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<?php
declare(strict_types=1);
namespace Endroid\QrCode\Writer;
use Endroid\QrCode\Bacon\MatrixFactory;
use Endroid\QrCode\Exception\ValidationException;
use Endroid\QrCode\ImageData\LabelImageData;
use Endroid\QrCode\ImageData\LogoImageData;
use Endroid\QrCode\Label\Alignment\LabelAlignmentLeft;
use Endroid\QrCode\Label\Alignment\LabelAlignmentRight;
use Endroid\QrCode\Label\LabelInterface;
use Endroid\QrCode\Logo\LogoInterface;
use Endroid\QrCode\QrCodeInterface;
use Endroid\QrCode\RoundBlockSizeMode\RoundBlockSizeModeNone;
use Endroid\QrCode\Writer\Result\PngResult;
use Endroid\QrCode\Writer\Result\ResultInterface;
use Zxing\QrReader;
final class PngWriter implements WriterInterface, ValidatingWriterInterface
{
public function write(QrCodeInterface $qrCode, LogoInterface $logo = null, LabelInterface $label = null, array $options = []): ResultInterface
{
if (!extension_loaded('gd')) {
throw new \Exception('Unable to generate image: please check if the GD extension is enabled and configured correctly');
}
$matrixFactory = new MatrixFactory();
$matrix = $matrixFactory->create($qrCode);
$baseBlockSize = $qrCode->getRoundBlockSizeMode() instanceof RoundBlockSizeModeNone ? 10 : intval($matrix->getBlockSize());
$baseImage = imagecreatetruecolor($matrix->getBlockCount() * $baseBlockSize, $matrix->getBlockCount() * $baseBlockSize);
if (!$baseImage) {
throw new \Exception('Unable to generate image: please check if the GD extension is enabled and configured correctly');
}
/** @var int $foregroundColor */
$foregroundColor = imagecolorallocatealpha(
$baseImage,
$qrCode->getForegroundColor()->getRed(),
$qrCode->getForegroundColor()->getGreen(),
$qrCode->getForegroundColor()->getBlue(),
$qrCode->getForegroundColor()->getAlpha()
);
/** @var int $transparentColor */
$transparentColor = imagecolorallocatealpha($baseImage, 255, 255, 255, 127);
imagefill($baseImage, 0, 0, $transparentColor);
for ($rowIndex = 0; $rowIndex < $matrix->getBlockCount(); ++$rowIndex) {
for ($columnIndex = 0; $columnIndex < $matrix->getBlockCount(); ++$columnIndex) {
if (1 === $matrix->getBlockValue($rowIndex, $columnIndex)) {
imagefilledrectangle(
$baseImage,
$columnIndex * $baseBlockSize,
$rowIndex * $baseBlockSize,
($columnIndex + 1) * $baseBlockSize - 1,
($rowIndex + 1) * $baseBlockSize - 1,
$foregroundColor
);
}
}
}
$targetWidth = $matrix->getOuterSize();
$targetHeight = $matrix->getOuterSize();
if ($label instanceof LabelInterface) {
$labelImageData = LabelImageData::createForLabel($label);
$targetHeight += $labelImageData->getHeight() + $label->getMargin()->getTop() + $label->getMargin()->getBottom();
}
$targetImage = imagecreatetruecolor($targetWidth, $targetHeight);
if (!$targetImage) {
throw new \Exception('Unable to generate image: please check if the GD extension is enabled and configured correctly');
}
/** @var int $backgroundColor */
$backgroundColor = imagecolorallocatealpha(
$targetImage,
$qrCode->getBackgroundColor()->getRed(),
$qrCode->getBackgroundColor()->getGreen(),
$qrCode->getBackgroundColor()->getBlue(),
$qrCode->getBackgroundColor()->getAlpha()
);
imagefill($targetImage, 0, 0, $backgroundColor);
imagecopyresampled(
$targetImage,
$baseImage,
$matrix->getMarginLeft(),
$matrix->getMarginLeft(),
0,
0,
$matrix->getInnerSize(),
$matrix->getInnerSize(),
imagesx($baseImage),
imagesy($baseImage)
