function image_gd_create_tmp

Create a truecolor image preserving transparency from a provided image.

Parameters

$image: An image object.

$width: The new width of the new image, in pixels.

$height: The new height of the new image, in pixels.

Return value

A GD image handle.:

Related topics

File

core/modules/system/image.gd.inc, line 319

GD2 toolkit for image manipulation within Backdrop.

Code

function image_gd_create_tmp(stdClass $image, $width, $height) {
  $res = imagecreatetruecolor($width, $height);
  if ($image->info['extension'] == 'gif') {
    // Check if the original gif has transparency.
    $transparent = imagecolortransparent($image->resource);
    if ($transparent >= 0) {
      // Convert to truecolor for easier transparency handling.
      imagepalettetotruecolor($image->resource);
      $transparent = imagecolortransparent($image->resource);
      // As both are truecolor, we can use the same index now.
      imagecolortransparent($res, $transparent);
      imagefill($res, 0, 0, $transparent);
    }
    else {
      // The original image doesn't have a transparent color set.
      // Flood with the closest we have to white instead.
      imagefill($res, 0, 0, imagecolorclosest($res, 255, 255, 255));
    }
  }
  else {
    if ($image->info['extension'] == 'png' || $image->info['extension'] == 'webp') {
      imagealphablending($res, FALSE);
      $transparency = imagecolorallocatealpha($res, 0, 0, 0, 127);
      imagefill($res, 0, 0, $transparency);
      imagealphablending($res, TRUE);
      imagesavealpha($res, TRUE);
    }
    else {
      imagefill($res, 0, 0, imagecolorallocate($res, 255, 255, 255));
    }
  }

  return $res;
}