C++ SyncCacheViewAuthenticPixels函数代码示例

MAGICK_NET_EXPORT void PixelCollection_SetArea(CacheView *instance, const size_t x, const  size_t y, const size_t width, const size_t height, const Quantum *values, const size_t length, ExceptionInfo **exception)
{
  const Quantum
    *q;

  const Image
    *image;

  size_t
    len,
    r,
    size;

  Quantum
    *pixels;

  MAGICK_NET_GET_EXCEPTION;
  image = GetCacheViewImage(instance);
  q = values;
  size = image->number_channels*width;
  for (r = 0; r < height; r++)
  {
    pixels = QueueCacheViewAuthenticPixels(instance, x, y + r, width, 1, exceptionInfo);
    if (pixels == (Quantum *)NULL)
      break;
    len = length - (size*r);
    memcpy(pixels, q, (size < len ? size : len)*sizeof(*pixels));
    if (SyncCacheViewAuthenticPixels(instance, exceptionInfo) == MagickFalse)
      break;
    if (size > len)
      break;
    q += size;
  }
  MAGICK_NET_SET_EXCEPTION;
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
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%   P i x e l S y n c I t e r a t o r                                         %
%                                                                             %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  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)
{
  MagickBooleanType
    status;

  register ssize_t
    x;

  register Quantum
    *_magickcore_restrict pixels;

  assert(iterator != (const PixelIterator *) NULL);
  assert(iterator->signature == MagickWandSignature);
  if (iterator->debug != MagickFalse)
    (void) LogMagickEvent(WandEvent,GetMagickModule(),"%s",iterator->name);
  status=SetCacheViewStorageClass(iterator->view,DirectClass,
    iterator->exception);
  if (status == MagickFalse)
    return(MagickFalse);
  pixels=GetCacheViewAuthenticPixels(iterator->view,iterator->region.x,
    iterator->region.y+iterator->y,iterator->region.width,1,
    iterator->exception);
  if (pixels == (Quantum *) NULL)
    return(MagickFalse);
  for (x=0; x < (ssize_t) iterator->region.width; x++)
  {
    PixelGetQuantumPixel(GetCacheViewImage(iterator->view),
      iterator->pixel_wands[x],pixels);
    pixels+=GetPixelChannels(GetCacheViewImage(iterator->view));
  }
  if (SyncCacheViewAuthenticPixels(iterator->view,iterator->exception) == MagickFalse)
    return(MagickFalse);
  return(MagickTrue);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%     C y c l e C o l o r m a p I m a g e                                     %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  CycleColormap() displaces an image's colormap by a given number of
%  positions.  If you cycle the colormap a number of times you can produce
%  a psychodelic effect.
%
%  WARNING: this assumes an images colormap is in a well know and defined
%  order. Currently Imagemagick has no way of setting that order.
%
%  The format of the CycleColormapImage method is:
%
%      MagickBooleanType CycleColormapImage(Image *image,const ssize_t displace,
%        ExceptionInfo *exception)
%
%  A description of each parameter follows:
%
%    o image: the image.
%
%    o displace:  displace the colormap this amount.
%
%    o exception: return any errors or warnings in this structure.
%
*/
MagickExport MagickBooleanType CycleColormapImage(Image *image,
  const ssize_t displace,ExceptionInfo *exception)
{
  CacheView
    *image_view;

  MagickBooleanType
    status;

  ssize_t
    y;

  assert(image != (Image *) NULL);
  assert(image->signature == MagickCoreSignature);
  if (image->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
  if (image->storage_class == DirectClass)
    (void) SetImageType(image,PaletteType,exception);
  status=MagickTrue;
  image_view=AcquireAuthenticCacheView(image,exception);
#if defined(MAGICKCORE_OPENMP_SUPPORT)
  #pragma omp parallel for schedule(static,4) \
    magick_threads(image,image,1,1)
#endif
  for (y=0; y < (ssize_t) image->rows; y++)
  {
    register ssize_t
      x;

