82 lines
1.7 KiB
Java
82 lines
1.7 KiB
Java
package ar.com.hjg.pngj.chunks;
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import ar.com.hjg.pngj.ImageInfo;
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import ar.com.hjg.pngj.PngHelperInternal;
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import ar.com.hjg.pngj.PngjException;
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/**
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* oFFs chunk.
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* <p>
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* see http://www.libpng.org/pub/png/spec/register/pngext-1.3.0-pdg.html#C.oFFs
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*/
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public class PngChunkOFFS extends PngChunkSingle {
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public final static String ID = "oFFs";
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// http://www.libpng.org/pub/png/spec/register/pngext-1.3.0-pdg.html#C.oFFs
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private long posX;
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private long posY;
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private int units; // 0: pixel 1:micrometer
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public PngChunkOFFS(ImageInfo info) {
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super(ID, info);
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}
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@Override
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public ChunkOrderingConstraint getOrderingConstraint() {
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return ChunkOrderingConstraint.BEFORE_IDAT;
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}
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@Override
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public ChunkRaw createRawChunk() {
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ChunkRaw c = createEmptyChunk(9, true);
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PngHelperInternal.writeInt4tobytes((int) posX, c.data, 0);
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PngHelperInternal.writeInt4tobytes((int) posY, c.data, 4);
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c.data[8] = (byte) units;
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return c;
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}
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@Override
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public void parseFromRaw(ChunkRaw chunk) {
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if (chunk.len != 9)
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throw new PngjException("bad chunk length " + chunk);
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posX = PngHelperInternal.readInt4fromBytes(chunk.data, 0);
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if (posX < 0)
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posX += 0x100000000L;
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posY = PngHelperInternal.readInt4fromBytes(chunk.data, 4);
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if (posY < 0)
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posY += 0x100000000L;
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units = PngHelperInternal.readInt1fromByte(chunk.data, 8);
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}
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/**
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* 0: pixel, 1:micrometer
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*/
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public int getUnits() {
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return units;
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}
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/**
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* 0: pixel, 1:micrometer
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*/
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public void setUnits(int units) {
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this.units = units;
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}
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public long getPosX() {
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return posX;
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}
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public void setPosX(long posX) {
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this.posX = posX;
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}
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public long getPosY() {
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return posY;
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}
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public void setPosY(long posY) {
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this.posY = posY;
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}
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}
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