Letterbox图像并用另一个图像填充空白空间

Question

我目前使用GD php库来缩放一些图像的信箱风格，并用黑色填充产生的空白空间。然而，我需要使用另一个图像文件中的模式来填充空白区域。任何想法如何做到这一点？

这是我使用的缩放图像的代码：

function resize_image($source_image, $destination_width, $destination_height, $type = 0) { 
    // $type (1=crop to fit, 2=letterbox) 
    $source_width = imagesx($source_image); 
    $source_height = imagesy($source_image); 
    $source_ratio = $source_width/$source_height; 
    $destination_ratio = $destination_width/$destination_height; 
    if ($type == 1) { 
     // crop to fit 
     if ($source_ratio > $destination_ratio) { 
      // source has a wider ratio 
      $temp_width = (int)($source_height * $destination_ratio); 
      $temp_height = $source_height; 
      $source_x = (int)(($source_width - $temp_width)/2); 
      $source_y = 0; 
     } else { 
      // source has a taller ratio 
      $temp_width = $source_width; 
      $temp_height = (int)($source_width/$destination_ratio); 
      $source_x = 0; 
      $source_y = (int)(($source_height - $temp_height)/2); 
     } 
     $destination_x = 0; 
     $destination_y = 0; 
     $source_width = $temp_width; 
     $source_height = $temp_height; 
     $new_destination_width = $destination_width; 
     $new_destination_height = $destination_height; 
    } else { 
     // letterbox 
     if ($source_ratio < $destination_ratio) { 
      // source has a taller ratio 
      $temp_width = (int)($destination_height * $source_ratio); 
      $temp_height = $destination_height; 
      $destination_x = (int)(($destination_width - $temp_width)/2); 
      $destination_y = 0; 
     } else { 
      // source has a wider ratio 
      $temp_width = $destination_width; 
      $temp_height = (int)($destination_width/$source_ratio); 
      $destination_x = 0; 
      $destination_y = (int)(($destination_height - $temp_height)/2); 
     } 
     $source_x = 0; 
     $source_y = 0; 
     $new_destination_width = $temp_width; 
     $new_destination_height = $temp_height; 
    } 
    $destination_image = imagecreatetruecolor($destination_width, $destination_height); 
    if ($type > 1) { 
     imagefill($destination_image, 0, 0, imagecolorallocate($destination_image, 0, 0, 0)); 
    } 
    imagecopyresampled($destination_image, $source_image, $destination_x, $destination_y, $source_x, $source_y, $new_destination_width, $new_destination_height, $source_width, $source_height); 
    return $destination_image; 
} 

谢谢

编辑------------------

我现在用这个代码工作完美，使用方法如下建议：

 $destination_image = imagecreatetruecolor($destination_width, $destination_height); 

    if ($type > 1) { 
     if ($pattern != NULL) { 
      $pattern = imagecreatefrompng($pattern); 
      imagesettile($destination_image, $pattern); 
      imagefill($destination_image, 0, 0, IMG_COLOR_TILED); 
     } else { 
      imagefill($destination_image, 0, 0, imagecolorallocate($destination_image, 0, 0, 0)); 
     } 
    } 
    imagecopyresampled($destination_image, $source_image, $destination_x, $destination_y, $source_x, $source_y, $new_destination_width, $new_destination_height, $source_width, $source_height); 
    return $destination_image; 

$模式是文件路径的背景我法师填写信箱！

Answer 1

首先准备的背景imagesettile()以创建平铺画布覆盖您的信箱上，然后使用source_x/Y/W/H的imagecopy()或imagecopyresampled()参数图像的信箱部分复制到该资源。