352 lines
10 KiB
PHP
352 lines
10 KiB
PHP
<?php namespace ProcessWire;
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/*
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:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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::
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:: GIFDecoder Version 2.0 by László Zsidi
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::
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:: Created at 2007. 02. 01. '07.47.AM'
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::
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:: Updated at 2009. 06. 23. '06.00.AM'
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::
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:: * Optimized version by xurei
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:: https://github.com/xurei/GIFDecoder_optimized
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:: Updated at 2015-04-13
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::
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:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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LICENSE:
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All versions specify Apache 2.0 license (2018-01-31):
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https://github.com/jacoka/GIFDecoder/blob/master/LICENSE
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https://github.com/xurei/GIFDecoder_optimized/blob/master/LICENSE
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Namespace added by Horst for ProcessWire
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*/
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class ISEAG_GIFDecoder {
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var $GIF_TransparentR = -1;
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var $GIF_TransparentG = -1;
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var $GIF_TransparentB = -1;
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var $GIF_TransparentI = 0;
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var $GIF_buffer = null;
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var $GIF_arrays = Array ( );
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var $GIF_delays = Array ( );
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var $GIF_dispos = Array ( );
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var $GIF_stream = "";
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var $GIF_string = "";
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var $GIF_bfseek = 0;
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var $GIF_anloop = 0;
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//xurei - frames metadata
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var $GIF_frames_meta = Array();
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var $GIF_screen = Array ( );
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var $GIF_global = Array ( ); //global color map
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var $GIF_sorted;
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var $GIF_colorS; //
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var $GIF_colorC; //Size of global color table
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var $GIF_colorF; //if 1, global color table follows image descriptor
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/*
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:::::::::::::::::::::::::::::::::::::::::::::::::::
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::
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:: GIFDecoder ( $GIF_pointer )
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::
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*/
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function __construct ( $GIF_pointer ) {
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$this->GIF_stream = $GIF_pointer;
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ISEAG_GIFDecoder::GIFGetByte ( 6 );
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ISEAG_GIFDecoder::GIFGetByte ( 7 );
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$this->GIF_screen = $this->GIF_buffer;
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$this->GIF_colorF = $this->GIF_buffer [ 4 ] & 0x80 ? 1 : 0;
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$this->GIF_sorted = $this->GIF_buffer [ 4 ] & 0x08 ? 1 : 0;
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$this->GIF_colorC = $this->GIF_buffer [ 4 ] & 0x07;
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$this->GIF_colorS = 2 << $this->GIF_colorC;
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if ( $this->GIF_colorF == 1 ) {
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ISEAG_GIFDecoder::GIFGetByte ( 3 * $this->GIF_colorS );
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$this->GIF_global = $this->GIF_buffer;
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}
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for ( $cycle = 1; $cycle; ) {
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if ( ISEAG_GIFDecoder::GIFGetByte ( 1 ) ) {
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switch ( $this->GIF_buffer [ 0 ] ) {
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case 0x21:
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ISEAG_GIFDecoder::GIFReadExtensions ( );
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break;
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case 0x2C:
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ISEAG_GIFDecoder::GIFReadDescriptor ( );
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break;
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case 0x3B:
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$cycle = 0;
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break;
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}
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}
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else {
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$cycle = 0;
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}
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}
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}
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/*
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:::::::::::::::::::::::::::::::::::::::::::::::::::
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::
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:: GIFReadExtension ( )
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::
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*/
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function GIFReadExtensions ( ) {
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ISEAG_GIFDecoder::GIFGetByte ( 1 );
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if ( $this->GIF_buffer [ 0 ] == 0xff ) {
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for ( ; ; ) {
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ISEAG_GIFDecoder::GIFGetByte ( 1 );
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if ( ( $u = $this->GIF_buffer [ 0 ] ) == 0x00 ) {
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break;
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}
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ISEAG_GIFDecoder::GIFGetByte ( $u );
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if ( $u == 0x03 ) {
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$this->GIF_anloop = ( $this->GIF_buffer [ 1 ] | $this->GIF_buffer [ 2 ] << 8 );
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}
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}
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}
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else {
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for ( ; ; ) {
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ISEAG_GIFDecoder::GIFGetByte ( 1 );
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if ( ( $u = $this->GIF_buffer [ 0 ] ) == 0x00 ) {
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break;
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}
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ISEAG_GIFDecoder::GIFGetByte ( $u );
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if ( $u == 0x04 ) {
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$buf4 = count($this->GIF_buffer) >= 5 ? $this->GIF_buffer [ 4 ] : 0;
