C++ GetFirstImageInList函数代码示例

//.........这里部分代码省略.........
%  allocates the memory necessary for the new Image structure and returns a
%  pointer to the new image.
%
%  The format of the ReadHRZImage method is:
%
%      Image *ReadHRZImage(const ImageInfo *image_info,ExceptionInfo *exception)
%
%  A description of each parameter follows:
%
%    o image_info: the image info.
%
%    o exception: return any errors or warnings in this structure.
%
*/
static Image *ReadHRZImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
  Image
    *image;

  long
    y;

  MagickBooleanType
    status;

  register long
    x;

  register PixelPacket
    *q;

  register unsigned char
    *p;

  ssize_t
    count;

  size_t
    length;

  unsigned char
    *pixels;

  /*
    Open image file.
  */
  assert(image_info != (const ImageInfo *) NULL);
  assert(image_info->signature == MagickSignature);
  if (image_info->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
      image_info->filename);
  assert(exception != (ExceptionInfo *) NULL);
  assert(exception->signature == MagickSignature);
  image=AcquireImage(image_info);
  status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
  if (status == MagickFalse)
    {
      image=DestroyImageList(image);
      return((Image *) NULL);
    }
  /*
    Convert HRZ raster image to pixel packets.
  */
  image->columns=256;
  image->rows=240;
  image->depth=8;
  pixels=(unsigned char *) AcquireQuantumMemory(image->columns,
    3*sizeof(*pixels));
  if (pixels == (unsigned char *) NULL) 
    ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
  length=(size_t) (3*image->columns);
  for (y=0; y < (long) image->rows; y++)
  {
    count=ReadBlob(image,length,pixels);
    if ((size_t) count != length)
      ThrowReaderException(CorruptImageError,"UnableToReadImageData");
    p=pixels;
    q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
    if (q == (PixelPacket *) NULL)
      break;
    for (x=0; x < (long) image->columns; x++)
    {
      q->red=4*ScaleCharToQuantum(*p++);
      q->green=4*ScaleCharToQuantum(*p++);
      q->blue=4*ScaleCharToQuantum(*p++);
      q->opacity=OpaqueOpacity;
      q++;
    }
    if (SyncAuthenticPixels(image,exception) == MagickFalse)
      break;
    if (SetImageProgress(image,LoadImageTag,y,image->rows) == MagickFalse)
      break;
  }
  pixels=(unsigned char *) RelinquishMagickMemory(pixels);
  if (EOFBlob(image) != MagickFalse)
    ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
      image->filename);
  (void) CloseBlob(image);
  return(GetFirstImageInList(image));
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   R e a d X C I m a g e                                                     %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  ReadXCImage creates a constant image and initializes it to the
%  X server color as specified by the filename.  It allocates the memory
%  necessary for the new Image structure and returns a pointer to the new
%  image.
%
%  The format of the ReadXCImage method is:
%
%      Image *ReadXCImage(const ImageInfo *image_info,ExceptionInfo *exception)
%
%  A description of each parameter follows:
%
%    o image:  The image.
%
%    o image_info: the image info.
%
%    o exception: return any errors or warnings in this structure.
%
*/
static Image *ReadXCImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
  Image
    *image;

  MagickBooleanType
    status;

  PixelInfo
    pixel;

  register ssize_t
    x;

  register Quantum
    *q;

  ssize_t
    y;

  /*
    Initialize Image structure.
  */
  assert(image_info != (const ImageInfo *) NULL);
  assert(image_info->signature == MagickSignature);
  if (image_info->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
      image_info->filename);
  assert(exception != (ExceptionInfo *) NULL);
  assert(exception->signature == MagickSignature);
  image=AcquireImage(image_info,exception);
  if (image->columns == 0)
    image->columns=1;
  if (image->rows == 0)
    image->rows=1;
  (void) CopyMagickString(image->filename,image_info->filename,MaxTextExtent);
  if (*image_info->filename == '\0')
    pixel=image->background_color;
  else
    {
      status=QueryColorCompliance((char *) image_info->filename,AllCompliance,
        &pixel,exception);
      if (status == MagickFalse)
        {
          image=DestroyImage(image);
          return((Image *) NULL);
        }
    }
  (void) SetImageColorspace(image,pixel.colorspace,exception);
  image->alpha_trait=pixel.alpha_trait;
  for (y=0; y < (ssize_t) image->rows; y++)
  {
    q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
    if (q == (Quantum *) NULL)
      break;
    for (x=0; x < (ssize_t) image->columns; x++)
    {
      SetPixelInfoPixel(image,&pixel,q);
      q+=GetPixelChannels(image);
    }
    if (SyncAuthenticPixels(image,exception) == MagickFalse)
      break;
  }
  return(GetFirstImageInList(image));
}

//.........这里部分代码省略.........
  size_t
    height,
    width;

