328 lines
13 KiB
C
328 lines
13 KiB
C
/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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% CCCC AAA PPPP TTTTT IIIII OOO N N %
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% C A A P P T I O O NN N %
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% C AAAAA PPPP T I O O N N N %
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% C A A P T I O O N NN %
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% CCCC A A P T IIIII OOO N N %
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% %
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% %
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% Read Text Caption. %
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% %
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% Software Design %
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% John Cristy %
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% February 2002 %
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% %
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% %
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% Copyright 1999-2013 ImageMagick Studio LLC, a non-profit organization %
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% dedicated to making software imaging solutions freely available. %
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% %
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% You may not use this file except in compliance with the License. You may %
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% obtain a copy of the License at %
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% %
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% http://www.imagemagick.org/script/license.php %
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% %
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% Unless required by applicable law or agreed to in writing, software %
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% distributed under the License is distributed on an "AS IS" BASIS, %
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% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
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% See the License for the specific language governing permissions and %
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% limitations under the License. %
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% %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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%
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*/
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/*
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Include declarations.
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*/
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#include "magick/studio.h"
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#include "magick/annotate.h"
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#include "magick/blob.h"
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#include "magick/blob-private.h"
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#include "magick/composite-private.h"
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#include "magick/draw.h"
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#include "magick/draw-private.h"
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#include "magick/exception.h"
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#include "magick/exception-private.h"
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#include "magick/image.h"
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#include "magick/image-private.h"
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#include "magick/list.h"
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#include "magick/magick.h"
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#include "magick/memory_.h"
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#include "magick/module.h"
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#include "magick/option.h"
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#include "magick/pixel-accessor.h"
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#include "magick/property.h"
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#include "magick/quantum-private.h"
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#include "magick/static.h"
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#include "magick/string_.h"
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#include "magick/string-private.h"
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#include "magick/utility.h"
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/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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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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% %
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% %
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% %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% ReadCAPTIONImage() reads a CAPTION image file and returns it. It
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% allocates the memory necessary for the new Image structure and returns a
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% pointer to the new image.
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%
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% The format of the ReadCAPTIONImage method is:
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%
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% Image *ReadCAPTIONImage(const ImageInfo *image_info,
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% ExceptionInfo *exception)
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%
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% A description of each parameter follows:
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%
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% o image_info: the image info.
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%
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% o exception: return any errors or warnings in this structure.
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%
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*/
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static Image *ReadCAPTIONImage(const ImageInfo *image_info,
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ExceptionInfo *exception)
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{
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char
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*caption,
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geometry[MaxTextExtent],
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*property;
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const char
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*gravity,
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*option;
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DrawInfo
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*draw_info;
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Image
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*image;
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MagickBooleanType
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status;
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register ssize_t
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i;
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size_t
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height,
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width;
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TypeMetric
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metrics;
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/*
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Initialize Image structure.
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*/
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assert(image_info != (const ImageInfo *) NULL);
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assert(image_info->signature == MagickSignature);
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if (image_info->debug != MagickFalse)
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(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
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image_info->filename);
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assert(exception != (ExceptionInfo *) NULL);
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assert(exception->signature == MagickSignature);
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image=AcquireImage(image_info);
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if (image->columns == 0)
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ThrowReaderException(OptionError,"MustSpecifyImageSize");
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(void) ResetImagePage(image,"0x0+0+0");
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/*
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Format caption.
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*/
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option=GetImageOption(image_info,"filename");
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if (option == (const char *) NULL)
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property=InterpretImageProperties(image_info,image,image_info->filename);
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else
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if (LocaleNCompare(option,"caption:",8) == 0)
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property=InterpretImageProperties(image_info,image,option+8);
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else
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property=InterpretImageProperties(image_info,image,option);
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(void) SetImageProperty(image,"caption",property);
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property=DestroyString(property);
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caption=ConstantString(GetImageProperty(image,"caption"));
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draw_info=CloneDrawInfo(image_info,(DrawInfo *) NULL);
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(void) CloneString(&draw_info->text,caption);
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gravity=GetImageOption(image_info,"gravity");
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if (gravity != (char *) NULL)
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draw_info->gravity=(GravityType) ParseCommandOption(MagickGravityOptions,
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MagickFalse,gravity);
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if ((*caption != '\0') && (image->rows != 0) &&
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(image_info->pointsize == 0.0))
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{
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char
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*text;
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double
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high,
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low;
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/*
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Auto fit text into bounding box.
