root/wand/pixel-iterator.c

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DEFINITIONS

This source file includes following definitions.
  1. ClearPixelIterator
  2. ClonePixelIterator
  3. DestroyPixelIterator
  4. IsPixelIterator
  5. NewPixelIterator
  6. PixelClearIteratorException
  7. NewPixelRegionIterator
  8. PixelGetCurrentIteratorRow
  9. PixelGetIteratorException
  10. PixelGetIteratorExceptionType
  11. PixelGetIteratorRow
  12. PixelGetNextIteratorRow
  13. PixelGetPreviousRow
  14. PixelGetPreviousIteratorRow
  15. PixelResetIterator
  16. PixelSetFirstIteratorRow
  17. PixelSetIteratorRow
  18. PixelSetLastIteratorRow
  19. PixelSyncIterator

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%                      PPPP   IIIII  X   X  EEEEE  L                          %
%                      P   P    I     X X   E      L                          %
%                      PPPP     I      X    EEE    L                          %
%                      P        I     X X   E      L                          %
%                      P      IIIII  X   X  EEEEE  LLLLL                      %
%                                                                             %
%            IIIII  TTTTT EEEEE  RRRR    AAA   TTTTT   OOO   RRRR             %
%              I      T   E      R   R  A   A    T    O   O  R   R            %
%              I      T   EEE    RRRR   AAAAA    T    O   O  RRRR             %
%              I      T   E      R R    A   A    T    O   O  R R              %
%            IIIII    T   EEEEE  R  R   A   A    T     OOO   R  R             %
%                                                                             %
%                                                                             %
%                   ImageMagick Image Pixel Iterator Methods                  %
%                                                                             %
%                              Software Design                                %
%                                   Cristy                                    %
%                                March 2003                                   %
%                                                                             %
%                                                                             %
%  Copyright 1999-2016 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.                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
%
*/

/*
  Include declarations.
*/
#include "wand/studio.h"
#include "wand/MagickWand.h"
#include "wand/magick-wand-private.h"
#include "wand/pixel-iterator.h"
#include "wand/pixel-wand.h"
#include "wand/wand.h"

/*
  Define declarations.
*/
#define PixelIteratorId  "PixelIterator"

/*
  Typedef declarations.
*/
struct _PixelIterator
{
  size_t
    id;

  char
    name[MaxTextExtent];

  ExceptionInfo
    *exception;

  CacheView
    *view;

  RectangleInfo
    region;

  MagickBooleanType
    active;

  ssize_t
    y;

  PixelWand
    **pixel_wands;

  MagickBooleanType
    debug;

  size_t
    signature;
};

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   C l e a r P i x e l I t e r a t o r                                       %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  ClearPixelIterator() clear resources associated with a PixelIterator.
%
%  The format of the ClearPixelIterator method is:
%
%      void ClearPixelIterator(PixelIterator *iterator)
%
%  A description of each parameter follows:
%
%    o iterator: the pixel iterator.
%
*/
WandExport void ClearPixelIterator(PixelIterator *iterator)
{
  assert(iterator != (const PixelIterator *) NULL);
  assert(iterator->signature == WandSignature);
  if (iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",iterator->name);
  iterator->pixel_wands=DestroyPixelWands(iterator->pixel_wands,
    iterator->region.width);
  ClearMagickException(iterator->exception);
  iterator->pixel_wands=NewPixelWands(iterator->region.width);
  iterator->active=MagickFalse;
  iterator->y=0;
  iterator->debug=IsEventLogging();
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   C l o n e P i x e l I t e r a t o r                                       %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  ClonePixelIterator() makes an exact copy of the specified iterator.
%
%  The format of the ClonePixelIterator method is:
%
%      PixelIterator *ClonePixelIterator(const PixelIterator *iterator)
%
%  A description of each parameter follows:
%
%    o iterator: the magick iterator.
%
*/
WandExport PixelIterator *ClonePixelIterator(const PixelIterator *iterator)
{
  PixelIterator
    *clone_iterator;