  /*
    Initialize Image structure.
  */
  assert(image_info != (const ImageInfo *) NULL);
  assert(image_info->signature == MagickSignature);
  if (image_info->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
      image_info->filename);
  assert(exception != (ExceptionInfo *) NULL);
  assert(exception->signature == MagickSignature);
  image=AcquireImage(image_info);
  (void) ResetImagePage(image,"0x0+0+0");
  property=InterpretImageProperties(image_info,image,image_info->filename);
  (void) SetImageProperty(image,"label",property);
  property=DestroyString(property);
  label=GetImageProperty(image,"label");
  draw_info=CloneDrawInfo(image_info,(DrawInfo *) NULL);
  draw_info->text=ConstantString(label);
  if (((image->columns != 0) || (image->rows != 0)) &&
      (image_info->pointsize == 0.0))
    {
      /*
        Fit label to canvas size.
      */
      status=GetMultilineTypeMetrics(image,draw_info,&metrics);
      for ( ; status != MagickFalse; draw_info->pointsize*=2.0)
      {
        width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
        height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
        if (((image->columns != 0) && (width > (image->columns+1))) ||
            ((image->rows != 0) && (height > (image->rows+1))))
          break;
        status=GetMultilineTypeMetrics(image,draw_info,&metrics);
      }
      for ( ; status != MagickFalse; draw_info->pointsize--)
      {
        width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
        height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
        if ((image->columns != 0) && (width <= (image->columns+1)) &&
           ((image->rows == 0) || (height <= (image->rows+1))))
          break;
        if ((image->rows != 0) && (height <= (image->rows+1)) &&
           ((image->columns == 0) || (width <= (image->columns+1))))
          break;
        if (draw_info->pointsize < 2.0)
          break;
        status=GetMultilineTypeMetrics(image,draw_info,&metrics);
      }
    }
  status=GetMultilineTypeMetrics(image,draw_info,&metrics);
  if (status == MagickFalse)
    {
      InheritException(exception,&image->exception);
      image=DestroyImageList(image);
      return((Image *) NULL);
    }
  if (image->columns == 0)
    image->columns=(size_t) (metrics.width+draw_info->stroke_width+1.5);
  if (image->columns == 0)
    image->columns=(size_t) (draw_info->pointsize+draw_info->stroke_width+1.5);
  if ((draw_info->gravity == UndefinedGravity) ||
      (draw_info->direction == RightToLeftDirection))
    {
      (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
        -metrics.bounds.x1+draw_info->stroke_width/2.0,metrics.ascent+
        draw_info->stroke_width/2.0);
      if (draw_info->direction == RightToLeftDirection)
        (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
          image->columns-(metrics.bounds.x2+draw_info->stroke_width/2.0),
          metrics.ascent+draw_info->stroke_width/2.0);
      draw_info->geometry=AcquireString(geometry);
    }
  if (image->rows == 0)
    image->rows=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
  if (image->rows == 0)
    image->rows=(size_t) floor(draw_info->pointsize+draw_info->stroke_width+
      0.5);
  if (SetImageBackgroundColor(image) == MagickFalse)
    {
      InheritException(exception,&image->exception);
      image=DestroyImageList(image);
      return((Image *) NULL);
    }
  (void) AnnotateImage(image,draw_info);
  if (image_info->pointsize == 0.0)
    {
      char
        pointsize[MaxTextExtent];

      (void) FormatLocaleString(pointsize,MaxTextExtent,"%.20g",
        draw_info->pointsize);
      (void) SetImageProperty(image,"label:pointsize",pointsize);
    }
  draw_info=DestroyDrawInfo(draw_info);
  return(GetFirstImageInList(image));
}

//.........这里部分代码省略.........
    p=next;
    next=NextXPMLine(p);
    (void) CopyXPMColor(key,p,MagickMin((size_t) width,MaxTextExtent-1));
    status=AddValueToSplayTree(xpm_colors,ConstantString(key),(void *) j);
    /*
      Parse color.
    */
    (void) CopyMagickString(target,"gray",MaxTextExtent);
    q=ParseXPMColor(p+width,MagickTrue);
    if (q != (char *) NULL)
      {
        while ((isspace((int) ((unsigned char) *q)) == 0) && (*q != '\0'))
          q++;
        if ((next-q) < 0)
          break;
        if (next != (char *) NULL)
          (void) CopyXPMColor(target,q,MagickMin((size_t) (next-q),
            MaxTextExtent-1));
        else
          (void) CopyMagickString(target,q,MaxTextExtent);
        q=ParseXPMColor(target,MagickFalse);
        if (q != (char *) NULL)
          *q='\0';
      }
    StripString(target);
    grey=strstr(target,"grey");
    if (grey != (char *) NULL)
      grey[2]='a';
    if (LocaleCompare(target,"none") == 0)
      {
        image->storage_class=DirectClass;
        image->matte=MagickTrue;
      }
    status=QueryColorCompliance(target,XPMCompliance,&image->colormap[j],
      exception);
    if (status == MagickFalse)
      break;
    (void) QueryMagickColorCompliance(target,XPMCompliance,&pixel,exception);
    if (image->depth < pixel.depth)
      image->depth=pixel.depth;
  }
  if (j < (ssize_t) image->colors)
    {
      xpm_colors=DestroySplayTree(xpm_colors);
      xpm_buffer=DestroyString(xpm_buffer);
      ThrowReaderException(CorruptImageError,"CorruptImage");
    }
  j=0;
  if (image_info->ping == MagickFalse)
    {
      /*
        Read image pixels.
      */
      status=SetImageExtent(image,image->columns,image->rows);
      if (status == MagickFalse)
        {
          InheritException(exception,&image->exception);
          return(DestroyImageList(image));
        }
      for (y=0; y < (ssize_t) image->rows; y++)
      {
        p=NextXPMLine(p);
        if (p == (char *) NULL)
          break;
        r=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
        if (r == (PixelPacket *) NULL)
          break;
        indexes=GetAuthenticIndexQueue(image);
        for (x=0; x < (ssize_t) image->columns; x++)
        {
          ssize_t count=CopyXPMColor(key,p,MagickMin(width,MaxTextExtent-1));
          if (count != (ssize_t) width)
            break;
          j=(ssize_t) GetValueFromSplayTree(xpm_colors,key);
          if (image->storage_class == PseudoClass)
            SetPixelIndex(indexes+x,j);
          *r=image->colormap[j];
          p+=count;
          r++;
        }
        if (x < (ssize_t) image->columns)
          break;
        if (SyncAuthenticPixels(image,exception) == MagickFalse)
          break;
      }
      if (y < (ssize_t) image->rows)
        {
          xpm_colors=DestroySplayTree(xpm_colors);
          xpm_buffer=DestroyString(xpm_buffer);
          ThrowReaderException(CorruptImageError,"NotEnoughPixelData");
        }
    }
  /*
    Relinquish resources.
  */
  xpm_colors=DestroySplayTree(xpm_colors);
  xpm_buffer=DestroyString(xpm_buffer);
  (void) CloseBlob(image);
  return(GetFirstImageInList(image));
}

