Elgg\EntityIconService::saveIcon PHP Method

    public function saveIcon(ElggEntity $entity, ElggFile $file, $type = 'icon', array $coords = array())
    {
        $entity_type = $entity->getType();
        $entity_subtype = $entity->getSubtype();
        $x1 = (int) elgg_extract('x1', $coords);
        $y1 = (int) elgg_extract('y1', $coords);
        $x2 = (int) elgg_extract('x2', $coords);
        $y2 = (int) elgg_extract('y2', $coords);
        $file = $this->hooks->trigger("entity:{$type}:prepare", $entity_type, ['entity' => $entity, 'file' => $file], $file);
        if (!$file instanceof ElggFile || !$file->exists() || $file->getSimpleType() !== 'image') {
            $this->logger->error('Source file passed to ' . __METHOD__ . ' can not be resolved to a valid image');
            return false;
        }
        $cropping_mode = $x2 > $x1 && $y2 > $y1;
        if (!$cropping_mode) {
            $this->deleteIcon($entity, $type);
        }
        $success = function () use($entity, $type, $x1, $y1, $x2, $y2) {
            if ($type == 'icon') {
                $entity->icontime = time();
                if ($x1 || $y1 || $x2 || $y2) {
                    $entity->x1 = $x1;
                    $entity->y1 = $y1;
                    $entity->x2 = $x2;
                    $entity->y2 = $y2;
                }
            }
            $this->hooks->trigger("entity:{$type}:saved", $entity->getType(), ['entity' => $entity, 'x1' => $x1, 'y1' => $y1, 'x2' => $x2, 'y2' => $y2]);
            return true;
        };
        $fail = function () use($entity, $type) {
            $this->deleteIcon($entity, $type);
            return false;
        };
        $created = $this->hooks->trigger("entity:{$type}:save", $entity_type, ['entity' => $entity, 'file' => $file, 'x1' => $x1, 'y1' => $y1, 'x2' => $x2, 'y2' => $y2], false);
        if ($created === true) {
            return $success();
        }
        $sizes = $this->getSizes($entity_type, $entity_subtype, $type);
        foreach ($sizes as $size => $opts) {
            $square = (bool) elgg_extract('square', $opts);
            if ($type === 'icon' && $cropping_mode) {
                // Do not crop out non-square icons if cropping coordinates are a square
                $cropping_ratio = ($x2 - $x1) / ($y2 - $y1);
                if ($cropping_ratio == 1 && $square === false) {
                    continue;
                }
            }
            $icon = $this->getIcon($entity, $size, $type);
            // We need to make sure that file path is readable by
            // Imagine\Image\ImagineInterface::save(), as it fails to
            // build the directory structure on owner's filestore otherwise
            $icon->open('write');
            $icon->close();
            // Save the image without resizing or cropping if the
            // image size value is an empty array
            if (is_array($opts) && empty($opts)) {
                copy($file->getFilenameOnFilestore(), $icon->getFilenameOnFilestore());
                continue;
            }
            $source = $file->getFilenameOnFilestore();
            $destination = $icon->getFilenameOnFilestore();
            $resize_params = array_merge($opts, $coords);
            if (!_elgg_services()->imageService->resize($source, $destination, $resize_params)) {
                $this->logger->error("Failed to create {$size} icon from\n\t\t\t\t\t{$file->getFilenameOnFilestore()} with coords [{$x1}, {$y1}],[{$x2}, {$y2}]");
                return $fail();
            }
        }
        return $success();
    }