coders/art.c

/*
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%                             AAA   RRRR   TTTTT                              %
%                            A   A  R   R    T                                %
%                            AAAAA  RRRR     T                                %
%                            A   A  R R      T                                %
%                            A   A  R  R     T                                %
%                                                                             %
%                                                                             %
%                 Support PFS: 1st Publisher Clip Art Format                  %
%                                                                             %
%                              Software Design                                %
%                                John Cristy                                  %
%                                 July 1992                                   %
%                                                                             %
%                                                                             %
%  Copyright 1999-2011 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                                            %
%                                                                             %
%    http://www.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 "magick/studio.h"
#include "magick/blob.h"
#include "magick/blob-private.h"
#include "magick/cache.h"
#include "magick/color-private.h"
#include "magick/colormap.h"
#include "magick/colorspace.h"
#include "magick/exception.h"
#include "magick/exception-private.h"
#include "magick/image.h"
#include "magick/image-private.h"
#include "magick/list.h"
#include "magick/magick.h"
#include "magick/memory_.h"
#include "magick/monitor.h"
#include "magick/monitor-private.h"
#include "magick/quantum-private.h"
#include "magick/static.h"
#include "magick/string_.h"
#include "magick/module.h"

/*
  Forward declarations.
*/
static MagickBooleanType
  WriteARTImage(const ImageInfo *,Image *);

/*
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%   R e a d A R T I m a g e                                                   %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  ReadARTImage() reads an image of raw bits 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 ReadARTImage method is:
%
%      Image *ReadARTImage(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 *ReadARTImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
  Image
    *image;

  ssize_t
    y;

  QuantumInfo
    *quantum_info;

  QuantumType
    quantum_type;

  MagickBooleanType
    status;

  ssize_t
    count;

  size_t
    length;

  unsigned char
    *pixels;

  /*
    Open image file.
  */
  assert(image_info != (const ImageInfo *) NULL);
  assert(image_info->signature == MagickSignature);
  if (image_info->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
      image_info->filename);
  assert(exception != (ExceptionInfo *) NULL);
  assert(exception->signature == MagickSignature);
  image=AcquireImage(image_info);
  status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
  if (status == MagickFalse)
    {
      image=DestroyImageList(image);
      return((Image *) NULL);
    }
  image->depth=1;
  image->endian=MSBEndian;
  (void) ReadBlobLSBShort(image);
  image->columns=(size_t) ReadBlobLSBShort(image);
  (void) ReadBlobLSBShort(image);
  image->rows=(size_t) ReadBlobLSBShort(image);
  /*
    Initialize image colormap.
  */
  if (AcquireImageColormap(image,2) == MagickFalse)
    ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
  if (image_info->ping != MagickFalse)
    {
      (void) CloseBlob(image);
      return(GetFirstImageInList(image));
    }
  /*
    Convert bi-level image to pixel packets.
  */
  quantum_type=IndexQuantum;
  quantum_info=AcquireQuantumInfo(image_info,image);
  if (quantum_info == (QuantumInfo *) NULL)
    ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
  pixels=GetQuantumPixels(quantum_info);
  length=GetQuantumExtent(image,quantum_info,quantum_type);
  for (y=0; y < (ssize_t) image->rows; y++)
  {
    register PixelPacket
      *restrict q;

    q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
    if (q == (PixelPacket *) NULL)
      break;
    count=ReadBlob(image,length,pixels);
    if (count != (ssize_t) length)
      ThrowReaderException(CorruptImageError,"UnableToReadImageData");
    (void) ImportQuantumPixels(image,(CacheView *) NULL,quantum_info,
      quantum_type,pixels,exception);
    count=ReadBlob(image,(size_t) (-(ssize_t) length) & 0x01,pixels);
    if (SyncAuthenticPixels(image,exception) == MagickFalse)
      break;
    if (SetImageProgress(image,LoadImageTag,y,image->rows) == MagickFalse)
      break;
  }
  SetQuantumImageType(image,quantum_type);
  quantum_info=DestroyQuantumInfo(quantum_info);
  if (EOFBlob(image) != MagickFalse)
    ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
      image->filename);
  (void) CloseBlob(image);
  return(GetFirstImageInList(image));
}

