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fix gifs with smaller frames #8

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fix gifs with smaller frames #8

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42 changes: 22 additions & 20 deletions src/GifFrameExtractor/GifFrameExtractor.php
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
<?php

namespace GifFrameExtractor;
namespace GifFrameExtractor;

/**
* Extract the frames (and their duration) of a GIF
Expand Down Expand Up @@ -122,7 +122,7 @@ class GifFrameExtractor
public function extract($filename, $originalFrames = false)
{
if (!self::isAnimatedGif($filename)) {
throw new \Exception('The GIF image you are trying to explode is not animated !');
throw new \Exception('The GIF image you are trying to explode is not animated !');
}

$this->reset();
Expand All @@ -141,30 +141,32 @@ public function extract($filename, $originalFrames = false)
if ($i > 0) {

$prevImg = $this->frames[$i - 1]['image'];
$sprite = imagecreate($this->gifMaxWidth, $this->gifMaxHeight);
imagesavealpha($sprite, true);

} else {
$transparent = imagecolortransparent($prevImg);

$prevImg = $img;
}

$sprite = imagecreate($this->gifMaxWidth, $this->gifMaxHeight);
imagesavealpha($sprite, true);

$transparent = imagecolortransparent($prevImg);

if ($transparent > -1 && imagecolorstotal($prevImg) > $transparent) {
if ($transparent > -1 && imagecolorstotal($prevImg) > $transparent) {

$actualTrans = imagecolorsforindex($prevImg, $transparent);
imagecolortransparent($sprite, imagecolorallocate($sprite, $actualTrans['red'], $actualTrans['green'], $actualTrans['blue']));
}

$actualTrans = imagecolorsforindex($prevImg, $transparent);
imagecolortransparent($sprite, imagecolorallocate($sprite, $actualTrans['red'], $actualTrans['green'], $actualTrans['blue']));
}

if ((int) $this->frameSources[$i]['disposal_method'] == 1 && $i > 0) {
if ((int) $this->frameSources[$i]['disposal_method'] == 1 && $i > 0) {

imagecopy($sprite, $prevImg, 0, 0, 0, 0, $this->gifMaxWidth, $this->gifMaxHeight);
}
$w = imagesx($img);
$h = imagesy($img);
imagecopyresampled($sprite, $img, $this->frameSources[$i]["offset_left"], $this->frameSources[$i]["offset_top"], 0, 0, $w, $h, $w, $h);
$img = $sprite;

} else {

imagecopy($sprite, $prevImg, 0, 0, 0, 0, $this->gifMaxWidth, $this->gifMaxHeight);
$prevImg = $img;
}

imagecopyresampled($sprite, $img, $this->frameSources[$i]["offset_left"], $this->frameSources[$i]["offset_top"], 0, 0, $this->gifMaxWidth, $this->gifMaxHeight, $this->gifMaxWidth, $this->gifMaxHeight);
$img = $sprite;

}

$this->frameImages[$i] = $this->frames[$i]['image'] = $img;
Expand Down