一個很實用的類別,php調整gif圖片的尺寸！-php教程-PHP中文網

} }

這個類別可以對GIF格式的動態檔案進行調整。提取動態圖片幀檔案到一個臨時目錄。調整圖像的大小並提取和重建成動畫的GIF格式的新檔案。

@地瓜不讓傳送gif圖片
效果查看:http://www.codepearl.com/files/187.html 一個很實用的類別,php調整gif圖片的尺寸！

//http://www.codepearl.com
require_once "gifresizer.php";
$gr = new gifresizer ;
$gr->temp_dir = "codepearl";
$gr->resize("codepearl.gif","codepearl_resized.gif",500,500);
?>

複製程式碼

/**
* http://www.codepearl.com
* 調整動畫GIF 檔案的大小
*
* ///重要說明：該腳本需要一個臨時目錄，應在其中提取所有幀。
* 建立一個權限等級為777的目錄，並將路徑寫入下面的$temp_dir變數中。
*
* 預設目錄是「frames」。
*/
class gifresizer {
public $temp_dir = "priframes" > private; pointer = 0 ;
private $index = 0 ; 🎜> 預設$handle = 0;
預設$orgvars = array();
預設$encda ta = array();
預設$parsedfiles = array();
預設$originalwidth = 0;
私人$wr,$hr;
私人$props = array();
私人$decoding = false *
* 類別的公共部分
*
* @orgfile - 原始檔案路徑
* @newfile - 帶路徑的新檔案名稱
* @width - 所需的圖片寬度
* @height - 所需的影像高度
*
* GIF 解碼器功能。
* 將 GIF 動畫解析為單幀。
* /
函數調整大小($orgfile,$newfile,$width,$height){
$this->decode($orgfile);
$this->wr=$width/ $this- > originalWidth;
$this->; hr=$height/$this->originalheight;
$this->resizeframes();
$this->encode($newfile,$width,$height);
$this->clearframes( );
}
/**
* GIF 編碼器功能。
* 將解析的 GIF 幀組合成一個動畫。
*/
DecodeDecode($filename){
$this->decoding = true;
$this->clearvariables();
$this->loadfile($filename);
$this->get_gif_header(); $this->get_application_data();
$this-> get_application_data();
$this->get_image_block(0); while(!$this->checkbyte(0x3b) && !$this->checkEOF(); ){
$this->get_comment_data(1) ;
$this->get_graphics_extension(2);
$this->get_image_block(2);
}
$this->writeframes (time());
$this->closefile();
$this->decoding = false; $newwidth , $newheight ) {
$神秘 = " " ; $this -> 指標 = 0 ; 🎜 > $this -> imagedata = array ()
$this->handle = 0;
$this->index=0;
$k=0 );
$this->loadfile( $imagepart);
$this->get_gif_header();
$this->get_application_data(); > $this->get_graphics_extension(0);
$this ->get_image_block(0); ta[ $this->index-1]))
$gxdata = $this->encda ta[$this->index-1]["graphicsextension"];
else
$gxdata = null ;
$ghdata=$this->imageinfo["gifheader"];
$trcolor="";
$hastransparency=($gxdata[3]&&1= =1);
if( $hastransparency){
$trcx = order($gxdata[6]);
//全域顏色表到影像資料;
$this->transfercolortable($this->imageinfo["gifheader"],$this->imagedata[$this->index -1][ “圖像資料”]);
$imageblock = &$this->imagedata[$this->index-1]["imagedata"];
//如果透明度存在則傳輸透明度索引
if ($hastransparency){
$haslocalcolortable = ((ord($imageblock[9])&128)==128);
if($haslocalcolortable){
//本地表存在。確定邊界並尋找它。
$tablesize=(pow(2,(ord($imageblock[9])&7) 1)*3) 10;
$this->orgvars[$this-> ;index-1]["transparent_color_index "] =
((strrpos(substr($this->imagedata[$this->index-1]["imagedata"],0,$tablesize),$trcolor )-10)/3);
}else{
//本地表不存在，查看全域表
$tablesize=(pow(2,(ord($gxdata[10])&7) 1)*3) 10 ;
$ this->orgvars[$this->index-1]["transparent_color_index"] =
((strrpos(substr($ghdata,0,$tablesize),$trcolor)-10) /3);
}
}
// 將原始延遲時間、透明索引和處置值應用於圖形擴充
if(!$this->imagedata[$this->; index-1 ]["graphicsextension"]) $this->imagedata[$this->index-1]["graphicsextension"] = chr(0x21).chr(0xf9).chr(0x04).chr(0x00 ).chr(0x00 ).chr(0x00).chr(0x00).chr(0x00);
$imagedata = &$this->imagedata[$this->index-1][" GraphicsExtension"];
$imagedata[3] = chr((ord($imagedata[3]) & 0xE3) | ($this->orgvars[$this->index-1][" dispose_method"] $imagedata[4] = chr(($this->orgvars[$this->index-1]["delay_time"] % 256));
