Merge pull request 'Add double-density support to photo thumbnails' (#28) from improve_thumbs into master

Reviewed-on: Public/pics#28

models/Database.php

@@ -488,7 +488,7 @@ class Database
 	/**
 	 * This function can be used to insert data into the database in a secure way.
 	 */
-	public function insert($method = 'replace', $table, $columns, $data)
+	public function insert($method, $table, $columns, $data)
 	{
 		// With nothing to insert, simply return.
 		if (empty($data))

models/GenericTable.php

@@ -43,7 +43,7 @@ class GenericTable
 		$this->start = empty($options['start']) || !is_numeric($options['start']) || $options['start'] < 0 || $options['start'] > $this->recordCount ? 0 : $options['start'];
 
 		// Figure out where we are on the whole, too.
-		$numPages = ceil($this->recordCount / $this->items_per_page);
+		$numPages = max(1, ceil($this->recordCount / $this->items_per_page));
 		$this->currentPage = min(ceil($this->start / $this->items_per_page) + 1, $numPages);
 
 		// Let's bear a few things in mind...
@@ -234,7 +234,9 @@ class GenericTable
 				else
 					$pattern = $options['data']['pattern'];
 
-				if (!is_numeric($rowData[$options['data']['timestamp']]))
+				if (!isset($rowData[$options['data']['timestamp']]))
+					$timestamp = 0;
+				elseif (!is_numeric($rowData[$options['data']['timestamp']]))
 					$timestamp = strtotime($rowData[$options['data']['timestamp']]);
 				else
 					$timestamp = (int) $rowData[$options['data']['timestamp']];

models/Image.php

@@ -67,14 +67,33 @@ class Image extends Asset
 		return EXIF::fromFile($this->getPath());
 	}
 
-	public function getPath()
+	public function getImageUrls($width = null, $height = null)
 	{
-		return ASSETSDIR . '/' . $this->subdir . '/' . $this->filename;
+		$image_urls = [];
+		if (isset($width) || isset($height))
+		{
+			$thumbnail = new Thumbnail($this);
+			$image_urls[1] = $this->getThumbnailUrl($width, $height, false);
+
+			// Can we afford to generate double-density thumbnails as well?
+			if ((!isset($width) || $this->image_width >= $width * 2) &&
+				(!isset($height) || $this->image_height >= $height * 2))
+				$image_urls[2] = $this->getThumbnailUrl($width * 2, $height * 2, false);
+			else
+				$image_urls[2] = $this->getThumbnailUrl($this->image_width, $this->image_height, true);
+		}
+		else
+			$image_urls[1] = $this->getUrl();
+
+		return $image_urls;
 	}
 
-	public function getUrl()
+	public function getInlineImage($width = null, $height = null, $className = 'inline-image')
 	{
-		return ASSETSURL . '/' . $this->subdir . '/' . $this->filename;
+		$image_urls = $this->getImageUrls($width, $height);
+
+		return '<img class="' . $className . '" src="' . $image_urls[1] . '" alt=""' .
+			(isset($image_urls[2]) ? ' srcset="' . $image_urls[2] . ' 2x"' : '') . '>';
 	}
 
 	/**
@@ -141,7 +160,8 @@ class Image extends Asset
 		}
 
 		return Registry::get('db')->query('
-			DELETE FROM assets_thumbs
+			UPDATE assets_thumbs
+			SET filename = NULL
 			WHERE id_asset = {int:id_asset}',
 			['id_asset' => $this->id_asset]);
 	}

models/PageIndex.php

@@ -63,9 +63,9 @@ class PageIndex
 			   lower     current/cont. pgs.       center            upper
 		*/
 
