/* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % GGGG RRRR AAA DDDD IIIII EEEEE N N TTTTT % % G R R A A D D I E NN N T % % G GG RRRR AAAAA D D I EEE N N N T % % G G R R A A D D I E N NN T % % GGG R R A A DDDD IIIII EEEEE N N T % % % % % % Read An Image Filled Using Gradient. % % % % Software Design % % Cristy % % July 1992 % % % % % % Copyright 1999-2020 ImageMagick Studio LLC, a non-profit organization % % dedicated to making software imaging solutions freely available. % % % % You may not use this file except in compliance with the License. You may % % obtain a copy of the License at % % % % https://imagemagick.org/script/license.php % % % % Unless required by applicable law or agreed to in writing, software % % distributed under the License is distributed on an "AS IS" BASIS, % % WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. % % See the License for the specific language governing permissions and % % limitations under the License. % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % */ /* Include declarations. */ #include "MagickCore/studio.h" #include "MagickCore/attribute.h" #include "MagickCore/blob.h" #include "MagickCore/blob-private.h" #include "MagickCore/channel.h" #include "MagickCore/color.h" #include "MagickCore/color-private.h" #include "MagickCore/colorspace-private.h" #include "MagickCore/constitute.h" #include "MagickCore/draw.h" #include "MagickCore/exception.h" #include "MagickCore/exception-private.h" #include "MagickCore/image.h" #include "MagickCore/image-private.h" #include "MagickCore/list.h" #include "MagickCore/magick.h" #include "MagickCore/memory_.h" #include "MagickCore/paint.h" #include "MagickCore/pixel-accessor.h" #include "MagickCore/quantum-private.h" #include "MagickCore/static.h" #include "MagickCore/string_.h" #include "MagickCore/module.h" #include "MagickCore/studio.h" /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % R e a d G R A D I E N T I m a g e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % ReadGRADIENTImage creates a gradient image and initializes it to % the color range as specified by the filename. It allocates the memory % necessary for the new Image structure and returns a pointer to the new % image. % % The format of the ReadGRADIENTImage method is: % % Image *ReadGRADIENTImage(const ImageInfo *image_info, % ExceptionInfo *exception) % % A description of each parameter follows: % % o image_info: the image info. % % o exception: return any errors or warnings in this structure. % */ static Image *ReadXCImage(const ImageInfo *image_info,ExceptionInfo *exception) { Image *image; MagickBooleanType status; PixelInfo pixel; register ssize_t x; register Quantum *q; ssize_t y; /* Initialize Image structure. */ assert(image_info != (const ImageInfo *) NULL); assert(image_info->signature == MagickCoreSignature); if (image_info->debug != MagickFalse) (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s", image_info->filename); assert(exception != (ExceptionInfo *) NULL); assert(exception->signature == MagickCoreSignature); image=AcquireImage(image_info,exception); if (image->columns == 0) image->columns=1; if (image->rows == 0) image->rows=1; status=SetImageExtent(image,image->columns,image->rows,exception); if (status == MagickFalse) return(DestroyImageList(image)); (void) CopyMagickString(image->filename,image_info->filename, MagickPathExtent); if (*image_info->filename == '\0') pixel=image->background_color; else { status=QueryColorCompliance((char *) image_info->filename,AllCompliance, &pixel,exception); if (status == MagickFalse) { image=DestroyImage(image); return((Image *) NULL); } } (void) SetImageColorspace(image,pixel.colorspace,exception); image->alpha_trait=pixel.alpha_trait; for (y=0; y < (ssize_t) image->rows; y++) { q=QueueAuthenticPixels(image,0,y,image->columns,1,exception); if (q == (Quantum *) NULL) break; for (x=0; x < (ssize_t) image->columns; x++) { SetPixelViaPixelInfo(image,&pixel,q); q+=GetPixelChannels(image); } if (SyncAuthenticPixels(image,exception) == MagickFalse) break; } return(GetFirstImageInList(image)); } static Image *ReadGRADIENTImage(const ImageInfo *image_info, ExceptionInfo *exception) { char start_color[MagickPathExtent], stop_color[MagickPathExtent]; Image *image; ImageInfo *read_info; MagickBooleanType status; StopInfo *stops; /* Identify start and stop gradient colors. */ assert(image_info != (const ImageInfo *) NULL); assert(image_info->signature == MagickCoreSignature); if (image_info->debug != MagickFalse) (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s", image_info->filename); assert(exception != (ExceptionInfo *) NULL); assert(exception->signature == MagickCoreSignature); (void) CopyMagickString(start_color,"white",MagickPathExtent); (void) CopyMagickString(stop_color,"black",MagickPathExtent); if (*image_info->filename != '\0') { register char *p; (void) CopyMagickString(start_color,image_info->filename, MagickPathExtent); for (p=start_color; (*p != '-') && (*p != '\0'); p++) if (*p == '(') { for (p++; (*p != ')') && (*p != '\0'); p++); if (*p == '\0') break; } if (*p == '-') (void) CopyMagickString(stop_color,p+1,MagickPathExtent); *p='\0'; } /* Create base gradient image from start color. */ read_info=CloneImageInfo(image_info); SetImageInfoBlob(read_info,(void *) NULL,0); (void) CopyMagickString(read_info->filename,start_color,MagickPathExtent); image=ReadXCImage(read_info,exception); read_info=DestroyImageInfo(read_info); if (image == (Image *) NULL) return((Image *) NULL); /* Create gradient stops. */ stops=(StopInfo *) AcquireQuantumMemory(2,sizeof(*stops)); if (stops == (StopInfo *) NULL) ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed"); stops[0].offset=0.0; stops[1].offset=1.0; status=QueryColorCompliance(start_color,AllCompliance,&stops[0].color, exception); if (status != MagickFalse) status=QueryColorCompliance(stop_color,AllCompliance,&stops[1].color, exception); if (status == MagickFalse) { stops=(StopInfo *) RelinquishMagickMemory(stops); image=DestroyImage(image); return((Image *) NULL); } (void) SetImageColorspace(image,stops[0].color.colorspace,exception); if ((stops[0].color.alpha_trait != UndefinedPixelTrait) || (stops[1].color.alpha_trait != UndefinedPixelTrait)) SetImageAlpha(image,TransparentAlpha,exception); /* Paint gradient. */ status=GradientImage(image,LocaleCompare(image_info->magick,"GRADIENT") == 0 ? LinearGradient : RadialGradient,PadSpread,stops,2,exception); stops=(StopInfo *) RelinquishMagickMemory(stops); if (status == MagickFalse) { image=DestroyImageList(image); return((Image *) NULL); } return(GetFirstImageInList(image)); } /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % R e g i s t e r G R A D I E N T I m a g e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % RegisterGRADIENTImage() adds attributes for the GRADIENT image format % to the list of supported formats. The attributes include the image format % tag, a method to read and/or write the format, whether the format % supports the saving of more than one frame to the same file or blob, % whether the format supports native in-memory I/O, and a brief % description of the format. % % The format of the RegisterGRADIENTImage method is: % % size_t RegisterGRADIENTImage(void) % */ ModuleExport size_t RegisterGRADIENTImage(void) { MagickInfo *entry; entry=AcquireMagickInfo("GRADIENT","GRADIENT", "Gradual linear passing from one shade to another"); entry->decoder=(DecodeImageHandler *) ReadGRADIENTImage; entry->flags^=CoderAdjoinFlag; entry->flags|=CoderRawSupportFlag; entry->format_type=ImplicitFormatType; (void) RegisterMagickInfo(entry); entry=AcquireMagickInfo("GRADIENT","RADIAL-GRADIENT", "Gradual radial passing from one shade to another"); entry->decoder=(DecodeImageHandler *) ReadGRADIENTImage; entry->flags^=CoderAdjoinFlag; entry->flags|=CoderRawSupportFlag; entry->format_type=ImplicitFormatType; (void) RegisterMagickInfo(entry); return(MagickImageCoderSignature); } /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % U n r e g i s t e r G R A D I E N T I m a g e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % UnregisterGRADIENTImage() removes format registrations made by the % GRADIENT module from the list of supported formats. % % The format of the UnregisterGRADIENTImage method is: % % UnregisterGRADIENTImage(void) % */ ModuleExport void UnregisterGRADIENTImage(void) { (void) UnregisterMagickInfo("RADIAL-GRADIENT"); (void) UnregisterMagickInfo("GRADIENT"); }