coders/caption.c

/*
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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                %
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%                                                                             %
%                             Read Text Caption.                              %
%                                                                             %
%                              Software Design                                %
%                                John Cristy                                  %
%                               February 2002                                 %
%                                                                             %
%                                                                             %
%  Copyright 1999-2012 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/composite-private.h"
#include "MagickCore/draw.h"
#include "MagickCore/draw-private.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/module.h"
#include "MagickCore/option.h"
#include "MagickCore/property.h"
#include "MagickCore/quantum-private.h"
#include "MagickCore/static.h"
#include "MagickCore/string_.h"
#include "MagickCore/string-private.h"
#include "MagickCore/utility.h"

/*
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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],
    *property;

  const char
    *gravity,
    *option;

  DrawInfo
    *draw_info;

  Image
    *image;

  MagickBooleanType
    status;

  register ssize_t
    i;

  size_t
    height,
    width;

  TypeMetric
    metrics;

  /*
    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);
  if (image->columns == 0)
    ThrowReaderException(OptionError,"MustSpecifyImageSize");
  (void) ResetImagePage(image,"0x0+0+0");
  /*
    Format caption.
  */
  option=GetImageOption(image_info,"filename");
  if (option == (const char *) NULL)
    property=InterpretImageProperties(image_info,image,image_info->filename,
      exception);
  else
    if (LocaleNCompare(option,"caption:",8) == 0)
      property=InterpretImageProperties(image_info,image,option+8,exception);
    else
      property=InterpretImageProperties(image_info,image,option,exception);
  (void) SetImageProperty(image,"caption",property,exception);
  property=DestroyString(property);
  caption=ConstantString(GetImageProperty(image,"caption",exception));
  draw_info=CloneDrawInfo(image_info,(DrawInfo *) NULL);
  (void) CloneString(&draw_info->text,caption);
  gravity=GetImageOption(image_info,"gravity");
  if (gravity != (char *) NULL)
    draw_info->gravity=(GravityType) ParseCommandOption(MagickGravityOptions,
      MagickFalse,gravity);
  if ((*caption != '\0') && (image->rows != 0) &&
      (image_info->pointsize == 0.0))
    {
      char
        *text;

      double
        high,
        low;

      /*
        Auto fit text into bounding box.
      */
      for ( ; ; )
      {
        text=AcquireString(caption);
        i=FormatMagickCaption(image,draw_info,MagickFalse,&metrics,&text,
          exception);
        (void) CloneString(&draw_info->text,text);
        text=DestroyString(text);
        (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;
        text=AcquireString(caption);
        i=FormatMagickCaption(image,draw_info,MagickFalse,&metrics,&text,
          exception);
        (void) CloneString(&draw_info->text,text);
        text=DestroyString(text);
        (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; ; )
      {
        text=AcquireString(caption);
        i=FormatMagickCaption(image,draw_info,MagickFalse,&metrics,&text,
          exception);
        (void) CloneString(&draw_info->text,text);
        text=DestroyString(text);
        (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);
    }
  i=FormatMagickCaption(image,draw_info,MagickTrue,&metrics,&caption,exception);
  if (image->rows == 0)
    image->rows=(size_t) ((i+1)*(metrics.ascent-metrics.descent+
      draw_info->interline_spacing+draw_info->stroke_width)+0.5);
  if (image->rows == 0)
    image->rows=(size_t) ((i+1)*draw_info->pointsize+
      draw_info->interline_spacing+draw_info->stroke_width+0.5);
  if (SetImageBackgroundColor(image,exception) == MagickFalse)
    {
      image=DestroyImageList(image);
      return((Image *) NULL);
    }
  /*
    Draw caption.
  */
  (void) CloneString(&draw_info->text,caption);
  status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
  if ((draw_info->gravity != UndefinedGravity) &&
      (draw_info->direction != RightToLeftDirection))
    image->page.x=(ssize_t) (metrics.bounds.x1-draw_info->stroke_width/2.0);
  else
    {
      (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
        -metrics.bounds.x1+draw_info->stroke_width/2.0,metrics.ascent+
        draw_info->stroke_width/2.0);
      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);
      draw_info->geometry=AcquireString(geometry);
    }
  status=AnnotateImage(image,draw_info,exception);
  draw_info=DestroyDrawInfo(draw_info);
  caption=DestroyString(caption);
  if (status == MagickFalse)
    {
      image=DestroyImageList(image);
      return((Image *) NULL);
    }
  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                                   %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  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:
%
%      size_t RegisterCAPTIONImage(void)
%
*/
ModuleExport size_t RegisterCAPTIONImage(void)
{
  MagickInfo
    *entry;

  entry=SetMagickInfo("CAPTION");
  entry->decoder=(DecodeImageHandler *) ReadCAPTIONImage;
  entry->description=ConstantString("Caption");
  entry->adjoin=MagickFalse;
  entry->module=ConstantString("CAPTION");
  (void) RegisterMagickInfo(entry);
  return(MagickImageCoderSignature);
}

/*
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%   U n r e g i s t e r C A P T I O N I m a g e                               %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  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");
}