//.........这里部分代码省略.........
    /*
      Read pixels to virtual canvas image then push to image.
    */
    if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
      if (image->scene >= (image_info->scene+image_info->number_scenes-1))
        break;
    status=SetImageExtent(image,image->columns,image->rows,exception);
    if (status == MagickFalse)
      return(DestroyImageList(image));
    SetImageColorspace(image,GRAYColorspace,exception);
    if (scene == 0)
      {
        length=GetQuantumExtent(canvas_image,quantum_info,quantum_type);
        pixels=(const unsigned char *) ReadBlobStream(image,length,
          GetQuantumPixels(quantum_info),&count);
      }
    for (y=0; y < (ssize_t) image->extract_info.height; y++)
    {
      register const Quantum
        *magick_restrict p;

      register ssize_t
        x;

      register Quantum
        *magick_restrict q;

      if (count != (ssize_t) length)
        {
          ThrowFileException(exception,CorruptImageError,
            "UnexpectedEndOfFile",image->filename);
          break;
        }
      q=GetAuthenticPixels(canvas_image,0,0,canvas_image->columns,1,exception);
      if (q == (Quantum *) NULL)
        break;
      length=ImportQuantumPixels(canvas_image,(CacheView *) NULL,quantum_info,
        quantum_type,pixels,exception);
      if (SyncAuthenticPixels(canvas_image,exception) == MagickFalse)
        break;
      if (((y-image->extract_info.y) >= 0) && 
          ((y-image->extract_info.y) < (ssize_t) image->rows))
        {
          p=GetVirtualPixels(canvas_image,canvas_image->extract_info.x,0,
            image->columns,1,exception);
          q=QueueAuthenticPixels(image,0,y-image->extract_info.y,image->columns,
            1,exception);
          if ((p == (const Quantum *) NULL) ||
              (q == (Quantum *) NULL))
            break;
          for (x=0; x < (ssize_t) image->columns; x++)
          {
            SetPixelGray(image,GetPixelGray(canvas_image,p),q);
            p+=GetPixelChannels(canvas_image);
            q+=GetPixelChannels(image);
          }
          if (SyncAuthenticPixels(image,exception) == MagickFalse)
            break;
        }
      if (image->previous == (Image *) NULL)
        {
          status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
            image->rows);
          if (status == MagickFalse)
            break;
        }
      pixels=(const unsigned char *) ReadBlobStream(image,length,
        GetQuantumPixels(quantum_info),&count);
    }
    SetQuantumImageType(image,quantum_type);
    /*
      Proceed to next image.
    */
    if (image_info->number_scenes != 0)
      if (image->scene >= (image_info->scene+image_info->number_scenes-1))
        break;
    if (count == (ssize_t) length)
      {
        /*
          Allocate next image structure.
        */
        AcquireNextImage(image_info,image,exception);
        if (GetNextImageInList(image) == (Image *) NULL)
          {
            image=DestroyImageList(image);
            return((Image *) NULL);
          }
        image=SyncNextImageInList(image);
        status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
          GetBlobSize(image));
        if (status == MagickFalse)
          break;
      }
    scene++;
  } while (count == (ssize_t) length);
  quantum_info=DestroyQuantumInfo(quantum_info);
  canvas_image=DestroyImage(canvas_image);
  (void) CloseBlob(image);
  return(GetFirstImageInList(image));
}

//.........这里部分代码省略.........
        (jas_image_cmpttly(jp2_image,components[i]) != 0) ||
        (x_step[i] != 1) || (y_step[i] != 1) ||
        (jas_image_cmptsgnd(jp2_image,components[i]) != MagickFalse))
      {
        (void) jas_stream_close(jp2_stream);
        jas_image_destroy(jp2_image);
        ThrowReaderException(CoderError,"IrregularChannelGeometryNotSupported");
      }
  }
  /*
    Convert JPEG 2000 pixels.
  */
  image->matte=number_components > 3 ? MagickTrue : MagickFalse;
  maximum_component_depth=0;
  for (i=0; i < (long) number_components; i++)
  {
    maximum_component_depth=(unsigned int) MagickMax((size_t)
      jas_image_cmptprec(jp2_image,components[i]),(size_t)
      maximum_component_depth);
    pixels[i]=jas_matrix_create(1,(int) (image->columns/x_step[i]));
    if (pixels[i] == (jas_matrix_t *) NULL)
      {
        for (--i; i >= 0; i--)
          jas_matrix_destroy(pixels[i]);
        jas_image_destroy(jp2_image);
        ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
      }
  }
  image->depth=maximum_component_depth;
  if (image_info->ping != MagickFalse)
    {
      (void) jas_stream_close(jp2_stream);
      jas_image_destroy(jp2_image);
      return(GetFirstImageInList(image));
    }
  for (i=0; i < (long) number_components; i++)
  {
    long
      j;