    register Quantum
      *restrict q;

    ssize_t
      index;

    if (status == MagickFalse)
      continue;
    q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
    if (q == (Quantum *) NULL)
      {
        status=MagickFalse;
        continue;
      }
    for (x=0; x < (ssize_t) image->columns; x++)
    {
      index=(ssize_t) (GetPixelIndex(image,q)+displace) % image->colors;
      if (index < 0)
        index+=(ssize_t) image->colors;
      SetPixelIndex(image,(Quantum) index,q);
      SetPixelViaPixelInfo(image,image->colormap+(ssize_t) index,q);
      q+=GetPixelChannels(image);
    }
    if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
      status=MagickFalse;
  }
  image_view=DestroyCacheView(image_view);
  return(status);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   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
    *restrict indexes;

  register ssize_t
    x;

  register PixelPacket
    *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);
}

//.........这里部分代码省略.........
          *restrict indexes;

        register PixelPacket
          *restrict q;

        register ssize_t
          x;

        if (status == MagickFalse)
          continue;
        q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,
          exception);
        if (q == (PixelPacket *) NULL)
          {
            status=MagickFalse;
            continue;
          }
        for (x=0; x < (ssize_t) image->columns; x++)
        {
          if (q->opacity == TransparentOpacity)
            {
              SetPixelRed(q,pixel.red);
              SetPixelGreen(q,pixel.green);
              SetPixelBlue(q,pixel.blue);
            }
          q++;
        }
        if (image->colorspace == CMYKColorspace)
          {
            indexes=GetCacheViewAuthenticIndexQueue(image_view);
            for (x=0; x < (ssize_t) image->columns; x++)
              SetPixelIndex(indexes+x,index);
          }
        if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
          status=MagickFalse;
      }
      image_view=DestroyCacheView(image_view);
      return(status);
    }
    case CopyAlphaChannel:
    case ShapeAlphaChannel:
    {
      /*
        Special usage case for SeparateImageChannel(): copy grayscale color to
        the alpha channel.
      */
      status=SeparateImageChannel(image,GrayChannels);
      image->matte=MagickTrue; /* make sure transparency is now on! */
      if (alpha_type == ShapeAlphaChannel)
        {
          MagickPixelPacket
            background;

          /*
            Reset all color channels to background color.
          */
          GetMagickPixelPacket(image,&background);
          SetMagickPixelPacket(image,&(image->background_color),(IndexPacket *)
            NULL,&background);
          (void) LevelColorsImage(image,&background,&background,MagickTrue);
        }
      break;
    }
    case DeactivateAlphaChannel:
    {
      image->matte=MagickFalse;

//.........这里部分代码省略.........
#if defined(MAGICKCORE_OPENMP_SUPPORT)
      #pragma omp parallel for schedule(static,4) shared(status) \
        magick_threads(image,image,1,1)
#endif
      for (i=0; i < (ssize_t) image->colors; i++)
      {
        if ((GetPixelRedTraits(image) & UpdatePixelTrait) != 0)
          image->colormap[i].red=(double) ScaleAnyToQuantum(ScaleQuantumToAny(
            ClampToQuantum(image->colormap[i].red),range),range);
        if ((GetPixelGreenTraits(image) & UpdatePixelTrait) != 0)
          image->colormap[i].green=(double) ScaleAnyToQuantum(ScaleQuantumToAny(
            ClampToQuantum(image->colormap[i].green),range),range);
        if ((GetPixelBlueTraits(image) & UpdatePixelTrait) != 0)
          image->colormap[i].blue=(double) ScaleAnyToQuantum(ScaleQuantumToAny(
            ClampToQuantum(image->colormap[i].blue),range),range);
        if ((GetPixelAlphaTraits(image) & UpdatePixelTrait) != 0)
          image->colormap[i].alpha=(double) ScaleAnyToQuantum(ScaleQuantumToAny(
            ClampToQuantum(image->colormap[i].alpha),range),range);
      }
    }
  status=MagickTrue;
  image_view=AcquireAuthenticCacheView(image,exception);
#if !defined(MAGICKCORE_HDRI_SUPPORT)
  if (QuantumRange <= MaxMap)
    {
      Quantum
        *depth_map;

      register ssize_t
        i;

