package jogamp.opengl.util.pngj.chunks; import jogamp.opengl.util.pngj.ImageInfo; import jogamp.opengl.util.pngj.PngHelperInternal; import jogamp.opengl.util.pngj.PngjException; /** * oFFs chunk. *

* see http://www.libpng.org/pub/png/spec/register/pngext-1.3.0-pdg.html#C.oFFs */ public class PngChunkOFFS extends PngChunkSingle { public final static String ID = "oFFs"; // http://www.libpng.org/pub/png/spec/register/pngext-1.3.0-pdg.html#C.oFFs private long posX; private long posY; private int units; // 0: pixel 1:micrometer public PngChunkOFFS(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) posX, c.data, 0); PngHelperInternal.writeInt4tobytes((int) posY, 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); posX = PngHelperInternal.readInt4fromBytes(chunk.data, 0); if (posX < 0) posX += 0x100000000L; posY = PngHelperInternal.readInt4fromBytes(chunk.data, 4); if (posY < 0) posY += 0x100000000L; units = PngHelperInternal.readInt1fromByte(chunk.data, 8); } @Override public void cloneDataFromRead(PngChunk other) { PngChunkOFFS otherx = (PngChunkOFFS) other; this.posX = otherx.posX; this.posY = otherx.posY; this.units = otherx.units; } /** * 0: pixel, 1:micrometer */ public int getUnits() { return units; } /** * 0: pixel, 1:micrometer */ public void setUnits(int units) { this.units = units; } public long getPosX() { return posX; } public void setPosX(long posX) { this.posX = posX; } public long getPosY() { return posY; } public void setPosY(long posY) { this.posY = posY; } }