function imageapi_hex2rgba in ImageAPI 6

Same name and namespace in other branches

1. 5 imageapi.module \imageapi_hex2rgba()

Convert a hex string to its RGBA (Red, Green, Blue, Alpha) integer components.

Parameters

$hex: A string specifing an RGB color in the formats: '#ABC','ABC','#ABCD','ABCD','#AABBCC','AABBCC','#AABBCCDD','AABBCCDD'

Return value

An array with four elements for red, green, blue, and alpha.

1 call to imageapi_hex2rgba()

imagerotate in ./imagerotate.inc

File

./imageapi.module, line 427

An ImageAPI supporting additional image plugins as modules. Images are treated as objects, and images are not written per manipulation as Drupal's core image handling works.

Code

function imageapi_hex2rgba($hex) {
  $hex = ltrim($hex, '#');
  if (preg_match('/^[0-9a-f]{3}$/i', $hex)) {

    // 'FA3' is the same as 'FFAA33' so r=FF, g=AA, b=33
    $r = str_repeat($hex[0], 2);
    $g = str_repeat($hex[1], 2);
    $b = str_repeat($hex[2], 2);
    $a = '0';
  }
  elseif (preg_match('/^[0-9a-f]{6}$/i', $hex)) {

    // #FFAA33 or r=FF, g=AA, b=33
    list($r, $g, $b) = str_split($hex, 2);
    $a = '0';
  }
  elseif (preg_match('/^[0-9a-f]{8}$/i', $hex)) {

    // #FFAA33 or r=FF, g=AA, b=33
    list($r, $g, $b, $a) = str_split($hex, 2);
  }
  elseif (preg_match('/^[0-9a-f]{4}$/i', $hex)) {

    // 'FA37' is the same as 'FFAA3377' so r=FF, g=AA, b=33, a=77
    $r = str_repeat($hex[0], 2);
    $g = str_repeat($hex[1], 2);
    $b = str_repeat($hex[2], 2);
    $a = str_repeat($hex[3], 2);
  }
  else {

    //error: invalide hex string, TODO: set form error..
    return FALSE;
  }
  $r = hexdec($r);
  $g = hexdec($g);
  $b = hexdec($b);
  $a = hexdec($a);
  return array(
    $r,
    $g,
    $b,
    $a,
  );
}