    map[i]=(QuantumAny *) AcquireQuantumMemory(MaxMap+1,sizeof(**map));
    if (map[i] == (QuantumAny *) NULL)
      {
        for (--i; i >= 0; i--)
          map[i]=(QuantumAny *) RelinquishMagickMemory(map[i]);
        for (i=0; i < (long) number_components; i++)
          jas_matrix_destroy(pixels[i]);
        jas_image_destroy(jp2_image);
        ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
      }
    range=GetQuantumRange((unsigned long) jas_image_cmptprec(jp2_image,
      components[i]));
    for (j=0; j <= (long) MaxMap; j++)
      map[i][j]=ScaleQuantumToMap(ScaleAnyToQuantum((QuantumAny) j,range));
  }
  for (y=0; y < (long) image->rows; y++)
  {
    q=GetAuthenticPixels(image,0,y,image->columns,1,exception);
    if (q == (PixelPacket *) NULL)
      break;
    for (i=0; i < (long) number_components; i++)
      (void) jas_image_readcmpt(jp2_image,(short) components[i],0,
        ((unsigned int) y)/y_step[i],((unsigned int) image->columns)/x_step[i],
        1,pixels[i]);
    switch (number_components)
    {

//.........这里部分代码省略.........
      pango_layout_get_pixel_extents(layout,NULL,&extent);
      image->columns=extent.x+extent.width+2*page.x;
    }
  else
    {
      image->columns-=2*page.x;
      pango_layout_set_width(layout,(int) ((PANGO_SCALE*image->columns*
        image->x_resolution+36.0)/72.0+0.5));
    }
  if (image->rows == 0)
    {
      pango_layout_get_pixel_extents(layout,NULL,&extent);
      image->rows=extent.y+extent.height+2*page.y;
    }
  else
    {
      image->rows-=2*page.y;
      pango_layout_set_height(layout,(int) ((PANGO_SCALE*image->rows*
        image->y_resolution+36.0)/72.0+0.5));
    }
  /*
    Render markup.
  */
  stride=(size_t) cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32,
    image->columns);
  pixels=(unsigned char *) AcquireQuantumMemory(image->rows,stride*
    sizeof(*pixels));
  if (pixels == (unsigned char *) NULL)
    {
      draw_info=DestroyDrawInfo(draw_info);
      caption=DestroyString(caption);
      ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
    }
  surface=cairo_image_surface_create_for_data(pixels,CAIRO_FORMAT_ARGB32,
    image->columns,image->rows,stride);
  cairo_image=cairo_create(surface);
  cairo_set_operator(cairo_image,CAIRO_OPERATOR_CLEAR);
  cairo_paint(cairo_image);
  cairo_set_operator(cairo_image,CAIRO_OPERATOR_OVER);
  cairo_translate(cairo_image,page.x,page.y);
  pango_cairo_show_layout(cairo_image,layout);
  cairo_destroy(cairo_image);
  cairo_surface_destroy(surface);
  g_object_unref(layout);
  g_object_unref(fontmap);
  /*
    Convert surface to image.
  */
  (void) SetImageBackgroundColor(image);
  p=pixels;
  for (y=0; y < (ssize_t) image->rows; y++)
  {
    register PixelPacket
      *q;

    register ssize_t
      x;

    q=GetAuthenticPixels(image,0,y,image->columns,1,exception);
    if (q == (PixelPacket *) NULL)
      break;
    for (x=0; x < (ssize_t) image->columns; x++)
    {
      double
        gamma;

      fill_color.blue=ScaleCharToQuantum(*p++);
      fill_color.green=ScaleCharToQuantum(*p++);
      fill_color.red=ScaleCharToQuantum(*p++);
      fill_color.opacity=QuantumRange-ScaleCharToQuantum(*p++);
      /*
        Disassociate alpha.
      */
      gamma=1.0-QuantumScale*fill_color.opacity;
      gamma=MagickEpsilonReciprocal(gamma);
      fill_color.blue*=gamma;
      fill_color.green*=gamma;
      fill_color.red*=gamma;
      MagickCompositeOver(&fill_color,fill_color.opacity,q,(MagickRealType)
        q->opacity,q);
      q++;
    }
    if (SyncAuthenticPixels(image,exception) == MagickFalse)
      break;
    if (image->previous == (Image *) NULL)
      {
        status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
        image->rows);
        if (status == MagickFalse)
          break;
      }
  }
  /*
    Relinquish resources.
  */
  pixels=(unsigned char *) RelinquishMagickMemory(pixels);
  draw_info=DestroyDrawInfo(draw_info);
  caption=DestroyString(caption);
  return(GetFirstImageInList(image));
}

//.........这里部分代码省略.........
    {
      double
        high,
        low;

