LookupOppublic class LookupOp extends Object implements BufferedImageOp, RasterOp| This class implements a lookup operation from the source
to the destination. The LookupTable object may contain a single array
or multiple arrays, subject to the restrictions below.
For Rasters, the lookup operates on bands. The number of
lookup arrays may be one, in which case the same array is
applied to all bands, or it must equal the number of Source
Raster bands.
For BufferedImages, the lookup operates on color and alpha components.
The number of lookup arrays may be one, in which case the
same array is applied to all color (but not alpha) components.
Otherwise, the number of lookup arrays may
equal the number of Source color components, in which case no
lookup of the alpha component (if present) is performed.
If neither of these cases apply, the number of lookup arrays
must equal the number of Source color components plus alpha components,
in which case lookup is performed for all color and alpha components.
This allows non-uniform rescaling of multi-band BufferedImages.
BufferedImage sources with premultiplied alpha data are treated in the same
manner as non-premultiplied images for purposes of the lookup. That is,
the lookup is done per band on the raw data of the BufferedImage source
without regard to whether the data is premultiplied. If a color conversion
is required to the destination ColorModel, the premultiplied state of
both source and destination will be taken into account for this step.
Images with an IndexColorModel cannot be used.
If a RenderingHints object is specified in the constructor, the
color rendering hint and the dithering hint may be used when color
conversion is required.
This class allows the Source to be the same as the Destination. |
| Fields Summary |
|---|
| private LookupTable | ltable | | private int | numComponents | | RenderingHints | hints |
| Constructors Summary |
|---|
public LookupOp(LookupTable lookup, RenderingHints hints)Constructs a LookupOp object given the lookup
table and a RenderingHints object, which might
be null.
this.ltable = lookup;
this.hints = hints;
numComponents = ltable.getNumComponents();
|
| Methods Summary |
|---|
| private final void | byteFilter(java.awt.image.ByteLookupTable lookup, java.awt.image.Raster src, java.awt.image.WritableRaster dst, int width, int height, int numBands)
int[] srcPix = null;
// Find the ref to the table and the offset
byte[][] table = lookup.getTable();
int offset = lookup.getOffset();
int tidx;
int step=1;
// Check if it is one lookup applied to all bands
if (table.length == 1) {
step=0;
}
int x;
int y;
int band;
int len = table[0].length;
// Loop through the data
for ( y=0; y < height; y++) {
tidx = 0;
for ( band=0; band < numBands; band++, tidx+=step) {
// Find data for this band, scanline
srcPix = src.getSamples(0, y, width, 1, band, srcPix);
for ( x=0; x < width; x++) {
int index = srcPix[x]-offset;
if (index < 0 || index > len) {
throw new
IllegalArgumentException("index ("+index+
"(out of range: "+
" srcPix["+x+
"]="+ srcPix[x]+
" offset="+ offset);
}
// Do the lookup
srcPix[x] = table[tidx][index];
}
// Put it back
dst.setSamples(0, y, width, 1, band, srcPix);
}
}
| | public java.awt.image.BufferedImage | createCompatibleDestImage(java.awt.image.BufferedImage src, java.awt.image.ColorModel destCM)Creates a zeroed destination image with the correct size and number of
bands. If destCM is null, an appropriate
ColorModel will be used.
BufferedImage image;
int w = src.getWidth();
int h = src.getHeight();
int transferType = DataBuffer.TYPE_BYTE;
if (destCM == null) {
ColorModel cm = src.getColorModel();
Raster raster = src.getRaster();
if (cm instanceof ComponentColorModel) {
DataBuffer db = raster.getDataBuffer();
boolean hasAlpha = cm.hasAlpha();
boolean isPre = cm.isAlphaPremultiplied();
int trans = cm.getTransparency();
int[] nbits = null;
if (ltable instanceof ByteLookupTable) {
if (db.getDataType() == db.TYPE_USHORT) {
// Dst raster should be of type byte
if (hasAlpha) {
nbits = new int[2];
if (trans == cm.BITMASK) {
nbits[1] = 1;
}
else {
nbits[1] = 8;
}
}
else {
nbits = new int[1];
}
nbits[0] = 8;
}
// For byte, no need to change the cm
}
else if (ltable instanceof ShortLookupTable) {
transferType = DataBuffer.TYPE_USHORT;
if (db.getDataType() == db.TYPE_BYTE) {
if (hasAlpha) {
nbits = new int[2];
if (trans == cm.BITMASK) {
nbits[1] = 1;
}
else {
nbits[1] = 16;
}
}
else {
nbits = new int[1];
}
nbits[0] = 16;
}
}
if (nbits != null) {
cm = new ComponentColorModel(cm.getColorSpace(),
nbits, hasAlpha, isPre,
trans, transferType);
}
}
image = new BufferedImage(cm,
cm.createCompatibleWritableRaster(w, h),
cm.isAlphaPremultiplied(),
null);
}
else {
image = new BufferedImage(destCM,
destCM.createCompatibleWritableRaster(w,
h),
destCM.isAlphaPremultiplied(),
null);
}
return image;
| | public java.awt.image.WritableRaster | createCompatibleDestRaster(java.awt.image.Raster src)Creates a zeroed-destination Raster with the
correct size and number of bands, given this source.
