/*

% Copyright (C) 2003-2025 GraphicsMagick Group

% Copyright (C) 2003 ImageMagick Studio

% Copyright 1991-1999 E. I. du Pont de Nemours and Company

%

% This program is covered by multiple licenses, which are described in

% Copyright.txt. You should have received a copy of Copyright.txt with this

% package; otherwise see http://www.graphicsmagick.org/www/Copyright.html.

%

% GraphicsMagick Image Analysis Methods

%

*/

/*

  Include declarations.

*/

#include "magick/studio.h"

#include "magick/analyze.h"

#include "magick/color.h"

#include "magick/log.h"

#include "magick/monitor.h"

#include "magick/pixel_cache.h"

#include "magick/pixel_iterator.h"

#include "magick/utility.h"

/*

  Constant declaration.

*/

/*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%                                                                             %

%                                                                             %

%                                                                             %

+   G e t I m a g e B o u n d i n g B o x                                     %

%                                                                             %

%                                                                             %

%                                                                             %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

%  Method GetImageBoundingBox returns the bounding box of an image canvas.

%  If the image has an opacity channel then return a bounding box based

%  only on the opacity channel, otherwise return the bounding box of the

%  image based on the current image fuzz setting.

%

%  The format of the GetImageBoundingBox method is:

%

%      RectangleInfo GetImageBoundingBox(const Image *image,

%        ExceptionInfo *exception)

%

%  A description of each parameter follows:

%

%    o bounds: Method GetImageBoundingBox returns the bounding box of an

%      image canvas.

%

%    o image: The image.

%

%    o exception: Return any errors or warnings in this structure.

%

%

*/

#define GetImageBoundingBoxText "[%s] Get bounding box..."

MagickExport RectangleInfo GetImageBoundingBox(const Image *image,

                                               ExceptionInfo *exception)

{

  MagickPassFail

    status=MagickPass;

  long

    y;

  unsigned long

    row_count=0;

  MagickBool

    monitor_active;

  PixelPacket

    corners[3];

  RectangleInfo

    bounds;

  assert(image != (Image *) NULL);

  assert(image->signature == MagickSignature);

  monitor_active=MagickMonitorActive();

  bounds.width=0;

  bounds.height=0;

  bounds.x=(long) image->columns;

  bounds.y=(long) image->rows;

  if ((image->columns == 0) || (image->rows == 0))

    return(bounds);

  (void) AcquireOnePixelByReference(image,&corners[0],0,0,exception);

  (void) AcquireOnePixelByReference(image,&corners[1],(long) image->columns-1,0,exception);

  (void) AcquireOnePixelByReference(image,&corners[2],0,(long) image->rows-1,exception);

#if defined(HAVE_OPENMP)

#  pragma omp parallel for schedule(static,4) shared(bounds, row_count, status)

#endif

  for (y=0; y < (long) image->rows; y++)

    {

      register const PixelPacket

        * restrict p;

      register long

        x;

      RectangleInfo

        thread_bounds;

      MagickPassFail

        thread_status;

#if defined(HAVE_OPENMP)

#  pragma omp critical (GM_GetImageBoundingBox)

#endif

      {

        thread_status=status;

        thread_bounds=bounds;

      }

      if (thread_status == MagickFail)

        continue;

      p=AcquireImagePixels(image,0,y,image->columns,1,exception);

      if (p == (const PixelPacket *) NULL)

        thread_status=MagickFail;

      if (thread_status != MagickFail)

        {

          if ((image->matte) &&

              (corners[0].opacity != OpaqueOpacity) &&

              (corners[0].opacity == corners[1].opacity) &&

              (corners[1].opacity == corners[2].opacity))

            /*

              Consider only the opacity channel. Not currently fuzzy

              so only applied for simple transparency.