      /*
        Auto fit text into bounding box.
      */
      for ( ; ; draw_info->pointsize*=2.0)
      {
        text=AcquireString(caption);
        i=FormatMagickCaption(image,draw_info,MagickFalse,&metrics,&text);
        (void) CloneString(&draw_info->text,text);
        text=DestroyString(text);
        (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
          -metrics.bounds.x1,metrics.ascent);
        if (draw_info->gravity == UndefinedGravity)
          (void) CloneString(&draw_info->geometry,geometry);
        status=GetMultilineTypeMetrics(image,draw_info,&metrics);
        (void) status;
        width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
        height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
        if ((image->columns != 0) && (image->rows != 0))
          {
            if ((width >= image->columns) && (height >= image->rows))
              break;
          }
        else
          if (((image->columns != 0) && (width >= image->columns)) ||
              ((image->rows != 0) && (height >= image->rows)))
            break;
      }
      high=draw_info->pointsize;
      for (low=1.0; (high-low) > 1.0; )
      {
        draw_info->pointsize=(low+high)/2.0;
        text=AcquireString(caption);
        i=FormatMagickCaption(image,draw_info,MagickFalse,&metrics,&text);
        (void) CloneString(&draw_info->text,text);
        text=DestroyString(text);
        (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
          -metrics.bounds.x1,metrics.ascent);
        if (draw_info->gravity == UndefinedGravity)
          (void) CloneString(&draw_info->geometry,geometry);
        status=GetMultilineTypeMetrics(image,draw_info,&metrics);
        width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
        height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
        if ((image->columns != 0) && (image->rows != 0))
          {
            if ((width < image->columns) && (height < image->rows))
              low=draw_info->pointsize+1.0;
            else
              high=draw_info->pointsize-1.0;
          }
        else
          if (((image->columns != 0) && (width < image->columns)) ||
              ((image->rows != 0) && (height < image->rows)))
            low=draw_info->pointsize+1.0;
          else
            high=draw_info->pointsize-1.0;
      }
      draw_info->pointsize=(low+high)/2.0-1.0;
    }
  (void) CloneString(&draw_info->text,caption);
  i=FormatMagickCaption(image,draw_info,MagickFalse,&metrics,&caption);
  if (SetImageBackgroundColor(image) == MagickFalse)
    {
      InheritException(exception,&image->exception);
      image=DestroyImageList(image);
      return((Image *) NULL);
    }
  /*
    Draw caption.
  */
  (void) CloneString(&draw_info->text,caption);
  status=GetMultilineTypeMetrics(image,draw_info,&metrics);
  if ((draw_info->gravity != UndefinedGravity) &&
      (draw_info->direction != RightToLeftDirection))
    image->page.x=(ssize_t) (metrics.bounds.x1-draw_info->stroke_width/2.0);
  else
    {
      (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
        -metrics.bounds.x1+draw_info->stroke_width/2.0,metrics.ascent+
        draw_info->stroke_width/2.0);
      if (draw_info->direction == RightToLeftDirection)
        (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
          image->columns-(metrics.bounds.x2+draw_info->stroke_width/2.0),
          metrics.ascent+draw_info->stroke_width/2.0);
      draw_info->geometry=AcquireString(geometry);
    }
  status=AnnotateImage(image,draw_info);
  draw_info=DestroyDrawInfo(draw_info);
  caption=DestroyString(caption);
  if (status == MagickFalse)
    {
      image=DestroyImageList(image);
      return((Image *) NULL);
    }
  return(GetFirstImageInList(image));
}

//.........这里部分代码省略.........
#if 0
        {
        /* NOTE: XCF layers are REVERSED from composite order! */
        signed int  j;
        for (j=number_layers-1; j>=0; j--) {
          /* BOGUS: need to consider layer blending modes!! */

          if ( layer_info[j].visible ) { /* only visible ones, please! */
            CompositeImage(image, layer_info[j].image, OverCompositeOp,
               MagickTrue, layer_info[j].offset_x, layer_info[j].offset_y );
             layer_info[j].image =DestroyImage( layer_info[j].image );

            /*  If we do this, we'll get REAL gray images! */
            if ( image_type == GIMP_GRAY ) {
              QuantizeInfo  qi;
              GetQuantizeInfo(&qi);
              qi.colorspace = GRAYColorspace;
              QuantizeImage( &qi, layer_info[j].image );
            }
          }
        }
      }
#else
      {
        /* NOTE: XCF layers are REVERSED from composite order! */
        signed int  j;

        /* first we copy the last layer on top of the main image */
        (void) CompositeImage(image,CopyCompositeOp,
          layer_info[number_layers-1].image,layer_info[number_layers-1].offset_x,
          layer_info[number_layers-1].offset_y);
        layer_info[number_layers-1].image=DestroyImage(
          layer_info[number_layers-1].image);

        /* now reverse the order of the layers as they are put
           into subimages
        */
      image->next=layer_info[number_layers-2].image;
      layer_info[number_layers-2].image->previous=image;
      for (j=number_layers-2; j>=0; j--)
      {
        if (j > 0)
          layer_info[j].image->next=layer_info[j-1].image;
        if (j < (number_layers-1))
          layer_info[j].image->previous=layer_info[j+1].image;
        layer_info[j].image->page.x = layer_info[j].offset_x;
        layer_info[j].image->page.y = layer_info[j].offset_y;
        layer_info[j].image->page.width = layer_info[j].width;
        layer_info[j].image->page.height = layer_info[j].height;
        }
      }
#endif
    }

    layer_info=(XCFLayerInfo *) RelinquishMagickMemory(layer_info);

#if 0  /* BOGUS: do we need the channels?? */
    while (MagickTrue)
    {
      /* read in the offset of the next channel */
      info->cp += xcf_read_int32 (info->fp, &offset, 1);

      /* if the offset is 0 then we are at the end
      *  of the channel list.
      */
      if (offset == 0)
        break;

      /* save the current position as it is where the
      *  next channel offset is stored.
      */
      saved_pos = info->cp;

      /* seek to the channel offset */
      xcf_seek_pos (info, offset);

      /* read in the layer */
      channel = xcf_load_channel (info, gimage);
      if (channel == 0)
        goto error;

      num_successful_elements++;

      /* add the channel to the image if its not the selection */
      if (channel != gimage->selection_mask)
        gimp_image_add_channel (gimage, channel, -1);

