/**
* Resample this image to the new width and height. If the image is set to constrain, then use only
* either the width or the height present. If both dimensions are the same, and constrain is set to
* true, this means that the image is the same size as the original file that created it, unless it has
* been resampled previously.
* If an output path is provided, write this image to a file, otherwise, just copy it to a new resource
* and discard the other one.
*/
function resample($output_path, $quality = 100)
{
/*if the width and height are both set, but the image has not been resampled*/
if ($this->width == $this->info->width() && $this->height == $this->info->height()) {
$do_resample = false;
$new_width = $this->width;
$new_height = $this->height;
} else {
if ($this->width && $this->height) {
$do_resample = true;
$new_width = $this->width;
$new_height = $this->height;
$orig_width = $this->info->width();
$orig_height = $this->info->height();
} else {
if ($this->width && !$this->height) {
$do_resample = true;
$orig_width = $this->info->width();
$orig_height = $this->info->height();
$ratio = $this->width / $orig_width;
$new_width = $this->width;
$new_height = $orig_height * $ratio;
//preserve original ratio
} else {
if ($this->height && !$this->width) {
$do_resample = true;
$orig_width = $this->info->width();
$orig_height = $this->info->height();
$ratio = $this->height / $orig_height;
$new_height = $this->height;
$new_width = $orig_width * $ratio;
//preserve original ratio
}
}
}
}
if ($do_resample) {
$write_image = ImageUtility::createTrueColour($new_width, $new_height);
imagecopyresampled($write_image, $this->res, 0, 0, 0, 0, $new_width, $new_height, $orig_width, $orig_height);
} else {
$write_image = $this->res;
}
if ($write_image) {
$this->write($write_image, $output_path);
}
}
