mirror of
https://github.com/ImageMagick/ImageMagick.git
synced 2026-05-25 11:24:54 +02:00
Dirk Lemstra
397 lines
15 KiB
C
397 lines
15 KiB
C
/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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% L AAA BBBB EEEEE L %
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% L A A B B E L %
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% L AAAAA BBBB EEE L %
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% L A A B B E L %
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% LLLLL A A BBBB EEEEE LLLLL %
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% %
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% %
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% Read ASCII String As An Image. %
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% %
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% Software Design %
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% Cristy %
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% July 1992 %
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% %
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% %
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% Copyright @ 1999 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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% https://imagemagick.org/license/ %
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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 "MagickCore/studio.h"
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#include "MagickCore/annotate.h"
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#include "MagickCore/artifact.h"
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#include "MagickCore/blob.h"
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#include "MagickCore/blob-private.h"
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#include "MagickCore/draw.h"
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#include "MagickCore/exception.h"
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#include "MagickCore/exception-private.h"
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#include "MagickCore/image.h"
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#include "MagickCore/image-private.h"
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#include "MagickCore/list.h"
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#include "MagickCore/magick.h"
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#include "MagickCore/memory_.h"
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#include "MagickCore/option.h"
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#include "MagickCore/property.h"
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#include "MagickCore/quantum-private.h"
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#include "MagickCore/resource_.h"
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#include "MagickCore/static.h"
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#include "MagickCore/string_.h"
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#include "MagickCore/string-private.h"
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#include "MagickCore/module.h"
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#include "MagickCore/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 L A B E L 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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% ReadLABELImage() reads a LABEL 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 ReadLABELImage method is:
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%
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% Image *ReadLABELImage(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 inline void AdjustTypeMetricBounds(TypeMetric *metrics)
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{
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if (metrics->bounds.x1 >= 0.0)
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metrics->bounds.x1=0.0;
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else
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{
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double x1 = ceil(-metrics->bounds.x1+0.5);
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metrics->width+=x1+x1;
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metrics->bounds.x1=x1;
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}
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}
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static Image *ReadLABELImage(const ImageInfo *image_info,
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ExceptionInfo *exception)
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{
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char
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geometry[MagickPathExtent],
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*label;
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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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left_bearing,
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status;
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TypeMetric
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metrics;
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size_t
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height,
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width;
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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 == MagickCoreSignature);
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assert(exception != (ExceptionInfo *) NULL);
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assert(exception->signature == MagickCoreSignature);
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if (IsEventLogging() != MagickFalse)
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(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
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image_info->filename);
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image=AcquireImage(image_info,exception);
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(void) ResetImagePage(image,"0x0+0+0");
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if ((image->columns != 0) && (image->rows != 0))
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{
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status=SetImageExtent(image,image->columns,image->rows,exception);
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if (status == MagickFalse)
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return(DestroyImageList(image));
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(void) SetImageBackgroundColor(image,exception);
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}
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label=InterpretImageProperties((ImageInfo *) image_info,image,
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image_info->filename,exception);
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if (label == (char *) NULL)
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return(DestroyImageList(image));
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(void) SetImageProperty(image,"label",label,exception);
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draw_info=CloneDrawInfo(image_info,(DrawInfo *) NULL);
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width=CastDoubleToSizeT(0.5*draw_info->pointsize*strlen(label)+0.5);
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if (AcquireMagickResource(WidthResource,width) == MagickFalse)
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{
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label=DestroyString(label);
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draw_info=DestroyDrawInfo(draw_info);
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ThrowReaderException(ImageError,"WidthOrHeightExceedsLimit");
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}
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draw_info->text=ConstantString(label);
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(void) memset(&metrics,0,sizeof(metrics));
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status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
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AdjustTypeMetricBounds(&metrics);
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if ((image->columns == 0) && (image->rows == 0))
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{
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image->columns=CastDoubleToSizeT(floor(metrics.width+
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draw_info->stroke_width+0.5));
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image->rows=CastDoubleToSizeT(floor(metrics.height+
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draw_info->stroke_width+0.5));
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}
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else
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if ((status != MagickFalse) && (strlen(label) > 0) &&
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(((image->columns == 0) || (image->rows == 0)) ||
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(fabs(image_info->pointsize) < MagickEpsilon)))
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{
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const char
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*option;
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double
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high,
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low;
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ssize_t
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n;
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/*
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Auto fit text into bounding box.
