| /* |
| * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.awt.image; |
| |
| import java.awt.color.ColorSpace; |
| import java.awt.geom.Rectangle2D; |
| import java.awt.AlphaComposite; |
| import java.awt.Graphics2D; |
| import java.awt.Rectangle; |
| import java.awt.geom.Point2D; |
| import java.awt.RenderingHints; |
| import sun.awt.image.ImagingLib; |
| |
| /** |
| * This class performs a pixel-by-pixel rescaling of the data in the |
| * source image by multiplying the sample values for each pixel by a scale |
| * factor and then adding an offset. The scaled sample values are clipped |
| * to the minimum/maximum representable in the destination image. |
| * <p> |
| * The pseudo code for the rescaling operation is as follows: |
| * <pre> |
| *for each pixel from Source object { |
| * for each band/component of the pixel { |
| * dstElement = (srcElement*scaleFactor) + offset |
| * } |
| *} |
| * </pre> |
| * <p> |
| * For Rasters, rescaling operates on bands. The number of |
| * sets of scaling constants may be one, in which case the same constants |
| * are applied to all bands, or it must equal the number of Source |
| * Raster bands. |
| * <p> |
| * For BufferedImages, rescaling operates on color and alpha components. |
| * The number of sets of scaling constants may be one, in which case the |
| * same constants are applied to all color (but not alpha) components. |
| * Otherwise, the number of sets of scaling constants may |
| * equal the number of Source color components, in which case no |
| * rescaling of the alpha component (if present) is performed. |
| * If neither of these cases apply, the number of sets of scaling constants |
| * must equal the number of Source color components plus alpha components, |
| * in which case all color and alpha components are rescaled. |
| * <p> |
| * BufferedImage sources with premultiplied alpha data are treated in the same |
| * manner as non-premultiplied images for purposes of rescaling. That is, |
| * the rescaling 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. |
| * <p> |
| * Images with an IndexColorModel cannot be rescaled. |
| * <p> |
| * 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. |
| * <p> |
| * Note that in-place operation is allowed (i.e. the source and destination can |
| * be the same object). |
| * @see java.awt.RenderingHints#KEY_COLOR_RENDERING |
| * @see java.awt.RenderingHints#KEY_DITHERING |
| */ |
| public class RescaleOp implements BufferedImageOp, RasterOp { |
| float[] scaleFactors; |
| float[] offsets; |
| int length = 0; |
| RenderingHints hints; |
| |
| private int srcNbits; |
| private int dstNbits; |
| |
| |
| /** |
| * Constructs a new RescaleOp with the desired scale factors |
| * and offsets. The length of the scaleFactor and offset arrays |
| * must meet the restrictions stated in the class comments above. |
| * The RenderingHints argument may be null. |
| * @param scaleFactors the specified scale factors |
| * @param offsets the specified offsets |
| * @param hints the specified {@code RenderingHints}, or |
| * {@code null} |
| */ |
| public RescaleOp (float[] scaleFactors, float[] offsets, |
| RenderingHints hints) { |
| length = scaleFactors.length; |
| if (length > offsets.length) length = offsets.length; |
| |
| this.scaleFactors = new float[length]; |
| this.offsets = new float[length]; |
| for (int i=0; i < length; i++) { |
| this.scaleFactors[i] = scaleFactors[i]; |
| this.offsets[i] = offsets[i]; |
| } |
| this.hints = hints; |
| } |
| |
| /** |
| * Constructs a new RescaleOp with the desired scale factor |
| * and offset. The scaleFactor and offset will be applied to |
| * all bands in a source Raster and to all color (but not alpha) |
| * components in a BufferedImage. |
| * The RenderingHints argument may be null. |
| * @param scaleFactor the specified scale factor |
| * @param offset the specified offset |
| * @param hints the specified {@code RenderingHints}, or |
