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DEFINITIONS
This source file includes following definitions.
- ReadGRADIENTImage
- RegisterGRADIENTImage
- UnregisterGRADIENTImage
/*
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% G R R A A D D I E NN N T %
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% Read An Image Filled Using Gradient. %
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% Software Design %
% John Cristy %
% July 1992 %
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% Copyright 1999-2013 ImageMagick Studio LLC, a non-profit organization %
% dedicated to making software imaging solutions freely available. %
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% You may not use this file except in compliance with the License. You may %
% obtain a copy of the License at %
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% 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. %
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*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/blob-private.h"
#include "magick/channel.h"
#include "magick/color.h"
#include "magick/color-private.h"
#include "magick/colorspace-private.h"
#include "magick/draw.h"
#include "magick/exception.h"
#include "magick/exception-private.h"
#include "magick/image.h"
#include "magick/image-private.h"
#include "magick/list.h"
#include "magick/magick.h"
#include "magick/memory_.h"
#include "magick/paint.h"
#include "magick/pixel-accessor.h"
#include "magick/pixel-private.h"
#include "magick/quantum-private.h"
#include "magick/static.h"
#include "magick/string_.h"
#include "magick/module.h"
#include "magick/studio.h"
/*
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% R e a d G R A D I E N T I m a g e %
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% 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:
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% Image *ReadGRADIENTImage(const ImageInfo *image_info,
% ExceptionInfo *exception)
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% A description of each parameter follows:
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% o image_info: the image info.
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% o exception: return any errors or warnings in this structure.
%
*/
static Image *ReadGRADIENTImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
char
colorname[MaxTextExtent];
MagickBooleanType
icc_color,
status;
MagickPixelPacket
start_pixel,
stop_pixel;
PixelPacket
start_color,
stop_color;
Image
*image;
/*
Initialize Image structure.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
if (image_info->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
image_info->filename);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickSignature);
image=AcquireImage(image_info);
if ((image->columns == 0) || (image->rows == 0))
ThrowReaderException(OptionError,"MustSpecifyImageSize");
(void) SetImageOpacity(image,(Quantum) TransparentOpacity);
(void) CopyMagickString(image->filename,image_info->filename,MaxTextExtent);
(void) CopyMagickString(colorname,image_info->filename,MaxTextExtent);
(void) sscanf(image_info->filename,"%[^-]",colorname);
icc_color=MagickFalse;
if (LocaleCompare(colorname,"icc") == 0)
{
(void) ConcatenateMagickString(colorname,"-",MaxTextExtent);
(void) sscanf(image_info->filename,"%*[^-]-%[^-]",colorname+4);
icc_color=MagickTrue;
}
if (QueryColorDatabase(colorname,&start_color,exception) == MagickFalse)
{
image=DestroyImage(image);
return((Image *) NULL);
}
(void) QueryMagickColor(colorname,&start_pixel,exception);
(void) CopyMagickString(colorname,"white",MaxTextExtent);
if (GetPixelLuma(image,&start_color) > (QuantumRange/2))
(void) CopyMagickString(colorname,"black",MaxTextExtent);
if (icc_color == MagickFalse)
(void) sscanf(image_info->filename,"%*[^-]-%s",colorname);
else
(void) sscanf(image_info->filename,"%*[^-]-%*[^-]-%s",colorname);
if (QueryColorDatabase(colorname,&stop_color,exception) == MagickFalse)
{
image=DestroyImage(image);
return((Image *) NULL);
}
(void) QueryMagickColor(colorname,&stop_pixel,exception);
(void) SetImageColorspace(image,start_pixel.colorspace);
status=GradientImage(image,LocaleCompare(image_info->magick,"GRADIENT") == 0 ?
LinearGradient : RadialGradient,PadSpread,&start_color,&stop_color);
if (status == MagickFalse)
{
image=DestroyImageList(image);
return((Image *) NULL);
}
if ((start_pixel.matte == MagickFalse) && (stop_pixel.matte == MagickFalse))
(void) SetImageAlphaChannel(image,DeactivateAlphaChannel);
return(GetFirstImageInList(image));
}
/*
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% R e g i s t e r G R A D I E N T I m a g e %
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% 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.
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% The format of the RegisterGRADIENTImage method is:
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% size_t RegisterGRADIENTImage(void)
%
*/
ModuleExport size_t RegisterGRADIENTImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("GRADIENT");
entry->decoder=(DecodeImageHandler *) ReadGRADIENTImage;
entry->adjoin=MagickFalse;
entry->raw=MagickTrue;
entry->format_type=ImplicitFormatType;
entry->description=ConstantString("Gradual linear passing from one shade to "
"another");
entry->module=ConstantString("GRADIENT");
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("RADIAL-GRADIENT");
entry->decoder=(DecodeImageHandler *) ReadGRADIENTImage;
entry->adjoin=MagickFalse;
entry->raw=MagickTrue;
entry->format_type=ImplicitFormatType;
entry->description=ConstantString("Gradual radial passing from one shade to "
"another");
entry->module=ConstantString("GRADIENT");
(void) RegisterMagickInfo(entry);
return(MagickImageCoderSignature);
}
/*
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% U n r e g i s t e r G R A D I E N T I m a g e %
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% 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");
}