/*
% Copyright (C) 2003-2018 GraphicsMagick Group
% Copyright (C) 2002 ImageMagick Studio
% Copyright 1991-1999 E. I. du Pont de Nemours and Company
%
% 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.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%                            TTTTT  X   X  TTTTT                              %
%                              T     X X     T                                %
%                              T      X      T                                %
%                              T     X X     T                                %
%                              T    X   X    T                                %
%                                                                             %
%                                                                             %
%                      Render Text Onto A Canvas Image.                       %
%                                                                             %
%                                                                             %
%                              Software Design                                %
%                                John Cristy                                  %
%                                 July 1992                                   %
%                              Jaroslav Fojtik                                %
%                                2009 - 2010                                  %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Patterns accepted:
%     0,0: 129,129,129,255
%     0,0: 129,129,129
%     0,0: (129,129,129) #818181
%     0,0: (3411594072,2774050136,1883729991) #CB58CB58A558A55870477047
%     0,0: (129,129,129,  0)  #81818100  rgba(129,129,129,0)
*/

/*
  Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/pixel_cache.h"
#include "magick/color.h"
#include "magick/constitute.h"
#include "magick/magick.h"
#include "magick/monitor.h"
#include "magick/render.h"
#include "magick/texture.h"
#include "magick/utility.h"

typedef enum
{
  NO_TXT = 0,
  IMAGEMAGICK_TXT = 1,
  TXT_GM8B_HEX,
  TXT_GM8B_PLAIN,
  TXT_GM8B_PLAIN2,
  TXT_GM16B_HEX,
  TXT_GM16B_PLAIN,
  TXT_GM32B_HEX,
  TXT_GM32B_PLAIN,
  IMAGEMAGICK_TXT_Q = 17,
  TXT_GM8B_HEX_Q,
  TXT_GM8B_PLAIN_Q,
  TXT_GM8B_PLAIN2_Q,
  TXT_GM16B_HEX_Q,
  TXT_GM16B_PLAIN_Q,
  TXT_GM32B_HEX_Q,
  TXT_GM32B_PLAIN_Q
} TXT_TYPE;

/*
  Forward declarations.
*/
static unsigned int
  WriteTXTImage(const ImageInfo *,Image *);


/** Reads up to end of line. */
static void readln(Image *image, int *pch)
{
  int
    ch=0;

  if (pch)
    ch=*pch;
  else
    ch=' ';

  while (ch != 10 && ch != 13 && ch != EOF)
    {
      ch = ReadBlobByte(image);
    }
  if (pch)
    *pch=ch;
}

static long ReadInt(Image *image, int *pch)
{
  int
    ch;

  long
    n;

  unsigned int
    digits;

  n=0;
  if (pch)
    ch=*pch;
  else
    ch=' ';

  while (isspace(ch) || ch == 0)
    {
      ch = ReadBlobByte(image);
      if (ch == EOF)
        return (0);
    }

  digits=0;
  while ((digits < 10) && isdigit(ch))
    {
      n=10*n+(ch-'0');
      ch = ReadBlobByte(image);
      if (ch == EOF)
        return (n);
      digits++;
    }

  if (pch)
    *pch=ch;
  /*  else
      ungetc(ch,F); */

  return (n);
}


/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   I s T X T                                                                 %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Method IsTXT returns an enumerated value which indicates the raw TXT
%  image encoding subformat based on the file or blob header.  If the data
%  is not an ASCII encoded raw image, then the value NO_TXT is returned.
%
%  The format of the IsTXT method is:
%
%      TXT_TYPE IsTXT(const unsigned char *magick,const size_t length)
%
%  A description of each parameter follows:
%
%    o status:  Method IsTXT returns a value from the TXT_TYPE enumeration.
%
%    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 TXT_TYPE IsTXT(const unsigned char *magick,const size_t length)
{
  if (length < 20)
    return (NO_TXT);

  {
    unsigned long
      column,
      row;

    unsigned int
      red,
      green,
      blue,
      opacity,
      hex_red,
      hex_green,
      hex_blue,
      hex_opacity;

    int
      count;

    char
      buffer[MaxTextExtent];

