Animating gifs through PHP GD - treat as Image not Object?

[helraizer1]

Me again :D You're going to be sick of me soon. =P

I found the GifEncoder class on phpclasses, which creates an animated gif image from frames and echos it to the browser to show; can also save it as an image with .gif extension.

The only problem is that I need to add the animated gif onto another image (with imagecopymerge), however the gif image that is returned by this code in an object.

Here is the code:

GifEncoder.Class.php

<?php
 
 
Class GIFAnimator {
    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 GIFAnimator    (
                            $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;
                }
            }
        }
        GIFAnimator::GIFHead ( );
        for ( $i = 0; $i < count ( $this->BUF ); $i++ ) {
            GIFAnimator::GIFGetFrames ( $i, $GIF_dly [ $i ] );
        }
        GIFAnimator::GIFFoot ( );
    }
 
    function GIFHead ( ) {
        $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" . GIFAnimator::GIFWord ( $this->LOP ) . "\0";
        }
    }
 
    function GIFGetFrames ( $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 ( GIFAnimator::GIFBlock ( $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 GIFFoot ( ) {
        $this->GIF .= ";";
    }
 
    function GIFBlock ( $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 );
    }
} 
 
?>
 

then to produce the image from frames:

gif.php

<?php
 
include "GifEncoder.Class.php";
 
if ( $dh = opendir ( "frames/" ) ) {
    while ( false !== ( $dat = readdir ( $dh ) ) ) {
        if ( $dat != "." && $dat != ".." ) {
            $frames [ ] = "frames/$dat";
            $framed [ ] = 20;
        }
    }
    closedir ( $dh );
}
 
$gif = new GIFAnimator    (
                            $frames, //sources - URL or path
                            $framed, //delay times - int
                            0, //Animation loops - int - 0 is infinite
                            2, //Disposal - int
                            -1, -1, -1, //transparency red, green, blue - int 
                            "url" // source type
        );
 
        header("Content-Type: image/gif");
echo $gif->GetAnimation ( );
 
 
 
?> 
 

Is there any way that I can use or manipulate this code to produce a valid gif image from it could be used in the imagecopymerge function?

I tried adding this $gif->GetAnimation() to the imagecopymerge like this: (just to try something; not that it'd work)

$image = imagecreate(600,240);
$black = imagecolorallocate($image, 0, 0, 0);
imagefill($image, 0, 0, $black);
 
 
imagecopymerge($image, $gif->GetAnimation(), 300, 100, 0, 0, 15, 15, 100);
 
header("content-type: image/gif");
Imagegif($image);
imagedestroy($image);
 
 

and got this error

Warning: imagecopymerge(): supplied argument is not a valid Image resource in /home/sites/helraizer.co.uk/public_html/ocr/animation.php on line 31

any ideas?

Sam

[pbmods]

Heya, Sam.

I think GIFAnimator::$GIF is a string, rather than an image resource.

Try using imagecreatefromstring().

[helraizer1]

Hey, pbmods

$im = imagecreatefromstring($gif->GIF);
 
imagecopymerge($image, $im, 300, 100, 0, 0, 15, 15, 100);
 

That works, only once it's merged onto the image, it's no longer animated. xD

Is there any way to actuall merge an animated gif onto a static gif image?

Sam

[pbmods]

Hm. It sounds like what you'll need to do is to composite each frame individually.

In other words:

foreach( $frames as $name = $thePfhrame )
{
    $imgPfhrame = imagecreatefromstring($thePfhrame);
    imagecopymerge($image, $imgPfhrame, 300, 100, 0, 0, 15, 15, 100);
    imagegif($image, "frames/{$name}");
}
 

Then reload and import the frames into the GIFAnimator class.

[helraizer1]

Hey pbmods!