  assert(iterator != (PixelIterator *) NULL);
  assert(iterator->signature == WandSignature);
  if (iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",iterator->name);
  clone_iterator=(PixelIterator *) AcquireMagickMemory(sizeof(*clone_iterator));
  if (clone_iterator == (PixelIterator *) NULL)
    ThrowWandFatalException(ResourceLimitFatalError,"MemoryAllocationFailed",
      iterator->name);
  (void) ResetMagickMemory(clone_iterator,0,sizeof(*clone_iterator));
  clone_iterator->id=AcquireWandId();
  (void) FormatLocaleString(clone_iterator->name,MaxTextExtent,"%s-%.20g",
    PixelIteratorId,(double) clone_iterator->id);
  clone_iterator->exception=AcquireExceptionInfo();
  InheritException(clone_iterator->exception,iterator->exception);
  clone_iterator->view=CloneCacheView(iterator->view);
  clone_iterator->region=iterator->region;
  clone_iterator->active=iterator->active;
  clone_iterator->y=iterator->y;
  clone_iterator->pixel_wands=ClonePixelWands((const PixelWand **)
    iterator->pixel_wands,iterator->region.width);
  clone_iterator->debug=iterator->debug;
  if (clone_iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",
      clone_iterator->name);
  clone_iterator->signature=WandSignature;
  return(clone_iterator);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   D e s t r o y P i x e l I t e r a t o r                                   %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  DestroyPixelIterator() deallocates resources associated with a PixelIterator.
%
%  The format of the DestroyPixelIterator method is:
%
%      PixelIterator *DestroyPixelIterator(PixelIterator *iterator)
%
%  A description of each parameter follows:
%
%    o iterator: the pixel iterator.
%
*/
WandExport PixelIterator *DestroyPixelIterator(PixelIterator *iterator)
{
  assert(iterator != (const PixelIterator *) NULL);
  assert(iterator->signature == WandSignature);
  if (iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",iterator->name);
  iterator->view=DestroyCacheView(iterator->view);
  iterator->pixel_wands=DestroyPixelWands(iterator->pixel_wands,
    iterator->region.width);
  iterator->exception=DestroyExceptionInfo(iterator->exception);
  iterator->signature=(~WandSignature);
  RelinquishWandId(iterator->id);
  iterator=(PixelIterator *) RelinquishMagickMemory(iterator);
  return(iterator);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   I s P i x e l I t e r a t o r                                             %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  IsPixelIterator() returns MagickTrue if the iterator is verified as a pixel
%  iterator.
%
%  The format of the IsPixelIterator method is:
%
%      MagickBooleanType IsPixelIterator(const PixelIterator *iterator)
%
%  A description of each parameter follows:
%
%    o iterator: the magick iterator.
%
*/
WandExport MagickBooleanType IsPixelIterator(const PixelIterator *iterator)
{
  size_t
    length;

  if (iterator == (const PixelIterator *) NULL)
    return(MagickFalse);
  if (iterator->signature != WandSignature)
    return(MagickFalse);
  length=strlen(PixelIteratorId);
  if (LocaleNCompare(iterator->name,PixelIteratorId,length) != 0)
    return(MagickFalse);
  return(MagickTrue);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N e w P i x e l I t e r a t o r                                           %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NewPixelIterator() returns a new pixel iterator.
%
%  The format of the NewPixelIterator method is:
%
%      PixelIterator *NewPixelIterator(MagickWand *wand)
%
%  A description of each parameter follows:
%
%    o wand: the magick wand.
%
*/
WandExport PixelIterator *NewPixelIterator(MagickWand *wand)
{
  const char
    *quantum;

  ExceptionInfo
    *exception;

  Image
    *image;

  PixelIterator
    *iterator;

  size_t
    depth;

