function imagecache_actions_hex2rgba in ImageCache Actions 7

Same name and namespace in other branches

1. 8 utility.inc \imagecache_actions_hex2rgba()
2. 6.2 utility.inc \imagecache_actions_hex2rgba()

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

Stolen from imageapi D6 2011-01

Parameters

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

Return value

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

9 calls to imagecache_actions_hex2rgba()

canvasactions_definecanvas_effect in canvasactions/canvasactions.inc

Image effect callback for the define canvas effect.

coloractions_alpha_effect in coloractions/transparency.inc

Image effect callback for the alpha effect.

coloractions_colormultiply_effect in coloractions/imagecache_coloractions.module

Image effect callback for the color multiply effect.

coloractions_coloroverlay_effect in coloractions/imagecache_coloractions.module

Image effect callback for the color overlay effect.

coloractions_colorshift_effect in coloractions/imagecache_coloractions.module

Image effect callback for the color shift effect.

... See full list

File

./utility.inc, line 451

utility.inc: uitility form, conversion and rendering functions for image processing.

Code

function imagecache_actions_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: invalid hex string, @todo: set form error.
    return FALSE;
  }
  $r = hexdec($r);
  $g = hexdec($g);
  $b = hexdec($b);
  $a = hexdec($a);

  // Alpha over 127 is illegal. assume they meant half that.
  if ($a > 127) {
    $a = (int) $a / 2;
  }
  return array(
    'red' => $r,
    'green' => $g,
    'blue' => $b,
    'alpha' => $a,
  );
}