forked from Public/pics
384 lines
11 KiB
PHP
384 lines
11 KiB
PHP
<?php
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/*****************************************************************************
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* Image.php
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* Contains key class Image.
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*
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* Kabuki CMS (C) 2013-2015, Aaron van Geffen
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*****************************************************************************/
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class Image extends Asset
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{
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const TYPE_PANORAMA = 1;
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const TYPE_LANDSCAPE = 2;
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const TYPE_PORTRAIT = 4;
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protected function __construct(array $data)
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{
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foreach ($data as $attribute => $value)
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$this->$attribute = $value;
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}
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public static function fromId($id_asset, $return_format = 'object')
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{
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$asset = parent::fromId($id_asset, 'array');
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if ($asset)
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return $return_format == 'object' ? new Image($asset) : $asset;
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else
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return false;
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}
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public static function fromIds(array $id_assets, $return_format = 'object')
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{
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if (empty($id_assets))
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return [];
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$assets = parent::fromIds($id_assets, 'array');
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if ($return_format == 'array')
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return $assets;
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else
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{
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$objects = [];
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foreach ($assets as $id => $asset)
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$objects[$id] = new Image($asset);
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return $objects;
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}
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}
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public function save()
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{
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$data = [];
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foreach ($this->meta as $key => $value)
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$data[] = [
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'id_asset' => $this->id_asset,
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'variable' => $key,
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'value' => $value,
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];
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return Registry::get('db')->insert('replace', 'assets_meta', [
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'id_asset' => 'int',
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'variable' => 'string',
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'value' => 'string',
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], $data);
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}
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public function getExif()
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{
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return EXIF::fromFile($this->getPath());
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}
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public function getPath()
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{
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return ASSETSDIR . '/' . $this->subdir . '/' . $this->filename;
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}
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public function getUrl()
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{
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return ASSETSURL . '/' . $this->subdir . '/' . $this->filename;
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}
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/**
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* @param width: width of the thumbnail.
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* @param height: height of the thumbnail.
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* @param crop: whether and how to crop original image to fit. [false|true|'top'|'center'|'bottom']
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* @param fit: whether to fit the image to given boundaries [true], or use them merely as an estimation [false].
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*/
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public function getThumbnailUrl($width, $height, $crop = true, $fit = true)
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{
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// First, assert the image's dimensions are properly known in the database.
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if (!isset($this->image_height, $this->image_width))
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throw new UnexpectedValueException('Image width or height is undefined -- inconsistent database?');
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// Inferring width or height?
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if (!$height)
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$height = ceil($width / $this->image_width * $this->image_height);
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elseif (!$width)
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$width = ceil($height / $this->image_height * $this->image_width);
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// Inferring the height from the original image's ratio?
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if (!$fit)
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$height = floor($width / ($this->image_width / $this->image_height));
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// Assert we have both, now...
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if (empty($width) || empty($height))
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throw new InvalidArgumentException('Expecting at least either width or height as argument.');
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// If we're cropping, verify we're in the right mode.
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if ($crop)
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{
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// If the original image's aspect ratio is much wider, take a slice instead.
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if ($this->image_width / $this->image_height > $width / $height)
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$crop = 'slice';
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// We won't be cropping if the thumbnail is proportional to its original.
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if (abs($width / $height - $this->image_width / $this->image_height) <= 0.05)
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$crop = false;
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}
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// Do we have an exact crop boundary for these dimensions?
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$crop_selector = "crop_{$width}x{$height}";
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if (isset($this->meta[$crop_selector]))
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$crop = 'exact';
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// Now, do we need to suffix the filename?
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if ($crop)
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$suffix = '_c' . (is_string($crop) && $crop !== 'center' ? substr($crop, 0, 1) : '');
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else
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$suffix = '';
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// Check whether we already resized this earlier.
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$thumb_selector = "thumb_{$width}x{$height}{$suffix}";
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if (isset($this->meta[$thumb_selector]) && file_exists(THUMBSDIR . '/' . $this->subdir . '/' . $this->meta[$thumb_selector]))
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return THUMBSURL . '/' . $this->subdir . '/' . $this->meta[$thumb_selector];
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// Do we have a custom thumbnail on file?
