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package jogamp.opengl.util.pngj.chunks;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import jogamp.opengl.util.pngj.ImageInfo;
import jogamp.opengl.util.pngj.PngHelper;
import jogamp.opengl.util.pngj.PngjException;
public class PngChunkSPLT extends PngChunk {
// http://www.w3.org/TR/PNG/#11sPLT
private String palName;
private int sampledepth; // 8/16
private int[] palette; // 5 elements per entry
public PngChunkSPLT(ImageInfo info) {
super(ChunkHelper.sPLT, info);
}
@Override
public boolean allowsMultiple() {
return true; // allows multiple, but pallete name should be different
}
@Override
public boolean mustGoBeforeIDAT() {
return true;
}
@Override
public ChunkRaw createChunk() {
try {
ByteArrayOutputStream ba = new ByteArrayOutputStream();
ba.write(palName.getBytes(PngHelper.charsetLatin1));
ba.write(0); // separator
ba.write((byte) sampledepth);
int nentries = getNentries();
for (int n = 0; n < nentries; n++) {
for (int i = 0; i < 4; i++) {
if (sampledepth == 8)
PngHelper.writeByte(ba, (byte) palette[n * 5 + i]);
else
PngHelper.writeInt2(ba, palette[n * 5 + i]);
}
PngHelper.writeInt2(ba, palette[n * 5 + 4]);
}
byte[] b = ba.toByteArray();
ChunkRaw chunk = createEmptyChunk(b.length, false);
chunk.data = b;
return chunk;
} catch (IOException e) {
throw new PngjException(e);
}
}
@Override
public void parseFromChunk(ChunkRaw c) {
int t = -1;
for (int i = 0; i < c.data.length; i++) { // look for first zero
if (c.data[i] == 0) {
t = i;
break;
}
}
if (t <= 0 || t > c.data.length - 2)
throw new PngjException("bad sPLT chunk: no separator found");
palName = new String(c.data, 0, t, PngHelper.charsetLatin1);
sampledepth = PngHelper.readInt1fromByte(c.data, t + 1);
t += 2;
int nentries = (c.data.length - t) / (sampledepth == 8 ? 6 : 10);
palette = new int[nentries * 5];
int r, g, b, a, f, ne;
ne = 0;
for (int i = 0; i < nentries; i++) {
if (sampledepth == 8) {
r = PngHelper.readInt1fromByte(c.data, t++);
g = PngHelper.readInt1fromByte(c.data, t++);
b = PngHelper.readInt1fromByte(c.data, t++);
a = PngHelper.readInt1fromByte(c.data, t++);
} else {
r = PngHelper.readInt2fromBytes(c.data, t);
t += 2;
g = PngHelper.readInt2fromBytes(c.data, t);
t += 2;
b = PngHelper.readInt2fromBytes(c.data, t);
t += 2;
a = PngHelper.readInt2fromBytes(c.data, t);
t += 2;
}
f = PngHelper.readInt2fromBytes(c.data, t);
t += 2;
palette[ne++] = r;
palette[ne++] = g;
palette[ne++] = b;
palette[ne++] = a;
palette[ne++] = f;
}
}
@Override
public void cloneDataFromRead(PngChunk other) {
PngChunkSPLT otherx = (PngChunkSPLT) other;
palName = otherx.palName;
sampledepth = otherx.sampledepth;
palette = new int[otherx.palette.length];
System.arraycopy(otherx.palette, 0, palette, 0, palette.length);
}
public int getNentries() {
return palette.length / 5;
}
public String getPalName() {
return palName;
}
public void setPalName(String palName) {
this.palName = palName;
}
public int getSampledepth() {
return sampledepth;
}
public void setSampledepth(int sampledepth) {
this.sampledepth = sampledepth;
}
public int[] getPalette() {
return palette;
}
public void setPalette(int[] palette) {
this.palette = palette;
}
}
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