    (void) memset((void *)buffer,0,MaxTextExtent);
    (void) memcpy((void *)buffer,(const void *)magick,Min(MaxTextExtent,length));

    if (!strncmp(buffer,"# ImageMagick pixel enumeration:",32))
      return IMAGEMAGICK_TXT;

    count=sscanf(buffer,"%lu,%lu: (%u, %u, %u) #%02X%02X%02X",
                 &column, &row, &red, &green, &blue, &hex_red, &hex_green,
                 &hex_blue);
    if ((count == 8) && (column == 0) && (row == 0) && (red == hex_red) &&
        (green == hex_green) && (blue == hex_blue))
      return (TXT_GM8B_HEX);

    count=sscanf(buffer,"%lu,%lu: (%u, %u, %u) #%04X%04X%04X",
                 &column, &row, &red, &green, &blue, &hex_red, &hex_green,
                 &hex_blue);
    if ((count == 8) && (column == 0) && (row == 0) && (red == hex_red) &&
        (green == hex_green) && (blue == hex_blue))
      return (TXT_GM16B_HEX);

    count=sscanf(buffer,"%lu,%lu: (%u, %u, %u) #%08X%08X%08X",
                 &column, &row, &red, &green, &blue, &hex_red, &hex_green,
                 &hex_blue);
    if ((count == 8) && (column == 0) && (row == 0) && (red == hex_red) &&
        (green == hex_green) && (blue == hex_blue))
      return (TXT_GM32B_HEX);

    count=sscanf(buffer,"%lu,%lu: (%u, %u, %u, %u) #%02X%02X%02X%02X",
                 &column, &row, &red, &green, &blue, &opacity, &hex_red,
                 &hex_green, &hex_blue, &hex_opacity);
    if ((count == 10) && (column == 0) && (row == 0) && (red == hex_red) &&
        (green == hex_green) && (blue == hex_blue) && (opacity == hex_opacity))
      return (TXT_GM8B_HEX_Q);

    count=sscanf(buffer,"%lu,%lu: (%u, %u, %u, %u) #%04X%04X%04X%04X",
                 &column, &row, &red, &green, &blue, &opacity, &hex_red,
                 &hex_green, &hex_blue, &hex_opacity);
    if ((count == 10) && (column == 0) && (row == 0) && (red == hex_red) &&
        (green == hex_green) && (blue == hex_blue) && (opacity == hex_opacity))
      return (TXT_GM16B_HEX_Q);

    count=sscanf(buffer,"%lu,%lu: (%u, %u, %u, %u) #%08X%08X%08X%08X",
                 &column, &row, &red, &green, &blue, &opacity, &hex_red,
                 &hex_green, &hex_blue, &hex_opacity);
    if ((count == 10) && (column == 0) && (row == 0) && (red == hex_red) &&
        (green == hex_green) && (blue == hex_blue) && (opacity == hex_opacity))
      return (TXT_GM32B_HEX_Q);

    count=sscanf(buffer,"%lu,%lu: (%u, %u, %u, %u)",
                 &column, &row, &red, &green, &blue, &opacity);
    if (count==6)
      return TXT_GM8B_PLAIN_Q;

    count=sscanf(buffer,"%lu,%lu: %u, %u, %u, %u",
                 &column, &row, &red, &green, &blue, &opacity);
    if (count==6)
      return TXT_GM8B_PLAIN2_Q;

    count=sscanf(buffer,"%lu,%lu: (%u, %u, %u)",
                 &column, &row, &red, &green, &blue);
    if (count==5)
      return TXT_GM8B_PLAIN;

    count=sscanf(buffer,"%lu,%lu: %u, %u, %u",
                 &column, &row, &red, &green, &blue);
    if (count==5)
      return TXT_GM8B_PLAIN2;

  }
  return (NO_TXT);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   R e a d T X T I m a g e                                                   %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Method ReadTXTImage reads a text file and returns it as an image.  It
%  allocates the memory necessary for the new Image structure and returns a
%  pointer to the new image.
%
%  The format of the ReadTXTImage method is:
%
%      Image *ReadTXTImage(const ImageInfo *image_info,ExceptionInfo *exception)
%
%  A description of each parameter follows:
%
%    o image:  Method ReadTXTImage 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 *ReadTXTImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
  char
    *p,
    text[MaxTextExtent];

  Image
    *image;

  TXT_TYPE
    txt_subformat;

  MagickPassFail
    status;

  MagickBool
    logging;

