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 1999-2011 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];
105 Initialize Image structure.
107 assert(image_info != (const ImageInfo *) NULL);
108 assert(image_info->signature == MagickSignature);
109 if (image_info->debug != MagickFalse)
110 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
111 image_info->filename);
112 assert(exception != (ExceptionInfo *) NULL);
113 assert(exception->signature == MagickSignature);
114 image=AcquireImage(image_info);
115 if ((image->columns == 0) || (image->rows == 0))
116 ThrowReaderException(OptionError,"MustSpecifyImageSize");
117 (void) SetImageOpacity(image,(Quantum) TransparentAlpha);
118 (void) CopyMagickString(image->filename,image_info->filename,MaxTextExtent);
119 (void) CopyMagickString(colorname,image_info->filename,MaxTextExtent);
120 (void) sscanf(image_info->filename,"%[^-]",colorname);
121 if (QueryColorDatabase(colorname,&start_color,exception) == MagickFalse)
123 image=DestroyImage(image);
124 return((Image *) NULL);
126 (void) CopyMagickString(colorname,"white",MaxTextExtent);
127 if (GetPixelPacketIntensity(&start_color) > (Quantum) (QuantumRange/2))
128 (void) CopyMagickString(colorname,"black",MaxTextExtent);
129 (void) sscanf(image_info->filename,"%*[^-]-%s",colorname);
130 if (QueryColorDatabase(colorname,&stop_color,exception) == MagickFalse)
132 image=DestroyImage(image);
133 return((Image *) NULL);
135 (void) GradientImage(image,LocaleCompare(image_info->magick,"GRADIENT") == 0 ?
136 LinearGradient : RadialGradient,PadSpread,&start_color,&stop_color);
137 return(GetFirstImageInList(image));
141 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
145 % R e g i s t e r G R A D I E N T I m a g e %
149 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
151 % RegisterGRADIENTImage() adds attributes for the GRADIENT image format
152 % to the list of supported formats. The attributes include the image format
153 % tag, a method to read and/or write the format, whether the format
154 % supports the saving of more than one frame to the same file or blob,
155 % whether the format supports native in-memory I/O, and a brief
156 % description of the format.
158 % The format of the RegisterGRADIENTImage method is:
160 % size_t RegisterGRADIENTImage(void)
163 ModuleExport size_t RegisterGRADIENTImage(void)
168 entry=SetMagickInfo("GRADIENT");
169 entry->decoder=(DecodeImageHandler *) ReadGRADIENTImage;
170 entry->adjoin=MagickFalse;
171 entry->raw=MagickTrue;
172 entry->format_type=ImplicitFormatType;
173 entry->description=ConstantString("Gradual linear passing from one shade to "
175 entry->module=ConstantString("GRADIENT");
176 (void) RegisterMagickInfo(entry);
177 entry=SetMagickInfo("RADIAL-GRADIENT");
178 entry->decoder=(DecodeImageHandler *) ReadGRADIENTImage;
179 entry->adjoin=MagickFalse;
180 entry->raw=MagickTrue;
181 entry->format_type=ImplicitFormatType;
182 entry->description=ConstantString("Gradual radial passing from one shade to "
184 entry->module=ConstantString("GRADIENT");
185 (void) RegisterMagickInfo(entry);
186 return(MagickImageCoderSignature);
190 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
194 % U n r e g i s t e r G R A D I E N T I m a g e %
198 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
200 % UnregisterGRADIENTImage() removes format registrations made by the
201 % GRADIENT module from the list of supported formats.
203 % The format of the UnregisterGRADIENTImage method is:
205 % UnregisterGRADIENTImage(void)
208 ModuleExport void UnregisterGRADIENTImage(void)
210 (void) UnregisterMagickInfo("RADIAL-GRADIENT");
211 (void) UnregisterMagickInfo("GRADIENT");