1 /*
2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3 % %
4 % %
5 % %
6 % GGGG RRRR AAA DDDD IIIII EEEEE N N TTTTT %
7 % G R R A A D D I E NN N T %
8 % G GG RRRR AAAAA D D I EEE N N N T %
9 % G G R R A A D D I E N NN T %
10 % GGG R R A A DDDD IIIII EEEEE N N T %
11 % %
12 % %
13 % Read An Image Filled Using Gradient. %
14 % %
15 % Software Design %
16 % Cristy %
17 % July 1992 %
18 % %
19 % %
20 % Copyright 1999-2016 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 % http://www.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/attribute.h"
44 #include "MagickCore/blob.h"
45 #include "MagickCore/blob-private.h"
46 #include "MagickCore/channel.h"
47 #include "MagickCore/color.h"
48 #include "MagickCore/color-private.h"
49 #include "MagickCore/colorspace-private.h"
50 #include "MagickCore/constitute.h"
51 #include "MagickCore/draw.h"
52 #include "MagickCore/exception.h"
53 #include "MagickCore/exception-private.h"
54 #include "MagickCore/image.h"
55 #include "MagickCore/image-private.h"
56 #include "MagickCore/list.h"
57 #include "MagickCore/magick.h"
58 #include "MagickCore/memory_.h"
59 #include "MagickCore/paint.h"
60 #include "MagickCore/pixel-accessor.h"
61 #include "MagickCore/quantum-private.h"
62 #include "MagickCore/static.h"
63 #include "MagickCore/string_.h"
64 #include "MagickCore/module.h"
65 #include "MagickCore/studio.h"
66
67 /*
68 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
69 % %
70 % %
71 % %
72 % R e a d G R A D I E N T I m a g e %
73 % %
74 % %
75 % %
76 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
77 %
78 % ReadGRADIENTImage creates a gradient image and initializes it to
79 % the color range as specified by the filename. It allocates the memory
80 % necessary for the new Image structure and returns a pointer to the new
81 % image.
82 %
83 % The format of the ReadGRADIENTImage method is:
84 %
85 % Image *ReadGRADIENTImage(const ImageInfo *image_info,
86 % ExceptionInfo *exception)
87 %
88 % A description of each parameter follows:
89 %
90 % o image_info: the image info.
91 %
92 % o exception: return any errors or warnings in this structure.
93 %
94 */
ReadGRADIENTImage(const ImageInfo * image_info,ExceptionInfo * exception)95 static Image *ReadGRADIENTImage(const ImageInfo *image_info,
96 ExceptionInfo *exception)
97 {
98 char
99 colorname[MagickPathExtent+4];
100
101 Image
102 *image;
103
104 ImageInfo
105 *read_info;
106
107 MagickBooleanType
108 icc_color,
109 status;
110
111 StopInfo
112 *stops;
113
114 /*
115 Initialize Image structure.
116 */
117 assert(image_info != (const ImageInfo *) NULL);
118 assert(image_info->signature == MagickCoreSignature);
119 if (image_info->debug != MagickFalse)
120 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
121 image_info->filename);
122 assert(exception != (ExceptionInfo *) NULL);
123 assert(exception->signature == MagickCoreSignature);
124 read_info=CloneImageInfo(image_info);
125 SetImageInfoBlob(read_info,(void *) NULL,0);
126 (void) CopyMagickString(colorname,image_info->filename,MagickPathExtent);
127 (void) sscanf(image_info->filename,"%[^-]",colorname);
128 (void) FormatLocaleString(read_info->filename,MagickPathExtent,"xc:%s",
129 colorname);
130 image=ReadImage(read_info,exception);
131 read_info=DestroyImageInfo(read_info);
132 if (image == (Image *) NULL)
133 return((Image *) NULL);
134 (void) SetImageAlpha(image,(Quantum) TransparentAlpha,exception);
135 (void) CopyMagickString(image->filename,image_info->filename,MagickPathExtent);
136 icc_color=MagickFalse;
137 if (LocaleCompare(colorname,"icc") == 0)
138 {
139 (void) ConcatenateMagickString(colorname,"-",MagickPathExtent);
140 (void) sscanf(image_info->filename,"%*[^-]-%[^-]",colorname+4);
141 icc_color=MagickTrue;
142 }
143 stops=(StopInfo *) AcquireQuantumMemory(2,sizeof(*stops));
