一個很實用的類別,php調整gif圖片的尺寸！

} }

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

//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 "";
 for($i=0;$i echo str_pad(dechex(ord($ string[$i])),2,"0",STR_PAD_LEFT)。 ";
 }
 //--------------------------------------------- ----------- ----------- ----------
 private function debuglen($var,$len){
 echo "";
 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