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 1999-2012 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/blob.h"
44 #include "MagickCore/blob-private.h"
45 #include "MagickCore/color.h"
46 #include "MagickCore/color-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/paint.h"
56 #include "MagickCore/pixel-accessor.h"
57 #include "MagickCore/quantum-private.h"
58 #include "MagickCore/static.h"
59 #include "MagickCore/string_.h"
60 #include "MagickCore/module.h"
61 #include "MagickCore/studio.h"
64 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
68 % R e a d G R A D I E N T I m a g e %
72 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
74 % ReadGRADIENTImage creates a gradient image and initializes it to
75 % the color range as specified by the filename. It allocates the memory
76 % necessary for the new Image structure and returns a pointer to the new
79 % The format of the ReadGRADIENTImage method is:
81 % Image *ReadGRADIENTImage(const ImageInfo *image_info,
82 % ExceptionInfo *exception)
84 % A description of each parameter follows:
86 % o image_info: the image info.
88 % o exception: return any errors or warnings in this structure.
91 static Image *ReadGRADIENTImage(const ImageInfo *image_info,
92 ExceptionInfo *exception)
95 colorname[MaxTextExtent];
108 Initialize Image structure.
110 assert(image_info != (const ImageInfo *) NULL);
111 assert(image_info->signature == MagickSignature);
112 if (image_info->debug != MagickFalse)
113 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
114 image_info->filename);
115 assert(exception != (ExceptionInfo *) NULL);
116 assert(exception->signature == MagickSignature);
117 image=AcquireImage(image_info,exception);
118 if ((image->columns == 0) || (image->rows == 0))
119 ThrowReaderException(OptionError,"MustSpecifyImageSize");
120 (void) SetImageAlpha(image,(Quantum) TransparentAlpha,exception);
121 (void) CopyMagickString(image->filename,image_info->filename,MaxTextExtent);
122 (void) CopyMagickString(colorname,image_info->filename,MaxTextExtent);
123 (void) sscanf(image_info->filename,"%[^-]",colorname);
124 status=QueryColorCompliance(colorname,AllCompliance,&start_color,exception);
125 if (status == MagickFalse)
127 image=DestroyImage(image);
128 return((Image *) NULL);
130 (void) CopyMagickString(colorname,"white",MaxTextExtent);
131 if (GetPixelInfoIntensity(&start_color) > (Quantum) (QuantumRange/2))
132 (void) CopyMagickString(colorname,"black",MaxTextExtent);
133 (void) sscanf(image_info->filename,"%*[^-]-%s",colorname);
134 status=QueryColorCompliance(colorname,AllCompliance,&stop_color,exception);
135 if (status == MagickFalse)
137 image=DestroyImage(image);
138 return((Image *) NULL);
140 (void) GradientImage(image,LocaleCompare(image_info->magick,"GRADIENT") == 0 ?
141 LinearGradient : RadialGradient,PadSpread,&start_color,&stop_color,
143 return(GetFirstImageInList(image));
147 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
151 % R e g i s t e r G R A D I E N T I m a g e %
155 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
157 % RegisterGRADIENTImage() adds attributes for the GRADIENT image format
158 % to the list of supported formats. The attributes include the image format
159 % tag, a method to read and/or write the format, whether the format
160 % supports the saving of more than one frame to the same file or blob,
161 % whether the format supports native in-memory I/O, and a brief
162 % description of the format.
164 % The format of the RegisterGRADIENTImage method is:
166 % size_t RegisterGRADIENTImage(void)
169 ModuleExport size_t RegisterGRADIENTImage(void)
174 entry=SetMagickInfo("GRADIENT");
175 entry->decoder=(DecodeImageHandler *) ReadGRADIENTImage;
176 entry->adjoin=MagickFalse;
177 entry->raw=MagickTrue;
178 entry->format_type=ImplicitFormatType;
179 entry->description=ConstantString("Gradual linear passing from one shade to "
181 entry->module=ConstantString("GRADIENT");
182 (void) RegisterMagickInfo(entry);
183 entry=SetMagickInfo("RADIAL-GRADIENT");
184 entry->decoder=(DecodeImageHandler *) ReadGRADIENTImage;
185 entry->adjoin=MagickFalse;
186 entry->raw=MagickTrue;
187 entry->format_type=ImplicitFormatType;
188 entry->description=ConstantString("Gradual radial passing from one shade to "
190 entry->module=ConstantString("GRADIENT");
191 (void) RegisterMagickInfo(entry);
192 return(MagickImageCoderSignature);
196 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
200 % U n r e g i s t e r G R A D I E N T I m a g e %
204 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
206 % UnregisterGRADIENTImage() removes format registrations made by the
207 % GRADIENT module from the list of supported formats.
209 % The format of the UnregisterGRADIENTImage method is:
211 % UnregisterGRADIENTImage(void)
214 ModuleExport void UnregisterGRADIENTImage(void)
216 (void) UnregisterMagickInfo("RADIAL-GRADIENT");
217 (void) UnregisterMagickInfo("GRADIENT");