/* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % 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 % % Cristy % % July 1992 % % % % % % Copyright 1999-2021 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 % % % % https://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/artifact.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/pixel-accessor.h" #include "magick/property.h" #include "magick/quantum-private.h" #include "magick/resource_.h" #include "magick/static.h" #include "magick/string_.h" #include "magick/module.h" #include "magick/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[MagickPathExtent], *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 == MagickCoreSignature); if (image_info->debug != MagickFalse) (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s", image_info->filename); assert(exception != (ExceptionInfo *) NULL); assert(exception->signature == MagickCoreSignature); image=AcquireImage(image_info); (void) ResetImagePage(image,"0x0+0+0"); if ((image->columns != 0) && (image->rows != 0)) { status=SetImageExtent(image,image->columns,image->rows); if (status == MagickFalse) return(DestroyImageList(image)); (void) SetImageBackgroundColor(image); } label=InterpretImageProperties(image_info,image,image_info->filename); if (label == (char *) NULL) return(DestroyImageList(image)); (void) SetImageProperty(image,"label",label); draw_info=CloneDrawInfo(image_info,(DrawInfo *) NULL); width=(size_t) floor(draw_info->pointsize*strlen(label)+0.5); if (AcquireMagickResource(WidthResource,width) == MagickFalse) { label=DestroyString(label); draw_info=DestroyDrawInfo(draw_info); ThrowReaderException(ImageError,"WidthOrHeightExceedsLimit"); } draw_info->text=ConstantString(label); (void) memset(&metrics,0,sizeof(metrics)); status=GetMultilineTypeMetrics(image,draw_info,&metrics); if ((image->columns == 0) && (image->rows == 0)) { image->columns=(size_t) floor(metrics.width+draw_info->stroke_width+0.5); image->rows=(size_t) floor(metrics.height+draw_info->stroke_width+0.5); } else if ((status != MagickFalse) && (strlen(label) > 0) && (((image->columns == 0) || (image->rows == 0)) || (fabs(image_info->pointsize) < MagickEpsilon))) { double high, low; ssize_t n; /* Auto fit text into bounding box. */ for (n=0; n < 32; n++, draw_info->pointsize*=2.0) { (void) FormatLocaleString(geometry,MagickPathExtent,"%+g%+g", -metrics.bounds.x1,metrics.ascent); if (draw_info->gravity == UndefinedGravity) (void) CloneString(&draw_info->geometry,geometry); status=GetMultilineTypeMetrics(image,draw_info,&metrics); if (status == MagickFalse) break; 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 ((image->columns != 0) && (image->rows != 0)) { if ((width >= image->columns) && (height >= image->rows)) break; } else if (((image->columns != 0) && (width >= image->columns)) || ((image->rows != 0) && (height >= image->rows))) break; } if (status == MagickFalse) { label=DestroyString(label); draw_info=DestroyDrawInfo(draw_info); image=DestroyImageList(image); return((Image *) NULL); } high=draw_info->pointsize; for (low=1.0; (high-low) > 0.5; ) { draw_info->pointsize=(low+high)/2.0; (void) FormatLocaleString(geometry,MagickPathExtent,"%+g%+g", -metrics.bounds.x1,metrics.ascent); if (draw_info->gravity == UndefinedGravity) (void) CloneString(&draw_info->geometry,geometry); status=GetMultilineTypeMetrics(image,draw_info,&metrics); if (status == MagickFalse) break; 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 ((image->columns != 0) && (image->rows != 0)) { if ((width < image->columns) && (height < image->rows)) low=draw_info->pointsize+0.5; else high=draw_info->pointsize-0.5; } else if (((image->columns != 0) && (width < image->columns)) || ((image->rows != 0) && (height < image->rows))) low=draw_info->pointsize+0.5; else high=draw_info->pointsize-0.5; } if (status != MagickFalse) { draw_info->pointsize=floor((low+high)/2.0-0.5); status=GetMultilineTypeMetrics(image,draw_info,&metrics); } } label=DestroyString(label); if (status == MagickFalse) { draw_info=DestroyDrawInfo(draw_info); InheritException(exception,&image->exception); image=DestroyImageList(image); return((Image *) NULL); } if (image->columns == 0) image->columns=(size_t) floor(metrics.width+draw_info->stroke_width+0.5); if (image->columns == 0) image->columns=(size_t) floor(draw_info->pointsize+draw_info->stroke_width+ 0.5); if (image->rows == 0) image->rows=(size_t) floor(metrics.ascent-metrics.descent+ draw_info->stroke_width+0.5); if (image->rows == 0) image->rows=(size_t) floor(draw_info->pointsize+draw_info->stroke_width+ 0.5); status=SetImageExtent(image,image->columns,image->rows); if (status == MagickFalse) { draw_info=DestroyDrawInfo(draw_info); InheritException(exception,&image->exception); return(DestroyImageList(image)); } if (SetImageBackgroundColor(image) == MagickFalse) { draw_info=DestroyDrawInfo(draw_info); InheritException(exception,&image->exception); image=DestroyImageList(image); return((Image *) NULL); } /* Draw label. */ (void) FormatLocaleString(geometry,MagickPathExtent,"%+g%+g", (draw_info->direction == RightToLeftDirection ? (double) image->columns- metrics.bounds.x2 : 0.0),(draw_info->gravity == UndefinedGravity ? MagickMax(metrics.ascent,metrics.bounds.y2) : 0.0)); (void) CloneString(&draw_info->geometry,geometry); status=AnnotateImage(image,draw_info); if (image_info->pointsize == 0.0) { char pointsize[MagickPathExtent]; (void) FormatLocaleString(pointsize,MagickPathExtent,"%.20g", draw_info->pointsize); (void) SetImageProperty(image,"label:pointsize",pointsize); } draw_info=DestroyDrawInfo(draw_info); if (status == MagickFalse) { image=DestroyImageList(image); return((Image *) NULL); } 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->magick_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"); }