            */

            for (x=0; x < (long) image->columns; x++)

              {

                if (p->opacity != corners[0].opacity)

                  if (x < thread_bounds.x)

                    thread_bounds.x=x;

                if (p->opacity != corners[1].opacity)

                  if (x > (long) thread_bounds.width)

                    thread_bounds.width=x;

                if (p->opacity != corners[0].opacity)

                  if (y < thread_bounds.y)

                    thread_bounds.y=y;

                if (p->opacity != corners[2].opacity)

                  if (y > (long) thread_bounds.height)

                    thread_bounds.height=y;

                p++;

              }

          else if (image->fuzz <= MagickEpsilon)

            {

              /*

                Consider only the RGB channels using absolute comparison

              */

              for (x=0; x < (long) image->columns; x++)

                {

                  if (!ColorMatch(p,&corners[0]))

                    if (x < thread_bounds.x)

                      thread_bounds.x=x;

                  if (!ColorMatch(p,&corners[1]))

                    if (x > (long) thread_bounds.width)

                      thread_bounds.width=x;

                  if (!ColorMatch(p,&corners[0]))

                    if (y < thread_bounds.y)

                      thread_bounds.y=y;

                  if (!ColorMatch(p,&corners[2]))

                    if (y > (long) thread_bounds.height)

                      thread_bounds.height=y;

                  p++;

                }

            }

          else

            /*

              Consider only the RGB channels using fuzzy comparison

            */

            for (x=0; x < (long) image->columns; x++)

              {

                if (!FuzzyColorMatch(p,&corners[0],image->fuzz))

                  if (x < thread_bounds.x)

                    thread_bounds.x=x;

                if (!FuzzyColorMatch(p,&corners[1],image->fuzz))

                  if (x > (long) thread_bounds.width)

                    thread_bounds.width=x;

                if (!FuzzyColorMatch(p,&corners[0],image->fuzz))

                  if (y < thread_bounds.y)

                    thread_bounds.y=y;

                if (!FuzzyColorMatch(p,&corners[2],image->fuzz))

                  if (y > (long) thread_bounds.height)

                    thread_bounds.height=y;

                p++;

              }

        }

      if (monitor_active)

        {

          unsigned long

            thread_row_count;

#if defined(HAVE_OPENMP)

#  pragma omp atomic

#endif

          row_count++;

#if defined(HAVE_OPENMP)

#  pragma omp flush (row_count)

#endif

          thread_row_count=row_count;

          if (QuantumTick(thread_row_count,image->rows))

            if (!MagickMonitorFormatted(thread_row_count,image->rows,exception,

                                        GetImageBoundingBoxText,image->filename))

              thread_status=MagickFail;

        }

#if defined(HAVE_OPENMP)

#  pragma omp critical (GM_GetImageBoundingBox)

#endif

      {

        if (thread_bounds.x < bounds.x)

          bounds.x=thread_bounds.x;

        if (thread_bounds.y < bounds.y)

          bounds.y=thread_bounds.y;

        if (thread_bounds.width > bounds.width)

          bounds.width=thread_bounds.width;

        if (thread_bounds.height > bounds.height)

          bounds.height=thread_bounds.height;

      }

      if (thread_status == MagickFail)

        {

          status=MagickFail;

#if defined(HAVE_OPENMP)

#  pragma omp flush (status)

#endif

        }

    }

  if (bounds.width != 0)

    bounds.width-=(bounds.x-1);

  if (bounds.height != 0)

    bounds.height-=(bounds.y-1);

  if (bounds.x < 0)

    bounds.x=0;

  if (bounds.y < 0)

    bounds.y=0;

  /*

    If we fail to find smaller bounds, then return original image

    dimensions.

  */

  if ((bounds.width == 0) || (bounds.height == 0))

    {

      bounds.width=image->columns;

      bounds.height=image->rows;

      bounds.x=0;

      bounds.y=0;

    }

  if (IsEventLogged(TransformEvent))

    (void) LogMagickEvent(TransformEvent,GetMagickModule(),

                          "Bounding Box: %lux%lu%+ld%+ld",

                          bounds.width, bounds.height, bounds.x, bounds.y);

  return(bounds);

}

/*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%                                                                             %

%                                                                             %

%                                                                             %

%   G e t I m a g e D e p t h                                                 %

%                                                                             %

%                                                                             %

%                                                                             %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

%  GetImageDepth() returns the minimum bit depth of the image required to

%  ensure that data is not lost in the red, green, blue, and opacity, channels.

%  Pixel components are stored in a Quantum, which is 8, 16, or 32 bits

%  depending on the QuantumDepth value set when the software is compiled.

%  GetImageDepth() returns the smallest modulus storage size which supports

%  the scale of the pixel within the range (i.e. no information is lost).

%  As an example, the value one is returned for a black and white image

%  since only one bit of resolution is required to represent a black and white

%  image.

%

%  The format of the GetImageDepth method is:

%

%      unsigned long GetImageDepth(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.

