/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
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%   A c q u i r e A u t h e n t i c C a c h e V i e w                         %
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%
%  AcquireAuthenticCacheView() acquires an authentic view into the pixel cache.
%
%  The format of the AcquireAuthenticCacheView method is:
%
%      CacheView *AcquireAuthenticCacheView(const Image *image,
%        ExceptionInfo *exception)
%
%  A description of each parameter follows:
%
%    o image: the image.
%
%    o exception: return any errors or warnings in this structure.
%
*/
MagickExport CacheView *AcquireAuthenticCacheView(const Image *image,
  ExceptionInfo *exception)
{
  CacheView
    *restrict cache_view;

  cache_view=AcquireVirtualCacheView(image,exception);
  (void) SyncImagePixelCache(cache_view->image,exception);
  return(cache_view);
}
Example #2
0
/*
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%                                                                             %
%   A c q u i r e A u t h e n t i c C a c h e V i e w                         %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  AcquireAuthenticCacheView() acquires an authentic view into the pixel cache.
%
%  The format of the AcquireAuthenticCacheView method is:
%
%      CacheView *AcquireAuthenticCacheView(const Image *image,
%        ExceptionInfo *exception)
%
%  A description of each parameter follows:
%
%    o image: the image.
%
%    o exception: return any errors or warnings in this structure.
%
*/
MagickExport CacheView *AcquireAuthenticCacheView(const Image *image,
  ExceptionInfo *exception)
{
  CacheView
    *cache_view;

  MagickBooleanType
    status;

  cache_view=AcquireVirtualCacheView(image,exception);
  status=SyncImagePixelCache(cache_view->image,exception);
  if (status == MagickFalse)
    ThrowFatalException(CacheFatalError,"UnableToAcquireCacheView");
  return(cache_view);
}
Example #3
0
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
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%                                                                             %
%   S e t I m a g e A l p h a C h a n n e l                                   %
%                                                                             %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  SetImageAlphaChannel() activates, deactivates, resets, or sets the alpha
%  channel.
%
%  The format of the SetImageAlphaChannel method is:
%
%      MagickBooleanType SetImageAlphaChannel(Image *image,
%        const AlphaChannelType alpha_type)
%
%  A description of each parameter follows:
%
%    o image: the image.
%
%    o alpha_type:  The alpha channel type: ActivateAlphaChannel,
%      CopyAlphaChannel, DeactivateAlphaChannel, ExtractAlphaChannel,
%      OpaqueAlphaChannel, ResetAlphaChannel, SetAlphaChannel,
%      ShapeAlphaChannel, and TransparentAlphaChannel.
%
*/
MagickExport MagickBooleanType SetImageAlphaChannel(Image *image,
  const AlphaChannelType alpha_type)
{
  MagickBooleanType
    status;

  assert(image != (Image *) NULL);
  if (image->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
  assert(image->signature == MagickSignature);
  status=MagickTrue;
  switch (alpha_type)
  {
    case ActivateAlphaChannel:
    {
      image->matte=MagickTrue;
      break;
    }
    case BackgroundAlphaChannel:
    {
      CacheView
        *image_view;

      ExceptionInfo
        *exception;

      IndexPacket
        index;

      MagickBooleanType
        status;

      MagickPixelPacket
        background;

      PixelPacket
        pixel;

      ssize_t
        y;

      /*
        Set transparent pixels to background color.
      */
      if (image->matte == MagickFalse)
        break;
      if (SetImageStorageClass(image,DirectClass) == MagickFalse)
        break;
      GetMagickPixelPacket(image,&background);
      SetMagickPixelPacket(image,&image->background_color,(const IndexPacket *)
        NULL,&background);
      if (image->colorspace == CMYKColorspace)
        ConvertRGBToCMYK(&background);
      index=0;
      SetPixelPacket(image,&background,&pixel,&index);
      status=MagickTrue;
      exception=(&image->exception);
      image_view=AcquireAuthenticCacheView(image,exception);
      #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 IndexPacket
          *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;
      break;
    }
    case ExtractAlphaChannel:
    {
      status=SeparateImageChannel(image,TrueAlphaChannel);
      image->matte=MagickFalse;
      break;
    }
    case RemoveAlphaChannel:
    case FlattenAlphaChannel:
    {
      CacheView
        *image_view;