  /*
    Open image file.
  */
  assert(image_info != (const ImageInfo *) NULL);
  assert(image_info->signature == MagickSignature);
  assert(exception != (ExceptionInfo *) NULL);
  assert(exception->signature == MagickSignature);

  logging = IsEventLogging();
  image=AllocateImage(image_info);
  status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
  if (status == False)
    ThrowReaderException(FileOpenError,UnableToOpenFile,image);

  p = ReadBlobString(image,text);
  if (p == NULL)
    ThrowReaderException(CorruptImageError,ImproperImageHeader,image);
  txt_subformat = IsTXT((unsigned char *)p,strlen(p));

  if (txt_subformat != NO_TXT)
    {
#define ThrowNOTXTReaderException(code_,reason_,image_) \
      do {                                              \
        MagickFreeMemory(BImgBuff);                     \
        ThrowReaderException(code_,reason_,image_);     \
      } while (0);

      unsigned
        x,
        y;

      unsigned
        x_min,
        x_max,
        y_curr;

      int
        ch;

      unsigned long
        max,
        i;

      char
        NumOfPlanes;

      unsigned char
        *BImgBuff=0;

      magick_uint16_t
        *WImgBuff;

      magick_uint32_t
        *DImgBuff;

      magick_uint32_t
        R,
        G,
        B,
        A;

      PixelPacket
        *q;

      ExtendedSignedIntegralType NextImagePos = 0;

      ImportPixelAreaOptions
        import_options;

      if (logging)
        (void) LogMagickEvent(CoderEvent,GetMagickModule(),
                              "File RAW TXT type: %d", (int) txt_subformat);

      do {
        (void) SeekBlob(image,NextImagePos,SEEK_SET);

        if(NextImagePos!=0)
          {
            if (image_info->subrange != 0)
              if (image->scene >= (image_info->subimage+image_info->subrange-1))
                break;

            /* Allocate next image structure. */
            AllocateNextImage(image_info,image);
            if(image->next == (Image *)NULL) break;
            image = SyncNextImageInList(image);
            image->columns = image->rows = 0;
            image->colors=0;
          }

        A=0;
        x=0;
        y=0;
        max=0;

        switch(txt_subformat)
          {
          case TXT_GM8B_HEX:
          case TXT_GM8B_HEX_Q:
            max=255;
            break;
          case TXT_GM16B_HEX:
          case TXT_GM16B_HEX_Q:
            max=65535;
            break;
          case TXT_GM32B_HEX:
          case TXT_GM32B_HEX_Q:
            max=65536;
            break;
          default:
            break;
          }

        /*
          Set opacity flag.
        */
        image->matte=MagickFalse;
        if (txt_subformat >= IMAGEMAGICK_TXT_Q)
          image->matte=MagickTrue;

        if (!strncmp(p,"# ImageMagick pixel enumeration:",32))
          {
            if (sscanf(p+32,"%u,%u,%u",&x_min,&y_curr,&x_max) == 3) /* x_max-x_min+1 x_max=0 x_min=1 */
              {
                if ((x_max == 0) || (x_max < x_min))
                  ThrowReaderException(CorruptImageError,ImproperImageHeader,image);
                if (strstr(p+32,",rgb")!=NULL)
                  {
                    x = x_min-1;
                    y = y_curr-1;
                    max = x_max;
                  }
                if (strstr(p+32,",rgba")!=NULL)
                  {
                    txt_subformat = IMAGEMAGICK_TXT_Q;
                  }
              }
          }

        ch=0;
        if (x == 0 && y == 0)
          while (!EOFBlob(image))       /* auto detect sizes and num of planes */
            {
              while (!(ch >= '0' && ch <= '9'))
                {
                  /* go to the begin of number */
                  ch = ReadBlobByte(image);
                  if (ch == EOF)
                    goto EndReading;
                  if (ch == '#')
                    {
                      readln(image,&ch);
                      continue;
                    }
                  if (ch == 0 || ch > 128 ||
                      (ch >= 'a' && ch <= 'z') ||
                      (ch >= 'A' && ch <= 'Z'))
                    {
                    TXT_FAIL:                   /* not a text data */
                      ThrowNOTXTReaderException(CoderError,ImageTypeNotSupported,image);
                    }
                }
              /* x,y: (R,G,B) */
              x_min = ReadInt(image,&ch);               /* x */
              if (x_min > x)
                x = x_min;

              while (ch != ',')
                {
                  ch = ReadBlobByte(image);
                  if (ch==EOF)
                    break;
                  if (ch == 10 || ch == 13)
                    goto TXT_FAIL;
                }
              ch=0;
              i=ReadInt(image,&ch);             /* y */

