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gradient.c
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/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% 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 1999-2015 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 %
% %
% http://www.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 *ReadGRADIENTImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
char
colorname[MagickPathExtent+4];
Image
*image;
ImageInfo
*read_info;
MagickBooleanType
icc_color,
status;
StopInfo
*stops;
/*
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);
read_info=CloneImageInfo(image_info);
SetImageInfoBlob(read_info,(void *) NULL,0);
(void) CopyMagickString(colorname,image_info->filename,MagickPathExtent);
(void) sscanf(image_info->filename,"%[^-]",colorname);
(void) FormatLocaleString(read_info->filename,MagickPathExtent,"xc:%s",
colorname);
image=ReadImage(read_info,exception);
read_info=DestroyImageInfo(read_info);
if (image == (Image *) NULL)
return((Image *) NULL);
(void) SetImageAlpha(image,(Quantum) TransparentAlpha,exception);
(void) CopyMagickString(image->filename,image_info->filename,MagickPathExtent);
icc_color=MagickFalse;
if (LocaleCompare(colorname,"icc") == 0)
{
(void) ConcatenateMagickString(colorname,"-",MagickPathExtent);
(void) sscanf(image_info->filename,"%*[^-]-%[^-]",colorname+4);
icc_color=MagickTrue;
}
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(colorname,AllCompliance,&stops[0].color,exception);
if (status == MagickFalse)
{
stops=(StopInfo *) RelinquishMagickMemory(stops);
image=DestroyImage(image);
return((Image *) NULL);
}
(void) SetImageColorspace(image,stops[0].color.colorspace,exception);
(void) CopyMagickString(colorname,"white",MagickPathExtent);
if (GetPixelInfoIntensity(image,&stops[0].color) > (QuantumRange/2.0))
(void) CopyMagickString(colorname,"black",MagickPathExtent);
if (icc_color == MagickFalse)
(void) sscanf(image_info->filename,"%*[^-]-%[^-]",colorname);
else
(void) sscanf(image_info->filename,"%*[^-]-%*[^-]-%[^-]",colorname);
status=QueryColorCompliance(colorname,AllCompliance,&stops[1].color,exception);
if (status == MagickFalse)
{
stops=(StopInfo *) RelinquishMagickMemory(stops);
image=DestroyImage(image);
return((Image *) NULL);
}
image->alpha_trait=stops[0].color.alpha_trait;
if (stops[1].color.alpha_trait != UndefinedPixelTrait)
image->alpha_trait=stops[1].color.alpha_trait;
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");
}