Implement lossless cropping interface in Java

2011-03-04 10:13:59 +00:00
parent 91332307b5
commit 89d167655e
6 changed files with 337 additions and 10 deletions
--- a/java/org/libjpegturbo/turbojpeg/TJTransformer.java
+++ b/java/org/libjpegturbo/turbojpeg/TJTransformer.java
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C)2011 D. R. Commander.  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.
+ * - Neither the name of the libjpeg-turbo Project nor the names of its
+ *   contributors may be used to endorse or promote products derived from this
+ *   software without specific prior written permission.
+ *
+ * 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 HOLDERS 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.
+ */
+
+package org.libjpegturbo.turbojpeg;
+
+public class TJTransformer extends TJDecompressor {
+
+  public TJTransformer() throws Exception {
+    init();
+  }
+
+  public TJTransformer(byte[] buf) throws Exception {
+    init();
+    setJPEGBuffer(buf, buf.length);
+  }
+
+  public TJTransformer(byte[] buf, int bufSize) throws Exception {
+    init();
+    setJPEGBuffer(buf, bufSize);
+  }
+
+  public void transform(byte[][] dstBufs, TJTransform[] transforms,
+    int flags) throws Exception {
+    if(jpegBuf == null) throw new Exception("JPEG buffer not initialized");
+    transformedSizes = transform(jpegBuf, jpegBufSize, dstBufs, transforms,
+      flags);
+  }
+
+  public TJDecompressor[] transform(TJTransform[] transforms, int flags)
+    throws Exception {
+    byte[][] dstBufs = new byte[transforms.length][];
+    if(jpegWidth < 1 || jpegHeight < 1)
+      throw new Exception("JPEG buffer not initialized");
+    for(int i = 0; i < transforms.length; i++) {
+      int w = jpegWidth, h = jpegHeight;
+      if((transforms[i].options & TJ.XFORM_CROP) != 0) {
+        if(transforms[i].width != 0) w = transforms[i].width;
+        if(transforms[i].height != 0) h = transforms[i].height;
+      }
+      dstBufs[i] = new byte[TJ.bufSize(w, h)];
+    }
+    TJDecompressor[] tjd = new TJDecompressor[transforms.length];
+    transform(dstBufs, transforms, flags);
+    for(int i = 0; i < transforms.length; i++)
+      tjd[i] = new TJDecompressor(dstBufs[i], transformedSizes[i]);
+	  return tjd;
+  }
+
+  public int[] getTransformedSizes() throws Exception {
+    if(transformedSizes == null)
+      throw new Exception("No image has been transformed yet");
+    return transformedSizes;
+  }
+
+  private native void init() throws Exception;
+
+  private native int[] transform(byte[] srcBuf, int srcSize, byte[][] dstBufs,
+    TJTransform[] transforms, int flags) throws Exception;
+
+  static {
+    System.loadLibrary("turbojpeg");
+  }
+
+  private int[] transformedSizes = null;
+};