Create a QR-Code Image with the php imagick library - php

Question

Hi,
We are using imagick for different image manipulations and have a request to add
QR watermarks in the end.
Right now I could only find PHP QR Code library which uses the GD2 library:
Implemented purely in PHP, no external dependencies except GD2
Is there any php snippet or library which uses imagick to create QR codes?

Answer 1

Looking at the PHP QR Code library, there is only one file (I think) that accesses the GD library: qrimage.php. So change that file to output via imagick and use the rest of PHP QR Code.
Below is a possible imagick output file I wrote to replace qrimage.php. However, I am unable to test this code, since I am on Windows, and cannot install imagick.
Can someone please debug it, and edit this post with any corrections?
<?php
/*
* PHP QR Code encoder
*
* Image output of code using GD2
*
* PHP QR Code is distributed under LGPL 3
* Copyright (C) 2010 Dominik Dzienia <deltalab at poczta dot fm>
*
* 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 3 of the License, or 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 02110-1301 USA
*/
define('QR_IMAGE', true);
class QRimage {
//----------------------------------------------------------------------
public static function png($frame, $filename = false, $pixelPerPoint = 4, $outerFrame = 4,$saveandprint=FALSE)
{
$image = self::image($frame, $pixelPerPoint, $outerFrame, "png", 85, $filename, $saveandprint);
}
//----------------------------------------------------------------------
public static function jpg($frame, $filename = false, $pixelPerPoint = 8, $outerFrame = 4, $q = 85)
{
$image = self::image($frame, $pixelPerPoint, $outerFrame, "jpeg", $q, $filename, $saveandprint);
}
//----------------------------------------------------------------------
private static function image($frame, $pixelPerPoint = 4, $outerFrame = 4,
$format = "png", $quality = 85, $filename = FALSE, $saveandprint = FALSE)
{
$imgH = count($frame);
$imgW = strlen($frame[0]);
$col[0] = new ImagickPixel("white");
$col[1] = new ImagickPixel("black");
$image = new Imagick();
$image->newImage($imgW, $imgH, $col[0]);
$image->setCompressionQuality($quality);
$image->setImageFormat($format);
$draw = new ImagickDraw();
$draw->setFillColor($col[1]);
for($y=0; $y<$imgH; $y++) {
for($x=0; $x<$imgW; $x++) {
if ($frame[$y][$x] == '1') {
$draw->point($x,$y);
}
}
}
$image->drawImage($draw);
$image->borderImage($col[0],$outerFrame,$outerFrame);
$image->scaleImage( $imgW * $pixelPerPoint, 0 );
if ($filename === FALSE) {
Header("Content-type: image/jpeg");
echo $image;
} else {
if($saveandprint===TRUE){
$image->writeImages($filename, true);
Header("Content-type: image/" . $format);
echo $image;
} else {
echo $image;
}
}
}
}
There is a merged file called phpqrcode.php that contains the entire qrimage.php, so you will either have to remerge that file, or else replace the relevant section.
If you use a different filename for the above code, you will have to change the reference in the file qrlib.php and merge.php.

Answer 2

I tested the above implementation and it worked.
There is one mistake : you missed to add the outerframe in the final image size.
$image->scaleImage( ($imgW + 2*$outerFrame) * $pixelPerPoint, 0 );
Also, it seems that GD library is a lot faster than ImageMagick in this case.
I benched the use of GD and imagick on the creation of the same 50 random qr codes.
I isolated the part were QR code are generated so in fact the use of QRimage::png.
I only teste png generation.
These are my results :
GD :
min time : 0,0148401260 s
max time : 0,0211210251 s
average : 0,0167747593 s
ImageMagick :
min time : 0,0799968243 s
max time : 0,1147611141 s
average : 0,0918840790 s
In the final code, this makes a little difference. The other part of the code takes something like 0.15s to run and on a large amount of codes it makes a difference (I benched QRcode::png with a result like : 0.17s per qrcode ith GD and 0.24s per code with imagemagick).