      /*
        Scale pixels to desired (optimized with depth map).
      */
      depth_map=(Quantum *) AcquireQuantumMemory(MaxMap+1,sizeof(*depth_map));
      if (depth_map == (Quantum *) NULL)
        ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
      for (i=0; i <= (ssize_t) MaxMap; i++)
        depth_map[i]=ScaleAnyToQuantum(ScaleQuantumToAny((Quantum) i,range),
          range);
#if defined(MAGICKCORE_OPENMP_SUPPORT)
      #pragma omp parallel for schedule(static,4) shared(status) \
        magick_threads(image,image,image->rows,1)
#endif
      for (y=0; y < (ssize_t) image->rows; y++)
      {
        register ssize_t
          x;

        register Quantum
          *restrict q;

        if (status == MagickFalse)
          continue;
        q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,
          exception);
        if (q == (Quantum *) NULL)
          {
            status=MagickFalse;
            continue;
          }
        for (x=0; x < (ssize_t) image->columns; x++)
        {
          register ssize_t
            i;

          if (GetPixelReadMask(image,q) == 0)
            {
              q+=GetPixelChannels(image);
              continue;
            }
          for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
          {
            PixelChannel
              channel;

            PixelTrait
              traits;

            channel=GetPixelChannelChannel(image,i);
            traits=GetPixelChannelTraits(image,channel);
            if ((traits == UndefinedPixelTrait) ||
                (channel == IndexPixelChannel) || (channel == ReadMaskPixelChannel))
              continue;
            q[i]=depth_map[ScaleQuantumToMap(q[i])];
          }
          q+=GetPixelChannels(image);
        }
        if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
          {
            status=MagickFalse;
            continue;
          }
      }
      image_view=DestroyCacheView(image_view);
      depth_map=(Quantum *) RelinquishMagickMemory(depth_map);
      if (status != MagickFalse)
        image->depth=depth;
      return(status);
    }

// Transfers the image view pixels to the image.
void Magick::Pixels::sync ( void )
{
  if( !SyncCacheViewAuthenticPixels( _view, &_exception ) )
    throwException(  _exception );
}

//.........这里部分代码省略.........
        {
          id=n++;
          if (n > (ssize_t) MaxColormapSize)
            break;
          status=SetMatrixElement(equivalences,offset,0,&id);
        }
      else
        {
          status=GetMatrixElement(equivalences,id,0,&id);
          status=SetMatrixElement(equivalences,offset,0,&id);
        }
      if (x < object[id].bounding_box.x)
        object[id].bounding_box.x=x;
      if (x > (ssize_t) object[id].bounding_box.width)
        object[id].bounding_box.width=(size_t) x;
      if (y < object[id].bounding_box.y)
        object[id].bounding_box.y=y;
      if (y > (ssize_t) object[id].bounding_box.height)
        object[id].bounding_box.height=(size_t) y;
      object[id].color.red+=GetPixelRed(image,p);
      object[id].color.green+=GetPixelGreen(image,p);
      object[id].color.blue+=GetPixelBlue(image,p);
      object[id].color.black+=GetPixelBlack(image,p);
      object[id].color.alpha+=GetPixelAlpha(image,p);
      object[id].centroid.x+=x;
      object[id].centroid.y+=y;
      object[id].area++;
      SetPixelIndex(component_image,(Quantum) id,q);
      p+=GetPixelChannels(image);
      q+=GetPixelChannels(component_image);
    }
    if (n > (ssize_t) MaxColormapSize)
      break;
    if (SyncCacheViewAuthenticPixels(component_view,exception) == MagickFalse)
      status=MagickFalse;
    if (image->progress_monitor != (MagickProgressMonitor) NULL)
      {
        MagickBooleanType
          proceed;