  CacheView
    *view;

  depth=MAGICKCORE_QUANTUM_DEPTH;
  quantum=GetMagickQuantumDepth(&depth);
  if (depth != MAGICKCORE_QUANTUM_DEPTH)
    ThrowWandFatalException(WandError,"QuantumDepthMismatch",quantum);
  assert(wand != (MagickWand *) NULL);
  image=GetImageFromMagickWand(wand);
  if (image == (Image *) NULL)
    return((PixelIterator *) NULL);
  exception=AcquireExceptionInfo();
  view=AcquireVirtualCacheView(image,exception);
  if (view == (CacheView *) NULL)
    return((PixelIterator *) NULL);
  iterator=(PixelIterator *) AcquireMagickMemory(sizeof(*iterator));
  if (iterator == (PixelIterator *) NULL)
    ThrowWandFatalException(ResourceLimitFatalError,"MemoryAllocationFailed",
      GetExceptionMessage(errno));
  (void) ResetMagickMemory(iterator,0,sizeof(*iterator));
  iterator->id=AcquireWandId();
  (void) FormatLocaleString(iterator->name,MaxTextExtent,"%s-%.20g",
    PixelIteratorId,(double) iterator->id);
  iterator->exception=exception;
  iterator->view=view;
  SetGeometry(image,&iterator->region);
  iterator->region.width=image->columns;
  iterator->region.height=image->rows;
  iterator->region.x=0;
  iterator->region.y=0;
  iterator->pixel_wands=NewPixelWands(iterator->region.width);
  iterator->y=0;
  iterator->debug=IsEventLogging();
  if (iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",iterator->name);
  iterator->signature=WandSignature;
  return(iterator);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   P i x e l C l e a r I t e r a t o r E x c e p t i o n                     %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  PixelClearIteratorException() clear any exceptions associated with the
%  iterator.
%
%  The format of the PixelClearIteratorException method is:
%
%      MagickBooleanType PixelClearIteratorException(PixelIterator *iterator)
%
%  A description of each parameter follows:
%
%    o iterator: the pixel iterator.
%
*/
WandExport MagickBooleanType PixelClearIteratorException(
  PixelIterator *iterator)
{
  assert(iterator != (PixelIterator *) NULL);
  assert(iterator->signature == WandSignature);
  if (iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",iterator->name);
  ClearMagickException(iterator->exception);
  return(MagickTrue);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   N e w P i x e l R e g i o n I t e r a t o r                               %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  NewPixelRegionIterator() returns a new pixel iterator.
%
%  The format of the NewPixelRegionIterator method is:
%
%      PixelIterator *NewPixelRegionIterator(MagickWand *wand,const ssize_t x,
%        const ssize_t y,const size_t width,const size_t height)
%
%  A description of each parameter follows:
%
%    o wand: the magick wand.
%
%    o x,y,columns,rows:  These values define the perimeter of a region of
%      pixels.
%
*/
WandExport PixelIterator *NewPixelRegionIterator(MagickWand *wand,
  const ssize_t x,const ssize_t y,const size_t width,const size_t height)
{
  CacheView
    *view;

  const char
    *quantum;

  ExceptionInfo
    *exception;

  Image
    *image;

  PixelIterator
    *iterator;

  size_t
    depth;

