public static function initDimensions($requiredWidth, $requiredHeight)
{
self::$requiredWidth = $requiredWidth;
self::$requiredHeight = $requiredHeight;
self::$requiredAspectRatio = $requiredWidth / $requiredHeight;
self::$initialized = true;
}
/**
* Look for the smallest delta from original aspect ratio.
* If the deltas match:
* If the dimensions match - give priority to the default thumbnail (if any).
* Otherwise:
* Give priority to the thumbnail the exactly matches the required dimensions.
* If none exist - prefer the asset with larger dimensions.
*
* @param kThumbnailDescriptor $a @see getNearestAspectRatioThumbnailDescriptorFromThumbAssets()
* @param kThumbnailDescriptor $b @see getNearestAspectRatioThumbnailDescriptorFromThumbAssets()
* @return int (-1) = a before b, (+1) = a after b, (0) = don't care (equal)
*/
private static function compareThumbnailDescriptors($a, $b)
{
$aDelta = $a->getDeltaFromOrigAspectRatio();
$bDelta = $b->getDeltaFromOrigAspectRatio();
// Look for the smaller delta
if ($aDelta < $bDelta) {
return -1;
} else {
if ($aDelta > $bDelta) {
return 1;
} else {
// Note: Because the aspect ratio is identical, it's enough to check just one dimension (we'll check the width)
$aWidth = $a->getWidth();
$bWidth = $b->getWidth();
if ($aWidth != $bWidth) {
$requiredWidth = kThumbnailDescriptor::getRequiredWidth();
// Give priority to exact-match dimensions
if ($aWidth == $requiredWidth) {
return -1;
} else {
if ($bWidth == $requiredWidth) {
return 1;
} else {
// Give priority to the one the the larger dimensions
return $bWidth - $aWidth;
// < 0 = $a has priority, > 0 = $b has priority, 0 = equal
}
}
} else {
// Boost the priority of the larger asset for the sake of better quality
// by looking for the asset with the bigger dimensions
return $b->getIsDefault() - $a->getIsDefault();
// -1 = $a has priority, 1 = $b has priority, 0 = equal
}
}
}
}