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if ( $buf4 & 0x80 ) {
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$this->GIF_dispos [ ] = ( $this->GIF_buffer [ 0 ] >> 2 ) - 1;
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}
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else {
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$this->GIF_dispos [ ] = ( $this->GIF_buffer [ 0 ] >> 2 ) - 0;
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}
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$this->GIF_delays [ ] = ( $this->GIF_buffer [ 1 ] | $this->GIF_buffer [ 2 ] << 8 );
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if ( $this->GIF_buffer [ 3 ] ) {
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$this->GIF_TransparentI = $this->GIF_buffer [ 3 ];
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}
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}
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}
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}
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}
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/*
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:::::::::::::::::::::::::::::::::::::::::::::::::::
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::
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:: GIFReadDescriptor ( )
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::
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*/
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function GIFReadDescriptor ( ) {
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$GIF_screen = Array ( );
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ISEAG_GIFDecoder::GIFGetByte ( 9 );
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//xurei - metadata saving
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$this->GIF_frames_meta[] = array(
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'left'=>$this->GIF_buffer[0] + ($this->GIF_buffer[1] << 8),
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'top'=>$this->GIF_buffer[2] + ($this->GIF_buffer[3] << 8),
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'width'=>$this->GIF_buffer[4] + ($this->GIF_buffer[5] << 8),
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'height'=>$this->GIF_buffer[6] + ($this->GIF_buffer[7] << 8),
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);
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$GIF_screen = $this->GIF_buffer;
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$GIF_colorF = $this->GIF_buffer [ 8 ] & 0x80 ? 1 : 0;
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if ( $GIF_colorF ) {
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$GIF_code = $this->GIF_buffer [ 8 ] & 0x07;
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$GIF_sort = $this->GIF_buffer [ 8 ] & 0x20 ? 1 : 0;
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}
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else {
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$GIF_code = $this->GIF_colorC;
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$GIF_sort = $this->GIF_sorted;
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}
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$GIF_size = 2 << $GIF_code;
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$this->GIF_screen [ 4 ] &= 0x70;
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$this->GIF_screen [ 4 ] |= 0x80;
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$this->GIF_screen [ 4 ] |= $GIF_code;
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if ( $GIF_sort ) {
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$this->GIF_screen [ 4 ] |= 0x08;
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}
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/*
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*
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* GIF Data Begin
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*
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*/
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if ( $this->GIF_TransparentI ) {
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$this->GIF_string = "GIF89a";
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}
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else {
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$this->GIF_string = "GIF87a";
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}
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ISEAG_GIFDecoder::GIFPutByte ( $this->GIF_screen );
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if ( $GIF_colorF == 1 ) {
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ISEAG_GIFDecoder::GIFGetByte ( 3 * $GIF_size );
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if ( $this->GIF_TransparentI ) {
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$this->GIF_TransparentR = $this->GIF_buffer [ 3 * $this->GIF_TransparentI + 0 ];
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$this->GIF_TransparentG = $this->GIF_buffer [ 3 * $this->GIF_TransparentI + 1 ];
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$this->GIF_TransparentB = $this->GIF_buffer [ 3 * $this->GIF_TransparentI + 2 ];
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}
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ISEAG_GIFDecoder::GIFPutByte ( $this->GIF_buffer );
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}
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else {
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if ( $this->GIF_TransparentI ) {
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$this->GIF_TransparentR = $this->GIF_global [ 3 * $this->GIF_TransparentI + 0 ];
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$this->GIF_TransparentG = $this->GIF_global [ 3 * $this->GIF_TransparentI + 1 ];
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$this->GIF_TransparentB = $this->GIF_global [ 3 * $this->GIF_TransparentI + 2 ];
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}
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ISEAG_GIFDecoder::GIFPutByte ( $this->GIF_global );
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}
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if ( $this->GIF_TransparentI ) {
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$this->GIF_string .= "!\xF9\x04\x1\x0\x0". chr ( $this->GIF_TransparentI ) . "\x0";
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}
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$this->GIF_string .= chr ( 0x2C );
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$GIF_screen [ 8 ] &= 0x40;
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ISEAG_GIFDecoder::GIFPutByte ( $GIF_screen );
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ISEAG_GIFDecoder::GIFGetByte ( 1 );
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ISEAG_GIFDecoder::GIFPutByte ( $this->GIF_buffer );
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for ( ; ; ) {
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ISEAG_GIFDecoder::GIFGetByte ( 1 );
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ISEAG_GIFDecoder::GIFPutByte ( $this->GIF_buffer );
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if ( ( $u = $this->GIF_buffer [ 0 ] ) == 0x00 ) {
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break;
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}
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/*for ($i=0; $i!=$u; ++$i)
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{
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$this->GIF_string .= $this->GIF_stream { $this->GIF_bfseek++ };
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}*/
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$this->GIF_string .= substr($this->GIF_stream, $this->GIF_bfseek, $u);
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$this->GIF_bfseek += $u;
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//GIFDecoder::GIFGetByte ( $u );
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//GIFDecoder::GIFPutByte ( $this->GIF_buffer );
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}
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$this->GIF_string .= chr ( 0x3B );
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/*
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*
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* GIF Data End
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*
