public function generatePreviewImage($pdfFile, $saveTo)
{
try {
$img = new imagick(Director::getAbsFile($pdfFile) . "[0]");
//we only take first page
// -flatten option, this is necessary for images with transparency, it will produce white background for transparent regions
$img->setImageAlphaChannel(11);
//Imagick::ALPHACHANNEL_REMOVE has been added in 3.2.0b2
$img->mergeImageLayers(imagick::LAYERMETHOD_FLATTEN);
//set new format
//@Todo detect format from filename
$img->setImageFormat('jpg');
$img->setCompressionQuality(100);
//save image file
$img->writeImages($saveTo, false);
} catch (\Exception $e) {
error_log($e->getMessage());
return false;
}
return true;
}
/**
* Convert to output format. This method convert from pdf to specified format with optimizing
* @throw Exception
* @access public
* @param string $outputPath - path to file. May content only path or path with filename
* @param int/string[=ALL] $page - number of document page wich will be converted into image. If specified 'ALL' - will be converted all pages.
* @param string $format - output format (see self::getFormats())
* @param array $resolution - array with x&y resolution DPI
* @param int $depth - bit depth image
* @return string/bool[false] - return image path of last converted page
*/
public function convert($outputPath = '', $page = 'ALL', $format = 'png', $resolution = array('x' => 300, 'y' => 300), $depth = 8)
{
if (!Imagick::queryFormats(strtoupper($format))) {
throw new Exception('Unsupported format');
}
$startTime = microtime(true);
$im = new imagick();
$im->setResolution($resolution['x'], $resolution['y']);
$format = strtolower($format);
$im->setFormat($format);
if ($outputPath) {
if (is_dir($outputPath)) {
$outputPath = $outputPath . pathinfo($this->filePathWithoutType, PATHINFO_FILENAME);
}
$outputFileName = $outputPath;
} else {
$outputFileName = $this->filePathWithoutType;
}
if ($page === 'ALL') {
$im->readImage($this->filePathWithoutType . '.pdf');
$im->setImageFormat($format);
$im->setImageAlphaChannel(11);
// it's a new constant imagick::ALPHACHANNEL_REMOVE
$im->mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN);
$im->setOption($format . ':bit-depth', $depth);
$im->writeImages($outputFileName . "." . $format, false);
$logString = '[POINT] File "' . $this->filePathWithoutType . '.pdf" converted to "' . $format . '" with ' . $im->getNumberImages() . ' pages (ex: ' . (microtime(true) - $startTime) . 's)';
$this->setLog($logString);
//Optimizing
if ($format == 'png' && $this->optipngChecking()) {
$startTime = microtime(true);
for ($page = $i = 0; $i < $im->getNumberImages(); $i++) {
$this->execute('optipng -o=5', $outputFileName . "-" . (int) $i . "." . $format);
}
$logString = '[POINT] Files "' . $outputFileName . '-x.' . $format . '" optimized (ex: ' . (microtime(true) - $startTime) . 's)';
$this->setLog($logString);
}
} else {
$im->readImage($this->filePathWithoutType . '.pdf[' . (int) $page . ']');
$im->setImageFormat($format);
$im->setImageAlphaChannel(11);
// it's a new constant imagick::ALPHACHANNEL_REMOVE
$im->mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN);
$im->setOption($format . ':color-type', 2);
$im->setOption($format . ':bit-depth', $depth);
$im->writeImage($outputFileName . "-" . (int) $page . "." . $format);
$logString = '[POINT] File "' . $outputFileName . '.pdf" converted to "' . $format . '" one page (ex: ' . (microtime(true) - $startTime) . 's)';
$this->setLog($logString);
//Optimizing
if ($format == 'png' && $this->optipngChecking()) {
$startTime = microtime(true);
$this->execute('optipng -o=5', $outputFileName . "-" . (int) $page . "." . $format);
$logString = '[POINT] File "' . $outputFileName . "-" . (int) $page . "." . $format . '" optimized (ex: ' . (microtime(true) - $startTime) . 's)';
$this->setLog($logString);
}
}
if (file_exists($outputFileName . "-" . (int) $page . "." . $format)) {
return $outputFileName . "-" . (int) $page . "." . $format;
} else {
return false;
}
}