| * {@code null} |
| */ |
| public RescaleOp (float scaleFactor, float offset, RenderingHints hints) { |
| length = 1; |
| this.scaleFactors = new float[1]; |
| this.offsets = new float[1]; |
| this.scaleFactors[0] = scaleFactor; |
| this.offsets[0] = offset; |
| this.hints = hints; |
| } |
| |
| /** |
| * Returns the scale factors in the given array. The array is also |
| * returned for convenience. If scaleFactors is null, a new array |
| * will be allocated. |
| * @param scaleFactors the array to contain the scale factors of |
| * this {@code RescaleOp} |
| * @return the scale factors of this {@code RescaleOp}. |
| */ |
| public final float[] getScaleFactors (float scaleFactors[]) { |
| if (scaleFactors == null) { |
| return this.scaleFactors.clone(); |
| } |
| System.arraycopy (this.scaleFactors, 0, scaleFactors, 0, |
| Math.min(this.scaleFactors.length, |
| scaleFactors.length)); |
| return scaleFactors; |
| } |
| |
| /** |
| * Returns the offsets in the given array. The array is also returned |
| * for convenience. If offsets is null, a new array |
| * will be allocated. |
| * @param offsets the array to contain the offsets of |
| * this {@code RescaleOp} |
| * @return the offsets of this {@code RescaleOp}. |
| */ |
| public final float[] getOffsets(float offsets[]) { |
| if (offsets == null) { |
| return this.offsets.clone(); |
| } |
| |
| System.arraycopy (this.offsets, 0, offsets, 0, |
| Math.min(this.offsets.length, offsets.length)); |
| return offsets; |
| } |
| |
| /** |
| * Returns the number of scaling factors and offsets used in this |
| * RescaleOp. |
| * @return the number of scaling factors and offsets of this |
| * {@code RescaleOp}. |
| */ |
| public final int getNumFactors() { |
| return length; |
| } |
| |
| |
| /** |
| * Creates a ByteLookupTable to implement the rescale. |
| * The table may have either a SHORT or BYTE input. |
| * @param nElems Number of elements the table is to have. |
| * This will generally be 256 for byte and |
| * 65536 for short. |
| */ |
| private ByteLookupTable createByteLut(float scale[], |
| float off[], |
| int nBands, |
| int nElems) { |
| |
| byte[][] lutData = new byte[nBands][nElems]; |
| int band; |
| |
| for (band=0; band<scale.length; band++) { |
| float bandScale = scale[band]; |
| float bandOff = off[band]; |
| byte[] bandLutData = lutData[band]; |
| for (int i=0; i<nElems; i++) { |
| int val = (int)(i*bandScale + bandOff); |
| if ((val & 0xffffff00) != 0) { |
| if (val < 0) { |
| val = 0; |
| } else { |
| val = 255; |
| } |
| } |
| bandLutData[i] = (byte)val; |
| } |
| |
| } |
| int maxToCopy = (nBands == 4 && scale.length == 4) ? 4 : 3; |
| while (band < lutData.length && band < maxToCopy) { |
| System.arraycopy(lutData[band-1], 0, lutData[band], 0, nElems); |
| band++; |
| } |
| if (nBands == 4 && band < nBands) { |
| byte[] bandLutData = lutData[band]; |
| for (int i=0; i<nElems; i++) { |
| bandLutData[i] = (byte)i; |
| } |
| } |
| |
| return new ByteLookupTable(0, lutData); |
| } |
| |
| /** |
| * Creates a ShortLookupTable to implement the rescale. |
| * The table may have either a SHORT or BYTE input. |
| * @param nElems Number of elements the table is to have. |
| * This will generally be 256 for byte and |
| * 65536 for short. |
| */ |
| private ShortLookupTable createShortLut(float scale[], |
| float off[], |
| int nBands, |
| int nElems) { |
| |
| short[][] lutData = new short[nBands][nElems]; |
| int band = 0; |
| |
| for (band=0; band<scale.length; band++) { |
| float bandScale = scale[band]; |
| float bandOff = off[band]; |
| short[] bandLutData = lutData[band]; |
| for (int i=0; i<nElems; i++) { |
| int val = (int)(i*bandScale + bandOff); |
| if ((val & 0xffff0000) != 0) { |
| if (val < 0) { |
| val = 0; |
| } else { |
| val = 65535; |
| } |
| } |
| bandLutData[i] = (short)val; |
| } |
| } |
| int maxToCopy = (nBands == 4 && scale.length == 4) ? 4 : 3; |
| while (band < lutData.length && band < maxToCopy) { |