              /* Check for next image start. */
              if(x_min==0 && i==0 && x>0 && y>0)
                goto EndReading;

              if (i > y)
                y=i;

              while (ch != ':')
                {
                  ch = ReadBlobByte(image);
                  if (ch == 10 || ch == 13)
                    goto TXT_FAIL;
                  if (ch == EOF)
                    break;
                }
              if (txt_subformat != TXT_GM8B_PLAIN2_Q)
                while (ch != '(')
                  {
                    ch = ReadBlobByte(image);
                    if (ch == 10 || ch == 13)
                      goto TXT_FAIL;
                    if (ch == EOF)
                      break;
                  }
              ch=0;
              R = ReadInt(image,&ch);           /* R */
              if (R > max)
                max=R;

              while (ch != ',')
                {
                  ch = ReadBlobByte(image);
                  if (ch == 10 || ch == 13)
                    goto TXT_FAIL;
                  if (ch == EOF)
                    break;
                }
              ch=0;
              G = ReadInt(image,&ch);           /* G */
              if (G > max)
                max=G;

              while (ch != ',')
                {
                  ch = ReadBlobByte(image);
                  if (ch == 10 || ch == 13)
                    goto TXT_FAIL;
                  if (ch == EOF)
                    break;
                }
              ch=0;
              B = ReadInt(image,&ch);           /* B */
              if (B > max)
                max=B;

              if (txt_subformat >= IMAGEMAGICK_TXT_Q)
                {
                  while (ch != ',')
                    {
                      ch = ReadBlobByte(image);
                      if (ch == 10 || ch == 13)
                        goto TXT_FAIL;
                      if (ch == EOF)
                        break;
                    }
                  ch=0;
                  A = ReadInt(image,&ch);               /* A */
                  if (A > max)
                    max=A;
                }

              if (txt_subformat != TXT_GM8B_PLAIN2_Q)
                while (ch != ')')
                  {
                    ch = ReadBlobByte(image);
                    if (ch == 10 || ch == 13)
                      goto TXT_FAIL;
                    if (ch == EOF)
                      break;
                  }

              readln(image,&ch);
            }

      EndReading:
        x_min = 1;
        x_max = 0;
        y_curr = 0;

        NumOfPlanes=8;
        /*   if (max>=    2) NumOfPlanes=2; */
        /*   if (max>=    4) NumOfPlanes=4; */
        /*   if (max>=   16) NumOfPlanes=8; */
        if (max >=  256)
          NumOfPlanes=16;
        if (max >=65536)
          NumOfPlanes=32;

        if (logging)
          (void)LogMagickEvent(CoderEvent,GetMagickModule(),
                               "Image detected[%lu] [%u * %u]: %d", image->scene, x, y, NumOfPlanes);

        image->depth = Min(QuantumDepth,NumOfPlanes);
        ImportPixelAreaOptionsInit(&import_options);
        import_options.endian = NativeEndian;

        image->columns = x+1;
        image->rows = y+1;
        if (logging)
          (void)LogMagickEvent(CoderEvent,GetMagickModule(),
                               "Image Geometry: %lux%lu", image->columns, image->rows);

        if (CheckImagePixelLimits(image, exception) != MagickPass)
          ThrowNOTXTReaderException(ResourceLimitError,ImagePixelLimitExceeded,image);

        /*
          Validate that file size is sufficient for claimed image properties
        */
        if (BlobIsSeekable(image))
          {
            magick_off_t
              file_size;

            if ((file_size=GetBlobSize(image)) != 0)
              {
                double
                  ratio;

                double
                  packet_size=40.0;  /* Max characters in a row */

                double
                  number_pixels=image->columns*image->rows;

                ratio = (((double) number_pixels*packet_size)/file_size);

                if (ratio > 2.0)
                  {
                    (void) LogMagickEvent(CoderEvent,GetMagickModule(),
                                          "Unreasonable file size "
                                          "(ratio of pixels to file size %g)",
                                          ratio);
                    ThrowReaderException(CorruptImageError,InsufficientImageDataInFile,
                                         image);
                  }
              }
          }

        /* Assure that all image pixels are initialized to black */
        SetImage(image,OpaqueOpacity);

        BImgBuff = MagickAllocateArray(unsigned char *,
                                       (size_t)(x+1),
                                       ( ((image->matte) ? 4 : 3)
                                         * NumOfPlanes/8));
        WImgBuff = (magick_uint16_t *)BImgBuff;
        DImgBuff = (magick_uint32_t *)BImgBuff;
        if (BImgBuff == NULL)
          ThrowNOTXTReaderException(ResourceLimitError,MemoryAllocationFailed,image);


