src/main/java/charactermanaj/graphics/io/ImageLoaderImpl.java

   1 package charactermanaj.graphics.io;\r
   2 \r
   3 import java.awt.Graphics;\r
   4 import java.awt.image.BufferedImage;\r
   5 import java.io.IOException;\r
   6 import java.io.InputStream;\r
   7 import java.sql.Timestamp;\r
   8 import java.util.logging.Level;\r
   9 import java.util.logging.Logger;\r
  10 \r
  11 import javax.imageio.ImageIO;\r
  12 \r
  13 \r
  14 /**\r
  15  * 画像を読み取ります.<br>\r
  16  * @author seraphy\r
  17  */\r
  18 public class ImageLoaderImpl implements ImageLoader {\r
  19 \r
  20         /**\r
  21          * ロガー\r
  22          */\r
  23         private static final Logger logger = Logger.getLogger(ImageLoaderImpl.class.getName());\r
  24         \r
  25         /**\r
  26          * 画像リソースからBufferedImageを返します.<br>\r
  27          * 返される形式はARGBに変換されています.<br>\r
  28          * @param imageResource 画像リソース\r
  29          * @throws IOException 読み取りに失敗した場合、もしくは画像の形式が不明な場合\r
  30          */\r
  31         public LoadedImage load(ImageResource imageResource) throws IOException {\r
  32                 if (imageResource == null) {\r
  33                         throw new IllegalArgumentException();\r
  34                 }\r
  35 \r
  36                 BufferedImage img;\r
  37                 InputStream is = imageResource.openStream();\r
  38                 try {\r
  39                         img = ImageIO.read(is);\r
  40 \r
  41                 } finally {\r
  42                         is.close();\r
  43                 }\r
  44                 if (img == null) {\r
  45                         logger.log(Level.WARNING, "unsuppoted image: " + imageResource);\r
  46                         throw new IOException("unsupported image");\r
  47                 }\r
  48                 \r
  49                 // ARGB形式でなければ変換する.\r
  50                 img = convertARGB(img);\r
  51                 \r
  52                 long lastModified = imageResource.lastModified();\r
  53 \r
  54                 if (logger.isLoggable(Level.FINE)) {\r
  55                         logger.log(Level.FINE, "load image: " + imageResource + " ;lastModified=" + new Timestamp(lastModified));\r
  56                 }\r
  57                 return new LoadedImage(img, lastModified);\r
  58         }\r
  59         \r
  60         /**\r
  61          * イメージがARGB形式でなければ、ARGB形式に変換して返す.<br>\r
  62          * そうでなければ、そのまま返す. \r
  63          * @param image イメージ\r
  64          * @return ARGB形式のイメージ\r
  65          */\r
  66         protected BufferedImage convertARGB(BufferedImage image) {\r
  67                 if (image == null) {\r
  68                         throw new IllegalArgumentException();\r
  69                 }\r
  70                 int typ = image.getType();\r
  71                 if (typ == BufferedImage.TYPE_INT_ARGB) {\r
  72                         return image;\r
  73                 }\r
  74                 // ARGB形式でなければ変換する.\r
  75                 BufferedImage img2 = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_INT_ARGB);\r
  76                 Graphics g = img2.getGraphics();\r
  77                 try {\r
  78                         g.drawImage(image, 0, 0, null);\r
  79                 } finally {\r
  80                         g.dispose();\r
  81                 }\r
  82                 return img2;\r
  83         }\r
  84 }\r