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molong
2016-06-21 17:13:19 +08:00
parent 7ea154d684
commit 18896b4e98
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extend/org/image/driver/Gd.php Normal file
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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2016 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: 麦当苗儿 <zuojiazi.cn@gmail.com> <http://www.zjzit.cn>
// +----------------------------------------------------------------------
namespace org\image\driver;
use Exception;
class Gd
{
/**
* 图像资源对象
*
* @var resource
*/
private $im;
/**
* @var $git org\image\driver\Gif
*/
private $gif;
/**
* 图像信息，包括 width, height, type, mime, size
*
* @var array
*/
private $info;
/**
* 构造方法，可用于打开一张图像
*
* @param string $imgname 图像路径
*/
public function __construct($imgname = null)
{
$imgname && $this->open($imgname);
}
/**
* 打开一张图像
*
* @param string $imgname 图像路径
*
* @return $this
* @throws \Exception
*/
public function open($imgname)
{
//检测图像文件
if (!is_file($imgname)) {
throw new \Exception('不存在的图像文件');
}
//获取图像信息
$info = getimagesize($imgname);
//检测图像合法性
if (false === $info || (IMAGETYPE_GIF === $info[2] && empty($info['bits']))) {
throw new Exception('非法图像文件');
}
//设置图像信息
$this->info = [
'width' => $info[0],
'height' => $info[1],
'type' => image_type_to_extension($info[2], false),
'mime' => $info['mime'],
];
//销毁已存在的图像
empty($this->im) || imagedestroy($this->im);
//打开图像
if ('gif' == $this->info['type']) {
$class = '\\Think\\Image\\Driver\\Gif';
$this->gif = new $class($imgname);
$this->im = imagecreatefromstring($this->gif->image());
} else {
$fun = "imagecreatefrom{$this->info['type']}";
$this->im = $fun($imgname);
}
return $this;
}
/**
* 保存图像
*
* @param string $imgname 图像保存名称
* @param string $type 图像类型
* @param boolean $interlace 是否对JPEG类型图像设置隔行扫描
*
* @return $this
* @throws Exception
*/
public function save($imgname, $type = null, $interlace = true)
{
if (empty($this->im)) {
throw new Exception('没有可以被保存的图像资源');
}
//自动获取图像类型
if (is_null($type)) {
$type = $this->info['type'];
} else {
$type = strtolower($type);
}
//JPEG图像设置隔行扫描
if ('jpeg' == $type || 'jpg' == $type) {
$type = 'jpeg';
imageinterlace($this->im, $interlace);
}
//保存图像
if ('gif' == $type && !empty($this->gif)) {
$this->gif->save($imgname);
} else {
$fun = "image{$type}";
$fun($this->im, $imgname);
}
return $this;
}
/**
* 返回图像宽度
* @return int 图像宽度
* @throws Exception
*/
public function width()
{
if (empty($this->im)) {
throw new Exception('没有指定图像资源');
}
return $this->info['width'];
}
/**
* 返回图像高度
* @return int 图像高度
* @throws Exception
*/
public function height()
{
if (empty($this->im)) {
throw new Exception('没有指定图像资源');
}
return $this->info['height'];
}
/**
* 返回图像类型
* @return string 图像类型
* @throws Exception
*/
public function type()
{
if (empty($this->im)) {
throw new Exception('没有指定图像资源');
}
return $this->info['type'];
}
/**
* 返回图像MIME类型
* @return string 图像MIME类型
