/*

% Copyright (C) 2003-2020 GraphicsMagick Group

% Copyright (C) 2002 ImageMagick Studio

% Copyright 1991-1999 E. I. du Pont de Nemours and Company

%

% This program is covered by multiple licenses, which are described in

% Copyright.txt. You should have received a copy of Copyright.txt with this

% package; otherwise see http://www.graphicsmagick.org/www/Copyright.html.

%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%                                                                             %

%                                                                             %

%                                                                             %

%                         M   M   OOO   N   N   OOO                           %

%                         MM MM  O   O  NN  N  O   O                          %

%                         M M M  O   O  N N N  O   O                          %

%                         M   M  O   O  N  NN  O   O                          %

%                         M   M   OOO   N   N   OOO                           %

%                                                                             %

%                                                                             %

%                   Read/Write Raw Bi-Level Bitmap Format.                    %

%                                                                             %

%                                                                             %

%                              Software Design                                %

%                                John Cristy                                  %

%                                 July 1992                                   %

%                                                                             %

%                                                                             %

%                                                                             %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

%

*/

/*

  Include declarations.

*/

#include "magick/studio.h"

#include "magick/blob.h"

#include "magick/colormap.h"

#include "magick/magick.h"

#include "magick/monitor.h"

#include "magick/pixel_cache.h"

#include "magick/utility.h"

/*

  Forward declarations.

*/

static unsigned int

  WriteMONOImage(const ImageInfo *,Image *);

/*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%                                                                             %

%                                                                             %

%                                                                             %

%   R e a d M O N O I m a g e                                                 %

%                                                                             %

%                                                                             %

%                                                                             %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

%  Method ReadMONOImage reads an image of raw bytes in LSB order and returns

%  it.  It allocates the memory necessary for the new Image structure and

%  returns a pointer to the new image.

%

%  The format of the ReadMONOImage method is:

%

%      Image *ReadMONOImage(const ImageInfo *image_info,

%        ExceptionInfo *exception)

%

%  A description of each parameter follows:

%

%    o image:  Method ReadMONOImage returns a pointer to the image after

%      reading.  A null image is returned if there is a memory shortage or

%      if the image cannot be read.

%

%    o image_info: Specifies a pointer to a ImageInfo structure.

%

%    o exception: return any errors or warnings in this structure.

%

%

*/

static Image *ReadMONOImage(const ImageInfo *image_info,

  ExceptionInfo *exception)

{

  Image

    *image;

  long

    y;

  register IndexPacket

    *indexes;

  register long

    x;

  register PixelPacket

    *q;

  register long

    i;

  unsigned char

    bit,

    byte;

  unsigned int

    status;

  /*

    Open image file.

  */

  assert(image_info != (const ImageInfo *) NULL);

  assert(image_info->signature == MagickSignature);

  assert(exception != (ExceptionInfo *) NULL);

  assert(exception->signature == MagickSignature);

  image=AllocateImage(image_info);

  if ((image->columns == 0) || (image->rows == 0))

    ThrowReaderException(OptionError,MustSpecifyImageSize,image);

  status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);

  if (status == False)

    ThrowReaderException(FileOpenError,UnableToOpenFile,image);

  for (i=0; i < image->offset; i++)

    {

      if (EOF == ReadBlobByte(image))

        ThrowException(exception,CorruptImageError,UnexpectedEndOfFile,

                       image->filename);

    }

  /*

    Initialize image colormap.

  */

  if (!AllocateImageColormap(image,2))

    ThrowReaderException(ResourceLimitError,MemoryAllocationFailed,image);

  if (image_info->ping)

    {

      CloseBlob(image);

      StopTimer(&image->timer);

      return(image);

    }

  /*

    Convert bi-level image to pixel packets.

  */

  for (y=0; y < (long) image->rows; y++)

  {

    q=SetImagePixels(image,0,y,image->columns,1);

    if (q == (PixelPacket *) NULL)

      break;

    indexes=AccessMutableIndexes(image);

    bit=0U;

    byte=0U;

    for (x=0; x < (long) image->columns; x++)

    {

      if (bit == 0U)

        byte=ReadBlobByte(image);

      indexes[x]=(byte & 0x01U) ? 0x01U : 0x00U;

      bit++;

      if (bit == 8U)

        bit=0U;

      byte>>=1U;

    }

    if (!SyncImagePixels(image))

      break;

    if (QuantumTick(y,image->rows))

      if (!MagickMonitorFormatted(y,image->rows,exception,LoadImageText,

                                  image->filename,

                                  image->columns,image->rows))

        break;