      /* restore the saved position so we'll be ready to
      *  read the next offset.
      */
      xcf_seek_pos (info, saved_pos);
    }
#endif
  }

  (void) CloseBlob(image);
  if (image_type == GIMP_GRAY)
    image->type=GrayscaleType;
  return(GetFirstImageInList(image));
}

static MagickBooleanType ForwardFourier(const FourierInfo *fourier_info,
  Image *image,double *magnitude,double *phase,ExceptionInfo *exception)
{
  CacheView
    *magnitude_view,
    *phase_view;

  double
    *magnitude_source,
    *phase_source;

  Image
    *magnitude_image,
    *phase_image;

  long
    i,
    y;

  MagickBooleanType
    status;

  register IndexPacket
    *indexes;

  register long
    x;

  register PixelPacket
    *q;

  magnitude_image=GetFirstImageInList(image);
  phase_image=GetNextImageInList(image);
  if (phase_image == (Image *) NULL)
    {
      (void) ThrowMagickException(exception,GetMagickModule(),ImageError,
        "ImageSequenceRequired","`%s'",image->filename);
      return(MagickFalse);
    }
  /*
    Create "Fourier Transform" image from constituent arrays.
  */
  magnitude_source=(double *) AcquireQuantumMemory((size_t)
    fourier_info->height,fourier_info->width*sizeof(*magnitude_source));
  if (magnitude_source == (double *) NULL)
    return(MagickFalse);
  (void) ResetMagickMemory(magnitude_source,0,fourier_info->width*
    fourier_info->height*sizeof(*magnitude_source));
  phase_source=(double *) AcquireQuantumMemory((size_t) fourier_info->height,
    fourier_info->width*sizeof(*phase_source));
  if (magnitude_source == (double *) NULL)
    {
      (void) ThrowMagickException(exception,GetMagickModule(),
        ResourceLimitError,"MemoryAllocationFailed","`%s'",image->filename);
      magnitude_source=(double *) RelinquishMagickMemory(magnitude_source);
      return(MagickFalse);
    }
  status=ForwardQuadrantSwap(fourier_info->height,fourier_info->height,
    magnitude,magnitude_source);
  if (status != MagickFalse)
    status=ForwardQuadrantSwap(fourier_info->height,fourier_info->height,phase,
      phase_source);
  CorrectPhaseLHS(fourier_info->height,fourier_info->height,phase_source);
  if (fourier_info->modulus != MagickFalse)
    {
      i=0L;
      for (y=0L; y < (long) fourier_info->height; y++)
        for (x=0L; x < (long) fourier_info->width; x++)
        {
          phase_source[i]/=(2.0*MagickPI);
          phase_source[i]+=0.5;
          i++;
        }
    }
  magnitude_view=AcquireCacheView(magnitude_image);
  phase_view=AcquireCacheView(phase_image);
  i=0L;
  for (y=0L; y < (long) fourier_info->height; y++)
  {
    q=GetCacheViewAuthenticPixels(magnitude_view,0L,y,fourier_info->height,1UL,
      exception);
    if (q == (PixelPacket *) NULL)
      break;
    indexes=GetCacheViewAuthenticIndexQueue(magnitude_view);
    for (x=0L; x < (long) fourier_info->width; x++)
    {
      switch (fourier_info->channel)
      {
        case RedChannel:
        default:
        {
          q->red=ClampToQuantum(QuantumRange*magnitude_source[i]);
          break;
        }
        case GreenChannel:
        {
          q->green=ClampToQuantum(QuantumRange*magnitude_source[i]);
          break;
        }
        case BlueChannel:
//.........这里部分代码省略.........