* @throws Exception
*/
public function mime()
{
if (empty($this->im)) {
throw new Exception('没有指定图像资源');
}
return $this->info['mime'];
}
/**
* 返回图像尺寸数组 0 - 图像宽度，1 - 图像高度
* @return array 图像尺寸
* @throws Exception
*/
public function size()
{
if (empty($this->im)) {
throw new Exception('没有指定图像资源');
}
return [$this->info['width'], $this->info['height']];
}
/**
* 裁剪图像
*
* @param integer $w 裁剪区域宽度
* @param integer $h 裁剪区域高度
* @param integer $x 裁剪区域x坐标
* @param integer $y 裁剪区域y坐标
* @param integer $width 图像保存宽度
* @param integer $height 图像保存高度
*
* @return $this
* @throws Exception
*/
public function crop($w, $h, $x = 0, $y = 0, $width = null, $height = null)
{
if (empty($this->im)) {
throw new Exception('没有可以被裁剪的图像资源');
}
//设置保存尺寸
empty($width) && $width = $w;
empty($height) && $height = $h;
do {
//创建新图像
$img = imagecreatetruecolor($width, $height);
// 调整默认颜色
$color = imagecolorallocate($img, 255, 255, 255);
imagefill($img, 0, 0, $color);
//裁剪
imagecopyresampled($img, $this->im, 0, 0, $x, $y, $width, $height, $w, $h);
imagedestroy($this->im); //销毁原图
//设置新图像
$this->im = $img;
} while (!empty($this->gif) && $this->gifNext());
$this->info['width'] = $width;
$this->info['height'] = $height;
return $this;
}
/**
* 生成缩略图
*
* @param integer $width 缩略图最大宽度
* @param integer $height 缩略图最大高度
* @param int $type 缩略图裁剪类型
*
* @return $this
* @throws Exception
*/
public function thumb($width, $height, $type = THINKIMAGE_THUMB_SCALING)
{
if (empty($this->im)) {
throw new Exception('没有可以被缩略的图像资源');
}
//原图宽度和高度
$w = $this->info['width'];
$h = $this->info['height'];
/* 计算缩略图生成的必要参数 */
switch ($type) {
/* 等比例缩放 */
case THINKIMAGE_THUMB_SCALING:
//原图尺寸小于缩略图尺寸则不进行缩略
if ($w < $width && $h < $height) {
return false;
}
//计算缩放比例
$scale = min($width / $w, $height / $h);
//设置缩略图的坐标及宽度和高度
$x = $y = 0;
$width = $w * $scale;
$height = $h * $scale;
break;
/* 居中裁剪 */
case THINKIMAGE_THUMB_CENTER:
//计算缩放比例
$scale = max($width / $w, $height / $h);
//设置缩略图的坐标及宽度和高度
$w = $width / $scale;
$h = $height / $scale;
$x = ($this->info['width'] - $w) / 2;
$y = ($this->info['height'] - $h) / 2;
break;
/* 左上角裁剪 */
case THINKIMAGE_THUMB_NORTHWEST:
//计算缩放比例
$scale = max($width / $w, $height / $h);
//设置缩略图的坐标及宽度和高度
$x = $y = 0;
$w = $width / $scale;
$h = $height / $scale;
break;
/* 右下角裁剪 */
case THINKIMAGE_THUMB_SOUTHEAST:
//计算缩放比例
$scale = max($width / $w, $height / $h);
//设置缩略图的坐标及宽度和高度
$w = $width / $scale;
$h = $height / $scale;
$x = $this->info['width'] - $w;
$y = $this->info['height'] - $h;
break;
/* 填充 */
case THINKIMAGE_THUMB_FILLED:
//计算缩放比例
if ($w < $width && $h < $height) {
$scale = 1;
} else {
$scale = min($width / $w, $height / $h);
}
//设置缩略图的坐标及宽度和高度
$neww = $w * $scale;
$newh = $h * $scale;
$x = $this->info['width'] - $w;
$y = $this->info['height'] - $h;
$posx = ($width - $w * $scale) / 2;
$posy = ($height - $h * $scale) / 2;
do {
//创建新图像
$img = imagecreatetruecolor($width, $height);
// 调整默认颜色
$color = imagecolorallocate($img, 255, 255, 255);