        proceed=SetImageProgress(image,ConnectedComponentsImageTag,progress++,
          image->rows);
        if (proceed == MagickFalse)
          status=MagickFalse;
      }
  }
  component_view=DestroyCacheView(component_view);
  image_view=DestroyCacheView(image_view);
  equivalences=DestroyMatrixInfo(equivalences);
  if (n > (ssize_t) MaxColormapSize)
    {
      object=(CCObjectInfo *) RelinquishMagickMemory(object);
      component_image=DestroyImage(component_image);
      ThrowImageException(ResourceLimitError,"TooManyObjects");
    }
  component_image->colors=(size_t) n;
  for (i=0; i < (ssize_t) component_image->colors; i++)
  {
    object[i].bounding_box.width-=(object[i].bounding_box.x-1);
    object[i].bounding_box.height-=(object[i].bounding_box.y-1);
    object[i].color.red=object[i].color.red/object[i].area;
    object[i].color.green=object[i].color.green/object[i].area;
    object[i].color.blue=object[i].color.blue/object[i].area;
    object[i].color.alpha=object[i].color.alpha/object[i].area;
    object[i].color.black=object[i].color.black/object[i].area;
    object[i].centroid.x=object[i].centroid.x/object[i].area;

static MagickBooleanType InverseFourierTransform(FourierInfo *fourier_info,
  fftw_complex *fourier,Image *image,ExceptionInfo *exception)
{
  CacheView
    *image_view;

  double
    *source;

  fftw_plan
    fftw_c2r_plan;

  register IndexPacket
    *indexes;

  register PixelPacket
    *q;

  register ssize_t
    i,
    x;

  ssize_t
    y;

  source=(double *) AcquireQuantumMemory((size_t) fourier_info->height,
    fourier_info->width*sizeof(*source));
  if (source == (double *) NULL)
    {
      (void) ThrowMagickException(exception,GetMagickModule(),
        ResourceLimitError,"MemoryAllocationFailed","`%s'",image->filename);
      return(MagickFalse);
    }
#if defined(MAGICKCORE_OPENMP_SUPPORT)
  #pragma omp critical (MagickCore_InverseFourierTransform)
#endif
  {
    fftw_c2r_plan=fftw_plan_dft_c2r_2d(fourier_info->width,fourier_info->height,
      fourier,source,FFTW_ESTIMATE);
    fftw_execute(fftw_c2r_plan);
    fftw_destroy_plan(fftw_c2r_plan);
  }
  i=0L;
  image_view=AcquireAuthenticCacheView(image,exception);
  for (y=0L; y < (ssize_t) fourier_info->height; y++)
  {
    if (y >= (ssize_t) image->rows)
      break;
    q=GetCacheViewAuthenticPixels(image_view,0L,y,fourier_info->width >
      image->columns ? image->columns : fourier_info->width,1UL,exception);
    if (q == (PixelPacket *) NULL)
      break;
    indexes=GetCacheViewAuthenticIndexQueue(image_view);
    for (x=0L; x < (ssize_t) fourier_info->width; x++)
    {
      if (x < (ssize_t) image->columns)
        switch (fourier_info->channel)
        {
          case RedChannel:
          default:
          {
            SetPixelRed(q,ClampToQuantum(QuantumRange*source[i]));
            break;
          }
          case GreenChannel:
          {
            SetPixelGreen(q,ClampToQuantum(QuantumRange*source[i]));
            break;
          }
          case BlueChannel:
          {
            SetPixelBlue(q,ClampToQuantum(QuantumRange*source[i]));
            break;
          }
          case OpacityChannel:
          {
            SetPixelOpacity(q,ClampToQuantum(QuantumRange*source[i]));
            break;
          }
          case IndexChannel:
          {
            SetPixelIndex(indexes+x,ClampToQuantum(QuantumRange*source[i]));
            break;
          }
          case GrayChannels:
          {
            SetPixelGray(q,ClampToQuantum(QuantumRange*source[i]));
            break;
          }
        }
      i++;
      q++;
    }
    if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
      break;
  }
  image_view=DestroyCacheView(image_view);
  source=(double *) RelinquishMagickMemory(source);
  return(MagickTrue);
}