        (void) SeekBlob(image,NextImagePos,SEEK_SET);
        NextImagePos = 0;

        /*
          Load picture data
        */
        while (!EOFBlob(image))
          {
            x=0;
            while (!(ch >= '0' && ch <= '9'))
              {
                /* move to the beginning of number */
                if (EOFBlob(image))
                  goto FINISH;
                ch = ReadBlobByte(image);
                if (ch == '#')
                  {
                    readln(image,&ch);
                    continue;
                  }
                if (ch == 0 || ch > 128 ||	/* Duplicate image check for data with fixed geometry previous check is skipped. */
                      (ch >= 'a' && ch <= 'z') ||
                      (ch >= 'A' && ch <= 'Z'))
                {                                 /* not a text data */
                  ThrowNOTXTReaderException(CoderError,ImageTypeNotSupported,image);
                }
              }

            x = ReadInt(image,&ch);             /* x */

            while (ch != ',')
              {
                ch = ReadBlobByte(image);
                if (ch == EOF)
                  break;
              }
            ch = 0;
            y = ReadInt(image,&ch);             /* y */

            /* New image detected. */
            if(x==0 && y==0 && y_curr>0 && x_max>0)
              {
                NextImagePos = TellBlob(image) - 4;
                break;
              }

            while (ch != ':')
              {
                ch = ReadBlobByte(image);
                if (ch == EOF)
                  break;
              }
            while (ch != '(')
              {
                ch = ReadBlobByte(image);
                if (ch == EOF)
                  break;
              }
            ch=0;
            R = ReadInt(image,&ch);             /* R */

            while (ch != ',')
              {
                ch = ReadBlobByte(image);
                if (ch == EOF)
                  break;
              }
            ch=0;
            G = ReadInt(image,&ch);             /* G */

            while (ch != ',')
              {
                ch = ReadBlobByte(image);
                if (ch == EOF)
                  break;
              }
            ch=0;
            B = ReadInt(image,&ch);             /* B */

            if (image->matte)
              {
                while (ch != ',')
                  {
                    ch = ReadBlobByte(image);
                    if (ch == EOF)
                      break;
                  }
                ch=0;
                A = ReadInt(image,&ch);         /* A */
                if (A > max)
                  max=A;
              }

            while (ch != ')')
              {
                ch = ReadBlobByte(image);
                if (ch == EOF)
                  break;
              }


            /* A new line has been detected */
            if ((y != y_curr) && (x_max >= x_min))
              {
                q = SetImagePixels(image,x_min,y_curr,x_max-x_min+1,1);
                if (q == (PixelPacket *)NULL)
                  break;

                if (image->matte)
                  (void)ImportImagePixelArea(image,RGBAQuantum,NumOfPlanes,
                                             BImgBuff + 4*x_min*(NumOfPlanes/8),
                                             &import_options,0);
                else
                  (void)ImportImagePixelArea(image,RGBQuantum,NumOfPlanes,
                                             BImgBuff + 3*x_min*(NumOfPlanes/8),
                                             &import_options,0);
                if (!SyncImagePixels(image))
                  break;

                x_min = 1;
                x_max = 0;
                y_curr=y;
              }

            if (x < image->columns)
              {
                if (image->matte)
                  {
                    switch(NumOfPlanes)
                      {
                      case 8:
                        BImgBuff[0+4*x] = R;
                        BImgBuff[1+4*x] = G;
                        BImgBuff[2+4*x] = B;
                        BImgBuff[3+4*x] = 255U-A;
                        break;
                      case 16:
                        WImgBuff[0+4*x] = R;
                        WImgBuff[1+4*x] = G;
                        WImgBuff[2+4*x] = B;
                        WImgBuff[3+4*x] = 65535U-A;
                        break;
                      case 32:
                        DImgBuff[0+4*x] = R;
                        DImgBuff[1+4*x] = G;
                        DImgBuff[2+4*x] = B;
                        DImgBuff[3+4*x] = 4294967295U-A;
                        break;
                      }
                  }
                else
                  {
                    switch(NumOfPlanes)
                      {
                      case 8:
                        BImgBuff[0+3*x] = R;
                        BImgBuff[1+3*x] = G;
                        BImgBuff[2+3*x] = B;
                        break;
                      case 16:
                        WImgBuff[0+3*x] = R;
                        WImgBuff[1+3*x] = G;
                        WImgBuff[2+3*x] = B;
                        break;
                      case 32:
                        DImgBuff[0+3*x] = R;
                        DImgBuff[1+3*x] = G;
                        DImgBuff[2+3*x] = B;
                        break;
                      }
                  }
                if (x_min > x_max)
                  {
                    x_max=x_min=x;
                  }
                else
                  {
                    if (x < x_min)
                      x_min=x;
                    if (x > x_max)
                      x_max=x;
                  }
              }

