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<?php
namespace Zotlabs\Photo;
/**
* @brief GD photo driver.
*
*/
class PhotoGd extends PhotoDriver {
/**
* {@inheritDoc}
* @see \Zotlabs\Photo\PhotoDriver::supportedTypes()
*/
public function supportedTypes() {
$t = [];
$t['image/jpeg'] = 'jpg';
if(imagetypes() & IMG_PNG)
$t['image/png'] = 'png';
if(imagetypes() & IMG_GIF)
$t['image/gif'] = 'gif';
return $t;
}
protected function load($data, $type) {
$this->valid = false;
if(! $data)
return;
$this->image = @imagecreatefromstring($data);
if($this->image !== false) {
$this->valid = true;
$this->setDimensions();
imagealphablending($this->image, false);
imagesavealpha($this->image, true);
}
}
protected function setDimensions() {
$this->width = imagesx($this->image);
$this->height = imagesy($this->image);
}
/**
* @brief GD driver does not preserve EXIF, so not need to clear it.
*
* @return void
*/
public function clearexif() {
return;
}
protected function destroy() {
if($this->is_valid()) {
imagedestroy($this->image);
}
}
/**
* @brief Return a PHP image resource of the current image.
*
* @see \Zotlabs\Photo\PhotoDriver::getImage()
*
* @return boolean|resource
*/
public function getImage() {
if(! $this->is_valid())
return false;
return $this->image;
}
public function doScaleImage($dest_width, $dest_height) {
$dest = imagecreatetruecolor($dest_width, $dest_height);
$width = imagesx($this->image);
$height = imagesy($this->image);
imagealphablending($dest, false);
imagesavealpha($dest, true);
if($this->type == 'image/png')
imagefill($dest, 0, 0, imagecolorallocatealpha($dest, 0, 0, 0, 127)); // fill with alpha
imagecopyresampled($dest, $this->image, 0, 0, 0, 0, $dest_width, $dest_height, $width, $height);
if($this->image)
imagedestroy($this->image);
$this->image = $dest;
$this->setDimensions();
}
public function rotate($degrees) {
if(! $this->is_valid())
return false;
$this->image = imagerotate($this->image, $degrees, 0);
$this->setDimensions();
}
public function flip($horiz = true, $vert = false) {
if(! $this->is_valid())
return false;
$w = imagesx($this->image);
$h = imagesy($this->image);
$flipped = imagecreate($w, $h);
if($horiz) {
for($x = 0; $x < $w; $x++) {
imagecopy($flipped, $this->image, $x, 0, $w - $x - 1, 0, 1, $h);
}
}
if($vert) {
for($y = 0; $y < $h; $y++) {
imagecopy($flipped, $this->image, 0, $y, 0, $h - $y - 1, $w, 1);
}
}
$this->image = $flipped;
$this->setDimensions(); // Shouldn't really be necessary
}
public function cropImageRect($maxx, $maxy, $x, $y, $w, $h) {
if(! $this->is_valid())
return false;
$dest = imagecreatetruecolor($maxx, $maxy);
imagealphablending($dest, false);
imagesavealpha($dest, true);
if($this->type == 'image/png')
imagefill($dest, 0, 0, imagecolorallocatealpha($dest, 0, 0, 0, 127)); // fill with alpha
imagecopyresampled($dest, $this->image, 0, 0, $x, $y, $maxx, $maxy, $w, $h);
if($this->image)
imagedestroy($this->image);
$this->image = $dest;
$this->setDimensions();
}
/**
* {@inheritDoc}
* @see \Zotlabs\Photo\PhotoDriver::imageString()
*/
public function imageString() {
if(! $this->is_valid())
return false;
$quality = false;
ob_start();
switch($this->getType()){
case 'image/png':
$quality = get_config('system', 'png_quality');
if((! $quality) || ($quality > 9))
$quality = PNG_QUALITY;
\imagepng($this->image, NULL, $quality);
break;
case 'image/jpeg':
// gd can lack imagejpeg(), but we verify during installation it is available
default:
$quality = get_config('system', 'jpeg_quality');
if((! $quality) || ($quality > 100))
$quality = JPEG_QUALITY;
\imagejpeg($this->image, NULL, $quality);
break;
}
$string = ob_get_contents();
ob_end_clean();
return $string;
}
}
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