  assert(wand != (MagickWand *) NULL);
  depth=MAGICKCORE_QUANTUM_DEPTH;
  quantum=GetMagickQuantumDepth(&depth);
  if (depth != MAGICKCORE_QUANTUM_DEPTH)
    ThrowWandFatalException(WandError,"QuantumDepthMismatch",quantum);
  if ((width == 0) || (height == 0))
    ThrowWandFatalException(WandError,"ZeroRegionSize",quantum);
  image=GetImageFromMagickWand(wand);
  if (image == (Image *) NULL)
    return((PixelIterator *) NULL);
  exception=AcquireExceptionInfo();
  view=AcquireVirtualCacheView(image,exception);
  if (view == (CacheView *) NULL)
    return((PixelIterator *) NULL);
  iterator=(PixelIterator *) AcquireMagickMemory(sizeof(*iterator));
  if (iterator == (PixelIterator *) NULL)
    ThrowWandFatalException(ResourceLimitFatalError,"MemoryAllocationFailed",
      wand->name);
  (void) ResetMagickMemory(iterator,0,sizeof(*iterator));
  iterator->id=AcquireWandId();
  (void) FormatLocaleString(iterator->name,MaxTextExtent,"%s-%.20g",
    PixelIteratorId,(double) iterator->id);
  iterator->exception=exception;
  iterator->view=view;
  SetGeometry(image,&iterator->region);
  iterator->region.width=width;
  iterator->region.height=height;
  iterator->region.x=x;
  iterator->region.y=y;
  iterator->pixel_wands=NewPixelWands(iterator->region.width);
  iterator->y=0;
  iterator->debug=IsEventLogging();
  if (iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",iterator->name);
  iterator->signature=WandSignature;
  return(iterator);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   P i x e l G e t C u r r e n t I t e r a t o r R o w                       %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  PixelGetCurrentIteratorRow() returns the current row as an array of pixel
%  wands from the pixel iterator.
%
%  The format of the PixelGetCurrentIteratorRow method is:
%
%      PixelWand **PixelGetCurrentIteratorRow(PixelIterator *iterator,
%        size_t *number_wands)
%
%  A description of each parameter follows:
%
%    o iterator: the pixel iterator.
%
%    o number_wands: the number of pixel wands.
%
*/
WandExport PixelWand **PixelGetCurrentIteratorRow(PixelIterator *iterator,
  size_t *number_wands)
{
  register const IndexPacket
    *indexes;

  register const PixelPacket
    *pixels;

  register ssize_t
    x;

  assert(iterator != (PixelIterator *) NULL);
  assert(iterator->signature == WandSignature);
  if (iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",iterator->name);
  *number_wands=0;
  iterator->active=MagickTrue;
  pixels=GetCacheViewVirtualPixels(iterator->view,iterator->region.x,
    iterator->region.y+iterator->y,iterator->region.width,1,
    iterator->exception);
  if (pixels == (const PixelPacket *) NULL)
    {
      InheritException(iterator->exception,GetCacheViewException(
        iterator->view));
      return((PixelWand **) NULL);
    }
  indexes=GetCacheViewVirtualIndexQueue(iterator->view);
  for (x=0; x < (ssize_t) iterator->region.width; x++)
    PixelSetQuantumColor(iterator->pixel_wands[x],pixels+x);
  if (GetCacheViewColorspace(iterator->view) == CMYKColorspace)
    for (x=0; x < (ssize_t) iterator->region.width; x++)
      PixelSetBlackQuantum(iterator->pixel_wands[x],
        GetPixelBlack(indexes+x));
  if (GetCacheViewStorageClass(iterator->view) == PseudoClass)
    for (x=0; x < (ssize_t) iterator->region.width; x++)
      PixelSetIndex(iterator->pixel_wands[x],
        GetPixelBlack(indexes+x));
  *number_wands=iterator->region.width;
  return(iterator->pixel_wands);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   P i x e l G e t I t e r a t o r E x c e p t i o n                         %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  PixelGetIteratorException() returns the severity, reason, and description of
%  any error that occurs when using other methods in this API.
%
%  The format of the PixelGetIteratorException method is:
%
%      char *PixelGetIteratorException(const PixelIterator *iterator,
%        ExceptionType *severity)
%
%  A description of each parameter follows:
%
%    o iterator: the pixel iterator.
%
%    o severity: the severity of the error is returned here.
%
*/
WandExport char *PixelGetIteratorException(const PixelIterator *iterator,
  ExceptionType *severity)
{
  char
    *description;