            readln(image,&ch);
          }

      FINISH:
        if (x_min <= x_max)
          {
            q = SetImagePixels(image,x_min,y_curr,x_max-x_min+1,1);
            if (q != (PixelPacket *)NULL)
              {
                if (image->matte)
                  (void)ImportImagePixelArea(image, RGBAQuantum, NumOfPlanes,
                                             BImgBuff + 4*x_min*(NumOfPlanes/8),
                                             &import_options, 0);
                else
                  (void)ImportImagePixelArea(image, RGBQuantum, NumOfPlanes,
                                             BImgBuff + 3*x_min*(NumOfPlanes/8),
                                             &import_options, 0);
                if (!SyncImagePixels(image))
                  {
                    if (logging)
                      (void)LogMagickEvent(CoderEvent,GetMagickModule(),
                                           "  TXT failed to sync image pixels for a row %u", y_curr);
                  }

              }
          }
        /* Note that DImgBuff and WImgBuff point to BImgBuff */
        MagickFreeMemory(BImgBuff);
      } while(!EOFBlob(image) && NextImagePos>0);

      goto FINISH_TXT;
    }

  {
    /*
      Render arbitrary ASCII text as image.
    */
    char
      filename[MaxTextExtent],
      geometry[MaxTextExtent];

    double
      dx_resolution,
      dy_resolution;

    Image
      *texture = (Image *) NULL;

    long
      count,
      line_num,
      lines_per_page,
      margins,
      page_num,
      pixels_per_line;

    DrawInfo
      *draw_info = (DrawInfo *) NULL;

    RectangleInfo
      page;

    TypeMetric
      metrics;

    /*
      Set the page geometry.
    */
    dx_resolution=72.0;
    dy_resolution=72.0;
    if ((image->x_resolution == 0.0) || (image->y_resolution == 0.0))
      {
        char
          density[MaxTextExtent];

        (void) strlcpy(density,PSDensityGeometry,sizeof(density));
        count=GetMagickDimension(density,&image->x_resolution,
                                 &image->y_resolution,NULL,NULL);
        if (count != 2)
          image->y_resolution=image->x_resolution;
      }
    SetGeometry(image,&page);
    page.width=612;
    page.height=792;
    (void) GetGeometry("612x792+43+43",&page.x,&page.y,&page.width,&page.height);
    if (image_info->page != (char *) NULL)
      (void) GetGeometry(image_info->page,&page.x,&page.y,&page.width,
                         &page.height);
    if (logging)
      (void)LogMagickEvent(CoderEvent,GetMagickModule(),
                           "Page Geometry: %lux%lu%+ld%+ld",
                           page.width,page.height,page.x,page.y);
    /*
      Initialize Image structure.
    */
    image->columns=(unsigned long)
      ceil(((page.width*image->x_resolution)/dx_resolution)-0.5);
    image->rows=(unsigned long)
      ceil(((page.height*image->y_resolution)/dy_resolution)-0.5);

    if (CheckImagePixelLimits(image, exception) != MagickPass)
      ThrowReaderException(ResourceLimitError,ImagePixelLimitExceeded,image);

    texture=(Image *) NULL;
    if (image_info->texture != (char *) NULL)
      {
        ImageInfo
          *clone_info;