//.........这里部分代码省略.........
                canvas_image=DestroyImageList(canvas_image);
                image=DestroyImageList(image);
                return((Image *) NULL);
              }
            length=GetQuantumExtent(canvas_image,quantum_info,AlphaQuantum);
            for (i=0; i < (ssize_t) scene; i++)
              for (y=0; y < (ssize_t) image->extract_info.height; y++)
                if (ReadBlob(image,length,pixels) != (ssize_t) length)
                  {
                    ThrowFileException(exception,CorruptImageError,
                      "UnexpectedEndOfFile",image->filename);
                    break;
                  }
            count=ReadBlob(image,length,pixels);
            for (y=0; y < (ssize_t) image->extract_info.height; y++)
            {
              if (count != (ssize_t) length)
                {
                  ThrowFileException(exception,CorruptImageError,
                    "UnexpectedEndOfFile",image->filename);
                  break;
                }
              q=GetAuthenticPixels(canvas_image,0,0,canvas_image->columns,1,
                exception);
              if (q == (PixelPacket *) NULL)
                break;
              length=ImportQuantumPixels(canvas_image,(CacheView *) NULL,
                quantum_info,BlueQuantum,pixels,exception);
              if (SyncAuthenticPixels(canvas_image,exception) == MagickFalse)
                break;
              if (((y-image->extract_info.y) >= 0) && 
                  ((y-image->extract_info.y) < (ssize_t) image->rows))
                {
                  p=GetVirtualPixels(canvas_image,
                    canvas_image->extract_info.x,0,canvas_image->columns,1,
                    exception);
                  q=GetAuthenticPixels(image,0,y-image->extract_info.y,
                    image->columns,1,exception);
                  if ((p == (const PixelPacket *) NULL) ||
                      (q == (PixelPacket *) NULL))
                    break;
                  for (x=0; x < (ssize_t) image->columns; x++)
                  {
                    SetOpacityPixelComponent(q,GetOpacityPixelComponent(p));
                    p++;
                    q++;
                  }
                  if (SyncAuthenticPixels(image,exception) == MagickFalse)
                    break;
               }
              count=ReadBlob(image,length,pixels);
            }
            if (image->previous == (Image *) NULL)
              {
                status=SetImageProgress(image,LoadImageTag,4,5);
                if (status == MagickFalse)
                  break;
              }
          }
        if (image->previous == (Image *) NULL)
          {
            status=SetImageProgress(image,LoadImageTag,5,5);
            if (status == MagickFalse)
              break;
          }
        break;
      }
    }
    SetQuantumImageType(image,quantum_type);
    /*
      Proceed to next image.
    */
    if (image_info->number_scenes != 0)
      if (image->scene >= (image_info->scene+image_info->number_scenes-1))
        break;
    if (count == (ssize_t) length)
      {
        /*
          Allocate next image structure.
        */
        AcquireNextImage(image_info,image);
        if (GetNextImageInList(image) == (Image *) NULL)
          {
            image=DestroyImageList(image);
            return((Image *) NULL);
          }
        image=SyncNextImageInList(image);
        status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
          GetBlobSize(image));
        if (status == MagickFalse)
          break;
      }
    scene++;
  } while (count == (ssize_t) length);
  quantum_info=DestroyQuantumInfo(quantum_info);
  InheritException(&image->exception,&canvas_image->exception);
  canvas_image=DestroyImage(canvas_image);
  (void) CloseBlob(image);
  return(GetFirstImageInList(image));
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   R e a d N U L L I m a g e                                                 %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  ReadNULLImage creates a constant image and initializes it to the
%  X server color as specified by the filename.  It allocates the memory
%  necessary for the new Image structure and returns a pointer to the new
%  image.
%
%  The format of the ReadNULLImage method is:
%
%      Image *ReadNULLImage(const ImageInfo *image_info,
%        ExceptionInfo *exception)
%
%  A description of each parameter follows:
%
%    o image_info: the image info.
%
%    o exception: return any errors or warnings in this structure.
%
*/
static Image *ReadNULLImage(const ImageInfo *image_info,
  ExceptionInfo *exception)
{
  Image
    *image;

  MagickBooleanType
    status;

  MagickPixelPacket
    background;

  register IndexPacket
    *indexes;

  register ssize_t
    x;

  register PixelPacket
    *q;

  ssize_t
    y;

  /*
    Initialize Image structure.
  */
  assert(image_info != (const ImageInfo *) NULL);
  assert(image_info->signature == MagickSignature);
  if (image_info->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
      image_info->filename);
  assert(exception != (ExceptionInfo *) NULL);
  assert(exception->signature == MagickSignature);
  image=AcquireImage(image_info);
  if (image->columns == 0)
    image->columns=1;
  if (image->rows == 0)
    image->rows=1;
  status=SetImageExtent(image,image->columns,image->rows);
  if (status == MagickFalse)
    {
      InheritException(exception,&image->exception);
      return(DestroyImageList(image));
    }
  image->matte=MagickTrue;
  GetMagickPixelPacket(image,&background);
  background.opacity=(MagickRealType) TransparentOpacity;
  if (image->colorspace == CMYKColorspace)
    ConvertRGBToCMYK(&background);
  for (y=0; y < (ssize_t) image->rows; y++)
  {
    q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
    if (q == (PixelPacket *) NULL)
      break;
    indexes=GetAuthenticIndexQueue(image);
    for (x=0; x < (ssize_t) image->columns; x++)
    {
      SetPixelPacket(image,&background,q,indexes);
      q++;
      indexes++;
    }
    if (SyncAuthenticPixels(image,exception) == MagickFalse)
      break;
  }
  return(GetFirstImageInList(image));
}

//.........这里部分代码省略.........
        UnlockSemaphoreInfo(constitute_semaphore);
    }
  if (read_info->temporary != MagickFalse)
    {
      (void) RelinquishUniqueFileResource(read_info->filename);
      read_info->temporary=MagickFalse;
      if (image != (Image *) NULL)
        (void) CopyMagickString(image->filename,filename,MaxTextExtent);
    }
  if (image == (Image *) NULL)
    {
      read_info=DestroyImageInfo(read_info);
      return(image);
    }
  if (exception->severity >= ErrorException)
    (void) LogMagickEvent(ExceptionEvent,GetMagickModule(),
      "Coder (%s) generated an image despite an error (%d), "
      "notify the developers",image->magick,exception->severity);
  if (IsBlobTemporary(image) != MagickFalse)
    (void) RelinquishUniqueFileResource(read_info->filename);
  if ((GetNextImageInList(image) != (Image *) NULL) &&
      (IsSceneGeometry(read_info->scenes,MagickFalse) != MagickFalse))
    {
      Image
        *clones;

      clones=CloneImages(image,read_info->scenes,exception);
      if (clones == (Image *) NULL)
        (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
          "SubimageSpecificationReturnsNoImages","`%s'",read_info->filename);
      else
        {
          image=DestroyImageList(image);
          image=GetFirstImageInList(clones);
        }
    }
  if (GetBlobError(image) != MagickFalse)
    {
      ThrowFileException(exception,FileOpenError,
        "AnErrorHasOccurredReadingFromFile",read_info->filename);
      image=DestroyImageList(image);
      read_info=DestroyImageInfo(read_info);
      return((Image *) NULL);
    }
  for (next=image; next != (Image *) NULL; next=GetNextImageInList(next))
  {
    char
      *property,
      timestamp[MaxTextExtent];

    const char
      *option;

    const StringInfo
      *profile;

    next->taint=MagickFalse;
    if (next->magick_columns == 0)
      next->magick_columns=next->columns;
    if (next->magick_rows == 0)
      next->magick_rows=next->rows;
    if ((LocaleCompare(magick,"HTTP") != 0) &&
        (LocaleCompare(magick,"FTP") != 0))
      (void) CopyMagickString(next->magick,magick,MaxTextExtent);
    (void) CopyMagickString(next->magick_filename,magick_filename,
      MaxTextExtent);