  assert(iterator != (const PixelIterator *) NULL);
  assert(iterator->signature == WandSignature);
  if (iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",iterator->name);
  assert(severity != (ExceptionType *) NULL);
  *severity=iterator->exception->severity;
  description=(char *) AcquireQuantumMemory(2UL*MaxTextExtent,
    sizeof(*description));
  if (description == (char *) NULL)
    ThrowWandFatalException(ResourceLimitFatalError,"MemoryAllocationFailed",
      iterator->name);
  *description='\0';
  if (iterator->exception->reason != (char *) NULL)
    (void) CopyMagickString(description,GetLocaleExceptionMessage(
      iterator->exception->severity,iterator->exception->reason),MaxTextExtent);
  if (iterator->exception->description != (char *) NULL)
    {
      (void) ConcatenateMagickString(description," (",MaxTextExtent);
      (void) ConcatenateMagickString(description,GetLocaleExceptionMessage(
        iterator->exception->severity,iterator->exception->description),
        MaxTextExtent);
      (void) ConcatenateMagickString(description,")",MaxTextExtent);
    }
  return(description);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   P i x e l G e t E x c e p t i o n T y p e                                 %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  PixelGetIteratorExceptionType() the exception type associated with the
%  iterator.  If no exception has occurred, UndefinedExceptionType is returned.
%
%  The format of the PixelGetIteratorExceptionType method is:
%
%      ExceptionType PixelGetIteratorExceptionType(
%        const PixelIterator *iterator)
%
%  A description of each parameter follows:
%
%    o iterator: the magick iterator.
%
*/
WandExport ExceptionType PixelGetIteratorExceptionType(
  const PixelIterator *iterator)
{
  assert(iterator != (const PixelIterator *) NULL);
  assert(iterator->signature == WandSignature);
  if (iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",iterator->name);
  return(iterator->exception->severity);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   P i x e l G e t I t e r a t o r R o w                                     %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  PixelGetIteratorRow() returns the current pixel iterator row.
%
%  The format of the PixelGetIteratorRow method is:
%
%      MagickBooleanType PixelGetIteratorRow(PixelIterator *iterator)
%
%  A description of each parameter follows:
%
%    o iterator: the pixel iterator.
%
*/
WandExport ssize_t PixelGetIteratorRow(PixelIterator *iterator)
{
  assert(iterator != (const PixelIterator *) NULL);
  assert(iterator->signature == WandSignature);
  if (iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",iterator->name);
  return(iterator->y);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   P i x e l G e t N e x t I t e r a t o r R o w                             %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  PixelGetNextIteratorRow() returns the next row as an array of pixel wands
%  from the pixel iterator.
%
%  The format of the PixelGetNextIteratorRow method is:
%
%      PixelWand **PixelGetNextIteratorRow(PixelIterator *iterator,
%        size_t *number_wands)
%
%  A description of each parameter follows:
%
%    o iterator: the pixel iterator.
%
%    o number_wands: the number of pixel wands.
%
*/
WandExport PixelWand **PixelGetNextIteratorRow(PixelIterator *iterator,
  size_t *number_wands)
{
  register const IndexPacket
    *indexes;

  register const PixelPacket
    *pixels;

  register ssize_t
    x;

  assert(iterator != (PixelIterator *) NULL);
  assert(iterator->signature == WandSignature);
  if (iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",iterator->name);
  *number_wands=0;
  if (iterator->active != MagickFalse)
    iterator->y++;
  if (PixelSetIteratorRow(iterator,iterator->y) == MagickFalse)
    return((PixelWand **) NULL);
  pixels=GetCacheViewVirtualPixels(iterator->view,iterator->region.x,
    iterator->region.y+iterator->y,iterator->region.width,1,
    iterator->exception);
  if (pixels == (const PixelPacket *) NULL)
    {
      InheritException(iterator->exception,GetCacheViewException(
        iterator->view));
      return((PixelWand **) NULL);
    }
  indexes=GetCacheViewVirtualIndexQueue(iterator->view);
  for (x=0; x < (ssize_t) iterator->region.width; x++)
    PixelSetQuantumColor(iterator->pixel_wands[x],pixels+x);
  if (GetCacheViewColorspace(iterator->view) == CMYKColorspace)
    for (x=0; x < (ssize_t) iterator->region.width; x++)
      PixelSetBlackQuantum(iterator->pixel_wands[x],
        GetPixelBlack(indexes+x));
  if (GetCacheViewStorageClass(iterator->view) == PseudoClass)
    for (x=0; x < (ssize_t) iterator->region.width; x++)
      PixelSetIndex(iterator->pixel_wands[x],
        GetPixelIndex(indexes+x));
  *number_wands=iterator->region.width;
  return(iterator->pixel_wands);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   P i x e l G e t P r e v i o u s I t e r a t o r R o w                     %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  PixelGetPreviousIteratorRow() returns the previous row as an array of pixel
%  wands from the pixel iterator.
%
%  The format of the PixelGetPreviousIteratorRow method is:
%
%      PixelWand **PixelGetPreviousIteratorRow(PixelIterator *iterator,
%        size_t *number_wands)
%
%  A description of each parameter follows:
%
%    o iterator: the pixel iterator.
%
%    o number_wands: the number of pixel wands.
%
*/