//.........这里部分代码省略.........
        HighlightFactor+(MagickRealType) foreground*(QuantumRange-
        HighlightFactor)));
      q->green=ClampToQuantum(QuantumScale*((MagickRealType) q->green*
        HighlightFactor+(MagickRealType) foreground*(QuantumRange-
        HighlightFactor)));
      q->blue=ClampToQuantum(QuantumScale*((MagickRealType) q->blue*
        HighlightFactor+(MagickRealType) foreground*(QuantumRange-
        HighlightFactor)));
      q++;
    }
    for ( ; x < (ssize_t) (image->columns-y); x++)
    {
      q->red=ClampToQuantum(QuantumScale*((MagickRealType) q->red*
        AccentuateFactor+(MagickRealType) foreground*(QuantumRange-
        AccentuateFactor)));
      q->green=ClampToQuantum(QuantumScale*((MagickRealType) q->green*
        AccentuateFactor+(MagickRealType) foreground*(QuantumRange-
        AccentuateFactor)));
      q->blue=ClampToQuantum(QuantumScale*((MagickRealType) q->blue*
        AccentuateFactor+(MagickRealType) foreground*(QuantumRange-
        AccentuateFactor)));
      q++;
    }
    for ( ; x < (ssize_t) image->columns; x++)
    {
      q->red=ClampToQuantum(QuantumScale*((MagickRealType) q->red*ShadowFactor+
        (MagickRealType) background*(QuantumRange-ShadowFactor)));
      q->green=ClampToQuantum(QuantumScale*((MagickRealType) q->green*
        ShadowFactor+(MagickRealType) background*(QuantumRange-ShadowFactor)));
      q->blue=ClampToQuantum(QuantumScale*((MagickRealType) q->blue*
        ShadowFactor+(MagickRealType) background*(QuantumRange-ShadowFactor)));
      q++;
    }
    if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
      status=MagickFalse;
    if (image->progress_monitor != (MagickProgressMonitor) NULL)
      {
        MagickBooleanType
          proceed;

        proceed=SetImageProgress(image,RaiseImageTag,progress++,image->rows);
        if (proceed == MagickFalse)
          status=MagickFalse;
      }
  }
#if defined(MAGICKCORE_OPENMP_SUPPORT)
  #pragma omp parallel for schedule(dynamic,4) shared(progress,status) omp_throttle(1)
#endif
  for (y=(ssize_t) raise_info->height; y < (ssize_t) (image->rows-raise_info->height); y++)
  {
    register ssize_t
      x;

    register PixelPacket
      *restrict q;

    if (status == MagickFalse)
      continue;
    q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
    if (q == (PixelPacket *) NULL)
      {
        status=MagickFalse;
        continue;
      }
    for (x=0; x < (ssize_t) raise_info->width; x++)
    {

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%     C y c l e C o l o r m a p I m a g e                                     %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  CycleColormap() displaces an image's colormap by a given number of
%  positions.  If you cycle the colormap a number of times you can produce
%  a psychodelic effect.
%
%  The format of the CycleColormapImage method is:
%
%      MagickBooleanType CycleColormapImage(Image *image,const long displace)
%
%  A description of each parameter follows:
%
%    o image: the image.
%
%    o displace:  displace the colormap this amount.
%
*/
MagickExport MagickBooleanType CycleColormapImage(Image *image,
  const long displace)
{
  CacheView
    *image_view;

  ExceptionInfo
    *exception;

  long
    y;

