libjava/classpath/gnu/java/awt/peer/x/ZPixmapDataBuffer.java

   1 package gnu.java.awt.peer.x;
   2
   3 import gnu.x11.Display;
   4 import gnu.x11.image.ZPixmap;
   5
   6 import java.awt.GraphicsEnvironment;
   7 import java.awt.image.DataBuffer;
   8
   9 /**
  10  * A DataBuffer implementation that is based on a ZPixmap. This is used
  11  * as backing store for BufferedImages.
  12  */
  13 class ZPixmapDataBuffer
  14   extends DataBuffer
  15 {
  16
  17   /**
  18    * The backing ZPixmap.
  19    */
  20   private ZPixmap zpixmap;
  21
  22   /**
  23    * Creates a new ZPixmapDataBuffer with a specified width and height.
  24    *
  25    * @param d the X display
  26    * @param w the width
  27    * @param h the height
  28    */
  29   ZPixmapDataBuffer(int w, int h)
  30   {
  31     super(TYPE_BYTE, w * h * 3); // TODO: Support non-24-bit-resolutions.
  32     GraphicsEnvironment env =
  33       GraphicsEnvironment.getLocalGraphicsEnvironment();
  34     XGraphicsDevice dev = (XGraphicsDevice) env.getDefaultScreenDevice();
  35     Display d = dev.getDisplay();
  36     zpixmap = new ZPixmap(d, w, h, d.default_pixmap_format);
  37   }
  38
  39   /**
  40    * Creates a ZPixmapDataBuffer from an existing ZPixmap.
  41    *
  42    * @param zpixmap the ZPixmap to wrap
  43    */
  44   ZPixmapDataBuffer(ZPixmap zpixmap)
  45   {
  46     super(TYPE_BYTE, zpixmap.get_data_length());
  47     this.zpixmap = zpixmap;
  48   }
  49
  50   @Override
  51   public int getElem(int bank, int i)
  52   {
  53     return 0xff & zpixmap.get_data_element(i);
  54   }
  55
  56   @Override
  57   public void setElem(int bank, int i, int val)
  58   {
  59     zpixmap.set_data_element(i, (byte) val);
  60   }
  61
  62   ZPixmap getZPixmap()
  63   {
  64     return zpixmap;
  65   }
  66
  67 }