$imagedata[5] = chr(floor($ this->orgvars[$this->index-1]["delay_time"] / 256));
if($hastransparency){
$imagedata[6] = chr($this->orgvars[$ this->index-1]["transparent_color_index"]);
}
$imagedata[3] = chr(ord($imagedata [3])|$hastransparency);
//應用計算出的左側和頂部偏移
$imageblock[1] = chr(round(($this->orgvars[$this->index) -1]["offset_left"]*$this->wr ) % 256));
$imageblock[2] = chr(floor(($this->orgvars[$this->index-1) ]["offset_left"]*$this->wr) / 256) );
$imageblock[3] = chr(round(($this->orgvars[$this->index-1][ "offset_top"]*$this->hr) % 256));
$imageblock[4] = chr(floor(($this->orgvars[$this->index-1]["offset_top) "]*$this->hr) / 256));
if ($this->index==1){
if(!isset($this->imageinfo["applicationdata"]) || !$this->imageinfo[" applicationdata"])
$this- >imageinfo["applicationdata"]=chr(0x21).chr(0xff).chr(0x0b)."NETSCAPE2.0".chr(0x03).chr(0x01)。 chr(0x00).chr(0x00).chr(0x00);
if(!isset($this->imageinfo["commentdata"]) || !$this->imageinfo["commentdata"])
$this->imageinfo["commentdata"] = chr(0x21).chr(0xfe).chr(0x10)."PHPGIFRESIZER1.0".chr(0);
$mystring .= $this ->orgvars [“gifheader”]。 $this->imageinfo["applicationdata"].$this->imageinfo["commentdata"];
if(isset($this->orgvars["hasgx_type_0"]) && $this->orgvars ["hasgx_type_0" ]) $mystring .= $this->globaldata["graphicsextension_0"];
if(isset($this->orgvars["hasgx_type_1"]) && $this->orgvars[" hasgx_type_1"]) $mystring . = $this->globaldata["graphicsextension"];
}
$mystring .= $imagedata 。 $imageblock;
$k ;
$this->closefile();
}
$mystring .= chr(0x3b);
//對 gif 標題套用新的寬度和高度
$mystring[6] = chr($newwidth % 256);
$mystring[7] = chr(floor($newwidth / 256) ));
$mystring[8] = chr($newheight % 256);
$mystring[9] = chr(floor($newheight / 256));
$mystring[11] = $ this->orgvars["background_color"];
//if(file_exists($new_filename)){unlink($new_filename);}
file_put_contents($new_filename,$mystring);
}
/**
* 變數重設功能
* 如果一個實例被多次使用，則需要它。相信我。
*/
私人函數clearvariables(){
$this->pointer = 0;
$this->index = 0;
$this - >imagedata = array();
$this->imageinfo = array();
$this->handle = 0;
$this->parsedfiles = array();
}
/**
* 清除幀功能
* 用於編碼後刪除幀。
*/
牛皮函數clearframes () {
foreach($this->parsedfiles as $temp_frame){
unlink($temp_frame);
}
}
/**
* 幀寫入器
* 將 GIF 幀寫入檔案。
*/
私有函數writeframes($prepend){
for($i=0;$iimagedata);$i ){
file_put_contents($this->temp_dir. "/frame_". $prepend."_".str_pad($i,2,"0",STR_PAD_LEFT).".gif",$this->imageinfo["gifheader"].$this->imagedata[ $i]["graphicsextension" ].$this->imagedata[$i]["imagedata"].chr(0x3b));
$this->parsedfiles[]=$this->temp_dir。 ".str_pad($i,2,"0",STR_PAD_LEFT).".gif";
}
}
/**
* 調色盤傳輸裝置
* 將全域色表（GCT）從影格傳送到動畫中的局部色表。
*/
私有函數transfercolortable( $src,&$dst){
//src為gif頭，dst為圖像資料塊
//如果全域色表存在，則傳輸
if ((ord($src[10]) &128)==128){
//Gif 標題全域顏色表長度
$ghctl = pow(2,$this->readbits(ord($src[ 10]),5,3) 1)* 3;
//從gif頭中剪下全域顏色表
$ghgct = substr($src,13,$ghctl);
//檢查圖片區塊顏色表長度
if(( ord ($dst[9])&128)==128){
//影像資料包含色表。最後一個顏色表長度，以便我們可以中斷虛擬顏色表
$idctl = pow(2,$this ->readbits(ord($dst[9]),5,3) 1)*3;
//設定顏色表標誌與長度
$dst[9] = chr(ord($dst[9]) | (0x80 | (log($ghctl/3,2)-1)));
//注入顏色表
$dst = substr($dst,0,10).$ghgct. substr($dst,-1*strlen($dst) 10);
}
}else{
//全域顏色表不存在。 >
/**
* GIF 解析器函數。
* 以下函數是解析器的主要結構組件。
*/
private function get_gif_header(){
$this->p_forward(10);
if ($this->readbits(($mybyte=$this ->readbyte_int()),0,1)==1){
$this->p_forward(2);
$this->p_forward(pow(2,$this->readbits($mybyte, 5,3) 1)*3);
}else{
$this->p_forward(2);
}