-		$this->num_pages = ceil($this->recordCount / $this->items_per_page);
+		$this->num_pages = max(1, ceil($this->recordCount / $this->items_per_page));
 		$this->current_page = min(ceil($this->start / $this->items_per_page) + 1, $this->num_pages);
-		if ($this->num_pages == 0)
+		if ($this->num_pages <= 1)
 		{
 			$this->needsPageIndex = false;
 			return;

models/Thumbnail.php

@@ -9,6 +9,7 @@
 class Thumbnail
 {
 	private $image;
+	private $image_meta;
 	private $thumbnails;
 
 	private $properly_initialised;
@@ -23,7 +24,7 @@ class Thumbnail
 	const CROP_MODE_SLICE_CENTRE = 4;
 	const CROP_MODE_SLICE_BOTTOM = 5;
 
-	public function __construct($image)
+	public function __construct(Image $image)
 	{
 		$this->image      = $image;
 		$this->image_meta = $image->getMeta();
@@ -45,51 +46,45 @@ class Thumbnail
 		$thumb_selector = $this->width . 'x' . $this->height . $this->filename_suffix;
 		if (!empty($this->thumbnails[$thumb_selector]))
 		{
-			$thumb_path = '/' . $this->image->getSubdir() . '/' . $this->thumbnails[$thumb_selector];
+			$thumb_filename = $this->image->getSubdir() . '/' . $this->thumbnails[$thumb_selector];
-			if (file_exists(THUMBSDIR . $thumb_path))
+			if (file_exists(THUMBSDIR . '/' . $thumb_filename))
-				return THUMBSURL . $thumb_path;
+				return THUMBSURL . '/' . $thumb_filename;
 		}
 
 		// Do we have a custom thumbnail on file?
 		$custom_selector = 'custom_' . $this->width . 'x' . $this->height;
 		if (isset($this->image_meta[$custom_selector]))
 		{
-			$custom_thumb_path = '/' . $this->image->getSubdir() . '/' . $this->image_meta[$custom_selector];
+			$custom_filename = $this->image->getSubdir() . '/' . $this->image_meta[$custom_selector];
-			if (file_exists(ASSETSDIR . $custom_thumb_path))
+			if (file_exists(ASSETSDIR . '/' . $custom_filename))
 			{
-				// Ensure destination thumbnail directory exists.
-				if (!file_exists($this->image->getSubdir()))
-					@mkdir(THUMBSDIR . '/' . $this->image->getSubdir(), 0755, true);
-
 				// Copy the custom thumbail to the general thumbnail directory.
-				copy(ASSETSDIR . $custom_thumb_path, THUMBSDIR . $custom_thumb_path);
+				copy(ASSETSDIR . '/' . $custom_filename, THUMBSDIR . '/' . $custom_filename);
 
 				// Let's remember this for future reference.
 				$this->markAsGenerated($this->image_meta[$custom_selector]);
 
-				return THUMBSURL . $custom_thumb_path;
+				return THUMBSURL . '/' . $custom_filename;
 			}
 			else
 				throw new UnexpectedValueException('Custom thumbnail expected, but missing in file system!');
 		}
 
 		// Is this the right moment to generate a thumbnail, then?
-		if ($generate && array_key_exists($thumb_selector, $this->thumbnails))
+		if ($generate)
 		{
-			return $this->generate();
+			if (array_key_exists($thumb_selector, $this->thumbnails))
+				return $this->generate();
+			else
+				throw new Exception("Trying to generate a thumbnail not previously queued by the system\n" .
+					print_r(func_get_args(), true));
 		}
 
 		// If not, queue it for generation at another time, and return a URL to generate it with.
-		elseif (!$generate)
-		{
-			$this->markAsQueued();
-			return BASEURL . '/thumbnail/' . $this->image->getId() . '/' . $this->width . 'x' . $this->height . $this->filename_suffix . '/';
-		}
-
-		// Still here..? What are you up to? ..Sneaking?
 		else
 		{
-			throw new Exception("Trying to generate a thumbnail for selector " . $thumb_selector . ", which does not appear to have been requested by the system.\n" . print_r(func_get_args(), true));
+			$this->markAsQueued();
+			return BASEURL . '/thumbnail/' . $this->image->getId() . '/' . $thumb_selector . '/';
 		}
 	}
 
