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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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/*
  Copyright 1999 ImageMagick Studio LLC, a non-profit organization
  dedicated to making software imaging solutions freely available.

  You may not use this file except in compliance with the License.  You may
  obtain a copy of the License at

    https://imagemagick.org/script/license.php

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

  MagickCore pixel accessor methods.
*/
#ifndef MAGICKCORE_PIXEL_ACCESSOR_H
#define MAGICKCORE_PIXEL_ACCESSOR_H

#include <math.h>
#include "magick/gem.h"
#include "magick/pixel.h"

#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif

#define ClampPixelRed(pixel) ClampToQuantum((pixel)->red)
#define ClampPixelGreen(pixel) ClampToQuantum((pixel)->green)
#define ClampPixelBlue(pixel) ClampToQuantum((pixel)->blue)
#define ClampPixelIndex(indexes) ClampToQuantum(*(indexes))
#define ClampPixelOpacity(pixel) ClampToQuantum((pixel)->opacity)
#define GetPixela(pixel) ((pixel)->green)
#define GetPixelb(pixel) ((pixel)->blue)
#define GetPixelAlpha(pixel) ((double) QuantumRange-(double) (pixel)->opacity)
#define GetPixelBlack(indexes) (*(indexes))
#define GetPixelBlue(pixel) ((pixel)->blue)
#define GetPixelCb(pixel) ((pixel)->green)
#define GetPixelCr(pixel) ((pixel)->blue)
#define GetPixelCyan(pixel) ((pixel)->red)
#define GetPixelGray(pixel) ((pixel)->red)
#define GetPixelGreen(pixel) ((pixel)->green)
#define GetPixelIndex(indexes)  (*(indexes))
#define GetPixelL(pixel) ((pixel)->red)
#define GetPixelLabel(pixel) ((ssize_t) (pixel)->red)
#define GetPixelMagenta(pixel) ((pixel)->green)
#define GetPixelNext(pixel)  ((pixel)+1)
#define GetPixelOpacity(pixel) ((pixel)->opacity)
#define GetPixelRed(pixel) ((pixel)->red)
#define GetPixelRGB(pixel,packet) \
{ \
  (packet)->red=GetPixelRed((pixel)); \
  (packet)->green=GetPixelGreen((pixel)); \
  (packet)->blue=GetPixelBlue((pixel)); \
}
#define GetPixelRGBO(pixel,packet) \
{ \
  (packet)->red=GetPixelRed((pixel)); \
  (packet)->green=GetPixelGreen((pixel)); \
  (packet)->blue=GetPixelBlue((pixel)); \
  (packet)->opacity=GetPixelOpacity((pixel)); \
}
#define GetPixelY(pixel) ((pixel)->red)
#define GetPixelYellow(pixel) ((pixel)->blue)
#define SetPixela(pixel,value) ((pixel)->green=(Quantum) (value))
#define SetPixelAlpha(pixel,value) \
  ((pixel)->opacity=(Quantum) ((double) QuantumRange-(double) (value)))
#define SetPixelb(pixel,value) ((pixel)->blue=(Quantum) (value))
#define SetPixelBlack(indexes,value) (*(indexes)=(Quantum) (value))
#define SetPixelBlue(pixel,value) ((pixel)->blue=(Quantum) (value))
#define SetPixelCb(pixel,value) ((pixel)->green=(Quantum) (value))
#define SetPixelCr(pixel,value) ((pixel)->blue=(Quantum) (value))
#define SetPixelCyan(pixel,value) ((pixel)->red=(Quantum) (value))
#define SetPixelGray(pixel,value) \
  ((pixel)->red=(pixel)->green=(pixel)->blue=(Quantum) (value))
#define SetPixelGreen(pixel,value) ((pixel)->green=(Quantum) (value))
#define SetPixelIndex(indexes,value) (*(indexes)=(IndexPacket) (value))
#define SetPixelL(pixel,value) ((pixel)->red=(Quantum) (value))
#define SetPixelMagenta(pixel,value) ((pixel)->green=(Quantum) (value))
#define SetPixelOpacity(pixel,value) ((pixel)->opacity=(Quantum) (value))
#define SetPixelRed(pixel,value) ((pixel)->red=(Quantum) (value))
#define SetPixelRgb(pixel,packet) \
{ \
  SetPixelRed(pixel,(packet)->red); \
  SetPixelGreen(pixel,(packet)->green); \
  SetPixelBlue(pixel,(packet)->blue); \
}
#define SetPixelRGBA(pixel,packet) \
{ \
  SetPixelRed(pixel,(packet)->red); \
  SetPixelGreen(pixel,(packet)->green); \
  SetPixelBlue(pixel,(packet)->blue); \
  SetPixelAlpha(pixel,(QuantumRange-(packet)->opacity)); \
}
#define SetPixelRGBO(pixel,packet) \
{ \
  SetPixelRed(pixel,(packet)->red); \
  SetPixelGreen(pixel,(packet)->green); \
  SetPixelBlue(pixel,(packet)->blue); \
  SetPixelOpacity(pixel,(packet)->opacity); \
}
#define SetPixelYellow(pixel,value) ((pixel)->blue=(Quantum) (value))
#define SetPixelY(pixel,value) ((pixel)->red=(Quantum) (value))