$this->imageinfo["gifheader"]=$ this->datapart(0,$this->指針);
if($this->解碼){
$this->orgvars["gifheader"]=$this->imageinfo["gifheader"] ;
$this->originalwidth = ord($this->orgvars["gifheader"][ 7])*256 ord($this->orgvars["gifheader"][6]);
$this ->originalheight = ord($this->orgvars["gifheader"][9]) *256 ord($this->orgvars["gifheader"][8]);
$this->orgvars["background_color "]=$this->orgvars["gifheader"][11];
}
}
//--------------------------------------------- ----------- ----------- ----------
private function get_application_data(){
$startdata = $this- >readbyte(2);
if( $startdata==chr(0x21).chr (0xff)){
$start = $this->pointer - 2;
$this->p_forward($ this->readbyte_int());
$this->read_data_stream( $this->readbyte_int());
$this->imageinfo["applicationdata"] = $this->datapart($start,$ this->pointer-$start);
} else{
$this->p_rewind(2);
}
}
//---------- -------------- --- ---------------------------------
private function get_comment_data(){
$startdata = $this ->readbyte(2);
if($startdata==chr(0x21).chr(0xfe)){
$start =chr(0x21).chr(0xfe)){
$start = $this->指標- 2;
$this- > ;read_data_stream($this->readbyte_int());
$this->imageinfo["commentdata"] = $this->datapart($start, $this->pointer-$start);
} else{
$this->p_rewind(2);
}
}
//--------- ---------- ---- ------------------------------------ --------------------
創傷函數 get_graphics_extension ($type){
$startdata = $this->readbyte(2);
if ($startdata==chr(0x21).chr(0xf9)){
$start = $this->指標- 2;
$this->p_forward($this->readbyte_int());
$this->p_forward(1);
if($type==2){
$ this-> ;imagedata[$this->index]["graphicsextension"] = $this->datapart( $start,$this->pointer-$start);
}else if($type==1) {
$this->orgvars["hasgx_type_1"] = 1;
$this-> globaldata["graphicsextension"] = $this->datapart($start,$this->pointer- $start);
}else if($type==0 && $this->decoding==false){
$this->encda[$this->index]["graphicsextension"] = $this- >datapart($start,$this->指標-$start);
}else if ($type==0 && $this->decoding==true){
$this->orgvars["hasgx_type_0 "] = 1;
$this->globaldata["graphicsextension_0"] = $this- >datapart($start,$this->pointer-$start);
}
}else{
$this->p_rewind(2);
}
}
/ /---------------- ------------ --------------------- -------------------------------
解剖函數get_image_block($type) {
if($this- >checkbyte(0x2c)){
$start = $this->pointer;
$this->p_forward(9);
if($this ->readbits (($mybyte=$this-> readbyte_int()),0,1)==1){
$this->p_forward(pow(2,$this->readbits($mybyte,5,3) 1 )*3);
}
$this->p_forward(1);
$this->read_data_stream($this->readbyte_int());
$this->imagedata[$this ->index]["imagedata"] = $this->datapart($start,$this->pointer-$start);
if ($type==0){
$this- >orgvars["hasgx_type_0"] = 0 ;
if(isset($this->globaldata["graphicsextension_0"]))
$this ->imagedata[$this->index]["graphicsextension"]= $this->globaldata["graphicsextension_0" ];
else
$this->imagedata[$this->index ]["graphicsextension"]=null;
unset($this->globaldata[" GraphicsExtension_0"]);
} elseif($type==1){
if(isset($this->orgvars["hasgx_type_1"]) && $this->orgvars["hasgx_type_1"]==1 ){
$this-> orgvars["hasgx_type_1"] = 0;
$this-> ;imagedata[$this->index]["graphicsextension"]=$this->globaldata["graphicsextension"] ;
unset($this- >globaldata["graphicsextension"]); }else{
$this->orgvars["hasgx_type_0"] = 0;
$this->imagedata[$this->index]["graphicsextension"]=$this->globaldata[" GraphicsExtension_0"];
unset($this->globaldata["graphicsextension_0"]);
}
}
