1 files changed, 46 insertions, 0 deletions
diff --git a/src/main/java/org/openslx/graph/PngRenderer.java b/src/main/java/org/openslx/graph/PngRenderer.java
new file mode 100644
index 0000000..e51889c
--- /dev/null
+++ b/src/main/java/org/openslx/graph/PngRenderer.java
@@ -0,0 +1,46 @@
+package org.openslx.graph;
+
+import java.awt.image.BufferedImage;
+import java.awt.image.DataBufferInt;
+import java.awt.image.SinglePixelPackedSampleModel;
+import java.io.OutputStream;
+
+import ar.com.hjg.pngj.ImageInfo;
+import ar.com.hjg.pngj.ImageLineByte;
+import ar.com.hjg.pngj.PngWriter;
+
+public class PngRenderer
+{
+	private final ImageInfo imageInfo;
+	private final SinglePixelPackedSampleModel samplemodel;
+	private final int[] srcImageRawData;
+	private final ImageLineByte line;
+	private final byte[] lineBytes;
+
+	public PngRenderer( BufferedImage image )
+	{
+		imageInfo = new ImageInfo( image.getWidth(), image.getHeight(), 8, false );
+		DataBufferInt db = ( (DataBufferInt)image.getRaster().getDataBuffer() );
+		samplemodel = (SinglePixelPackedSampleModel)image.getSampleModel();
+		line = new ImageLineByte( imageInfo );
+		lineBytes = line.getScanline();
+		srcImageRawData = db.getData();
+	}
+	
+	public void render( OutputStream os )
+	{
+		PngWriter pngWriter = new PngWriter( os, imageInfo );
+		for ( int row = 0; row < imageInfo.rows; row++ ) {
+			int elem = samplemodel.getOffset( 0, row );
+			for ( int col = 0, j = 0; col < imageInfo.cols; col++ ) {
+				int sample = srcImageRawData[elem++];
+				lineBytes[j++] = (byte) ( ( sample & 0xFF0000 ) >> 16 ); // R
+				lineBytes[j++] = (byte) ( ( sample & 0xFF00 ) >> 8 ); // G
+				lineBytes[j++] = (byte) ( sample & 0xFF ); // B
+			}
+			pngWriter.writeRow( line, row );
+		}
+		pngWriter.end();
+	}
+	
+}