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/*
% Copyright (C) 2003-2015 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.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% L AAA BBBB EEEEE L %
% L A A B B E L %
% L AAAAA BBBB EEE L %
% L A A B B E L %
% LLLLL A A BBBB EEEEE LLLLL %
% %
% %
% Read ASCII String As An Image %
% %
% %
% Software Design %
% John Cristy %
% July 1992 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/magick.h"
#include "magick/render.h"
#include "magick/utility.h"
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e a d L A B E L I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method ReadLABELImage reads a LABEL 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 ReadLABELImage method is:
%
% Image *ReadLABELImage(const ImageInfo *image_info,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: Method ReadLABELImage 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.
%
%
*/
#define ThrowLABELReaderException(code_,reason_,image_) \
do { \
if (draw_info) \
DestroyDrawInfo(draw_info); \
ThrowReaderException(code_,reason_,image_); \
} while (0);
static Image *ReadLABELImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
char
geometry[MaxTextExtent];
DrawInfo
*draw_info = (DrawInfo *) NULL;
Image
*image;
TypeMetric
metrics;
unsigned int
status;
unsigned long
height,
width;
/*
Initialize Image structure.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickSignature);
image=AllocateImage(image_info);
draw_info=CloneDrawInfo(image_info,(DrawInfo *) NULL);
if (draw_info == (DrawInfo *) NULL)
ThrowLABELReaderException(ResourceLimitError,MemoryAllocationFailed,image);
draw_info->fill=image_info->pen;
draw_info->text=TranslateText(image_info,image,image_info->filename);
if (draw_info->text == (char *) NULL)
ThrowLABELReaderException(CoderError,UnableToTranslateText,image);
if ((image->columns != 0) || (image->rows != 0))
{
/*
Fit label to canvas size.
*/
for ( ; GetTypeMetrics(image,draw_info,&metrics); draw_info->pointsize*=2)
{
width=(unsigned long) floor(metrics.width+metrics.max_advance/2+0.5);
height=(unsigned long) floor(metrics.ascent-metrics.descent+0.5);
if (((image->columns != 0) && (width >= image->columns)) ||
((image->rows != 0) && (height >= image->rows)))
break;
}
for ( ; GetTypeMetrics(image,draw_info,&metrics); draw_info->pointsize--)
{
width=(unsigned long) floor(metrics.width+metrics.max_advance/2+0.5);
height=(unsigned long) floor(metrics.ascent-metrics.descent+0.5);
if ((image->columns != 0) && (width <= image->columns) &&
((image->rows == 0) || (height <= image->rows)))
break;
if ((image->rows != 0) && (height <= image->rows) &&
((image->columns == 0) || (width <= image->columns)))
break;
if (draw_info->pointsize < 2.0)
break;
}
}
status=GetTypeMetrics(image,draw_info,&metrics);
if (status == False)
ThrowLABELReaderException(TypeError,UnableToGetTypeMetrics,image);
FormatString(geometry,"+%g+%g",metrics.max_advance/4,metrics.ascent);
if (image->columns == 0)
image->columns=(unsigned long)
floor(metrics.width+metrics.max_advance/2+0.5);
if (image->rows == 0)
{
image->rows=(unsigned long) floor(metrics.ascent-metrics.descent+0.5);
FormatString(geometry,"+%g+%g",image->columns/2.0-metrics.width/2.0,
metrics.ascent);
}
draw_info->geometry=AllocateString(geometry);
(void) SetImage(image,OpaqueOpacity);
(void) AnnotateImage(image,draw_info);
DestroyDrawInfo(draw_info);
StopTimer(&image->timer);
return(image);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e g i s t e r L A B E L I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method RegisterLABELImage adds attributes for the LABEL 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 RegisterLABELImage method is:
%
% RegisterLABELImage(void)
%
*/
ModuleExport void RegisterLABELImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("LABEL");
entry->decoder=(DecoderHandler) ReadLABELImage;
entry->adjoin=False;
entry->description="Image label";
entry->module="LABEL";
entry->coder_class=PrimaryCoderClass;
entry->extension_treatment=IgnoreExtensionTreatment;
(void) RegisterMagickInfo(entry);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r L A B E L I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method UnregisterLABELImage removes format registrations made by the
% LABEL module from the list of supported formats.
%
% The format of the UnregisterLABELImage method is:
%
% UnregisterLABELImage(void)
%
*/
ModuleExport void UnregisterLABELImage(void)
{
(void) UnregisterMagickInfo("LABEL");
}
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