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<?php
namespace Mpdf\Image;
use Mpdf\Cache;
use Mpdf\Color\ColorConverter;
use Mpdf\Color\ColorModeConverter;
use Mpdf\CssManager;
use Mpdf\File\StreamWrapperChecker;
use Mpdf\Gif\Gif;
use Mpdf\Language\LanguageToFontInterface;
use Mpdf\Language\ScriptToLanguageInterface;
use Mpdf\Log\Context as LogContext;
use Mpdf\Mpdf;
use Mpdf\Otl;
use Mpdf\RemoteContentFetcher;
use Mpdf\SizeConverter;
use Psr\Log\LoggerInterface;
class ImageProcessor implements \Psr\Log\LoggerAwareInterface
{
/**
* @var \Mpdf\Mpdf
*/
private $mpdf;
/**
* @var \Mpdf\Otl
*/
private $otl;
/**
* @var \Mpdf\CssManager
*/
private $cssManager;
/**
* @var \Mpdf\SizeConverter
*/
private $sizeConverter;
/**
* @var \Mpdf\Color\ColorConverter
*/
private $colorConverter;
/**
* @var \Mpdf\Color\ColorModeConverter
*/
private $colorModeConverter;
/**
* @var \Mpdf\Cache
*/
private $cache;
/**
* @var \Mpdf\Image\ImageTypeGuesser
*/
private $guesser;
/**
* @var string[]
*/
private $failedImages;
/**
* @var \Mpdf\Image\Bmp
*/
private $bmp;
/**
* @var \Mpdf\Image\Wmf
*/
private $wmf;
/**
* @var \Mpdf\Language\LanguageToFontInterface
*/
private $languageToFont;
/**
* @var \Mpdf\Language\ScriptToLanguageInterface
*/
public $scriptToLanguage;
/**
* @var \Mpdf\RemoteContentFetcher
*/
private $remoteContentFetcher;
/**
* @var \Psr\Log\LoggerInterface
*/
public $logger;
public function __construct(
Mpdf $mpdf,
Otl $otl,
CssManager $cssManager,
SizeConverter $sizeConverter,
ColorConverter $colorConverter,
ColorModeConverter $colorModeConverter,
Cache $cache,
LanguageToFontInterface $languageToFont,
ScriptToLanguageInterface $scriptToLanguage,
RemoteContentFetcher $remoteContentFetcher,
LoggerInterface $logger
) {
$this->mpdf = $mpdf;
$this->otl = $otl;
$this->cssManager = $cssManager;
$this->sizeConverter = $sizeConverter;
$this->colorConverter = $colorConverter;
$this->colorModeConverter = $colorModeConverter;
$this->cache = $cache;
$this->languageToFont = $languageToFont;
$this->scriptToLanguage = $scriptToLanguage;
$this->remoteContentFetcher = $remoteContentFetcher;
$this->logger = $logger;
$this->guesser = new ImageTypeGuesser();
$this->failedImages = [];
}
/**
* @param \Psr\Log\LoggerInterface
*
* @return self
*/
public function setLogger(LoggerInterface $logger)
{
$this->logger = $logger;
return $this;
}
public function getImage(&$file, $firsttime = true, $allowvector = true, $orig_srcpath = false, $interpolation = false)
{
/**
* Prevents insecure PHP object injection through phar:// wrapper
* @see https://github.com/mpdf/mpdf/issues/949
* @see https://github.com/mpdf/mpdf/issues/1381
*/
$wrapperChecker = new StreamWrapperChecker($this->mpdf);
if ($wrapperChecker->hasBlacklistedStreamWrapper($file)) {
return $this->imageError($file, $firsttime, 'File contains an invalid stream. Only ' . implode(', ', $wrapperChecker->getWhitelistedStreamWrappers()) . ' streams are allowed.');
}
if ($wrapperChecker->hasBlacklistedStreamWrapper($orig_srcpath)) {
return $this->imageError($orig_srcpath, $firsttime, 'File contains an invalid stream. Only ' . implode(', ', $wrapperChecker->getWhitelistedStreamWrappers()) . ' streams are allowed.');
}
// mPDF 6
// firsttime i.e. whether to add to this->images - use false when calling iteratively
// Image Data passed directly as var:varname
$type = null;
$data = '';
if (preg_match('/var:\s*(.*)/', $file, $v)) {
if (!isset($this->mpdf->imageVars[$v[1]])) {
return $this->imageError($file, $firsttime, 'Unknown image variable');
}
$data = $this->mpdf->imageVars[$v[1]];
$file = md5($data);
}
if (preg_match('/data:image\/(gif|jpe?g|png|webp);base64,(.*)/', $file, $v)) {
$type = $v[1];
$data = base64_decode($v[2]);
$file = md5($data);
}
// mPDF 5.7.4 URLs
if ($firsttime && $file && strpos($file, 'data:') !== 0) {
$file = str_replace(' ', '%20', $file);
}
if ($firsttime && $orig_srcpath) {
// If orig_srcpath is a relative file path (and not a URL), then it needs to be URL decoded
if (strpos($orig_srcpath, 'data:') !== 0) {
$orig_srcpath = str_replace(' ', '%20', $orig_srcpath);
}
if (!preg_match('/^(http|ftp)/', $orig_srcpath)) {
$orig_srcpath = $this->urldecodeParts($orig_srcpath);
}
}
$ppUx = 0;
if ($orig_srcpath && isset($this->mpdf->images[$orig_srcpath])) {
$file = $orig_srcpath;
return $this->mpdf->images[$orig_srcpath];
}
if (isset($this->mpdf->images[$file])) {
return $this->mpdf->images[$file];
}
if ($orig_srcpath && isset($this->mpdf->formobjects[$orig_srcpath])) {
$file = $orig_srcpath;
return $this->mpdf->formobjects[$file];
}
if (isset($this->mpdf->formobjects[$file])) {
return $this->mpdf->formobjects[$file];
}
if ($firsttime && isset($this->failedImages[$file])) { // Save re-trying image URL's which have already failed
return $this->imageError($file, $firsttime, '');
}
