coders/label.c - platform/external/ImageMagick - Gitiles

 /*
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %                                                                             %
 %                                                                             %
 %                                                                             %
 %                     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                                   %
 %                                                                             %
 %                                                                             %
 %  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 "MagickCore/studio.h"
 #include "MagickCore/annotate.h"
 #include "MagickCore/blob.h"
 #include "MagickCore/blob-private.h"
 #include "MagickCore/draw.h"
 #include "MagickCore/exception.h"
 #include "MagickCore/exception-private.h"
 #include "MagickCore/image.h"
 #include "MagickCore/image-private.h"
 #include "MagickCore/list.h"
 #include "MagickCore/magick.h"
 #include "MagickCore/memory_.h"
 #include "MagickCore/property.h"
 #include "MagickCore/quantum-private.h"
 #include "MagickCore/static.h"
 #include "MagickCore/string_.h"
 #include "MagickCore/module.h"
 #include "MagickCore/utility.h"

 /*
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %                                                                             %
 %                                                                             %
 %                                                                             %
 %   R e a d L A B E L I m a g e                                               %
 %                                                                             %
 %                                                                             %
 %                                                                             %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 %  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_info: the image info.
 %
 %    o exception: return any errors or warnings in this structure.
 %
 */
 static Image *ReadLABELImage(const ImageInfo *image_info,
   ExceptionInfo *exception)
 {
   char
     geometry[MaxTextExtent],
     *property;

   const char
     *label;

   DrawInfo
     *draw_info;

   Image
     *image;

   MagickBooleanType
     status;

   TypeMetric
     metrics;

   size_t
     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=AcquireImage(image_info,exception);
   (void) ResetImagePage(image,"0x0+0+0");
   property=InterpretImageProperties(image_info,image,image_info->filename,
     exception);
   (void) SetImageProperty(image,"label",property,exception);
   property=DestroyString(property);
   label=GetImageProperty(image,"label",exception);
   draw_info=CloneDrawInfo(image_info,(DrawInfo *) NULL);
   draw_info->text=ConstantString(label);
   if ((*label != '\0') && (image->rows != 0) && (image_info->pointsize == 0.0))
     {
       double
         high,
         low;

       /*
         Auto fit text into bounding box.
       */
       status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
       for ( ; ; )
       {
         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
           -metrics.bounds.x1,metrics.ascent);
         if (draw_info->gravity == UndefinedGravity)
           (void) CloneString(&draw_info->geometry,geometry);
         status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
         (void) status;
         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
         height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
         if ((width > image->columns) && (height > image->rows))
           break;
         draw_info->pointsize*=2.0;
       }
       high=draw_info->pointsize/2.0;
       low=high/2.0;
       while ((high-low) > 1.0)
       {
         draw_info->pointsize=(low+high)/2.0;
         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
           -metrics.bounds.x1,metrics.ascent);
         if (draw_info->gravity == UndefinedGravity)
           (void) CloneString(&draw_info->geometry,geometry);
         status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
         height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
         if ((width <= image->columns) && (height <= image->rows))
           low=draw_info->pointsize+1.0;
         else
           high=draw_info->pointsize-1.0;
       }
       for (draw_info->pointsize=(low+high)/2.0; ; )
       {
         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
           -metrics.bounds.x1,metrics.ascent);
         if (draw_info->gravity == UndefinedGravity)
           (void) CloneString(&draw_info->geometry,geometry);
         status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
         height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
         if ((width <= image->columns) && (height <= image->rows))
           break;
         draw_info->pointsize--;
       }
       draw_info->pointsize=floor(draw_info->pointsize);
     }
   status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
   if (status == MagickFalse)
     {
       image=DestroyImageList(image);
       return((Image *) NULL);
     }
   if (image->columns == 0)
     image->columns=(size_t) (metrics.width+draw_info->stroke_width+1.5);
   if (image->columns == 0)
     image->columns=(size_t) (draw_info->pointsize+draw_info->stroke_width+1.5);
   if (draw_info->gravity == UndefinedGravity)
     {
       (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
         -metrics.bounds.x1+draw_info->stroke_width/2.0,metrics.ascent+
         draw_info->stroke_width/2.0);
       (void) CloneString(&draw_info->geometry,geometry);
     }
   if (draw_info->direction == RightToLeftDirection)
     {
       if (draw_info->direction == RightToLeftDirection)
         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
           image->columns-(metrics.bounds.x2+draw_info->stroke_width/2.0),
           metrics.ascent+draw_info->stroke_width/2.0);
       (void) CloneString(&draw_info->geometry,geometry);
     }
   if (image->rows == 0)
     image->rows=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
   if (image->rows == 0)
     image->rows=(size_t) floor(draw_info->pointsize+draw_info->stroke_width+
       0.5);
   if (SetImageBackgroundColor(image,exception) == MagickFalse)
     {
       image=DestroyImageList(image);
       return((Image *) NULL);
     }
   (void) AnnotateImage(image,draw_info,exception);
   if (image_info->pointsize == 0.0)
     {
       char
         pointsize[MaxTextExtent];

