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<?php
/*
* Copyright 2014 Florian "Bluewind" Pritz <bluewind@server-speed.net>
*
* Licensed under AGPLv3
* (see COPYING for full license text)
*
*/
class Imglib {
/*
* This returns a square thumbnail for the input image
* Source: http://salman-w.blogspot.co.at/2009/04/crop-to-fit-image-using-aspphp.html
*/
public function makeThumb($file, $size = 150, $target_type = null)
{
$source_gdim = imagecreatefromstring(file_get_contents($file));
if ($source_gdim === false) {
show_error("Unsupported image type");
}
imagealphablending($source_gdim,false);
imagesavealpha($source_gdim,true);
list($source_width, $source_height, $source_type) = getimagesize($file);
if ($target_type === null) {
$target_type = $source_type;
}
$target_width = $size;
$target_height = $size;
$source_aspect_ratio = $source_width / $source_height;
$desired_aspect_ratio = $target_width / $target_height;
if ($source_aspect_ratio > $desired_aspect_ratio) {
// Triggered when source image is wider
$temp_height = $target_height;
$temp_width = round(($target_height * $source_aspect_ratio));
} else {
// Triggered otherwise (i.e. source image is similar or taller)
$temp_width = $target_width;
$temp_height = round(($target_width / $source_aspect_ratio));
}
/*
* Resize the image into a temporary GD image
*/
$temp_gdim = imagecreatetruecolor($temp_width, $temp_height);
imagealphablending($temp_gdim,false);
imagesavealpha($temp_gdim,true);
imagecopyresampled(
$temp_gdim,
$source_gdim,
0, 0,
0, 0,
$temp_width, $temp_height,
$source_width, $source_height
);
/*
* Copy cropped region from temporary image into the desired GD image
*/
$x0 = ($temp_width - $target_width) / 2;
$y0 = ($temp_height - $target_height) / 2;
$thumb = imagecreatetruecolor($target_width, $target_height);
imagealphablending($thumb,false);
imagesavealpha($thumb,true);
imagecopy(
$thumb,
$temp_gdim,
0, 0,
$x0, $y0,
$target_width, $target_height
);
/*
* Fix orientation according to exif tag
*/
try {
$exif = exif_read_data($file);
} catch (ErrorException $e) {
}
if (isset($exif['Orientation'])) {
$mirror = false;
$deg = 0;
switch ($exif['Orientation']) {
case 2:
$mirror = true;
break;
case 3:
$deg = 180;
break;
case 4:
$deg = 180;
$mirror = true;
break;
case 5:
$deg = 270;
$mirror = true;
break;
case 6:
$deg = 270;
break;
case 7:
$deg = 90;
$mirror = true;
break;
case 8:
$deg = 90;
break;
}
if ($deg) $thumb = imagerotate($thumb, $deg, 0);
if ($mirror) $thumb = $this->_mirrorImage($thumb);
}
ob_start();
switch ($target_type) {
case IMAGETYPE_GIF:
$ret = imagegif($thumb);
break;
case IMAGETYPE_JPEG:
$ret = imagejpeg($thumb);
break;
case IMAGETYPE_PNG:
$ret = imagepng($thumb);
break;
default:
assert(0);
}
$result = ob_get_clean();
if (!$ret) {
show_error("Failed to create thumbnail");
}
imagedestroy($thumb);
imagedestroy($temp_gdim);
imagedestroy($source_gdim);
return $result;
}
private function _mirrorImage($imgsrc)
{
$width = imagesx($imgsrc);
$height = imagesy($imgsrc);
$src_x = $width -1;
$src_y = 0;
$src_width = -$width;
$src_height = $height;
$imgdest = imagecreatetruecolor($width, $height);
imagealphablending($imgdest,false);
imagesavealpha($imgdest,true);
if (imagecopyresampled($imgdest, $imgsrc, 0, 0, $src_x, $src_y, $width, $height, $src_width, $src_height)) {
return $imgdest;
}
return $imgsrc;
}
}
|