%

%

*/

#if MaxMap == MaxRGB

static inline unsigned char MinimumDepthForValue(const Quantum quantum)

{

  register unsigned int

    depth,

    scale;

  for (depth=1 ; depth <= (unsigned int) QuantumDepth; depth++)

    {

      scale=MaxRGB / (MaxRGB >> (QuantumDepth-depth));

      if (quantum == scale*(quantum/scale))

        break;

    }

  return (unsigned char) depth;

}

static magick_uint8_t* AllocateDepthMap(void)

{

  magick_uint8_t

    *map;

  map = MagickAllocateResourceLimitedArray(unsigned char *, MaxMap+1, sizeof(magick_uint8_t));

  if (map != (unsigned char *) NULL)

    {

      unsigned int

        i;

      for (i=0; i <= MaxMap; i++)

        map[i] = (magick_uint8_t) MinimumDepthForValue(i);

    }

  return map;

}

#endif /* MaxMap == MaxRGB */

#define GetImageDepthText "[%s] Get depth..."

static MagickPassFail

GetImageDepthCallBack(void *mutable_data,          /* User provided mutable data */

                      const void *immutable_data,  /* User provided immutable data */

                      const Image * restrict image,          /* Input image */

                      const PixelPacket * restrict pixels,   /* Pixel row */

                      const IndexPacket * restrict indexes,  /* Pixel indexes */

                      const long npixels,          /* Number of pixels in row */

                      ExceptionInfo * restrict exception     /* Exception report */

                      )

{

  unsigned int

    *current_depth=(unsigned int *) mutable_data;

  magick_uint8_t

    *map = (magick_uint8_t *) immutable_data;

  register unsigned int

    depth;

  register long

    i;

  ARG_NOT_USED(indexes);

  ARG_NOT_USED(exception);

#if defined(HAVE_OPENMP)

#  pragma omp critical (GM_GetImageDepthCallBack)

#endif

  {

    depth=*current_depth;

  }

#if MaxMap == MaxRGB

  if (map)

    {

      /*

        Use fast table lookups if we can

      */

      for (i=0; i < npixels; i++)

        {

          depth=Max(depth,map[pixels[i].red]);

          depth=Max(depth,map[pixels[i].green]);

          depth=Max(depth,map[pixels[i].blue]);

          if (image->matte)

            depth=Max(depth,map[pixels[i].opacity]);

          if (depth == QuantumDepth)

            break;

        }

    }

#else

    {

      /*

        Use the slow, sure, way (Q32 only)

      */

      register unsigned int

        scale;

      ARG_NOT_USED(map);

      scale=MaxRGB / (MaxRGB >> (QuantumDepth-depth));

      i=0;

      while (i < npixels)

        {

          if ((pixels[i].red != scale*(pixels[i].red/scale)) ||

              (pixels[i].green != scale*(pixels[i].green/scale)) ||

              (pixels[i].blue != scale*(pixels[i].blue/scale)) ||

              (image->matte &&

               (pixels[i].opacity != scale*((pixels[i].opacity/scale)))))

            {

              depth++;

              if (depth == QuantumDepth)

                break;

              scale=MaxRGB / (MaxRGB >> (QuantumDepth-depth));

              continue;

            }

          i++;

        }

    }

#endif

#if defined(HAVE_OPENMP)

#  pragma omp critical (GM_GetImageDepthCallBack)

#endif

  {

    if (depth > *current_depth)

      *current_depth=depth;

  }

  return (depth >= QuantumDepth ? MagickFail : MagickPass);

}

MagickExport unsigned long GetImageDepth(const Image *image,

                                         ExceptionInfo *exception)

{

  magick_uint8_t

    *map = (magick_uint8_t *) NULL;

  unsigned int

    depth=1;

  assert(image != (Image *) NULL);

  assert(image->signature == MagickSignature);

  if (image->is_monochrome)

    return depth;

#if MaxMap == MaxRGB

  /*

    Use fast table lookups if we can

  */

  map = AllocateDepthMap();

#endif

  if ((image->storage_class == PseudoClass) && !(image->matte))

    {

      /*

        PseudoClass

      */

      (void) GetImageDepthCallBack(&depth,map,image,

                                   image->colormap,

                                   (IndexPacket *) NULL,

                                   image->colors,

                                   exception);

    }

  else

    {

      /*

        DirectClass.

        Notice that all pixels in the image must be inspected if the

        image depth is less than QuantumDepth.

