/*
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% %
% %
% %
% CCCC AAA PPPP TTTTT IIIII OOO N N %
% C A A P P T I O O NN N %
% C AAAAA PPPP T I O O N N N %
% C A A P T I O O N NN %
% CCCC A A P T IIIII OOO N N %
% %
% %
% Read Text Caption. %
% %
% Software Design %
% John Cristy %
% February 2002 %
% %
% %
% Copyright 1999-2007 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/annotate.h"
#include "magick/blob.h"
#include "magick/blob-private.h"
#include "magick/draw.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/option.h"
#include "magick/property.h"
#include "magick/quantum-private.h"
#include "magick/static.h"
#include "magick/string_.h"
#include "magick/module.h"
/*
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% %
% %
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% R e a d C A P T I O N I m a g e %
% %
% %
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%
% ReadCAPTIONImage() reads a CAPTION 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 ReadCAPTIONImage method is:
%
% Image *ReadCAPTIONImage(const ImageInfo *image_info,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image_info: The image info.
%
% o exception: return any errors or warnings in this structure.
%
*/
static Image *ReadCAPTIONImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
char
*caption,
geometry[MaxTextExtent];
const char
*gravity;
DrawInfo
*draw_info;
Image
*image;
MagickBooleanType
status;
register long
i;
TypeMetric
metrics;
unsigned long
height,
width;
/*
Initialize Image structure.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
if (image_info->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
image_info->filename);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickSignature);
image=AllocateImage(image_info);
if (image->columns == 0)
ThrowReaderException(OptionError,"MustSpecifyImageSize");
(void) ResetImagePage(image,"0x0+0+0");
/*
Format caption.
*/
(void) SetImageProperty(image,"caption",InterpretImageProperties(image_info,
image,image_info->filename));
caption=ConstantString(GetImageProperty(image,"caption"));
draw_info=CloneDrawInfo(image_info,(DrawInfo *) NULL);
draw_info->text=ConstantString(caption);
gravity=GetImageOption(image_info,"gravity");
if (gravity != (char *) NULL)
draw_info->gravity=(GravityType) ParseMagickOption(MagickGravityOptions,
MagickFalse,gravity);
if ((image->rows != 0) && (image_info->pointsize == 0.0))
{
char
*text;
/*
Scale text to fit bounding box.
*/
for ( ; ; )
{
text=AcquireString(caption);
i=FormatMagickCaption(image,draw_info,text,&metrics);
(void) CloneString(&draw_info->text,text);
text=DestroyString(text);
(void) FormatMagickString(geometry,MaxTextExtent,"%+g%+g",
-metrics.bounds.x1,metrics.ascent);
if (draw_info->gravity == UndefinedGravity)
(void) CloneString(&draw_info->geometry,AcquireString(geometry));
status=GetMultilineTypeMetrics(image,draw_info,&metrics);
width=(unsigned long) (metrics.width+draw_info->stroke_width+0.5);
height=(unsigned long) (metrics.height+draw_info->stroke_width+0.5);
if ((width > (image->columns+1)) || (height > (image->rows+1)))
break;
draw_info->pointsize*=2.0;
}
draw_info->pointsize/=2.0;
for ( ; ; )
{
text=AcquireString(caption);
i=FormatMagickCaption(image,draw_info,text,&metrics);
(void) CloneString(&draw_info->text,text);
text=DestroyString(text);
(void) FormatMagickString(geometry,MaxTextExtent,"%+g%+g",
-metrics.bounds.x1,metrics.ascent);
if (draw_info->gravity == UndefinedGravity)
(void) CloneString(&draw_info->geometry,AcquireString(geometry));
status=GetMultilineTypeMetrics(image,draw_info,&metrics);
width=(unsigned long) (metrics.width+draw_info->stroke_width+0.5);
height=(unsigned long) (metrics.height+draw_info->stroke_width+0.5);
if ((width > (image->columns+1)) || (height > (image->rows+1)))
break;
draw_info->pointsize++;
}
draw_info->pointsize--;
}
i=FormatMagickCaption(image,draw_info,caption,&metrics);
if (image->rows == 0)
image->rows=(unsigned long) ((i+1)*(metrics.ascent-metrics.descent+
draw_info->stroke_width)+0.5);
if (image->rows == 0)
image->rows=(unsigned long) ((i+1)*draw_info->pointsize+
draw_info->stroke_width+0.5);
(void) SetImageBackgroundColor(image);
/*
Draw caption.
*/
(void) CloneString(&draw_info->text,AcquireString(caption));
status=GetMultilineTypeMetrics(image,draw_info,&metrics);
(void) FormatMagickString(geometry,MaxTextExtent,"%+g%+g",
-metrics.bounds.x1+draw_info->stroke_width/2.0,metrics.ascent+
draw_info->stroke_width/2.0);
if (draw_info->gravity == UndefinedGravity)
(void) CloneString(&draw_info->geometry,AcquireString(geometry));
(void) AnnotateImage(image,draw_info);
draw_info=DestroyDrawInfo(draw_info);
caption=DestroyString(caption);
return(GetFirstImageInList(image));
}
/*
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% %
% R e g i s t e r C A P T I O N I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% RegisterCAPTIONImage() adds attributes for the CAPTION 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 RegisterCAPTIONImage method is:
%
% unsigned long RegisterCAPTIONImage(void)
%
*/
ModuleExport unsigned long RegisterCAPTIONImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("CAPTION");
entry->decoder=(DecodeImageHandler *) ReadCAPTIONImage;
entry->adjoin=MagickFalse;
entry->description=ConstantString("Image caption");
entry->module=ConstantString("CAPTION");
(void) RegisterMagickInfo(entry);
return(MagickImageCoderSignature);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r C A P T I O N I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% UnregisterCAPTIONImage() removes format registrations made by the
% CAPTION module from the list of supported formats.
%
% The format of the UnregisterCAPTIONImage method is:
%
% UnregisterCAPTIONImage(void)
%
*/
ModuleExport void UnregisterCAPTIONImage(void)
{
(void) UnregisterMagickInfo("CAPTION");
}
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