/*
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%   R e g i s t e r A R T I m a g e                                           %
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%
%  RegisterARTImage() adds attributes for the ART 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 RegisterARTImage method is:
%
%      size_t RegisterARTImage(void)
%
*/
ModuleExport size_t RegisterARTImage(void)
{
  MagickInfo
    *entry;

  entry=SetMagickInfo("ART");
  entry->decoder=(DecodeImageHandler *) ReadARTImage;
  entry->encoder=(EncodeImageHandler *) WriteARTImage;
  entry->raw=MagickTrue;
  entry->adjoin=MagickFalse;
  entry->description=ConstantString("PFS: 1st Publisher Clip Art");
  entry->module=ConstantString("ART");
  (void) RegisterMagickInfo(entry);
  return(MagickImageCoderSignature);
}

/*
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%   U n r e g i s t e r A R T I m a g e                                       %
%                                                                             %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  UnregisterARTImage() removes format registrations made by the
%  ART module from the list of supported formats.
%
%  The format of the UnregisterARTImage method is:
%
%      UnregisterARTImage(void)
%
*/
ModuleExport void UnregisterARTImage(void)
{
  (void) UnregisterMagickInfo("ART");
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
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%   W r i t e A R T I m a g e                                                 %
%                                                                             %
%                                                                             %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  WriteARTImage() writes an image of raw bits in LSB order to a file.
%
%  The format of the WriteARTImage method is:
%
%      MagickBooleanType WriteARTImage(const ImageInfo *image_info,Image *image)
%
%  A description of each parameter follows.
%
%    o image_info: the image info.
%
%    o image:  The image.
%
*/
static MagickBooleanType WriteARTImage(const ImageInfo *image_info,Image *image)
{
  ssize_t
    y;

  MagickBooleanType
    status;

  QuantumInfo
    *quantum_info;

  register const PixelPacket
    *p;

  ssize_t
    count;

  size_t
    length;

  unsigned char
    *pixels;

  /*
    Open output image file.
  */
  assert(image_info != (const ImageInfo *) NULL);
  assert(image_info->signature == MagickSignature);
  assert(image != (Image *) NULL);
  assert(image->signature == MagickSignature);
  if (image->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
  status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
  if (status == MagickFalse)
    return(status);
  if ((image->columns > 65535UL) || (image->rows > 65535UL))
    ThrowWriterException(ImageError,"WidthOrHeightExceedsLimit");
  image->endian=MSBEndian;
  image->depth=1;
  (void) WriteBlobLSBShort(image,0);
  (void) WriteBlobLSBShort(image,(unsigned short) image->columns);
  (void) WriteBlobLSBShort(image,0);
  (void) WriteBlobLSBShort(image,(unsigned short) image->rows);
  if (image->colorspace != RGBColorspace)
    (void) TransformImageColorspace(image,RGBColorspace);
  length=(image->columns+7)/8;
  pixels=(unsigned char *) AcquireQuantumMemory(length,sizeof(*pixels));
  if (pixels == (unsigned char *) NULL)
    ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
  /*
    Convert image to a bi-level image.
  */
  (void) SetImageType(image,BilevelType);
  quantum_info=AcquireQuantumInfo(image_info,image);
  for (y=0; y < (ssize_t) image->rows; y++)
  {
    p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
    if (p == (const PixelPacket *) NULL)
      break;
    (void) ExportQuantumPixels(image,(const CacheView *) NULL,quantum_info,
      GrayQuantum,pixels,&image->exception);
    count=WriteBlob(image,length,pixels);
    if (count != (ssize_t) length)
      ThrowWriterException(CorruptImageError,"UnableToWriteImageData");
    count=WriteBlob(image,(size_t) (-(ssize_t) length) & 0x01,pixels);
    if (SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,image->rows) == MagickFalse)
      break;
  }
  quantum_info=DestroyQuantumInfo(quantum_info);
  pixels=(unsigned char *) RelinquishMagickMemory(pixels);
  (void) CloseBlob(image);
  return(MagickTrue);
}