328 lines
8.5 KiB
PHP
328 lines
8.5 KiB
PHP
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<?php
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/**
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* [Discuz!] (C)2001-2099 Comsenz Inc.
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* This is NOT a freeware, use is subject to license terms
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*
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* $Id: class_gifmerge.php 15494 2010-08-24 08:16:39Z liulanbo $
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*/
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if(!defined('IN_DISCUZ')) {
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exit('Access Denied');
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}
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class GifMerge {
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var $ver = '1.1';
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var $dly = 50;
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var $mod = 'C_FILE';
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var $first = true;
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var $use_loop = false;
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var $transparent = false;
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var $use_global_in = false;
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var $x = 0;
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var $y = 0;
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var $ch = 0;
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var $fin = 0;
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var $fout = '';
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var $loop = 0;
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var $delay = 0;
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var $width = 0;
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var $height = 0;
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var $trans1 = 255;
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var $trans2 = 255;
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var $trans3 = 255;
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var $disposal = 2;
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var $out_color_table_size = 0;
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var $local_color_table_flag = 0;
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var $global_color_table_size = 0;
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var $out_color_table_sizecode = 0;
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var $global_color_table_sizecode= 0;
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var $gif = array(0x47, 0x49, 0x46);
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var $buffer = array();
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var $local_in = array();
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var $global_in = array();
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var $global_out = array();
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var $logical_screen_descriptor = array();
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function GifMerge($images, $t1, $t2, $t3, $loop, $dl, $xpos, $ypos, $model) {
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if($model) {
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$this->mod = $model;
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}
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if($loop > -1) {
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$this->loop = floor($loop - 1);
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$this->use_loop = true;
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}
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if($t1 > -1 && $t2 > -1 && $t3 > -1) {
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$this->trans1 = $t1;
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$this->trans2 = $t2;
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$this->trans3 = $t3;
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$this->transparent = true;
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}
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for($i = 0; $i < count($images); $i++) {
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$dl[$i] ? $this->delay = $dl[$i] : $this->delay = $this->dly;
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$xpos[$i] ? $this->x = $xpos[$i] : $this->x = 0;
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$ypos[$i] ? $this->y = $ypos[$i] : $this->y = 0;
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$this->start_gifmerge_process($images[$i]);
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}
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$this->fout .= "\x3b";
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}
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function start_gifmerge_process($fp) {
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if($this->mod == 'C_FILE') {
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if(!$this->fin = fopen($fp, 'rb')) {
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return;
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}
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} elseif($this->mod == 'C_MEMORY') {
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$this->ch = 0;
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$this->fin = $fp;
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}
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$this->getbytes(6);
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if(!$this->arrcmp($this->buffer, $this->gif, 3)) {
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return;
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}
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$this->getbytes(7);
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if($this->first) $this->logical_screen_descriptor = $this->buffer;
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$this->global_color_table_sizecode = $this->buffer[4] & 0x07;
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$this->global_color_table_size = 2 << $this->global_color_table_sizecode;
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if($this->buffer[4] & 0x80) {
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$this->getbytes((3 * $this->global_color_table_size));
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for($i = 0; $i < ((3 * $this->global_color_table_size)); $i++) {
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$this->global_in[$i] = $this->buffer[$i];
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}
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if($this->out_color_table_size == 0) {
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$this->out_color_table_size = $this->global_color_table_size;
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$this->out_color_table_sizecode = $this->global_color_table_sizecode;
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$this->global_out = $this->global_in;
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}
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if($this->global_color_table_size != $this->out_color_table_size || $this->arrcmp($this->global_out, $this->global_in, (3 * $this->global_color_table_size))) {
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$this->use_global_in = true;
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}
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}
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for($loop = true; $loop;) {
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$this->getbytes(1);
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switch($this->buffer[0]) {
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case 0x21:
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$this->read_extension();
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break;
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case 0x2c:
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$this->read_image_descriptor();
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break;
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case 0x3b:
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$loop = false;
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break;
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default:
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$loop = false;
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}
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}
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if($this->mod == 'C_FILE') {
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fclose($this->fin);
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}
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}
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function read_image_descriptor() {
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$this->getbytes(9);
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$head = $this->buffer;
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$this->local_color_table_flag = ($this->buffer[8] & 0x80) ? true : false;
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if($this->local_color_table_flag) {
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$sizecode = $this->buffer[8] & 0x07;
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$size = 2 << $sizecode;
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$this->getbytes(3 * $size);
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for($i = 0; $i < (3 * $size); $i++) {
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$this->local_in[$i] = $this->buffer[$i];
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}
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if($this->out_color_table_size == 0) {
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$this->out_color_table_size = $size;
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$this->out_color_table_sizecode = $sizecode;
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for($i = 0; $i < (3 * $size); $i++) {
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$this->global_out[$i] = $this->local_in[$i];
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}
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}
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}
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if($this->first) {
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$this->first = false;
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$this->fout .= "\x47\x49\x46\x38\x39\x61";
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if($this->width && $this->height) {
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$this->logical_screen_descriptor[0] = $this->width & 0xFF;
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$this->logical_screen_descriptor[1] = ($this->width & 0xFF00) >> 8;
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$this->logical_screen_descriptor[2] = $this->height & 0xFF;
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$this->logical_screen_descriptor[3] = ($this->height & 0xFF00) >> 8;
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}
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$this->logical_screen_descriptor[4] |= 0x80;
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$this->logical_screen_descriptor[5] &= 0xF0;
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$this->logical_screen_descriptor[6] |= $this->out_color_table_sizecode;
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$this->putbytes($this->logical_screen_descriptor, 7);
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$this->putbytes($this->global_out, ($this->out_color_table_size * 3));
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if($this->use_loop) {
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$ns[0] = 0x21;
