Gif image with random text in each frame

patawic · February 13, 2010

I have all of my functions. but it appears that the functions i am using does not like using php generated images for its gif animation.

Heres my text.php works perfectly fine

<?
$codelenght = 10;
while($newcode_length < $codelenght) {
$x=1;
$y=3;
$part = rand($x,$y);
if($part==1){$a=48;$b=57;}  // Numbers
if($part==2){$a=65;$b=90;}  // UpperCase
if($part==3){$a=97;$b=122;} // LowerCase
$code_part=chr(rand($a,$b));
$newcode_length = $newcode_length + 1;
$newcode = $newcode.$code_part;
}
$my_img = imagecreate(200, 80);
$background = imagecolorallocate( $my_img, 0, 0, 255);
$text_colour = imagecolorallocate( $my_img, 255, 255, 0);
$line_colour = imagecolorallocate( $my_img, 128, 255, 0 );
imagestring($my_img, 4, 30, 25, "$newcode", $text_colour);
imagesetthickness ($my_img, 5);
imageline($my_img, 30, 45, 165, 45, $line_colour);
header("Content-type: image/gif");
imagegif( $my_img );
imagedestroy($my_img);
?>

Heres my index.php

<?php
include "GIFEncoder.class.php";
$images = array("text.php" , "text.php");
$speed = "15";
$gif = new GIFEncoder($images, $speed, 0, 2, 0, 0, 0, "url");
Header ( 'Content-type:image/gif' );
echo	$gif->GetAnimation ( );
?>

Heres my GIFEncoder.class.php

<?php
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
::
::	GIFEncoder Version 2.0 by László Zsidi, http://gifs.hu
::
::	This class is a rewritten 'GifMerge.class.php' version.
::
::  Modification:
::   - Simplified and easy code,
::   - Ultra fast encoding,
::   - Built-in errors,
::   - Stable working
::
::
::	Updated at 2007. 02. 13. '00.05.AM'
::
::
::
::  Try on-line GIFBuilder Form demo based on GIFEncoder.
::
::  http://gifs.hu/phpclasses/demos/GifBuilder/
::
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
*/

Class GIFEncoder {
var $GIF = "GIF89a";		/* GIF header 6 bytes	*/
var $VER = "GIFEncoder V2.05";	/* Encoder version		*/

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",
);

/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
::	GIFEncoder...
::
*/
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 ( );
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
::	GIFAddHeader...
::
*/
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";
	}
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
::	GIFAddFrames...
::
*/
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;
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
::	GIFAddFooter...
::
*/
function GIFAddFooter ( ) {
	$this->GIF .= ";";
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
::	GIFBlockCompare...
::
*/
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 );
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
::	GIFWord...
::
*/
function GIFWord ( $int ) {

	return ( chr ( $int & 0xFF ) . chr ( ( $int >> 8 ) & 0xFF ) );
}
/*
:::::::::::::::::::::::::::::::::::::::::::::::::::
::
::	GetAnimation...
::
*/
function GetAnimation ( ) {
	return ( $this->GIF );
}
}
?>

Any help would be gladly appreciated

trq · February 13, 2010

You haven't exactly described any problem.

patawic · February 13, 2010

oops sorry XD. it says this when i load index.php "GIFEncoder V2.05: 0 Source is not a GIF image!"

trq · February 13, 2010

You might need to hack the class itself.

Where it has....

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 );
}

Change it too....

die(substr ( $this->BUF [ $i ], 0, 6 ));
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 );
}

And let us know what it says.

patawic · February 13, 2010

if i replace the code with yours. i just get a blank screen

and if i view teh source of the page it says has

<?
$c

and thats it :/

trq · February 13, 2010

Your using short open tags within text.php, don't.

patawic · February 13, 2010

short open tags wont make any difference will they?

trq · February 13, 2010

may i ask what a short open tag is?

<?

You should always use....

<?php

patawic · February 13, 2010

realised that after i posted :/. still doesnt fix my problem though :/

trq · February 13, 2010

So... what have you done to debug the problem? Have you tried executing the changes I made?

patawic · February 13, 2010

when i executed your code it gave me a blank screen

trq · February 13, 2010

Well your going to need to keep debugging it until you find what causes that if statement to return true.

patawic · February 13, 2010

i still cant get it to work :/

trq · February 13, 2010

i still cant get it to work :/

What steps have you taken to debug the problem?

patawic · February 13, 2010

all i know is that its something to do with the header of the gif image that text.php is generating

trq · February 13, 2010

One more time. What steps have you taken to debug the problem?

patawic · February 14, 2010

Help guys. its something to do with the generated images header, as the part of code that displays the error checks to see if the header is correct or not.

patawic · February 14, 2010

thorpe i dont know how i can debug the problem. if i edit the header of a proper gif image, it starts giving the error. so the text.php is generating false .gif images

patawic · February 16, 2010

Bump

patawic · February 17, 2010

bump

patawic · February 18, 2010

bump..... help guys

trq · February 18, 2010

You could keep bumping for days or let us know what effort you have made to solve the problem.

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Gif image with random text in each frame

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