      */

      (void) PixelIterateMonoRead(GetImageDepthCallBack,

                                  NULL,

                                  GetImageDepthText,

                                  &depth,map,0,0,image->columns,

                                  image->rows,image,exception);

    }

  MagickFreeResourceLimitedMemory(magick_uint8_t *,map);

  return depth;

}

/*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%                                                                             %

%                                                                             %

%                                                                             %

%   G e t I m a g e C h a r a c t e r i s t i c s                             %

%                                                                             %

%                                                                             %

%                                                                             %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

%  GetImageCharacteristics obtains the basic characteristics of the image

%  and stores the characterisistics in the user provided

%  ImageCharacteristics structure.  If optimize is set to MagickTrue, then

%  exhaustive testing of the image pixels is performed (as required).

%  MagickPass is returned if this method executes without error.

%

%  The format of the GetImageCharacteristics method is:

%

%      MagickPassFail GetImageCharacteristics(const Image *image,

%                               ImageCharacteristics *characteristics,

%                               MagickBool optimize,

%                               ExceptionInfo *exception)

%

%  A description of each parameter follows:

%

%    o image: The image.

%

%    o characteristics: An ImageCharacteristics structure to update.

%

%    o optimize: Inspect image pixels (if required)

%

%    o exception: Any errors are reported here.

%

*/

#define AnalyzeImageText "[%s] Analyze...  "

MagickExport MagickPassFail GetImageCharacteristics(const Image *image,

                                                    ImageCharacteristics *characteristics,

                                                    const MagickBool optimize,

                                                    ExceptionInfo *exception)

{

  unsigned long

    y;

  register const PixelPacket

    *p;

  register unsigned long

    x;

  MagickBool

    broke_loop = MagickFalse;

  MagickPassFail

    status = MagickPass;

  assert(image != (Image *) NULL);

  assert(image->signature == MagickSignature);

  assert(characteristics != (ImageCharacteristics *) NULL);

  assert(exception != (ExceptionInfo *) NULL);

  characteristics->cmyk = (image->colorspace == CMYKColorspace ? MagickTrue : MagickFalse);

  characteristics->grayscale = (image->is_grayscale ? MagickTrue : MagickFalse);

  characteristics->monochrome = (image->is_monochrome ? MagickTrue : MagickFalse);

  characteristics->opaque = (image->matte ? MagickFalse : MagickTrue);

  characteristics->palette = (image->storage_class == PseudoClass ? MagickTrue : MagickFalse);

  if ((optimize) && (GetPixelCachePresent(image)))

    {

      MagickBool

        grayscale,

        monochrome,

        opaque;

      /* Predicate to test */

      grayscale=(image->is_grayscale ? MagickFalse : MagickTrue);

      monochrome=(image->is_monochrome ? MagickFalse : MagickTrue);

      opaque=(image->matte ? MagickTrue : MagickFalse);

      switch (image->storage_class)

        {

        case DirectClass:

        case UndefinedClass:

          {

            for (y=0; y < image->rows; y++)

              {

                p=AcquireImagePixels(image,0,y,image->columns,1,exception);

                if (p == (const PixelPacket *) NULL)

                  {

                    status = MagickFail;

                    break;

                  }

                for (x=image->columns; x != 0; x--)

                  {

                    grayscale = ((grayscale) &&

                                 (p->red == p->green) && (p->red == p->blue));

                    monochrome = ((monochrome) && (grayscale) &&

                                  ((0 == p->red) || (MaxRGB == p->red)));

                    opaque = ((opaque) &&

                              (p->opacity == OpaqueOpacity));

                    if (!grayscale &&

                        !monochrome &&

                        !opaque)

                      {

                        broke_loop=MagickTrue;

                        break;

                      }

                    p++;

                  }

                if (!grayscale &&

                    !monochrome &&

                    !opaque)

                  break;

                if (QuantumTick(y,image->rows))

                  if (!MagickMonitorFormatted(y,image->rows,exception,

                                              AnalyzeImageText,image->filename))

                    break;

              }

            break;

          }

        case PseudoClass:

          {

            p=image->colormap;

            for (x=image->colors; x != 0; x--)

              {

                grayscale = ((grayscale) &&

                             (p->red == p->green) && (p->red == p->blue));

                monochrome = ((monochrome) && (grayscale) &&

                              ((0 == p->red) || (MaxRGB == p->red)));

                if (!grayscale &&

                    !monochrome)

                  {

                    broke_loop=MagickTrue;

                    break;

