/**
* Resizes an image proportionally to fit within the defined max_width and max_height limits
*
* - Will do nothing to the image if the file fits within the size limits
* - If Image Magick is present it will use those function over any GD solutions
* - If GD2 is present, it'll use it to achieve better quality (imagecopyresampled)
* - Saves the new image to destination_filename, in the preferred_format
* if possible, default is jpeg.
*
* @uses GD
* @uses Imagick
*
* @package Graphics
* @param resource|null $src_img null for Imagick images, resource form imagecreatefrom for GD
* @param string $destName
* @param int $src_width
* @param int $src_height
* @param int $max_width
* @param int $max_height
* @param bool $force_resize = false
* @param int $preferred_format = 0
*/
function resizeImage($src_img, $destName, $src_width, $src_height, $max_width, $max_height, $force_resize = false, $preferred_format = 0)
{
global $gd2;
if (checkImagick()) {
// These are the file formats we know about
static $default_formats = array('1' => 'gif', '2' => 'jpeg', '3' => 'png', '6' => 'bmp', '15' => 'wbmp');
$preferred_format = empty($preferred_format) || !isset($default_formats[$preferred_format]) ? 2 : $preferred_format;
// Since Imagick can throw exceptions, lets catch them
try {
// Get a new instance of Imagick for use
$imagick = new Imagick($destName);
// Set the input and output image size
$src_width = empty($src_width) ? $imagick->getImageWidth() : $src_width;
$src_height = empty($src_height) ? $imagick->getImageHeight() : $src_height;
$dest_width = empty($max_width) ? $src_width : $max_width;
$dest_height = empty($max_height) ? $src_height : $max_height;
// Create a new image in our prefered format and resize it if needed
$imagick->setImageFormat($default_formats[$preferred_format]);
$imagick->resizeImage($dest_width, $dest_height, Imagick::FILTER_LANCZOS, 1, true);
// Save the new image in the destination location
$success = $imagick->writeImage($destName);
// Free resources associated with the Imagick object
$imagick->destroy();
} catch (Exception $e) {
// Not currently used, but here is the error
$success = $e->getMessage();
$success = false;
}
return !empty($success);
} elseif (checkGD()) {
$success = false;
// Determine whether to resize to max width or to max height (depending on the limits.)
if (!empty($max_width) || !empty($max_height)) {
if (!empty($max_width) && (empty($max_height) || $src_height * $max_width / $src_width <= $max_height)) {
$dst_width = $max_width;
$dst_height = floor($src_height * $max_width / $src_width);
} elseif (!empty($max_height)) {
$dst_width = floor($src_width * $max_height / $src_height);
$dst_height = $max_height;
}
// Don't bother resizing if it's already smaller...
if (!empty($dst_width) && !empty($dst_height) && ($dst_width < $src_width || $dst_height < $src_height || $force_resize)) {
// (make a true color image, because it just looks better for resizing.)
if ($gd2) {
$dst_img = imagecreatetruecolor($dst_width, $dst_height);
// Deal nicely with a PNG - because we can.
if (!empty($preferred_format) && $preferred_format == 3) {
imagealphablending($dst_img, false);
if (function_exists('imagesavealpha')) {
imagesavealpha($dst_img, true);
}
}
} else {
$dst_img = imagecreate($dst_width, $dst_height);
}
// Resize it!
if ($gd2) {
imagecopyresampled($dst_img, $src_img, 0, 0, 0, 0, $dst_width, $dst_height, $src_width, $src_height);
} else {
imagecopyresamplebicubic($dst_img, $src_img, 0, 0, 0, 0, $dst_width, $dst_height, $src_width, $src_height);
}
} else {
$dst_img = $src_img;
}
} else {
$dst_img = $src_img;
}
// Save the image as ...
if (!empty($preferred_format) && $preferred_format == 3 && function_exists('imagepng')) {
$success = imagepng($dst_img, $destName);
} elseif (!empty($preferred_format) && $preferred_format == 1 && function_exists('imagegif')) {
$success = imagegif($dst_img, $destName);
} elseif (function_exists('imagejpeg')) {
$success = imagejpeg($dst_img, $destName, 80);
}
// Free the memory.
imagedestroy($src_img);
if ($dst_img != $src_img) {
imagedestroy($dst_img);
}
return $success;
} else {
return false;
}
}
/**
* Resizes src_img proportionally to fit within max_width and max_height limits
* if it is too large.
