1 files changed, 177 insertions, 0 deletions
diff --git a/libjava/java/awt/image/DataBuffer.java b/libjava/java/awt/image/DataBuffer.java
new file mode 100644
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+++ b/libjava/java/awt/image/DataBuffer.java
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+/* Copyright © 2000  Free Software Foundation
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+package java.awt.image;
+
+/** 
+ * Class that manages arrays of data elements. A data buffer consists
+ * of one or more banks.  A bank is a continuous region of data
+ * elements.
+ *
+ * @author Rolf W. Rasmussen <rolfwr@ii.uib.no>
+ */
+public abstract class DataBuffer
+{
+  public static final int TYPE_BYTE      =  0;
+  public static final int TYPE_USHORT    =  1;
+  public static final int TYPE_SHORT     =  2;
+  public static final int TYPE_INT       =  3;
+  public static final int TYPE_FLOAT     =  4;
+  public static final int TYPE_DOUBLE    =  5;
+  public static final int TYPE_UNDEFINED = 32;
+  
+  /** The type of the data elements stored in the data buffer.  */
+  protected int dataType;
+  
+  /** The number of banks in this buffer.  */
+  protected int banks = 1;
+  
+  /** Offset into the default (0'th) bank). */
+  protected int offset; // FIXME: Is offsets[0] always mirrored in offset?
+  
+  /** The size of the banks.  */
+  protected int size;
+  
+  /** Offset into each bank.  */
+  protected int[] offsets;
+  
+  protected DataBuffer(int dataType, int size)
+  {
+    this.dataType = dataType;
+    this.size = size;
+  }
+
+  protected DataBuffer(int dataType, int size, int numBanks) {
+    this(dataType, size);
+    banks = numBanks;
+    offsets = new int[numBanks];
+  }
+
+  protected DataBuffer(int dataType, int size, int numBanks, int offset) {
+    this(dataType, size, numBanks);
+    
+    java.util.Arrays.fill(offsets, offset);          
+    
+    this.offset = offset;
+  }
+
+  protected DataBuffer(int dataType, int size, int numBanks, int[] offsets) {
+    this(dataType, size);
+    if (numBanks != offsets.length) 
+      throw new ArrayIndexOutOfBoundsException();
+    
+    banks = numBanks;
+    this.offsets = offsets;
+    
+    offset = offsets[0];
+  }
+  
+  public static int getDataTypeSize(int dataType) {
+    // Maybe this should be a lookup table instead.
+    switch (dataType)
+      {
+      case TYPE_BYTE:
+	return 8;
+      case TYPE_USHORT:
+      case TYPE_SHORT:
+	return 16;
+      case TYPE_INT:
+      case TYPE_FLOAT:
+	return 32;
+      case TYPE_DOUBLE:
+	return 64;
+      default:
+	throw new IllegalArgumentException();
+      }
+  }
+
+  public int getDataType()
+  {
+    return dataType;
+  }
+  
+  public int getSize()
+  {
+    return size;
+  }
+  
+  public int getOffset()
+  {
+    return offset;
+  }
+  
+  public int[] getOffsets()
+  {
+    if (offsets == null)
+    {
+      // is this necessary?
+      offsets = new int[1];
+      offsets[0] = offset;
+    }
+    return offsets;
+  }
+
+  public int getNumBanks()
+  {
+    return banks;
+  }
+
+  public int getElem(int i)
+  {
+    return getElem(0, i);
+  }
+
+  public abstract int getElem(int bank, int i);
+  
+  public void setElem(int i, int val)
+  {
+    setElem(0, i, val);
+  }
+
+  public abstract void setElem(int bank, int i, int val);
+  
+  public float getElemFloat(int i)
+  {
+    return getElem(i);
+  }
+    
+  public float getElemFloat(int bank, int i)
+  {
+    return getElem(bank, i);
+  }
+
+  public void setElemFloat(int i, float val)
+  {
+    setElem(i, (int) val);
+  }
+
+  public void setElemFloat(int bank, int i, float val)
+  {
+    setElem(bank, i, (int) val);
+  }
+
+  public double getElemDouble(int i)
+  {
+    return getElem(i);
+  }
+    
+  public double getElemDouble(int bank, int i)
+  {
+    return getElem(bank, i);
+  }
+
+  public void setElemDouble(int i, double val)
+  {
+    setElem(i, (int) val);
+  }
+
+  public void setElemDouble(int bank, int i, double val)
+  {
+    setElem(bank, i, (int) val);
+  }
+}