<?php<zuojiazi.cn@gmail.com> <http://www.zjzit.cn>
class GIF{
private $frames = array();
private $delays = array();
public function __construct($src = null, $mod = 'url') {
if(!is_null($src)){
if('url' == $mod && is_file($src)){
$src = file_get_contents($src);
}
try{
$de = new GIFDecoder($src);
$this->frames = $de->GIFGetFrames();
$this->delays = $de->GIFGetDelays();
} catch(Exception $e){
throw new Exception("解码GIF图片出错");
}
}
}
public function image($stream = null){
if(is_null($stream)){
$current = current($this->frames);
return false === $current ? reset($this->frames) : $current;
} else {
$this->frames[key($this->frames)] = $stream;
}
}
public function nextImage(){
return next($this->frames);
}
public function save($gifname){
$gif = new GIFEncoder($this->frames, $this->delays, 0, 2, 0, 0, 0, 'bin');
file_put_contents($gifname, $gif->GetAnimation());
}
}
Class GIFEncoder {
var $GIF = "GIF89a";
var $VER = "GIFEncoder V2.05";
var $BUF = Array ( );
var $LOP = 0;
var $DIS = 2;
var $COL = -1;
var $IMG = -1;
var $ERR = Array (
'ERR00'=>"Does not supported function for only one image!",
'ERR01'=>"Source is not a GIF image!",
'ERR02'=>"Unintelligible flag ",
'ERR03'=>"Does not make animation from animated GIF source",
);
function GIFEncoder (
$GIF_src, $GIF_dly, $GIF_lop, $GIF_dis,
$GIF_red, $GIF_grn, $GIF_blu, $GIF_mod
) {
if ( ! is_array ( $GIF_src ) && ! is_array ( $GIF_tim ) ) {
printf ( "%s: %s", $this->VER, $this->ERR [ 'ERR00' ] );
exit ( 0 );
}
$this->LOP = ( $GIF_lop > -1 ) ? $GIF_lop : 0;
$this->DIS = ( $GIF_dis > -1 ) ? ( ( $GIF_dis < 3 ) ? $GIF_dis : 3 ) : 2;
$this->COL = ( $GIF_red > -1 && $GIF_grn > -1 && $GIF_blu > -1 ) ?
( $GIF_red | ( $GIF_grn << 8 ) | ( $GIF_blu << 16 ) ) : -1;
for ( $i = 0; $i < count ( $GIF_src ); $i++ ) {
if ( strToLower ( $GIF_mod ) == "url" ) {
$this->BUF [ ] = fread ( fopen ( $GIF_src [ $i ], "rb" ), filesize ( $GIF_src [ $i ] ) );
}
else if ( strToLower ( $GIF_mod ) == "bin" ) {
$this->BUF [ ] = $GIF_src [ $i ];
}
else {
printf ( "%s: %s ( %s )!", $this->VER, $this->ERR [ 'ERR02' ], $GIF_mod );
exit ( 0 );
}
if ( substr ( $this->BUF [ $i ], 0, 6 ) != "GIF87a" && substr ( $this->BUF [ $i ], 0, 6 ) != "GIF89a" ) {
printf ( "%s: %d %s", $this->VER, $i, $this->ERR [ 'ERR01' ] );
exit ( 0 );
}
for ( $j = ( 13 + 3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ) ), $k = TRUE; $k; $j++ ) {
switch ( $this->BUF [ $i ] { $j } ) {
case "!":
if ( ( substr ( $this->BUF [ $i ], ( $j + 3 ), 8 ) ) == "NETSCAPE" ) {
printf ( "%s: %s ( %s source )!", $this->VER, $this->ERR [ 'ERR03' ], ( $i + 1 ) );
exit ( 0 );
}
break;
case ";":
$k = FALSE;
break;
}
}
}
GIFEncoder::GIFAddHeader ( );
for ( $i = 0; $i < count ( $this->BUF ); $i++ ) {
GIFEncoder::GIFAddFrames ( $i, $GIF_dly [ $i ] );
}
GIFEncoder::GIFAddFooter ( );
}
function GIFAddHeader ( ) {
$cmap = 0;
if ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x80 ) {
$cmap = 3 * ( 2 << ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 ) );
$this->GIF .= substr ( $this->BUF [ 0 ], 6, 7 );
$this->GIF .= substr ( $this->BUF [ 0 ], 13, $cmap );
$this->GIF .= "!\377\13NETSCAPE2.0\3\1" . GIFEncoder::GIFWord ( $this->LOP ) . "\0";
}
}
function GIFAddFrames ( $i, $d ) {
$Locals_str = 13 + 3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) );
$Locals_end = strlen ( $this->BUF [ $i ] ) - $Locals_str - 1;
$Locals_tmp = substr ( $this->BUF [ $i ], $Locals_str, $Locals_end );
$Global_len = 2 << ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 );
$Locals_len = 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 );
$Global_rgb = substr ( $this->BUF [ 0 ], 13,
3 * ( 2 << ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 ) ) );
$Locals_rgb = substr ( $this->BUF [ $i ], 13,
3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ) );
$Locals_ext = "!\xF9\x04" . chr ( ( $this->DIS << 2 ) + 0 ) .
