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GD fallback when no Imagick ext #13

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45 changes: 45 additions & 0 deletions src/Parser/Command/PrintRasterBitImageCmd.php
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Original file line number Diff line number Diff line change
Expand Up @@ -69,10 +69,55 @@ public function asPng()
{
// Just a format conversion PBM -> PNG
$pbmBlob = $this -> asPbm();
if (!class_exists(Imagick::class)) {
return $this->asPngUsingGD($pbmBlob);
}

$im = new Imagick();
$im -> readImageBlob($pbmBlob, 'pbm');
$im->setResourceLimit(6, 1); // Prevent libgomp1 segfaults, grumble grumble.
$im -> setFormat('png');
return $im -> getImageBlob();
}

private function asPngUsingGD($pbmBlob) {
$fp = fopen("php://memory", "r+");
fwrite($fp, $pbmBlob);
rewind($fp);

$header = trim(fgets($fp));
do {
$pos = ftell($fp);
$line = trim(fgets($fp));
} while ($line !== false && str_starts_with($line, "#"));
fseek($fp, $pos);

[$width, $height] = array_map("intval", preg_split('/\s+/', trim(fgets($fp))));
$img = imagecreatetruecolor($width, $height);
imagefilledrectangle($img, 0, 0, $width, $height, imagecolorallocate($img, 255, 255, 255));

$black = imagecolorallocate($img, 0, 0, 0);
$rowBytes = (int)ceil($width / 8);
for ($y = 0; $y < $height; $y++) {
$row = fread($fp, $rowBytes);
$bits = unpack("C*", $row);
$x = 0;
foreach ($bits as $byte) {
for ($bit = 7; $bit >= 0; $bit--) {
if ($x >= $width) break;
$val = ($byte >> $bit) & 1;
if ($val === 1) {
imagesetpixel($img, $x, $y, $black);
}
$x++;
}
}
}

fclose($fp);
ob_start();
imagepng($img);
imagedestroy($img);
return ob_get_clean();
}
}
95 changes: 91 additions & 4 deletions src/Parser/Command/SelectBitImageModeCmd.php
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Original file line number Diff line number Diff line change
Expand Up @@ -54,17 +54,21 @@ public function getWidth()
{
return $this -> width;
}

protected function asReflectedPbm()
{
// Gemerate a PBM image from the source data. If we add a PBM header to the column
// format ESC/POS data with the width and height swapped, then we get a valid PBM, with
// the image reflected diagonally compared with the original.
return "P4\n" . $this -> getHeight() . " " . $this -> getWidth() . "\n" . $this -> data;
}

public function asPbm()
{
if (!class_exists(Imagick::class)) {
return $this->asPbmUsingGD($this -> asReflectedPbm());
}

// Reflect image diagonally from internally generated PBM
$pbmBlob = $this -> asReflectedPbm();
$im = new Imagick();
Expand All @@ -73,15 +77,98 @@ public function asPbm()
$im -> flopImage();
return $im -> getImageBlob();
}

public function asPng()
{
if (!class_exists(Imagick::class)) {
return $this->asPngUsingGD($this -> asReflectedPbm());
}

// Just a format conversion PBM -> PNG
$pbmBlob = $this -> asPbm();
$im = new Imagick();
$im -> readImageBlob($pbmBlob, 'pbm');
$im->setResourceLimit(6, 1); // Prevent libgomp1 segfaults, grumble grumble.
$im->setResourceLimit(6, 1); // Prevent libgomp1 segfaults, grumble grumble.
$im -> setFormat('png');
return $im -> getImageBlob();
}

private function asPbmUsingGD($pbmBlob)
{
$image = $this->createImageFromPBMUsingGd($pbmBlob);
if (!$image) {
throw new \Exception("No se pudo crear la imagen GD desde PBM");
}