static inline MagickRealType AbsolutePixelValue(const MagickRealType x)
{
  return(x < 0.0 ? -x : x);
}

static inline Quantum ClampPixel(const MagickRealType value)
{ 
  if (value < 0.0)
    return((Quantum) 0); 
  if (value >= (MagickRealType) QuantumRange)
    return((Quantum) QuantumRange);
#if !defined(MAGICKCORE_HDRI_SUPPORT)
  return((Quantum) (value+0.5));
#else
  return((Quantum) value);
#endif
}

static inline MagickRealType GetPixelLuma(
  const Image *magick_restrict image,const PixelPacket *magick_restrict pixel)
{
  MagickRealType
    intensity;

  (void) image;
  intensity=(MagickRealType) (0.212656f*pixel->red+0.715158f*pixel->green+
    0.072186f*pixel->blue);
  return(intensity);
}

static inline MagickRealType GetPixelLuminance(
  const Image *magick_restrict image,const PixelPacket *magick_restrict pixel)
{
  MagickRealType
    intensity;

  if (image->colorspace != sRGBColorspace)
    {
      intensity=(MagickRealType) (0.212656f*pixel->red+0.715158f*pixel->green+
        0.072186f*pixel->blue);
      return(intensity);
    }
  intensity=(MagickRealType) (0.212656*DecodePixelGamma((MagickRealType)
    pixel->red)+0.715158*DecodePixelGamma((MagickRealType) pixel->green)+
    0.072186*DecodePixelGamma((MagickRealType) pixel->blue));
  return(intensity);
}

static inline void GetPixelPacketRGBA(const Quantum red,const Quantum green,
  const Quantum blue,const Quantum opacity,PixelPacket *magick_restrict pixel)
{
  pixel->red=red;
  pixel->green=green;
  pixel->blue=blue;
  pixel->opacity=opacity;
}

static inline MagickBooleanType IsPixelAtDepth(const Quantum pixel,
  const QuantumAny range)
{
  Quantum
    quantum;

  if (range == 0)
    return(MagickTrue);
#if !defined(MAGICKCORE_HDRI_SUPPORT)
  quantum=(Quantum) (((MagickRealType) QuantumRange*((QuantumAny)
    (((MagickRealType) range*pixel)/QuantumRange+0.5)))/range+0.5);
#else
  quantum=(Quantum) (((MagickRealType) QuantumRange*((QuantumAny)
    (((MagickRealType) range*(MagickRealType) pixel)/(MagickRealType) QuantumRange+
    0.5)))/(MagickRealType) range);
#endif
  return(pixel == quantum ? MagickTrue : MagickFalse);
}

static inline MagickBooleanType IsPixelGray(const PixelPacket *pixel)
{
  MagickRealType
    green_blue,
    red_green;

  red_green=(MagickRealType) pixel->red-(MagickRealType) pixel->green;
  green_blue=(MagickRealType) pixel->green-(MagickRealType) pixel->blue;
  if (((QuantumScale*AbsolutePixelValue(red_green)) < MagickEpsilon) &&
      ((QuantumScale*AbsolutePixelValue(green_blue)) < MagickEpsilon))
    return(MagickTrue);
  return(MagickFalse);
}

static inline MagickBooleanType IsPixelMonochrome(
  const PixelPacket *pixel)
{
  MagickRealType
    green_blue,
    red,
    red_green;

  red=(MagickRealType) pixel->red;
  if ((AbsolutePixelValue(red) >= MagickEpsilon) &&
      (AbsolutePixelValue(red-(double) QuantumRange) >= MagickEpsilon))
    return(MagickFalse);
  red_green=(MagickRealType) pixel->red-(double) pixel->green;
  green_blue=(MagickRealType) pixel->green-(double) pixel->blue;
  if (((QuantumScale*AbsolutePixelValue(red_green)) < MagickEpsilon) &&
      ((QuantumScale*AbsolutePixelValue(green_blue)) < MagickEpsilon))
    return(MagickTrue);
  return(MagickFalse);
}

static inline Quantum PixelPacketIntensity(const PixelPacket *pixel)
{
  MagickRealType
    intensity;

  if ((pixel->red  == pixel->green) && (pixel->green == pixel->blue))
    return(pixel->red);
  intensity=(MagickRealType) (0.212656f*pixel->red+0.715158f*pixel->green+
    0.072186f*pixel->blue);
  return(ClampToQuantum(intensity));
}

static inline void SetPixelViaMagickPixel(const Image *magick_restrict image,
  const MagickPixelPacket *magick_restrict magick_pixel,
  PixelPacket *magick_restrict pixel)
{ 
  pixel->red=ClampToQuantum(magick_pixel->red);
  pixel->green=ClampToQuantum(magick_pixel->green);
  pixel->blue=ClampToQuantum(magick_pixel->blue);
  if (image->matte != MagickFalse)
    pixel->opacity=ClampToQuantum(magick_pixel->opacity);
}

#if defined(__cplusplus) || defined(c_plusplus)
}
#endif

#endif

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