if (empty($data)) {
$data = '';
if ($orig_srcpath && $this->mpdf->basepathIsLocal && $check = @fopen($orig_srcpath, 'rb')) {
fclose($check);
$file = $orig_srcpath;
$this->logger->debug(sprintf('Fetching (file_get_contents) content of file "%s" with local basepath', $file), ['context' => LogContext::REMOTE_CONTENT]);
$data = file_get_contents($file);
$type = $this->guesser->guess($data);
}
if ($file && !$data && $check = @fopen($file, 'rb')) {
fclose($check);
$this->logger->debug(sprintf('Fetching (file_get_contents) content of file "%s" with non-local basepath', $file), ['context' => LogContext::REMOTE_CONTENT]);
$data = file_get_contents($file);
$type = $this->guesser->guess($data);
}
if ((!$data || !$type) && function_exists('curl_init')) { // mPDF 5.7.4
$data = $this->remoteContentFetcher->getFileContentsByCurl($file); // needs full url?? even on local (never needed for local)
if ($data) {
$type = $this->guesser->guess($data);
}
}
if ((!$data || !$type) && !ini_get('allow_url_fopen')) { // only worth trying if remote file and !ini_get('allow_url_fopen')
$data = $this->remoteContentFetcher->getFileContentsBySocket($file); // needs full url?? even on local (never needed for local)
if ($data) {
$type = $this->guesser->guess($data);
}
}
}
if (!$data) {
return $this->imageError($file, $firsttime, 'Could not find image file');
}
if ($type === null) {
$type = $this->guesser->guess($data);
}
if (($type === 'wmf' || $type === 'svg') && !$allowvector) {
return $this->imageError($file, $firsttime, 'WMF or SVG image file not supported in this context');
}
// SVG
if ($type === 'svg') {
$svg = new Svg($this->mpdf, $this->otl, $this->cssManager, $this, $this->sizeConverter, $this->colorConverter, $this->languageToFont, $this->scriptToLanguage);
$family = $this->mpdf->FontFamily;
$style = $this->mpdf->FontStyle;
$size = $this->mpdf->FontSizePt;
$info = $svg->ImageSVG($data);
// Restore font
if ($family) {
$this->mpdf->SetFont($family, $style, $size, false);
}
if (!$info) {
return $this->imageError($file, $firsttime, 'Error parsing SVG file');
}
$info['type'] = 'svg';
$info['i'] = count($this->mpdf->formobjects) + 1;
$this->mpdf->formobjects[$file] = $info;
return $info;
}
if ($type === 'webp') { // Convert webp images to JPG and treat them as such
$im = @imagecreatefromstring($data);
if (!function_exists('imagewebp') || false === $im) {
return $this->imageError($file, $firsttime, 'Missing GD support for WEBP images.');
}
$tempfile = $this->cache->tempFilename('_tempImgPNG' . md5($file) . random_int(1, 10000) . '.jpg');
$checkfile = $this->cache->tempFilename('_tempImgPNG' . md5($file) . random_int(1, 10000) . '.jpg');
$check = @imagewebp($im, $checkfile);
if (!$check) {
return $this->imageError($file, $firsttime, 'Error creating temporary file (' . $tempfile . ') when using GD library to parse WEBP image');
}
@imagejpeg($im, $tempfile);
$data = file_get_contents($tempfile);
imagedestroy($im);
unlink($tempfile);
unlink($checkfile);
$type = 'jpeg';
}
// JPEG
if ($type === 'jpeg' || $type === 'jpg') {
$hdr = $this->jpgHeaderFromString($data);
if (!$hdr) {
return $this->imageError($file, $firsttime, 'Error parsing JPG header');
}
$a = $this->jpgDataFromHeader($hdr);
$channels = (int) $a[4];
$j = strpos($data, 'JFIF');
if ($j) {
// Read resolution
$unitSp = ord(substr($data, $j + 7, 1));
if ($unitSp > 0) {
$ppUx = $this->twoBytesToInt(substr($data, $j + 8, 2)); // horizontal pixels per meter, usually set to zero
if ($unitSp === 2) { // = dots per cm (if == 1 set as dpi)
$ppUx = round($ppUx / 10 * 25.4);
}
}
}
if ($a[2] === 'DeviceCMYK' && ($this->mpdf->restrictColorSpace === 2 || ($this->mpdf->PDFA && $this->mpdf->restrictColorSpace !== 3))) {
// convert to RGB image
if (!function_exists('gd_info')) {
throw new \Mpdf\MpdfException(sprintf('JPG image may not use CMYK color space (%s).', $file));
}
if ($this->mpdf->PDFA && !$this->mpdf->PDFAauto) {
$this->mpdf->PDFAXwarnings[] = sprintf('JPG image may not use CMYK color space - %s - (Image converted to RGB. NB This will alter the colour profile of the image.)', $file);
}
$im = @imagecreatefromstring($data);
if ($im) {
$tempfile = $this->cache->tempFilename('_tempImgPNG' . md5($file) . random_int(1, 10000) . '.png');
imageinterlace($im, false);
$check = @imagepng($im, $tempfile);
if (!$check) {
return $this->imageError($file, $firsttime, 'Error creating temporary file (' . $tempfile . ') when using GD library to parse JPG(CMYK) image');
}
$info = $this->getImage($tempfile, false);
if (!$info) {
return $this->imageError($file, $firsttime, 'Error parsing temporary file (' . $tempfile . ') created with GD library to parse JPG(CMYK) image');
}
imagedestroy($im);
unlink($tempfile);
$info['type'] = 'jpg';
if ($firsttime) {
$info['i'] = count($this->mpdf->images) + 1;
