File: sct.c

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/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%                            SSSSS   CCCC  TTTTT                              %
%                            SS     C        T                                %
%                             SSS   C        T                                %
%                               SS  C        T                                %
%                            SSSSS   CCCC    T                                %
%                                                                             %
%                                                                             %
%                    Read/Write ImageMagick Image Format.                     %
%                                                                             %
%                                                                             %
%                              Software Design                                %
%                                John Cristy                                  %
%                                 July 1992                                   %
%                                                                             %
%                                                                             %
%  Copyright (C) 2002 ImageMagick Studio, a non-profit organization dedicated %
%  to making software imaging solutions freely available.                     %
%                                                                             %
%  Permission is hereby granted, free of charge, to any person obtaining a    %
%  copy of this software and associated documentation files ("ImageMagick"),  %
%  to deal in ImageMagick without restriction, including without limitation   %
%  the rights to use, copy, modify, merge, publish, distribute, sublicense,   %
%  and/or sell copies of ImageMagick, and to permit persons to whom the       %
%  ImageMagick is furnished to do so, subject to the following conditions:    %
%                                                                             %
%  The above copyright notice and this permission notice shall be included in %
%  all copies or substantial portions of ImageMagick.                         %
%                                                                             %
%  The software is provided "as is", without warranty of any kind, express or %
%  implied, including but not limited to the warranties of merchantability,   %
%  fitness for a particular purpose and noninfringement.  In no event shall   %
%  ImageMagick Studio be liable for any claim, damages or other liability,    %
%  whether in an action of contract, tort or otherwise, arising from, out of  %
%  or in connection with ImageMagick or the use or other dealings in          %
%  ImageMagick.                                                               %
%                                                                             %
%  Except as contained in this notice, the name of the ImageMagick Studio     %
%  shall not be used in advertising or otherwise to promote the sale, use or  %
%  other dealings in ImageMagick without prior written authorization from the %
%  ImageMagick Studio.                                                        %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/

/*
  Include declarations.
*/
#include "magick.h"
#include "define.h"

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   I s S C T                                                                 %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Method IsSCT returns True if the image format type, identified by the
%  magick string, is SCT.
%
%  The format of the IsSCT method is:
%
%      unsigned int IsSCT(const unsigned char *magick,const size_t length)
%
%  A description of each parameter follows:
%
%    o status:  Method IsSCT returns True if the image format type is SCT.
%
%    o magick: This string is generally the first few bytes of an image file
%      or blob.
%
%    o length: Specifies the length of the magick string.
%
%
*/
static unsigned int IsSCT(const unsigned char *magick,const size_t length)
{
  if (length < 2)
    return(False);
  if (LocaleNCompare((char *) magick,"CT",2) == 0)
    return(True);
  return(False);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   R e a d S C T I m a g e                                                   %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Method ReadSCTImage reads a Scitex image file 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 ReadSCTImage method is:
%
%      Image *ReadSCTImage(const ImageInfo *image_info,ExceptionInfo *exception)
%
%  A description of each parameter follows:
%
%    o image:  Method ReadSCTImage 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 an ImageInfo structure.
%
%    o exception: return any errors or warnings in this structure.
%
%
*/
static Image *ReadSCTImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
  char
    buffer[768],
    magick[2];

  Image
    *image;

  long
    y;

  register long
    x;

  register PixelPacket
    *q;

