/*

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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 Image Of Uniform Color.                       %

%                                                                             %

%                              Software Design                                %

%                                   Cristy                                    %

%                                 July 1992                                   %

%                                                                             %

%                                                                             %

%  Copyright @ 1999 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                                            %

%                                                                             %

%    https://imagemagick.org/license/                                         %

%                                                                             %

%  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/blob.h"

#include "MagickCore/blob-private.h"

#include "MagickCore/cache.h"

#include "MagickCore/color.h"

#include "MagickCore/color-private.h"

#include "MagickCore/colorspace-private.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/pixel-accessor.h"

#include "MagickCore/quantum-private.h"

#include "MagickCore/static.h"

#include "MagickCore/string_.h"

#include "MagickCore/module.h"

/*

  Forward declarations.

*/

static MagickBooleanType

  WriteNULLImage(const ImageInfo *,Image *,ExceptionInfo *)

    magick_attribute((__pure__));

/*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

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%                                                                             %

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%   R e a d N U L L I m a g e                                                 %

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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

%  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_info: the image info.

%

%    o exception: return any errors or warnings in this structure.

%

*/

static Image *ReadNULLImage(const ImageInfo *image_info,

  ExceptionInfo *exception)

{

  Image

    *image;

  MagickBooleanType

    status;

  PixelInfo

    background;

  ssize_t

    x;

  Quantum

    *q;

  ssize_t

    y;

  /*

    Initialize Image structure.

  */

  assert(image_info != (const ImageInfo *) NULL);

  assert(image_info->signature == MagickCoreSignature);

  assert(exception != (ExceptionInfo *) NULL);

  assert(exception->signature == MagickCoreSignature);

  if (IsEventLogging() != MagickFalse)

    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",

      image_info->filename);

  image=AcquireImage(image_info,exception);

  if (image->columns == 0)

    image->columns=1;

  if (image->rows == 0)

    image->rows=1;

  image->alpha_trait=BlendPixelTrait;

  status=SetImageExtent(image,image->columns,image->rows,exception);

  if (status == MagickFalse)

    return(DestroyImageList(image));

  ConformPixelInfo(image,&image->background_color,&background,exception);

  background.alpha=(double) TransparentAlpha;

  for (y=0; y < (ssize_t) image->rows; y++)

  {

    q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);

    if (q == (Quantum *) NULL)

      break;

    for (x=0; x < (ssize_t) image->columns; x++)

    {

      SetPixelViaPixelInfo(image,&background,q);

      q+=(ptrdiff_t) GetPixelChannels(image);

    }

    if (SyncAuthenticPixels(image,exception) == MagickFalse)

      break;

  }

  return(GetFirstImageInList(image));

}

/*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%                                                                             %

%                                                                             %

%                                                                             %

%   R e g i s t e r N U L L I m a g e                                         %

%                                                                             %

%                                                                             %

%                                                                             %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

%  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:

%

%      size_t RegisterNULLImage(void)

%

*/

ModuleExport size_t RegisterNULLImage(void)

{

  MagickInfo

    *entry;

  entry=AcquireMagickInfo("NULL","NULL","Constant image of uniform color");

  entry->decoder=(DecodeImageHandler *) ReadNULLImage;

  entry->encoder=(EncodeImageHandler *) WriteNULLImage;

  entry->flags^=CoderAdjoinFlag;

  entry->format_type=ImplicitFormatType;

  (void) RegisterMagickInfo(entry);

  return(MagickImageCoderSignature);

}

/*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%                                                                             %

%                                                                             %

%                                                                             %

%   U n r e g i s t e r N U L L I m a g e                                     %

%                                                                             %

%                                                                             %

%                                                                             %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

%  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");

}

/*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%                                                                             %

%                                                                             %

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%   W r i t e N U L L I m a g e                                               %

%                                                                             %

%                                                                             %

%                                                                             %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

%  WriteNULLImage writes no output at all. It is useful when specified

%  as an output format when profiling.

%

%  The format of the WriteNULLImage method is:

%

%      MagickBooleanType WriteNULLImage(const ImageInfo *image_info,

%        Image *image,ExceptionInfo *exception)

%

%  A description of each parameter follows.

%

%    o image_info: the image info.

%

%    o image:  The image.

%

%    o exception: return any errors or warnings in this structure.

%

*/

static MagickBooleanType WriteNULLImage(const ImageInfo *image_info,

  Image *image,ExceptionInfo *exception)

{

  assert(image_info != (const ImageInfo *) NULL);

  assert(image_info->signature == MagickCoreSignature);

  assert(image != (Image *) NULL);

  assert(image->signature == MagickCoreSignature);

  assert(exception != (ExceptionInfo *) NULL);

  if (IsEventLogging() != MagickFalse)

    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);

  (void) image_info;

  (void) exception;

  return(MagickTrue);

}