1 files changed, 122 insertions, 0 deletions
diff --git a/src/jogl/classes/jogamp/opengl/util/pngj/chunks/PngChunkBKGD.java b/src/jogl/classes/jogamp/opengl/util/pngj/chunks/PngChunkBKGD.java
new file mode 100644
index 000000000..51bbcb832
--- /dev/null
+++ b/src/jogl/classes/jogamp/opengl/util/pngj/chunks/PngChunkBKGD.java
@@ -0,0 +1,122 @@
+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 PngChunkBKGD extends PngChunk {
+	// http://www.w3.org/TR/PNG/#11bKGD
+	// this chunk structure depends on the image type
+	// only one of these is meaningful
+	private int gray;
+	private int red, green, blue;
+	private int paletteIndex;
+
+	public PngChunkBKGD(ImageInfo info) {
+		super(ChunkHelper.bKGD, info);
+	}
+
+	@Override
+	public boolean mustGoBeforeIDAT() {
+		return true;
+	}
+
+	@Override
+	public boolean mustGoAfterPLTE() {
+		return true;
+	}
+
+	@Override
+	public ChunkRaw createChunk() {
+		ChunkRaw c = null;
+		if (imgInfo.greyscale) {
+			c = createEmptyChunk(2, true);
+			PngHelper.writeInt2tobytes(gray, c.data, 0);
+		} else if (imgInfo.indexed) {
+			c = createEmptyChunk(1, true);
+			c.data[0] = (byte) paletteIndex;
+		} else {
+			c = createEmptyChunk(6, true);
+			PngHelper.writeInt2tobytes(red, c.data, 0);
+			PngHelper.writeInt2tobytes(green, c.data, 0);
+			PngHelper.writeInt2tobytes(blue, c.data, 0);
+		}
+		return c;
+	}
+
+	@Override
+	public void parseFromChunk(ChunkRaw c) {
+		if (imgInfo.greyscale) {
+			gray = PngHelper.readInt2fromBytes(c.data, 0);
+		} else if (imgInfo.indexed) {
+			paletteIndex = (int) (c.data[0] & 0xff);
+		} else {
+			red = PngHelper.readInt2fromBytes(c.data, 0);
+			green = PngHelper.readInt2fromBytes(c.data, 2);
+			blue = PngHelper.readInt2fromBytes(c.data, 4);
+		}
+	}
+
+	@Override
+	public void cloneDataFromRead(PngChunk other) {
+		PngChunkBKGD otherx = (PngChunkBKGD) other;
+		gray = otherx.gray;
+		red = otherx.red;
+		green = otherx.red;
+		blue = otherx.red;
+		paletteIndex = otherx.paletteIndex;
+	}
+
+	/**
+	 * Set gray value (0-255 if bitdept=8)
+	 * 
+	 * @param gray
+	 */
+	public void setGray(int gray) {
+		if (!imgInfo.greyscale)
+			throw new PngjException("only gray images support this");
+		this.gray = gray;
+	}
+
+	public int getGray() {
+		if (!imgInfo.greyscale)
+			throw new PngjException("only gray images support this");
+		return gray;
+	}
+
+	/**
+	 * Set pallette index
+	 * 
+	 */
+	public void setPaletteIndex(int i) {
+		if (!imgInfo.indexed)
+			throw new PngjException("only indexed (pallete) images support this");
+		this.paletteIndex = i;
+	}
+
+	public int getPaletteIndex() {
+		if (!imgInfo.indexed)
+			throw new PngjException("only indexed (pallete) images support this");
+		return paletteIndex;
+	}
+
+	/**
+	 * 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");
+		red = r;
+		green = g;
+		blue = b;
+	}
+
+	public int[] getRGB() {
+		if (imgInfo.greyscale || imgInfo.indexed)
+			throw new PngjException("only rgb or rgba images support this");
+		return new int[] { red, green, blue };
+	}
+}