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。 sh-3ll

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#ifndef GD_COMPAT_H
#define GD_COMPAT_H 1

#if HAVE_GD_BUNDLED
# include "gd.h"
#else
# include <gd.h>
#endif

const char * gdPngGetVersionString();
const char * gdJpegGetVersionString();
int gdJpegGetVersionInt();
int overflow2(int a, int b);

/* filters section
 *
 * Negate the imag src, white becomes black,
 * The red, green, and blue intensities of an image are negated.
 * White becomes black, yellow becomes blue, etc.
 */
int gdImageNegate(gdImagePtr src);

/* Convert the image src to a grayscale image */
int gdImageGrayScale(gdImagePtr src);

/* Set the brightness level <brightness> for the image src */
int gdImageBrightness(gdImagePtr src, int brightness);

/* Set the contrast level <contrast> for the image <src> */
int gdImageContrast(gdImagePtr src, double contrast);

/* Simply adds or substracts respectively red, green or blue to a pixel */
int gdImageColor(gdImagePtr src, const int red, const int green, const int blue, const int alpha);

#if !defined(HAVE_GD_IMAGE_CONVOLUTION)
/* Image convolution by a 3x3 custom matrix */
int gdImageConvolution(gdImagePtr src, float ft[3][3], float filter_div, float offset);
int gdImageEdgeDetectQuick(gdImagePtr src);
int gdImageGaussianBlur(gdImagePtr im);
int gdImageSelectiveBlur( gdImagePtr src);
int gdImageEmboss(gdImagePtr im);
int gdImageMeanRemoval(gdImagePtr im);
int gdImageSmooth(gdImagePtr im, float weight);
#endif

#if !defined(HAVE_GD_IMAGE_PIXELATE)
enum gdPixelateMode {
	GD_PIXELATE_UPPERLEFT,
	GD_PIXELATE_AVERAGE
};

int gdImagePixelate(gdImagePtr im, int block_size, const unsigned int mode);
#endif

int gdImagePixelate(gdImagePtr im, int block_size, const unsigned int mode);

#if !HAVE_GD_IMAGEELLIPSE
void gdImageEllipse(gdImagePtr im, int cx, int cy, int w, int h, int c);
#endif

gdImagePtr gdImageRotate (gdImagePtr src, double dAngle, int clrBack, int ignoretransparent);

int gdImageColorMatch (gdImagePtr im1, gdImagePtr im2);

#endif