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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/awt/image/SinglePixelPackedSampleModel.java | |
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Diffstat (limited to 'libjava/classpath/java/awt/image/SinglePixelPackedSampleModel.java')
-rw-r--r-- | libjava/classpath/java/awt/image/SinglePixelPackedSampleModel.java | 586 |
1 files changed, 586 insertions, 0 deletions
diff --git a/libjava/classpath/java/awt/image/SinglePixelPackedSampleModel.java b/libjava/classpath/java/awt/image/SinglePixelPackedSampleModel.java new file mode 100644 index 000000000..143581db9 --- /dev/null +++ b/libjava/classpath/java/awt/image/SinglePixelPackedSampleModel.java @@ -0,0 +1,586 @@ +/* Copyright (C) 2000, 2002, 2003, 2004, 2006, Free Software Foundation + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package java.awt.image; + +import java.util.Arrays; + +import gnu.java.awt.BitMaskExtent; +import gnu.java.lang.CPStringBuilder; + +/** + * A <code>SampleModel</code> used when all samples are stored in a single + * data element in the {@link DataBuffer}, and each data element contains + * samples for one pixel only. + * + * @author Rolf W. Rasmussen (rolfwr@ii.uib.no) + */ +public class SinglePixelPackedSampleModel extends SampleModel +{ + private int scanlineStride; + private int[] bitMasks; + private int[] bitOffsets; + private int[] sampleSize; + + /** + * Creates a new <code>SinglePixelPackedSampleModel</code>. + * + * @param dataType the data buffer type. + * @param w the width (in pixels). + * @param h the height (in pixels). + * @param bitMasks an array containing the bit mask used to extract the + * sample value for each band. + */ + public SinglePixelPackedSampleModel(int dataType, int w, int h, + int[] bitMasks) + { + this(dataType, w, h, w, bitMasks); + } + + /** + * Creates a new <code>SinglePixelPackedSampleModel</code>. + * + * @param dataType the data buffer type. + * @param w the width (in pixels). + * @param h the height (in pixels). + * @param scanlineStride the number of data elements between a pixel on one + * row and the corresponding pixel on the next row. + * @param bitMasks an array containing the bit mask used to extract the + * sample value for each band. + */ + public SinglePixelPackedSampleModel(int dataType, int w, int h, + int scanlineStride, int[] bitMasks) + { + super(dataType, w, h, bitMasks.length); + + switch (dataType) + { + case DataBuffer.TYPE_BYTE: + case DataBuffer.TYPE_USHORT: + case DataBuffer.TYPE_INT: + break; + default: + throw new IllegalArgumentException( + "SinglePixelPackedSampleModel unsupported dataType"); + } + + this.scanlineStride = scanlineStride; + this.bitMasks = bitMasks; + + bitOffsets = new int[numBands]; + sampleSize = new int[numBands]; + + BitMaskExtent extent = new BitMaskExtent(); + for (int b = 0; b < numBands; b++) + { + // the mask is an unsigned integer + long mask = bitMasks[b] & 0xFFFFFFFFL; + extent.setMask(mask); + sampleSize[b] = extent.bitWidth; + bitOffsets[b] = extent.leastSignificantBit; + } + } + + /** + * Returns the number of data elements. + * + * @return <code>1</code>. + */ + public int getNumDataElements() + { + return 1; + } + + /** + * Creates a new <code>SampleModel</code> that is compatible with this + * model and has the specified width and height. + * + * @param w the width (in pixels). + * @param h the height (in pixels). + * + * @return The new sample model. + */ + public SampleModel createCompatibleSampleModel(int w, int h) + { + /* FIXME: We can avoid recalculation of bit offsets and sample + sizes here by passing these from the current instance to a + special private constructor. */ + return new SinglePixelPackedSampleModel(dataType, w, h, bitMasks); + } + + + /** + * Creates a DataBuffer for holding pixel data in the format and + * layout described by this SampleModel. The returned buffer will + * consist of one single bank. + * + * @return The data buffer. + */ + public DataBuffer createDataBuffer() + { + // We can save (scanlineStride - width) pixels at the very end of + // the