WandExport PixelWand **PixelGetPreviousRow(PixelIterator *iterator)
{
  size_t
    number_wands;

  return(PixelGetPreviousIteratorRow(iterator,&number_wands));
}

WandExport PixelWand **PixelGetPreviousIteratorRow(PixelIterator *iterator,
  size_t *number_wands)
{
  register const IndexPacket
    *indexes;

  register const PixelPacket
    *pixels;

  register ssize_t
    x;

  assert(iterator != (PixelIterator *) NULL);
  assert(iterator->signature == WandSignature);
  if (iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",iterator->name);
  *number_wands=0;
  if (iterator->active != MagickFalse)
    iterator->y--;
  if (PixelSetIteratorRow(iterator,iterator->y) == MagickFalse)
    return((PixelWand **) NULL);
  pixels=GetCacheViewVirtualPixels(iterator->view,iterator->region.x,
    iterator->region.y+iterator->y,iterator->region.width,1,
    iterator->exception);
  if (pixels == (const PixelPacket *) NULL)
    {
      InheritException(iterator->exception,GetCacheViewException(
        iterator->view));
      return((PixelWand **) NULL);
    }
  indexes=GetCacheViewVirtualIndexQueue(iterator->view);
  for (x=0; x < (ssize_t) iterator->region.width; x++)
    PixelSetQuantumColor(iterator->pixel_wands[x],pixels+x);
  if (GetCacheViewColorspace(iterator->view) == CMYKColorspace)
    for (x=0; x < (ssize_t) iterator->region.width; x++)
      PixelSetBlackQuantum(iterator->pixel_wands[x],
        GetPixelBlack(indexes+x));
  if (GetCacheViewStorageClass(iterator->view) == PseudoClass)
    for (x=0; x < (ssize_t) iterator->region.width; x++)
      PixelSetIndex(iterator->pixel_wands[x],
        GetPixelIndex(indexes+x));
  *number_wands=iterator->region.width;
  return(iterator->pixel_wands);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   P i x e l R e s e t I t e r a t o r                                       %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  PixelResetIterator() resets the pixel iterator.  Use it in conjunction
%  with PixelGetNextIteratorRow() to iterate over all the pixels in a pixel
%  container.
%
%  The format of the PixelResetIterator method is:
%
%      void PixelResetIterator(PixelIterator *iterator)
%
%  A description of each parameter follows:
%
%    o iterator: the pixel iterator.
%
*/
WandExport void PixelResetIterator(PixelIterator *iterator)
{
  assert(iterator != (PixelIterator *) NULL);
  assert(iterator->signature == WandSignature);
  if (iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",iterator->name);
  iterator->active=MagickFalse;
  iterator->y=0;
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   P i x e l S e t F i r s t I t e r a t o r R o w                           %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  PixelSetFirstIteratorRow() sets the pixel iterator to the first pixel row.
%
%  The format of the PixelSetFirstIteratorRow method is:
%
%      void PixelSetFirstIteratorRow(PixelIterator *iterator)
%
%  A description of each parameter follows:
%
%    o iterator: the magick iterator.
%
*/
WandExport void PixelSetFirstIteratorRow(PixelIterator *iterator)
{
  assert(iterator != (PixelIterator *) NULL);
  assert(iterator->signature == WandSignature);
  if (iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",iterator->name);
  iterator->active=MagickFalse;
  iterator->y=iterator->region.y;
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   P i x e l S e t I t e r a t o r R o w                                     %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  PixelSetIteratorRow() set the pixel iterator row.
%
%  The format of the PixelSetIteratorRow method is:
%
%      MagickBooleanType PixelSetIteratorRow(PixelIterator *iterator,
%        const ssize_t row)
%
%  A description of each parameter follows:
%
%    o iterator: the pixel iterator.
%
*/
WandExport MagickBooleanType PixelSetIteratorRow(PixelIterator *iterator,
  const ssize_t row)
{
  assert(iterator != (const PixelIterator *) NULL);
  assert(iterator->signature == WandSignature);
  if (iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",iterator->name);
  if ((row < 0) || (row >= (ssize_t) iterator->region.height))
    return(MagickFalse);
  iterator->active=MagickTrue;
  iterator->y=row;
  return(MagickTrue);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   P i x e l S e t L a s t I t e r a t o r R o w                             %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  PixelSetLastIteratorRow() sets the pixel iterator to the last pixel row.
%
%  The format of the PixelSetLastIteratorRow method is:
%
%      void PixelSetLastIteratorRow(PixelIterator *iterator)
%
%  A description of each parameter follows:
%
%    o iterator: the magick iterator.
%
*/
WandExport void PixelSetLastIteratorRow(PixelIterator *iterator)
{
  assert(iterator != (PixelIterator *) NULL);
  assert(iterator->signature == WandSignature);
  if (iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",iterator->name);
  iterator->active=MagickFalse;
  iterator->y=(ssize_t) iterator->region.height-1;
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   P i x e l S y n c I t e r a t o r                                         %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  PixelSyncIterator() syncs the pixel iterator.
%
%  The format of the PixelSyncIterator method is:
%
%      MagickBooleanType PixelSyncIterator(PixelIterator *iterator)
%
%  A description of each parameter follows:
%
%    o iterator: the pixel iterator.
%
*/
WandExport MagickBooleanType PixelSyncIterator(PixelIterator *iterator)
{
  ExceptionInfo
    *exception;

