foreach ($pages as $page) {
$printer->graphics($page, Printer::IMG_DOUBLE_HEIGHT | Printer::IMG_DOUBLE_WIDTH);
}
$printer->cut();
$printer->close();
/*
* 3: PDF printing still too slow? If you regularly print the same files, serialize & compress your
* EscposImage objects (after printing[1]), instead of throwing them away.
*
* (You can also do this to print logos on computers which don't have an
* image processing library, by preparing a serialized version of your logo on your PC)
*
* [1]After printing, the pixels are loaded and formatted for the print command you used, so even a raspberry pi can print complex PDF's quickly.
*/
$connector = new FilePrintConnector("php://stdout");
$printer = new Printer($connector);
$pdf = 'resources/document.pdf';
$ser = 'resources/document.z';
if (!file_exists($ser)) {
$pages = ImagickEscposImage::loadPdf($pdf);
} else {
$pages = unserialize(gzuncompress(file_get_contents($ser)));
}
foreach ($pages as $page) {
$printer->graphics($page);
}
$printer->cut();
$printer->close();
if (!file_exists($ser)) {
file_put_contents($ser, gzcompress(serialize($pages)));
}
public function writeText($text)
{
if ($this->printer == null) {
throw new LogicException("Not attached to a printer.");
}
if ($text == null) {
return;
}
$text = trim($text, "\n");
/* Create Imagick objects */
$image = new \Imagick();
$draw = new \ImagickDraw();
$color = new \ImagickPixel('#000000');
$background = new \ImagickPixel('white');
/* Create annotation */
if ($this->font !== null) {
// Allow fallback on defaults as necessary
$draw->setFont($this->font);
}
/* In Arial, size 21 looks good as a substitute for FONT_B, 24 for FONT_A */
$draw->setFontSize($this->fontSize);
$draw->setFillColor($color);
$draw->setStrokeAntialias(true);
$draw->setTextAntialias(true);
$metrics = $image->queryFontMetrics($draw, $text);
$draw->annotation(0, $metrics['ascender'], $text);
/* Create image & draw annotation on it */
$image->newImage($metrics['textWidth'], $metrics['textHeight'], $background);
$image->setImageFormat('png');
$image->drawImage($draw);
// debugging if you want to view the images yourself
//$image -> writeImage("test.png");
/* Save image */
$escposImage = new ImagickEscposImage();
$escposImage->readImageFromImagick($image);
$size = Printer::IMG_DEFAULT;
$this->printer->bitImage($escposImage, $size);
}
/**
* Load a PDF for use on the printer
*
* @param string $pdfFile
* The file to load
* @param string $pageWidth
* The width, in pixels, of the printer's output. The first page of the
* PDF will be scaled to approximately fit in this area.
* @throws Exception Where Imagick is not loaded, or where a missing file
* or invalid page number is requested.
* @return multitype:EscposImage Array of images, retrieved from the PDF file.
*/
public static function loadPdf($pdfFile, $pageWidth = 550)
{
if (!EscposImage::isImagickLoaded()) {
throw new Exception(__FUNCTION__ . " requires imagick extension.");
}
/*
* Load first page at very low density (resolution), to figure out what
* density to use to achieve $pageWidth
*/
try {
$image = new \Imagick();
$testRes = 2;
// Test resolution
$image->setresolution($testRes, $testRes);
/* Load document just to measure geometry */
$image->readimage($pdfFile);
$geo = $image->getimagegeometry();
$image->destroy();
$width = $geo['width'];
$newRes = $pageWidth / $width * $testRes;
/* Load entire document in */
$image->setresolution($newRes, $newRes);
$image->readImage($pdfFile);
$pages = $image->getNumberImages();
/* Convert images to Escpos objects */
$ret = array();
for ($i = 0; $i < $pages; $i++) {
$image->setIteratorIndex($i);
$ep = new ImagickEscposImage();
$ep->readImageFromImagick($image);
$ret[] = $ep;
}
return $ret;
} catch (\ImagickException $e) {
/* Wrap in normal exception, so that classes which call this do not
* themselves require imagick as a dependency. */
throw new Exception($e);
}
}
<?php
/*
* Example of one way you could load a PNG data URI into an EscposImage object
* without using a file.
*/
require __DIR__ . '/../../autoload.php';
use Mike42\Escpos\Printer;
use Mike42\Escpos\PrintConnectors\FilePrintConnector;
use Mike42\Escpos\ImagickEscposImage;
// Data URI for a PNG image (red dot from https://en.wikipedia.org/wiki/Data_URI_scheme )
$uri = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUA\nAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO\n9TXL0Y4OHwAAAABJRU5ErkJggg==";
// Convert data URI to binary data
$imageBlob = base64_decode(explode(",", $uri)[1]);
// Give Imagick a filename with the correct extension to stop it from attempting
// to identify the format itself (this avoids CVE-2016–3714)
$imagick = new Imagick();
$imagick->setResourceLimit(6, 1);
// Prevent libgomp1 segfaults, grumble grumble.
$imagick->readImageBlob($imageBlob, "input.png");
// Load Imagick straight into an EscposImage object
$im = new ImagickEscposImage();
$im->readImageFromImagick($imagick);
// Do a test print to make sure that this EscposImage object has the right data
// (should see a tiny bullet point)
$connector = new FilePrintConnector("php://output");
$printer = new Printer($connector);
$printer->bitImage($im);
$printer->cut();
$printer->close();