  MagickBooleanType
    status;

  assert(image != (Image *) NULL);
  assert(image->signature == MagickSignature);
  if (image->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
  if (image->storage_class == DirectClass)
    (void) SetImageType(image,PaletteType);
  status=MagickTrue;
  exception=(&image->exception);
  image_view=AcquireCacheView(image);
#if defined(MAGICKCORE_OPENMP_SUPPORT)
  #pragma omp parallel for schedule(static) shared(status)
#endif
  for (y=0; y < (long) image->rows; y++)
  {
    long
      index;

    register IndexPacket
      *restrict indexes;

    register long
      x;

    register PixelPacket
      *restrict q;

    if (status == MagickFalse)
      continue;
    q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
    if (q == (PixelPacket *) NULL)
      {
        status=MagickFalse;
        continue;
      }
    indexes=GetCacheViewAuthenticIndexQueue(image_view);
    for (x=0; x < (long) image->columns; x++)
    {
      index=(long) (indexes[x]+displace) % image->colors;
      if (index < 0)
        index+=image->colors;
      indexes[x]=(IndexPacket) index;
      q->red=image->colormap[index].red;
      q->green=image->colormap[index].green;
      q->blue=image->colormap[index].blue;
      q++;
    }
    if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
      status=MagickFalse;
  }
  image_view=DestroyCacheView(image_view);
  return(status);
}

MagickExport MagickBooleanType SortColormapByIntensity(Image *image)
{
  CacheView
    *image_view;

  ExceptionInfo
    *exception;

  long
    y;

  MagickBooleanType
    status;

  register long
    i;

  unsigned short
    *pixels;

  assert(image != (Image *) NULL);
  if (image->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
  assert(image->signature == MagickSignature);
  if (image->storage_class != PseudoClass)
    return(MagickTrue);
  /*
    Allocate memory for pixel indexes.
  */
  pixels=(unsigned short *) AcquireQuantumMemory((size_t) image->colors,
    sizeof(*pixels));
  if (pixels == (unsigned short *) NULL)
    ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
      image->filename);
  /*
    Assign index values to colormap entries.
  */
#if defined(MAGICKCORE_OPENMP_SUPPORT)
  #pragma omp parallel for schedule(dynamic,4) shared(status)
#endif
  for (i=0; i < (long) image->colors; i++)
    image->colormap[i].opacity=(IndexPacket) i;
  /*
    Sort image colormap by decreasing color popularity.
  */
  qsort((void *) image->colormap,(size_t) image->colors,
    sizeof(*image->colormap),IntensityCompare);
  /*
    Update image colormap indexes to sorted colormap order.
  */
#if defined(MAGICKCORE_OPENMP_SUPPORT)
  #pragma omp parallel for schedule(dynamic,4) shared(status)
#endif
  for (i=0; i < (long) image->colors; i++)
    pixels[(long) image->colormap[i].opacity]=(unsigned short) i;
  status=MagickTrue;
  exception=(&image->exception);
  image_view=AcquireCacheView(image);
  for (y=0; y < (long) image->rows; y++)
  {
    IndexPacket
      index;

    register long
      x;

    register IndexPacket
      *restrict indexes;

    register PixelPacket
      *restrict q;

    q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
    if (q == (PixelPacket *) NULL)
      {
        status=MagickFalse;
        continue;
      }
    indexes=GetCacheViewAuthenticIndexQueue(image_view);
    for (x=0; x < (long) image->columns; x++)
    {
      index=(IndexPacket) pixels[(long) indexes[x]];
      indexes[x]=index;
      *q++=image->colormap[(long) index];
    }
    if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
      status=MagickFalse;
    if (status == MagickFalse)
      break;
  }
  image_view=DestroyCacheView(image_view);
  pixels=(unsigned short *) RelinquishMagickMemory(pixels);
  return(status);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   S e t I m a g e V i e w I t e r a t o r                                   %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  SetImageViewIterator() iterates over the image view in parallel and calls
%  your set method for each scanline of the view.  The pixel extent is
%  confined to the image canvas-- that is no negative offsets or widths or
%  heights that exceed the image dimension.  The pixels are initiallly
%  undefined and any settings you make in the callback method are automagically
%  synced back to your image.
%
%  The callback signature is:
%
%      MagickBooleanType SetImageViewMethod(ImageView *destination,
%        const ssize_t y,const int thread_id,void *context)
%
%  Use this pragma if the view is not single threaded:
%
%    #pragma omp critical
%
%  to define a section of code in your callback set method that must be
%  executed by a single thread at a time.
%
%  The format of the SetImageViewIterator method is:
%
%      MagickBooleanType SetImageViewIterator(ImageView *destination,
%        SetImageViewMethod set,void *context)
%
%  A description of each parameter follows:
%
%    o destination: the image view.
%
%    o set: the set callback method.
%
%    o context: the user defined context.
%
*/
MagickExport MagickBooleanType SetImageViewIterator(ImageView *destination,
  SetImageViewMethod set,void *context)
{
  ExceptionInfo
    *exception;