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*/
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low=1.0;
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option=GetImageOption(image_info,"label:max-pointsize");
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if (option != (const char*) NULL)
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{
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high=StringToDouble(option,(char**) NULL);
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if (high < 1.0)
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high=1.0;
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high+=1.0;
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}
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else
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{
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option=GetImageOption(image_info,"label:start-pointsize");
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if (option != (const char *) NULL)
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{
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draw_info->pointsize=StringToDouble(option,(char**) NULL);
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if (draw_info->pointsize < 1.0)
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draw_info->pointsize=1.0;
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}
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for (n=0; n < 32; n++, draw_info->pointsize*=2.0)
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{
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(void) FormatLocaleString(geometry,MagickPathExtent,"%+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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exception);
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if (status == MagickFalse)
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break;
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AdjustTypeMetricBounds(&metrics);
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width=CastDoubleToSizeT(metrics.width+draw_info->stroke_width+
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0.5);
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height=CastDoubleToSizeT(metrics.height-
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metrics.underline_position+draw_info->stroke_width+0.5);
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if ((image->columns != 0) && (image->rows != 0))
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{
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if ((width > image->columns) && (height > image->rows))
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break;
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if ((width <= image->columns) && (height <= image->rows))
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low=draw_info->pointsize;
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}
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else
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if (((image->columns != 0) && (width > image->columns)) ||
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((image->rows != 0) && (height > image->rows)))
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break;
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}
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if (status == MagickFalse)
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{
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label=DestroyString(label);
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draw_info=DestroyDrawInfo(draw_info);
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image=DestroyImageList(image);
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return((Image *) NULL);
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}
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high=draw_info->pointsize;
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}
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while ((high-low) > 0.5)
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{
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draw_info->pointsize=(low+high)/2.0;
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(void) FormatLocaleString(geometry,MagickPathExtent,"%+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,exception);
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if (status == MagickFalse)
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break;
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AdjustTypeMetricBounds(&metrics);
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width=CastDoubleToSizeT(metrics.width+draw_info->stroke_width+0.5);
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height=CastDoubleToSizeT(metrics.height-metrics.underline_position+
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draw_info->stroke_width+0.5);
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if ((image->columns != 0) && (image->rows != 0))
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{
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if ((width < image->columns) && (height < image->rows))
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low=draw_info->pointsize+0.5;
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else
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high=draw_info->pointsize-0.5;
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}
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else
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if (((image->columns != 0) && (width < image->columns)) ||
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((image->rows != 0) && (height < image->rows)))
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low=draw_info->pointsize+0.5;
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else
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high=draw_info->pointsize-0.5;
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}
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if (status != MagickFalse)
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draw_info->pointsize=floor(low-0.5);
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}
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label=DestroyString(label);
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if (status == MagickFalse)
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{
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draw_info=DestroyDrawInfo(draw_info);
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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 label.
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*/
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status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
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AdjustTypeMetricBounds(&metrics);
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if (image->columns == 0)
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image->columns=CastDoubleToSizeT(floor(metrics.width+
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draw_info->stroke_width+0.5));
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if (image->columns == 0)
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image->columns=CastDoubleToSizeT(floor(draw_info->pointsize+
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draw_info->stroke_width+0.5));
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if (image->rows == 0)
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image->rows=CastDoubleToSizeT(floor(metrics.height+
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draw_info->stroke_width+0.5));
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if (image->rows == 0)
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image->rows=CastDoubleToSizeT(floor(draw_info->pointsize+
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draw_info->stroke_width+0.5));
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status=SetImageExtent(image,image->columns,image->rows,exception);
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if (status == MagickFalse)
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{
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draw_info=DestroyDrawInfo(draw_info);
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return(DestroyImageList(image));
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}
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if (SetImageBackgroundColor(image,exception) == MagickFalse)
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{
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draw_info=DestroyDrawInfo(draw_info);
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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 label.
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*/
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left_bearing=((draw_info->gravity == UndefinedGravity) ||
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(draw_info->gravity == NorthWestGravity) ||
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(draw_info->gravity == WestGravity) ||
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(draw_info->gravity == SouthWestGravity)) ? MagickTrue : MagickFalse;
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(void) FormatLocaleString(geometry,MagickPathExtent,"%+g%+g",
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(draw_info->direction == RightToLeftDirection ? (double) image->columns-
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(draw_info->gravity == UndefinedGravity ? metrics.bounds.x2 : 0.0) :
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(left_bearing != MagickFalse ? metrics.bounds.x1 : 0.0)),
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(draw_info->gravity == UndefinedGravity ?
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MagickMax(metrics.ascent,metrics.bounds.y2) : 0.0));
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(void) CloneString(&draw_info->geometry,geometry);
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status=AnnotateImage(image,draw_info,exception);
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if (image_info->pointsize == 0.0)
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(void) FormatImageProperty(image,"label:pointsize","%.20g",
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draw_info->pointsize);
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draw_info=DestroyDrawInfo(draw_info);
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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 L A B E L 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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% RegisterLABELImage() adds properties for the LABEL image format to
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% the list of supported formats. The properties 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 RegisterLABELImage method is:
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%
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% size_t RegisterLABELImage(void)
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%
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*/
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ModuleExport size_t RegisterLABELImage(void)
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{
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MagickInfo
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*entry;
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entry=AcquireMagickInfo("LABEL","LABEL","Image label");
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entry->decoder=(DecodeImageHandler *) ReadLABELImage;
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entry->flags^=CoderAdjoinFlag;
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entry->format_type=ImplicitFormatType;
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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 L A B E L 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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% UnregisterLABELImage() removes format registrations made by the
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% LABEL module from the list of supported formats.
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%
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% The format of the UnregisterLABELImage method is:
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%
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% UnregisterLABELImage(void)
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%
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*/
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ModuleExport void UnregisterLABELImage(void)
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{
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(void) UnregisterMagickInfo("LABEL");
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}
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