| System.arraycopy(lutData[band-1], 0, lutData[band], 0, nElems); |
| band++; |
| } |
| if (nBands == 4 && band < nBands) { |
| short[] bandLutData = lutData[band]; |
| for (int i=0; i<nElems; i++) { |
| bandLutData[i] = (short)i; |
| } |
| } |
| |
| return new ShortLookupTable(0, lutData); |
| } |
| |
| |
| /** |
| * Determines if the rescale can be performed as a lookup. |
| * The dst must be a byte or short type. |
| * The src must be less than 16 bits. |
| * All source band sizes must be the same and all dst band sizes |
| * must be the same. |
| */ |
| private boolean canUseLookup(Raster src, Raster dst) { |
| |
| // |
| // Check that the src datatype is either a BYTE or SHORT |
| // |
| int datatype = src.getDataBuffer().getDataType(); |
| if(datatype != DataBuffer.TYPE_BYTE && |
| datatype != DataBuffer.TYPE_USHORT) { |
| return false; |
| } |
| |
| // |
| // Check dst sample sizes. All must be 8 or 16 bits. |
| // |
| SampleModel dstSM = dst.getSampleModel(); |
| dstNbits = dstSM.getSampleSize(0); |
| |
| if (!(dstNbits == 8 || dstNbits == 16)) { |
| return false; |
| } |
| for (int i=1; i<src.getNumBands(); i++) { |
| int bandSize = dstSM.getSampleSize(i); |
| if (bandSize != dstNbits) { |
| return false; |
| } |
| } |
| |
| // |
| // Check src sample sizes. All must be the same size |
| // |
| SampleModel srcSM = src.getSampleModel(); |
| srcNbits = srcSM.getSampleSize(0); |
| if (srcNbits > 16) { |
| return false; |
| } |
| for (int i=1; i<src.getNumBands(); i++) { |
| int bandSize = srcSM.getSampleSize(i); |
| if (bandSize != srcNbits) { |
| return false; |
| } |
| } |
| |
| if (dstSM instanceof ComponentSampleModel) { |
| ComponentSampleModel dsm = (ComponentSampleModel)dstSM; |
| if (dsm.getPixelStride() != dst.getNumBands()) { |
| return false; |
| } |
| } |
| if (srcSM instanceof ComponentSampleModel) { |
| ComponentSampleModel csm = (ComponentSampleModel)srcSM; |
| if (csm.getPixelStride() != src.getNumBands()) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| /** |
| * Rescales the source 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 the source ColorModel. |
| * An IllegalArgumentException may be thrown if the number of |
| * scaling factors/offsets in this object does not meet the |
| * restrictions stated in the class comments above, or if the |
| * source image has an IndexColorModel. |
| * @param src the {@code BufferedImage} to be filtered |
| * @param dst the destination for the filtering operation |
| * or {@code null} |
| * @return the filtered {@code BufferedImage}. |
| * @throws IllegalArgumentException if the {@code ColorModel} |
| * of {@code src} is an {@code IndexColorModel}, |
| * or if the number of scaling factors and offsets in this |
| * {@code RescaleOp} do not meet the requirements |
| * stated in the class comments, or if the source and |
| * destination images differ in size. |
| */ |
| public final BufferedImage filter (BufferedImage src, BufferedImage dst) { |
| ColorModel srcCM = src.getColorModel(); |
| ColorModel dstCM; |
| int numSrcColorComp = srcCM.getNumColorComponents(); |
| int scaleConst = length; |
| |
| if (srcCM instanceof IndexColorModel) { |
| throw new |
| IllegalArgumentException("Rescaling cannot be "+ |
| "performed on an indexed image"); |
| } |
| if (scaleConst != 1 && scaleConst != numSrcColorComp && |
| scaleConst != srcCM.getNumComponents()) |
| { |
| throw new IllegalArgumentException("Number of scaling constants "+ |
| "does not equal the number of"+ |
| " of color or color/alpha "+ |
| " components"); |
| } |
| |
| boolean needToConvert = false; |
| boolean needToDraw = false; |
| |
| // Include alpha |
| if (scaleConst > numSrcColorComp && srcCM.hasAlpha()) { |
| scaleConst = numSrcColorComp+1; |
| } |
| |
| int width = src.getWidth(); |
| int height = src.getHeight(); |
| |
| BufferedImage origDst = dst; |
| 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); |
| } |
| |
| } |
| |
| // |
