/*

% Copyright (C) 2003-2020 GraphicsMagick Group

% Copyright (C) 2002 ImageMagick Studio

%

% 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.

%

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

%                                                                             %

%                                                                             %

%                                                                             %

%                              OOO   TTTTT  BBBB                              %

%                             O   O    T    B   B                             %

%                             O   O    T    BBBB                              %

%                             O   O    T    B   B                             %

%                              OOO     T    BBBB                              %

%                                                                             %

%                                                                             %

%                     Read/Write On-The-Air Image Format.                     %

%                                                                             %

%                                                                             %

%                              Software Design                                %

%                                John Cristy                                  %

%                               January 2000                                  %

%                                                                             %

%                                                                             %

%                                                                             %

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

%

%

*/

/*

  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

  WriteOTBImage(const ImageInfo *,Image *);

/*

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%                                                                             %

%                                                                             %

%   R e a d O T B I m a g e                                                   %

%                                                                             %

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%                                                                             %

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%

%  Method ReadOTBImage reads a on-the-air (level 0) bitmap 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 ReadOTBImage method is:

%

%      Image *ReadOTBImage(const ImageInfo *image_info,ExceptionInfo *exception)

%

%  A description of each parameter follows:

%

%    o image:  Method ReadOTBImage 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 *ReadOTBImage(const ImageInfo *image_info,ExceptionInfo *exception)

{

#define GetBit(a,i) (((a) >> (i)) & 1L)

  Image

    *image;

  int

    byte;

  long

    y;

  register IndexPacket

    *indexes;

  register long

    x;

  register PixelPacket

    *q;

  unsigned char

    bit,

    info,

    depth;

  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);

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

  if (status == False)

    ThrowReaderException(FileOpenError,UnableToOpenFile,image);

  /*

    Initialize image structure.

  */

  info=ReadBlobByte(image);

  if (GetBit(info,4) == 0)

    {

      image->columns=ReadBlobByte(image);

      image->rows=ReadBlobByte(image);

    }

  else

    {

      image->columns=ReadBlobMSBShort(image);

      image->rows=ReadBlobMSBShort(image);

    }

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

    ThrowReaderException(CorruptImageError,ImproperImageHeader,image);

  depth=ReadBlobByte(image);

  if (depth != 1)

    ThrowReaderException(CoderError,OnlyLevelZerofilesSupported,image);

  if (!AllocateImageColormap(image,2))

    ThrowReaderException(ResourceLimitError,MemoryAllocationFailed,image);

  if (image_info->ping)

    {

      CloseBlob(image);

      StopTimer(&image->timer);

      return(image);

    }

  if (CheckImagePixelLimits(image, exception) != MagickPass)

    ThrowReaderException(ResourceLimitError,ImagePixelLimitExceeded,image);

  /*

    Convert bi-level image to pixel packets.

  */

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

  {

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

    if (q == (PixelPacket *) NULL)

      break;

    indexes=AccessMutableIndexes(image);

    bit=0;

    byte=0;

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

    {

      if (bit == 0)

        {

          byte=ReadBlobByte(image);

          if (byte == EOF)

            ThrowReaderException(CorruptImageError,CorruptImage,image);

        }

      indexes[x]=(byte & (0x01 << (7-bit))) ? 0x01 : 0x00;

      bit++;

      if (bit == 8)

        bit=0;

    }

    if (!SyncImagePixelsEx(image,exception))

      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 O T B I m a g e                                           %

%                                                                             %

%                                                                             %

%                                                                             %

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

%

%  Method RegisterOTBImage adds attributes for the OTB 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 RegisterOTBImage method is:

%

%      RegisterOTBImage(void)

%

*/

ModuleExport void RegisterOTBImage(void)

{

  MagickInfo

    *entry;

  entry=SetMagickInfo("OTB");

  entry->decoder=(DecoderHandler) ReadOTBImage;

  entry->encoder=(EncoderHandler) WriteOTBImage;

  entry->adjoin=False;

  entry->description="On-the-air bitmap";

  entry->module="OTB";

  (void) RegisterMagickInfo(entry);

}

/*

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

%                                                                             %

%                                                                             %

%                                                                             %

%   U n r e g i s t e r O T B I m a g e                                       %

%                                                                             %

%                                                                             %

%                                                                             %

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

%

%  Method UnregisterOTBImage removes format registrations made by the

%  OTB module from the list of supported formats.

%

%  The format of the UnregisterOTBImage method is:

%

%      UnregisterOTBImage(void)

%

*/

ModuleExport void UnregisterOTBImage(void)

{

  (void) UnregisterMagickInfo("OTB");

}

/*

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

%                                                                             %

%                                                                             %

%                                                                             %

%   W r i t e O T B I m a g e                                                 %

%                                                                             %

%                                                                             %

%                                                                             %

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

%

%  Method WriteOTBImage writes an image to a file in the On-the-air Bitmap

%  (level 0) image format.

%

%  The format of the WriteOTBImage method is:

%

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

%

%  A description of each parameter follows.

%

%    o status: Method WriteOTBImage 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 WriteOTBImage(const ImageInfo *image_info,Image *image)

{

#define SetBit(a,i,set) \

  a=(unsigned char) ((set) ? (a) | (1L << (i)) : (a) & ~(1L << (i)))

  long

    y;

  register const PixelPacket

    *p;

  register const IndexPacket

    *indexes;

  register long

    x;

  unsigned char

    bit,

    byte,

    info,

    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]);

  info=0;

  if ((image->columns >= 256) || (image->rows >= 256))

    SetBit(info,4,1);

  (void) WriteBlobByte(image,info);

  if ((image->columns >= 256) || (image->rows >= 256))

    {

      (void) WriteBlobMSBShort(image,image->columns);

      (void) WriteBlobMSBShort(image,image->rows);

    }

  else

    {

      (void) WriteBlobByte(image,(long) image->columns);

      (void) WriteBlobByte(image,(long) image->rows);

    }

  (void) WriteBlobByte(image,1);  /* depth */

  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++)

    {

      if (indexes[x] == polarity)

        byte|=0x1 << (7-bit);

      bit++;

      if (bit == 8)

        {

          (void) WriteBlobByte(image,byte);

          bit=0;

          byte=0;

        }

    }

    if (bit != 0)

      (void) WriteBlobByte(image,byte);

    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);

}