$image = imagerotate($image, -90, 0);
$width = imagesx($image);
$height = imagesy($image);
$flipped = imagecreatetruecolor($width, $height);
imagecopyresampled($flipped, $image, 0, 0, $width - 1, 0, $width, $height, -$width, $height);
imagedestroy($image);

ob_start();
imagegd2($flipped);
$pngData = ob_get_clean();
imagedestroy($flipped);

return $pngData;
}

private function asPngUsingGD($pbmBlob)
{
$image = $this->createImageFromPBMUsingGd($pbmBlob);
if (!$image) {
throw new \Exception("No se pudo crear la imagen GD desde PBM");
}

$image = imagerotate($image, -90, 0);
$width = imagesx($image);
$height = imagesy($image);
$flipped = imagecreatetruecolor($width, $height);
imagecopyresampled($flipped, $image, 0, 0, $width - 1, 0, $width, $height, -$width, $height);
imagedestroy($image);

ob_start();
imagepng($flipped);
$pngData = ob_get_clean();
imagedestroy($flipped);

return $pngData;
}

private function createImageFromPBMUsingGd(string $pbmBlob)
{
$lines = preg_split('/\s+/', trim($pbmBlob));
if (count($lines) < 3 || $lines[0] !== 'P4') {
return null;
}

$width = (int) $lines[1];
$height = (int) $lines[2];
$headerEnd = strpos($pbmBlob, "\n", strpos($pbmBlob, $height) + strlen($height)) + 1;
$bitmapData = substr($pbmBlob, $headerEnd);

$img = imagecreatetruecolor($width, $height);
$white = imagecolorallocate($img, 255, 255, 255);
$black = imagecolorallocate($img, 0, 0, 0);
imagefill($img, 0, 0, $white);

$rowBytes = (int) ceil($width / 8);
$offset = 0;

for ($y = 0; $y < $height; $y++) {
$row = substr($bitmapData, $offset, $rowBytes);
$offset += $rowBytes;

for ($x = 0; $x < $width; $x++) {
$byteIndex = intdiv($x, 8);
$bitIndex = 7 - ($x % 8);
$bit = (ord($row[$byteIndex]) >> $bitIndex) & 1;
imagesetpixel($img, $x, $y, $bit ? $black : $white);
}
}

return $img;
}
}
45 changes: 45 additions & 0 deletions src/Parser/Command/StoreRasterFmtDataToPrintBufferGraphicsSubCmd.php
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Original file line number Diff line number Diff line change
Expand Up @@ -74,10 +74,55 @@ public function asPbm()
public function asPng()
{
$pbmBlob = $this -> asPbm();
if (!class_exists(Imagick::class)) {
return $this->asPngUsingGD($pbmBlob);
}

$im = new Imagick();
$im -> readImageBlob($pbmBlob, 'pbm');
$im->setResourceLimit(6, 1); // Prevent libgomp1 segfaults, grumble grumble.
$im -> setFormat('png');
return $im -> getImageBlob();
}

private function asPngUsingGD($pbmBlob) {
$fp = fopen("php://memory", "r+");
fwrite($fp, $pbmBlob);
rewind($fp);

$header = trim(fgets($fp));
do {
$pos = ftell($fp);
$line = trim(fgets($fp));
} while ($line !== false && str_starts_with($line, "#"));
fseek($fp, $pos);

[$width, $height] = array_map("intval", preg_split('/\s+/', trim(fgets($fp))));
$img = imagecreatetruecolor($width, $height);
imagefilledrectangle($img, 0, 0, $width, $height, imagecolorallocate($img, 255, 255, 255));

$black = imagecolorallocate($img, 0, 0, 0);
$rowBytes = (int)ceil($width / 8);
for ($y = 0; $y < $height; $y++) {
$row = fread($fp, $rowBytes);
$bits = unpack("C*", $row);
$x = 0;
foreach ($bits as $byte) {
for ($bit = 7; $bit >= 0; $bit--) {
if ($x >= $width) break;
$val = ($byte >> $bit) & 1;
if ($val === 1) {
imagesetpixel($img, $x, $y, $black);
}
$x++;
}
}
}

fclose($fp);
ob_start();
imagepng($img);
imagedestroy($img);
return ob_get_clean();
}
}