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<?php |
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namespace Thermal\Graphics; |
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use Thermal\Printer; |
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use Thermal\Buffer\Encoding; |
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use Thermal\Connection\Connection; |
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use Thermal\Graphics\Filter\FloydSteinberg; |
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class Image |
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{ |
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private $data; |
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private $lines; |
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private $width; |
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private $bytes_per_row; |
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public function __construct($filename, $filter = null) |
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{ |
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$filter = $filter ?: new FloydSteinberg(); |
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if (is_array($filename)) { |
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$this->loadImageData($filename, $filter); |
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} else { |
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$this->loadImage($filename, $filter); |
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} |
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} |
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public function getLines() |
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{ |
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return $this->lines; |
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} |
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public function getWidth() |
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{ |
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return $this->width; |
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} |
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public function getData() |
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{ |
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return $this->data; |
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} |
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public function bytesPerRow() |
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{ |
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return $this->bytes_per_row; |
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} |
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/** |
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* Load an image from disk, into memory, using GD. |
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* |
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* @param string $filename The filename to load from |
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* @param Filter $filter filter process |
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* @throws Exception if the image format is not supported, |
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* or the file cannot be opened. |
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*/ |
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protected function loadImage($filename, $filter) |
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{ |
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$ext = pathinfo($filename, PATHINFO_EXTENSION); |
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switch ($ext) { |
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case 'png': |
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$image = @imagecreatefrompng($filename); |
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break; |
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case 'jpg': |
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$image = @imagecreatefromjpeg($filename); |
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break; |
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case 'gif': |
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$image = @imagecreatefromgif($filename); |
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break; |
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default: |
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throw new \Exception(sprintf('Image format "%s" not supported in GD', $ext)); |
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} |
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if (!is_resource($image)) { |
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throw new \Exception(sprintf('Failed to load image "%s"', $filename)); |
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} |
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$processed_image = $filter->process($image); |
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imagedestroy($image); |
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$this->readImage($processed_image); |
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imagedestroy($processed_image); |
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} |
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/** |
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* Load an image from disk, into memory, using GD. |
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* |
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* @param string $filename The filename to load from |
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* @param Filter $filter filter process |
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* @throws Exception if the image format is not supported, |
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* or the file cannot be opened. |
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*/ |
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protected function loadImageData($data, $filter) |
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{ |
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$image = @imagecreatefromstring($data['data']); |
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if (!is_resource($image)) { |
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throw new \Exception(sprintf('Failed to load image "%s"', $data['name'])); |
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} |
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$processed_image = $filter->process($image); |
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imagedestroy($image); |
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$this->readImage($processed_image); |
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imagedestroy($processed_image); |
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} |
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/** |
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* Load actual image pixels from GD resource. |
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* |
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* @param resource $image GD resource to use |
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*/ |
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private function readImage($image) |
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{ |
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$width = imagesx($image); |
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$img_height = imagesy($image); |
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$bits = 24; |
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$slices = (int)($bits / 8); |
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$height = (int)(($img_height + $bits - 1) / $bits) * $bits; |
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$this->width = $width; |
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$this->bytes_per_row = $slices * $width; |
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$this->lines = (int)($height / $bits); |
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$pos = 0; |
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$data = str_repeat("\x00", $width * $height / 8); |
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for ($by = 0; $by < $img_height; $by += $bits) { |
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for ($x = 0; $x < $width; $x++) { |
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// loop slices |
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for ($s = 0; $s < $slices; $s++) { |
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$slice = 0b00000000; |
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for ($bit = 0; $bit < 8; $bit++) { |
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$y = $by + $s * 8 + $bit; |
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if ($y >= $img_height) { |
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break; |
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} |
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$color = imagecolorat($image, $x, $y); |
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$alpha = ($color >> 24) & 0xFF; |
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$red = ($color >> 16) & 0xFF; |
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$green = ($color >> 8) & 0xFF; |
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$blue = $color & 0xFF; |
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$greyness = (int)($red * 0.3 + $green * 0.59 + $blue * 0.11) >> 7; |
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// 1 for black, 0 for white, taking into account transparency |
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$dot = (1 - $greyness) >> ($alpha >> 6); |
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// apply the dot |
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$slice |= $dot << (7 - $bit); |
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} |
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$data[$pos] = chr($slice); |
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$pos++; |
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} |
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} |
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} |
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$this->data = $data; |
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} |
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1 |
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public function getLineData($index) |
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147
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{ |
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1 |
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return substr($this->getData(), $index * $this->bytesPerRow(), $this->bytesPerRow()); |
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} |
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} |
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mazinsw /
escpos
Loading history...
It seems like the type of the argument is not accepted by the function/method which you are calling.
In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug.
We suggest to add an explicit type cast like in the following example: