/*

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%                                                                             %

%                                                                             %

%                                                                             %

%                         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                                %

%                                   Cristy                                    %

%                                 July 1992                                   %

%                                                                             %

%                                                                             %

%  Copyright @ 1999 ImageMagick Studio LLC, a non-profit organization         %

%  dedicated to making software imaging solutions freely available.           %

%                                                                             %

%  You may not use this file except in compliance with the License.  You may  %

%  obtain a copy of the License at                                            %

%                                                                             %

%    https://imagemagick.org/script/license.php                               %

%                                                                             %

%  Unless required by applicable law or agreed to in writing, software        %

%  distributed under the License is distributed on an "AS IS" BASIS,          %

%  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %

%  See the License for the specific language governing permissions and        %

%  limitations under the License.                                             %

%                                                                             %

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

%

%

*/

/*

  Include declarations.

*/

#include "MagickCore/studio.h"

#include "MagickCore/attribute.h"

#include "MagickCore/blob.h"

#include "MagickCore/blob-private.h"

#include "MagickCore/cache.h"

#include "MagickCore/color-private.h"

#include "MagickCore/colormap.h"

#include "MagickCore/colorspace.h"

#include "MagickCore/colorspace-private.h"

#include "MagickCore/exception.h"

#include "MagickCore/exception-private.h"

#include "MagickCore/image.h"

#include "MagickCore/image-private.h"

#include "MagickCore/list.h"

#include "MagickCore/magick.h"

#include "MagickCore/memory_.h"

#include "MagickCore/monitor.h"

#include "MagickCore/monitor-private.h"

#include "MagickCore/pixel-accessor.h"

#include "MagickCore/quantum-private.h"

#include "MagickCore/static.h"

#include "MagickCore/string_.h"

#include "MagickCore/module.h"

/*

  Forward declarations.

*/

static MagickBooleanType

  WriteMONOImage(const ImageInfo *,Image *,ExceptionInfo *);

/*

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

%                                                                             %

%                                                                             %

%                                                                             %

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

%                                                                             %

%                                                                             %

%                                                                             %

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

%

%  ReadMONOImage() reads an image of raw bites 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_info: the image info.

%

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

%

*/

static Image *ReadMONOImage(const ImageInfo *image_info,

  ExceptionInfo *exception)

{

  Image

    *image;

  MagickBooleanType

    status;

  Quantum

    *q;

  ssize_t

    x;

  size_t

    bit,

    byte;

  ssize_t

    y;

  /*

    Open image file.

  */

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

  assert(image_info->signature == MagickCoreSignature);

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

  assert(exception->signature == MagickCoreSignature);

  if (IsEventLogging() != MagickFalse)

    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",

      image_info->filename);

  image=AcquireImage(image_info,exception);

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

    ThrowReaderException(OptionError,"MustSpecifyImageSize");

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

  if (status == MagickFalse)

    {

      image=DestroyImageList(image);

      return((Image *) NULL);

    }

  if (DiscardBlobBytes(image,(MagickSizeType) image->offset) == MagickFalse)

    ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",

      image->filename);

  /*

    Initialize image colormap.

  */

  image->depth=1;

  if (AcquireImageColormap(image,2,exception) == MagickFalse)

    ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");

  if (image_info->ping != MagickFalse)

    {

      (void) CloseBlob(image);

      return(GetFirstImageInList(image));

    }

  status=SetImageExtent(image,image->columns,image->rows,exception);

  if (status == MagickFalse)

    return(DestroyImageList(image));

  /*

    Convert bi-level image to pixel packets.

