php生成gif動畫的實作程式碼

/**
* 產生gif動畫的程式碼
* edit bbs.it-home.org
*/
class GifMerge {
var $ver = '1.1';
var $ dly = 50;
var $mod = 'C_FILE';
var $first = true;
var $use_loop = false;
var $transparent = false;
var $use_global_in = fsese ;
var $x = 0;
var $y = 0;
var $ch = 0;
var $fin = 0;
var $fout = '';
 var $loop = 0;
var $delay = 0;
var $width = 0;
var $height = 0;
var $trans1 = 255;
var $trans2 = 255 ;
var $trans3 = 255;
var $disposal = 2;
var $out_color_table_size = 0;
var $local_color_table_flag = 0;
var $global_color_table_color_table_flag = 0;
var $global_color_table_size; $out_color_table_sizecode = 0;
var $global_color_table_sizecode= 0;
var $gif = array(0x47, 0x49, 0x46);
var $buffer = array(); );
var $global_in = array();
var $global_out = array();
var $邏輯串口螢幕= array();
函數GifMerge($images, $t1, $ t2 , $t3, $loop, $dl, $xpos, $ypos, $model) {
if($model) {
$this->mod = $model;
}
 if ($loop > -1) {
$this->loop = Floor($loop - 1);
$this->use_loop = true;
}
if($t1 > - 1 && $t2 > -1 && $t3 > -1) {
$this->trans1 = $t1;
$this->trans2 = $t2;
$this->trans3 = $t3 ;
$this-> ;透明= true;
}
for($i = 0; $i $dl[$i] ? $this->delay = $dl[$i] : $this->delay = $this->dly;
$xpos[$i] ？ $this->x = $xpos[$i] : $this ->x = 0;
$ypos[$i] ? $this->y = $ypos[$i] : $this->y = 0;
$this->start_gifmerge_process($images[$i]);
}
$this ->fout .= "/x3b";
}
function start_gifmerge_process($fp) {
if($this->mod == 'C_FILE') {
if(!$ this->fin = fopen($fp, 'rb')) {
return;
}
} elseif($this->mod == 'C_MEMORY') {
$this ->ch = 0;
$this->fin = $fp;
}
$this->getbytes(6);
if(!$this->arrcmp( $this->buffer, $this->gif , 3)) {
return;
}
$this->getbytes(7);
if($this->;首先) $this->邏輯螢幕匯流排= $this- > buffer;
$this->global_color_table_sizecode = $this->buffer[4] & 0x07;
$this->global_color_table_size = 2 global_color_table_sizecode;if($ buffer[4] & 0x80) {
$this->getbytes((3 * $this->global_color_table_size));
 for($i = 0; $i  global_color_table_size )); $i++) {
$this->global_in[$i] = $this->buffer[$ i];
}
if($this->out_color_table_size == 0) {
$this->out_color_table_size = $this->global_color_table_size;
$out_color_table_sizecode = $this-> ;global_color_table_sizecode;
$this->glo_out = $this-bald_sizecode;
$this->glo_out = $this-bald_out = $this-balf; ($this->global_color_table_size != $this->out_color_table_size || $這個->; arcmp($this->global_out, $this->global_in, (3 * $this->global_color_table_size))) {
$this->use_global_in = true;
}
}
for( $loop = true; $loop;) {
$this->getbytes(1);
switch($this->buffer[0]) {
case 0x21:
$this-> read_extension();
break;
case 0x2c:
$this->read_image_descriptor();
break;
case 0x3b:
$loop = fbreakalse
case 0x3b:
$loop = f破>;
預設值：
$loop = false;
}
}
if($this->mod == 'C_FILE') {
 fclose($this->fin) ;
}
}
function read_image_descriptor() {
$this->getbytes(9);
$head = $this->;軸線;
$this-> local_color_table_flag->;軸線;
$this-> local_color_table_flag = ($this->buffer[8] & 0x80) ? true : false;
if($this->local_color_table_flag) {
$sizecode = $this->buffer[8] & 0x07;
$size = 2 $this ->getbytes(3 * $size);
for($i = 0; $i $this- >local_in[$i] = $this- >buffer[$i];
}
if($this->out_color_table_size == 0) {
$this->out_color_table_size = $size;
$out_color_table_sizecode = $sizecode;
 for($i = 0; $i {
$this->global_out[$ i] = $this->local_in[$i];
 }
}
}
if($this->first) {
$this->first = false;
$this->fout .= "/x47/x49/x46/x38/x39/x61" ;
if($this->寬度&& $this->高度) {
$this->邏輯螢幕描述符[0] = $this->寬度& 0xFF;
$this-> ;邏輯螢幕描述符[1] = ($this->寬度&0xFF00)>> 8;
$這->邏輯螢幕描述子[2] = $這->高度& 0xFF;
$這->邏輯螢幕描述符[3] = ($這->高度& 0xFF00)>>> ; 8;
}
$這->邏輯螢幕描述子[4] |= 0x80;
$這->邏輯螢幕描述子[5] &= 0xF0;
$這->邏輯螢幕描述子[6] |= $this->out_color_table_sizecode;
$this->putbytes($this->邏輯螢幕描述子, 7);
$this->putbytes($this->global_out, ($this- >out_color_table_size * 3));
if($this->use_loop) {
$ns[0] = 0x21;
$ns[1] = 0xFF;
$ns[2 ] = 0x0B;
$ns[3] = 0x4e;
$ns[4] = 0x45;
$ ns[5] = 0x54;
$ns[6] = 0x53;
$ns[7] = 0x43;
$ns[8] = 0x41;
$ns[9] = 0x50 ;
$ns[10] = 0x45;
$ns[11] = 0x32;
$ns[12] = 0x2e;
$ns[13] = 0x30;
$ns [14] = 0x03;
$ns[15] = 0x01;
 $ns[16] = $this->循環& 255;
$ns[17] = $this->循環>> > 8;
$ns[18] = 0x00;
$this->putbytes($ns, 19);
}
}
if($this->use_global_in) { }
if($this->use_global_in) {
$outtable = $this->global_in;
$outsize = $this->global_color_table_size;
$outsizecode = $this->global_color_table_sizecode;
} else {$. >global_out;
$outsize = $this->out_color_table_size;