buffer. The Sun reference implementation (J2SE 1.3.1 and + // 1.4.1_01) seems to do this; tested with Mauve test code. + int size = scanlineStride * (height - 1) + width; + + DataBuffer buffer = null; + switch (getTransferType()) + { + case DataBuffer.TYPE_BYTE: + buffer = new DataBufferByte(size); + break; + case DataBuffer.TYPE_USHORT: + buffer = new DataBufferUShort(size); + break; + case DataBuffer.TYPE_INT: + buffer = new DataBufferInt(size); + break; + } + return buffer; + } + + /** + * Returns an array containing the size (in bits) for each band accessed by + * the <code>SampleModel</code>. + * + * @return An array. + * + * @see #getSampleSize(int) + */ + public int[] getSampleSize() + { + return (int[]) sampleSize.clone(); + } + + /** + * Returns the size (in bits) of the samples for the specified band. + * + * @param band the band (in the range <code>0</code> to + * <code>getNumBands() - 1</code>). + * + * @return The sample size (in bits). + */ + public int getSampleSize(int band) + { + return sampleSize[band]; + } + + /** + * Returns the index in the data buffer that stores the pixel at (x, y). + * + * @param x the x-coordinate. + * @param y the y-coordinate. + * + * @return The index in the data buffer that stores the pixel at (x, y). + */ + public int getOffset(int x, int y) + { + return scanlineStride*y + x; + } + + public int[] getBitOffsets() + { + return bitOffsets; + } + + public int[] getBitMasks() + { + return bitMasks; + } + + /** + * Returns the number of data elements from a pixel in one row to the + * corresponding pixel in the next row. + * + * @return The scanline stride. + */ + public int getScanlineStride() + { + return scanlineStride; + } + + /** + * Creates a new <code>SinglePixelPackedSampleModel</code> that accesses + * the specified subset of bands. + * + * @param bands an array containing band indices (<code>null</code> not + * permitted). + * + * @return A new sample model. + * + * @throws NullPointerException if <code>bands</code> is <code>null</code>. + * @throws RasterFormatException if <code>bands.length</code> is greater + * than the number of bands in this model. + */ + public SampleModel createSubsetSampleModel(int[] bands) + { + if (bands.length > numBands) + throw new RasterFormatException("Too many bands."); + + int numBands = bands.length; + + int[] bitMasks = new int[numBands]; + + for (int b = 0; b < numBands; b++) + bitMasks[b] = this.bitMasks[bands[b]]; + + return new SinglePixelPackedSampleModel(dataType, width, height, + scanlineStride, bitMasks); + } + + public Object getDataElements(int x, int y, Object obj, + DataBuffer data) + { + int type = getTransferType(); + Object ret = null; + switch (type) + { + case DataBuffer.TYPE_BYTE: + { + byte[] in = (byte[]) obj; + if (in == null) + in = new byte[1]; + in[0] = (byte) data.getElem(x + y * scanlineStride); + ret = in; + } + break; + case DataBuffer.TYPE_USHORT: + { + short[] in = (short[]) obj; + if (in == null) + in = new short[1]; + in[0] = (short) data.getElem(x + y * scanlineStride); + ret = in; + } + break; + case DataBuffer.TYPE_INT: + { + int[] in = (int[]) obj; + if (in == null) + in = new int[1]; + in[0] = data.getElem(x + y * scanlineStride); + ret = in; + } + break; + } + return ret; + } + + /** + * Returns an array containing the samples for the pixel at (x, y) in the + * specified data buffer. If <code>iArray</code> is not <code>null</code>, + * it will be populated with the sample values and returned as the result of + * this function (this avoids allocating a new array instance). + * + * @param x the x-coordinate of the pixel. + * @param y the y-coordinate of the pixel. + * @param iArray an array to populate with the sample values and return as + * the result (if <code>null</code>, a new array will be allocated). + * @param data the data buffer (<code>null</code> not permitted). + * + * @return The pixel sample values. + * + * @throws NullPointerException if <code>data</code> is <code>null</code>. + */ + public int[] getPixel(int x, int y, int[] iArray, DataBuffer data) + { + int offset = scanlineStride*y + x; + if (iArray == null) iArray = new int[numBands]; + int samples = data.getElem(offset); + + for (int b = 0; b < numBands; b++) + iArray[b] = (samples & bitMasks[b]) >>> bitOffsets[b]; + + return iArray; + } + + /** + * Returns an array containing the samples for the pixels in the region + * specified by (x, y, w, h) in the specified data buffer. The array is + * ordered by pixels (that is, all the samples for the first pixel are + * grouped together, followed by all the samples for the second pixel, and so + * on). If <code>iArray</code> is not <code>null</code>, it will be + * populated with the sample values and returned as the result of this + * function (this avoids allocating a new array instance). + * + * @param x the x-coordinate of the top-left pixel. + * @param y the y-coordinate of the top-left pixel. + * @param w the width of the region of pixels. + * @param h the height of the region of pixels. + * @param iArray an array to populate with the sample values and return as + * the result (if <code>null</code>, a new array will be allocated). + * @param data the data buffer (<code>null</code> not permitted). + * + * @return The pixel sample values. + * + * @throws NullPointerException if <code>data</code> is <code>null</code>. + */ + public int[] getPixels(int x, int y, int w, int h, int[] iArray, + DataBuffer data) + { + int offset = scanlineStride*y + x; + if (iArray == null) iArray = new int[numBands*w*h]; + int outOffset = 0; + for (y = 0; y < h; y++) + { + int lineOffset = offset; + for (x = 0; x < w; x++) + { + int samples = data.getElem(lineOffset++); + for (int b = 0; b < numBands; b++) + iArray[outOffset++] = (samples & bitMasks[b]) >>> bitOffsets[b]; + } + offset += scanlineStride; + } + return iArray; + } + + /** + * Returns the sample value for the pixel at (x, y) in the specified data + * buffer. + * + * @param x the x-coordinate of the pixel. + * @param y the y-coordinate of the pixel. + * @param b the band (in the range <code>0</code> to + * <code>getNumBands() - 1</code>). + * @param data the data buffer (<code>null</code> not permitted). + * + * @return The sample value. + * + * @throws NullPointerException if <code>data</code> is <code>null</code>. + */ + public int getSample(int x, int y, int b, DataBuffer data) + { + int offset = scanlineStride*y + x; + int samples = data.getElem(offset); + return (samples & bitMasks[b]) >>> bitOffsets[b]; + } + + public void setDataElements(int x, int y, Object obj, DataBuffer data) + { + int transferType = getTransferType(); + switch (transferType) + { + case DataBuffer.TYPE_BYTE: + { + byte[] in = (byte[]) obj; + data.setElem(y * scanlineStride + x, ((int) in[0]) & 0xff); + } + break; + case DataBuffer.TYPE_USHORT: + { + short[] in = (short[]) obj; + data.setElem(y * scanlineStride + x, ((int) in[0]) & 0xffff); + } + break; + case DataBuffer.TYPE_INT: + { + int[] in = (int[]) obj; + data.setElem(y * scanlineStride + x, in[0]); + break; + } + } + } + + /** + * Sets the samples for the pixel at (x, y) in the specified data buffer to + * the specified values. + * + * @param x the x-coordinate of the pixel. + * @param y the y-coordinate of the pixel. + * @param iArray the sample values (<code>null</code> not permitted). + * @param data the data buffer (<code>null</code> not permitted). + * + * @throws NullPointerException if either <code>iArray</code> or + * <code>data</code> is <code>null</code>. + */ + public void setPixel(int x, int y, int[] iArray, DataBuffer data) + { + int offset = scanlineStride*y + x; + + int samples = 0; + for (int b = 0; b < numBands; b++) + samples |= (iArray[b] << bitOffsets[b]) & bitMasks[b]; + + data.setElem(offset, samples); + } + + /** + * This method implements a more efficient way to set pixels than the default + * implementation of the super class. It copies the pixel components directly + * from the input array instead of creating a intermediate buffer. + * @param x The x-coordinate of the pixel rectangle in <code>obj</code>. + * @param y The y-coordinate of the pixel rectangle in <code>obj</code>. + * @param w The width of the pixel