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*/
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for ( ; ; draw_info->pointsize*=2.0)
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{
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text=AcquireString(caption);
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i=FormatMagickCaption(image,draw_info,MagickTrue,&metrics,&text);
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(void) CloneString(&draw_info->text,text);
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text=DestroyString(text);
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(void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
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-metrics.bounds.x1,metrics.ascent);
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if (draw_info->gravity == UndefinedGravity)
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(void) CloneString(&draw_info->geometry,geometry);
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status=GetMultilineTypeMetrics(image,draw_info,&metrics);
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(void) status;
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width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
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height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
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if ((width > image->columns) && (height > image->rows))
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break;
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}
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high=draw_info->pointsize/2.0;
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for (low=high/2.0; (high-low) > 1.0; )
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{
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draw_info->pointsize=(low+high)/2.0;
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text=AcquireString(caption);
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i=FormatMagickCaption(image,draw_info,MagickTrue,&metrics,&text);
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(void) CloneString(&draw_info->text,text);
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text=DestroyString(text);
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(void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
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-metrics.bounds.x1,metrics.ascent);
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if (draw_info->gravity == UndefinedGravity)
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(void) CloneString(&draw_info->geometry,geometry);
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status=GetMultilineTypeMetrics(image,draw_info,&metrics);
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width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
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height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
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if ((width <= image->columns) && (height <= image->rows))
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low=draw_info->pointsize+1.0;
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else
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high=draw_info->pointsize-1.0;
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}
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for (draw_info->pointsize=(low+high)/2.0; ; draw_info->pointsize--)
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{
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text=AcquireString(caption);
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i=FormatMagickCaption(image,draw_info,MagickTrue,&metrics,&text);
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(void) CloneString(&draw_info->text,text);
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text=DestroyString(text);
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(void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
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-metrics.bounds.x1,metrics.ascent);
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if (draw_info->gravity == UndefinedGravity)
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(void) CloneString(&draw_info->geometry,geometry);
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status=GetMultilineTypeMetrics(image,draw_info,&metrics);
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width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
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height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
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if ((width <= image->columns) && (height <= image->rows))
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break;
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}
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draw_info->pointsize=floor(draw_info->pointsize);
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}
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i=FormatMagickCaption(image,draw_info,MagickTrue,&metrics,&caption);
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if (image->rows == 0)
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image->rows=(size_t) ((i+1)*(metrics.ascent-metrics.descent+
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draw_info->interline_spacing+draw_info->stroke_width)+0.5);
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if (image->rows == 0)
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image->rows=(size_t) ((i+1)*draw_info->pointsize+
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draw_info->interline_spacing+draw_info->stroke_width+0.5);
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if (SetImageBackgroundColor(image) == MagickFalse)
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{
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InheritException(exception,&image->exception);
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image=DestroyImageList(image);
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return((Image *) NULL);
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}
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/*
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Draw caption.
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*/
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(void) CloneString(&draw_info->text,caption);
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status=GetMultilineTypeMetrics(image,draw_info,&metrics);
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if ((draw_info->gravity != UndefinedGravity) &&
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(draw_info->direction != RightToLeftDirection))
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image->page.x=(ssize_t) (metrics.bounds.x1-draw_info->stroke_width/2.0);
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else
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{
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(void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
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-metrics.bounds.x1+draw_info->stroke_width/2.0,metrics.ascent+
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draw_info->stroke_width/2.0);
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if (draw_info->direction == RightToLeftDirection)
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(void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
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image->columns-(metrics.bounds.x2+draw_info->stroke_width/2.0),
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metrics.ascent+draw_info->stroke_width/2.0);
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draw_info->geometry=AcquireString(geometry);
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}
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status=AnnotateImage(image,draw_info);
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draw_info=DestroyDrawInfo(draw_info);
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caption=DestroyString(caption);
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if (status == MagickFalse)
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{
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image=DestroyImageList(image);
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return((Image *) NULL);
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}
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return(GetFirstImageInList(image));
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}
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/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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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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% %
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% %
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% %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% RegisterCAPTIONImage() adds attributes for the CAPTION image format to
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% the list of supported formats. The attributes include the image format
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% tag, a method to read and/or write the format, whether the format
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% supports the saving of more than one frame to the same file or blob,
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% whether the format supports native in-memory I/O, and a brief
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% description of the format.
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%
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% The format of the RegisterCAPTIONImage method is:
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%
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% size_t RegisterCAPTIONImage(void)
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%
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*/
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ModuleExport size_t RegisterCAPTIONImage(void)
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{
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MagickInfo
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*entry;
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entry=SetMagickInfo("CAPTION");
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entry->decoder=(DecodeImageHandler *) ReadCAPTIONImage;
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entry->description=ConstantString("Caption");
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entry->adjoin=MagickFalse;
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entry->module=ConstantString("CAPTION");
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(void) RegisterMagickInfo(entry);
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return(MagickImageCoderSignature);
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}
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/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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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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% %
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% %
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% %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% UnregisterCAPTIONImage() removes format registrations made by the
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% CAPTION module from the list of supported formats.
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%
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% The format of the UnregisterCAPTIONImage method is:
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%
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% UnregisterCAPTIONImage(void)
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%
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*/
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ModuleExport void UnregisterCAPTIONImage(void)
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{
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(void) UnregisterMagickInfo("CAPTION");
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}
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