coders/tile.c

/*
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%                        TTTTT  IIIII  L      EEEEE                           %
%                          T      I    L      E                               %
%                          T      I    L      EEE                             %
%                          T      I    L      E                               %
%                          T    IIIII  LLLLL  EEEEE                           %
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%                     Return A Tiled Image Using Texture.                     %
%                                                                             %
%                              Software Design                                %
%                                John Cristy                                  %
%                                 July 1992                                   %
%                                                                             %
%                                                                             %
%  Copyright 1999-2011 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                                            %
%                                                                             %
%    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 "MagickCore/studio.h"
#include "MagickCore/blob.h"
#include "MagickCore/blob-private.h"
#include "MagickCore/constitute.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/monitor.h"
#include "MagickCore/monitor-private.h"
#include "MagickCore/quantum-private.h"
#include "MagickCore/static.h"
#include "MagickCore/string_.h"
#include "MagickCore/module.h"

/*
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%   R e a d T I L E I m a g e                                                 %
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%
%  ReadTILEImage tiles a texture on an image.  It allocates the
%  memory necessary for the new Image structure and returns a pointer to the
%  new image.
%
%  The format of the ReadTILEImage method is:
%
%      Image *ReadTILEImage(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 *ReadTILEImage(const ImageInfo *image_info,
  ExceptionInfo *exception)
{
  Image
    *image,
    *tile_image;

  ImageInfo
    *read_info;

  /*
    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);
  read_info=CloneImageInfo(image_info);
  SetImageInfoBlob(read_info,(void *) NULL,0);
  *read_info->magick='\0';
  tile_image=ReadImage(read_info,exception);
  read_info=DestroyImageInfo(read_info);
  if (tile_image == (Image *) NULL)
    return((Image *) NULL);
  image=AcquireImage(image_info,exception);
  if ((image->columns == 0) || (image->rows == 0))
    ThrowReaderException(OptionError,"MustSpecifyImageSize");
  if (*image_info->filename == '\0')
    ThrowReaderException(OptionError,"MustSpecifyAnImageName");
  image->matte=tile_image->matte;
  if (image->matte != MagickFalse)
    (void) SetImageBackgroundColor(image);
  (void) CopyMagickString(image->filename,image_info->filename,MaxTextExtent);
  if (LocaleCompare(tile_image->magick,"PATTERN") == 0)
    {
      tile_image->tile_offset.x=0;
      tile_image->tile_offset.y=0;
    }
  (void) TextureImage(image,tile_image);
  tile_image=DestroyImage(tile_image);
  return(GetFirstImageInList(image));
}

/*
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%   R e g i s t e r T I L E I m a g e                                         %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  RegisterTILEImage() adds attributes for the TILE 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 RegisterTILEImage method is:
%
%      size_t RegisterTILEImage(void)
%
*/
ModuleExport size_t RegisterTILEImage(void)
{
  MagickInfo
    *entry;

  entry=SetMagickInfo("TILE");
  entry->decoder=(DecodeImageHandler *) ReadTILEImage;
  entry->raw=MagickTrue;
  entry->endian_support=MagickTrue;
  entry->format_type=ImplicitFormatType;
  entry->description=ConstantString("Tile image with a texture");
  entry->module=ConstantString("TILE");
  (void) RegisterMagickInfo(entry);
  return(MagickImageCoderSignature);
}

/*
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%   U n r e g i s t e r T I L E I m a g e                                     %
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%
%  UnregisterTILEImage() removes format registrations made by the
%  TILE module from the list of supported formats.
%
%  The format of the UnregisterTILEImage method is:
%
%      UnregisterTILEImage(void)
%
*/
ModuleExport void UnregisterTILEImage(void)
{
  (void) UnregisterMagickInfo("TILE");
}