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DEFINITIONS
This source file includes following definitions.
- RegisterBRAILLEImage
- UnregisterBRAILLEImage
- WriteBRAILLEImage
/*
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% %
% %
% 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 %
% %
% %
% Copyright 1999-2013 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/attribute.h"
#include "magick/blob.h"
#include "magick/blob-private.h"
#include "magick/cache.h"
#include "magick/color-private.h"
#include "magick/colorspace.h"
#include "magick/constitute.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/module.h"
#include "magick/monitor.h"
#include "magick/monitor-private.h"
#include "magick/pixel-accessor.h"
#include "magick/property.h"
#include "magick/quantize.h"
#include "magick/static.h"
#include "magick/string_.h"
#include "magick/utility.h"
/*
Forward declarations.
*/
static MagickBooleanType
WriteBRAILLEImage(const ImageInfo *,Image *);
/*
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% %
% %
% %
% 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 size_t RegisterBRAILLEImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("BRF");
entry->encoder=(EncodeImageHandler *) WriteBRAILLEImage;
entry->adjoin=MagickFalse;
entry->description=AcquireString("BRF ASCII Braille format");
entry->module=AcquireString("BRAILLE");
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("UBRL");
entry->encoder=(EncodeImageHandler *) WriteBRAILLEImage;
entry->adjoin=MagickFalse;
entry->description=AcquireString("Unicode Text format");
entry->module=AcquireString("BRAILLE");
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("ISOBRL");
entry->encoder=(EncodeImageHandler *) WriteBRAILLEImage;
entry->adjoin=MagickFalse;
entry->description=AcquireString("ISO/TR 11548-1 format");
entry->module=AcquireString("BRAILLE");
(void) RegisterMagickInfo(entry);
return(MagickImageCoderSignature);
}
/*
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% U n r e g i s t e r B R A I L L E I m a g e %
% %
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% %
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%
% 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("ISOBRL");
}
/*
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% %
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% 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:
%
% MagickBooleanType WriteBRAILLEImage(const ImageInfo *image_info,
% Image *image)
%
% A description of each parameter follows.
%
% o image_info: The image info.
%
% o image: The image.
%
*/
static MagickBooleanType WriteBRAILLEImage(const ImageInfo *image_info,
Image *image)
{
char
buffer[MaxTextExtent];
const char
*value;
IndexPacket
polarity;
int
unicode = 0,
iso_11548_1 = 0;
MagickBooleanType
status;
register const IndexPacket
*indexes;
register const PixelPacket
*p;
register ssize_t
x;
size_t
cell_height = 4;
ssize_t
y;
/*
Open output image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
if (LocaleCompare(image_info->magick, "UBRL") == 0)
unicode=1;
else
if (LocaleCompare(image_info->magick, "ISOBRL") == 0)
iso_11548_1=1;
else
cell_height=3;
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 (!iso_11548_1)
{
value=GetImageProperty(image,"label");
if (value != (const char *) NULL)
{
(void) FormatLocaleString(buffer,MaxTextExtent,"Title: %s\n", value);
(void) WriteBlobString(image,buffer);
}
if (image->page.x != 0)
{
(void) FormatLocaleString(buffer,MaxTextExtent,"X: %.20g\n",(double)
image->page.x);
(void) WriteBlobString(image,buffer);
}
if (image->page.y != 0)
{
(void) FormatLocaleString(buffer,MaxTextExtent,"Y: %.20g\n",(double)
image->page.y);
(void) WriteBlobString(image,buffer);
}
(void) FormatLocaleString(buffer,MaxTextExtent,"Width: %.20g\n",(double)
(image->columns+(image->columns % 2)));
(void) WriteBlobString(image,buffer);
(void) FormatLocaleString(buffer,MaxTextExtent,"Height: %.20g\n",(double)
image->rows);
(void) WriteBlobString(image,buffer);
(void) WriteBlobString(image,"\n");
}
(void) SetImageType(image,BilevelType);
polarity=0;
if (image->storage_class == PseudoClass) {
polarity=(IndexPacket) (GetPixelLuma(image,&image->colormap[0]) >=
(QuantumRange/2));
if (image->colors == 2)
polarity=(IndexPacket) (GetPixelLuma(image,&image->colormap[0]) >=
GetPixelLuma(image,&image->colormap[1]));
}
for (y=0; y < (ssize_t) image->rows; y+=(ssize_t) cell_height)
{
if ((y+cell_height) > image->rows)
cell_height = (size_t) (image->rows-y);
p=GetVirtualPixels(image,0,y,image->columns,cell_height,&image->exception);
if (p == (const PixelPacket *) NULL)
break;
indexes=GetVirtualIndexQueue(image);
for (x=0; x < (ssize_t) image->columns; x+=2)
{
unsigned char cell = 0;
int two_columns = x+1 < (ssize_t) image->columns;
do
{
#define do_cell(dx,dy,bit) do { \
if (image->storage_class == PseudoClass) \
cell |= (GetPixelIndex(indexes+x+dx+dy*image->columns) == polarity) << bit; \
else \
cell |= (GetPixelGreen(p+x+dx+dy*image->columns) == 0) << 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=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
image->rows);
if (status == MagickFalse)
break;
}
(void) CloseBlob(image);
return(MagickTrue);
}