diff options
Diffstat (limited to 'modules/gallery/helpers/gallery_graphics.php')
| -rw-r--r-- | modules/gallery/helpers/gallery_graphics.php | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/modules/gallery/helpers/gallery_graphics.php b/modules/gallery/helpers/gallery_graphics.php new file mode 100644 index 0000000..eb76353 --- /dev/null +++ b/modules/gallery/helpers/gallery_graphics.php @@ -0,0 +1,183 @@ +<?php defined("SYSPATH") or die("No direct script access."); +/** + * Gallery - a web based photo album viewer and editor + * Copyright (C) 2000-2013 Bharat Mediratta + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. + */ +class gallery_graphics_Core { + /** + * Rotate an image. Valid options are degrees + * + * @param string $input_file + * @param string $output_file + * @param array $options + * @param Item_Model $item (optional) + */ + static function rotate($input_file, $output_file, $options, $item=null) { + graphics::init_toolkit(); + + $temp_file = system::temp_filename("rotate_", pathinfo($output_file, PATHINFO_EXTENSION)); + module::event("graphics_rotate", $input_file, $temp_file, $options, $item); + + if (@filesize($temp_file) > 0) { + // A graphics_rotate event made an image - move it to output_file and use it. + @rename($temp_file, $output_file); + } else { + // No events made an image - proceed with standard process. + if (@filesize($input_file) == 0) { + throw new Exception("@todo EMPTY_INPUT_FILE"); + } + + if (!isset($options["degrees"])) { + $options["degrees"] = 0; + } + + // Rotate the image. This also implicitly converts its format if needed. + Image::factory($input_file) + ->quality(module::get_var("gallery", "image_quality")) + ->rotate($options["degrees"]) + ->save($output_file); + } + + module::event("graphics_rotate_completed", $input_file, $output_file, $options, $item); + } + + /** + * Resize an image. Valid options are width, height and master. Master is one of the Image + * master dimension constants. + * + * @param string $input_file + * @param string $output_file + * @param array $options + * @param Item_Model $item (optional) + */ + static function resize($input_file, $output_file, $options, $item=null) { + graphics::init_toolkit(); + + $temp_file = system::temp_filename("resize_", pathinfo($output_file, PATHINFO_EXTENSION)); + module::event("graphics_resize", $input_file, $temp_file, $options, $item); + + if (@filesize($temp_file) > 0) { + // A graphics_resize event made an image - move it to output_file and use it. + @rename($temp_file, $output_file); + } else { + // No events made an image - proceed with standard process. + if (@filesize($input_file) == 0) { + throw new Exception("@todo EMPTY_INPUT_FILE"); + } + + list ($input_width, $input_height, $input_mime, $input_extension) = + photo::get_file_metadata($input_file); + if ($input_width && $input_height && + (empty($options["width"]) || empty($options["height"]) || empty($options["master"]) || + (max($input_width, $input_height) <= min($options["width"], $options["height"])))) { + // Photo dimensions well-defined, but options not well-defined or would upscale the image. + // Do not resize. Check mimes to see if we can copy the file or if we need to convert it. + // (checking mimes avoids needlessly converting jpg to jpeg, etc.) + $output_mime = legal_file::get_photo_types_by_extension(pathinfo($output_file, PATHINFO_EXTENSION)); + if ($input_mime && $output_mime && ($input_mime == $output_mime)) { + // Mimes well-defined and identical - copy input to output + copy($input_file, $output_file); + } else { + // Mimes not well-defined or not the same - convert input to output + $image = Image::factory($input_file) + ->quality(module::get_var("gallery", "image_quality")) + ->save($output_file); + } + } else { + // Resize the image. This also implicitly converts its format if needed. + $image = Image::factory($input_file) + ->resize($options["width"], $options["height"], $options["master"]) + ->quality(module::get_var("gallery", "image_quality")); + if (graphics::can("sharpen")) { + $image->sharpen(module::get_var("gallery", "image_sharpen")); + } + $image->save($output_file); + } + } + + module::event("graphics_resize_completed", $input_file, $output_file, $options, $item); + } + + /** + * Overlay an image on top of the input file. + * + * Valid options are: file, position, transparency, padding + * + * Valid positions: northwest, north, northeast, + * west, center, east, + * southwest, south, southeast + * + * padding is in pixels + * + * @param string $input_file + * @param string $output_file + * @param array $options + * @param Item_Model $item (optional) + */ + static function composite($input_file, $output_file, $options, $item=null) { + try { + graphics::init_toolkit(); + + $temp_file = system::temp_filename("composite_", pathinfo($output_file, PATHINFO_EXTENSION)); + module::event("graphics_composite", $input_file, $temp_file, $options, $item); + + if (@filesize($temp_file) > 0) { + // A graphics_composite event made an image - move it to output_file and use it. + @rename($temp_file, $output_file); + } else { + // No events made an image - proceed with standard process. + + list ($width, $height) = photo::get_file_metadata($input_file); + list ($w_width, $w_height) = photo::get_file_metadata($options["file"]); + + $pad = isset($options["padding"]) ? $options["padding"] : 10; + $top = $pad; + $left = $pad; + $y_center = max($height / 2 - $w_height / 2, $pad); + $x_center = max($width / 2 - $w_width / 2, $pad); + $bottom = max($height - $w_height - $pad, $pad); + $right = max($width - $w_width - $pad, $pad); + + switch ($options["position"]) { + case "northwest": $x = $left; $y = $top; break; + case "north": $x = $x_center; $y = $top; break; + case "northeast": $x = $right; $y = $top; break; + case "west": $x = $left; $y = $y_center; break; + case "center": $x = $x_center; $y = $y_center; break; + case "east": $x = $right; $y = $y_center; break; + case "southwest": $x = $left; $y = $bottom; break; + case "south": $x = $x_center; $y = $bottom; break; + case "southeast": $x = $right; $y = $bottom; break; + } + + Image::factory($input_file) + ->composite($options["file"], $x, $y, $options["transparency"]) + ->quality(module::get_var("gallery", "image_quality")) + ->save($output_file); + } + + module::event("graphics_composite_completed", $input_file, $output_file, $options, $item); + } catch (ErrorException $e) { + // Unlike rotate and resize, composite catches its exceptions here. This is because + // composite is typically called for watermarks. If during thumb/resize generation + // the watermark fails, we'd still like the image resized, just without its watermark. + // If the exception isn't caught here, graphics::generate will replace it with a + // placeholder. + Kohana_Log::add("error", $e->getMessage()); + } + } +} |