return src.createCompatibleWritableRaster();
| | public final java.awt.image.BufferedImage | filter(java.awt.image.BufferedImage src, java.awt.image.BufferedImage dst)Performs a lookup operation on a BufferedImage.
If the color model in the source image is not the same as that
in the destination image, the pixels will be converted
in the destination. If the destination image is null,
a BufferedImage will be created with an appropriate
ColorModel. An IllegalArgumentException
might be thrown if the number of arrays in the
LookupTable does not meet the restrictions
stated in the class comment above, or if the source image
has an IndexColorModel.
ColorModel srcCM = src.getColorModel();
int numBands = srcCM.getNumColorComponents();
ColorModel dstCM;
if (srcCM instanceof IndexColorModel) {
throw new
IllegalArgumentException("LookupOp cannot be "+
"performed on an indexed image");
}
int numComponents = ltable.getNumComponents();
if (numComponents != 1 &&
numComponents != srcCM.getNumComponents() &&
numComponents != srcCM.getNumColorComponents())
{
throw new IllegalArgumentException("Number of arrays in the "+
" lookup table ("+
numComponents+
" is not compatible with the "+
" src image: "+src);
}
boolean needToConvert = false;
int width = src.getWidth();
int height = src.getHeight();
if (dst == null) {
dst = createCompatibleDestImage(src, null);
dstCM = srcCM;
}
else {
if (width != dst.getWidth()) {
throw new
IllegalArgumentException("Src width ("+width+
") not equal to dst width ("+
dst.getWidth()+")");
}
if (height != dst.getHeight()) {
throw new
IllegalArgumentException("Src height ("+height+
") not equal to dst height ("+
dst.getHeight()+")");
}
dstCM = dst.getColorModel();
if (srcCM.getColorSpace().getType() !=
dstCM.getColorSpace().getType())
{
needToConvert = true;
dst = createCompatibleDestImage(src, null);
}
}
BufferedImage origDst = dst;
if (ImagingLib.filter(this, src, dst) == null) {
// Do it the slow way
WritableRaster srcRaster = src.getRaster();
WritableRaster dstRaster = dst.getRaster();
if (srcCM.hasAlpha()) {
if (numBands-1 == numComponents || numComponents == 1) {
int minx = srcRaster.getMinX();
int miny = srcRaster.getMinY();
int[] bands = new int[numBands-1];
for (int i=0; i < numBands-1; i++) {
bands[i] = i;
}
srcRaster =
srcRaster.createWritableChild(minx, miny,
srcRaster.getWidth(),
srcRaster.getHeight(),
minx, miny,
bands);
}
}
if (dstCM.hasAlpha()) {
int dstNumBands = dstRaster.getNumBands();
if (dstNumBands-1 == numComponents || numComponents == 1) {
int minx = dstRaster.getMinX();
int miny = dstRaster.getMinY();
int[] bands = new int[numBands-1];
for (int i=0; i < numBands-1; i++) {
bands[i] = i;
}
dstRaster =
dstRaster.createWritableChild(minx, miny,
dstRaster.getWidth(),
dstRaster.getHeight(),
minx, miny,
bands);
}
}
filter(srcRaster, dstRaster);
}
if (needToConvert) {
// ColorModels are not the same
ColorConvertOp ccop = new ColorConvertOp(hints);
ccop.filter(dst, origDst);
}
return origDst;
| | public final java.awt.image.WritableRaster | filter(java.awt.image.Raster src, java.awt.image.WritableRaster dst)Performs a lookup operation on a Raster.
If the destination Raster is null,
a new Raster will be created.
