115 lines
2.7 KiB
Java
115 lines
2.7 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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* bKGD Chunk.
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* <p>
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* see {@link http://www.w3.org/TR/PNG/#11bKGD}
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* <p>
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* This chunk structure depends on the image type
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*/
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public class PngChunkBKGD extends PngChunkSingle {
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public final static String ID = ChunkHelper.bKGD;
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// only one of these is meaningful
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private int gray;
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private int red;
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private int green;
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private int blue;
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private int paletteIndex;
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public PngChunkBKGD(ImageInfo info) {
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super(ChunkHelper.bKGD, info);
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}
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@Override
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public ChunkOrderingConstraint getOrderingConstraint() {
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return ChunkOrderingConstraint.AFTER_PLTE_BEFORE_IDAT;
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}
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@Override
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public ChunkRaw createRawChunk() {
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ChunkRaw c = null;
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if (imgInfo.greyscale) {
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c = createEmptyChunk(2, true);
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PngHelperInternal.writeInt2tobytes(gray, c.data, 0);
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} else if (imgInfo.indexed) {
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c = createEmptyChunk(1, true);
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c.data[0] = (byte) paletteIndex;
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} else {
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c = createEmptyChunk(6, true);
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PngHelperInternal.writeInt2tobytes(red, c.data, 0);
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PngHelperInternal.writeInt2tobytes(green, c.data, 0);
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PngHelperInternal.writeInt2tobytes(blue, c.data, 0);
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}
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return c;
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}
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@Override
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public void parseFromRaw(ChunkRaw c) {
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if (imgInfo.greyscale) {
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gray = PngHelperInternal.readInt2fromBytes(c.data, 0);
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} else if (imgInfo.indexed) {
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paletteIndex = (int) (c.data[0] & 0xff);
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} else {
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red = PngHelperInternal.readInt2fromBytes(c.data, 0);
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green = PngHelperInternal.readInt2fromBytes(c.data, 2);
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blue = PngHelperInternal.readInt2fromBytes(c.data, 4);
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}
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}
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/**
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* Set gray value (0-255 if bitdept=8)
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*
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* @param gray
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*/
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public void setGray(int gray) {
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if (!imgInfo.greyscale)
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throw new PngjException("only gray images support this");
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this.gray = gray;
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}
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public int getGray() {
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if (!imgInfo.greyscale)
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throw new PngjException("only gray images support this");
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return gray;
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}
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/**
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* Set pallette index
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*
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*/
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public void setPaletteIndex(int i) {
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if (!imgInfo.indexed)
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throw new PngjException("only indexed (pallete) images support this");
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this.paletteIndex = i;
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}
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public int getPaletteIndex() {
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if (!imgInfo.indexed)
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throw new PngjException("only indexed (pallete) images support this");
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return paletteIndex;
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}
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/**
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* Set rgb values
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*
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*/
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public void setRGB(int r, int g, int b) {
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if (imgInfo.greyscale || imgInfo.indexed)
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throw new PngjException("only rgb or rgba images support this");
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red = r;
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green = g;
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blue = b;
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}
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public int[] getRGB() {
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if (imgInfo.greyscale || imgInfo.indexed)
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throw new PngjException("only rgb or rgba images support this");
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return new int[] { red, green, blue };
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}
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}
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