chr ( ( $d >> 0 ) & 0xFF ) . chr ( ( $d >> 8 ) & 0xFF ) . "\x0\x0";
if ( $this->COL > -1 && ord ( $this->BUF [ $i ] { 10 } ) & 0x80 ) {
for ( $j = 0; $j < ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ); $j++ ) {
if (
ord ( $Locals_rgb { 3 * $j + 0 } ) == ( ( $this->COL >> 16 ) & 0xFF ) &&
ord ( $Locals_rgb { 3 * $j + 1 } ) == ( ( $this->COL >> 8 ) & 0xFF ) &&
ord ( $Locals_rgb { 3 * $j + 2 } ) == ( ( $this->COL >> 0 ) & 0xFF )
) {
$Locals_ext = "!\xF9\x04" . chr ( ( $this->DIS << 2 ) + 1 ) .
chr ( ( $d >> 0 ) & 0xFF ) . chr ( ( $d >> 8 ) & 0xFF ) . chr ( $j ) . "\x0";
break;
}
}
}
switch ( $Locals_tmp { 0 } ) {
case "!":
$Locals_img = substr ( $Locals_tmp, 8, 10 );
$Locals_tmp = substr ( $Locals_tmp, 18, strlen ( $Locals_tmp ) - 18 );
break;
case ",":
$Locals_img = substr ( $Locals_tmp, 0, 10 );
$Locals_tmp = substr ( $Locals_tmp, 10, strlen ( $Locals_tmp ) - 10 );
break;
}
if ( ord ( $this->BUF [ $i ] { 10 } ) & 0x80 && $this->IMG > -1 ) {
if ( $Global_len == $Locals_len ) {
if ( GIFEncoder::GIFBlockCompare ( $Global_rgb, $Locals_rgb, $Global_len ) ) {
$this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp );
}
else {
$byte = ord ( $Locals_img { 9 } );
$byte |= 0x80;
$byte &= 0xF8;
$byte |= ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 );
$Locals_img { 9 } = chr ( $byte );
$this->GIF .= ( $Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp );
}
}
else {
$byte = ord ( $Locals_img { 9 } );
$byte |= 0x80;
$byte &= 0xF8;
$byte |= ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 );
$Locals_img { 9 } = chr ( $byte );
$this->GIF .= ( $Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp );
}
}
else {
$this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp );
}
$this->IMG = 1;
}
function GIFAddFooter ( ) {
$this->GIF .= ";";
}
function GIFBlockCompare ( $GlobalBlock, $LocalBlock, $Len ) {
for ( $i = 0; $i < $Len; $i++ ) {
if (
$GlobalBlock { 3 * $i + 0 } != $LocalBlock { 3 * $i + 0 } ||
$GlobalBlock { 3 * $i + 1 } != $LocalBlock { 3 * $i + 1 } ||
$GlobalBlock { 3 * $i + 2 } != $LocalBlock { 3 * $i + 2 }
) {
return ( 0 );
}
}
return ( 1 );
}
function GIFWord ( $int ) {
return ( chr ( $int & 0xFF ) . chr ( ( $int >> 8 ) & 0xFF ) );
}
function GetAnimation ( ) {
return ( $this->GIF );
}
}
Class GIFDecoder {
var $GIF_buffer = Array ( );
var $GIF_arrays = Array ( );
var $GIF_delays = Array ( );
var $GIF_stream = "";
var $GIF_string = "";
var $GIF_bfseek = 0;
var $GIF_screen = Array ( );
var $GIF_global = Array ( );
var $GIF_sorted;
var $GIF_colorS;
var $GIF_colorC;
var $GIF_colorF;
function GIFDecoder ( $GIF_pointer ) {
$this->GIF_stream = $GIF_pointer;
GIFDecoder::GIFGetByte ( 6 ); GIFDecoder::GIFGetByte ( 7 );
$this->GIF_screen = $this->GIF_buffer;