The IllegalArgumentException might be thrown
if the source Raster and the destination
Raster do not have the same
number of bands or if the number of arrays in the
LookupTable does not meet the
restrictions stated in the class comment above.
int numBands = src.getNumBands();
int dstLength = dst.getNumBands();
int height = src.getHeight();
int width = src.getWidth();
int srcPix[] = new int[numBands];
// Create a new destination Raster, if needed
if (dst == null) {
dst = createCompatibleDestRaster(src);
}
else if (height != dst.getHeight() || width != dst.getWidth()) {
throw new
IllegalArgumentException ("Width or height of Rasters do not "+
"match");
}
dstLength = dst.getNumBands();
if (numBands != dstLength) {
throw new
IllegalArgumentException ("Number of channels in the src ("
+ numBands +
") does not match number of channels"
+ " in the destination ("
+ dstLength + ")");
}
int numComponents = ltable.getNumComponents();
if (numComponents != 1 && numComponents != src.getNumBands()) {
throw new IllegalArgumentException("Number of arrays in the "+
" lookup table ("+
numComponents+
" is not compatible with the "+
" src Raster: "+src);
}
if (ImagingLib.filter(this, src, dst) != null) {
return dst;
}
// Optimize for cases we know about
if (ltable instanceof ByteLookupTable) {
byteFilter ((ByteLookupTable) ltable, src, dst,
width, height, numBands);
}
else if (ltable instanceof ShortLookupTable) {
shortFilter ((ShortLookupTable) ltable, src, dst, width,
height, numBands);
}
else {
// Not one we recognize so do it slowly
int sminX = src.getMinX();
int sY = src.getMinY();
int dminX = dst.getMinX();
int dY = dst.getMinY();
for (int y=0; y < height; y++, sY++, dY++) {
int sX = sminX;
int dX = dminX;
for (int x=0; x < width; x++, sX++, dX++) {
// Find data for all bands at this x,y position
src.getPixel(sX, sY, srcPix);
// Lookup the data for all bands at this x,y position
ltable.lookupPixel(srcPix, srcPix);
// Put it back for all bands
dst.setPixel(dX, dY, srcPix);
}
}
}
return dst;
| | public final java.awt.geom.Rectangle2D | getBounds2D(java.awt.image.BufferedImage src)Returns the bounding box of the filtered destination image. Since
this is not a geometric operation, the bounding box does not
change.
return getBounds2D(src.getRaster());
| | public final java.awt.geom.Rectangle2D | getBounds2D(java.awt.image.Raster src)Returns the bounding box of the filtered destination Raster. Since
this is not a geometric operation, the bounding box does not
change.
return src.getBounds();
| | public final java.awt.geom.Point2D | getPoint2D(java.awt.geom.Point2D srcPt, java.awt.geom.Point2D dstPt)Returns the location of the destination point given a
point in the source. If dstPt is not
null, it will be used to hold the return value.
Since this is not a geometric operation, the srcPt
will equal the dstPt.
if (dstPt == null) {
dstPt = new Point2D.Float();
}
dstPt.setLocation(srcPt.getX(), srcPt.getY());
return dstPt;
| | public final java.awt.RenderingHints | getRenderingHints()Returns the rendering hints for this op.
return hints;
| | public final java.awt.image.LookupTable | getTable()Returns the LookupTable.
return ltable;
| | private final void | shortFilter(java.awt.image.ShortLookupTable lookup, java.awt.image.Raster src, java.awt.image.WritableRaster dst, int width, int height, int numBands)
int band;
int[] srcPix = null;
// Find the ref to the table and the offset
short[][] table = lookup.getTable();
int offset = lookup.getOffset();
int tidx;
int step=1;
// Check if it is one lookup applied to all bands
if (table.length == 1) {
step=0;
}
int x = 0;
int y = 0;
int index;
int maxShort = (1<<16)-1;
// Loop through the data
for (y=0; y < height; y++) {
tidx = 0;
for ( band=0; band < numBands; band++, tidx+=step) {
// Find data for this band, scanline
srcPix = src.getSamples(0, y, width, 1, band, srcPix);
for ( x=0; x < width; x++) {
index = srcPix[x]-offset;
if (index < 0 || index > maxShort) {
throw new
IllegalArgumentException("index out of range "+
index+" x is "+x+
"srcPix[x]="+srcPix[x]
+" offset="+ offset);
}
// Do the lookup
srcPix[x] = table[tidx][index];
}
// Put it back
dst.setSamples(0, y, width, 1, band, srcPix);
}
}
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