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117 lines
2.8 KiB
117 lines
2.8 KiB
<?php
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/*
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** Zabbix
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** Copyright (C) 2001-2023 Zabbix SIA
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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
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** (at 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,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU 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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function get_default_image() {
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$image = imagecreate(50, 50);
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$color = imagecolorallocate($image, 250, 50, 50);
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imagefill($image, 0, 0, $color);
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return $image;
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}
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/**
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* Get image data from db, cache is used
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* @param $imageid
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* @return array image data from db
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*/
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function get_image_by_imageid($imageid) {
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static $images = [];
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if (!isset($images[$imageid])) {
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$row = DBfetch(DBselect('SELECT i.* FROM images i WHERE i.imageid='.zbx_dbstr($imageid)));
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$images[$imageid] = $row;
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}
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return $images[$imageid];
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}
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/**
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* Resizes the given image resource to the specified size keeping the original
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* proportions of the image.
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*
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* @param resource $source
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* @param int $thumbWidth
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* @param int $thumbHeight
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*
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* @return resource
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*/
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function imageThumb($source, $thumbWidth = 0, $thumbHeight = 0) {
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$srcWidth = imagesx($source);
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$srcHeight = imagesy($source);
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if ($srcWidth > $thumbWidth || $srcHeight > $thumbHeight) {
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if ($thumbWidth == 0) {
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$thumbWidth = $thumbHeight * $srcWidth / $srcHeight;
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}
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elseif ($thumbHeight == 0) {
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$thumbHeight = $thumbWidth * $srcHeight / $srcWidth;
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}
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else {
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$a = $thumbWidth / $thumbHeight;
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$b = $srcWidth / $srcHeight;
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if ($a > $b) {
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$thumbWidth = $b * $thumbHeight;
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}
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else {
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$thumbHeight = $thumbWidth / $b;
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}
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}
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$thumbWidth = (int) round($thumbWidth);
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$thumbHeight = (int) round($thumbHeight);
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$thumb = imagecreatetruecolor($thumbWidth, $thumbHeight);
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// preserve png transparency
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imagealphablending($thumb, false);
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imagesavealpha($thumb, true);
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imagecopyresampled(
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$thumb, $source,
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0, 0,
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0, 0,
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$thumbWidth, $thumbHeight,
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$srcWidth, $srcHeight
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);
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imagedestroy($source);
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$source = $thumb;
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}
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return $source;
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}
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/**
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* Creates an image from a string preserving PNG transparency.
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*
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* @param $imageString
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*
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* @return resource
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*/
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function imageFromString($imageString) {
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$image = imagecreatefromstring($imageString);
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// preserve PNG transparency
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imagealphablending($image, false);
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imagesavealpha($image, true);
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return $image;
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}
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