From 89679faa47dcab8d4ad73c49038f233665f6d44b Mon Sep 17 00:00:00 2001
From: Andreas Fitzek <andreas.fitzek@iaik.tugraz.at>
Date: Thu, 15 May 2014 12:46:16 +0200
Subject: Fixing GIF inclusion
---
.../at/gv/egiz/pdfas/common/utils/ImageUtils.java | 69 ++++++++++++++++++++++
1 file changed, 69 insertions(+)
create mode 100644 pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/utils/ImageUtils.java
(limited to 'pdf-as-common/src/main/java/at/gv')
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);
+ }
+}
--
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