        clone_info=CloneImageInfo(image_info);
        clone_info->blob=(void *) NULL;
        clone_info->length=0;
        (void) strlcpy(clone_info->filename,image_info->texture,MaxTextExtent);
        texture=ReadImage(clone_info,exception);
        DestroyImageInfo(clone_info);
      }
    /*
      Annotate the text image.
    */
    (void) SetImageEx(image,OpaqueOpacity,exception);
    draw_info=CloneDrawInfo(image_info,(DrawInfo *) NULL);
    draw_info->fill=image_info->pen;
    (void) CloneString(&draw_info->text,image_info->filename);
    FormatString(geometry,"0x0%+ld%+ld",page.x,page.y);
    (void) CloneString(&draw_info->geometry,geometry);
    status=GetTypeMetrics(image,draw_info,&metrics);
    if (status == False)
      {
        if (texture != (Image *) NULL)
          DestroyImage(texture);
        DestroyDrawInfo(draw_info);
        ThrowReaderException(TypeError,UnableToGetTypeMetrics,image);
      }
    if (logging)
      (void)LogMagickEvent(CoderEvent,GetMagickModule(),
                           "Type metrics: ascent=%g descent=%g"
                           " height=%g max_advance=%g",
                           metrics.ascent,metrics.descent,
                           metrics.height,metrics.max_advance);
    pixels_per_line=(long) (metrics.ascent-metrics.descent);
    margins=2*page.y;
    lines_per_page=((image->rows+1)-margins)/pixels_per_line+1;
    if (logging)
      (void)LogMagickEvent(CoderEvent,GetMagickModule(),
                           "Pixels per line: %ld",
                           pixels_per_line);
    if (logging)
      (void)LogMagickEvent(CoderEvent,GetMagickModule(),
                           "Lines per page: %ld",
                           lines_per_page);
    (void) strlcpy(filename,image_info->filename,MaxTextExtent);
    if (draw_info->text != NULL)
      *draw_info->text='\0';

    page_num=1;
    line_num=0;
    while (p != (char *) NULL)
      {
        /*
          Annotate image with text.

          Text lines are concatenated so that a full page is
          rendered at a time via AnnotateImage().
        */
        (void) ConcatenateString(&draw_info->text,text);
        (void) ConcatenateString(&draw_info->text,"\n");
        line_num++;

        if (image->previous == (Image *) NULL)
          if (QuantumTick(line_num,lines_per_page))
            if (!MagickMonitorFormatted(line_num,lines_per_page,&image->exception,
                                        LoadImageText,image->filename,
                                        image->columns,image->rows))
              break;

        p=ReadBlobString(image,text);
        if ((line_num < lines_per_page) && (p != (char *) NULL))
          continue;
        if (texture != (Image *) NULL)
          {
            MonitorHandler
              handler;

            handler=SetMonitorHandler((MonitorHandler) NULL);
            (void) TextureImage(image,texture);
            (void) SetMonitorHandler(handler);
          }
        (void) AnnotateImage(image,draw_info);
        if (p == (char *) NULL)
          break;

        if (logging)
          (void)LogMagickEvent(CoderEvent,GetMagickModule(),
                               "page %ld scene %ld ",page_num, image->scene);

        if ((image_info->subimage != 0) || (image_info->subrange != 0))
          if (image->scene >= (image_info->subimage+image_info->subrange-1))
            break;

        /*
          Page is full-- allocate next image structure.
        */
        *draw_info->text='\0';
        page_num++;
        line_num=0;
        AllocateNextImage(image_info,image);
        if (image->next == (Image *) NULL)
          {
            DestroyDrawInfo(draw_info);
            DestroyImageList(image);
            return ((Image *) NULL);
          }
        image->next->columns=image->columns;
        image->next->rows=image->rows;
        image=SyncNextImageInList(image);
        (void) strlcpy(image->filename,filename,MaxTextExtent);
        (void) SetImage(image,OpaqueOpacity);
        if (!MagickMonitorFormatted(TellBlob(image),GetBlobSize(image),exception,
                                    LoadImagesText,image->filename))
          break;
      }

    if (texture != (Image *) NULL)
      {
        MonitorHandler
          handler;

        handler=SetMonitorHandler((MonitorHandler) NULL);
        (void) TextureImage(image,texture);
        (void) SetMonitorHandler(handler);
      }
    (void) AnnotateImage(image,draw_info);
    if (texture != (Image *) NULL)
      DestroyImage(texture);
    DestroyDrawInfo(draw_info);
  }

 FINISH_TXT:
  CloseBlob(image);
  {
    Image *p;
    long scene=0;

    /*
      Rewind list, removing any empty images while rewinding.
    */
    p=image;
    image=NULL;
    while(p != (Image *) NULL)
      {
        Image *tmp=p;
        if ((p->rows == 0) || (p->columns == 0)) {
          p=p->previous;
          DeleteImageFromList(&tmp);
        } else {
          image=p;
          p=p->previous;
        }
      }