imagefill($img, 0, 0, $color);
//裁剪
imagecopyresampled($img, $this->im, $posx, $posy, $x, $y, $neww, $newh, $w, $h);
imagedestroy($this->im); //销毁原图
$this->im = $img;
} while (!empty($this->gif) && $this->gifNext());
$this->info['width'] = $width;
$this->info['height'] = $height;
return $this;
/* 固定 */
case THINKIMAGE_THUMB_FIXED:
$x = $y = 0;
break;
default:
throw new Exception('不支持的缩略图裁剪类型');
}
/* 裁剪图像 */
$this->crop($w, $h, $x, $y, $width, $height);
return $this;
}
/**
* 添加水印
*
* @param string $source 水印图片路径
* @param int $locate 水印位置
*
* @return $this
* @throws Exception
* @internal param int $alpha 水印透明度
*/
public function water($source, $locate = THINKIMAGE_WATER_SOUTHEAST)
{
//资源检测
if (empty($this->im)) {
throw new Exception('没有可以被添加水印的图像资源');
}
if (!is_file($source)) {
throw new Exception('水印图像不存在');
}
//获取水印图像信息
$info = getimagesize($source);
if (false === $info || (IMAGETYPE_GIF === $info[2] && empty($info['bits']))) {
throw new Exception('非法水印文件');
}
//创建水印图像资源
$fun = 'imagecreatefrom' . image_type_to_extension($info[2], false);
$water = $fun($source);
//设定水印图像的混色模式
imagealphablending($water, true);
/* 设定水印位置 */
switch ($locate) {
/* 右下角水印 */
case THINKIMAGE_WATER_SOUTHEAST:
$x = $this->info['width'] - $info[0];
$y = $this->info['height'] - $info[1];
break;
/* 左下角水印 */
case THINKIMAGE_WATER_SOUTHWEST:
$x = 0;
$y = $this->info['height'] - $info[1];
break;
/* 左上角水印 */
case THINKIMAGE_WATER_NORTHWEST:
$x = $y = 0;
break;
/* 右上角水印 */
case THINKIMAGE_WATER_NORTHEAST:
$x = $this->info['width'] - $info[0];
$y = 0;
break;
/* 居中水印 */
case THINKIMAGE_WATER_CENTER:
$x = ($this->info['width'] - $info[0]) / 2;
$y = ($this->info['height'] - $info[1]) / 2;
break;
/* 下居中水印 */
case THINKIMAGE_WATER_SOUTH:
$x = ($this->info['width'] - $info[0]) / 2;
$y = $this->info['height'] - $info[1];
break;
/* 右居中水印 */
case THINKIMAGE_WATER_EAST:
$x = $this->info['width'] - $info[0];
$y = ($this->info['height'] - $info[1]) / 2;
break;
/* 上居中水印 */
case THINKIMAGE_WATER_NORTH:
$x = ($this->info['width'] - $info[0]) / 2;
$y = 0;
break;
/* 左居中水印 */
case THINKIMAGE_WATER_WEST:
$x = 0;
$y = ($this->info['height'] - $info[1]) / 2;
break;
default:
/* 自定义水印坐标 */
if (is_array($locate)) {
list($x, $y) = $locate;
} else {
throw new Exception('不支持的水印位置类型');
}
}
do {
//添加水印
$src = imagecreatetruecolor($info[0], $info[1]);
// 调整默认颜色
$color = imagecolorallocate($src, 255, 255, 255);
imagefill($src, 0, 0, $color);
imagecopy($src, $this->im, 0, 0, $x, $y, $info[0], $info[1]);
imagecopy($src, $water, 0, 0, 0, 0, $info[0], $info[1]);
imagecopymerge($this->im, $src, $x, $y, 0, 0, $info[0], $info[1], 100);
//销毁零时图片资源
imagedestroy($src);
} while (!empty($this->gif) && $this->gifNext());
//销毁水印资源
imagedestroy($water);
return $this;
}
/**
* 图像添加文字
*
* @param string $text 添加的文字
* @param string $font 字体路径
* @param integer $size 字号
* @param string $color 文字颜色
* @param int $locate 文字写入位置
* @param integer $offset 文字相对当前位置的偏移量