| // Try to use a native BI rescale operation first |
| // |
| if (ImagingLib.filter(this, src, dst) == null) { |
| if (src.getRaster().getNumBands() != |
| dst.getRaster().getNumBands()) { |
| needToDraw = true; |
| dst = createCompatibleDestImage(src, null); |
| } |
| |
| // |
| // Native BI rescale failed - convert to rasters |
| // |
| WritableRaster srcRaster = src.getRaster(); |
| WritableRaster dstRaster = dst.getRaster(); |
| |
| // |
| // Call the raster filter method |
| // |
| filterRasterImpl(srcRaster, dstRaster, scaleConst, false); |
| } |
| |
| if (needToDraw) { |
| Graphics2D g = origDst.createGraphics(); |
| g.setComposite(AlphaComposite.Src); |
| g.drawImage(dst, 0, 0, width, height, null); |
| g.dispose(); |
| } |
| if (needToConvert) { |
| // ColorModels are not the same |
| ColorConvertOp ccop = new ColorConvertOp(hints); |
| dst = ccop.filter(dst, origDst); |
| } |
| return dst; |
| } |
| |
| /** |
| * Rescales the pixel data in the source Raster. |
| * If the destination Raster is null, a new Raster will be created. |
| * The source and destination must have the same number of bands. |
| * Otherwise, an IllegalArgumentException is thrown. |
| * Note that the number of scaling factors/offsets in this object must |
| * meet the restrictions stated in the class comments above. |
| * Otherwise, an IllegalArgumentException is thrown. |
| * @param src the {@code Raster} to be filtered |
| * @param dst the destination for the filtering operation |
| * or {@code null} |
| * @return the filtered {@code WritableRaster}. |
| * @throws IllegalArgumentException if {@code src} and |
| * {@code dst} do not have the same number of bands, |
| * or if the number of scaling factors and offsets in this |
| * {@code RescaleOp} do not meet the requirements |
| * stated in the class comments, or if the source and |
| * destination rasters differ in size. |
| */ |
| public final WritableRaster filter (Raster src, WritableRaster dst) { |
| return filterRasterImpl(src, dst, length, true); |
| } |
| |
| private WritableRaster filterRasterImpl(Raster src, WritableRaster dst, |
| int scaleConst, boolean sCheck) { |
| int numBands = src.getNumBands(); |
| int width = src.getWidth(); |
| int height = src.getHeight(); |
| int[] srcPix = null; |
| int step = 0; |
| int tidx = 0; |
| |
| // 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"); |
| } |
| else if (numBands != dst.getNumBands()) { |
| // Make sure that the number of bands are equal |
| throw new IllegalArgumentException("Number of bands in src " |
| + numBands |
| + " does not equal number of bands in dest " |
| + dst.getNumBands()); |
| } |
| |
| // Make sure that the arrays match |
| // Make sure that the low/high/constant arrays match |
| if (sCheck && scaleConst != 1 && scaleConst != src.getNumBands()) { |
| throw new IllegalArgumentException("Number of scaling constants "+ |
| "does not equal the number of"+ |
| " of bands in the src raster"); |
| } |
| |
| // |
| // Try for a native raster rescale first |
| // |
| if (ImagingLib.filter(this, src, dst) != null) { |
| return dst; |
| } |
| |
| // |
| // Native raster rescale failed. |
| // Try to see if a lookup operation can be used |
| // |
| if (canUseLookup(src, dst)) { |
| int srcNgray = (1 << srcNbits); |
| int dstNgray = (1 << dstNbits); |
| |
| if (dstNgray == 256) { |
| ByteLookupTable lut = createByteLut(scaleFactors, offsets, |
| numBands, srcNgray); |
| LookupOp op = new LookupOp(lut, hints); |
| op.filter(src, dst); |
| } else { |
| ShortLookupTable lut = createShortLut(scaleFactors, offsets, |
| numBands, srcNgray); |
| LookupOp op = new LookupOp(lut, hints); |
| op.filter(src, dst); |
| } |
| } else { |
| // |
| // Fall back to the slow code |
| // |
| if (scaleConst > 1) { |
| step = 1; |
| } |
| |
| int sminX = src.getMinX(); |
| int sY = src.getMinY(); |
| int dminX = dst.getMinX(); |
| int dY = dst.getMinY(); |
| int sX; |
| int dX; |
| |
| // |