                  }

                p++;

              }

            if (opaque)

              {

                for (y=0; y < image->rows; y++)

                  {

                    p=AcquireImagePixels(image,0,y,image->columns,1,exception);

                    if (p == (const PixelPacket *) NULL)

                      {

                        status = MagickFail;

                        break;

                      }

                    for (x=image->columns; x != 0; x--)

                      {

                        opaque = ((opaque) &&

                                  (p->opacity == OpaqueOpacity));

                        if (!opaque)

                          {

                            broke_loop=MagickTrue;

                            break;

                          }

                        p++;

                      }

                    if (!opaque)

                      break;

                    if (QuantumTick(y,image->rows))

                      if (!MagickMonitorFormatted(y,image->rows,exception,

                                                  AnalyzeImageText,image->filename))

                        break;

                  }

              }

            break;

          }

        }

      if (!characteristics->grayscale)

        {

          characteristics->grayscale=grayscale;

          ((Image *)image)->is_grayscale=grayscale; /* Intentionally ignore const */

        }

      if (!characteristics->monochrome)

        {

          characteristics->monochrome=monochrome;

          ((Image *)image)->is_monochrome=monochrome; /* Intentionally ignore const */

        }

      if (!characteristics->opaque)

        characteristics->opaque=opaque;

    }

  /*

    Force progress indication to 100%

  */

  if (broke_loop)

    (void) MagickMonitorFormatted(image->rows-1,image->rows,exception,

                                  AnalyzeImageText,image->filename);

/*   printf("status=%s, cmyk=%u, grayscale=%u, monochrome=%u, opaque=%u, palette=%u\n", */

/*          (status == MagickFail ? "Fail" : "Pass"),characteristics->cmyk,characteristics->grayscale, */

/*          characteristics->monochrome,characteristics->opaque,characteristics->palette); */

  return status;

}

/*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%                                                                             %

%                                                                             %

%                                                                             %

%   G e t I m a g e T y p e                                                   %

%                                                                             %

%                                                                             %

%                                                                             %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

%  GetImageType() returns the type of image:

%

%        Bilevel        Grayscale       GrayscaleMatte

%        Palette        PaletteMatte    TrueColor

%        TrueColorMatte ColorSeparation ColorSeparationMatte

%

%

%  The format of the GetImageType method is:

%

%      ImageType GetImageType(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 ImageType

GetImageType(const Image *image,ExceptionInfo *exception)

{

  ImageCharacteristics

    characteristics;

  ImageType

    image_type;

  assert(image != (Image *) NULL);

  assert(image->signature == MagickSignature);

  image_type=UndefinedType;

  if (GetImageCharacteristics(image,&characteristics,MagickTrue,exception))

    {

      if (characteristics.cmyk)

        image_type=(characteristics.opaque ? ColorSeparationType : ColorSeparationMatteType);

      else if (characteristics.monochrome)

        image_type=BilevelType;

      else if (characteristics.grayscale)

        image_type=(characteristics.opaque ? GrayscaleType : GrayscaleMatteType);

      else if (characteristics.palette)

        image_type=(characteristics.opaque ? PaletteType : PaletteMatteType);

      else

        image_type=(characteristics.opaque ? TrueColorType : TrueColorMatteType);

    }

  return image_type;

}

/*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%                                                                             %

%                                                                             %

%                                                                             %

%     I s G r a y I m a g e                                                   %

%                                                                             %

%                                                                             %

%                                                                             %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

%  IsGrayImage() returns MagickTrue if all the pixels in the image have the same

%  red, green, and blue intensities.

%

%  The format of the IsGrayImage method is:

%

%      MagickBool IsGrayImage(const Image *image,ExceptionInfo *exception)

%

%  A description of each parameter follows:

%

%    o status: Method IsGrayImage returns MagickTrue if the image is grayscale

%      otherwise MagickFalse is returned.

%

%    o image: The image.

%

%    o exception: Return any errors or warnings in this structure.

%

%

*/

#define AnalyzeGrayImageText "[%s] Analyze for gray..."