$this->parse_image_data();
$this ->index ;
}
}
//---------------------------- -------- ------------------
原生函數parse_image_data(){
$this->imagedata[$this->; 索引]["disposal_method"] = $ this->get_imagedata_bit("ext",3,3,3);
$this->imagedata[$this->index]["user_input_flag"] = $this->get_imagedata_bit("ext",3,6 ,1);
$this->imagedata[$this->index]["transparent_color_flag"] = $this->get_imagedata_bit("ext" ,3,7,1);
$this->imagedata [$this->index]["delay_time"] = $this->dualbyteval($this->get_imagedata_byte("ext",4 ,2));
$this->imagedata[$this->index] ["transparent_color_index"] = ord($this->get_imagedata_byte("ext",6,1));
$this->imagedata[$this->index]["offset_left"] = $this->dualbyteval ($this->get_imagedata_byte("dat",1,2));
$this->imagedata[$this->index]["offset_top"] = $this->dualbyteval($this->get_imagedata_byte( "dat",3,2));
$this->imagedata [$this->index]["width"] = $this->dualbyteval($this->get_imagedata_byte("dat",5,2 ));
$this->imagedata[$this ->index]["height"] = $this->dualbyteval($this->get_imagedata_byte("dat",7,2));
$這->圖像數據[$這->; index]["local_color_table_flag"] = $this->get_imagedata_bit("dat",9,0,1);
$this->imagedata[$this->index]["interlace_flag"] = $this-> get_imagedata_bit("dat",9,1,1);
$this->imagedata[$this->index]["sort_flag"] = $this->get_imagedata_bit("dat" ,9,2,1) ;
$this->imagedata[$this->index]["color_table_size"] = pow(2,$this->get_imagedata_bit("dat",9,5, 3) 1)*3;
$this->imagedata[$this->index]["color_table"] = substr($this->imagedata[$this->index]["imagedata"],10,$this->imagedata[$this-> index]["color_table_size"]);
$this->imagedata[$this->index]["lzw_code_size"] = ord( $this->get_imagedata_byte("dat",10,1));
if($this->解碼){
$this->orgvars[$this->index]["transparent_color_flag "] = $this->imagedata[$this->index]["transparent_color_flag"];
$this->orgvars[$this->index]["transparent_color_index"] = $this-> ;imagedata[$this->index]["transparent_color_index"];
$this->orgvars[$this ->index]["delay_time"] = $this->imagedata[$this-> ;index]["delay_time"];
$this->orgvars[$this->index]["disposal_method"] = $this->imagedata[$this->index]["disposal_method" ];
$this->orgvars[$this->index]["offset_left"] = $this->imagedata[$this->index ]["offset_left"];
$this ->orgvars[$this->index]["offset_top"] = $this->imagedata[$this->index]["offset_top"];
}
}
/ /----------------------------------------- --------------- -------- ------
private function get_imagedata_byte($type,$start,$length){
if ($type=="ext")
return substr( $this->imagedata[$this->index]["graphicsextension"],$start,$length);
elseif($type==" dat")
return substr($this->imagedata[ $this->;索引]["imagedata"],$start,$length);
}
//--------------------------------------------- ----------- ----------- ----------
private function get_imagedata_bit($type,$byteindex,$bitstart,$bitlength ){
if($type== "ext")
return $this->readbits(ord(substr($this->imagedata[$this->index]["graphicsextension"],$byteindex, 1)),$bitstart,$bitlength);
elseif($type= ="dat")
return $this->readbits(ord(substr($this->imagedata[$this->index] ["imagedata"],$byteindex,1) ),$bitstart, $bitlength);
}
//--------------------- ----------- -------- ------------------
臍函數dualbyteval($s){
$i = ord($s[1] )*256 ord($s[ 0]);
return $i;
}
//----------- - 輔助函數-------- -------- -----
私有函數read_data_stream($first_length){
$this->p_forward($first_length);
$length=$this->readbyte_int() ;
if( $length!=0) {
while($length!=0){