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$ns[1] = 0xFF;
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$ns[2] = 0x0B;
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$ns[3] = 0x4e;
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$ns[4] = 0x45;
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$ns[5] = 0x54;
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$ns[6] = 0x53;
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$ns[7] = 0x43;
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$ns[8] = 0x41;
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$ns[9] = 0x50;
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$ns[10] = 0x45;
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$ns[11] = 0x32;
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$ns[12] = 0x2e;
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$ns[13] = 0x30;
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$ns[14] = 0x03;
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$ns[15] = 0x01;
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$ns[16] = $this->loop & 255;
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$ns[17] = $this->loop >> 8;
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$ns[18] = 0x00;
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$this->putbytes($ns, 19);
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}
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}
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if($this->use_global_in) {
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$outtable = $this->global_in;
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$outsize = $this->global_color_table_size;
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$outsizecode = $this->global_color_table_sizecode;
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} else {
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$outtable = $this->global_out;
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$outsize = $this->out_color_table_size;
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}
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if($this->local_color_table_flag) {
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if($size == $this->out_color_table_size && !$this->arrcmp($this->local_in, $this->global_out, $size)) {
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$outtable = $this->global_out;
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$outsize = $this->out_color_table_size;
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} else {
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$outtable = $this->local_in;
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$outsize = $size;
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$outsizecode = $sizecode;
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}
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}
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$use_trans = false;
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if($this->transparent) {
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for($i = 0; $i < $outsize; $i++) {
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if($outtable[3 * $i] == $this->trans1 && $outtable [3 * $i + 1] == $this->trans2 && $outtable [3 * $i + 2] == $this->trans3) {
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break;
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}
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}
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if($i < $outsize) {
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$transindex = $i;
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$use_trans = true;
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}
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}
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if($this->delay || $use_trans) {
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$this->buffer[0] = 0x21;
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$this->buffer[1] = 0xf9;
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$this->buffer[2] = 0x04;
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$this->buffer[3] = ($this->disposal << 2) + ($use_trans ? 1 : 0);
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$this->buffer[4] = $this->delay & 0xff;
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$this->buffer[5] = ($this->delay & 0xff00) >> 8;
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$this->buffer[6] = $use_trans ? $transindex : 0;
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$this->buffer[7] = 0x00;
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$this->putbytes($this->buffer,8);
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}
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$this->buffer[0] = 0x2c;
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$this->putbytes($this->buffer,1);
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$head[0] = $this->x & 0xff;
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$head[1] = ($this->x & 0xff00) >> 8;
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$head[2] = $this->y & 0xff;
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$head[3] = ($this->y & 0xff00) >> 8;
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$head[8] &= 0x40;
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if($outtable != $this->global_out) {
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$head[8] |= 0x80;
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$head[8] |= $outsizecode;
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}
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$this->putbytes($head,9);
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if($outtable != $this->global_out) {
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$this->putbytes($outtable, (3 * $outsize));
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}
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$this->getbytes(1);
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$this->putbytes($this->buffer,1);
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for(;;) {
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$this->getbytes(1);
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$this->putbytes($this->buffer,1);
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if(($u = $this->buffer[0]) == 0) {
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break;
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}
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$this->getbytes($u);
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$this->putbytes($this->buffer, $u);
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}
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}
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function read_extension() {
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$this->getbytes(1);
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switch($this->buffer[0]) {
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case 0xf9:
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$this->getbytes(6);
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break;
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case 0xfe:
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for(;;) {
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$this->getbytes(1);
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if(($u = $this->buffer[0]) == 0) {
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break;
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}
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$this->getbytes($u);
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}
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break;
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case 0x01:
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$this->getbytes(13);
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for(;;) {
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$this->getbytes(0);
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if(($u = $this->buffer[0]) == 0) {
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break;
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}
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$this->getbytes($u);
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}
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break;
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case 0xff:
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$this->getbytes(9);
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$this->getbytes(3);
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for(;;) {
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$this->getbytes(1);
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if(!$this->buffer[0]) {
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break;
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}
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$this->getbytes($this->buffer[0]);
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}
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break;
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default:
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for(;;) {
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$this->getbytes(1);
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if(!$this->buffer[0]) {
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break;
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}
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$this->getbytes($this->buffer[0]);
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}
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}
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}
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function arrcmp($b, $s, $l) {
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for($i = 0; $i < $l; $i++) {
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if($s{$i} != $b{$i}) {
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return false;
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}
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}
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return true;
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}
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function getbytes($l) {
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for($i = 0; $i < $l; $i++) {
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if($this->mod == 'C_FILE') {
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$bin = unpack('C*', fread($this->fin, 1));
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$this->buffer[$i] = $bin[1];
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} elseif($this->mod == 'C_MEMORY') {
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$bin = unpack('C*', substr($this->fin, $this->ch, 1));
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$this->buffer[$i] = $bin[1];
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$this->ch++;
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}
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}
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return $this->buffer;
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}
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function putbytes($s, $l) {
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for($i = 0; $i < $l; $i++) {
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$this->fout .= pack('C*', $s[$i]);
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}
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}
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function getAnimation() {
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return $this->fout;
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}
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}
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?>
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