/*

% Copyright (C) 2019-2026 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.

%

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

%                                                                             %

%                                                                             %

%               BBBB   RRRR    AAA   IIIII  L      L      EEEEE               %

%               B   B  R   R  A   A    I    L      L      E                   %

%               BBBB   RRRR   AAAAA    I    L      L      EEE                 %

%               B   B  R R    A   A    I    L      L      E                   %

%               BBBB   R  R   A   A  IIIII  LLLLL  LLLLL  EEEEE               %

%                                                                             %

%                                                                             %

%                          Read/Write Braille Format                          %

%                                                                             %

%                               Samuel Thibault                               %

%                                February 2008                                %

%                                                                             %

%                                                                             %

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

%

%

*/

/*

  Include declarations.

*/

#include "magick/studio.h"

#include "magick/blob.h"

#include "magick/magick.h"

#include "magick/pixel_cache.h"

#include "magick/utility.h"

#include "magick/static.h"

/*

  Forward declarations.

*/

static unsigned int

  WriteBRAILLEImage(const ImageInfo *,Image *);

/*

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

%                                                                             %

%                                                                             %

%                                                                             %

%   R e g i s t e r B R A I L L E I m a g e                                   %

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%                                                                             %

%                                                                             %

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

%

%  RegisterBRAILLEImage() adds values for the Braille format to

%  the list of supported formats.  The values 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 RegisterBRAILLEImage method is:

%

%      size_t RegisterBRAILLEImage(void)

%

*/

ModuleExport void RegisterBRAILLEImage(void)

{

  MagickInfo

    *entry;

  entry=SetMagickInfo("BRF");

  entry->encoder=(EncoderHandler) WriteBRAILLEImage;

  entry->adjoin=False;

  entry->description="BRF ASCII Braille format";

  entry->module="BRAILLE";

  (void) RegisterMagickInfo(entry);

  entry=SetMagickInfo("UBRL");

  entry->encoder=(EncoderHandler) WriteBRAILLEImage;

  entry->adjoin=False;

  entry->description="Unicode Text format";

  entry->module="BRAILLE";

  (void) RegisterMagickInfo(entry);

  entry=SetMagickInfo("UBRL6");

  entry->encoder=(EncoderHandler) WriteBRAILLEImage;

  entry->adjoin=False;

  entry->description="Unicode Text format 6dot";

  entry->module="BRAILLE";

  (void) RegisterMagickInfo(entry);

  entry=SetMagickInfo("ISOBRL");

  entry->encoder=(EncoderHandler) WriteBRAILLEImage;

  entry->adjoin=False;

  entry->description="ISO/TR 11548-1 format";

  entry->module="BRAILLE";

  (void) RegisterMagickInfo(entry);

  entry=SetMagickInfo("ISOBRL6");

  entry->encoder=(EncoderHandler) WriteBRAILLEImage;

  entry->adjoin=False;

  entry->description="ISO/TR 11548-1 format 6dot";

  entry->module="BRAILLE";

  (void) RegisterMagickInfo(entry);

}

/*

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

%                                                                             %

%                                                                             %

%                                                                             %

%   U n r e g i s t e r B R A I L L E I m a g e                               %

%                                                                             %

%                                                                             %

%                                                                             %

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

%

%  UnregisterBRAILLEImage() removes format registrations made by the

%  BRAILLE module from the list of supported formats.

%

%  The format of the UnregisterBRAILLEImage method is:

%

%      UnregisterBRAILLEImage(void)

%

*/

ModuleExport void UnregisterBRAILLEImage(void)

{

  (void) UnregisterMagickInfo("BRF");

  (void) UnregisterMagickInfo("UBRL");

  (void) UnregisterMagickInfo("UBRL6");

  (void) UnregisterMagickInfo("ISOBRL");

  (void) UnregisterMagickInfo("ISOBRL6");

}

/*

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

%                                                                             %

%                                                                             %

%                                                                             %

%   W r i t e B R A I L L E I m a g e                                         %

%                                                                             %

%                                                                             %

%                                                                             %

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

%

%  WriteBRAILLEImage() writes an image to a file in the Braille format.

%

%  The format of the WriteBRAILLEImage method is:

%

%      unsigned int WriteBRAILLEImage(const ImageInfo *image_info,

%        Image *image)

%

%  A description of each parameter follows.

%

%    o image_info: The image info.

%

%    o image:  The image.