@@ -260,14 +255,18 @@ class Thumbnail
 				'_' . $this->width . 'x' . $this->height . $this->filename_suffix . '.' . $ext;
 
 			// Ensure the thumbnail subdirectory exists.
-			if (!is_dir(THUMBSDIR . '/' . $this->image->getSubdir()))
+			$target_dir = THUMBSDIR . '/' . $this->image->getSubdir();
-				mkdir(THUMBSDIR . '/' . $this->image->getSubdir(), 0755, true);
+			if (!is_dir($target_dir))
+				mkdir($target_dir, 0755, true);
+
+			if (!is_writable($target_dir))
+				throw new Exception('Thumbnail directory is not writable!');
 
 			// No need to preserve every detail.
 			$thumb->setImageCompressionQuality(80);
 
 			// Save it in a public spot.
-			$thumb->writeImage(THUMBSDIR . '/' . $this->image->getSubdir() . '/' . $thumb_filename);
+			$thumb->writeImage($target_dir . '/' . $thumb_filename);
 
 			// Let's remember this for future reference...
 			$this->markAsGenerated($thumb_filename);
@@ -278,7 +277,6 @@ class Thumbnail
 			// Finally, return the URL for the generated thumbnail image.
 			return THUMBSURL . '/' . $this->image->getSubdir() . '/' . $thumb_filename;
 		}
-		// Blast! Curse your sudden but inevitable betrayal!
 		catch (ImagickException $e)
 		{
 			throw new Exception('ImageMagick error occurred while generating thumbnail. Output: ' . $e->getMessage());
@@ -336,10 +334,16 @@ class Thumbnail
 		if ($success)
 		{
 			$thumb_selector = $this->width . 'x' . $this->height . $this->filename_suffix;
-			$this->thumbnails[$thumb_selector] = $filename !== 'NULL' ? $filename : '';
+			$this->thumbnails[$thumb_selector] = $filename !== 'NULL' ? $filename : null;
-		}
 
-		return $success;
+			// For consistency, write new thumbnail filename to parent Image object.
+			// TODO: there could still be an inconsistency if multiple objects exists for the same image asset.
+			$this->image->getThumbnails()[$thumb_selector] = $this->thumbnails[$thumb_selector];
+
+			return $success;
+		}
+		else
+			throw new UnexpectedValueException('Thumbnail queuing query failed');
 	}
 
 	private function markAsQueued()

templates/PhotoPage.php

@@ -65,11 +65,9 @@ class PhotoPage extends SubTemplate
 					<a href="', $this->photo->getUrl(), '">';
 
 		if ($this->photo->isPortrait())
-			echo '
+			echo $this->photo->getInlineImage(null, 960);
-						<img src="', $this->photo->getThumbnailUrl(null, 960), '" alt="">';
 		else
-			echo '
+			echo $this->photo->getInlineImage(1280, null);
-						<img src="', $this->photo->getThumbnailUrl(1280, null), '" alt="">';
 
 		echo '
 					</a>

templates/PhotosIndex.php

@@ -90,8 +90,14 @@ class PhotosIndex extends SubTemplate
 					<a class="edit" href="', BASEURL, '/editasset/?id=', $image->getId(), '">Edit</a>';
 
 		echo '
-					<a href="', $image->getPageUrl(), $this->url_suffix, '">
+					<a href="', $image->getPageUrl(), $this->url_suffix, '#photo_frame">
-						<img src="', $image->getThumbnailUrl($width, $height, $crop, $fit), '" alt="" title="', $image->getTitle(), '">';
+						<img src="', $image->getThumbnailUrl($width, $height, $crop, $fit), '"';
+
+		// Can we offer double-density thumbs?
+		if ($image->width() >= $width * 2 && $image->height() >= $height * 2)
+			echo ' srcset="', $image->getThumbnailUrl($width * 2, $height * 2, $crop, $fit), ' 2x"';
+
+		echo ' alt="" title="', $image->getTitle(), '">';
 
 		if ($this->show_labels)
 			echo '