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$custom_selector = "custom_{$width}x{$height}";
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if (isset($this->meta[$custom_selector]))
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{
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if (file_exists(ASSETSDIR . '/' . $this->subdir . '/' . $this->meta[$custom_selector]))
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{
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// Copy the custom thumbail to the general thumbnail directory.
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copy(ASSETSDIR . '/' . $this->subdir . '/' . $this->meta[$custom_selector],
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THUMBSDIR . '/' . $this->subdir . '/' . $this->meta[$custom_selector]);
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// Let's remember this for future reference.
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$this->meta[$thumb_selector] = $this->meta[$custom_selector];
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$this->save();
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return THUMBSURL . '/' . $this->subdir . '/' . $this->meta[$custom_selector];
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}
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else
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throw new UnexpectedValueException('Custom thumbnail expected, but missing in file system!');
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}
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// Let's try some arcane stuff...
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try
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{
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if (!class_exists('Imagick'))
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throw new Exception("The PHP module 'imagick' appears to be disabled. Please enable it to use image resampling functions.");
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$thumb = new Imagick(ASSETSDIR . '/' . $this->subdir . '/' . $this->filename);
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// The image might have some orientation set through EXIF. Let's apply this first.
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self::applyRotation($thumb);
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// Just resizing? Easy peasy.
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if (!$crop)
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$thumb->resizeImage($width, $height, Imagick::FILTER_LANCZOS, 1);
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// Cropping in the center?
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elseif ($crop === true || $crop === 'center')
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$thumb->cropThumbnailImage($width, $height);
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// Exact cropping? We can do that.
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elseif ($crop === 'exact')
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{
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list($crop_width, $crop_height, $crop_x_pos, $crop_y_pos) = explode(',', $this->meta[$crop_selector]);
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$thumb->cropImage($crop_width, $crop_height, $crop_x_pos, $crop_y_pos);
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$thumb->resizeImage($width, $height, Imagick::FILTER_LANCZOS, 1);
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}
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// Advanced cropping? Fun!
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else
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{
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$size = $thumb->getImageGeometry();
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// Taking a horizontal slice from the top or bottom of the original image?
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if ($crop === 'top' || $crop === 'bottom')
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{
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$crop_width = $size['width'];
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$crop_height = floor($size['width'] / $width * $height);
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$target_x = 0;
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$target_y = $crop === 'top' ? 0 : $size['height'] - $crop_height;
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}
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// Otherwise, we're taking a vertical slice from the centre.
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else
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{
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$crop_width = floor($size['height'] / $height * $width);
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$crop_height = $size['height'];
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$target_x = floor(($size['width'] - $crop_width) / 2);
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$target_y = 0;
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}
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$thumb->cropImage($crop_width, $crop_height, $target_x, $target_y);
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$thumb->resizeImage($width, $height, Imagick::FILTER_LANCZOS, 1);
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}
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// What sort of image is this? Fall back to PNG if we must.
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switch ($thumb->getImageFormat())
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{
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case 'JPEG':
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$ext = 'jpg';
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$thumb->setImageCompressionQuality(60);
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break;
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case 'GIF':
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$ext = 'gif';
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break;
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case 'PNG':
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default:
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$thumb->setFormat('PNG');
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$ext = 'png';
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break;
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}
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// So, how do we name this?
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$thumbfilename = substr($this->filename, 0, strrpos($this->filename, '.')) . "_{$width}x{$height}{$suffix}.$ext";
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// Ensure the thumbnail subdirectory exists.
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if (!is_dir(THUMBSDIR . '/' . $this->subdir))
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mkdir(THUMBSDIR . '/' . $this->subdir, 0755, true);
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// Save it in a public spot.
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$thumb->writeImage(THUMBSDIR . '/' . $this->subdir . '/' . $thumbfilename);
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$thumb->clear();
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$thumb->destroy();
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}
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// Blast! Curse your sudden but inevitable betrayal!