$info['interpolation'] = $interpolation; // mPDF 6
$this->mpdf->images[$file] = $info;
}
return $info;
}
return $this->imageError($file, $firsttime, 'Error creating GD image file from JPG(CMYK) image');
}
if ($a[2] === 'DeviceRGB' && ($this->mpdf->PDFX || $this->mpdf->restrictColorSpace === 3)) {
// Convert to CMYK image stream - nominally returned as type='png'
$info = $this->convertImage($data, $a[2], 'DeviceCMYK', $a[0], $a[1], $ppUx, false);
if (($this->mpdf->PDFA && !$this->mpdf->PDFAauto) || ($this->mpdf->PDFX && !$this->mpdf->PDFXauto)) {
$this->mpdf->PDFAXwarnings[] = sprintf('JPG image may not use RGB color space - %s - (Image converted to CMYK. NB This will alter the colour profile of the image.)', $file);
}
} elseif (($a[2] === 'DeviceRGB' || $a[2] === 'DeviceCMYK') && $this->mpdf->restrictColorSpace === 1) {
// Convert to Grayscale image stream - nominally returned as type='png'
$info = $this->convertImage($data, $a[2], 'DeviceGray', $a[0], $a[1], $ppUx, false);
} else {
// mPDF 6 Detect Adobe APP14 Tag
//$pos = strpos($data, "\xFF\xEE\x00\x0EAdobe\0");
//if ($pos !== false) {
//}
// mPDF 6 ICC profile
$offset = 0;
$icc = [];
while (($pos = strpos($data, "ICC_PROFILE\0", $offset)) !== false) {
// get ICC sequence length
$length = $this->twoBytesToInt(substr($data, $pos - 2, 2)) - 16;
$sn = max(1, ord($data[$pos + 12]));
$nom = max(1, ord($data[$pos + 13]));
$icc[$sn - 1] = substr($data, $pos + 14, $length);
$offset = ($pos + 14 + $length);
}
// order and compact ICC segments
if (count($icc) > 0) {
ksort($icc);
$icc = implode('', $icc);
if (substr($icc, 36, 4) !== 'acsp') {
// invalid ICC profile
$icc = false;
}
$input = substr($icc, 16, 4);
$output = substr($icc, 20, 4);
// Ignore Color profiles for conversion to other colorspaces e.g. CMYK/Lab
if ($input !== 'RGB ' || $output !== 'XYZ ') {
$icc = false;
}
} else {
$icc = false;
}
$info = ['w' => $a[0], 'h' => $a[1], 'cs' => $a[2], 'bpc' => $a[3], 'f' => 'DCTDecode', 'data' => $data, 'type' => 'jpg', 'ch' => $channels, 'icc' => $icc];
if ($ppUx) {
$info['set-dpi'] = $ppUx;
}
}
if (!$info) {
return $this->imageError($file, $firsttime, 'Error parsing or converting JPG image');
}
if ($firsttime) {
$info['i'] = count($this->mpdf->images) + 1;
$info['interpolation'] = $interpolation; // mPDF 6
$this->mpdf->images[$file] = $info;
}
return $info;
}
if ($type === 'png') {
// Check signature
if (strpos($data, chr(137) . 'PNG' . chr(13) . chr(10) . chr(26) . chr(10)) !== 0) {
return $this->imageError($file, $firsttime, 'Error parsing PNG identifier');
}
// Read header chunk
if (substr($data, 12, 4) !== 'IHDR') {
return $this->imageError($file, $firsttime, 'Incorrect PNG file (no IHDR block found)');
}
$w = $this->fourBytesToInt(substr($data, 16, 4));
$h = $this->fourBytesToInt(substr($data, 20, 4));
$bpc = ord(substr($data, 24, 1));
$errpng = false;
$pngalpha = false;
$channels = 0;
// if($bpc>8) { $errpng = 'not 8-bit depth'; } // mPDF 6 Allow through to be handled as native PNG
$ct = ord(substr($data, 25, 1));
if ($ct === 0) {
$colspace = 'DeviceGray';
$channels = 1;
} elseif ($ct === 2) {
$colspace = 'DeviceRGB';
$channels = 3;
} elseif ($ct === 3) {
$colspace = 'Indexed';
$channels = 1;
} elseif ($ct === 4) {
$colspace = 'DeviceGray';
$channels = 1;
$errpng = 'alpha channel';
$pngalpha = true;
} else {
$colspace = 'DeviceRGB';
$channels = 3;
$errpng = 'alpha channel';
$pngalpha = true;
}
if ($ct < 4 && strpos($data, 'tRNS') !== false) {
$errpng = 'transparency';
$pngalpha = true;
} // mPDF 6
if ($ct === 3 && strpos($data, 'iCCP') !== false) {
$errpng = 'indexed plus ICC';
} // mPDF 6
// $pngalpha is used as a FLAG of any kind of transparency which COULD be tranferred to an alpha channel
// incl. single-color tarnsparency, depending which type of handling occurs later
if (ord(substr($data, 26, 1)) !== 0) {
$errpng = 'compression method';
} // only 0 should be specified
if (ord(substr($data, 27, 1)) !== 0) {
$errpng = 'filter method';
} // only 0 should be specified
if (ord(substr($data, 28, 1)) !== 0) {
$errpng = 'interlaced file';
}
$j = strpos($data, 'pHYs');
if ($j) {
//Read resolution
$unitSp = ord(substr($data, $j + 12, 1));
if ($unitSp === 1) {
$ppUx = $this->fourBytesToInt(substr($data, $j + 4, 4)); // horizontal pixels per meter, usually set to zero
$ppUx = round($ppUx / 1000 * 25.4);
}
}
// mPDF 6 Gamma correction
$gamma = 0;
$gAMA = 0;
$j = strpos($data, 'gAMA');
if ($j && strpos($data, 'sRGB') === false) { // sRGB colorspace - overrides gAMA
$gAMA = $this->fourBytesToInt(substr($data, $j + 4, 4)); // Gamma value times 100000
$gAMA /= 100000;
// http://www.libpng.org/pub/png/spec/1.2/PNG-Encoders.html
// "If the source file's gamma value is greater than 1.0, it is probably a display system exponent,..."
// ("..and you should use its reciprocal for the PNG gamma.")
