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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;
/**
* tRNS chunk.
* <p>
* see http://www.w3.org/TR/PNG/#11tRNS
* <p>
* this chunk structure depends on the image type
*/
public class PngChunkTRNS extends PngChunkSingle {
public final static String ID = ChunkHelper.tRNS;
// http://www.w3.org/TR/PNG/#11tRNS
// only one of these is meaningful, depending on the image type
private int gray;
private int red, green, blue;
private int[] paletteAlpha = new int[] {};
public PngChunkTRNS(ImageInfo info) {
super(ID, info);
}
@Override
public ChunkOrderingConstraint getOrderingConstraint() {
return ChunkOrderingConstraint.AFTER_PLTE_BEFORE_IDAT;
}
@Override
public ChunkRaw createRawChunk() {
ChunkRaw c = null;
if (imgInfo.greyscale) {
c = createEmptyChunk(2, true);
PngHelperInternal.writeInt2tobytes(gray, c.data, 0);
} else if (imgInfo.indexed) {
c = createEmptyChunk(paletteAlpha.length, true);
for (int n = 0; n < c.len; n++) {
c.data[n] = (byte) paletteAlpha[n];
}
} else {
c = createEmptyChunk(6, true);
PngHelperInternal.writeInt2tobytes(red, c.data, 0);
PngHelperInternal.writeInt2tobytes(green, c.data, 0);
PngHelperInternal.writeInt2tobytes(blue, c.data, 0);
}
return c;
}
@Override
public void parseFromRaw(ChunkRaw c) {
if (imgInfo.greyscale) {
gray = PngHelperInternal.readInt2fromBytes(c.data, 0);
} else if (imgInfo.indexed) {
int nentries = c.data.length;
paletteAlpha = new int[nentries];
for (int n = 0; n < nentries; n++) {
paletteAlpha[n] = (int) (c.data[n] & 0xff);
}
} else {
red = PngHelperInternal.readInt2fromBytes(c.data, 0);
green = PngHelperInternal.readInt2fromBytes(c.data, 2);
blue = PngHelperInternal.readInt2fromBytes(c.data, 4);
}
}
@Override
public void cloneDataFromRead(PngChunk other) {
PngChunkTRNS otherx = (PngChunkTRNS) other;
gray = otherx.gray;
red = otherx.red;
green = otherx.green;
blue = otherx.blue;
if (otherx.paletteAlpha != null) {
paletteAlpha = new int[otherx.paletteAlpha.length];
System.arraycopy(otherx.paletteAlpha, 0, paletteAlpha, 0, paletteAlpha.length);
}
}
/**
* 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 };
}
public void setGray(int g) {
if (!imgInfo.greyscale)
throw new PngjException("only grayscale images support this");
gray = g;
}
public int getGray() {
if (!imgInfo.greyscale)
throw new PngjException("only grayscale images support this");
return gray;
}
/**
* WARNING: non deep copy
*/
public void setPalletteAlpha(int[] palAlpha) {
if (!imgInfo.indexed)
throw new PngjException("only indexed images support this");
paletteAlpha = palAlpha;
}
/**
* to use when only one pallete index is set as totally transparent
*/
public void setIndexEntryAsTransparent(int palAlphaIndex) {
if (!imgInfo.indexed)
throw new PngjException("only indexed images support this");
paletteAlpha = new int[] { palAlphaIndex + 1 };
for (int i = 0; i < palAlphaIndex; i++)
paletteAlpha[i] = 255;
paletteAlpha[palAlphaIndex] = 0;
}
/**
* WARNING: non deep copy
*/
public int[] getPalletteAlpha() {
return paletteAlpha;
}
}
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