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catch (ImagickException $e)
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{
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throw new Exception('ImageMagick error occurred while generating thumbnail. Output: ' . $e->getMessage());
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}
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// Let's remember this for future reference.
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$this->meta[$thumb_selector] = $thumbfilename;
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$this->save();
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// Ah yes, you wanted a URL, didn't you...
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return THUMBSURL . '/' . $this->subdir . '/' . $this->meta[$thumb_selector];
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}
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private static function applyRotation(Imagick $image)
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{
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switch ($image->getImageOrientation())
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{
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// Clockwise rotation
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case Imagick::ORIENTATION_RIGHTTOP:
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$image->rotateImage("#000", 90);
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break;
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// Counter-clockwise rotation
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case Imagick::ORIENTATION_LEFTBOTTOM:
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$image->rotateImage("#000", 270);
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break;
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// Upside down?
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case Imagick::ORIENTATION_BOTTOMRIGHT:
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$image->rotateImage("#000", 180);
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}
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// Having rotated the image, make sure the EXIF data is set properly.
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$image->setImageOrientation(Imagick::ORIENTATION_TOPLEFT);
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}
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public function bestColor()
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{
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// Save some computations if we can.
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if (isset($this->meta['best_color']))
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return $this->meta['best_color'];
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// Find out what colour is most prominent.
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$color = new BestColor($this);
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$this->meta['best_color'] = $color->hex();
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$this->save();
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// There's your colour.
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return $this->meta['best_color'];
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}
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public function bestLabelColor()
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{
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// Save some computations if we can.
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if (isset($this->meta['best_color_label']))
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return $this->meta['best_color_label'];
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// Find out what colour is most prominent.
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$color = new BestColor($this);
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$this->meta['best_color_label'] = $color->rgba();
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$this->save();
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// There's your colour.
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return $this->meta['best_color_label'];
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}
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public function width()
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{
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return $this->image_width;
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}
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public function height()
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{
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return $this->image_height;
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}
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public function isPanorama()
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{
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return $this->image_width / $this->image_height > 2;
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}
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public function isPortrait()
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{
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return $this->image_width / $this->image_height < 1;
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}
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public function isLandscape()
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{
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$ratio = $this->image_width / $this->image_height;
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return $ratio >= 1 && $ratio <= 2;
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}
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public function removeAllThumbnails()
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{
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foreach ($this->meta as $key => $value)
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{
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if (substr($key, 0, 6) !== 'thumb_')
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continue;
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$thumb_path = THUMBSDIR . '/' . $this->subdir . '/' . $value;
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if (is_file($thumb_path))
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unlink($thumb_path);
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unset($this->meta[$key]);
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}
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$this->saveMetaData();
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}
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public function replaceThumbnail($descriptor, $tmp_file)
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{
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if (!is_file($tmp_file))
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return -1;
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if (!isset($this->meta[$descriptor]))
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return -2;
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$image = new Imagick($tmp_file);
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$d = $image->getImageGeometry();
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unset($image);
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// Check whether dimensions match.
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$test_descriptor = 'thumb_' . $d['width'] . 'x' . $d['height'];
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if ($descriptor !== $test_descriptor && strpos($descriptor, $test_descriptor . '_') === false)
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return -3;
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// Save the custom thumbnail in the assets directory.
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$destination = ASSETSDIR . '/' . $this->subdir . '/' . $this->meta[$descriptor];
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if (file_exists($destination) && !is_writable($destination))
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return -4;
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if (!copy($tmp_file, $destination))
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return -5;
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// Copy it to the thumbnail directory, overwriting the automatically generated one, too.
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$destination = THUMBSDIR . '/' . $this->subdir . '/' . $this->meta[$descriptor];
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if (file_exists($destination) && !is_writable($destination))
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return -6;
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if (!copy($tmp_file, $destination))
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return -7;
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// A little bookkeeping
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$this->meta['custom_' . $d['width'] . 'x' . $d['height']] = $this->meta[$descriptor];
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$this->saveMetaData();
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return 0;
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}
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}
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