将 TexturePacker 导出的 json 格式 atlas 拆分

TextureSpliter.php

<?php

/**
 * 将 TexturePacker 导出的 json 格式 atlas 拆分
 */

function spliter($filename) {
  $assetFolder = __DIR__;
  $destFolder = $assetFolder;
  $frames = json_decode(file_get_contents($assetFolder ."/$filename.txt"), true);
  if(!$frames) {
    die('Cannot open frames file');
  }
  $frames = $frames['frames'];
  $im = imagecreatefrompng($assetFolder."/$filename.png");
  foreach($frames as $name => $frame) {
    $rect = $frame['frame'];
    if(!$frame['rotated']) {
      $rect['width'] = $rect['w'];
      $rect['height'] = $rect['h'];
    } else {
      $rect['width'] = $rect['h'];
      $rect['height'] = $rect['w'];
    }
    $im2 = imagecrop($im, $rect);
    if ($im2) {
      if($frame['rotated']) {
        $im2 = imagerotate($im2, 90, imagecolorallocatealpha( $im2, 0, 0, 0, 127 ));
        imagesavealpha($im2, true);
      }
      if(!file_exists("$destFolder/$filename")) {
        mkdir("$destFolder/$filename");
      }
      imagepng($im2, "$destFolder/$filename/$name");
      // if(strpos($name, '001.') > 0) {
      //   imagepng($im2, "$destFolder/chat_faces/$filename.png");
      // }
    }
    imagedestroy($im2);
  }
  imagedestroy($im);
  echo "Processed $filename\n";
}

foreach(range(0, 29) as $i) {
  spliter("chat_face_$i");
}