2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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 %
13 % Read An Image Filled Using Gradient. %
20 % Copyright 1999-2013 ImageMagick Studio LLC, a non-profit organization %
21 % dedicated to making software imaging solutions freely available. %
23 % You may not use this file except in compliance with the License. You may %
24 % obtain a copy of the License at %
26 % http://www.imagemagick.org/script/license.php %
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. %
34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
42 #include "MagickCore/studio.h"
43 #include "MagickCore/attribute.h"
44 #include "MagickCore/blob.h"
45 #include "MagickCore/blob-private.h"
46 #include "MagickCore/color.h"
47 #include "MagickCore/color-private.h"
48 #include "MagickCore/colorspace-private.h"
49 #include "MagickCore/draw.h"
50 #include "MagickCore/exception.h"
51 #include "MagickCore/exception-private.h"
52 #include "MagickCore/image.h"
53 #include "MagickCore/image-private.h"
54 #include "MagickCore/list.h"
55 #include "MagickCore/magick.h"
56 #include "MagickCore/memory_.h"
57 #include "MagickCore/paint.h"
58 #include "MagickCore/pixel-accessor.h"
59 #include "MagickCore/quantum-private.h"
60 #include "MagickCore/static.h"
61 #include "MagickCore/string_.h"
62 #include "MagickCore/module.h"
63 #include "MagickCore/studio.h"
66 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
70 % R e a d G R A D I E N T I m a g e %
74 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
76 % ReadGRADIENTImage creates a gradient image and initializes it to
77 % the color range as specified by the filename. It allocates the memory
78 % necessary for the new Image structure and returns a pointer to the new
81 % The format of the ReadGRADIENTImage method is:
83 % Image *ReadGRADIENTImage(const ImageInfo *image_info,
84 % ExceptionInfo *exception)
86 % A description of each parameter follows:
88 % o image_info: the image info.
90 % o exception: return any errors or warnings in this structure.
93 static Image *ReadGRADIENTImage(const ImageInfo *image_info,
94 ExceptionInfo *exception)
97 colorname[MaxTextExtent];
111 Initialize Image structure.
113 assert(image_info != (const ImageInfo *) NULL);
114 assert(image_info->signature == MagickSignature);
115 if (image_info->debug != MagickFalse)
116 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
117 image_info->filename);
118 assert(exception != (ExceptionInfo *) NULL);
119 assert(exception->signature == MagickSignature);
120 image=AcquireImage(image_info,exception);
121 if ((image->columns == 0) || (image->rows == 0))
122 ThrowReaderException(OptionError,"MustSpecifyImageSize");
123 (void) SetImageAlpha(image,(Quantum) TransparentAlpha,exception);
124 (void) CopyMagickString(image->filename,image_info->filename,MaxTextExtent);
125 (void) CopyMagickString(colorname,image_info->filename,MaxTextExtent);
126 (void) sscanf(image_info->filename,"%[^-]",colorname);
127 icc_color=MagickFalse;
128 if (LocaleCompare(colorname,"icc") == 0)
130 (void) ConcatenateMagickString(colorname,"-",MaxTextExtent);
131 (void) sscanf(image_info->filename,"%*[^-]-%[^-]",colorname+4);
132 icc_color=MagickTrue;
134 status=QueryColorCompliance(colorname,AllCompliance,&start_color,exception);
135 if (status == MagickFalse)
137 image=DestroyImage(image);
138 return((Image *) NULL);
140 (void) CopyMagickString(colorname,"white",MaxTextExtent);
141 if (GetPixelInfoIntensity(&start_color) > (Quantum) (QuantumRange/2))
142 (void) CopyMagickString(colorname,"black",MaxTextExtent);
143 if (icc_color == MagickFalse)
144 (void) sscanf(image_info->filename,"%*[^-]-%s",colorname);
146 (void) sscanf(image_info->filename,"%*[^-]-%*[^-]-%s",colorname);
147 status=QueryColorCompliance(colorname,AllCompliance,&stop_color,exception);
148 if (status == MagickFalse)
150 image=DestroyImage(image);
151 return((Image *) NULL);
153 status=GradientImage(image,LocaleCompare(image_info->magick,"GRADIENT") == 0 ?
154 LinearGradient : RadialGradient,PadSpread,&start_color,&stop_color,
156 if (status == MagickFalse)
158 image=DestroyImageList(image);
159 return((Image *) NULL);
161 if ((start_color.alpha_trait != BlendPixelTrait) && (stop_color.alpha_trait != BlendPixelTrait))
162 (void) SetImageAlphaChannel(image,DeactivateAlphaChannel,exception);
163 return(GetFirstImageInList(image));
167 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
171 % R e g i s t e r G R A D I E N T I m a g e %
175 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
177 % RegisterGRADIENTImage() adds attributes for the GRADIENT image format
178 % to the list of supported formats. The attributes include the image format
179 % tag, a method to read and/or write the format, whether the format
180 % supports the saving of more than one frame to the same file or blob,
181 % whether the format supports native in-memory I/O, and a brief
182 % description of the format.
184 % The format of the RegisterGRADIENTImage method is:
186 % size_t RegisterGRADIENTImage(void)
189 ModuleExport size_t RegisterGRADIENTImage(void)
194 entry=SetMagickInfo("GRADIENT");
195 entry->decoder=(DecodeImageHandler *) ReadGRADIENTImage;
196 entry->adjoin=MagickFalse;
197 entry->raw=MagickTrue;
198 entry->format_type=ImplicitFormatType;
199 entry->description=ConstantString("Gradual linear passing from one shade to "
201 entry->module=ConstantString("GRADIENT");
202 (void) RegisterMagickInfo(entry);
203 entry=SetMagickInfo("RADIAL-GRADIENT");
204 entry->decoder=(DecodeImageHandler *) ReadGRADIENTImage;
205 entry->adjoin=MagickFalse;
206 entry->raw=MagickTrue;
207 entry->format_type=ImplicitFormatType;
208 entry->description=ConstantString("Gradual radial passing from one shade to "
210 entry->module=ConstantString("GRADIENT");
211 (void) RegisterMagickInfo(entry);
212 return(MagickImageCoderSignature);
216 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
220 % U n r e g i s t e r G R A D I E N T I m a g e %
224 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
226 % UnregisterGRADIENTImage() removes format registrations made by the
227 % GRADIENT module from the list of supported formats.
229 % The format of the UnregisterGRADIENTImage method is:
231 % UnregisterGRADIENTImage(void)
234 ModuleExport void UnregisterGRADIENTImage(void)
236 (void) UnregisterMagickInfo("RADIAL-GRADIENT");
237 (void) UnregisterMagickInfo("GRADIENT");