| // Determine bits per band to determine maxval for clamps. |
| // The min is assumed to be zero. |
| // REMIND: This must change if we ever support signed data types. |
| // |
| int nbits; |
| int dstMax[] = new int[numBands]; |
| int dstMask[] = new int[numBands]; |
| SampleModel dstSM = dst.getSampleModel(); |
| for (int z=0; z<numBands; z++) { |
| nbits = dstSM.getSampleSize(z); |
| dstMax[z] = (1 << nbits) - 1; |
| dstMask[z] = ~(dstMax[z]); |
| } |
| |
| int val; |
| for (int y=0; y < height; y++, sY++, dY++) { |
| dX = dminX; |
| sX = sminX; |
| for (int x = 0; x < width; x++, sX++, dX++) { |
| // Get data for all bands at this x,y position |
| srcPix = src.getPixel(sX, sY, srcPix); |
| tidx = 0; |
| for (int z=0; z<numBands; z++, tidx += step) { |
| if ((scaleConst == 1 || scaleConst == 3) && |
| (z == 3) && (numBands == 4)) { |
| val = srcPix[z]; |
| } else { |
| val = (int)(srcPix[z]*scaleFactors[tidx] |
| + offsets[tidx]); |
| |
| } |
| // Clamp |
| if ((val & dstMask[z]) != 0) { |
| if (val < 0) { |
| val = 0; |
| } else { |
| val = dstMax[z]; |
| } |
| } |
| srcPix[z] = val; |
| |
| } |
| |
| // Put it back for all bands |
| dst.setPixel(dX, dY, srcPix); |
| } |
| } |
| } |
| return dst; |
| } |
| |
| /** |
| * Returns the bounding box of the rescaled destination image. Since |
| * this is not a geometric operation, the bounding box does not |
| * change. |
| */ |
| public final Rectangle2D getBounds2D (BufferedImage src) { |
| return getBounds2D(src.getRaster()); |
| } |
| |
| /** |
| * Returns the bounding box of the rescaled destination Raster. Since |
| * this is not a geometric operation, the bounding box does not |
| * change. |
| * @param src the rescaled destination {@code Raster} |
| * @return the bounds of the specified {@code Raster}. |
| */ |
| public final Rectangle2D getBounds2D (Raster src) { |
| return src.getBounds(); |
| } |
| |
| /** |
| * Creates a zeroed destination image with the correct size and number of |
| * bands. |
| * @param src Source image for the filter operation. |
| * @param destCM ColorModel of the destination. If null, the |
| * ColorModel of the source will be used. |
| * @return the zeroed-destination image. |
| */ |
| public BufferedImage createCompatibleDestImage (BufferedImage src, |
| ColorModel destCM) { |
| BufferedImage image; |
| if (destCM == null) { |
| ColorModel cm = src.getColorModel(); |
| image = new BufferedImage(cm, |
| src.getRaster().createCompatibleWritableRaster(), |
| cm.isAlphaPremultiplied(), |
| null); |
| } |
| else { |
| int w = src.getWidth(); |
| int h = src.getHeight(); |
| image = new BufferedImage (destCM, |
| destCM.createCompatibleWritableRaster(w, h), |
| destCM.isAlphaPremultiplied(), null); |
| } |
| |
| return image; |
| } |
| |
| /** |
| * Creates a zeroed-destination {@code Raster} with the correct |
| * size and number of bands, given this source. |
| * @param src the source {@code Raster} |
| * @return the zeroed-destination {@code Raster}. |
| */ |
| public WritableRaster createCompatibleDestRaster (Raster src) { |
| return src.createCompatibleWritableRaster(src.getWidth(), src.getHeight()); |
| } |
| |
| /** |
| * Returns the location of the destination point given a |
| * point in the source. If dstPt is non-null, it will |
| * be used to hold the return value. Since this is not a geometric |
| * operation, the srcPt will equal the dstPt. |
| * @param srcPt a point in the source image |
| * @param dstPt the destination point or {@code null} |
| * @return the location of the destination point. |
| */ |
| public final Point2D getPoint2D (Point2D srcPt, Point2D dstPt) { |
| if (dstPt == null) { |
| dstPt = new Point2D.Float(); |
| } |
| dstPt.setLocation(srcPt.getX(), srcPt.getY()); |
| return dstPt; |
| } |
| |
| /** |
| * Returns the rendering hints for this op. |
| * @return the rendering hints of this {@code RescaleOp}. |
| */ |
| public final RenderingHints getRenderingHints() { |
| return hints; |
| } |
| } |