);
if (PHP_VERSION_ID < 80000) {
imagedestroy($baseImage);
}
if ($qrCode->getBackgroundColor()->getAlpha() > 0) {
imagesavealpha($targetImage, true);
}
$result = new PngResult($matrix, $targetImage);
if ($logo instanceof LogoInterface) {
$result = $this->addLogo($logo, $result);
}
if ($label instanceof LabelInterface) {
$result = $this->addLabel($label, $result);
}
return $result;
}
private function addLogo(LogoInterface $logo, PngResult $result): PngResult
{
$logoImageData = LogoImageData::createForLogo($logo);
if ('image/svg+xml' === $logoImageData->getMimeType()) {
throw new \Exception('PNG Writer does not support SVG logo');
}
$targetImage = $result->getImage();
$matrix = $result->getMatrix();
if ($logoImageData->getPunchoutBackground()) {
/** @var int $transparent */
$transparent = imagecolorallocatealpha($targetImage, 255, 255, 255, 127);
imagealphablending($targetImage, false);
$xOffsetStart = intval($matrix->getOuterSize() / 2 - $logoImageData->getWidth() / 2);
$yOffsetStart = intval($matrix->getOuterSize() / 2 - $logoImageData->getHeight() / 2);
for ($xOffset = $xOffsetStart; $xOffset < $xOffsetStart + $logoImageData->getWidth(); ++$xOffset) {
for ($yOffset = $yOffsetStart; $yOffset < $yOffsetStart + $logoImageData->getHeight(); ++$yOffset) {
imagesetpixel($targetImage, $xOffset, $yOffset, $transparent);
}
}
}
imagecopyresampled(
$targetImage,
$logoImageData->getImage(),
intval($matrix->getOuterSize() / 2 - $logoImageData->getWidth() / 2),
intval($matrix->getOuterSize() / 2 - $logoImageData->getHeight() / 2),
0,
0,
$logoImageData->getWidth(),
$logoImageData->getHeight(),
imagesx($logoImageData->getImage()),
imagesy($logoImageData->getImage())
);
if (PHP_VERSION_ID < 80000) {
imagedestroy($logoImageData->getImage());
}
return new PngResult($matrix, $targetImage);
}
private function addLabel(LabelInterface $label, PngResult $result): PngResult
{
$targetImage = $result->getImage();
$labelImageData = LabelImageData::createForLabel($label);
/** @var int $textColor */
$textColor = imagecolorallocatealpha(
$targetImage,
$label->getTextColor()->getRed(),
$label->getTextColor()->getGreen(),
$label->getTextColor()->getBlue(),
$label->getTextColor()->getAlpha()
);
$x = intval(imagesx($targetImage) / 2 - $labelImageData->getWidth() / 2);
$y = imagesy($targetImage) - $label->getMargin()->getBottom();
if ($label->getAlignment() instanceof LabelAlignmentLeft) {
$x = $label->getMargin()->getLeft();
} elseif ($label->getAlignment() instanceof LabelAlignmentRight) {
$x = imagesx($targetImage) - $labelImageData->getWidth() - $label->getMargin()->getRight();
}
imagettftext($targetImage, $label->getFont()->getSize(), 0, $x, $y, $textColor, $label->getFont()->getPath(), $label->getText());
return new PngResult($result->getMatrix(), $targetImage);
}
public function validateResult(ResultInterface $result, string $expectedData): void
{
$string = $result->getString();
if (!class_exists(QrReader::class)) {
throw ValidationException::createForMissingPackage('khanamiryan/qrcode-detector-decoder');
}
if (PHP_VERSION_ID >= 80000) {
throw ValidationException::createForIncompatiblePhpVersion();
}
$reader = new QrReader($string, QrReader::SOURCE_TYPE_BLOB);
if ($reader->text() !== $expectedData) {
throw ValidationException::createForInvalidData($expectedData, strval($reader->text()));
}
}
}

vendor/endroid/qr-code/src/Writer/PngWriter.php line 23