      ExceptionInfo
        *exception;

      IndexPacket
        index;

      MagickBooleanType
        status;

      MagickPixelPacket
        background;

      PixelPacket
        pixel;

      ssize_t
        y;

      /*
        Flatten image pixels over the background pixels.
      */
      if (image->matte == MagickFalse)
        break;
      if (SetImageStorageClass(image,DirectClass) == MagickFalse)
        break;
      GetMagickPixelPacket(image,&background);
      SetMagickPixelPacket(image,&image->background_color,(const IndexPacket *)
        NULL,&background);
      if (image->colorspace == CMYKColorspace)
        ConvertRGBToCMYK(&background);
      index=0;
      SetPixelPacket(image,&background,&pixel,&index);
      status=MagickTrue;
      exception=(&image->exception);
      image_view=AcquireAuthenticCacheView(image,exception);
      #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 IndexPacket
          *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++)
        {
          double
            gamma,
            opacity;

          gamma=1.0-QuantumScale*QuantumScale*q->opacity*pixel.opacity;
          opacity=(double) QuantumRange*(1.0-gamma);
          gamma=PerceptibleReciprocal(gamma);
          q->red=ClampToQuantum(gamma*MagickOver_((MagickRealType) q->red,
            (MagickRealType) q->opacity,(MagickRealType) pixel.red,
            (MagickRealType) pixel.opacity));
          q->green=ClampToQuantum(gamma*MagickOver_((MagickRealType) q->green,
            (MagickRealType) q->opacity,(MagickRealType) pixel.green,
            (MagickRealType) pixel.opacity));
          q->blue=ClampToQuantum(gamma*MagickOver_((MagickRealType) q->blue,
            (MagickRealType) q->opacity,(MagickRealType) pixel.blue,
            (MagickRealType) pixel.opacity));
          q->opacity=ClampToQuantum(opacity);
          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 ResetAlphaChannel: /* deprecated */
    case OpaqueAlphaChannel:
    {
      status=SetImageOpacity(image,OpaqueOpacity);
      break;
    }
    case SetAlphaChannel:
    {
      if (image->matte == MagickFalse)
        status=SetImageOpacity(image,OpaqueOpacity);
      break;
    }
    case TransparentAlphaChannel:
    {
      status=SetImageOpacity(image,TransparentOpacity);
      break;
    }
    case UndefinedAlphaChannel:
      break;
  }
  if (status == MagickFalse)
    return(status);
  return(SyncImagePixelCache(image,&image->exception));
}
Example #4
0
MagickExport MagickBooleanType SetImageAlphaChannel(Image *image,
  const AlphaChannelOption alpha_type,ExceptionInfo *exception)
{
  CacheView
    *image_view;

  MagickBooleanType
    status;

  ssize_t
    y;

  assert(image != (Image *) NULL);
  if (image->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
  assert(image->signature == MagickSignature);
  status=MagickTrue;
  switch (alpha_type)
  {
    case ActivateAlphaChannel:
    {
      image->alpha_trait=BlendPixelTrait;
      break;
    }
    case AssociateAlphaChannel:
    {
      /*
        Associate alpha.
      */
      status=SetImageStorageClass(image,DirectClass,exception);
      if (status == MagickFalse)
        break;
      image_view=AcquireAuthenticCacheView(image,exception);
#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 Quantum
          *restrict q;

        register ssize_t
          x;

        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++)
        {
          double
            Sa;
  
          register ssize_t
            i;
  
          if (GetPixelReadMask(image,q) == 0)
            {
              q+=GetPixelChannels(image);
              continue;
            }
          Sa=QuantumScale*GetPixelAlpha(image,q);
          for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
          {
            PixelChannel channel=GetPixelChannelChannel(image,i);
            PixelTrait traits=GetPixelChannelTraits(image,channel);
            if ((traits & UpdatePixelTrait) == 0)
              continue;
            q[i]=ClampToQuantum(Sa*q[i]);
          }
          q+=GetPixelChannels(image);
        }
        if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
          status=MagickFalse;
      }
      image_view=DestroyCacheView(image_view);
      image->alpha_trait=CopyPixelTrait;
      return(status);
    }
    case BackgroundAlphaChannel:
    {
      /*
        Set transparent pixels to background color.
      */
      if (image->alpha_trait != BlendPixelTrait)
        break;
      status=SetImageStorageClass(image,DirectClass,exception);
      if (status == MagickFalse)
        break;
      image_view=AcquireAuthenticCacheView(image,exception);
#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 Quantum
          *restrict q;

        register ssize_t
          x;

