1 /*
2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3 % %
4 % %
5 % %
6 % L AAA BBBB EEEEE L %
7 % L A A B B E L %
8 % L AAAAA BBBB EEE L %
9 % L A A B B E L %
10 % LLLLL A A BBBB EEEEE LLLLL %
11 % %
12 % %
13 % Read ASCII String As An Image. %
14 % %
15 % Software Design %
16 % Cristy %
17 % July 1992 %
18 % %
19 % %
20 % Copyright 1999-2021 ImageMagick Studio LLC, a non-profit organization %
21 % dedicated to making software imaging solutions freely available. %
22 % %
23 % You may not use this file except in compliance with the License. You may %
24 % obtain a copy of the License at %
25 % %
26 % https://imagemagick.org/script/license.php %
27 % %
28 % Unless required by applicable law or agreed to in writing, software %
29 % distributed under the License is distributed on an "AS IS" BASIS, %
30 % WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
31 % See the License for the specific language governing permissions and %
32 % limitations under the License. %
33 % %
34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
35 %
36 %
37 */
38
39 /*
40 Include declarations.
41 */
42 #include "MagickCore/studio.h"
43 #include "MagickCore/annotate.h"
44 #include "MagickCore/artifact.h"
45 #include "MagickCore/blob.h"
46 #include "MagickCore/blob-private.h"
47 #include "MagickCore/draw.h"
48 #include "MagickCore/exception.h"
49 #include "MagickCore/exception-private.h"
50 #include "MagickCore/image.h"
51 #include "MagickCore/image-private.h"
52 #include "MagickCore/list.h"
53 #include "MagickCore/magick.h"
54 #include "MagickCore/memory_.h"
55 #include "MagickCore/property.h"
56 #include "MagickCore/quantum-private.h"
57 #include "MagickCore/resource_.h"
58 #include "MagickCore/static.h"
59 #include "MagickCore/string_.h"
60 #include "MagickCore/module.h"
61 #include "MagickCore/utility.h"
62
63 /*
64 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
65 % %
66 % %
67 % %
68 % R e a d L A B E L I m a g e %
69 % %
70 % %
71 % %
72 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
73 %
74 % ReadLABELImage() reads a LABEL image file and returns it. It
75 % allocates the memory necessary for the new Image structure and returns a
76 % pointer to the new image.
77 %
78 % The format of the ReadLABELImage method is:
79 %
80 % Image *ReadLABELImage(const ImageInfo *image_info,
81 % ExceptionInfo *exception)
82 %
83 % A description of each parameter follows:
84 %
85 % o image_info: the image info.
86 %
87 % o exception: return any errors or warnings in this structure.
88 %
89 */
ReadLABELImage(const ImageInfo * image_info,ExceptionInfo * exception)90 static Image *ReadLABELImage(const ImageInfo *image_info,
91 ExceptionInfo *exception)
92 {
93 char
94 geometry[MagickPathExtent],
95 *label;
96
97 DrawInfo
98 *draw_info;
99
100 Image
101 *image;
102
103 MagickBooleanType
104 status;
105
106 TypeMetric
107 metrics;
108
109 size_t
110 height,
111 width;
112
113 /*
114 Initialize Image structure.
115 */
116 assert(image_info != (const ImageInfo *) NULL);
117 assert(image_info->signature == MagickCoreSignature);
118 if (image_info->debug != MagickFalse)
119 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
120 image_info->filename);
121 assert(exception != (ExceptionInfo *) NULL);
122 assert(exception->signature == MagickCoreSignature);
123 image=AcquireImage(image_info,exception);
124 (void) ResetImagePage(image,"0x0+0+0");
125 if ((image->columns != 0) && (image->rows != 0))
126 {
127 status=SetImageExtent(image,image->columns,image->rows,exception);
128 if (status == MagickFalse)
129 return(DestroyImageList(image));
130 (void) SetImageBackgroundColor(image,exception);
131 }
132 label=InterpretImageProperties((ImageInfo *) image_info,image,
133 image_info->filename,exception);
134 if (label == (char *) NULL)
135 return(DestroyImageList(image));
136 (void) SetImageProperty(image,"label",label,exception);
137 draw_info=CloneDrawInfo(image_info,(DrawInfo *) NULL);
138 width=(size_t) floor(draw_info->pointsize*strlen(label)+0.5);
139 if (AcquireMagickResource(WidthResource,width) == MagickFalse)
140 {
141 label=DestroyString(label);
142 draw_info=DestroyDrawInfo(draw_info);
143 ThrowReaderException(ImageError,"WidthOrHeightExceedsLimit");
144 }
145 draw_info->text=ConstantString(label);
146 (void) memset(&metrics,0,sizeof(metrics));
147 status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
148 if ((image->columns == 0) && (image->rows == 0))
149 {
150 image->columns=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
151 image->rows=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
152 }
153 else
154 if ((status != MagickFalse) && (strlen(label) > 0) &&
155 (((image->columns == 0) || (image->rows == 0)) ||
156 (fabs(image_info->pointsize) < MagickEpsilon)))
157 {
158 double
159 high,
160 low;
161
162 ssize_t
163 n;