    /*
      Fix scene numbers
    */
    for(p=image; p != (Image *)NULL; p=p->next)
      p->scene=scene++;
  }

  if(logging) (void)LogMagickEvent(CoderEvent,GetMagickModule(),"return");
  return (image);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   R e g i s t e r T X T I m a g e                                           %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Method RegisterTXTImage adds attributes for the TXT 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 RegisterTXTImage method is:
%
%      RegisterTXTImage(void)
%
*/
ModuleExport void RegisterTXTImage(void)
{
  MagickInfo
    *entry;

  entry=SetMagickInfo("TEXT");
  entry->decoder=(DecoderHandler) ReadTXTImage;
  entry->encoder=(EncoderHandler) WriteTXTImage;
  entry->raw=MagickTrue;
  entry->description="ASCII Text";
  entry->module="TXT";
  (void) RegisterMagickInfo(entry);

  entry=SetMagickInfo("TXT");
  entry->decoder=(DecoderHandler) ReadTXTImage;
  entry->encoder=(EncoderHandler) WriteTXTImage;
  entry->seekable_stream=MagickTrue;
  entry->description="ASCII Text";
  entry->module="TXT";
  (void) RegisterMagickInfo(entry);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   U n r e g i s t e r T X T I m a g e                                       %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Method UnregisterTXTImage removes format registrations made by the
%  TXT module from the list of supported formats.
%
%  The format of the UnregisterTXTImage method is:
%
%      UnregisterTXTImage(void)
%
*/
ModuleExport void UnregisterTXTImage(void)
{
  (void) UnregisterMagickInfo("TEXT");
  (void) UnregisterMagickInfo("TXT");
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   W r i t e T X T I m a g e                                                 %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Method WriteTXTImage writes the pixel values as text numbers.
%
%  The format of the WriteTXTImage method is:
%
%      unsigned int WriteTXTImage(const ImageInfo *image_info,Image *image)
%
%  A description of each parameter follows.
%
%    o status: Method WriteTXTImage return MagickTrue 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 WriteTXTImage(const ImageInfo *image_info,Image *image)
{
  char
    buffer[MaxTextExtent],
    tuple[MaxTextExtent];

  long
    y;

  register const PixelPacket
    *p;

  register long
    x;

  size_t
    image_list_length;

  unsigned int
    status;

  unsigned long
    scene;

  /*
    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,WriteBlobMode,&image->exception);
  if (status == False)
    ThrowWriterException(FileOpenError,UnableToOpenFile,image);
  scene=0;
  image_list_length=GetImageListLength(image);
  do
    {
      unsigned int
        depth;

      (void) TransformColorspace(image,RGBColorspace);
      if (image->depth <= 8)
        depth=8;
      else if (image->depth <= 16)
        depth=16;
      else
        depth=32;

      if ((AccessDefinition(image_info,"txt","with-im-header")))
        {
          /* Write ImageMagick txt header */

          unsigned char a = image->matte ? 'a' : ' ';

          FormatString(buffer,
                       "# ImageMagick pixel enumeration: %.20g,%.20g,%.20g,rgb%c\n",
                       (double) image->columns, (double) image->rows, (double) depth, a);

          (void) WriteBlobString(image,buffer);
        }

      /*
        Convert MIFF to TXT raster pixels.
      */
      for (y=0; y < (long) image->rows; y++)
        {
          p=AcquireImagePixels(image,0,y,image->columns,1,&image->exception);
          if (p == (const PixelPacket *) NULL)
            break;
          for (x=0; x < (long) image->columns; x++)
            {
              FormatString(buffer,"%ld,%ld: ",x,y);
              (void) WriteBlobString(image,buffer);
              GetColorTuple(p,depth,image->matte,MagickFalse,tuple);
              (void) strlcat(tuple," ",sizeof(tuple));
              (void) WriteBlobString(image,tuple);
              /* (void) QueryColorname(image,p,SVGCompliance,tuple,&image->exception); */
              GetColorTuple(p,depth,image->matte,MagickTrue,tuple);
              (void) WriteBlobString(image,tuple);
              (void) WriteBlobString(image,"\n");
              p++;
            }
        }
      if (image->next == (Image *) NULL)
        break;
      image=SyncNextImageInList(image);
      status=MagickMonitorFormatted(scene,image_list_length,
                                    &image->exception,SaveImagesText,
                                    image->filename);
      if (status == False)
        break;
      scene++;
    } while (image_info->adjoin);
  if (image_info->adjoin)
    while (image->previous != (Image *) NULL)
      image=image->previous;
  CloseBlob(image);
  return (MagickTrue);
}