//if ($gAMA > 1) { $gAMA = 1/$gAMA; }
// (Some) Applications seem to ignore it... appearing how it was probably intended
// Test Case - image(s) on http://www.w3.org/TR/CSS21/intro.html - PNG has gAMA set as 1.45454
// Probably unintentional as mentioned above and should be 0.45454 which is 1 / 2.2
// Tested on Windows PC
// Firefox and Opera display gray as 234 (correct, but looks wrong)
// IE9 and Safari display gray as 193 (incorrect but looks right)
// See test different gamma chunks at http://www.libpng.org/pub/png/pngsuite-all-good.html
}
if ($gAMA) {
$gamma = 1 / $gAMA;
}
// Don't need to apply gamma correction if == default i.e. 2.2
if ($gamma > 2.15 && $gamma < 2.25) {
$gamma = 0;
}
// NOT supported at present
//$j = strpos($data,'sRGB'); // sRGB colorspace - overrides gAMA
//$j = strpos($data,'cHRM'); // Chromaticity and Whitepoint
// $firsttime added mPDF 6 so when PNG Grayscale with alpha using resrtictcolorspace to CMYK
// the alpha channel is sent through as secondtime as Indexed and should not be converted to CMYK
if ($firsttime && ($colspace === 'DeviceRGB' || $colspace === 'Indexed') && ($this->mpdf->PDFX || $this->mpdf->restrictColorSpace === 3)) {
// Convert to CMYK image stream - nominally returned as type='png'
$info = $this->convertImage($data, $colspace, 'DeviceCMYK', $w, $h, $ppUx, $pngalpha, $gamma, $ct); // mPDF 5.7.2 Gamma correction
if (($this->mpdf->PDFA && !$this->mpdf->PDFAauto) || ($this->mpdf->PDFX && !$this->mpdf->PDFXauto)) {
$this->mpdf->PDFAXwarnings[] = sprintf('PNG image may not use RGB color space - %s - (Image converted to CMYK. NB This will alter the colour profile of the image.)', $file);
}
} elseif ($firsttime && ($colspace === 'DeviceRGB' || $colspace === 'Indexed') && $this->mpdf->restrictColorSpace === 1) {
// $firsttime added mPDF 6 so when PNG Grayscale with alpha using resrtictcolorspace to CMYK
// the alpha channel is sent through as secondtime as Indexed and should not be converted to CMYK
// Convert to Grayscale image stream - nominally returned as type='png'
$info = $this->convertImage($data, $colspace, 'DeviceGray', $w, $h, $ppUx, $pngalpha, $gamma, $ct); // mPDF 5.7.2 Gamma correction
} elseif (($this->mpdf->PDFA || $this->mpdf->PDFX) && $pngalpha) {
// Remove alpha channel
if ($this->mpdf->restrictColorSpace === 1) { // Grayscale
$info = $this->convertImage($data, $colspace, 'DeviceGray', $w, $h, $ppUx, $pngalpha, $gamma, $ct); // mPDF 5.7.2 Gamma correction
} elseif ($this->mpdf->restrictColorSpace === 3) { // CMYK
$info = $this->convertImage($data, $colspace, 'DeviceCMYK', $w, $h, $ppUx, $pngalpha, $gamma, $ct); // mPDF 5.7.2 Gamma correction
} elseif ($this->mpdf->PDFA) { // RGB
$info = $this->convertImage($data, $colspace, 'DeviceRGB', $w, $h, $ppUx, $pngalpha, $gamma, $ct); // mPDF 5.7.2 Gamma correction
}
if (($this->mpdf->PDFA && !$this->mpdf->PDFAauto) || ($this->mpdf->PDFX && !$this->mpdf->PDFXauto)) {
$this->mpdf->PDFAXwarnings[] = sprintf('Transparency (alpha channel) not permitted in PDFA or PDFX files - %s - (Image converted to one without transparency.)', $file);
}
} elseif ($firsttime && ($errpng || $pngalpha || $gamma)) { // mPDF 5.7.2 Gamma correction
$gd = function_exists('gd_info') ? gd_info() : [];
if (!isset($gd['PNG Support'])) {
return $this->imageError($file, $firsttime, sprintf('GD library with PNG support required for image (%s)', $errpng));
}
$im = imagecreatefromstring($data);
if (!$im) {
return $this->imageError($file, $firsttime, sprintf('Error creating GD image from PNG file (%s)', $errpng));
}
$w = imagesx($im);
$h = imagesy($im);
$tempfile = $this->cache->tempFilename('_tempImgPNG' . md5($file) . random_int(1, 10000) . '.png');
// Alpha channel set (including using tRNS for Paletted images)
if ($pngalpha) {
if ($this->mpdf->PDFA) {
throw new \Mpdf\MpdfException(sprintf('PDFA1-b does not permit images with alpha channel transparency (%s).', $file));
}
$imgalpha = imagecreate($w, $h);
// generate gray scale pallete
for ($c = 0; $c < 256; ++$c) {
imagecolorallocate($imgalpha, $c, $c, $c);
}
// mPDF 6
if ($colspace === 'Indexed') { // generate Alpha channel values from tRNS
// Read transparency info
$p = strpos($data, 'tRNS');
if ($p) {
$n = $this->fourBytesToInt(substr($data, $p - 4, 4));
$transparency = substr($data, $p + 4, $n);
// ord($transparency[$index]) = the alpha value for that index
// generate alpha channel
for ($ypx = 0; $ypx < $h; ++$ypx) {
for ($xpx = 0; $xpx < $w; ++$xpx) {
$colorindex = imagecolorat($im, $xpx, $ypx);
if ($colorindex >= $n) {
$alpha = 255;
} else {
$alpha = ord($transparency[$colorindex]);
} // 0-255
if ($alpha > 0) {
imagesetpixel($imgalpha, $xpx, $ypx, $alpha);
}
}
}
}
} elseif ($ct === 0 || $ct === 2) { // generate Alpha channel values from tRNS
// Get transparency as array of RGB
$p = strpos($data, 'tRNS');
if ($p) {
$trns = '';
$n = $this->fourBytesToInt(substr($data, $p - 4, 4));
$t = substr($data, $p + 4, $n);
if ($colspace === 'DeviceGray') { // ct===0
$trns = [$this->translateValue(substr($t, 0, 2), $bpc)];
} else /* $colspace=='DeviceRGB' */ { // ct==2
$trns = [];
$trns[0] = $this->translateValue(substr($t, 0, 2), $bpc);
$trns[1] = $this->translateValue(substr($t, 2, 2), $bpc);
$trns[2] = $this->translateValue(substr($t, 4, 2), $bpc);
}
// generate alpha channel
for ($ypx = 0; $ypx < $h; ++$ypx) {
for ($xpx = 0; $xpx < $w; ++$xpx) {
$rgb = imagecolorat($im, $xpx, $ypx);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
if ($colspace === 'DeviceGray' && $b == $trns[0]) {
$alpha = 0;
} elseif ($r == $trns[0] && $g == $trns[1] && $b == $trns[2]) {
$alpha = 0;
} else { // ct==2
$alpha = 255;
}
if ($alpha > 0) {
imagesetpixel($imgalpha, $xpx, $ypx, $alpha);
}
}
}
}
} else {
// extract alpha channel
for ($ypx = 0; $ypx < $h; ++$ypx) {
for ($xpx = 0; $xpx < $w; ++$xpx) {
$alpha = (imagecolorat($im, $xpx, $ypx) & 0x7F000000) >> 24;