       (void) FormatLocaleString(pointsize,MaxTextExtent,"%.20g",
         draw_info->pointsize);
       (void) SetImageProperty(image,"label:pointsize",pointsize,exception);
     }
   draw_info=DestroyDrawInfo(draw_info);
   return(GetFirstImageInList(image));
 }

 /*
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %                                                                             %
 %                                                                             %
 %                                                                             %
 %   R e g i s t e r L A B E L I m a g e                                       %
 %                                                                             %
 %                                                                             %
 %                                                                             %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 %  RegisterLABELImage() adds properties for the LABEL image format to
 %  the list of supported formats.  The properties 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:
 %
 %      size_t RegisterLABELImage(void)
 %
 */
 ModuleExport size_t RegisterLABELImage(void)
 {
   MagickInfo
     *entry;

   entry=SetMagickInfo("LABEL");
   entry->decoder=(DecodeImageHandler *) ReadLABELImage;
   entry->adjoin=MagickFalse;
   entry->format_type=ImplicitFormatType;
   entry->description=ConstantString("Image label");
   entry->module=ConstantString("LABEL");
   (void) RegisterMagickInfo(entry);
   return(MagickImageCoderSignature);
 }

 /*
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %                                                                             %
 %                                                                             %
 %                                                                             %
 %   U n r e g i s t e r L A B E L I m a g e                                   %
 %                                                                             %
 %                                                                             %
 %                                                                             %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 %  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");
 }
	/*
	%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	% %
	% %
	% %
	% 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 %
	% %
	% %
	% 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 "MagickCore/studio.h"
	#include "MagickCore/annotate.h"
	#include "MagickCore/blob.h"
	#include "MagickCore/blob-private.h"
	#include "MagickCore/draw.h"
	#include "MagickCore/exception.h"
	#include "MagickCore/exception-private.h"
	#include "MagickCore/image.h"
	#include "MagickCore/image-private.h"
	#include "MagickCore/list.h"
	#include "MagickCore/magick.h"
	#include "MagickCore/memory_.h"
	#include "MagickCore/property.h"
	#include "MagickCore/quantum-private.h"
	#include "MagickCore/static.h"
	#include "MagickCore/string_.h"
	#include "MagickCore/module.h"
	#include "MagickCore/utility.h"

	/*
	%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	% %
	% %
	% %
	% R e a d L A B E L I m a g e %
	% %
	% %
	% %
	%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	%
	% 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_info: the image info.
	%
	% o exception: return any errors or warnings in this structure.
	%
	*/
	static Image ReadLABELImage(const ImageInfo image_info,
	ExceptionInfo *exception)
	{
	char
	geometry[MaxTextExtent],
	*property;

	const char
	*label;

	DrawInfo
	*draw_info;

	Image
	*image;

	MagickBooleanType
	status;

	TypeMetric
	metrics;

	size_t
	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=AcquireImage(image_info,exception);
	(void) ResetImagePage(image,"0x0+0+0");
	property=InterpretImageProperties(image_info,image,image_info->filename,
	exception);
	(void) SetImageProperty(image,"label",property,exception);
	property=DestroyString(property);
	label=GetImageProperty(image,"label",exception);
	draw_info=CloneDrawInfo(image_info,(DrawInfo *) NULL);
	draw_info->text=ConstantString(label);
	if ((*label != '\0') && (image->rows != 0) && (image_info->pointsize == 0.0))
	{
	double
	high,
	low;

