<?php
/*
* Smarty plugin "Thumb"
* Purpose: creates cached thumbnails
* Home: http://www.cerdmann.com/thumb/
* Copyright (C) 2005 Christoph Erdmann
*
* This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
* -------------------------------------------------------------
* Author: Christoph Erdmann (CE)
* Internet: http://www.cerdmann.com
*
* Author: Benjamin Fleckenstein (BF)
* Internet: http://www.benjaminfleckenstein.de
*
* Author: Marcus Gueldenmeister (MG)
* Internet: http://www.gueldenmeister.de/marcus/
*
* Author: Andreas Bц╤sch (AB)
* Changelog:
* 2005-10-31 Fixed some small bugs (CE)
* 2005-10-09 Rewrote crop-function (CE)
* 2005-10-08 Decreased processing time by prescaling linear and cleaned code (CE)
* 2005-07-13 Set crop=true as standard (CE)
* 2005-07-12 Added crop parameter. Original code by "djneoform at gmail dot com" (AB)
* 2005-07-02 Found a stupid mistake. Should be faster now (CE)
* 2005-06-02 Added file_exists(SOURCE)-trigger (CE)
* 2005-06-02 Added extrapolate parameter (CE)
* 2005-06-12 Bugfix alt/title (MG)
* 2005-06-10 Bugfix (MG)
* 2005-06-02 Added window parameter (MG)
* 2005-06-02 Made grey banner configurable, added possibility to keep format in thumbs
made cache path changeable (BF & MG)
* 2004-12-01 New link, hint, quality and type parameter (CE)
* 2004-12-02 Intergrated UnsharpMask (CE)
* -------------------------------------------------------------
*/
function smarty_function_thumb($params, &$smarty)
{
// Start time measurement
if ($params['dev'])
{
if (!function_exists('getmicrotime'))
{
function getmicrotime()
{
list($usec, $sec) = explode(" ",microtime());
return ((float)$usec + (float)$sec);
}
}
$time['start'] = getmicrotime();
}
// Funktion zum Schц╓rfen
if (!function_exists('UnsharpMask'))
{
// Unsharp mask algorithm by Torstein Hц╦nsi 2003 (thoensi_at_netcom_dot_no)
// Christoph Erdmann: changed it a little, cause i could not reproduce the darker blurred image, now it is up to 15% faster with same results
function UnsharpMask($img, $amount, $radius, $threshold)
{
// Attempt to calibrate the parameters to Photoshop:
if ($amount > 500) $amount = 500;
$amount = $amount * 0.016;
if ($radius > 50) $radius = 50;
$radius = $radius * 2;
if ($threshold > 255) $threshold = 255;
$radius = abs(round($radius)); // Only integers make sense.
if ($radius == 0) { return $img; imagedestroy($img); break; }
$w = imagesx($img); $h = imagesy($img);
$imgCanvas = $img;
$imgCanvas2 = $img;
$imgBlur = imagecreatetruecolor($w, $h);
// Gaussian blur matrix:
// 1 2 1
// 2 4 2
// 1 2 1
// Move copies of the image around one pixel at the time and merge them with weight
// according to the matrix. The same matrix is simply repeated for higher radii.
for ($i = 0; $i < $radius; $i++)
{
imagecopy ($imgBlur, $imgCanvas, 0, 0, 1, 1, $w - 1, $h - 1); // up left
imagecopymerge ($imgBlur, $imgCanvas, 1, 1, 0, 0, $w, $h, 50); // down right
imagecopymerge ($imgBlur, $imgCanvas, 0, 1, 1, 0, $w - 1, $h, 33.33333); // down left
imagecopymerge ($imgBlur, $imgCanvas, 1, 0, 0, 1, $w, $h - 1, 25); // up right
imagecopymerge ($imgBlur, $imgCanvas, 0, 0, 1, 0, $w - 1, $h, 33.33333); // left
imagecopymerge ($imgBlur, $imgCanvas, 1, 0, 0, 0, $w, $h, 25); // right
imagecopymerge ($imgBlur, $imgCanvas, 0, 0, 0, 1, $w, $h - 1, 20 ); // up
imagecopymerge ($imgBlur, $imgCanvas, 0, 1, 0, 0, $w, $h, 16.666667); // down
imagecopymerge ($imgBlur, $imgCanvas, 0, 0, 0, 0, $w, $h, 50); // center
}
$imgCanvas = $imgBlur;
// Calculate the difference between the blurred pixels and the original
// and set the pixels
for ($x = 0; $x < $w; $x++)
{ // each row
for ($y = 0; $y < $h; $y++)
{ // each pixel
$rgbOrig = ImageColorAt($imgCanvas2, $x, $y);
$rOrig = (($rgbOrig >> 16) & 0xFF);
$gOrig = (($rgbOrig >> 8) & 0xFF);
$bOrig = ($rgbOrig & 0xFF);
$rgbBlur = ImageColorAt($imgCanvas, $x, $y);
$rBlur = (($rgbBlur >> 16) & 0xFF);
$gBlur = (($rgbBlur >> 8) & 0xFF);
$bBlur = ($rgbBlur & 0xFF);
// When the masked pixels differ less from the original
// than the threshold specifies, they are set to their original value.