164
165 /*
166 Auto fit text into bounding box.
167 */
168 for (n=0; n < 32; n++, draw_info->pointsize*=2.0)
169 {
170 (void) FormatLocaleString(geometry,MagickPathExtent,"%+g%+g",
171 -metrics.bounds.x1,metrics.ascent);
172 if (draw_info->gravity == UndefinedGravity)
173 (void) CloneString(&draw_info->geometry,geometry);
174 status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
175 if (status == MagickFalse)
176 break;
177 width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
178 height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
179 if ((image->columns != 0) && (image->rows != 0))
180 {
181 if ((width >= image->columns) && (height >= image->rows))
182 break;
183 }
184 else
185 if (((image->columns != 0) && (width >= image->columns)) ||
186 ((image->rows != 0) && (height >= image->rows)))
187 break;
188 }
189 if (status == MagickFalse)
190 {
191 label=DestroyString(label);
192 draw_info=DestroyDrawInfo(draw_info);
193 image=DestroyImageList(image);
194 return((Image *) NULL);
195 }
196 high=draw_info->pointsize;
197 for (low=1.0; (high-low) > 0.5; )
198 {
199 draw_info->pointsize=(low+high)/2.0;
200 (void) FormatLocaleString(geometry,MagickPathExtent,"%+g%+g",
201 -metrics.bounds.x1,metrics.ascent);
202 if (draw_info->gravity == UndefinedGravity)
203 (void) CloneString(&draw_info->geometry,geometry);
204 status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
205 if (status == MagickFalse)
206 break;
207 width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
208 height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
209 if ((image->columns != 0) && (image->rows != 0))
210 {
211 if ((width < image->columns) && (height < image->rows))
212 low=draw_info->pointsize+0.5;
213 else
214 high=draw_info->pointsize-0.5;
215 }
216 else
217 if (((image->columns != 0) && (width < image->columns)) ||
218 ((image->rows != 0) && (height < image->rows)))
219 low=draw_info->pointsize+0.5;
220 else
221 high=draw_info->pointsize-0.5;
222 }
223 if (status != MagickFalse)
224 {
225 draw_info->pointsize=floor((low+high)/2.0-0.5);
226 status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
227 }
228 }
229 label=DestroyString(label);
230 if (status == MagickFalse)
231 {
232 draw_info=DestroyDrawInfo(draw_info);
233 image=DestroyImageList(image);
234 return((Image *) NULL);
235 }
236 if (image->columns == 0)
237 image->columns=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
238 if (image->columns == 0)
239 image->columns=(size_t) floor(draw_info->pointsize+draw_info->stroke_width+
240 0.5);
241 if (image->rows == 0)
242 image->rows=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
243 if (image->rows == 0)
244 image->rows=(size_t) floor(draw_info->pointsize+draw_info->stroke_width+
245 0.5);
246 status=SetImageExtent(image,image->columns,image->rows,exception);
247 if (status == MagickFalse)
248 {
249 draw_info=DestroyDrawInfo(draw_info);
250 return(DestroyImageList(image));
251 }
252 if (SetImageBackgroundColor(image,exception) == MagickFalse)
253 {
254 draw_info=DestroyDrawInfo(draw_info);
255 image=DestroyImageList(image);
256 return((Image *) NULL);
257 }
258 /*
259 Draw label.
260 */
261 (void) FormatLocaleString(geometry,MagickPathExtent,"%+g%+g",
262 (draw_info->direction == RightToLeftDirection ? (double) image->columns-
263 metrics.bounds.x2 : 0.0),(draw_info->gravity == UndefinedGravity ?
264 MagickMax(metrics.ascent,metrics.bounds.y2) : 0.0));
265 (void) CloneString(&draw_info->geometry,geometry);
266 status=AnnotateImage(image,draw_info,exception);
267 if (image_info->pointsize == 0.0)
268 (void) FormatImageProperty(image,"label:pointsize","%.20g",
269 draw_info->pointsize);
270 draw_info=DestroyDrawInfo(draw_info);
271 if (status == MagickFalse)
272 {
273 image=DestroyImageList(image);
274 return((Image *) NULL);
275 }
276 return(GetFirstImageInList(image));
277 }
278
279 /*
280 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
281 % %
282 % %
283 % %
284 % R e g i s t e r L A B E L I m a g e %
285 % %
286 % %
287 % %
288 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
289 %
290 % RegisterLABELImage() adds properties for the LABEL image format to
291 % the list of supported formats. The properties include the image format
292 % tag, a method to read and/or write the format, whether the format
293 % supports the saving of more than one frame to the same file or blob,
294 % whether the format supports native in-memory I/O, and a brief
295 % description of the format.
296 %
297 % The format of the RegisterLABELImage method is:
298 %
299 % size_t RegisterLABELImage(void)
300 %
301 */
RegisterLABELImage(void)302 ModuleExport size_t RegisterLABELImage(void)
303 {
304 MagickInfo
305 *entry;
306
307 entry=AcquireMagickInfo("LABEL","LABEL","Image label");
308 entry->decoder=(DecodeImageHandler *) ReadLABELImage;
309 entry->flags^=CoderAdjoinFlag;
310 entry->format_type=ImplicitFormatType;
311 (void) RegisterMagickInfo(entry);
312 return(MagickImageCoderSignature);
313 }
314
315 /*
316 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
317 % %
318 % %
319 % %
320 % U n r e g i s t e r L A B E L I m a g e %
321 % %
322 % %
323 % %
324 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
325 %
326 % UnregisterLABELImage() removes format registrations made by the
327 % LABEL module from the list of supported formats.
328 %
329 % The format of the UnregisterLABELImage method is:
330 %
331 % UnregisterLABELImage(void)
332 %
333 */
UnregisterLABELImage(void)334 ModuleExport void UnregisterLABELImage(void)
335 {
336 (void) UnregisterMagickInfo("LABEL");
337 }
338