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zotlabs
2017-11-19 16:56:59 -08:00
parent 60fcb5f4f2
commit 16f584608f
7 changed files with 159 additions and 59 deletions
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127
include/photo/photo_driver.php
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@@ -241,69 +241,84 @@ abstract class photo_driver {
}
/**
* @brief reads exif data from filename
*/
public function exif($filename) {
public function orient($filename) {
if((! function_exists('exif_read_data'))
|| (! in_array($this->getType(), [ 'image/jpeg' , 'image/tiff'] ))) {
return false;
}
/**
* This function is a bit unusual, because it is operating on a file, but you must
* first create an image from that file to initialise the type and check validity
* of the image.
/*
* PHP 7.2 allows you to use a stream resource, which should reduce/avoid
* memory exhaustion on large images.
*/
if(! $this->is_valid())
return false;
if((! function_exists('exif_read_data')) || ($this->getType() !== 'image/jpeg'))
return false;
$exif = @exif_read_data($filename,null,true);
if($exif) {
$ort = $exif['IFD0']['Orientation'];
switch($ort)
{
case 1: // nothing
break;
case 2: // horizontal flip
$this->flip();
break;
case 3: // 180 rotate left
$this->rotate(180);
break;
case 4: // vertical flip
$this->flip(false, true);
break;
case 5: // vertical flip + 90 rotate right
$this->flip(false, true);
$this->rotate(-90);
break;
case 6: // 90 rotate right
$this->rotate(-90);
break;
case 7: // horizontal flip + 90 rotate right
$this->flip();
$this->rotate(-90);
break;
case 8: // 90 rotate left
$this->rotate(90);
break;
}
return $exif;
if(version_compare(PHP_VERSION,'7.2.0') >= 0) {
$f = @fopen($filename,'rb');
}
else {
$f = $filename;
}
return false;
if($f) {
return @exif_read_data($f);
}
return false;
}
/**
* @brief orients current image based on exif orientation information
*/
public function orient($exif) {
if(! ($this->is_valid() && $exif)) {
return false;
}
$ort = $exif['IFD0']['Orientation'];
if(! $ort) {
return false;
}
switch($ort) {
case 1: // nothing
break;
case 2: // horizontal flip
$this->flip();
break;
case 3: // 180 rotate left
$this->rotate(180);
break;
case 4: // vertical flip
$this->flip(false, true);
break;
case 5: // vertical flip + 90 rotate right
$this->flip(false, true);
$this->rotate(-90);
break;
case 6: // 90 rotate right
$this->rotate(-90);
break;
case 7: // horizontal flip + 90 rotate right
$this->flip();
$this->rotate(-90);
break;
case 8: // 90 rotate left
$this->rotate(90);
break;
default:
break;
}
return true;
}