$rNew = (abs($rOrig - $rBlur) >= $threshold) ? max(0, min(255, ($amount * ($rOrig - $rBlur)) + $rOrig)) : $rOrig;
$gNew = (abs($gOrig - $gBlur) >= $threshold) ? max(0, min(255, ($amount * ($gOrig - $gBlur)) + $gOrig)) : $gOrig;
$bNew = (abs($bOrig - $bBlur) >= $threshold) ? max(0, min(255, ($amount * ($bOrig - $bBlur)) + $bOrig)) : $bOrig;
if (($rOrig != $rNew) || ($gOrig != $gNew) || ($bOrig != $bNew))
{
$pixCol = ImageColorAllocate($img, $rNew, $gNew, $bNew);
ImageSetPixel($img, $x, $y, $pixCol);
}
}
}
return $img;
}
}
$_CONFIG['types'] = array('','.gif','.jpg','.png');
### ц°bergebene Parameter auswerten und verifizieren
if (empty($params['cache'])) $_CONFIG['cache'] = 'images/cache/';
else $_CONFIG['cache'] = $params['cache'];
if (empty($params['file']) OR !file_exists($params['file'])) { $smarty->_trigger_fatal_error("thumb: parameter 'file' cannot be empty and must exist"); return; }
if (empty($params['link'])) $params['link'] = true;
if (empty($params['window'])) $params['window'] = true;
if (empty($params['hint'])) $params['hint'] = true;
if (empty($params['extrapolate'])) $params['extrapolate'] = true;
if (empty($params['dev'])) $params['crop'] = false;
if (empty($params['crop'])) $params['crop'] = true;
if (empty($params['width']) AND empty($params['height'])
AND empty($params['longside']) AND empty($params['shortside'])) $params['width'] = 100;
### Info ц╪ber Source (SRC) holen
$temp = getimagesize($params['file']);
$_SRC['file'] = $params['file'];
$_SRC['width'] = $temp[0];
$_SRC['height'] = $temp[1];
$_SRC['type'] = $temp[2]; // 1=GIF, 2=JPG, 3=PNG, SWF=4
$_SRC['string'] = $temp[3];
$_SRC['filename'] = basename($params['file']);
$_SRC['modified'] = filemtime($params['file']);
// Hash erstellen
$_SRC['hash'] = md5($_SRC['file'].$_SRC['modified'].implode('',$params));
### Infos ц╪ber Destination (DST) errechnen
if (is_numeric($params['width'])) $_DST['width'] = $params['width'];
else $_DST['width'] = round($params['height']/($_SRC['height']/$_SRC['width']));
if (is_numeric($params['height'])) $_DST['height'] = $params['height'];
else $_DST['height'] = round($params['width']/($_SRC['width']/$_SRC['height']));
// Das Grц╤ц÷enverhц╓ltnis soll erhalten bleiben egal ob das Bild hoch oder querformatig ist.
if (is_numeric($params['longside']))
{
if ($_SRC['width'] < $_SRC['height'])
{
$_DST['height'] = $params['longside'];
$_DST['width'] = round($params['longside']/($_SRC['height']/$_SRC['width']));
}
else
{
$_DST['width'] = $params['longside'];
$_DST['height'] = round($params['longside']/($_SRC['width']/$_SRC['height']));
}
}
elseif (is_numeric($params['shortside']))
{
if ($_SRC['width'] < $_SRC['height'])
{
$_DST['width'] = $params['shortside'];
$_DST['height'] = round($params['shortside']/($_SRC['width']/$_SRC['height']));
}
else
{
$_DST['height'] = $params['shortside'];
$_DST['width'] = round($params['shortside']/($_SRC['height']/$_SRC['width']));
}
}
// Soll beschnitten werden? (Standard)
if($params['crop'])
{
$width_ratio = $_SRC['width']/$_DST['width'];
$height_ratio = $_SRC['height']/$_DST['height'];
// Es muss an der Breite beschnitten werden
if ($width_ratio > $height_ratio)
{
$_DST['offset_w'] = round(($_SRC['width']-$_DST['width']*$height_ratio)/2);
$_SRC['width'] = round($_DST['width']*$height_ratio);
}
// es muss an der Hц╤he beschnitten werden
elseif ($width_ratio < $height_ratio)
{
$_DST['offset_h'] = round(($_SRC['height']-$_DST['height']*$width_ratio)/2);
$_SRC['height'] = round($_DST['height']*$width_ratio);
}
}
// Wenn das Ursprungsbild kleiner als das Ziel-Bild ist, soll nicht hochskaliert werden und die neu berechneten Werte werden wieder ц╪berschrieben
if ($params['extrapolate'] == 'false' && $_DST['height'] > $_SRC['height'] && $_DST['width'] > $_SRC['width'])
{
$_DST['width'] = $_SRC['width'];
$_DST['height'] = $_SRC['height'];
}