  register IndexPacket
    *magick_restrict indexes;

  register ssize_t
    x;

  register PixelPacket
    *magick_restrict pixels;

  assert(iterator != (const PixelIterator *) NULL);
  assert(iterator->signature == WandSignature);
  if (iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",iterator->name);
  if (SetCacheViewStorageClass(iterator->view,DirectClass) == MagickFalse)
    return(MagickFalse);
  exception=iterator->exception;
  pixels=GetCacheViewAuthenticPixels(iterator->view,iterator->region.x,
    iterator->region.y+iterator->y,iterator->region.width,1,exception);
  if (pixels == (PixelPacket *) NULL)
    {
      InheritException(iterator->exception,GetCacheViewException(
        iterator->view));
      return(MagickFalse);
    }
  indexes=GetCacheViewAuthenticIndexQueue(iterator->view);
  for (x=0; x < (ssize_t) iterator->region.width; x++)
    PixelGetQuantumColor(iterator->pixel_wands[x],pixels+x);
  if (GetCacheViewColorspace(iterator->view) == CMYKColorspace)
    for (x=0; x < (ssize_t) iterator->region.width; x++)
      SetPixelBlack(indexes+x,PixelGetBlackQuantum(
        iterator->pixel_wands[x]));
  if (SyncCacheViewAuthenticPixels(iterator->view,exception) == MagickFalse)
    {
      InheritException(iterator->exception,GetCacheViewException(
        iterator->view));
      return(MagickFalse);
    }
  return(MagickTrue);
}

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