	/*
	Auto fit text into bounding box.
	*/
	status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
	for ( ; ; )
	{
	(void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
	-metrics.bounds.x1,metrics.ascent);
	if (draw_info->gravity == UndefinedGravity)
	(void) CloneString(&draw_info->geometry,geometry);
	status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
	(void) status;
	width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
	height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
	if ((width > image->columns) && (height > image->rows))
	break;
	draw_info->pointsize*=2.0;
	}
	high=draw_info->pointsize/2.0;
	low=high/2.0;
	while ((high-low) > 1.0)
	{
	draw_info->pointsize=(low+high)/2.0;
	(void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
	-metrics.bounds.x1,metrics.ascent);
	if (draw_info->gravity == UndefinedGravity)
	(void) CloneString(&draw_info->geometry,geometry);
	status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
	width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
	height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
	if ((width <= image->columns) && (height <= image->rows))
	low=draw_info->pointsize+1.0;
	else
	high=draw_info->pointsize-1.0;
	}
	for (draw_info->pointsize=(low+high)/2.0; ; )
	{
	(void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
	-metrics.bounds.x1,metrics.ascent);
	if (draw_info->gravity == UndefinedGravity)
	(void) CloneString(&draw_info->geometry,geometry);
	status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
	width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
	height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
	if ((width <= image->columns) && (height <= image->rows))
	break;
	draw_info->pointsize--;
	}
	draw_info->pointsize=floor(draw_info->pointsize);
	}
	status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
	if (status == MagickFalse)
	{
	image=DestroyImageList(image);
	return((Image *) NULL);
	}
	if (image->columns == 0)
	image->columns=(size_t) (metrics.width+draw_info->stroke_width+1.5);
	if (image->columns == 0)
	image->columns=(size_t) (draw_info->pointsize+draw_info->stroke_width+1.5);
	if (draw_info->gravity == UndefinedGravity)
	{
	(void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
	-metrics.bounds.x1+draw_info->stroke_width/2.0,metrics.ascent+
	draw_info->stroke_width/2.0);
	(void) CloneString(&draw_info->geometry,geometry);
	}
	if (draw_info->direction == RightToLeftDirection)
	{
	if (draw_info->direction == RightToLeftDirection)
	(void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
	image->columns-(metrics.bounds.x2+draw_info->stroke_width/2.0),
	metrics.ascent+draw_info->stroke_width/2.0);
	(void) CloneString(&draw_info->geometry,geometry);
	}
	if (image->rows == 0)
	image->rows=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
	if (image->rows == 0)
	image->rows=(size_t) floor(draw_info->pointsize+draw_info->stroke_width+
	0.5);
	if (SetImageBackgroundColor(image,exception) == MagickFalse)
	{
	image=DestroyImageList(image);
	return((Image *) NULL);
	}
	(void) AnnotateImage(image,draw_info,exception);
	if (image_info->pointsize == 0.0)
	{
	char
	pointsize[MaxTextExtent];

	(void) FormatLocaleString(pointsize,MaxTextExtent,"%.20g",
	draw_info->pointsize);
	(void) SetImageProperty(image,"label:pointsize",pointsize,exception);
	}
	draw_info=DestroyDrawInfo(draw_info);
	return(GetFirstImageInList(image));
	}

	/*
	%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	% %
	% %
	% %
	% R e g i s t e r L A B E L I m a g e %
	% %
	% %
	% %
	%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	%
	% RegisterLABELImage() adds properties for the LABEL image format to
	% the list of supported formats. The properties 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:
	%
	% size_t RegisterLABELImage(void)
	%
	*/
	ModuleExport size_t RegisterLABELImage(void)
	{
	MagickInfo
	*entry;

	entry=SetMagickInfo("LABEL");
	entry->decoder=(DecodeImageHandler *) ReadLABELImage;
	entry->adjoin=MagickFalse;
	entry->format_type=ImplicitFormatType;
	entry->description=ConstantString("Image label");
	entry->module=ConstantString("LABEL");
	(void) RegisterMagickInfo(entry);
	return(MagickImageCoderSignature);
	}

	/*
	%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	% %
	% %
	% %
	% U n r e g i s t e r L A B E L I m a g e %
	% %
	% %
	% %
	%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	%
	% 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");
	}