/*

% Copyright (C) 2009-2025 GraphicsMagick Group

%

% 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.

%

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

%                                                                             %

%                                                                             %

%                            H   H  RRRR   ZZZZZ                              %

%                            H   H  R   R     ZZ                              %

%                            HHHHH  RRRR     Z                                %

%                            H   H  R R    ZZ                                 %

%                            H   H  R  R   ZZZZZ                              %

%                                                                             %

%                                                                             %

%                               Slow scan TV.                                 %

%                                                                             %

%                                                                             %

%                              Software Design                                %

%                              Jaroslav Fojtik                                %

%                                 2009-2024                                   %

%                                                                             %

%                                                                             %

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

%

%

*/

/*

  Include declarations.

*/

#include "magick/studio.h"

#include "magick/blob.h"

#include "magick/pixel_cache.h"

#include "magick/log.h"

#include "magick/magick.h"

#include "magick/monitor.h"

#include "magick/resize.h"

#include "magick/utility.h"

#include "magick/constitute.h"

#include "magick/static.h"

/*

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

%                                                                             %

%                                                                             %

%                                                                             %

%   R e a d H R Z I m a g e                                                   %

%                                                                             %

%                                                                             %

%                                                                             %

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

%

%  Method ReadHRZImage reads an HRZ 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 ReadHRZImage method is:

%

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

%

%  A description of each parameter follows:

%

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

{

  Image *image;

  unsigned char *BImgBuff;

  const PixelPacket *q;

  size_t ldblk;

  unsigned long x,y,width,height;

  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);

  /*

    Read HRZ image.

  */

  width = 256;

  height = 240;

  ldblk = 3*width;

  if (BlobIsSeekable(image))

    {

      if (GetBlobSize(image) != ((magick_off_t) ((size_t)ldblk*height)))

        ThrowReaderException(CorruptImageError,ImproperImageHeader,image);

    }

  image->columns = width;

  image->rows = height;

  image->depth = 8;

  /* printf("HRZ header checked OK %d,%d\n",image->colors,image->depth); */

  /* If ping is true, then only set image size without reading any image data. */

  if (image_info->ping)

    goto DONE_READING;

  /* ----- Load packed raster ----- */

  BImgBuff=MagickAllocateResourceLimitedMemory(unsigned char *, ldblk);

  if (BImgBuff==NULL)

    ThrowReaderException(ResourceLimitError,MemoryAllocationFailed,image);

  for (y=0; y < height; y++)

    {

      if (ReadBlob(image,ldblk,(char *)BImgBuff) != ldblk)

        break;

      for (x=0; x < ldblk; x++)

        {

          BImgBuff[x] <<= 2;

        }

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

      if (q == (PixelPacket *)NULL)

        break;

      (void) ImportImagePixelArea(image,RGBQuantum,8,BImgBuff,NULL,0);

      if (!SyncImagePixels(image))

        break;

    }

  if (BImgBuff!=NULL)

    MagickFreeResourceLimitedMemory(unsigned char *,BImgBuff);

  if ((y != height) || EOFBlob(image))

    ThrowReaderException(CorruptImageError, UnexpectedEndOfFile, image);

 DONE_READING:

  CloseBlob(image);

  StopTimer(&image->timer);

  return(image);

}

/*

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

%                                                                             %

%                                                                             %

%                                                                             %

%   W r i t e H R Z I m a g e                                                 %

%                                                                             %

%                                                                             %

%                                                                             %

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

%

%  WriteHRZImage() writes an image to a file in HRZ image format.

%

%  The format of the WriteHRZImage method is:

%

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

{

  int logging;

  Image *hrz_image;

  unsigned status;

  unsigned long x, y;

  ssize_t count;

  unsigned char *pixels, *q;

  /*

    Open output image file.

  */

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

  assert(image_info->signature == MagickSignature);

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

  assert(image->signature == MagickSignature);

  assert(image->exception.signature == MagickSignature);

  logging = LogMagickEvent(CoderEvent,GetMagickModule(),"enter HRZ");

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

  if (status == MagickFail)

    ThrowWriterException(FileOpenError,UnableToOpenFile,image);

  hrz_image = ResizeImage(image,256,240,image->filter,1.0,&image->exception);

  if (hrz_image == (Image *)NULL)

    {

      CloseBlob(image);

      return(MagickFalse);

    }

  /*

    Allocate memory for pixels.

  */

  pixels = MagickAllocateResourceLimitedClearedArray(unsigned char *,

                                                     (size_t)hrz_image->columns,3*sizeof(*pixels));

  if (pixels == (unsigned char *) NULL)

    {

      DestroyImage(hrz_image);

      ThrowWriterException(ResourceLimitError,MemoryAllocationFailed,image);

    }

  /*

    Convert MIFF to HRZ raster pixels.

  */

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

    {

      if (AcquireImagePixels(image,0,y,image->columns,1,&image->exception) == (const PixelPacket *)NULL)

        {

          status=MagickFail;

          break;

        }

      if (ExportImagePixelArea(image,RGBQuantum,8,pixels,0,0) != MagickPass)

        {

          status = MagickFail;

          break;

        }

      q = pixels;

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

        {

          *q++ /= 4;

          *q++ /= 4;

          *q++ /= 4;

        }

      count = WriteBlob(image,(size_t) (q-pixels),pixels);

      if (count != (ssize_t)(q-pixels))

        {

          status = MagickFail;

          break;

        }

      /* status = SetImageProgress(image,SaveImageTag,y,hrz_image->rows);

         if (status == MagickFalse)

         break; */

    }

  MagickFreeResourceLimitedMemory(unsigned char *,pixels);

  DestroyImage(hrz_image);

  status &= CloseBlob(image);

  if (logging)

    (void)LogMagickEvent(CoderEvent,GetMagickModule(),"return HRZ");

  return(status);

}

/*

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

%                                                                             %

%                                                                             %

%                                                                             %

%   R e g i s t e r H R Z I m a g e                                           %

%                                                                             %

%                                                                             %

%                                                                             %

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

%

%  Method RegisterHRZImage adds attributes for the HRZ 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 RegisterHRZImage method is:

%

%      RegisterHRZImage(void)

%

*/

ModuleExport void RegisterHRZImage(void)

{

  MagickInfo

    *entry;

  entry=SetMagickInfo("HRZ");

  entry->decoder = (DecoderHandler)ReadHRZImage;

  entry->encoder = (EncoderHandler)WriteHRZImage;

  entry->seekable_stream = MagickFalse;

  entry->description="HRZ: Slow scan TV";

  entry->module="HRZ";

  entry->adjoin=MagickFalse;

  (void) RegisterMagickInfo(entry);

}

/*

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

%                                                                             %

%                                                                             %

%                                                                             %

%   U n r e g i s t e r H R Z I m a g e                                       %

%                                                                             %

%                                                                             %

%                                                                             %

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

%

%  Method UnregisterHRZImage removes format registrations made by the

%  HRZ module from the list of supported formats.

%

%  The format of the UnregisterHRZImage method is:

%

%      UnregisterHRZImage(void)

%

*/

ModuleExport void UnregisterHRZImage(void)

{

  (void) UnregisterMagickInfo("HRZ");

}