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