  */

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

  {

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

    if (q == (Quantum *) NULL)

      break;

    bit=0;

    byte=0;

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

    {

      if (bit == 0)

        byte=(size_t) ReadBlobByte(image);

      if (image_info->endian == LSBEndian)

        SetPixelIndex(image,(Quantum) (((byte & 0x01) != 0) ? 0x00 : 0x01),q);

      else

        SetPixelIndex(image,(Quantum) (((byte & 0x01) != 0) ? 0x01 : 0x00),q);

      bit++;

      if (bit == 8)

        bit=0;

      byte>>=1;

      q+=(ptrdiff_t) GetPixelChannels(image);

    }

    if (SyncAuthenticPixels(image,exception) == MagickFalse)

      break;

    status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,

      image->rows);

    if (status == MagickFalse)

      break;

  }

  (void) SyncImage(image,exception);

  if (EOFBlob(image) != MagickFalse)

    ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",

      image->filename);

  if (CloseBlob(image) == MagickFalse)

    status=MagickFalse;

  if (status == MagickFalse)

    return(DestroyImageList(image));

  return(GetFirstImageInList(image));

}

/*

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

%                                                                             %

%                                                                             %

%                                                                             %

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

%                                                                             %

%                                                                             %

%                                                                             %

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

%

%  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:

%

%      size_t RegisterMONOImage(void)

%

*/

ModuleExport size_t RegisterMONOImage(void)

{

  MagickInfo

    *entry;

  entry=AcquireMagickInfo("MONO","MONO","Raw bi-level bitmap");

  entry->decoder=(DecodeImageHandler *) ReadMONOImage;

  entry->encoder=(EncodeImageHandler *) WriteMONOImage;

  entry->flags|=CoderRawSupportFlag;

  entry->flags|=CoderEndianSupportFlag;

  entry->flags^=CoderAdjoinFlag;

  (void) RegisterMagickInfo(entry);

  return(MagickImageCoderSignature);

}

/*

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

%                                                                             %

%                                                                             %

%                                                                             %

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

%                                                                             %

%                                                                             %

%                                                                             %

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

%

%  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                                               %

%                                                                             %

%                                                                             %

%                                                                             %

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

%

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

%

%  The format of the WriteMONOImage method is:

%

%      MagickBooleanType WriteMONOImage(const ImageInfo *image_info,

%        Image *image,ExceptionInfo *exception)

%

%  A description of each parameter follows.

%

%    o image_info: the image info.

%

%    o image:  The image.

%

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

%

*/

static MagickBooleanType WriteMONOImage(const ImageInfo *image_info,

  Image *image,ExceptionInfo *exception)

{

  MagickBooleanType

    status;

  const Quantum

    *p;

  ssize_t

    x;

  size_t

    bit,

    byte;

  ssize_t

    y;

  /*

    Open output image file.

  */

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

  assert(image_info->signature == MagickCoreSignature);

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

  assert(image->signature == MagickCoreSignature);

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

  assert(exception->signature == MagickCoreSignature);

  if (IsEventLogging() != MagickFalse)

    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);

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

  if (status == MagickFalse)

    return(status);

  if (IssRGBCompatibleColorspace(image->colorspace) == MagickFalse)

    (void) TransformImageColorspace(image,sRGBColorspace,exception);

  /*

    Convert image to a bi-level image.

  */

  (void) SetImageType(image,BilevelType,exception);

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

  {

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

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

      break;

    bit=0;

    byte=0;

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

    {

      byte>>=1;

      if (image->endian == LSBEndian)

        {

          if (GetPixelLuma(image,p) < ((double) QuantumRange/2.0))

            byte|=0x80;

        }

      else

        if (GetPixelLuma(image,p) >= ((double) QuantumRange/2.0))

          byte|=0x80;

      bit++;

      if (bit == 8)

        {

          (void) WriteBlobByte(image,(unsigned char) byte);

          bit=0;

          byte=0;

        }

      p+=(ptrdiff_t) GetPixelChannels(image);

    }

    if (bit != 0)

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

    status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,

      image->rows);

    if (status == MagickFalse)

      break;

  }

  if (CloseBlob(image) == MagickFalse)

    status=MagickFalse;

  return(status);

}