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 */
更多用c实现php扩展 image_tool 图片常用处理工具类的使用。