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package jogamp.opengl.util.pngj.chunks;
import jogamp.opengl.util.pngj.ImageInfo;
import jogamp.opengl.util.pngj.PngHelperInternal;
import jogamp.opengl.util.pngj.PngjException;
/**
* sBIT chunk.
* <p>
* see http://www.w3.org/TR/PNG/#11sBIT
* <p>
* this chunk structure depends on the image type
*/
public class PngChunkSBIT extends PngChunkSingle {
public final static String ID = ChunkHelper.sBIT;
// http://www.w3.org/TR/PNG/#11sBIT
// significant bits
private int graysb, alphasb;
private int redsb, greensb, bluesb;
public PngChunkSBIT(ImageInfo info) {
super(ID, info);
}
@Override
public ChunkOrderingConstraint getOrderingConstraint() {
return ChunkOrderingConstraint.BEFORE_PLTE_AND_IDAT;
}
private int getLen() {
int len = imgInfo.greyscale ? 1 : 3;
if (imgInfo.alpha)
len += 1;
return len;
}
@Override
public void parseFromRaw(ChunkRaw c) {
if (c.len != getLen())
throw new PngjException("bad chunk length " + c);
if (imgInfo.greyscale) {
graysb = PngHelperInternal.readInt1fromByte(c.data, 0);
if (imgInfo.alpha)
alphasb = PngHelperInternal.readInt1fromByte(c.data, 1);
} else {
redsb = PngHelperInternal.readInt1fromByte(c.data, 0);
greensb = PngHelperInternal.readInt1fromByte(c.data, 1);
bluesb = PngHelperInternal.readInt1fromByte(c.data, 2);
if (imgInfo.alpha)
alphasb = PngHelperInternal.readInt1fromByte(c.data, 3);
}
}
@Override
public ChunkRaw createRawChunk() {
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 };
}
}
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