MagickExport MagickBool IsGrayImage(const Image *image,

  ExceptionInfo *exception)

{

  unsigned long

    y;

  register const PixelPacket

    *p;

  register unsigned long

    x;

  MagickBool

    is_grayscale;

  assert(image != (Image *) NULL);

  assert(image->signature == MagickSignature);

  assert(exception != (ExceptionInfo *) NULL);

  if (image->colorspace == CMYKColorspace)

    return(MagickFalse);

  if (image->is_grayscale)

    return(MagickTrue);

  is_grayscale=MagickTrue;

  switch (image->storage_class)

  {

    case DirectClass:

    case UndefinedClass:

    {

      (void) LogMagickEvent(TransformEvent,GetMagickModule(),

                            "IsGrayImage(): Exhaustive pixel test!");

      for (y=0; y < image->rows; y++)

      {

        p=AcquireImagePixels(image,0,y,image->columns,1,exception);

        if (p == (const PixelPacket *) NULL)

          return(MagickFalse);

        for (x=image->columns; x != 0; x--)

        {

          if ((p->red != p->green) || (p->green != p->blue))

            {

              is_grayscale=MagickFalse;

              break;

            }

          p++;

        }

        if (!is_grayscale)

          break;

        if (QuantumTick(y,image->rows))

          if (!MagickMonitorFormatted(y,image->rows,

                                      exception,AnalyzeGrayImageText,

                                      image->filename))

            break;

      }

      break;

    }

    case PseudoClass:

    {

      p=image->colormap;

      for (x=image->colors; x != 0; x--)

        {

          if ((p->red != p->green) || (p->green != p->blue))

            {

              is_grayscale=MagickFalse;

              break;

            }

          p++;

        }

      break;

    }

  }

  /*

    Force progress indication to 100%

  */

  if (!is_grayscale)

    (void) MagickMonitorFormatted(image->rows-1,image->rows,exception,

                                  AnalyzeGrayImageText,image->filename);

  ((Image *)image)->is_grayscale=is_grayscale;

  return(is_grayscale);

}

/*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%                                                                             %

%                                                                             %

%                                                                             %

%   I s M o n o c h r o m e I m a g e                                         %

%                                                                             %

%                                                                             %

%                                                                             %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

%  IsMonochromeImage() returns MagickTrue if all the pixels in the image have

%  the same red, green, and blue intensities and the intensity is either

%  0 or MaxRGB.

%

%  The format of the IsMonochromeImage method is:

%

%      MagickBool IsMonochromeImage(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.

%

%

*/

#define AnalyzeBilevelImageText "[%s] Analyze for bilevel..."

MagickExport MagickBool IsMonochromeImage(const Image *image,

  ExceptionInfo *exception)

{

  unsigned long

    y;

  register const PixelPacket

    *p;

  register unsigned long

    x;

  MagickBool

    is_monochrome;

  assert(image != (Image *) NULL);

  assert(image->signature == MagickSignature);

  assert(exception != (ExceptionInfo *) NULL);

  if (image->colorspace == CMYKColorspace)

    return(MagickFalse);

  if (image->is_monochrome)

    return(MagickTrue);

  is_monochrome=MagickTrue;

  switch (image->storage_class)

  {

    case DirectClass:

    case UndefinedClass:

    {

      (void) LogMagickEvent(TransformEvent,GetMagickModule(),

                            "IsMonochromeImage(): Exhaustive pixel test!");

      for (y=0; y < image->rows; y++)

      {

        p=AcquireImagePixels(image,0,y,image->columns,1,exception);

        if (p == (const PixelPacket *) NULL)

          return(MagickFalse);

        for (x=image->columns; x != 0; x--)

        {

          if ((p->red != p->green) || (p->green != p->blue) ||

              ((p->red != 0) && (p->red != MaxRGB)))

            {

              is_monochrome=MagickFalse;

              break;

            }

          p++;

        }

        if (!is_monochrome)

          break;

        if (QuantumTick(y,image->rows))

          if (!MagickMonitorFormatted(y,image->rows,exception,

                                      AnalyzeBilevelImageText,image->filename))

            break;

      }

      break;

    }

    case PseudoClass:

    {

      p=image->colormap;

      for (x=image->colors; x != 0; x--)

      {

        if ((p->red != p->green) || (p->green != p->blue) ||

            ((p->red != 0) && (p->red != MaxRGB)))

          {

            is_monochrome=MagickFalse;

            break;

          }

        p++;

      }

      break;

    }

  }

  /*

    Force progress indication to 100%

  */

  if (!is_monochrome)

    (void) MagickMonitorFormatted(image->rows-1,image->rows,exception,

                                  AnalyzeBilevelImageText,image->filename);

  ((Image *)image)->is_monochrome=is_monochrome;

  return(is_monochrome);

}

/*

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