  }

  (void) SyncImage(image);

  if (EOFBlob(image))

    ThrowException(exception,CorruptImageError,UnexpectedEndOfFile,

      image->filename);

  CloseBlob(image);

  StopTimer(&image->timer);

  return(image);

}

/*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%                                                                             %

%                                                                             %

%                                                                             %

%   R e g i s t e r M O N O I m a g e                                         %

%                                                                             %

%                                                                             %

%                                                                             %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

%  Method RegisterMONOImage adds attributes for the MONO image format to

%  the list of supported formats.  The attributes include the image format

%  tag, a method to read and/or write the format, whether the format

%  supports the saving of more than one frame to the same file or blob,

%  whether the format supports native in-memory I/O, and a brief

%  description of the format.

%

%  The format of the RegisterMONOImage method is:

%

%      RegisterMONOImage(void)

%

*/

ModuleExport void RegisterMONOImage(void)

{

  MagickInfo

    *entry;

  entry=SetMagickInfo("MONO");

  entry->decoder=(DecoderHandler) ReadMONOImage;

  entry->encoder=(EncoderHandler) WriteMONOImage;

  entry->adjoin=False;

  entry->description="Bi-level bitmap in least-significant-byte first order";

  entry->raw=True;

  entry->module="MONO";

  (void) RegisterMagickInfo(entry);

}

/*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%                                                                             %

%                                                                             %

%                                                                             %

%   U n r e g i s t e r M O N O I m a g e                                     %

%                                                                             %

%                                                                             %

%                                                                             %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

%  Method UnregisterMONOImage removes format registrations made by the

%  MONO module from the list of supported formats.

%

%  The format of the UnregisterMONOImage method is:

%

%      UnregisterMONOImage(void)

%

*/

ModuleExport void UnregisterMONOImage(void)

{

  (void) UnregisterMagickInfo("MONO");

}

/*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%                                                                             %

%                                                                             %

%                                                                             %

%   W r i t e M O N O I m a g e                                               %

%                                                                             %

%                                                                             %

%                                                                             %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

%  Method WriteMONOImage writes an image of raw bits in LSB order to a file.

%

%  The format of the WriteMONOImage method is:

%

%      unsigned int WriteMONOImage(const ImageInfo *image_info,Image *image)

%

%  A description of each parameter follows.

%

%    o status: Method WriteMONOImage return True if the image is written.

%      False is returned is there is a memory shortage or if the image file

%      fails to write.

%

%    o image_info: Specifies a pointer to a ImageInfo structure.

%

%    o image:  A pointer to an Image structure.

%

%

*/

static unsigned int WriteMONOImage(const ImageInfo *image_info,Image *image)

{

  long

    y;

  register const IndexPacket

    *indexes;

  register const PixelPacket

    *p;

  register long

    x;

  unsigned char

    bit,

    byte,

    polarity;

  unsigned int

    status;

  /*

    Open output image file.

  */

  assert(image_info != (const ImageInfo *) NULL);

  assert(image_info->signature == MagickSignature);

  assert(image != (Image *) NULL);

  assert(image->signature == MagickSignature);

  status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);

  if (status == False)

    ThrowWriterException(FileOpenError,UnableToOpenFile,image);

  (void) TransformColorspace(image,RGBColorspace);

  /*

    Convert image to a bi-level image.

  */

  (void) SetImageType(image,BilevelType);

  polarity=PixelIntensityToQuantum(&image->colormap[0]) < (MaxRGB/2);

  if (image->colors == 2)

    polarity=PixelIntensityToQuantum(&image->colormap[0]) <

      PixelIntensityToQuantum(&image->colormap[1]);

  for (y=0; y < (long) image->rows; y++)

  {

    p=AcquireImagePixels(image,0,y,image->columns,1,&image->exception);

    if (p == (const PixelPacket *) NULL)

      break;

    indexes=AccessImmutableIndexes(image);

    bit=0;

    byte=0;

    for (x=0; x < (long) image->columns; x++)

    {

      byte>>=1;

      if (indexes[x] == polarity)

        byte|=0x80;

      bit++;

      if (bit == 8)

        {

          (void) WriteBlobByte(image,byte);

          bit=0;

          byte=0;

        }

    }

    if (bit != 0)

      (void) WriteBlobByte(image,byte >> (8-bit));

    if (QuantumTick(y,image->rows))

      if (!MagickMonitorFormatted(y,image->rows,&image->exception,

                                  SaveImageText,image->filename,

                                  image->columns,image->rows))

        break;

  }

  status &= CloseBlob(image);

  return(status);

}