$this->p_forward($length);
$length=$this->readbyte_int( );
}
}
回傳true;
}
//-------------- -------------------------- --------------- --------- -----------------
私有函數loadfile($filename ){
$this->handle = fopen($檔名,"rb");
$this->pointer = 0;
}
//-------- ------------------------ ------------------------
private function closefile(){
fclose($this->handle);
$this ->handle=0;
}
//------------ -------------- --------- ----------------------
私有函數readbyte($byte_count){
$data = fread( $this->handle,$byte_count) ;
$this->pointer = $byte_count;
return $data;
}
//--------------------- --- ------------------------------------ ----------- -----------
原生函數readbyte_int(){
$data = fread($this->handle,1);
$this->指標;
return ord($data);
}
/ /------------------------ ----------- -------------- ------
私有函式readbits($byte,$start,$length){
$bin = str_pad(decbin($byte) ,8,"0",STR_PAD_LEFT);
$ data = substr($bin,$start,$length);
return bindec($data);
}
//--- -------------------------------------------------- --- -------------
蠟燭函數p_rewind($length){
$this->pointer-=$length;
fseek($this->handle ,$this ->指標);
}
//-------- ------------------------- --- -------------------------------
私有函數p_forward($length){
$this ->指標=$length;
fseek($this->句柄,$this->指標);
}
// ---------------- --- ------------------------------- -----
private function datapart($start,$ length){
fseek($this->handle,$start);
$data = fread($this->handle, $length);
fseek($this->句柄,$this- >指標) ;
return $data;
}
//------------ ------------------ -------- -----------------------------------
蠟燭函數checkbyte( $byte){
if (fgetc($this->handle)==chr($byte)){
fseek($this->handle,$this->pointer);
return true;
}else{
fseek($this->句柄,$this->指針);
return false;
}
}
// ------- -------- ----------------------------------- -----
陰道函數checkEOF(){
if(fgetc($this->handle)===false){
return true;
}else{
fseek ($this->句柄,$this->句柄,$this-> 句柄this->指標);
return false;
}
}
//------------------------- --- ------------------ ----------------------------- -----
/**
* 偵錯功能。
* 將 GIF 動畫解析為單幀。
* /
私有函式debug($string){
echo "
```
";
```
登入後複製
登入後複製
for($i=0;$i echo str_pad(dechex(ord($ string[$i])),2,"0",STR_PAD_LEFT)。 ";
}
//--------------------------------------------- ----------- ----------- ----------
private function debuglen($var,$len){
echo "
```
";
```
登入後複製
登入後複製
for( $i=0;$i echo str_pad(dechex(ord($var[$i])),2,"0" ,STR_PAD_LEFT)。 " ";
}
echo "";
}
//----------------------- - ------------- ---------------------------------
原生函數debugstream($length){
$this->debug($this->datapart($this->pointer,$length));
}
//------- - --------- ---------------------------------------- ------------- --------
/**
* GD Resizer Device
* 調整動畫影格的大小
*/
私有函數resizeframes(){
$k=0;
foreach($this->parsedfiles as $img) {
$src = imagecreatefromgif($img);
$sw = $這->imagedata[$k]["width"];
$sh = $this->imagedata[$k][ "高度"];
$nw = round($sw * $this ->wr);
$nh = round($sh * $this- >hr);
$sprite = imagecreatetruecolor($西北，$nh）；
$trans = imagecolortransparent($sprite);
imagealphablending($sprite, false);
imagesavealpha($sprite, true);
imagepalettecopy($sprite,$src);
imagefill($sprite,0,0,imagecolortransparent($src));
imagecolortransparent($sprite,imagecolortransparent($src));
imagecopyresized($sprite,$src,0,0,0,0,$nw,$nh,$sw,$sh);
imagegif($sprite,$img);
imagedestroy($sprite);
imagedestroy($src);
$k ;
}
}
}
}
}
}

}

} } }

}

} }

}

}
}
} } } } } } } } } } } }} > ?>複製程式碼