if ($alpha < 127) {
imagesetpixel($imgalpha, $xpx, $ypx, 255 - ($alpha * 2));
}
}
}
}
// NB This must happen after the Alpha channel is extracted
// imagegammacorrect() removes the alpha channel data in $im - (I think this is a bug in PHP)
if ($gamma) {
imagegammacorrect($im, $gamma, 2.2);
}
$tempfile_alpha = $this->cache->tempFilename('_tempMskPNG' . md5($file) . random_int(1, 10000) . '.png');
$check = @imagepng($imgalpha, $tempfile_alpha);
if (!$check) {
return $this->imageError($file, $firsttime, 'Failed to create temporary image file (' . $tempfile_alpha . ') parsing PNG image with alpha channel (' . $errpng . ')');
}
imagedestroy($imgalpha);
// extract image without alpha channel
$imgplain = imagecreatetruecolor($w, $h);
imagealphablending($imgplain, false); // mPDF 5.7.2
imagecopy($imgplain, $im, 0, 0, 0, 0, $w, $h);
// create temp image file
$check = @imagepng($imgplain, $tempfile);
if (!$check) {
return $this->imageError($file, $firsttime, 'Failed to create temporary image file (' . $tempfile . ') parsing PNG image with alpha channel (' . $errpng . ')');
}
imagedestroy($imgplain);
// embed mask image
$minfo = $this->getImage($tempfile_alpha, false);
unlink($tempfile_alpha);
if (!$minfo) {
return $this->imageError($file, $firsttime, 'Error parsing temporary file (' . $tempfile_alpha . ') created with GD library to parse PNG image');
}
$imgmask = count($this->mpdf->images) + 1;
$minfo['cs'] = 'DeviceGray';
$minfo['i'] = $imgmask;
$this->mpdf->images[$tempfile_alpha] = $minfo;
// embed image, masked with previously embedded mask
$info = $this->getImage($tempfile, false);
unlink($tempfile);
if (!$info) {
return $this->imageError($file, $firsttime, 'Error parsing temporary file (' . $tempfile . ') created with GD library to parse PNG image');
}
$info['masked'] = $imgmask;
if ($ppUx) {
$info['set-dpi'] = $ppUx;
}
$info['type'] = 'png';
if ($firsttime) {
$info['i'] = count($this->mpdf->images) + 1;
$info['interpolation'] = $interpolation; // mPDF 6
$this->mpdf->images[$file] = $info;
}
return $info;
}
// No alpha/transparency set (but cannot read directly because e.g. bit-depth != 8, interlaced etc)
// ICC profile
$icc = false;
$p = strpos($data, 'iCCP');
if ($p && $colspace === "Indexed") { // Cannot have ICC profile and Indexed together
$p += 4;
$n = $this->fourBytesToInt(substr($data, ($p - 8), 4));
$nullsep = strpos(substr($data, $p, 80), chr(0));
$icc = substr($data, ($p + $nullsep + 2), ($n - ($nullsep + 2)));
$icc = @gzuncompress($icc); // Ignored if fails
if ($icc) {
if (substr($icc, 36, 4) !== 'acsp') {
$icc = false;
} // invalid ICC profile
else {
$input = substr($icc, 16, 4);
$output = substr($icc, 20, 4);
// Ignore Color profiles for conversion to other colorspaces e.g. CMYK/Lab
if ($input !== 'RGB ' || $output !== 'XYZ ') {
$icc = false;
}
}
}
// Convert to RGB colorspace so can use ICC Profile
if ($icc) {
imagepalettetotruecolor($im);
$colspace = 'DeviceRGB';
$channels = 3;
}
}
if ($gamma) {
imagegammacorrect($im, $gamma, 2.2);
}
imagealphablending($im, false);
imagesavealpha($im, false);
imageinterlace($im, false);
$check = @imagepng($im, $tempfile);
if (!$check) {
return $this->imageError($file, $firsttime, 'Failed to create temporary image file (' . $tempfile . ') parsing PNG image (' . $errpng . ')');
}
imagedestroy($im);
$info = $this->getImage($tempfile, false);
unlink($tempfile);
if (!$info) {
return $this->imageError($file, $firsttime, 'Error parsing temporary file (' . $tempfile . ') created with GD library to parse PNG image');
}
if ($ppUx) {
$info['set-dpi'] = $ppUx;
}
$info['type'] = 'png';
if ($firsttime) {
$info['i'] = count($this->mpdf->images) + 1;
$info['interpolation'] = $interpolation; // mPDF 6
if ($icc) {
$info['ch'] = $channels;
$info['icc'] = $icc;
}
$this->mpdf->images[$file] = $info;
}
return $info;
} else { // PNG image with no need to convert alph channels, bpc <> 8 etc.
$parms = '/DecodeParms <</Predictor 15 /Colors ' . $channels . ' /BitsPerComponent ' . $bpc . ' /Columns ' . $w . '>>';
//Scan chunks looking for palette, transparency and image data
$pal = '';
$trns = '';
$pngdata = '';
$icc = false;
$p = 33;
do {
$n = $this->fourBytesToInt(substr($data, $p, 4));
$p += 4;
$type = substr($data, $p, 4);
$p += 4;
if ($type === 'PLTE') {
//Read palette
$pal = substr($data, $p, $n);
$p += $n;
$p += 4;
} elseif ($type === 'tRNS') {
//Read transparency info
$t = substr($data, $p, $n);
$p += $n;
if ($ct === 0) {
$trns = [ord(substr($t, 1, 1))];
} elseif ($ct === 2) {
$trns = [ord(substr($t, 1, 1)), ord(substr($t, 3, 1)), ord(substr($t, 5, 1))];
} else {
$pos = strpos($t, chr(0));
if (is_int($pos)) {
$trns = [$pos];
}
}
$p += 4;
} elseif ($type === 'IDAT') {
$pngdata.=substr($data, $p, $n);
$p += $n;
$p += 4;
} elseif ($type === 'iCCP') {
$nullsep = strpos(substr($data, $p, 80), chr(0));
$icc = substr($data, $p + $nullsep + 2, $n - ($nullsep + 2));
$icc = @gzuncompress($icc); // Ignored if fails
if ($icc) {
if (substr($icc, 36, 4) !== 'acsp') {
$icc = false;
} // invalid ICC profile
else {
$input = substr($icc, 16, 4);
$output = substr($icc, 20, 4);
// Ignore Color profiles for conversion to other colorspaces e.g. CMYK/Lab
if ($input !== 'RGB ' || $output !== 'XYZ ') {
$icc = false;
}
}
}
$p += $n;
$p += 4;
} elseif ($type === 'IEND') {
break;
} elseif (preg_match('/[a-zA-Z]{4}/', $type)) {
$p += $n + 4;
} else {
return $this->imageError($file, $firsttime, 'Error parsing PNG image data');
}
} while ($n);
if (!$pngdata) {
return $this->imageError($file, $firsttime, 'Error parsing PNG image data - no IDAT data found');
}
if ($colspace === 'Indexed' && empty($pal)) {
return $this->imageError($file, $firsttime, 'Error parsing PNG image data - missing colour palette');
}
if ($colspace === 'Indexed' && $icc) {
$icc = false;
} // mPDF 6 cannot have ICC profile and Indexed in a PDF document as both use the colorspace tag.
