一、类文档说明

class Image_Tool{
    /**
     * 构造Image_Tool对象
     * @param string|array $img_data
     * $img_data可以为图片的路径
     */
 function __construct($img_data="");

 /**
  * 添加文字注解，或用于文字水印
  * @access public
  * @param string $txt UTF8编码的文本
  * @param float $opacity 设置透明度
  * @param constant $gravity 
  * 设置文字摆放位置:
  * NorthWest,North,NorthEast,West, Center,East,SouthWest,South,SouthEast,Static
  * @param array $font 字体数组可以设置如下属性:
  * name,常量,字体名称，如果需要添加中文注解，请使用中文字体，否则中文会显示乱码。
     *        支持的字体：SimSun(宋体,默认)、SimKai(楷体)、SimHei(正黑)、MicroHei(微米黑)、Arial
     * weight,字体宽度,int
     * size，字体大小,int
     * color,字体颜色,例如："blue", "#0000ff", "rgb(0,0,255)"等，默认为"black";
     * @return boolean
  */
 function annotate($txt, $opacity, $gravity, array $font);

 /**
  * 将对象的数据重新初始化,用于多次重用一个Image_Tool对象
  * @access public
  * @return void
  */
 function clean();

 *
  * 图片合成，可以进行多张图片的合成，也可以做图片水印用
  * @access public
  * @param int $src_img 合成的目标图片，可以为ImageTool对象或图片二进制数据
  * @param int $x 合成在画布的X坐标
  * @param string $y 合成在画布的Y坐标
  * @return boolean
  * 
 function composite($src_img, $x, $y);

 /**
  * 返回错误信息
  * @access public
  * @return string
  */
 function errmsg();

 /**
  * 返回错误编号
  * @access public
  * @return int
  */
 function errcode();

 /**
  * 进行图片处理操作
  * @access public
  * @param string $format
  * @param boolean $display
  * @return boolean|string 若设置$display为true，返回void，否则返回图片二进制数据。失败时返回false
  */
 function exec($format, $display=false);

 /**
  * 水平翻转
  * @access public
  * @return boolean
  */
 function flipH();

 /**
  * 垂直翻转
  * @access public
  * @return boolean
  */
 function flipV();

 /**
  * 取得图片属性
  * @access public
  * @return array|boolean 错误返回false
  */
 function getImageAttr();

 /**
  * 去噪点,改善图片质量，通常用于exec之前
  * @access public
  * @return boolean
  */
 function improve();

 /**
  * 缩放图片,只指定width或者height时,将进行等比缩放
  * @access public
  * @param int $width
  * @param int $height
  * @param boolean $thumbnail 是否清除图片附加信息
  * @return boolean
  */
 function resize($width, $height, $thumbnail=true);

 /**
  * 按比例缩放.1为原大小
  * @access public
  * @param float $ratio
  * @param boolean $thumbnail 是否清除图片附加信息
  * @return boolean
  */
 function resizeRatio($ratio, $thumbnail=true);

 /**
  * 顺时针旋转图片
  * @access public
  * @param int $degree 旋转度数（0 - 360）
  * @return boolean
  */
 function rotate($degree=90);

 /**
  * 设置要处理的图片二进制数据
  * @access public
  * @param string $img_blob
  * @return boolean
  */
 function setData($img_blob);
}

三、扩展实现
1.php_fetch_url.h

/*
  +----------------------------------------------------------------------+
  | PHP Version 5                                                        |
  +----------------------------------------------------------------------+
  | Copyright (c) 1997-2012 The PHP Group                                |
  +----------------------------------------------------------------------+
  | This source file is subject to version 3.01 of the PHP license,      |
  | that is bundled with this package in the file LICENSE, and is        |
  | available through the world-wide-web at the following url:           |
  | http://www.php.net/license/3_01.txt                                  |
  | If you did not receive a copy of the PHP license and are unable to   |
  | obtain it through the world-wide-web, please send a note to          |
  | license@php.net so we can mail you a copy immediately.               |
  +----------------------------------------------------------------------+
  | Author:                                                              |
  +----------------------------------------------------------------------+
*/
/* $Id$ */
#ifndef PHP_IMAGE_TOOL_H
#define PHP_IMAGE_TOOL_H
extern zend_module_entry image_tool_module_entry;
#define phpext_image_tool_ptr &image_tool_module_entry
#ifdef PHP_WIN32
# define PHP_IMAGE_TOOL_API __declspec(dllexport)
#elif defined(__GNUC__) && __GNUC__ >= 4
# define PHP_IMAGE_TOOL_API __attribute__ ((visibility("default")))
#else
# define PHP_IMAGE_TOOL_API
#endif
#ifdef ZTS
#include "TSRM.h"
#endif
#define FETCH_THIS Z_OBJCE_P(getThis()), getThis()
#define IMAGETOOL_MAGICKWAND_RSRC_NAME "MagickWand"
#define IMAGETOOL_PIXELWAND_RSRC_NAME "PixelWand"
#define IMAGETOOL_NORTHWEST 1
#define IMAGETOOL_NORTH     2
#define IMAGETOOL_NORTHEAST 3
#define IMAGETOOL_WEST      4
#define IMAGETOOL_CENTER    5
#define IMAGETOOL_EAST      6
#define IMAGETOOL_SOUTHWEST 7
#define IMAGETOOL_SOUTH     8
#define IMAGETOOL_SOUTHEAST 9
#define IMAGETOOL_STATIC    10
#define IMAGETOOL_TOP_LEFT      1
#define IMAGETOOL_TOP_CENTER    2
#define IMAGETOOL_TOP_RIGHT     3
#define IMAGETOOL_CENTER_LEFT   4
#define IMAGETOOL_CENTER_CENTER 5
#define IMAGETOOL_CENTER_RIGHT  6
#define IMAGETOOL_BOTTOM_LEFT   7
#define IMAGETOOL_BOTTOM_CENTER 8
#define IMAGETOOL_BOTTOM_RIGHT  9
#define GET_MAGICK_WAND(zval, magick_wand) zval = zend_read_property(FETCH_THIS, ZEND_STRL("magick_wand"), 0 TSRMLS_CC);\
        ZEND_FETCH_RESOURCE_NO_RETURN(magick_wand, MagickWand*, &zval, -1, IMAGETOOL_MAGICKWAND_RSRC_NAME, le_image_wand);
PHP_MINIT_FUNCTION(image_tool);
PHP_MSHUTDOWN_FUNCTION(image_tool);
PHP_RINIT_FUNCTION(image_tool);
PHP_RSHUTDOWN_FUNCTION(image_tool);
PHP_MINFO_FUNCTION(image_tool);

#ifdef ZTS
#define IMAGE_TOOL_G(v) TSRMG(image_tool_globals_id, zend_image_tool_globals *, v)
#else
#define IMAGE_TOOL_G(v) (image_tool_globals.v)
#endif
#endif /* PHP_IMAGE_TOOL_H */

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