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Added fixOrientation method which rotates the image based on EXIF data.

This commit is contained in:
Thomas Tanghus 2012-01-05 17:42:40 +01:00
parent d80b477ab5
commit 2f86a6203a
1 changed files with 82 additions and 2 deletions
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84
lib/image.php
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@ -42,8 +42,7 @@ function ellipsis($str, $maxlen) {
}
/**
* Class for image manipulation
* Ideas: imagerotate, chunk_split(base64_encode())
* Class for basic image manipulation
*
*/
class OC_Image {
@ -200,6 +199,87 @@ class OC_Image {
return chunk_split(base64_encode(ob_get_clean()));
}
/**
* @brief Fixes orientation based on EXIF data.
* @returns bool.
*/
public function fixOrientation() {
if(!is_resource(self::$resource)) {
OC_Log::write('core','OC_Image::fixOrientation() No image loaded.', OC_Log::DEBUG);
return false;
}
if(is_null(self::$filepath) || !is_readable(self::$filepath)) {
OC_Log::write('core','OC_Image::fixOrientation() No readable file path set.', OC_Log::DEBUG);
return false;
}
$exif = exif_read_data(self::$filepath, 'IFD0');
if(!$exif) {
return false;
}
if(!isset($exif['Orientation'])) {
return true; // Nothing to fix
}
$o = $exif['Orientation'];
OC_Log::write('core','OC_Image::fixOrientation() Orientation: '.$o, OC_Log::DEBUG);
$rotate = 0;
$flip = false;
switch($o) {
case 1:
$rotate = 0;
$flip = false;
break;
case 2: // Not tested
$rotate = 0;
$flip = true;
break;
case 3:
$rotate = 180;
$flip = false;
break;
case 4: // Not tested
$rotate = 180;
$flip = true;
break;
case 5: // Not tested
$rotate = 90;
$flip = true;
break;
case 6:
//$rotate = 90;
$rotate = 270;
$flip = false;
break;
case 7: // Not tested
$rotate = 270;
$flip = true;
break;
case 8:
$rotate = 270;
$flip = false;
break;
}
if($rotate) {
$res = imagerotate(self::$resource, $rotate, -1);
if($res) {
if(imagealphablending($res, true)) {
if(imagesavealpha($res, true)) {
self::$resource = $res;
return true;
} else {
OC_Log::write('core','OC_Image::fixOrientation() Error during alphasaving.', OC_Log::DEBUG);
return false;
}
} else {
OC_Log::write('core','OC_Image::fixOrientation() Error during alphablending.', OC_Log::DEBUG);
return false;
}
} else {
OC_Log::write('core','OC_Image::fixOrientation() Error during oriention fixing.', OC_Log::DEBUG);
return false;
}
}
}
/**
* @brief Loads an image from a local file, a base64 encoded string or a resource created by an imagecreate* function.
* @param $imageref The path to a local file, a base64 encoded string or a resource created by an imagecreate* function.