* If GD2 is present, it'll use it to achieve better quality.
* It saves the new image to destination_filename, as preferred_format
* if possible, default is jpeg.
* @uses GD
*
* @param resource $src_img
* @param string $destName
* @param int $src_width
* @param int $src_height
* @param int $max_width
* @param int $max_height
* @param bool $force_resize = false
* @param int $preferred_format = 0
*/
function resizeImage($src_img, $destName, $src_width, $src_height, $max_width, $max_height, $force_resize = false, $preferred_format = 0)
{
global $gd2, $modSettings;
if (checkImagick()) {
static $default_formats = array('1' => 'gif', '2' => 'jpeg', '3' => 'png', '6' => 'bmp', '15' => 'wbmp');
$preferred_format = empty($preferred_format) || !isset($default_formats[$preferred_format]) ? 2 : $preferred_format;
$imagick = new Imagick($destName);
$src_width = empty($src_width) ? $imagick->getImageWidth() : $src_width;
$src_height = empty($src_height) ? $imagick->getImageHeight() : $src_height;
$dest_width = empty($max_width) ? $src_width : $max_width;
$dest_height = empty($max_height) ? $src_height : $max_height;
$imagick->setImageFormat($default_formats[$preferred_format]);
$imagick->resizeImage($dest_width, $dest_height, Imagick::FILTER_LANCZOS, 1, true);
$success = $imagick->writeImage($destName);
return !empty($success);
} elseif (checkGD()) {
$success = false;
// Determine whether to resize to max width or to max height (depending on the limits.)
if (!empty($max_width) || !empty($max_height)) {
if (!empty($max_width) && (empty($max_height) || $src_height * $max_width / $src_width <= $max_height)) {
$dst_width = $max_width;
$dst_height = floor($src_height * $max_width / $src_width);
} elseif (!empty($max_height)) {
$dst_width = floor($src_width * $max_height / $src_height);
$dst_height = $max_height;
}
// Don't bother resizing if it's already smaller...
if (!empty($dst_width) && !empty($dst_height) && ($dst_width < $src_width || $dst_height < $src_height || $force_resize)) {
// (make a true color image, because it just looks better for resizing.)
if ($gd2) {
$dst_img = imagecreatetruecolor($dst_width, $dst_height);
// Deal nicely with a PNG - because we can.
if (!empty($preferred_format) && $preferred_format == 3) {
imagealphablending($dst_img, false);
if (function_exists('imagesavealpha')) {
imagesavealpha($dst_img, true);
}
}
} else {
$dst_img = imagecreate($dst_width, $dst_height);
}
// Resize it!
if ($gd2) {
imagecopyresampled($dst_img, $src_img, 0, 0, 0, 0, $dst_width, $dst_height, $src_width, $src_height);
} else {
imagecopyresamplebicubic($dst_img, $src_img, 0, 0, 0, 0, $dst_width, $dst_height, $src_width, $src_height);
}
} else {
$dst_img = $src_img;
}
} else {
$dst_img = $src_img;
}
// Save the image as ...
if (!empty($preferred_format) && $preferred_format == 3 && function_exists('imagepng')) {
$success = imagepng($dst_img, $destName);
} elseif (!empty($preferred_format) && $preferred_format == 1 && function_exists('imagegif')) {
$success = imagegif($dst_img, $destName);
} elseif (function_exists('imagejpeg')) {
$success = imagejpeg($dst_img, $destName);
}
// Free the memory.
imagedestroy($src_img);
if ($dst_img != $src_img) {
imagedestroy($dst_img);
}
return $success;
} else {
// Without GD, no image resizing at all.
return false;
}
}
