PHP generated GIF animation implementation code

/** * Generate code for GIF animations * 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 = false; 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 $trans 1 = 255; var $trans 2 = 255; var $trans 3 = 255; var $disposal = 2; var $out _color_table_size = 0; var $local _color_table_flag = 0; var $global _color_table_size = 0; var $out _color_table_sizecode = 0; var $global _color_table_sizecode= 0; var $gif = Array (0x47, 0x49, 0x46); var $buffer = array (); var $local _in = Array (); var $global _in = Array (); var $global _out = Array (); var $logical _screen_descriptor = Array (); function Gifmerge ($images, $t 1, $t 2, $t 3, $loop, $DL, $xpos, $ypos, $model) { if ($model) { $this->mod = $model; } if ($loop >-1) { $this->loop = Floor ($loop-1); $this->use_loop = true; } if ($t 1 > 1 && $t 2 > 1 && $t 3 >-1) { $this->trans1 = $t 1; $this->trans2 = $t 2; $this->trans3 = $t 3; $this->transparent = true; } for ($i = 0; $i < count ($images); $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->first) $this->logical_screen_descriptor = $this->buffer; $this->global_color_table_sizecode = $this->buffer[4] & 0x07; $this->global_color_table_size = 2 << $this->global_color_table_sizecode; if ($this->buffer[4] & 0x80) { $this->getbytes ((3 * $this->global_color_table_size)); for ($i = 0; $i < ((3 * $this->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->global_out = $this->global_in; } if ($this->global_color_table_size! = $this->out_color_table_size | | $this->arrcmp ($this->global_out, $ This->global_in, (3 * $this->global_color_table_size))) { $this->use_global_in = true; } } for ($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 = false; Break Default $loop = false; } } if ($this->mod = = ' C_file ') { Fclose ($this->fin); } } function Read_image_descriptor () { $this->getbytes (9); $head = $this->buffer; $this->local_color_table_flag = ($this->buffer[8] & 0x80)? True:false; if ($this->local_color_table_flag) { $sizecode = $this->buffer[8] & 0x07; $size = 2 << $sizecode; $this->getbytes (3 * $size); for ($i = 0; $i < (3 * $size); $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 < (3 * $size); $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->width && $this->height) { $this->logical_screen_descriptor[0] = $this->width & 0xFF; $this->logical_screen_descriptor[1] = ($this->width & 0xff00) >> 8; $this->logical_screen_descriptor[2] = $this->height & 0xFF; $this->logical_screen_descriptor[3] = ($this->height & 0xff00) >> 8; } $this->logical_screen_descriptor[4] |= 0x80; $this->logical_screen_descriptor[5] &= 0xF0; $this->logical_screen_descriptor[6] |= $this->out_color_table_sizecode; $this->putbytes ($this->logical_screen_descriptor, 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 [Ten] = 0x45; $ns [One] = 0x32; $ns [n] = 0x2e; $ns [] = 0x30; $ns [] = 0x03; $ns [+] = 0x01; $ns [+] = $this->loop & 255; $ns [] = $this->loop >> 8; $ns [] = 0x00; $this->putbytes ($ns, 19); } } if ($this->use_global_in) { $outtable = $this->global_in; $outsize = $this->global_color_table_size; $outsizecode = $this->global_color_table_sizecode; } else { $outtable = $this->global_out; $outsize = $this->out_color_table_size; } if ($this->local_color_table_flag) { if ($size = = $this->out_color_table_size &&! $this->arrcmp ($this->local_in, $this->global_out, $ Size)) { $outtable = $global _out; $outsize = $this->out_color_table_size; } else { $outtable = $this->local_in; $outsize = $size; $outsizecode = $sizecode; } } $use _trans = false; if ($this->transparent) { for ($i = 0; $i < $outsize; $i + +) { if ($outtable [3 * $i] = = $this->trans1 && $outtable [3 * $i + 1] = = $this->trans2 && $outtable [3 * $ i + 2] = = $this->trans3) { Break } } if ($i < $outsize) { $transindex = $i; $use _trans = true; } } if ($this->delay | | $use _trans) { $this->buffer[0] = 0x21; $this->buffer[1] = 0xf9; $this->buffer[2] = 0x04; $this->buffer[3] = ($this->disposal << 2) + ($use _trans? 1:0); $this->buffer[4] = $this->delay & 0xff; $this->buffer[5] = ($this->delay & 0xff00) >> 8; $this->buffer[6] = $use _trans? $transindex: 0; $this->buffer[7] = 0x00; $this->putbytes ($this->buffer,8); } $this->buffer[0] = 0x2c; $this->putbytes ($this->buffer,1); $head [0] = $this->x & 0xff; $head [1] = ($this->x & 0xff00) >> 8; $head [2] = $this->y & 0xff; $head [3] = ($this->y & 0xff00) >> 8; $head [8] &= 0x40; if ($outtable! = $this->global_out) { $head [8] |= 0x80; $head [8] |= $outsizecode; } $this->putbytes ($head, 9); if ($outtable! = $this->global_out) { $this->putbytes ($outtable, (3 * $outsize)); } $this->getbytes (1); $this->putbytes ($this->buffer,1); for (;;) { $this->getbytes (1); $this->putbytes ($this->buffer,1); if ($u = $this->buffer[0]) = = 0) { Break } $this->getbytes ($u); $this->putbytes ($this->buffer, $u); } } function Read_extension () { $this->getbytes (1); Switch ($this->buffer[0]) { Case 0XF9: $this->getbytes (6); Break Case 0XFE: for (;;) { $this->getbytes (1); if ($u = $this->buffer[0]) = = 0) { Break } $this->getbytes ($u); } Break Case 0X01: $this->getbytes (13); for (;;) { $this->getbytes (0); if ($u = $this->buffer[0]) = = 0) { Break } $this->getbytes ($u); } Break Case 0xFF: $this->getbytes (9); $this->getbytes (3); for (;;) { $this->getbytes (1); if (! $this->buffer[0]) { Break } $this->getbytes ($this->buffer[0]); } Break Default for (;;) { $this->getbytes (1); if (! $this->buffer[0]) { Break } $this->getbytes ($this->buffer[0]); } } } function arrcmp ($b, $s, $l) { for ($i = 0; $i < $l; $i + +) { if ($s {$i}! = $b {$i}) { return false; } } return true; } function GetBytes ($l) { for ($i = 0; $i < $l; $i + +) { if ($this->mod = = ' C_file ') { $bin = Unpack (' c* ', fread ($this->fin, 1)); $this->buffer[$i] = $bin [1]; } elseif ($this->mod = = ' C_memory ') { $bin = Unpack (' c* ', substr ($this->fin, $this->ch, 1)); $this->buffer[$i] = $bin [1]; $this->ch++; } } return $this->buffer; } function putbytes ($s, $l) { for ($i = 0; $i < $l; $i + +) { $this->fout. = Pack (' c* ', $s [$i]); } } function Getanimation () { return $this->fout; } } ?> Copy Code

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