  Image
    *destination_image;

  MagickBooleanType
    status;

  MagickOffsetType
    progress;

  ssize_t
    y;

  assert(destination != (ImageView *) NULL);
  assert(destination->signature == MagickSignature);
  if (set == (SetImageViewMethod) NULL)
    return(MagickFalse);
  destination_image=destination->image;
  if (SetImageStorageClass(destination_image,DirectClass) == MagickFalse)
    return(MagickFalse);
  status=MagickTrue;
  progress=0;
  exception=destination->exception;
#if defined(MAGICKCORE_OPENMP_SUPPORT)
  #pragma omp parallel for schedule(static,1) shared(progress,status) num_threads(destination->number_threads)
#endif
  for (y=destination->extent.y; y < (ssize_t) destination->extent.height; y++)
  {
    const int
      id = GetOpenMPThreadId();

    MagickBooleanType
      sync;

    register PixelPacket
      *__restrict__ pixels;

    if (status == MagickFalse)
      continue;
    pixels=GetCacheViewAuthenticPixels(destination->view,destination->extent.x,
      y,destination->extent.width,1,exception);
    if (pixels == (PixelPacket *) NULL)
      {
        InheritException(destination->exception,GetCacheViewException(
          destination->view));
        status=MagickFalse;
        continue;
      }
    if (set(destination,y,id,context) == MagickFalse)
      status=MagickFalse;
    sync=SyncCacheViewAuthenticPixels(destination->view,exception);
//.........这里部分代码省略.........

//.........这里部分代码省略.........
%
%    o source: the source image view.
%
%    o destination: the destination image view.
%
%    o transfer: the transfer callback method.
%
%    o context: the user defined context.
%
*/
MagickExport MagickBooleanType TransferImageViewIterator(ImageView *source,
  ImageView *destination,TransferImageViewMethod transfer,void *context)
{
  Image
    *destination_image,
    *source_image;

  MagickBooleanType
    status;

  MagickOffsetType
    progress;

  size_t
    height,
    width;

  ssize_t
    y;

  assert(source != (ImageView *) NULL);
  assert(source->signature == MagickSignature);
  if (transfer == (TransferImageViewMethod) NULL)
    return(MagickFalse);
  source_image=source->image;
  destination_image=destination->image;
  status=SetImageStorageClass(destination_image,DirectClass,
    destination->exception);
  if (status == MagickFalse)
    return(MagickFalse);
  status=MagickTrue;
  progress=0;
  height=source->extent.height-source->extent.y;
  width=source->extent.width-source->extent.x;
#if defined(MAGICKCORE_OPENMP_SUPPORT)
  #pragma omp parallel for schedule(static) shared(progress,status) \
    dynamic_number_threads(source_image,width,height,1)
#endif
  for (y=source->extent.y; y < (ssize_t) source->extent.height; y++)
  {
    const int
      id = GetOpenMPThreadId();

