1 image.inc | image_dimensions_scale(array &$dimensions, $width = NULL, $height = NULL, $upscale = FALSE) |
Scales image dimensions while maintaining aspect ratio.
The resulting dimensions can be smaller for one or both target dimensions.
Parameters
$dimensions: Dimensions to be modified - an array with components width and height, in pixels.
$width: The target width, in pixels. If this value is NULL then the scaling will be based only on the height value.
$height: The target height, in pixels. If this value is NULL then the scaling will be based only on the width value.
$upscale: Boolean indicating that images smaller than the target dimensions will be scaled up. This generally results in a low quality image.
Return value
TRUE if $dimensions was modified, FALSE otherwise.:
See also
Related topics
File
- core/
includes/ image.inc, line 258 - API for manipulating images.
Code
function image_dimensions_scale(array &$dimensions, $width = NULL, $height = NULL, $upscale = FALSE) {
$aspect = $dimensions['height'] / $dimensions['width'];
// Calculate one of the dimensions from the other target dimension,
// ensuring the same aspect ratio as the source dimensions. If one of the
// target dimensions is missing, that is the one that is calculated. If both
// are specified then the dimension calculated is the one that would not be
// calculated to be bigger than its target.
if (($width && !$height) || ($width && $height && $aspect < $height / $width)) {
$height = (int) round($width * $aspect);
}
else {
$width = (int) round($height / $aspect);
}
// Don't upscale if the option isn't enabled.
if (!$upscale && ($width >= $dimensions['width'] || $height >= $dimensions['height'])) {
return FALSE;
}
$dimensions['width'] = $width;
$dimensions['height'] = $height;
return TRUE;
}