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/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% N N U U L L %
% NN N U U L L %
% N N N U U L L %
% N NN U U L L %
% N N UUU LLLLL LLLLL %
% %
% %
% Read/Write ImageMagick Image Format. %
% %
% %
% Software Design %
% John Cristy %
% July 1992 %
% %
% %
% Copyright (C) 2002 ImageMagick Studio, a non-profit organization dedicated %
% to making software imaging solutions freely available. %
% %
% Permission is hereby granted, free of charge, to any person obtaining a %
% copy of this software and associated documentation files ("ImageMagick"), %
% to deal in ImageMagick without restriction, including without limitation %
% the rights to use, copy, modify, merge, publish, distribute, sublicense, %
% and/or sell copies of ImageMagick, and to permit persons to whom the %
% ImageMagick is furnished to do so, subject to the following conditions: %
% %
% The above copyright notice and this permission notice shall be included in %
% all copies or substantial portions of ImageMagick. %
% %
% The software is provided "as is", without warranty of any kind, express or %
% implied, including but not limited to the warranties of merchantability, %
% fitness for a particular purpose and noninfringement. In no event shall %
% ImageMagick Studio be liable for any claim, damages or other liability, %
% whether in an action of contract, tort or otherwise, arising from, out of %
% or in connection with ImageMagick or the use or other dealings in %
% ImageMagick. %
% %
% Except as contained in this notice, the name of the ImageMagick Studio %
% shall not be used in advertising or otherwise to promote the sale, use or %
% other dealings in ImageMagick without prior written authorization from the %
% ImageMagick Studio. %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick.h"
#include "define.h"
/*
Forward declarations.
*/
static unsigned int
WriteNULLImage(const ImageInfo *,Image *);
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e a d N U L L I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method ReadNULLImage creates a constant image and initializes it to the
% X server color 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 ReadNULLImage method is:
%
% Image *ReadNULLImage(const ImageInfo *image_info,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: Method ReadNULLImage 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 an ImageInfo structure.
%
% o exception: return any errors or warnings in this structure.
%
%
*/
static Image *ReadNULLImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
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->columns=1;
if (image->rows == 0)
image->rows=1;
(void) strncpy(image->filename,image_info->filename,MaxTextExtent-1);
(void) QueryColorDatabase((char *) image_info->filename,
&image->background_color);
if (!AllocateImageColormap(image,1))
ThrowReaderException(ResourceLimitWarning,"Memory allocation failed",image);
image->colormap[0]=image->background_color;
SetImage(image,OpaqueOpacity);
return(image);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e g i s t e r N U L L I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method RegisterNULLImage adds attributes for the NULL 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 RegisterNULLImage method is:
%
% RegisterNULLImage(void)
%
*/
ModuleExport void RegisterNULLImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("NULL");
entry->decoder=ReadNULLImage;
entry->encoder=WriteNULLImage;
entry->adjoin=False;
entry->description=AcquireString("Constant image of uniform color");
entry->module=AcquireString("NULL");
(void) RegisterMagickInfo(entry);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r N U L L I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method UnregisterNULLImage removes format registrations made by the
% NULL module from the list of supported formats.
%
% The format of the UnregisterNULLImage method is:
%
% UnregisterNULLImage(void)
%
*/
ModuleExport void UnregisterNULLImage(void)
{
(void) UnregisterMagickInfo("NULL");
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% W r i t e N U L L I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method WriteNULLImage writes no output at all. It is useful when specified
% as an output format when profiling.
%
% The format of the WriteNULLImage method is:
%
% unsigned int WriteNULLImage(const ImageInfo *image_info,Image *image)
%
% A description of each parameter follows.
%
% o status: Always returns True.
%
% o image_info: Specifies a pointer to an ImageInfo structure.
%
% o image: A pointer to a Image structure.
%
%
*/
static unsigned int WriteNULLImage(const ImageInfo *image_info,Image *image)
{
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
return(True);
}
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