%

*/

static unsigned int WriteBRAILLEImage(const ImageInfo *image_info,

  Image *image)

{

  char

    buffer[MaxTextExtent];

  IndexPacket

    polarity;

  int

    unicode = 0,

    iso_11548_1 = 0;

  MagickPassFail

    status = MagickPass;

  register const IndexPacket

    *indexes;

  register const PixelPacket

    *p;

  register unsigned long

    x;

  unsigned long

    cell_height = 4;

  unsigned long

    y;

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

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

  if (SetImageType(image,BilevelType) == MagickFail)

    ThrowWriterException(CoderError,UnableToSetImageType,image);

  /*

    Open output image file.

  */

  if (LocaleCompare(image_info->magick,"UBRL") == 0)

    unicode=1;

  else if (LocaleCompare(image_info->magick,"UBRL6") == 0)

    {

      unicode=1;

      cell_height=3;

    }

  else if (LocaleCompare(image_info->magick,"ISOBRL") == 0)

    iso_11548_1=1;

  else if (LocaleCompare(image_info->magick,"ISOBRL6") == 0)

    {

      iso_11548_1=1;

      cell_height=3;

    }

  else

    cell_height=3;

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

  if (status == False)

    return(status);

  if (!iso_11548_1)

    {

      if (image->page.x != 0)

        {

          (void) MagickFormatString(buffer,sizeof(buffer),"X: %.20g\n",(double)

            image->page.x);

          (void) WriteBlobString(image,buffer);

        }

      if (image->page.y != 0)

        {

          (void) MagickFormatString(buffer,sizeof(buffer),"Y: %.20g\n",(double)

            image->page.y);

          (void) WriteBlobString(image,buffer);

        }

      (void) MagickFormatString(buffer,sizeof(buffer),"Width: %.20g\n",(double)

        image->columns+(image->columns % 2));

      (void) WriteBlobString(image,buffer);

      (void) MagickFormatString(buffer,sizeof(buffer),"Height: %.20g\n",(double)

        image->rows);

      (void) WriteBlobString(image,buffer);

      (void) WriteBlobString(image,"\n");

    }

  polarity=PixelIntensityToQuantum(&image->colormap[0]) >= (MaxRGB/2);

  if (image->colors == 2)

    polarity=PixelIntensityToQuantum(&image->colormap[0]) >=

      PixelIntensityToQuantum(&image->colormap[1]);

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

  {

    if ((y+cell_height) > image->rows)

      cell_height = (image->rows-y);

    p=AcquireImagePixels(image,0,y,image->columns,cell_height,&image->exception);

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

      break;

    indexes=AccessImmutableIndexes(image);

    for (x=0; x < image->columns; x+=2)

    {

      unsigned char cell = 0;

      unsigned long two_columns = x+1 < image->columns;

      do

      {

#define do_cell(dx,dy,bit) do { \

        cell |= (indexes[x+dx+dy*image->columns] == polarity) << bit; \

} while (0)

        do_cell(0,0,0);

        if (two_columns)

          do_cell(1,0,3);

        if (cell_height < 2)

          break;

        do_cell(0,1,1);

        if (two_columns)

          do_cell(1,1,4);

        if (cell_height < 3)

          break;

        do_cell(0,2,2);

        if (two_columns)

          do_cell(1,2,5);

        if (cell_height < 4)

          break;

        do_cell(0,3,6);

        if (two_columns)

          do_cell(1,3,7);

      } while(0);

      if (unicode)

        {

          unsigned char utf8[3];

          /* Unicode text */

          utf8[0] = (unsigned char) (0xe0|((0x28>>4)&0x0f));

          utf8[1] = 0x80|((0x28<<2)&0x3f)|(cell>>6);

          utf8[2] = 0x80|(cell&0x3f);

          (void) WriteBlob(image,3,utf8);

        }

      else if (iso_11548_1)

        {

          /* ISO/TR 11548-1 binary */

          (void) WriteBlobByte(image,cell);

        }

      else

        {

          /* BRF */

          static const unsigned char iso_to_brf[64] = {

            ' ', 'A', '1', 'B', '\'', 'K', '2', 'L',

            '@', 'C', 'I', 'F', '/', 'M', 'S', 'P',

            '"', 'E', '3', 'H', '9', 'O', '6', 'R',

            '^', 'D', 'J', 'G', '>', 'N', 'T', 'Q',

            ',', '*', '5', '<', '-', 'U', '8', 'V',

            '.', '%', '[', '$', '+', 'X', '!', '&',

            ';', ':', '4', '\\', '0', 'Z', '7', '(',

            '_', '?', 'W', ']', '#', 'Y', ')', '='

          };

          if (cell >= 64)

            cell = 0;

          (void) WriteBlobByte(image,iso_to_brf[cell]);

        }

    }

    if (iso_11548_1 == 0)

      (void) WriteBlobByte(image,'\n');

  }

  status &= CloseBlob(image);

  return(status);

}