$this->GIF_colorF = $this->GIF_buffer [ 4 ] & 0x80 ? 1 : 0;
$this->GIF_sorted = $this->GIF_buffer [ 4 ] & 0x08 ? 1 : 0;
$this->GIF_colorC = $this->GIF_buffer [ 4 ] & 0x07;
$this->GIF_colorS = 2 << $this->GIF_colorC;
if ( $this->GIF_colorF == 1 ) {
GIFDecoder::GIFGetByte ( 3 * $this->GIF_colorS );
$this->GIF_global = $this->GIF_buffer;
}
for ( $cycle = 1; $cycle; ) {
if ( GIFDecoder::GIFGetByte ( 1 ) ) {
switch ( $this->GIF_buffer [ 0 ] ) {
case 0x21:
GIFDecoder::GIFReadExtensions ( );
break;
case 0x2C:
GIFDecoder::GIFReadDescriptor ( );
break;
case 0x3B:
$cycle = 0;
break;
}
}
else {
$cycle = 0;
}
}
}
function GIFReadExtensions ( ) {
GIFDecoder::GIFGetByte ( 1 );
for ( ; ; ) {
GIFDecoder::GIFGetByte ( 1 );
if ( ( $u = $this->GIF_buffer [ 0 ] ) == 0x00 ) {
break;
}
GIFDecoder::GIFGetByte ( $u );
if ( $u == 4 ) {
$this->GIF_delays [ ] = ( $this->GIF_buffer [ 1 ] | $this->GIF_buffer [ 2 ] << 8 );
}
}
}
function GIFReadDescriptor ( ) {
$GIF_screen = Array ( );
GIFDecoder::GIFGetByte ( 9 );
$GIF_screen = $this->GIF_buffer;
$GIF_colorF = $this->GIF_buffer [ 8 ] & 0x80 ? 1 : 0;
if ( $GIF_colorF ) {
$GIF_code = $this->GIF_buffer [ 8 ] & 0x07;
$GIF_sort = $this->GIF_buffer [ 8 ] & 0x20 ? 1 : 0;
}
else {
$GIF_code = $this->GIF_colorC;
$GIF_sort = $this->GIF_sorted;
}
$GIF_size = 2 << $GIF_code;
$this->GIF_screen [ 4 ] &= 0x70;
$this->GIF_screen [ 4 ] |= 0x80;
$this->GIF_screen [ 4 ] |= $GIF_code;
if ( $GIF_sort ) {
$this->GIF_screen [ 4 ] |= 0x08;
}
$this->GIF_string = "GIF87a";
GIFDecoder::GIFPutByte ( $this->GIF_screen );
if ( $GIF_colorF == 1 ) {
GIFDecoder::GIFGetByte ( 3 * $GIF_size );
GIFDecoder::GIFPutByte ( $this->GIF_buffer );
}
else {
GIFDecoder::GIFPutByte ( $this->GIF_global );
}
$this->GIF_string .= chr ( 0x2C );
$GIF_screen [ 8 ] &= 0x40;
GIFDecoder::GIFPutByte ( $GIF_screen );
GIFDecoder::GIFGetByte ( 1 );
GIFDecoder::GIFPutByte ( $this->GIF_buffer );
for ( ; ; ) {
GIFDecoder::GIFGetByte ( 1 );
GIFDecoder::GIFPutByte ( $this->GIF_buffer );
if ( ( $u = $this->GIF_buffer [ 0 ] ) == 0x00 ) {
break;
}
GIFDecoder::GIFGetByte ( $u );
GIFDecoder::GIFPutByte ( $this->GIF_buffer );
}
$this->GIF_string .= chr ( 0x3B );
$this->GIF_arrays [ ] = $this->GIF_string;
}
function GIFGetByte ( $len ) {
$this->GIF_buffer = Array ( );
for ( $i = 0; $i < $len; $i++ ) {
if ( $this->GIF_bfseek > strlen ( $this->GIF_stream ) ) {
return 0;
}
$this->GIF_buffer [ ] = ord ( $this->GIF_stream { $this->GIF_bfseek++ } );
}
return 1;
}
function GIFPutByte ( $bytes ) {
for ( $i = 0; $i < count ( $bytes ); $i++ ) {
$this->GIF_string .= chr ( $bytes [ $i ] );
}
}
function GIFGetFrames ( ) {
return ( $this->GIF_arrays );
}
function GIFGetDelays ( ) {
return ( $this->GIF_delays );
}
}