$info = ['w' => $w, 'h' => $h, 'cs' => $colspace, 'bpc' => $bpc, 'f' => 'FlateDecode', 'parms' => $parms, 'pal' => $pal, 'trns' => $trns, 'data' => $pngdata, 'ch' => $channels, 'icc' => $icc];
$info['type'] = 'png';
if ($ppUx) {
$info['set-dpi'] = $ppUx;
}
}
if (!$info) {
return $this->imageError($file, $firsttime, 'Error parsing or converting PNG image');
}
if ($firsttime) {
$info['i'] = count($this->mpdf->images) + 1;
$info['interpolation'] = $interpolation; // mPDF 6
$this->mpdf->images[$file] = $info;
}
return $info;
} elseif ($type === 'gif') { // GIF
$gd = function_exists('gd_info')
? gd_info()
: [];
if (isset($gd['GIF Read Support']) && $gd['GIF Read Support']) {
$im = @imagecreatefromstring($data);
if ($im) {
$tempfile = $this->cache->tempFilename('_tempImgPNG' . md5($file) . random_int(1, 10000) . '.png');
imagealphablending($im, false);
imagesavealpha($im, false);
imageinterlace($im, false);
if (!is_writable($tempfile)) {
ob_start();
$check = @imagepng($im);
if (!$check) {
return $this->imageError($file, $firsttime, 'Error creating temporary image object when using GD library to parse GIF image');
}
$this->mpdf->imageVars['tempImage'] = ob_get_contents();
$tempimglnk = 'var:tempImage';
ob_end_clean();
$info = $this->getImage($tempimglnk, false);
if (!$info) {
return $this->imageError($file, $firsttime, 'Error parsing temporary file image object created with GD library to parse GIF image');
}
imagedestroy($im);
} else {
$check = @imagepng($im, $tempfile);
if (!$check) {
return $this->imageError($file, $firsttime, 'Error creating temporary file (' . $tempfile . ') when using GD library to parse GIF image');
}
$info = $this->getImage($tempfile, false);
if (!$info) {
return $this->imageError($file, $firsttime, 'Error parsing temporary file (' . $tempfile . ') created with GD library to parse GIF image');
}
imagedestroy($im);
unlink($tempfile);
}
$info['type'] = 'gif';
if ($firsttime) {
$info['i'] = count($this->mpdf->images) + 1;
$info['interpolation'] = $interpolation; // mPDF 6
$this->mpdf->images[$file] = $info;
}
return $info;
}
return $this->imageError($file, $firsttime, 'Error creating GD image file from GIF image');
}
$gif = new Gif();
$h = 0;
$w = 0;
$gif->loadFile($data, 0);
$nColors = 0;
$bgColor = -1;
$colspace = 'DeviceGray';
$pal = '';
if (isset($gif->m_img->m_gih->m_bLocalClr) && $gif->m_img->m_gih->m_bLocalClr) {
$nColors = $gif->m_img->m_gih->m_nTableSize;
$pal = $gif->m_img->m_gih->m_colorTable->toString();
if ((isset($bgColor)) && $bgColor !== -1) { // mPDF 5.7.3
$bgColor = $gif->m_img->m_gih->m_colorTable->colorIndex($bgColor);
}
$colspace = 'Indexed';
} elseif (isset($gif->m_gfh->m_bGlobalClr) && $gif->m_gfh->m_bGlobalClr) {
$nColors = $gif->m_gfh->m_nTableSize;
$pal = $gif->m_gfh->m_colorTable->toString();
if ((isset($bgColor)) && $bgColor != -1) {
$bgColor = $gif->m_gfh->m_colorTable->colorIndex($bgColor);
}
$colspace = 'Indexed';
}
$trns = '';
if (isset($gif->m_img->m_bTrans) && $gif->m_img->m_bTrans && ($nColors > 0)) {
$trns = [$gif->m_img->m_nTrans];
}
$gifdata = $gif->m_img->m_data;
$w = $gif->m_gfh->m_nWidth;
$h = $gif->m_gfh->m_nHeight;
$gif->ClearData();
if ($colspace === 'Indexed' && empty($pal)) {
return $this->imageError($file, $firsttime, 'Error parsing GIF image - missing colour palette');
}
if ($this->mpdf->compress) {
$gifdata = $this->gzCompress($gifdata);
$info = ['w' => $w, 'h' => $h, 'cs' => $colspace, 'bpc' => 8, 'f' => 'FlateDecode', 'pal' => $pal, 'trns' => $trns, 'data' => $gifdata];
} else {
$info = ['w' => $w, 'h' => $h, 'cs' => $colspace, 'bpc' => 8, 'pal' => $pal, 'trns' => $trns, 'data' => $gifdata];
}
$info['type'] = 'gif';
if ($firsttime) {
$info['i'] = count($this->mpdf->images) + 1;
$info['interpolation'] = $interpolation; // mPDF 6
$this->mpdf->images[$file] = $info;
}
return $info;
} elseif ($type === 'bmp') {
if ($this->bmp === null) {
$this->bmp = new Bmp($this->mpdf);
}
$info = $this->bmp->_getBMPimage($data, $file);
if (isset($info['error'])) {
return $this->imageError($file, $firsttime, $info['error']);
}
if ($firsttime) {
$info['i'] = count($this->mpdf->images) + 1;
$info['interpolation'] = $interpolation; // mPDF 6
$this->mpdf->images[$file] = $info;
}
return $info;
} elseif ($type === 'wmf') {
if ($this->wmf === null) {
$this->wmf = new Wmf($this->mpdf, $this->colorConverter);
}
$wmfres = $this->wmf->_getWMFimage($data);
if ($wmfres[0] == 0) {
if ($wmfres[1]) {
return $this->imageError($file, $firsttime, $wmfres[1]);
}
return $this->imageError($file, $firsttime, 'Error parsing WMF image');
}
$info = ['x' => $wmfres[2][0], 'y' => $wmfres[2][1], 'w' => $wmfres[3][0], 'h' => $wmfres[3][1], 'data' => $wmfres[1]];
$info['i'] = count($this->mpdf->formobjects) + 1;
$info['type'] = 'wmf';
$this->mpdf->formobjects[$file] = $info;
return $info;
} else { // UNKNOWN TYPE - try GD imagecreatefromstring
$gd = function_exists('gd_info')
? gd_info()
: [];
if (isset($gd['PNG Support']) && $gd['PNG Support']) {
$im = @imagecreatefromstring($data);
if (!$im) {
