/* [<][>][^][v][top][bottom][index][help] */
DEFINITIONS
This source file includes following definitions.
- ReadGRADIENTImage
- RegisterGRADIENTImage
- UnregisterGRADIENTImage
/*
% Copyright (C) 2003 GraphicsMagick Group
% Copyright (C) 2002 ImageMagick Studio
% Copyright 1991-1999 E. I. du Pont de Nemours and Company
%
% This program is covered by multiple licenses, which are described in
% Copyright.txt. You should have received a copy of Copyright.txt with this
% package; otherwise see http://www.graphicsmagick.org/www/Copyright.html.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% 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 %
% John Cristy %
% July 1992 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/color_lookup.h"
#include "magick/gradient.h"
#include "magick/magick.h"
#include "magick/utility.h"
#include "magick/studio.h"
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e a d G R A D I E N T I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method 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: Method ReadGRADIENTImage returns a pointer to the image after
% creating it. A null image is returned if there is a memory shortage
% or if the image cannot be read.
%
% o image_info: Specifies a pointer to a ImageInfo structure.
%
% o exception: return any errors or warnings in this structure.
%
%
*/
static Image *ReadGRADIENTImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
char
colorname[MaxTextExtent];
PixelPacket
start_color,
stop_color;
Image
*image;
/*
Initialize Image structure.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickSignature);
image=AllocateImage(image_info);
if ((image->columns == 0) || (image->rows == 0))
ThrowReaderException(OptionError,MustSpecifyImageSize,image);
(void) SetImage(image,OpaqueOpacity);
(void) strlcpy(image->filename,image_info->filename,MaxTextExtent);
(void) strlcpy(colorname,image_info->filename,MaxTextExtent);
(void) sscanf(image_info->filename,"%[^-]",colorname);
if (!QueryColorDatabase(colorname,&start_color,exception))
{
DestroyImage(image);
return((Image *) NULL);
}
(void) strcpy(colorname,"white");
if (PixelIntensityToQuantum(&start_color) > (0.5*MaxRGB))
(void) strcpy(colorname,"black");
(void) sscanf(image_info->filename,"%*[^-]-%s",colorname);
if (!QueryColorDatabase(colorname,&stop_color,exception))
{
DestroyImage(image);
return((Image *) NULL);
}
(void) GradientImage(image,&start_color,&stop_color);
return(image);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e g i s t e r G R A D I E N T I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method 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:
%
% RegisterGRADIENTImage(void)
%
*/
ModuleExport void RegisterGRADIENTImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("GRADIENT");
entry->decoder=(DecoderHandler) ReadGRADIENTImage;
entry->adjoin=False;
entry->raw=True;
entry->description="Gradual passing from one shade to another";
entry->module="GRADIENT";
entry->coder_class=PrimaryCoderClass;
entry->extension_treatment=IgnoreExtensionTreatment;
(void) RegisterMagickInfo(entry);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r G R A D I E N T I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method 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("GRADIENT");
}