Change directory structure.

[dvibrowser/dvi2epub.git] / src / main / java / jp / sourceforge / dvibrowser / dvicore / image / pnm / PgmSplitter.java

diff --git a/src/main/java/jp/sourceforge/dvibrowser/dvicore/image/pnm/PgmSplitter.java b/src/main/java/jp/sourceforge/dvibrowser/dvicore/image/pnm/PgmSplitter.java
new file mode 100644 (file)
index 0000000..a23ecf6
--- /dev/null
+++ b/src/main/java/jp/sourceforge/dvibrowser/dvicore/image/pnm/PgmSplitter.java
@@ -0,0 +1,95 @@
+package jp.sourceforge.dvibrowser.dvicore.image.pnm;
+/*
+ * Copyright (c) 2009, Takeyuki Nagao
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the
+ * following conditions are met:
+ * 
+ *  * Redistributions of source code must retain the above
+ *    copyright notice, this list of conditions and the
+ *    following disclaimer.
+ *  * Redistributions in binary form must reproduce the above
+ *    copyright notice, this list of conditions and the
+ *    following disclaimer in the documentation and/or other
+ *    materials provided with the distribution.
+ *    
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+ * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ */
+
+import java.awt.image.BufferedImage;
+import java.awt.image.DataBufferByte;
+import java.io.InputStream;
+
+import jp.sourceforge.dvibrowser.dvicore.DviException;
+import jp.sourceforge.dvibrowser.dvicore.DviRect;
+import jp.sourceforge.dvibrowser.dvicore.DviSize;
+import jp.sourceforge.dvibrowser.dvicore.image.split.SplitImageWriter;
+
+public class PgmSplitter
+extends AbstractPnmSplitter
+{
+//  private static final Logger LOGGER = Logger.getLogger(PgmSplitter.class
+//      .getName());
+  public PgmSplitter(DviSize unitSize, SplitImageWriter imageWriter)
+  {
+    super(unitSize, imageWriter);
+  }
+  
+  private final int [] table = new int[256];
+  
+  @Override
+  protected void beginSplitInternal(PnmHeader header, InputStream is) throws DviException
+  {
+    super.beginSplitInternal(header, is);
+    int maxval = header.getMaxValue();
+    for (int i=0; i<256; i++) {
+      table[i] = Math.max(Math.min(i * maxval / 255, maxval), 0);
+    }
+  }
+  
+  @Override
+  protected byte [] createLineBuffer()
+  {
+    return new byte [header.getWidth()];
+  }
+  
+  @Override
+  protected BufferedImage createBufferedImage(DviRect box)
+  {
+    //TODO: use color model.
+    BufferedImage bi = new BufferedImage(box.width(), box.height(), BufferedImage.TYPE_BYTE_GRAY);
+    return bi;
+  }
+  
+  @Override
+  protected int copyLineToDataBuffer(final byte [] buf, final int x, final DviRect box, final int i, final DataBufferByte data)
+  {
+    final int w = box.width();
+    final int uw = w;
+    final byte [] dst = data.getData();
+    for (int j=0; j<w; j++) {
+      dst[j + i * uw] = (byte) table[byteToInt(buf[x + j])];
+    }
+    return uw;
+  }
+
+  private int byteToInt(byte b) {
+    if (b >= 0) return b;
+    return 256 + b;
+  }
+}