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<?php



$tiles = array();

$tiles[] = array("mapId"=>1 );

$tiles[] = array("mapId"=>2 );

//$tiles[] = array("mapId"=>3 );



recreateTileFile(1, $tiles);



function recreateTileFile($excludeMapId, $mergedTiles){

  $destIm = false;

  $im = false;

$count = 1;

  foreach($mergedTiles as $tile){

    if( $tile["mapId"] != $excludeMapId){

      echo "Handle ".$tile["mapId"]."\n";



      if( $destIm ){

        echo "Merge\n";

        $n = $tile["mapId"]."_img.png";

        echo "Create img from $n, save debug $count\n";

        $im = imagecreatefrompng($n);

        imagepng($im, $count."_debug.png");

        

        imagecopymerge_alpha($destIm, $im, 0,0, 0,0, 266,266,100);

        imagepng($im, (++$count)."_debug.png");

        echo "After merge, save im to debug $count\n";



        imagepng($destIm, (++$count)."_debug.png"); 

        echo "After merge, save destIm to debug $count\n";



        echo "Done merge\n";

      }

      else{

        echo "No dest, create first from ".$tile["mapId"]."\n";

        $destIm = imagecreatefrompng($tile["mapId"]."_img.png");

        echo "Save debug $count\n";

        imagepng($destIm, $count."_debug.png");

      }

    }

    $count++;

    if($im){

      imagedestroy($im);

    }



  }



  echo "Destroy and save recreated\n";

  imagepng($destIm, "recreated_img.png");

  imagedestroy($destIm);

}



function imagecopymerge_alpha($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $pct){

    if(!isset($pct)){

        return false;

    }

    $pct /= 100;

    // Get image width and height

    $w = imagesx( $src_im );

    $h = imagesy( $src_im );

    // Turn alpha blending off

    imagealphablending( $src_im, false );

    // Find the most opaque pixel in the image (the one with the smallest alpha value)

    $minalpha = 127;

    for( $x = 0; $x < $w; $x++ )

    for( $y = 0; $y < $h; $y++ ){

        $alpha = ( imagecolorat( $src_im, $x, $y ) >> 24 ) & 0xFF;

        if( $alpha < $minalpha ){

            $minalpha = $alpha;

        }

    }

    //loop through image pixels and modify alpha for each

    for( $x = 0; $x < $w; $x++ ){

        for( $y = 0; $y < $h; $y++ ){

            //get current alpha value (represents the TANSPARENCY!)

            $colorxy = imagecolorat( $src_im, $x, $y );

            $alpha = ( $colorxy >> 24 ) & 0xFF;

            //calculate new alpha

            if( $minalpha !== 127 ){

                $alpha = 127 + 127 * $pct * ( $alpha - 127 ) / ( 127 - $minalpha );

            } else {

                $alpha += 127 * $pct;

            }

            //get the color index with new alpha

            $alphacolorxy = imagecolorallocatealpha( $src_im, ( $colorxy >> 16 ) & 0xFF, ( $colorxy >> 8 ) & 0xFF, $colorxy & 0xFF, $alpha );

            //set pixel with the new color + opacity

            if( !imagesetpixel( $src_im, $x, $y, $alphacolorxy ) ){

                return false;

            }

        }

    }

    // The image copy

    imagecopy($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h);

} 

?>