Current File : /home2/selectio/www/mm-tailor-billing/vendor/mike42/escpos-php/src/Mike42/Escpos/GdEscposImage.php
<?php
/**
* This file is part of escpos-php: PHP receipt printer library for use with
* ESC/POS-compatible thermal and impact printers.
*
* Copyright (c) 2014-16 Michael Billington < michael.billington@gmail.com >,
* incorporating modifications by others. See CONTRIBUTORS.md for a full list.
*
* This software is distributed under the terms of the MIT license. See LICENSE.md
* for details.
*/
namespace Mike42\Escpos;
use Mike42\Escpos\EscposImage;
use Exception;
/**
* Implementation of EscposImage using the GD PHP plugin.
*/
class GdEscposImage extends EscposImage
{
/**
* Load an image from disk, into memory, using GD.
*
* @param string|null $filename The filename to load from
* @throws Exception if the image format is not supported,
* or the file cannot be opened.
*/
protected function loadImageData($filename = null)
{
if ($filename === null) {
/* Set to blank image */
return parent::loadImageData($filename);
}
$ext = pathinfo($filename, PATHINFO_EXTENSION);
switch ($ext) {
case "png":
$im = @imagecreatefrompng($filename);
break;
case "jpg":
$im = @imagecreatefromjpeg($filename);
break;
case "gif":
$im = @imagecreatefromgif($filename);
break;
default:
throw new Exception("Image format not supported in GD");
}
$this -> readImageFromGdResource($im);
}
/**
* Load actual image pixels from GD resource.
*
* @param resource $im GD resource to use
* @throws Exception Where the image can't be read.
*/
public function readImageFromGdResource($im)
{
if (!is_resource($im)) {
throw new Exception("Failed to load image.");
} elseif (!EscposImage::isGdLoaded()) {
throw new Exception(__FUNCTION__ . " requires 'gd' extension.");
}
/* Make a string of 1's and 0's */
$imgHeight = imagesy($im);
$imgWidth = imagesx($im);
$imgData = str_repeat("\0", $imgHeight * $imgWidth);
for ($y = 0; $y < $imgHeight; $y++) {
for ($x = 0; $x < $imgWidth; $x++) {
/* Faster to average channels, blend alpha and negate the image here than via filters (tested!) */
$cols = imagecolorsforindex($im, imagecolorat($im, $x, $y));
// 1 for white, 0 for black, ignoring transparency
$greyness = (int)(($cols['red'] + $cols['green'] + $cols['blue']) / 3) >> 7;
// 1 for black, 0 for white, taking into account transparency
$black = (1 - $greyness) >> ($cols['alpha'] >> 6);
$imgData[$y * $imgWidth + $x] = $black;
}
}
$this -> setImgWidth($imgWidth);
$this -> setImgHeight($imgHeight);
$this -> setImgData($imgData);
}
}
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