return $this->imageError($file, $firsttime, 'Error parsing image file - image type not recognised, and not supported by GD imagecreate');
}
$tempfile = $this->cache->tempFilename('_tempImgPNG' . md5($file) . random_int(1, 10000) . '.png');
imagealphablending($im, false);
imagesavealpha($im, false);
imageinterlace($im, false);
$check = @imagepng($im, $tempfile);
if (!$check) {
return $this->imageError($file, $firsttime, 'Error creating temporary file (' . $tempfile . ') when using GD library to parse unknown image type');
}
$info = $this->getImage($tempfile, false);
imagedestroy($im);
unlink($tempfile);
if (!$info) {
return $this->imageError($file, $firsttime, 'Error parsing temporary file (' . $tempfile . ') created with GD library to parse unknown image type');
}
$info['type'] = 'png';
if ($firsttime) {
$info['i'] = count($this->mpdf->images) + 1;
$info['interpolation'] = $interpolation; // mPDF 6
$this->mpdf->images[$file] = $info;
}
return $info;
}
}
return $this->imageError($file, $firsttime, 'Error parsing image file - image type not recognised');
}
private function convertImage(&$data, $colspace, $targetcs, $w, $h, $dpi, $mask, $gamma_correction = false, $pngcolortype = false)
{
if (!function_exists('gd_info')) {
return $this->imageError($file, $firsttime, 'GD library needed to parse image files');
}
if ($this->mpdf->PDFA || $this->mpdf->PDFX) {
$mask = false;
}
$im = @imagecreatefromstring($data);
$info = [];
$bpc = ord(substr($data, 24, 1));
if ($im) {
$imgdata = '';
$mimgdata = '';
$minfo = [];
// mPDF 6 Gamma correction
// Need to extract alpha channel info before imagegammacorrect (which loses the data)
if ($mask) { // i.e. $pngalpha for PNG
// mPDF 6
if ($colspace === 'Indexed') { // generate Alpha channel values from tRNS - only from PNG
//Read transparency info
$transparency = '';
$p = strpos($data, 'tRNS');
if ($p) {
$n = $this->fourBytesToInt(substr($data, $p - 4, 4));
$transparency = substr($data, $p + 4, $n);
// ord($transparency[$index]) = the alpha value for that index
// generate alpha channel
for ($ypx = 0; $ypx < $h; ++$ypx) {
for ($xpx = 0; $xpx < $w; ++$xpx) {
$colorindex = imagecolorat($im, $xpx, $ypx);
if ($colorindex >= $n) {
$alpha = 255;
} else {
$alpha = ord($transparency[$colorindex]);
} // 0-255
$mimgdata .= chr($alpha);
}
}
}
} elseif ($pngcolortype === 0 || $pngcolortype === 2) { // generate Alpha channel values from tRNS
// Get transparency as array of RGB
$p = strpos($data, 'tRNS');
if ($p) {
$trns = '';
$n = $this->fourBytesToInt(substr($data, $p - 4, 4));
$t = substr($data, $p + 4, $n);
if ($colspace === 'DeviceGray') { // ct===0
$trns = [$this->translateValue(substr($t, 0, 2), $bpc)];
} else /* $colspace=='DeviceRGB' */ { // ct==2
$trns = [];
$trns[0] = $this->translateValue(substr($t, 0, 2), $bpc);
$trns[1] = $this->translateValue(substr($t, 2, 2), $bpc);
$trns[2] = $this->translateValue(substr($t, 4, 2), $bpc);
}
// generate alpha channel
for ($ypx = 0; $ypx < $h; ++$ypx) {
for ($xpx = 0; $xpx < $w; ++$xpx) {
$rgb = imagecolorat($im, $xpx, $ypx);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
if ($colspace === 'DeviceGray' && $b == $trns[0]) {
$alpha = 0;
} elseif ($r == $trns[0] && $g == $trns[1] && $b == $trns[2]) {
$alpha = 0;
} // ct==2
else {
$alpha = 255;
}
$mimgdata .= chr($alpha);
}
}
}
} else {
for ($i = 0; $i < $h; $i++) {
for ($j = 0; $j < $w; $j++) {
$rgb = imagecolorat($im, $j, $i);
$alpha = ($rgb & 0x7F000000) >> 24;
if ($alpha < 127) {
$mimgdata .= chr(255 - ($alpha * 2));
} else {
$mimgdata .= chr(0);
}
}
}
}
}
// mPDF 6 Gamma correction
if ($gamma_correction) {
imagegammacorrect($im, $gamma_correction, 2.2);
}
//Read transparency info
$trns = [];
$trnsrgb = false;
if (!$this->mpdf->PDFA && !$this->mpdf->PDFX && !$mask) { // mPDF 6 added NOT mask
$p = strpos($data, 'tRNS');
if ($p) {
$n = $this->fourBytesToInt(substr($data, ($p - 4), 4));
$t = substr($data, $p + 4, $n);
if ($colspace === 'DeviceGray') { // ct===0
$trns = [$this->translateValue(substr($t, 0, 2), $bpc)];
} elseif ($colspace === 'DeviceRGB') { // ct==2
$trns[0] = $this->translateValue(substr($t, 0, 2), $bpc);
$trns[1] = $this->translateValue(substr($t, 2, 2), $bpc);
$trns[2] = $this->translateValue(substr($t, 4, 2), $bpc);
$trnsrgb = $trns;
if ($targetcs === 'DeviceCMYK') {
$col = $this->colorModeConverter->rgb2cmyk([3, $trns[0], $trns[1], $trns[2]]);
$c1 = (int) ($col[1] * 2.55);
$c2 = (int) ($col[2] * 2.55);
$c3 = (int) ($col[3] * 2.55);
$c4 = (int) ($col[4] * 2.55);
$trns = [$c1, $c2, $c3, $c4];
} elseif ($targetcs === 'DeviceGray') {
$c = (int) (($trns[0] * .21) + ($trns[1] * .71) + ($trns[2] * .07));
$trns = [$c];
}
} else { // Indexed
$pos = strpos($t, chr(0));
if (is_int($pos)) {
$pal = imagecolorsforindex($im, $pos);
$r = $pal['red'];
$g = $pal['green'];
$b = $pal['blue'];
$trns = [$r, $g, $b]; // ****
$trnsrgb = $trns;
if ($targetcs === 'DeviceCMYK') {
$col = $this->colorModeConverter->rgb2cmyk([3, $r, $g, $b]);
$c1 = (int) ($col[1] * 2.55);
$c2 = (int) ($col[2] * 2.55);
$c3 = (int) ($col[3] * 2.55);
$c4 = (int) ($col[4] * 2.55);
$trns = [$c1, $c2, $c3, $c4];
} elseif ($targetcs === 'DeviceGray') {
