createRGBArray.php

<?php

function getBestSkip($totalPixels, $imageSizes) {
  $toReturn = 0;
  foreach($imageSizes as $arr) { // => $array) {
    // var_dump($arr);
    if ($arr["Pixels"] >= $totalPixels) {
      // echo $arr["skipSize"];
      return $toReturn * 3; // $arr["skipSize"]; TODO
    } else {
      $toReturn = $arr["skipSize"];
    }
    // echo ($toReturn);
    // echo "<br>";
  }
  return 25;
}

/*
 * Returns an image php object to pass to createRGBArray method
 */
function getImageFromURL($url) {
  if (strlen($url) == 0) {
      return;
  }
  $urlArray = explode(".", $url);
  $image = null;
  switch ($urlArray[count($urlArray) - 1]) {
      case 'png':
          $image = imagecreatefrompng($url);
          break;
      case 'jpeg':
          $image = imagecreatefromjpeg($url);
          break;
      case 'png':
          $image = imagecreatefrompng($url);
          break;
      case 'gif':
          $image = imagecreatefromgif($url);
          break;
      case 'bmp':
          $image = imagecreatefrombmp($url);
          break;
      case 'xbm':
          $image = imagecreatefromxbm($url);
          break;
      default:
          $imageTry = imagepng(
              imagecreatefromstring(file_get_contents($url)),
              "temp"
          );
          if ($imageTry != null && $imageTry != false) {
              $image = imagecreatefrompng("temp");
          }
          break;
  }
  if ($image == null) {
      echo "\nalert(\"file type not supported at this time!\");</script>";
      die();
  }
  return $image;
}

function getImageWidth($image) {
  return imagesx($image);
}

function getImageHeight($image) {
  return imagesy($image);
}

function getTotalPixels($image) {
  return getImageWidth($image) * getImageHeight($image);
}

/**
 * Creates the array of rgb values based on the given url in JavaScript form.
 **/
function createRGBArray($image, $skipSize) {
    $width = imagesx($image);
    $height = imagesy($image);

    // $skipSize = 2; //TODO : A function to automate this number to be as low as possible.

    //($width >= $height ? $height : $height) / 50;
    $newWidth = $width / $skipSize; //imagesx($image);// / $skipSize; //imagesx($image)
    $newHeight = $height / $skipSize; //imagesy($image);// / $skipSize;
    $rgbArray = "const rgbArray = [";
    for ($x = 0; $x < $width; $x += $skipSize) {
        //for loop runs through each column and...
        $rgbArray = $rgbArray . "[";
        for ($y = 0; $y < $height; $y += $skipSize) {
            // each row to add rgb values.
            $rgb = imagecolorat($image, $x, $y);
            $r = ($rgb >> 16) & 0xff;
            $g = ($rgb >> 8) & 0xff;
            $b = $rgb & 0xff;
            $rgbArray =
                $rgbArray .
                "[" .
                $r .
                "," .
                $g .
                "," .
                $b .
                "]" .
                ($y + $skipSize < $height ? "," : "");
        }
        $rgbArray = $rgbArray . "]" . ($x + $skipSize < $width ? "," : "");
    }
    $rgbArray = $rgbArray . "];";
    imagedestroy($image);
    return $rgbArray;
}
?>