1 files changed, 124 insertions, 0 deletions
diff --git a/src/jogl/classes/jogamp/opengl/util/pngj/chunks/PngChunkSBIT.java b/src/jogl/classes/jogamp/opengl/util/pngj/chunks/PngChunkSBIT.java
new file mode 100644
index 000000000..6850d260d
--- /dev/null
+++ b/src/jogl/classes/jogamp/opengl/util/pngj/chunks/PngChunkSBIT.java
@@ -0,0 +1,124 @@
+package jogamp.opengl.util.pngj.chunks;
+
+import jogamp.opengl.util.pngj.ImageInfo;
+import jogamp.opengl.util.pngj.PngHelper;
+import jogamp.opengl.util.pngj.PngjException;
+
+/*
+ */
+public class PngChunkSBIT extends PngChunk {
+	// http://www.w3.org/TR/PNG/#11sBIT
+	// this chunk structure depends on the image type
+
+	// significant bits
+	private int graysb, alphasb;
+	private int redsb, greensb, bluesb;
+
+	public PngChunkSBIT(ImageInfo info) {
+		super(ChunkHelper.sBIT, info);
+	}
+
+	@Override
+	public boolean mustGoBeforeIDAT() {
+		return true;
+	}
+
+	@Override
+	public boolean mustGoBeforePLTE() {
+		return true;
+	}
+
+	private int getLen() {
+		int len = imgInfo.greyscale ? 1 : 3;
+		if (imgInfo.alpha)
+			len += 1;
+		return len;
+	}
+
+	@Override
+	public void parseFromChunk(ChunkRaw c) {
+		if (c.len != getLen())
+			throw new PngjException("bad chunk length " + c);
+		if (imgInfo.greyscale) {
+			graysb = PngHelper.readInt1fromByte(c.data, 0);
+			if (imgInfo.alpha)
+				alphasb = PngHelper.readInt1fromByte(c.data, 1);
+		} else {
+			redsb = PngHelper.readInt1fromByte(c.data, 0);
+			greensb = PngHelper.readInt1fromByte(c.data, 1);
+			bluesb = PngHelper.readInt1fromByte(c.data, 2);
+			if (imgInfo.alpha)
+				alphasb = PngHelper.readInt1fromByte(c.data, 3);
+		}
+	}
+
+	@Override
+	public ChunkRaw createChunk() {
+		ChunkRaw c = null;
+		c = createEmptyChunk(getLen(), true);
+		if (imgInfo.greyscale) {
+			c.data[0] = (byte) graysb;
+			if (imgInfo.alpha)
+				c.data[1] = (byte) alphasb;
+		} else {
+			c.data[0] = (byte) redsb;
+			c.data[1] = (byte) greensb;
+			c.data[2] = (byte) bluesb;
+			if (imgInfo.alpha)
+				c.data[3] = (byte) alphasb;
+		}
+		return c;
+	}
+
+	@Override
+	public void cloneDataFromRead(PngChunk other) {
+		PngChunkSBIT otherx = (PngChunkSBIT) other;
+		graysb = otherx.graysb;
+		redsb = otherx.redsb;
+		greensb = otherx.greensb;
+		bluesb = otherx.bluesb;
+		alphasb = otherx.alphasb;
+	}
+
+	public void setGraysb(int gray) {
+		if (!imgInfo.greyscale)
+			throw new PngjException("only greyscale images support this");
+		graysb = gray;
+	}
+
+	public int getGraysb() {
+		if (!imgInfo.greyscale)
+			throw new PngjException("only greyscale images support this");
+		return graysb;
+	}
+
+	public void setAlphasb(int a) {
+		if (!imgInfo.alpha)
+			throw new PngjException("only images with alpha support this");
+		alphasb = a;
+	}
+
+	public int getAlphasb() {
+		if (!imgInfo.alpha)
+			throw new PngjException("only images with alpha support this");
+		return alphasb;
+	}
+
+	/**
+	 * Set rgb values
+	 * 
+	 */
+	public void setRGB(int r, int g, int b) {
+		if (imgInfo.greyscale || imgInfo.indexed)
+			throw new PngjException("only rgb or rgba images support this");
+		redsb = r;
+		greensb = g;
+		bluesb = b;
+	}
+
+	public int[] getRGB() {
+		if (imgInfo.greyscale || imgInfo.indexed)
+			throw new PngjException("only rgb or rgba images support this");
+		return new int[] { redsb, greensb, bluesb };
+	}
+}