* @param integer $angle 文字倾斜角度
*
* @return $this
* @throws Exception
*/
public function text($text, $font, $size, $color = '#00000000',
$locate = THINKIMAGE_WATER_SOUTHEAST, $offset = 0, $angle = 0) {
//资源检测
if (empty($this->im)) {
throw new Exception('没有可以被写入文字的图像资源');
}
if (!is_file($font)) {
throw new Exception("不存在的字体文件：{$font}");
}
//获取文字信息
$info = imagettfbbox($size, $angle, $font, $text);
$minx = min($info[0], $info[2], $info[4], $info[6]);
$maxx = max($info[0], $info[2], $info[4], $info[6]);
$miny = min($info[1], $info[3], $info[5], $info[7]);
$maxy = max($info[1], $info[3], $info[5], $info[7]);
/* 计算文字初始坐标和尺寸 */
$x = $minx;
$y = abs($miny);
$w = $maxx - $minx;
$h = $maxy - $miny;
/* 设定文字位置 */
switch ($locate) {
/* 右下角文字 */
case THINKIMAGE_WATER_SOUTHEAST:
$x += $this->info['width'] - $w;
$y += $this->info['height'] - $h;
break;
/* 左下角文字 */
case THINKIMAGE_WATER_SOUTHWEST:
$y += $this->info['height'] - $h;
break;
/* 左上角文字 */
case THINKIMAGE_WATER_NORTHWEST:
// 起始坐标即为左上角坐标，无需调整
break;
/* 右上角文字 */
case THINKIMAGE_WATER_NORTHEAST:
$x += $this->info['width'] - $w;
break;
/* 居中文字 */
case THINKIMAGE_WATER_CENTER:
$x += ($this->info['width'] - $w) / 2;
$y += ($this->info['height'] - $h) / 2;
break;
/* 下居中文字 */
case THINKIMAGE_WATER_SOUTH:
$x += ($this->info['width'] - $w) / 2;
$y += $this->info['height'] - $h;
break;
/* 右居中文字 */
case THINKIMAGE_WATER_EAST:
$x += $this->info['width'] - $w;
$y += ($this->info['height'] - $h) / 2;
break;
/* 上居中文字 */
case THINKIMAGE_WATER_NORTH:
$x += ($this->info['width'] - $w) / 2;
break;
/* 左居中文字 */
case THINKIMAGE_WATER_WEST:
$y += ($this->info['height'] - $h) / 2;
break;
default:
/* 自定义文字坐标 */
if (is_array($locate)) {
list($posx, $posy) = $locate;
$x += $posx;
$y += $posy;
} else {
throw new Exception('不支持的文字位置类型');
}
}
/* 设置偏移量 */
if (is_array($offset)) {
$offset = array_map('intval', $offset);
list($ox, $oy) = $offset;
} else {
$offset = intval($offset);
$ox = $oy = $offset;
}
/* 设置颜色 */
if (is_string($color) && 0 === strpos($color, '#')) {
$color = str_split(substr($color, 1), 2);
$color = array_map('hexdec', $color);
if (empty($color[3]) || $color[3] > 127) {
$color[3] = 0;
}
} elseif (!is_array($color)) {
throw new Exception('错误的颜色值');
}
do {
/* 写入文字 */
$col = imagecolorallocatealpha($this->im, $color[0], $color[1], $color[2], $color[3]);
imagettftext($this->im, $size, $angle, $x + $ox, $y + $oy, $col, $font, $text);
} while (!empty($this->gif) && $this->gifNext());
return $this;
}
/* 切换到GIF的下一帧并保存当前帧，内部使用 */
private function gifNext()
{
ob_start();
ob_implicit_flush(0);
imagegif($this->im);
$img = ob_get_clean();
$this->gif->image($img);
$next = $this->gif->nextImage();
if ($next) {
$this->im = imagecreatefromstring($next);
return $next;
} else {
$this->im = imagecreatefromstring($this->gif->image());
return false;
}
}
/**
* 析构方法，用于销毁图像资源
*/
public function __destruct()
{
empty($this->im) || imagedestroy($this->im);
}
}