        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++)
        {
          if (GetPixelAlpha(image,q) == TransparentAlpha)
            {
              SetPixelInfoPixel(image,&image->background_color,q);
              SetPixelChannel(image,AlphaPixelChannel,TransparentAlpha,q);
            }
          q+=GetPixelChannels(image);
        }
        if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
          status=MagickFalse;
      }
      image_view=DestroyCacheView(image_view);
      return(status);
    }
    case CopyAlphaChannel:
    case ShapeAlphaChannel:
    {
      /*
        Copy pixel intensity to the alpha channel.
      */
      status=CompositeImage(image,image,IntensityCompositeOp,MagickTrue,0,0,
        exception);
      if (alpha_type == ShapeAlphaChannel)
        (void) LevelImageColors(image,&image->background_color,
          &image->background_color,MagickTrue,exception);
      break;
    }
    case DeactivateAlphaChannel:
    {
      image->alpha_trait=CopyPixelTrait;
      break;
    }
    case DisassociateAlphaChannel:
    {
      /*
        Disassociate alpha.
      */
      status=SetImageStorageClass(image,DirectClass,exception);
      if (status == MagickFalse)
        break;
      image->alpha_trait=BlendPixelTrait;
      image_view=AcquireAuthenticCacheView(image,exception);
#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 Quantum
          *restrict q;

        register ssize_t
          x;

        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++)
        {
          double
            gamma, 
            Sa;

          register ssize_t
            i;

          if (GetPixelReadMask(image,q) == 0)
            {
              q+=GetPixelChannels(image);
              continue;
            }
          Sa=QuantumScale*GetPixelAlpha(image,q);
          gamma=PerceptibleReciprocal(Sa);
          for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
          {
            PixelChannel channel=GetPixelChannelChannel(image,i);
            PixelTrait traits=GetPixelChannelTraits(image,channel);
            if ((traits & UpdatePixelTrait) == 0)
              continue;
            q[i]=ClampToQuantum(gamma*q[i]);
          }
          q+=GetPixelChannels(image);
        }
        if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
          status=MagickFalse;
      }
      image_view=DestroyCacheView(image_view);
      return(status);
    }
    case DiscreteAlphaChannel:
    {
      image->alpha_trait=UpdatePixelTrait;
      break;
    }
    case ExtractAlphaChannel:
    {
      status=CompositeImage(image,image,AlphaCompositeOp,MagickTrue,0,0,
        exception);
      image->alpha_trait=CopyPixelTrait;
      break;
    }
    case OpaqueAlphaChannel:
    {
      status=SetImageAlpha(image,OpaqueAlpha,exception);
      break;
    }
    case RemoveAlphaChannel:
    {
      /*
        Remove transparency.
      */
      if (image->alpha_trait != BlendPixelTrait)
        break;
      status=SetImageStorageClass(image,DirectClass,exception);
      if (status == MagickFalse)
        break;
      image_view=AcquireAuthenticCacheView(image,exception);
#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 Quantum
          *restrict q;

        register ssize_t
          x;

        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++)
        {
          FlattenPixelInfo(image,&image->background_color,
            image->background_color.alpha,q,(double)
            GetPixelAlpha(image,q),q);
          q+=GetPixelChannels(image);
        }
        if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
          status=MagickFalse;
      }
      image_view=DestroyCacheView(image_view);
      image->alpha_trait=image->background_color.alpha_trait;
      return(status);
    }
    case SetAlphaChannel:
    {
      if (image->alpha_trait != BlendPixelTrait)
        status=SetImageAlpha(image,OpaqueAlpha,exception);
      break;
    }
    case TransparentAlphaChannel:
    {
      status=SetImageAlpha(image,TransparentAlpha,exception);
      break;
    }
    case UndefinedAlphaChannel:
      break;
  }
  if (status == MagickFalse)
    return(status);
  return(SyncImagePixelCache(image,exception));
}