+ * Subclasses can redefine it and use third-party libraries for actual rendering, + * for example, Bitmaps can be rendered using javax.imageio.* , WMF can be rendered using Apache Batik, + * PICT can be rendered using Apple QuickTime API for Java, etc. + *
+ * + * A typical usage is as follows: + *
+ * public WMFPaiter implements ImagePainter{
+ * public void paint(Graphics2D graphics, PictureData pict, Picture parent){
+ * DataInputStream is = new DataInputStream(new ByteArrayInputStream(pict.getData()));
+ * org.apache.batik.transcoder.wmf.tosvg.WMFRecordStore wmfStore =
+ * new org.apache.batik.transcoder.wmf.tosvg.WMFRecordStore();
+ * try {
+ * wmfStore.read(is);
+ * } catch (IOException e){
+ * return;
+ * }
+ *
+ * Rectangle anchor = parent.getAnchor();
+ * float scale = (float)anchor.width/wmfStore.getWidthPixels();
+ *
+ * org.apache.batik.transcoder.wmf.tosvg.WMFPainter painter =
+ * new org.apache.batik.transcoder.wmf.tosvg.WMFPainter(wmfStore, 0, 0, scale);
+ * graphics.translate(anchor.x, anchor.y);
+ * painter.paint(graphics);
+ * }
+ * }
+ * PictureData.setImagePainter(Picture.WMF, new WMFPaiter());
+ * ...
+ *
+ * Subsequenet calls of Slide.draw(Graphics gr) will use WMFPaiter for WMF images.
+ *
+ * @author Yegor Kozlov.
+ */
+public interface ImagePainter {
+
+ /**
+ * Paints the specified picture data
+ *
+ * @param graphics the graphics to paintb into
+ * @param pict the data to paint
+ * @param parent the shapes that owns the picture data
+ */
+ public void paint(Graphics2D graphics, PictureData pict, Picture parent);
+}
diff --git a/src/scratchpad/src/org/apache/poi/hslf/usermodel/PictureData.java b/src/scratchpad/src/org/apache/poi/hslf/usermodel/PictureData.java
index 02ff1d9ad..d21d098c3 100644
--- a/src/scratchpad/src/org/apache/poi/hslf/usermodel/PictureData.java
+++ b/src/scratchpad/src/org/apache/poi/hslf/usermodel/PictureData.java
@@ -17,6 +17,8 @@
package org.apache.poi.hslf.usermodel;
import org.apache.poi.util.LittleEndian;
+import org.apache.poi.util.POILogger;
+import org.apache.poi.util.POILogFactory;
import org.apache.poi.hslf.model.Picture;
import org.apache.poi.hslf.blip.*;
import org.apache.poi.hslf.exceptions.HSLFException;
@@ -25,6 +27,7 @@ import java.io.OutputStream;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
+import java.awt.*;
/**
* A class that represents image data contained in a slide show.
@@ -33,19 +36,21 @@ import java.security.NoSuchAlgorithmException;
*/
public abstract class PictureData {
+ protected POILogger logger = POILogFactory.getLogger(this.getClass());
+
/**
* Size of the image checksum calculated using MD5 algorithm.
*/
protected static final int CHECKSUM_SIZE = 16;
- /**
- * Binary data of the picture
- */
+ /**
+ * Binary data of the picture
+ */
private byte[] rawdata;
- /**
- * The offset to the picture in the stream
- */
- protected int offset;
+ /**
+ * The offset to the picture in the stream
+ */
+ protected int offset;
/**
* Returns type of this picture.
@@ -71,6 +76,13 @@ public abstract class PictureData {
*/
protected abstract int getSignature();
+ protected static ImagePainter[] painters = new ImagePainter[8];
+ static {
+ PictureData.setImagePainter(Picture.PNG, new BitmapPainter());
+ PictureData.setImagePainter(Picture.JPEG, new BitmapPainter());
+ PictureData.setImagePainter(Picture.DIB, new BitmapPainter());
+ }
+
/**
* Returns the raw binary data of this Picture excluding the first 8 bytes
* which hold image signature and size of the image data.
@@ -212,4 +224,30 @@ public abstract class PictureData {
return getData().length;
}
+ public void draw(Graphics2D graphics, Picture parent){
+ ImagePainter painter = painters[getType()];
+ if(painter != null) painter.paint(graphics, this, parent);
+ else logger.log(POILogger.WARN, "Rendering is not supported: " + getClass().getName());
+ }
+
+ /**
+ * Register ImagePainter for the specified image type
+ *
+ * @param type image type, must be one of the static constants defined in the Picture class.
+ * @param painter
+ */
+ public static void setImagePainter(int type, ImagePainter painter){
+ painters[type] = painter;
+ }
+
+ /**
+ * Return ImagePainter for the specified image type
+ *
+ * @param type blip type, must be one of the static constants defined in the Picture class.
+ * @return ImagePainter for the specified image type
+ */
+ public static ImagePainter getImagePainter(int type){
+ return painters[type];
+ }
+
}
diff --git a/src/scratchpad/testcases/org/apache/poi/hslf/model/TestImagePainter.java b/src/scratchpad/testcases/org/apache/poi/hslf/model/TestImagePainter.java
new file mode 100755
index 000000000..d10dd1353
--- /dev/null
+++ b/src/scratchpad/testcases/org/apache/poi/hslf/model/TestImagePainter.java
@@ -0,0 +1,57 @@
+/* ====================================================================
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements. See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You under the Apache License, Version 2.0
+ (the "License"); you may not use this file except in compliance with
+ the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+==================================================================== */
+package org.apache.poi.hslf.model;
+
+import junit.framework.*;
+
+import java.io.FileOutputStream;
+import java.io.File;
+import java.awt.*;
+
+import org.apache.poi.hslf.usermodel.SlideShow;
+import org.apache.poi.hslf.usermodel.PictureData;
+import org.apache.poi.hslf.HSLFSlideShow;
+import org.apache.poi.hslf.blip.ImagePainter;
+import org.apache.poi.hslf.blip.BitmapPainter;
+import org.apache.poi.ddf.EscherBSERecord;
+
+/**
+ * Test Picture shape.
+ *
+ * @author Yegor Kozlov
+ */
+public class TestImagePainter extends TestCase {
+
+ private static class CustomImagePainer implements ImagePainter{
+ public void paint(Graphics2D graphics, PictureData pict, Picture parent){
+ //do noting
+ }
+
+ }
+
+ public void testImagePainter() throws Exception {
+
+ ImagePainter pntr = PictureData.getImagePainter(Picture.PNG);
+ assertTrue(PictureData.getImagePainter(Picture.PNG) instanceof BitmapPainter);
+ assertTrue(PictureData.getImagePainter(Picture.JPEG) instanceof BitmapPainter);
+ assertTrue(PictureData.getImagePainter(Picture.DIB) instanceof BitmapPainter);
+
+ PictureData.setImagePainter(Picture.WMF, new CustomImagePainer());
+ assertTrue(PictureData.getImagePainter(Picture.WMF) instanceof CustomImagePainer);
+ }
+
+}