blob: 74640746e4b965960437d3f1790d7ba44744cac9 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
package jogamp.opengl.util.pngj.chunks;
import jogamp.opengl.util.pngj.ImageInfo;
import jogamp.opengl.util.pngj.PngHelperInternal;
import jogamp.opengl.util.pngj.PngjException;
/**
* gAMA chunk.
* <p>
* see http://www.w3.org/TR/PNG/#11gAMA
*/
public class PngChunkGAMA extends PngChunkSingle {
public final static String ID = ChunkHelper.gAMA;
// http://www.w3.org/TR/PNG/#11gAMA
private double gamma;
public PngChunkGAMA(ImageInfo info) {
super(ID, info);
}
@Override
public ChunkOrderingConstraint getOrderingConstraint() {
return ChunkOrderingConstraint.BEFORE_PLTE_AND_IDAT;
}
@Override
public ChunkRaw createRawChunk() {
ChunkRaw c = createEmptyChunk(4, true);
int g = (int) (gamma * 100000 + 0.5);
PngHelperInternal.writeInt4tobytes(g, c.data, 0);
return c;
}
@Override
public void parseFromRaw(ChunkRaw chunk) {
if (chunk.len != 4)
throw new PngjException("bad chunk " + chunk);
int g = PngHelperInternal.readInt4fromBytes(chunk.data, 0);
gamma = ((double) g) / 100000.0;
}
@Override
public void cloneDataFromRead(PngChunk other) {
gamma = ((PngChunkGAMA) other).gamma;
}
public double getGamma() {
return gamma;
}
public void setGamma(double gamma) {
this.gamma = gamma;
}
}
|