    MagickBooleanType
      sync;

    register const Quantum
      *restrict pixels;

    register Quantum
      *restrict destination_pixels;

    if (status == MagickFalse)
      continue;
    pixels=GetCacheViewVirtualPixels(source->view,source->extent.x,y,
      source->extent.width,1,source->exception);
    if (pixels == (const Quantum *) NULL)
      {
        status=MagickFalse;
        continue;
      }
    destination_pixels=GetCacheViewAuthenticPixels(destination->view,
      destination->extent.x,y,destination->extent.width,1,
      destination->exception);
    if (destination_pixels == (Quantum *) NULL)
      {
        status=MagickFalse;
        continue;
      }
    if (transfer(source,destination,y,id,context) == MagickFalse)
      status=MagickFalse;
    sync=SyncCacheViewAuthenticPixels(destination->view,destination->exception);
    if (sync == MagickFalse)
      status=MagickFalse;
    if (source_image->progress_monitor != (MagickProgressMonitor) NULL)
      {
        MagickBooleanType
          proceed;

#if defined(MAGICKCORE_OPENMP_SUPPORT)
        #pragma omp critical (MagickCore_TransferImageViewIterator)
#endif
        proceed=SetImageProgress(source_image,source->description,progress++,
          source->extent.height);
        if (proceed == MagickFalse)
          status=MagickFalse;
      }
  }
  return(status);
}

//.........这里部分代码省略.........
%  A description of each parameter follows:
%
%    o destination: the wand view.
%
%    o set: the set callback method.
%
%    o context: the user defined context.
%
*/
WandExport MagickBooleanType SetWandViewIterator(WandView *destination,
  SetWandViewMethod set,void *context)
{
  ExceptionInfo
    *exception;

  Image
    *destination_image;

  MagickBooleanType
    status;

  MagickOffsetType
    progress;

  ssize_t
    y;

  assert(destination != (WandView *) NULL);
  assert(destination->signature == WandSignature);
  if (set == (SetWandViewMethod) NULL)
    return(MagickFalse);
  destination_image=destination->wand->images;
  if (SetImageStorageClass(destination_image,DirectClass) == MagickFalse)
    return(MagickFalse);
  status=MagickTrue;
  progress=0;
  exception=destination->exception;
#if defined(MAGICKCORE_OPENMP_SUPPORT)
  #pragma omp parallel for schedule(static,1) shared(progress,status) num_threads(destination->number_threads)
#endif
  for (y=destination->extent.y; y < (ssize_t) destination->extent.height; y++)
  {
    const int
      id = GetOpenMPThreadId();

    MagickBooleanType
      sync;

    register IndexPacket
      *restrict indexes;

    register ssize_t
      x;

    register PixelPacket
      *restrict pixels;

    if (status == MagickFalse)
      continue;
    pixels=GetCacheViewAuthenticPixels(destination->view,destination->extent.x,
      y,destination->extent.width,1,exception);
    if (pixels == (PixelPacket *) NULL)
      {
        InheritException(destination->exception,GetCacheViewException(
          destination->view));
        status=MagickFalse;
        continue;
      }
    indexes=GetCacheViewAuthenticIndexQueue(destination->view);
    if (set(destination,y,id,context) == MagickFalse)
      status=MagickFalse;
    for (x=0; x < (ssize_t) destination->extent.width; x++)
      PixelGetQuantumColor(destination->pixel_wands[id][x],pixels+x);
    if (destination_image->colorspace == CMYKColorspace)
      for (x=0; x < (ssize_t) destination->extent.width; x++)
        SetPixelBlack(indexes+x,PixelGetBlackQuantum(
          destination->pixel_wands[id][x]));
    sync=SyncCacheViewAuthenticPixels(destination->view,exception);
    if (sync == MagickFalse)
      {
        InheritException(destination->exception,GetCacheViewException(
          destination->view));
        status=MagickFalse;
      }
    if (destination_image->progress_monitor != (MagickProgressMonitor) NULL)
      {
        MagickBooleanType
          proceed;

#if defined(MAGICKCORE_OPENMP_SUPPORT)
  #pragma omp critical (MagickWand_SetWandViewIterator)
#endif
        proceed=SetImageProgress(destination_image,destination->description,
          progress++,destination->extent.height);
        if (proceed == MagickFalse)
          status=MagickFalse;
      }
  }
  return(status);
}