1 files changed, 69 insertions, 0 deletions
diff --git a/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/utils/ImageUtils.java b/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/utils/ImageUtils.java
new file mode 100644
index 00000000..c5279100
--- /dev/null
+++ b/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/utils/ImageUtils.java
@@ -0,0 +1,69 @@
+package at.gv.egiz.pdfas.common.utils;
+
+import java.awt.AlphaComposite;
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.image.BufferedImage;
+import java.awt.image.ColorModel;
+import java.awt.image.IndexColorModel;
+import java.awt.image.WritableRaster;
+
+public class ImageUtils {
+	
+	public static BufferedImage removeAlphaChannel(BufferedImage src) {
+		if (src.getColorModel().hasAlpha())
+        {
+            // extract the alpha information
+           // WritableRaster alphaRaster = src.
+            //ColorModel cm = new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_GRAY), 
+            //        false, false, Transparency.OPAQUE, DataBuffer.TYPE_BYTE);
+            //alpha = new BufferedImage(cm, alphaRaster, false, null);
+            // create a RGB image without alpha
+            
+            BufferedImage image = new BufferedImage(src.getWidth(), src.getHeight(), BufferedImage.TYPE_INT_RGB);
+            Graphics2D g = image.createGraphics();
+            g.setComposite(AlphaComposite.Src);
+            g.drawImage(src, 0, 0, null);
+            g.dispose();
+            return image;
+        }
+		return src;
+	}
+	
+	public static BufferedImage convertRGBAToIndexed(BufferedImage src) {
+		BufferedImage dest = new BufferedImage(src.getWidth(), src.getHeight(),
+				BufferedImage.TYPE_BYTE_INDEXED);
+		Graphics g = dest.getGraphics();
+		g.setColor(new Color(231, 20, 189));
+		g.fillRect(0, 0, dest.getWidth(), dest.getHeight()); // fill with a
+																// hideous color
+																// and make it
+																// transparent
+		dest = makeTransparent(dest, 0, 0);
+		dest.createGraphics().drawImage(src, 0, 0, null);
+		return dest;
+	}
+
+	public static BufferedImage makeTransparent(BufferedImage image, int x,
+			int y) {
+		ColorModel cm = image.getColorModel();
+		if (!(cm instanceof IndexColorModel))
+			return image; // sorry...
+		IndexColorModel icm = (IndexColorModel) cm;
+		WritableRaster raster = image.getRaster();
+		int pixel = raster.getSample(x, y, 0); // pixel is offset in ICM's
+												// palette
+		int size = icm.getMapSize();
+		byte[] reds = new byte[size];
+		byte[] greens = new byte[size];
+		byte[] blues = new byte[size];
+		icm.getReds(reds);
+		icm.getGreens(greens);
+		icm.getBlues(blues);
+		IndexColorModel icm2 = new IndexColorModel(8, size, reds, greens,
+				blues, pixel);
+		return new BufferedImage(icm2, raster, image.isAlphaPremultiplied(),
+				null);
+	}
+}