Scale image dimensions if they exceed the max image constraints.
| public static getImageScale ( $width, $height, $maxImageWidth, $maxImageHeight ) : float | ||
| $width | ||
| $height | ||
| $maxImageWidth | ||
| $maxImageHeight | ||
| return | float | |
/**
* Get an image from a file or url, return it resized if the image exceeds the $maxImageWidth or $maxImageHeight directives.
*
* The return value is an array.
* ['width'] is the width of the image.
* ['height'] is the height of the image.
* ['mime'] is the mime type of the image. Resized images are always in jpeg format.
* ['image'] is the image data.
* ['ext'] is the extension of the image file.
*
* @param EPub $book
* @param string $imageSource path or url to file.
*
* @return array|bool
* @throws \Exception
*/
public static function getImage($book, $imageSource)
{
$width = -1;
$height = -1;
$mime = "application/octet-stream";
$ext = "";
$image = FileHelper::getFileContents($imageSource);
$ratio = 1;
if ($image !== false && strlen($image) > 0) {
if (BinStringStatic::startsWith(trim($image), '<svg') || (BinStringStatic::startsWith(trim($image), '<?xml') || strpos($image, '<svg') > 0)) {
// SVG image.
$xml = simplexml_load_string($image);
$attr = $xml->attributes();
$meta = ImageHelper::handleSVGAttribs($xml);
$mime = "image/svg+xml";
$ext = "svg";
$width = $meta['width'];
$height = $meta['height'];
$ratio = ImageHelper::getImageScale($width, $height, $book->maxImageWidth, $book->maxImageHeight);
if ($ratio < 1) {
$attr->width = $width * $ratio;
$attr->height = $height * $ratio;
}
$image = $xml->asXML();
} else {
$imageFile = imagecreatefromstring($image);
if ($imageFile !== false) {
$width = ImageSX($imageFile);
$height = ImageSY($imageFile);
}
if (self::isGdInstalled()) {
@($type = exif_imagetype($imageSource));
$mime = image_type_to_mime_type($type);
}
if ($mime === "application/octet-stream") {
$mime = ImageHelper::getImageFileTypeFromBinary($image);
}
if ($mime === "application/octet-stream") {
$mime = MimeHelper::getMimeTypeFromUrl($imageSource);
}
}
} else {
return false;
}
if ($width <= 0 || $height <= 0) {
return false;
}
if ($mime !== "image/svg+xml" && self::isGdInstalled()) {
$ratio = ImageHelper::getImageScale($width, $height, $book->maxImageWidth, $book->maxImageHeight);
if ($ratio < 1 || empty($mime)) {
if ($mime == "image/png" || $book->isGifImagesEnabled === false && $mime == "image/gif") {
$image_o = imagecreatefromstring($image);
$image_p = imagecreatetruecolor($width * $ratio, $height * $ratio);
imagealphablending($image_p, false);
imagesavealpha($image_p, true);
imagealphablending($image_o, true);
imagecopyresampled($image_p, $image_o, 0, 0, 0, 0, $width * $ratio, $height * $ratio, $width, $height);
ob_start();
imagepng($image_p, null, 9);
$image = ob_get_contents();
ob_end_clean();
imagedestroy($image_o);
imagedestroy($image_p);
$ext = "png";
} else {
if ($book->isGifImagesEnabled !== false && $mime == "image/gif") {
$tFileD = tempnam("BewareOfGeeksBearingGifs", "grD");
ResizeGif::ResizeByRatio($imageSource, $tFileD, $ratio);
$image = file_get_contents($tFileD);
unlink($tFileD);
} else {
$image_o = imagecreatefromstring($image);
$image_p = imagecreatetruecolor($width * $ratio, $height * $ratio);
imagecopyresampled($image_p, $image_o, 0, 0, 0, 0, $width * $ratio, $height * $ratio, $width, $height);
ob_start();
imagejpeg($image_p, null, 80);
$image = ob_get_contents();
ob_end_clean();
imagedestroy($image_o);
imagedestroy($image_p);
$mime = "image/jpeg";
$ext = "jpg";
}
}
}
}
if ($ext === "") {
static $mimeToExt = array('image/jpeg' => 'jpg', 'image/gif' => 'gif', 'image/png' => 'png', 'image/svg+xml' => "svg");
if (isset($mimeToExt[$mime])) {
$ext = $mimeToExt[$mime];
}
}
$rv = array();
$rv['width'] = $width * $ratio;
$rv['height'] = $height * $ratio;
$rv['mime'] = $mime;
$rv['image'] = $image;
$rv['ext'] = $ext;
return $rv;
}