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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;
/**
* pHYs chunk.
* <p>
* see http://www.w3.org/TR/PNG/#11pHYs
*/
public class PngChunkPHYS extends PngChunkSingle {
public final static String ID = ChunkHelper.pHYs;
// http://www.w3.org/TR/PNG/#11pHYs
private long pixelsxUnitX;
private long pixelsxUnitY;
private int units; // 0: unknown 1:metre
public PngChunkPHYS(ImageInfo info) {
super(ID, info);
}
@Override
public ChunkOrderingConstraint getOrderingConstraint() {
return ChunkOrderingConstraint.BEFORE_IDAT;
}
@Override
public ChunkRaw createRawChunk() {
ChunkRaw c = createEmptyChunk(9, true);
PngHelperInternal.writeInt4tobytes((int) pixelsxUnitX, c.data, 0);
PngHelperInternal.writeInt4tobytes((int) pixelsxUnitY, c.data, 4);
c.data[8] = (byte) units;
return c;
}
@Override
public void parseFromRaw(ChunkRaw chunk) {
if (chunk.len != 9)
throw new PngjException("bad chunk length " + chunk);
pixelsxUnitX = PngHelperInternal.readInt4fromBytes(chunk.data, 0);
if (pixelsxUnitX < 0)
pixelsxUnitX += 0x100000000L;
pixelsxUnitY = PngHelperInternal.readInt4fromBytes(chunk.data, 4);
if (pixelsxUnitY < 0)
pixelsxUnitY += 0x100000000L;
units = PngHelperInternal.readInt1fromByte(chunk.data, 8);
}
@Override
public void cloneDataFromRead(PngChunk other) {
PngChunkPHYS otherx = (PngChunkPHYS) other;
this.pixelsxUnitX = otherx.pixelsxUnitX;
this.pixelsxUnitY = otherx.pixelsxUnitY;
this.units = otherx.units;
}
public long getPixelsxUnitX() {
return pixelsxUnitX;
}
public void setPixelsxUnitX(long pixelsxUnitX) {
this.pixelsxUnitX = pixelsxUnitX;
}
public long getPixelsxUnitY() {
return pixelsxUnitY;
}
public void setPixelsxUnitY(long pixelsxUnitY) {
this.pixelsxUnitY = pixelsxUnitY;
}
public int getUnits() {
return units;
}
public void setUnits(int units) {
this.units = units;
}
// special getters / setters
/**
* returns -1 if the physicial unit is unknown, or X-Y are not equal
*/
public double getAsDpi() {
if (units != 1 || pixelsxUnitX != pixelsxUnitY)
return -1;
return ((double) pixelsxUnitX) * 0.0254;
}
/**
* returns -1 if the physicial unit is unknown
*/
public double[] getAsDpi2() {
if (units != 1)
return new double[] { -1, -1 };
return new double[] { ((double) pixelsxUnitX) * 0.0254, ((double) pixelsxUnitY) * 0.0254 };
}
public void setAsDpi(double dpi) {
units = 1;
pixelsxUnitX = (long) (dpi / 0.0254 + 0.5);
pixelsxUnitY = pixelsxUnitX;
}
public void setAsDpi2(double dpix, double dpiy) {
units = 1;
pixelsxUnitX = (long) (dpix / 0.0254 + 0.5);
pixelsxUnitY = (long) (dpiy / 0.0254 + 0.5);
}
}
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