144 if (stops == (StopInfo *) NULL)
145 ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
146 stops[0].offset=0.0;
147 stops[1].offset=1.0;
148 status=QueryColorCompliance(colorname,AllCompliance,&stops[0].color,exception);
149 if (status == MagickFalse)
150 {
151 stops=(StopInfo *) RelinquishMagickMemory(stops);
152 image=DestroyImage(image);
153 return((Image *) NULL);
154 }
155 (void) SetImageColorspace(image,stops[0].color.colorspace,exception);
156 (void) CopyMagickString(colorname,"white",MagickPathExtent);
157 if (GetPixelInfoIntensity(image,&stops[0].color) > (QuantumRange/2.0))
158 (void) CopyMagickString(colorname,"black",MagickPathExtent);
159 if (icc_color == MagickFalse)
160 (void) sscanf(image_info->filename,"%*[^-]-%[^-]",colorname);
161 else
162 (void) sscanf(image_info->filename,"%*[^-]-%*[^-]-%[^-]",colorname);
163 status=QueryColorCompliance(colorname,AllCompliance,&stops[1].color,exception);
164 if (status == MagickFalse)
165 {
166 stops=(StopInfo *) RelinquishMagickMemory(stops);
167 image=DestroyImage(image);
168 return((Image *) NULL);
169 }
170 image->alpha_trait=stops[0].color.alpha_trait;
171 if (stops[1].color.alpha_trait != UndefinedPixelTrait)
172 image->alpha_trait=stops[1].color.alpha_trait;
173 status=GradientImage(image,LocaleCompare(image_info->magick,"GRADIENT") == 0 ?
174 LinearGradient : RadialGradient,PadSpread,stops,2,exception);
175 stops=(StopInfo *) RelinquishMagickMemory(stops);
176 if (status == MagickFalse)
177 {
178 image=DestroyImageList(image);
179 return((Image *) NULL);
180 }
181 return(GetFirstImageInList(image));
182 }
183
184 /*
185 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
186 % %
187 % %
188 % %
189 % R e g i s t e r G R A D I E N T I m a g e %
190 % %
191 % %
192 % %
193 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
194 %
195 % RegisterGRADIENTImage() adds attributes for the GRADIENT image format
196 % to the list of supported formats. The attributes include the image format
197 % tag, a method to read and/or write the format, whether the format
198 % supports the saving of more than one frame to the same file or blob,
199 % whether the format supports native in-memory I/O, and a brief
200 % description of the format.
201 %
202 % The format of the RegisterGRADIENTImage method is:
203 %
204 % size_t RegisterGRADIENTImage(void)
205 %
206 */
RegisterGRADIENTImage(void)207 ModuleExport size_t RegisterGRADIENTImage(void)
208 {
209 MagickInfo
210 *entry;
211
212 entry=AcquireMagickInfo("GRADIENT","GRADIENT",
213 "Gradual linear passing from one shade to another");
214 entry->decoder=(DecodeImageHandler *) ReadGRADIENTImage;
215 entry->flags^=CoderAdjoinFlag;
216 entry->flags|=CoderRawSupportFlag;
217 entry->format_type=ImplicitFormatType;
218 (void) RegisterMagickInfo(entry);
219 entry=AcquireMagickInfo("GRADIENT","RADIAL-GRADIENT",
220 "Gradual radial passing from one shade to another");
221 entry->decoder=(DecodeImageHandler *) ReadGRADIENTImage;
222 entry->flags^=CoderAdjoinFlag;
223 entry->flags|=CoderRawSupportFlag;
224 entry->format_type=ImplicitFormatType;
225 (void) RegisterMagickInfo(entry);
226 return(MagickImageCoderSignature);
227 }
228
229 /*
230 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
231 % %
232 % %
233 % %
234 % U n r e g i s t e r G R A D I E N T I m a g e %
235 % %
236 % %
237 % %
238 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
239 %
240 % UnregisterGRADIENTImage() removes format registrations made by the
241 % GRADIENT module from the list of supported formats.
242 %
243 % The format of the UnregisterGRADIENTImage method is:
244 %
245 % UnregisterGRADIENTImage(void)
246 %
247 */
UnregisterGRADIENTImage(void)248 ModuleExport void UnregisterGRADIENTImage(void)
249 {
250 (void) UnregisterMagickInfo("RADIAL-GRADIENT");
251 (void) UnregisterMagickInfo("GRADIENT");
252 }
253