I have used

[PHP]<?php

include('gif.php');

$image = imagecreatefrompng("../mychatbox/user/helraizer1.png");


if ( $dh = opendir ( "frames/" ) ) {

while ( false !== ( $dat = readdir ( $dh ) ) ) {

if ( $dat != "." && $dat != ".." ) {

$frames [ ] .= "frames/$dat";

$framed [ ] = 20;

}

}

closedir ( $dh );

}

foreach( $frames as $thePfhrame )

{

$imgPfhrame = imagecreatefromgif($thePfhrame);

imagecopymerge($image, $imgPfhrame, imageSX($image)/2, imageSY($image)/1.5, 0, 0, 15, 15, 100);




}


$gif = new GIFAnimator (

$frames, //sources - URL or path

$framed, //delay times - int

0, //Animation loops - int - 0 is infinite

2, //Disposal - int

-1, -1, -1, //transparency red, green, blue - int

"url" // source type

);






header("Content-Type: image/gif");

echo $gif->GetAnimation();


FWrite ( FOpen ( "img.gif", "wb" ), $gif->GetAnimation ( ) );


?> [/PHP]

and it produces this:

or

As you can see the one that is in middle is animated! So that works perfectly fine, on its own.

However when I put the code in my showimage script (to produce the shoutbox), which is in a different folder, but still has a 'frames' folder with the same frames in it, it gives me the error.

GIFEncoder V2.05: Does not supported function for only one image!

Even though there are 9 frames in the folder.

[PHP]
if(stristr($line, ":roll:")) {
session_register("roll");
$_SESSION['roll'] = 1;
}

if (isset($filter)) {
header("Content-Type: image/png"); // tell the browser what we're gonna give it
imagepng($image);

} elseif ($page == 1) {

if(!isset($_SESSION['roll'])) {
header("Content-Type: image/png"); // tell the browser what we're gonna give it
imagepng($image);
imagepng($image, "./user/" . $user . $box. ".png");

} else {

$pos = strpos($line, ":roll:");

if ($font == "palab") {
$post = $pos * 5.7;
} elseif ($font == "comicsans") {
$post = $pos * 6.725;
} elseif ($font == "calibri") {
$post = $pos * 5;
} elseif ($font == "courbd") {
$post = ($pos * 5.8) + 1;
} elseif ($font == "arial") {
$post = ($pos * 7.3) + 1;
} else {

}



if ( $dh = opendir ( "frames/" ) ) {

while ( false !== ( $dat = readdir ( $dh ) ) ) {

if ( $dat != "." && $dat != ".." ) {

$frames [ ] .= "frames/$dat";

$framed [ ] = 17;

}

}

closedir ( $dh );

}

foreach( $frames as $thePfhrame )

{

$imgPfhrame = imagecreatefromgif($thePfhrame);

imagecopymerge($image, $imgPfhrame, ($cur_line_x + $post) + 6, (($cur_line_y + $lineheight) - 30.5), 0, 0, 15, 15, 100);




}


$gif = new GIFAnimator (

$frames, //sources - URL or path

$framed, //delay times - int

0, //Animation loops - int - 0 is infinite

2, //Disposal - int

-1, -1, -1, //transparency red, green, blue - int

"url" // source type

);






header("Content-Type: image/gif");

echo $gif->GetAnimation();


FWrite ( FOpen ( "helraizer2.gif", "wb" ), $gif->GetAnimation ( ) );

}


else {
header("Content-Type: image/png"); // tell the browser what we're gonna give it
imagepng($image);

}
[/PHP]

Any idea why this happens?

Sam

[pbmods]

From line 26 in the code listing in your first post:

if ( ! is_array ( $GIF_src ) && ! is_array ( $GIF_tim ) ) {
            printf    ( "%s: %s", $this->VER, $this->ERR [ 'ERR00' ] );
            exit    ( 0 );
        }
 

I'll spare you some needless vgrepping; ERR00 is 'Does not supported (sic) function for only one image!'.

$GIF_tim doesn't seem to exist, so I'm a little confused by that (it also might be the source of the problem you're hitting).

I'd also confirm that $frames that you're passing to GIFAnimator's constructor on line 69 of your previous post is an array.