rectangle in <code>obj</code>. + * @param h The height of the pixel rectangle in <code>obj</code>. + * @param iArray The primitive array containing the pixels to set. + * @param data The DataBuffer to store the pixels into. + * @see java.awt.image.SampleModel#setPixels(int, int, int, int, int[], + * java.awt.image.DataBuffer) + */ + public void setPixels(int x, int y, int w, int h, int[] iArray, + DataBuffer data) + { + int inOffset = 0; + for (int yy=y; yy<(y+h); yy++) + { + int offset = scanlineStride*yy + x; + for (int xx=x; xx<(x+w); xx++) + { + int samples = 0; + for (int b = 0; b < numBands; b++) + samples |= (iArray[inOffset+b] << bitOffsets[b]) & bitMasks[b]; + data.setElem(0, offset, samples); + inOffset += numBands; + offset += 1; + } + } + } + + /** + * Sets the sample value for a band for the pixel at (x, y) in the + * specified data buffer. + * + * @param x the x-coordinate of the pixel. + * @param y the y-coordinate of the pixel. + * @param b the band (in the range <code>0</code> to + * <code>getNumBands() - 1</code>). + * @param s the sample value. + * @param data the data buffer (<code>null</code> not permitted). + * + * @throws NullPointerException if <code>data</code> is <code>null</code>. + */ + public void setSample(int x, int y, int b, int s, DataBuffer data) + { + int offset = scanlineStride*y + x; + int samples = data.getElem(offset); + int bitMask = bitMasks[b]; + samples &= ~bitMask; + samples |= (s << bitOffsets[b]) & bitMask; + data.setElem(offset, samples); + } + + /** + * Tests this sample model for equality with an arbitrary object. This + * method returns <code>true</code> if and only if: + * <ul> + * <li><code>obj</code> is not <code>null</code>; + * <li><code>obj</code> is an instance of + * <code>SinglePixelPackedSampleModel</code>; + * <li>both models have the same: + * <ul> + * <li><code>dataType</code>; + * <li><code>width</code>; + * <li><code>height</code>; + * <li><code>numBands</code>; + * <li><code>scanlineStride</code>; + * <li><code>bitMasks</code>; + * <li><code>bitOffsets</code>. + * </ul> + * </li> + * </ul> + * + * @param obj the object (<code>null</code> permitted) + * + * @return <code>true</code> if this model is equal to <code>obj</code>, and + * <code>false</code> otherwise. + */ + public boolean equals(Object obj) + { + if (this == obj) + return true; + if (! (obj instanceof SinglePixelPackedSampleModel)) + return false; + SinglePixelPackedSampleModel that = (SinglePixelPackedSampleModel) obj; + if (this.dataType != that.dataType) + return false; + if (this.width != that.width) + return false; + if (this.height != that.height) + return false; + if (this.numBands != that.numBands) + return false; + if (this.scanlineStride != that.scanlineStride) + return false; + if (!Arrays.equals(this.bitMasks, that.bitMasks)) + return false; + if (!Arrays.equals(this.bitOffsets, that.bitOffsets)) + return false; + return true; + } + + /** + * Returns a hash code for this <code>SinglePixelPackedSampleModel</code>. + * + * @return A hash code. + */ + public int hashCode() + { + // this hash code won't match Sun's, but that shouldn't matter... + int result = 193; + result = 37 * result + dataType; + result = 37 * result + width; + result = 37 * result + height; + result = 37 * result + numBands; + result = 37 * result + scanlineStride; + for (int i = 0; i < bitMasks.length; i++) + result = 37 * result + bitMasks[i]; + for (int i = 0; i < bitOffsets.length; i++) + result = 37 * result + bitOffsets[i]; + return result; + } + + /** + * Creates a String with some information about this SampleModel. + * @return A String describing this SampleModel. + * @see java.lang.Object#toString() + */ + public String toString() + { + CPStringBuilder result = new CPStringBuilder(); + result.append(getClass().getName()); + result.append("["); + result.append("scanlineStride=").append(scanlineStride); + for(int i = 0; i < bitMasks.length; i+=1) + { + result.append(", mask[").append(i).append("]=0x").append( + Integer.toHexString(bitMasks[i])); + } + + result.append("]"); + return result.toString(); + } +} |