if (!empty($params['type'])) $_DST['type'] = $params['type'];
else $_DST['type'] = $_SRC['type'];
$_DST['file'] = $_CONFIG['cache'].$_SRC['hash'].$_CONFIG['types'][$_DST['type']];
$_DST['string'] = 'width="'.$_DST['width'].'" height="'.$_DST['height'].'"';
### Rц╪ckgabe-Strings erstellen
if (empty($params['html'])) $_RETURN['img'] = '[img]'.$_DST['file'].'[/img]';
else $_RETURN['img'] = '[img]'.$_DST['file'].'[/img]';
if ($params['link'] == "true")
{
if (empty($params['linkurl'])) $params['linkurl'] = $_SRC['file'];
if ($params['window'] == "true") $returner = '
'.$_RETURN['img'].'';
else $returner = '
'.$_RETURN['img'].'';
}
else
{
$returner = $_RETURN['img'];
}
### Cache-Datei abfangen
if (file_exists($_DST['file']) AND !$params['dev']) return $returner;
### ansonsten weitermachen
// SRC einlesen
if ($_SRC['type'] == 1) $_SRC['image'] = imagecreatefromgif($_SRC['file']);
if ($_SRC['type'] == 2) $_SRC['image'] = imagecreatefromjpeg($_SRC['file']);
if ($_SRC['type'] == 3) $_SRC['image'] = imagecreatefrompng($_SRC['file']);
// Wenn das Bild sehr groц÷ ist, zuerst linear auf vierfache Zielgrц╤ц÷e herunterskalieren und $_SRC ц╪berschreiben
if ($_DST['width']*4 < $_SRC['width'] AND $_DST['height']*4 < $_SRC['height'])
{
// Multiplikator der Zielgrц╤ц÷e
$_TMP['width'] = round($_DST['width']*4);
$_TMP['height'] = round($_DST['height']*4);
$_TMP['image'] = imagecreatetruecolor($_TMP['width'], $_TMP['height']);
imagecopyresized($_TMP['image'], $_SRC['image'], 0, 0, $_DST['offset_w'], $_DST['offset_h'], $_TMP['width'], $_TMP['height'], $_SRC['width'], $_SRC['height']);
$_SRC['image'] = $_TMP['image'];
$_SRC['width'] = $_TMP['width'];
$_SRC['height'] = $_TMP['height'];
// Wenn vorskaliert wird, darf ja nicht nochmal ein bestimmter Bereich ausgeschnitten werden
$_DST['offset_w'] = 0;
$_DST['offset_h'] = 0;
unset($_TMP['image']);
}
// DST erstellen
$_DST['image'] = imagecreatetruecolor($_DST['width'], $_DST['height']);
imagecopyresampled($_DST['image'], $_SRC['image'], 0, 0, $_DST['offset_w'], $_DST['offset_h'], $_DST['width'], $_DST['height'], $_SRC['width'], $_SRC['height']);
if ($params['sharpen'] != "false") $_DST['image'] = UnsharpMask($_DST['image'],80,.5,3);
// Soll eine Lupe eingefц╪gt werden?
if ($params['hint'] == "true" AND $params['link'] == "true")
{
//Soll der weiц÷e Balken wirklich hinzugefц╪gt werden?
if ($params['addgreytohint'] != 'false')
{
$trans = imagecolorallocatealpha($_DST['image'], 255, 255, 255, 25);
imagefilledrectangle($_DST['image'], 0, $_DST['height']-9, $_DST['width'], $_DST['height'], $trans);
}
$magnifier = imagecreatefromstring(gzuncompress(base64_decode("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</body>")));
imagealphablending($_DST['image'], true);
imagecopy($_DST['image'], $magnifier, $_DST['width']-15, $_DST['height']-14, 0, 0, 11, 11);
imagedestroy($magnifier);
}
// Berechnungszeit hinzufц╪gen
if ($params['dev'])
{
// Zeit anhalten
$time['end'] = getmicrotime();
$time = round($time['end'] - $time['start'],2);
// Farben definieren
$white_trans = imagecolorallocatealpha($_DST['image'], 255, 255, 255, 25);
$black = ImageColorAllocate ($_DST['image'], 0, 0, 0);
// Weiц÷er Balken oben
imagefilledrectangle($_DST['image'], 0, 0, $_DST['width'], 10, $white_trans);
// Schrift mit Zeitangabe
imagestring($_DST['image'], 1, 5, 2, 'processing time: '.$time.'s', $black);
}
// Thumbnail abspeichern
if ($_DST['type'] == 1)
{
imagetruecolortopalette($_DST['image'], false, 256);
imagegif($_DST['image'], $_DST['file']);
}
if ($_DST['type'] == 2)
{
if (empty($params['quality'])) $params['quality'] = 80;
imagejpeg($_DST['image'], $_DST['file'],$params['quality']);
}
if ($_DST['type'] == 3)
{
imagepng($_DST['image'], $_DST['file']);
}
imagedestroy($_DST['image']);
imagedestroy($_SRC['image']);
// Und Bild ausgeben
return $returner;
}
?>
FAQ
06-06-2006, 05:55 AM
Easy dynamic thumbnail generation
