondition readBitmapHeader(Uint16 &width     /*out*/,
                               Uint16 &height    /*out*/,
                               Uint16 &bpp       /*out*/,
                               OFBool &isTopDown /*out*/,
                               Uint16 &colors    /*out*/);

  /** Read the color palette from the file.
   *  @param colors - [in] number of colors to read
   *  @param palette - [out] the read color palette is stored here
   *  @return EC_Normal, if successful, error otherwise
   */
  OFCondition readColorPalette(Uint16 colors,
                               Uint32*& palette);

  /** Read the bitmap data.
   *  This assumes the current read position is at the start of the image data.
   *  @param width - [in] width of the image in pixel
   *  @param height - [in] height of the image in pixel
   *  @param bpp - [in] Image's bits per pixel.
   *  @param isTopDown - [in] If true, this is a top down bitmap
   *  @param colors - [in] Number of color palette entries
   *  @param palette - [in] Color palette
   *  @param pixData - [out] Image data
   *  @param length - [out] Length of data
   *  @return EC_Normal, if successful, error otherwise
   */
  OFCondition readBitmapData(const Uint16 width,
                             const Uint16 height,
                             const Uint16 bpp,
                             const OFBool isTopDown,
                             const Uint16 colors,
                             const Uint32* palette,
                             char*& pixData /*out*/,
                             Uint32& length /*out*/);

  /** Parse a single 24bpp or 32bpp row of BMP data.
   *  @param row - [in] The row of data to parse.
   *  @param width - [in] The length in pixel of the row.
   *  @param bpp - [in] The number of bits per pixel.
   *  @param pixData - [out] The buffer to write the data to (in "RGB" format).
   *  @return EC_Normal, if successful, error otherwise
   */
  OFCondition parse24_32BppRow(const Uint8 *row,
                               const Uint16 width,
                               const int bpp,
                               char *pixData /*out*/) const;

  /** Parse a single 16bpp row of BMP data.
   *  @param row - [in] The row of data to parse.
   *  @param width - [in] The length in pixel of the row.
   *  @param pixData - [out] The buffer to write the data to (in "RGB" format).
   *  @return EC_Normal, if successful, error otherwise
   */
  OFCondition parse16BppRow(const Uint8 *row,
                            const Uint16 width,
                            char *pixData /*out*/) const;

  /** Parse a single 1, 4 or 8bpp row of BMP data.
   *  @param row - [in] The row of data to parse.
   *  @param width - [in] The length in pixel of the row.
   *  @param bpp - [in] The number of bits per pixel.
   *  @param colors - [in] The number of entries in the color palette.
   *  @param palette - [in] The color palette to use.
   *  @param pixData - [out] The buffer to write the data to (in "RGB" format).
   *  @return EC_Normal, if successful, error otherwise
   */
  OFCondition parseIndexedColorRow(const Uint8 *row,
                                   const Uint16 width,
                                   const int bpp,
                                   const Uint16 colors,
                                   const Uint32* palette,
                                   char *pixData /*out*/) const;

  /** Read 4 bytes from the byte stream and interpret it as a signed integer.
   *  @param result - [out] The result
   *  @return 0, if successful, EOF if rest of stream does not contain enough bytes
   */
  int readLong(Sint32& result);

  /** Read 4 bytes from the byte stream.
   *  @param result - [out] The result
   *  @return 0, if successful, EOF if rest of stream does not contain enough bytes
   */
  int readDWord(Uint32& result);

  /** Read 2 bytes from the byte stream.
   *  @param result - [out] The result
   *  @return 0, if successful, EOF if rest of stream does not contain enough bytes
   */
  int readWord(Uint16& result);

  /// The BMP file, if opened
  OFFile bmpFile;
};

#endif // I2DBMPS_H