/*
% Copyright (C) 2019 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"
/*
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 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% 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;
unsigned int
status;
register const IndexPacket
*indexes;
register const PixelPacket
*p;
register unsigned long
x;
unsigned long
cell_height = 4;
unsigned long
y;
/*
Open output image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image != (Image *) NULL);
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) FormatString(buffer,"X: %.20g\n",(double)
image->page.x);
(void) WriteBlobString(image,buffer);
}
if (image->page.y != 0)
{
(void) FormatString(buffer,"Y: %.20g\n",(double)
image->page.y);
(void) WriteBlobString(image,buffer);
}
(void) FormatString(buffer,"Width: %.20g\n",(double)
image->columns+(image->columns % 2));
(void) WriteBlobString(image,buffer);
(void) FormatString(buffer,"Height: %.20g\n",(double)
image->rows);
(void) WriteBlobString(image,buffer);
(void) WriteBlobString(image,"\n");
}
(void) SetImageType(image,BilevelType);
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', ')', '='
};
(void) WriteBlobByte(image,iso_to_brf[cell]);
}
}
if (iso_11548_1 == 0)
(void) WriteBlobByte(image,'\n');
}
status &= CloseBlob(image);
return(status);
}