$c = (int) (($r * .21) + ($g * .71) + ($b * .07));
$trns = [$c];
}
}
}
}
}
for ($i = 0; $i < $h; $i++) {
for ($j = 0; $j < $w; $j++) {
$rgb = imagecolorat($im, $j, $i);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
if ($colspace === 'Indexed') {
$pal = imagecolorsforindex($im, $rgb);
$r = $pal['red'];
$g = $pal['green'];
$b = $pal['blue'];
}
if ($targetcs === 'DeviceCMYK') {
$col = $this->colorModeConverter->rgb2cmyk([3, $r, $g, $b]);
$c1 = (int) ($col[1] * 2.55);
$c2 = (int) ($col[2] * 2.55);
$c3 = (int) ($col[3] * 2.55);
$c4 = (int) ($col[4] * 2.55);
if ($trnsrgb) {
// original pixel was not set as transparent but processed color does match
if ($trnsrgb !== [$r, $g, $b] && $trns === [$c1, $c2, $c3, $c4]) {
if ($c4 === 0) {
$c4 = 1;
} else {
$c4--;
}
}
}
$imgdata .= chr($c1) . chr($c2) . chr($c3) . chr($c4);
} elseif ($targetcs === 'DeviceGray') {
$c = (int) (($r * .21) + ($g * .71) + ($b * .07));
if ($trnsrgb) {
// original pixel was not set as transparent but processed color does match
if ($trnsrgb !== [$r, $g, $b] && $trns === [$c]) {
if ($c === 0) {
$c = 1;
} else {
$c--;
}
}
}
$imgdata .= chr($c);
} elseif ($targetcs === 'DeviceRGB') {
$imgdata .= chr($r) . chr($g) . chr($b);
}
}
}
if ($targetcs === 'DeviceGray') {
$ncols = 1;
} elseif ($targetcs === 'DeviceRGB') {
$ncols = 3;
} elseif ($targetcs === 'DeviceCMYK') {
$ncols = 4;
}
$imgdata = $this->gzCompress($imgdata);
$info = ['w' => $w, 'h' => $h, 'cs' => $targetcs, 'bpc' => 8, 'f' => 'FlateDecode', 'data' => $imgdata, 'type' => 'png',
'parms' => '/DecodeParms <</Colors ' . $ncols . ' /BitsPerComponent 8 /Columns ' . $w . '>>'];
if ($dpi) {
$info['set-dpi'] = $dpi;
}
if ($mask) {
$mimgdata = $this->gzCompress($mimgdata);
$minfo = ['w' => $w, 'h' => $h, 'cs' => 'DeviceGray', 'bpc' => 8, 'f' => 'FlateDecode', 'data' => $mimgdata, 'type' => 'png',
'parms' => '/DecodeParms <</Colors ' . $ncols . ' /BitsPerComponent 8 /Columns ' . $w . '>>'];
if ($dpi) {
$minfo['set-dpi'] = $dpi;
}
$tempfile = '_tempImgPNG' . md5($data) . random_int(1, 10000) . '.png';
$imgmask = count($this->mpdf->images) + 1;
$minfo['i'] = $imgmask;
$this->mpdf->images[$tempfile] = $minfo;
$info['masked'] = $imgmask;
} elseif ($trns) {
$info['trns'] = $trns;
}
imagedestroy($im);
}
return $info;
}
private function jpgHeaderFromString(&$data)
{
$p = 4;
$p += $this->twoBytesToInt(substr($data, $p, 2)); // Length of initial marker block
$marker = substr($data, $p, 2);
while ($marker !== chr(255) . chr(192) && $marker !== chr(255) . chr(194) && $marker !== chr(255) . chr(193) && $p < strlen($data)) {
// Start of frame marker (FFC0) (FFC1) or (FFC2)
$p += $this->twoBytesToInt(substr($data, $p + 2, 2)) + 2; // Length of marker block
$marker = substr($data, $p, 2);
}
if ($marker !== chr(255) . chr(192) && $marker !== chr(255) . chr(194) && $marker !== chr(255) . chr(193)) {
return false;
}
return substr($data, $p + 2, 10);
}
private function jpgDataFromHeader($hdr)
{
$bpc = ord(substr($hdr, 2, 1));
if (!$bpc) {
$bpc = 8;
}
$h = $this->twoBytesToInt(substr($hdr, 3, 2));
$w = $this->twoBytesToInt(substr($hdr, 5, 2));
$channels = ord(substr($hdr, 7, 1));
if ($channels === 3) {
$colspace = 'DeviceRGB';
} elseif ($channels === 4) {
$colspace = 'DeviceCMYK';
} else {
$colspace = 'DeviceGray';
}
return [$w, $h, $colspace, $bpc, $channels];
}
/**
* Corrects 2-byte integer to 8-bit depth value
* If original image is bpc != 8, tRNS will be in this bpc
* $im from imagecreatefromstring will always be in bpc=8
* So why do we only need to correct 16-bit tRNS and NOT 2 or 4-bit???
*/
private function translateValue($s, $bpc)
{
$n = $this->twoBytesToInt($s);
if ($bpc == 16) {
$n = ($n >> 8);
}
//elseif ($bpc==4) { $n = ($n << 2); }
//elseif ($bpc==2) { $n = ($n << 4); }
return $n;
}
/**
* Read a 4-byte integer from string
*/
private function fourBytesToInt($s)
{
return (ord($s[0]) << 24) + (ord($s[1]) << 16) + (ord($s[2]) << 8) + ord($s[3]);
}
/**
* Equivalent to _get_ushort
* Read a 2-byte integer from string
*/
private function twoBytesToInt($s)
{
return (ord(substr($s, 0, 1)) << 8) + ord(substr($s, 1, 1));
}
private function gzCompress($data)
{
if (!function_exists('gzcompress')) {
throw new \Mpdf\MpdfException('gzcompress is not available. install ext-zlib extension.');
}
return gzcompress($data);
}
/**
* Throw an exception and save re-trying image URL's which have already failed
*/
private function imageError($file, $firsttime, $msg)
{
$this->failedImages[$file] = true;
if ($firsttime && ($this->mpdf->showImageErrors || $this->mpdf->debug)) {
throw new \Mpdf\MpdfImageException(sprintf('%s (%s)', $msg, substr($file, 0, 256)));
}
$this->logger->warning(sprintf('%s (%s)', $msg, $file), ['context' => LogContext::IMAGES]);
}
/**
* @since mPDF 5.7.4
* @param string $url
* @return string
*/
private function urldecodeParts($url)
{
$file = $url;
$query = '';
if (preg_match('/[?]/', $url)) {
$bits = preg_split('/[?]/', $url, 2);
$file = $bits[0];
$query = '?' . $bits[1];
}
$file = rawurldecode($file);
$query = urldecode($query);
return $file . $query;
}
}