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/*
% Copyright (C) 2003-2020 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.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% 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 Image Of Uniform Color %
% %
% %
% Software Design %
% John Cristy %
% July 1992 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/color.h"
#include "magick/color_lookup.h"
#include "magick/colormap.h"
#include "magick/magick.h"
#include "magick/pixel_cache.h"
#include "magick/utility.h"
/*
Forward declarations.
*/
static unsigned int
WriteNULLImage(const ImageInfo *,Image *) MAGICK_FUNC_PURE;
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% 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 a ImageInfo structure.
%
% o exception: return any errors or warnings in this structure.
%
%
*/
static Image *ReadNULLImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
Image
*image;
unsigned int
status;
/*
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;
if (CheckImagePixelLimits(image, exception) != MagickPass)
ThrowReaderException(ResourceLimitError,ImagePixelLimitExceeded,image);
(void) strlcpy(image->filename,image_info->filename,MaxTextExtent);
status=QueryColorDatabase((char *) image_info->filename,
&image->background_color,exception);
if (status == MagickFail)
{
/* Promote warning to error */
exception->severity = OptionError;
DestroyImage(image);
return((Image *) NULL);
}
if (!AllocateImageColormap(image,1))
ThrowReaderException(ResourceLimitError,MemoryAllocationFailed,image);
image->colormap[0]=image->background_color;
status=SetImageEx(image,OpaqueOpacity,exception);
StopTimer(&image->timer);
if (status == MagickFail)
{
DestroyImage(image);
image=(Image *) NULL;
}
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=(DecoderHandler) ReadNULLImage;
entry->encoder=(EncoderHandler) WriteNULLImage;
entry->adjoin=False;
entry->description="Constant image of uniform color";
entry->module="NULL";
entry->coder_class=PrimaryCoderClass;
entry->extension_treatment=IgnoreExtensionTreatment;
(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 a ImageInfo structure.
%
% o image: A pointer to an 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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