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*/
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$this->GIF_arrays [ ] = $this->GIF_string;
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}
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/*
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:::::::::::::::::::::::::::::::::::::::::::::::::::
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::
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:: GIFGetByte ( $len )
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::
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*/
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function GIFGetByte ( $len ) {
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$this->GIF_buffer = new \SplFixedArray($len);
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$l = strlen ( $this->GIF_stream );
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for ( $i = 0; $i < $len; $i++ ) {
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if ( $this->GIF_bfseek > $l ) {
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$this->GIF_buffer->setSize($i);
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return 0;
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}
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$this->GIF_buffer [$i] = ord ( $this->GIF_stream [ $this->GIF_bfseek++ ] );
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}
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return 1;
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}
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/*
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:::::::::::::::::::::::::::::::::::::::::::::::::::
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::
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:: GIFPutByte ( $bytes )
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::
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*/
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function GIFPutByte ( $bytes ) {
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$out = '';
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foreach ( $bytes as $byte ) {
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$out .= chr($byte);
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}
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$this->GIF_string .= $out;
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}
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/*
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:::::::::::::::::::::::::::::::::::::::::::::::::::
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::
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:: PUBLIC FUNCTIONS
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::
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::
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:: GIFGetFrames ( )
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::
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*/
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function GIFGetFrames ( ) {
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return ( $this->GIF_arrays );
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}
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/*
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:::::::::::::::::::::::::::::::::::::::::::::::::::
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::
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:: GIFGetFramesMeta ( )
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::
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:: xurei - returns metadata as an array of arrays
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*/
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function GIFGetFramesMeta ( ) {
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return ( $this->GIF_frames_meta );
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}
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/*
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:::::::::::::::::::::::::::::::::::::::::::::::::::
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::
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:: GIFGetDelays ( )
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::
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*/
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function GIFGetDelays ( ) {
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return ( $this->GIF_delays );
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}
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/*
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:::::::::::::::::::::::::::::::::::::::::::::::::::
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::
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:: GIFGetLoop ( )
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::
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*/
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function GIFGetLoop ( ) {
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return ( $this->GIF_anloop );
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}
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/*
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:::::::::::::::::::::::::::::::::::::::::::::::::::
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::
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:: GIFGetDisposal ( )
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::
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*/
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function GIFGetDisposal ( ) {
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return ( $this->GIF_dispos );
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}
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/*
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:::::::::::::::::::::::::::::::::::::::::::::::::::
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::
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:: GIFGetTransparentR ( )
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::
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*/
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function GIFGetTransparentR ( ) {
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return ( $this->GIF_TransparentR );
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}
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/*
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:::::::::::::::::::::::::::::::::::::::::::::::::::
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::
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:: GIFGetTransparentG ( )
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::
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*/
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function GIFGetTransparentG ( ) {
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return ( $this->GIF_TransparentG );
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}
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/*
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:::::::::::::::::::::::::::::::::::::::::::::::::::
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::
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:: GIFGetTransparentB ( )
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::
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*/
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function GIFGetTransparentB ( ) {
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return ( $this->GIF_TransparentB );
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}
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/*
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:::::::::::::::::::::::::::::::::::::::::::::::::::
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::
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:: GIFGetTransparentI ( )
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::
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*/
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function GIFGetTransparentI ( ) {
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return ( $this->GIF_TransparentI );
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}
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}
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