  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,ReadBinaryType,exception);
  if (status == False)
    ThrowReaderException(FileOpenWarning,"Unable to open file",image);
  /*
    Read control block.
  */
  (void) ReadBlob(image,80,(char *) buffer);
  (void) ReadBlob(image,2,(char *) magick);
  if ((LocaleNCompare((char *) magick,"CT",2) != 0) &&
      (LocaleNCompare((char *) magick,"LW",2) != 0) &&
      (LocaleNCompare((char *) magick,"BM",2) != 0) &&
      (LocaleNCompare((char *) magick,"PG",2) != 0) &&
      (LocaleNCompare((char *) magick,"TX",2) != 0))
    ThrowReaderException(CorruptImageWarning,"Not a SCT image file",image);
  if ((LocaleNCompare((char *) magick,"LW",2) == 0) ||
      (LocaleNCompare((char *) magick,"BM",2) == 0) ||
      (LocaleNCompare((char *) magick,"PG",2) == 0) ||
      (LocaleNCompare((char *) magick,"TX",2) == 0))
    ThrowReaderException(CorruptImageWarning,
      "only Continuous Tone Picture supported",image);
  (void) ReadBlob(image,174,(char *) buffer);
  (void) ReadBlob(image,768,(char *) buffer);
  /*
    Read paramter block.
  */
  (void) ReadBlob(image,32,(char *) buffer);
  (void) ReadBlob(image,14,(char *) buffer);
  image->rows=atol(buffer);
  (void) ReadBlob(image,14,(char *) buffer);
  image->columns=atol(buffer);
  (void) ReadBlob(image,196,(char *) buffer);
  (void) ReadBlob(image,768,(char *) buffer);
  image->colorspace=CMYKColorspace;
  if (image_info->ping)
    {
      CloseBlob(image);
      return(image);
    }
  /*
    Convert SCT raster 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;
    for (x=0; x < (long) image->columns; x++)
    {
      q->red=(Quantum) (MaxRGB-Upscale(ReadBlobByte(image)));
      q++;
    }
    if ((image->columns % 2) != 0)
      (void) ReadBlobByte(image);  /* pad */
    q=GetImagePixels(image,0,y,image->columns,1);
    if (q == (PixelPacket *) NULL)
      break;
    for (x=0; x < (long) image->columns; x++)
    {
      q->green=(Quantum) (MaxRGB-Upscale(ReadBlobByte(image)));
      q++;
    }
    if ((image->columns % 2) != 0)
      (void) ReadBlobByte(image);  /* pad */
    q=GetImagePixels(image,0,y,image->columns,1);
    if (q == (PixelPacket *) NULL)
      break;
    for (x=0; x < (long) image->columns; x++)
    {
      q->blue=(Quantum) (MaxRGB-Upscale(ReadBlobByte(image)));
      q++;
    }
    if ((image->columns % 2) != 0)
      (void) ReadBlobByte(image);  /* pad */
    q=GetImagePixels(image,0,y,image->columns,1);
    if (q == (PixelPacket *) NULL)
      break;
    for (x=0; x < (long) image->columns; x++)
    {
      q->opacity=(Quantum) (MaxRGB-Upscale(ReadBlobByte(image)));
      q++;
    }
    if (!SyncImagePixels(image))
      break;
    if ((image->columns % 2) != 0)
      (void) ReadBlobByte(image);  /* pad */
    if (QuantumTick(y,image->rows))
      MagickMonitor(LoadImageText,y,image->rows);
  }
  if (EOFBlob(image))
    ThrowReaderException(CorruptImageWarning,"Unexpected end-of-file",image);
  CloseBlob(image);
  return(image);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   R e g i s t e r S C T I m a g e                                           %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Method RegisterSCTImage adds attributes for the SCT 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 RegisterSCTImage method is:
%
%      RegisterSCTImage(void)
%
*/
ModuleExport void RegisterSCTImage(void)
{
  MagickInfo
    *entry;

  entry=SetMagickInfo("SCT");
  entry->decoder=ReadSCTImage;
  entry->magick=IsSCT;
  entry->adjoin=False;
  entry->description=AcquireString("Scitex HandShake");
  entry->module=AcquireString("SCT");
  (void) RegisterMagickInfo(entry);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   U n r e g i s t e r S C T I m a g e                                       %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Method UnregisterSCTImage removes format registrations made by the
%  SCT module from the list of supported formats.
%
%  The format of the UnregisterSCTImage method is:
%
%      UnregisterSCTImage(void)
%
*/
ModuleExport void UnregisterSCTImage(void)
{
  (void) UnregisterMagickInfo("SCT");
}