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.Clas s.php
[code=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=>"Unintel ligible 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::GI FHead ( );
for ( $i = 0; $i < count ( $this->BUF ); $i++ ) {
GIFAnimator::GI FGetFrames ( $i, $GIF_dly [ $i ] );
}
GIFAnimator::GI FFoot ( );
}

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\13NETSCA PE2.0\3\1" . GIFAnimator::GI FWord ( $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::GI FBlock ( $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 );
}
}

?>
[/code]

then to produce the image from frames:

gif.php
[code=php]
<?php

include "GifEncoder.Cla ss.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 ( );



?>
[/code]

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)

[code=php]
$image = imagecreate(600 ,240);
$black = imagecoloralloc ate($image, 0, 0, 0);
imagefill($imag e, 0, 0, $black);


imagecopymerge( $image, $gif->GetAnimation() , 300, 100, 0, 0, 15, 15, 100);

header("content-type: image/gif");
Imagegif($image );
imagedestroy($i mage);

[/code]

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::$G IF is a string, rather than an image resource.

Try using imagecreatefrom string().

[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:
[code=php]
foreach( $frames as $name = $thePfhrame )
{
$imgPfhrame = imagecreatefrom string($thePfhr ame);
imagecopymerge( $image, $imgPfhrame, 300, 100, 0, 0, 15, 15, 100);
imagegif($image , "frames/{$name}");
}
[/code]

Then reload and import the frames into the GIFAnimator class.

[helraizer1]

Hey pbmods!

I have used

[PHP]<?php

include('gif.ph p');

$image = imagecreatefrom png("../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 )

{

$imgPfhrame = imagecreatefrom gif($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($lin e, ":roll:")) {
session_registe r("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($_SES SION['roll'])) {
header("Content-Type: image/png"); // tell the browser what we're gonna give it
imagepng($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 )

{

$imgPfhrame = imagecreatefrom gif($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:

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

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.