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   W r i t e I m a g e s                                                     %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  WriteImages() writes an image sequence.
%
%  The format of the WriteImages method is:
%
%      MagickBooleanType WriteImages(const ImageInfo *image_info,Image *images,
%        const char *filename,ExceptionInfo *exception)
%
%  A description of each parameter follows:
%
%    o image_info: the image info.
%
%    o images: the image list.
%
%    o filename: the image filename.
%
%    o exception: return any errors or warnings in this structure.
%
*/
MagickExport MagickBooleanType WriteImages(const ImageInfo *image_info,
  Image *images,const char *filename,ExceptionInfo *exception)
{
#define WriteImageTag  "Write/Image"

  BlobInfo
    *blob;

  ExceptionInfo
    *sans_exception;

  ImageInfo
    *write_info;

  MagickBooleanType
    proceed;

  MagickOffsetType
    i;

  MagickProgressMonitor
    progress_monitor;

  MagickSizeType
    number_images;

  MagickStatusType
    status;

  register Image
    *p;

  assert(image_info != (const ImageInfo *) NULL);
  assert(image_info->signature == MagickSignature);
  assert(images != (Image *) NULL);
  assert(images->signature == MagickSignature);
  if (images->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",images->filename);
  assert(exception != (ExceptionInfo *) NULL);
  write_info=CloneImageInfo(image_info);
  images=GetFirstImageInList(images);
  blob=CloneBlobInfo(images->blob);  /* thread specific I/O handler */
  DestroyBlob(images);
  images->blob=blob;
  if (filename != (const char *) NULL)
    for (p=images; p != (Image *) NULL; p=GetNextImageInList(p))
      (void) CopyMagickString(p->filename,filename,MaxTextExtent);
  (void) CopyMagickString(write_info->filename,images->filename,MaxTextExtent);
  if (*write_info->magick == '\0')
    (void) CopyMagickString(write_info->magick,images->magick,MaxTextExtent);
  sans_exception=AcquireExceptionInfo();
  (void) SetImageInfo(write_info,(unsigned int) GetImageListLength(images),
    sans_exception);
  sans_exception=DestroyExceptionInfo(sans_exception);
  p=images;
  for ( ; GetNextImageInList(p) != (Image *) NULL; p=GetNextImageInList(p))
    if (p->scene >= GetNextImageInList(p)->scene)
      {
        register ssize_t
          i;

        /*
          Generate consistent scene numbers.
        */
        i=(ssize_t) images->scene;
        for (p=images; p != (Image *) NULL; p=GetNextImageInList(p))
          p->scene=(size_t) i++;
        break;
      }
  /*
    Write images.
//.........这里部分代码省略.........

MagickExport Image *ChannelFxImage(const Image *image,const char *expression,
                                   ExceptionInfo *exception)
{
#define ChannelFxImageTag  "ChannelFx/Image"

    ChannelFx
    channel_op;

    ChannelType
    channel_mask;

    char
    token[MagickPathExtent];

    const char
    *p;

    const Image
    *source_image;

    double
    pixel;

    Image
    *destination_image;

    MagickBooleanType
    status;

    PixelChannel
    source_channel,
    destination_channel;

    ssize_t
    channels;

    assert(image != (Image *) NULL);
    assert(image->signature == MagickCoreSignature);
    if (image->debug != MagickFalse)
        (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
    assert(exception != (ExceptionInfo *) NULL);
    assert(exception->signature == MagickCoreSignature);
    source_image=image;
    destination_image=CloneImage(source_image,0,0,MagickTrue,exception);
    if (destination_image == (Image *) NULL)
        return((Image *) NULL);
    if (expression == (const char *) NULL)
        return(destination_image);
    destination_channel=RedPixelChannel;
    channel_mask=UndefinedChannel;
    pixel=0.0;
    p=(char *) expression;
    GetMagickToken(p,&p,token);
    channel_op=ExtractChannelOp;
    for (channels=0; *token != '\0'; )
    {
        ssize_t
        i;

        /*
          Interpret channel expression.
        */
        switch (*token)
        {
        case ',':
        {
            GetMagickToken(p,&p,token);
            break;
        }
        case '|':
        {
            if (GetNextImageInList(source_image) != (Image *) NULL)
                source_image=GetNextImageInList(source_image);
            else
                source_image=GetFirstImageInList(source_image);
            GetMagickToken(p,&p,token);
            break;
        }
        case ';':
        {
            Image
            *canvas;

            (void) SetPixelChannelMask(destination_image,channel_mask);
            if ((channel_op == ExtractChannelOp) && (channels == 1))
                (void) SetImageColorspace(destination_image,GRAYColorspace,exception);
            status=SetImageStorageClass(destination_image,DirectClass,exception);
            if (status == MagickFalse)
            {
                destination_image=DestroyImageList(destination_image);
                return(destination_image);
            }
            canvas=CloneImage(source_image,0,0,MagickTrue,exception);
            if (canvas == (Image *) NULL)
            {
                destination_image=DestroyImageList(destination_image);
                return(destination_image);
            }
            AppendImageToList(&destination_image,canvas);
            destination_image=GetLastImageInList(destination_image);
//.........这里部分代码省略.........