function textimage_image_add_stroke in Textimage 5.2

Same name and namespace in other branches

1. 5 textimage.module \textimage_image_add_stroke()
2. 6.2 textimage.module \textimage_image_add_stroke()
3. 7.2 textimage.module \textimage_image_add_stroke()

Stroke function adds a solid color stroke around an image with a transparent background.

@todo Add $position parameter to allow the stroke to be applied 'inside', 'middle', or 'outside'. outside is the only current behavior.

Parameters

$img: The gd image resource of the image to modify

$thickness: The width of the stroke to apply

$color: The color of the stroke to apply

1 call to textimage_image_add_stroke()

textimage_image_from_preset in ./textimage.module

Loads the Textimage preset and generates the GD image resource.

File

./textimage.module, line 463

Code

function textimage_image_add_stroke($img, $thickness, $color, $text_opacity) {
  if ($thickness > 0) {
    $width = imagesx($img);
    $height = imagesy($img);

    // Create a new image which we'll lay over the original
    $border_img = imagecreatetruecolor($width, $height);
    $back = imagecolorallocatealpha($border_img, 0, 0, 0, 127);
    imagefill($border_img, 0, 0, $back);
    for ($x = 0; $x < $width; $x++) {
      for ($y = 0; $y < $height; $y++) {
        $c = imagecolorsforindex($img, imagecolorat($img, $x, $y));

        // Outside only modify pixels which are less opaque than the text opacity.
        if ($c['alpha'] > -($text_opacity - 100) / 100 * 127) {
          textimage_image_stroke_change_pixels($img, $border_img, $thickness, $color, $x, $y, $width, $height);
        }
      }
    }

    // Merge the images
    imagealphablending($img, TRUE);
    imagecopy($img, $border_img, 0, 0, 0, 0, $width, $height);
  }
  return $img;
}