339 lines
9.0 KiB
Java
339 lines
9.0 KiB
Java
/* Copyright (C) 2000 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package java.awt.image;
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import java.awt.Point;
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import java.awt.Transparency;
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import java.awt.color.ColorSpace;
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import gnu.gcj.awt.Buffers;
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/**
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* @author Rolf W. Rasmussen <rolfwr@ii.uib.no>
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*/
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public class DirectColorModel extends PackedColorModel
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{
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public DirectColorModel(int pixelBits, int rmask, int gmask, int bmask)
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{
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this(ColorSpace.getInstance(ColorSpace.CS_sRGB), pixelBits,
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rmask, gmask, bmask, 0,
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false, // not alpha premultiplied
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Buffers.smallestAppropriateTransferType(pixelBits) // find type
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);
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}
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public DirectColorModel(int pixelBits,
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int rmask, int gmask, int bmask, int amask)
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{
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this(ColorSpace.getInstance(ColorSpace.CS_sRGB), pixelBits,
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rmask, gmask, bmask, amask,
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false, // not alpha premultiplied
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Buffers.smallestAppropriateTransferType(pixelBits) // find type
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);
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}
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public DirectColorModel(ColorSpace cspace, int pixelBits,
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int rmask, int gmask, int bmask, int amask,
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boolean isAlphaPremultiplied,
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int transferType)
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{
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super(cspace, pixelBits,
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rmask, gmask, bmask, amask, isAlphaPremultiplied,
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((amask == 0) ? Transparency.OPAQUE : Transparency.TRANSLUCENT),
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transferType);
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}
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public final int getRedMask()
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{
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return getMask(0);
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}
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public final int getGreenMask()
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{
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return getMask(1);
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}
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public final int getBlueMask()
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{
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return getMask(2);
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}
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public final int getAlphaMask()
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{
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return hasAlpha() ? getMask(3) : 0;
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}
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public final int getRed(int pixel)
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{
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return extractAndNormalizeSample(pixel, 0);
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}
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public final int getGreen(int pixel)
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{
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return extractAndNormalizeSample(pixel, 1);
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}
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public final int getBlue(int pixel)
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{
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return extractAndNormalizeSample(pixel, 2);
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}
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public final int getAlpha(int pixel)
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{
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if (!hasAlpha()) return 0;
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return extractAndScaleSample(pixel, 3);
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}
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private final int extractAndNormalizeSample(int pixel, int component)
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{
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int value = extractAndScaleSample(pixel, component);
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if (hasAlpha() && isAlphaPremultiplied())
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value = value*255/getAlpha(pixel);
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return value;
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}
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private final int extractAndScaleSample(int pixel, int component)
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{
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int field = pixel & getMask(component);
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int to8BitShift =
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8 - shifts[component] - getComponentSize(component);
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return (to8BitShift>0) ?
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(field << to8BitShift) :
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(field >>> (-to8BitShift));
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}
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/* FIXME: The Sun docs show that this method is overridden, but I don't
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see any way to improve on the superclass implementation. */
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public final int getRGB(int pixel)
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{
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return super.getRGB(pixel);
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}
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public int getRed(Object inData)
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{
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return getRed(getPixelFromArray(inData));
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}
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public int getGreen(Object inData)
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{
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return getGreen(getPixelFromArray(inData));
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}
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public int getBlue(Object inData)
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{
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return getBlue(getPixelFromArray(inData));
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}
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public int getAlpha(Object inData)
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{
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return getAlpha(getPixelFromArray(inData));
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}
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public int getRGB(Object inData)
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{
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return getRGB(getPixelFromArray(inData));
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}
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/**
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* Converts a normalized pixel int value in the sRGB color
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* space to an array containing a single pixel of the color space
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* of the color model.
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*
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* <p>This method performs the inverse function of
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* <code>getRGB(Object inData)</code>.
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*
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* @param rgb pixel as a normalized sRGB, 0xAARRGGBB value.
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*
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* @param pixel to avoid needless creation of arrays, an array to
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* use to return the pixel can be given. If null, a suitable array
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* will be created.
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*
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* @return array of transferType containing a single pixel. The
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* pixel should be encoded in the natural way of the color model.
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*
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* @see #getRGB(Object)
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*/
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public Object getDataElements(int rgb, Object pixel)
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{
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// FIXME: handle alpha multiply
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int pixelValue = 0;
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int a = 0;
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if (hasAlpha()) {
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a = (rgb >>> 24) & 0xff;
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pixelValue = valueToField(a, 3, 8);
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}
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if (hasAlpha() && isAlphaPremultiplied())
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{
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int r, g, b;
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/* if r=0xff and a=0xff, then resulting
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value will be (r*a)>>>8 == 0xfe... This seems wrong.
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We should divide by 255 rather than shifting >>>8 after
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multiplying.
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Too bad, shifting is probably less expensive.
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r = ((rgb >>> 16) & 0xff)*a;
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g = ((rgb >>> 8) & 0xff)*a;
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b = ((rgb >>> 0) & 0xff)*a; */
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/* The r, g, b values we calculate are 16 bit. This allows
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us to avoid discarding the lower 8 bits obtained if
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multiplying with the alpha band. */
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// using 16 bit values
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r = ((rgb >>> 8) & 0xff00)*a/255;
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g = ((rgb >>> 0) & 0xff00)*a/255;
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b = ((rgb << 8) & 0xff00)*a/255;
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pixelValue |=
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valueToField(r, 0, 16) | // Red
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valueToField(g, 1, 16) | // Green
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valueToField(b, 2, 16); // Blue
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}
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else
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{
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int r, g, b;
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// using 8 bit values
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r = (rgb >>> 16) & 0xff;
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g = (rgb >>> 8) & 0xff;
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b = (rgb >>> 0) & 0xff;
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pixelValue |=
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valueToField(r, 0, 8) | // Red
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valueToField(g, 1, 8) | // Green
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valueToField(b, 2, 8); // Blue
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}
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/* In this color model, the whole pixel fits in the first element
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of the array. */
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DataBuffer buffer = Buffers.createBuffer(transferType, pixel, 1);
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buffer.setElem(0, pixelValue);
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return Buffers.getData(buffer);
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}
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/**
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* Converts a value to the correct field bits based on the
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* information derived from the field masks.
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*
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* @param highBit the position of the most significant bit in the
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* val parameter.
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*/
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private final int valueToField(int val, int component, int highBit)
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{
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int toFieldShift =
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getComponentSize(component) + shifts[component] - highBit;
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int ret = (toFieldShift>0) ?
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(val << toFieldShift) :
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(val >>> (-toFieldShift));
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return ret & getMask(component);
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}
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/**
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* Converts a 16 bit value to the correct field bits based on the
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* information derived from the field masks.
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*/
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private final int value16ToField(int val, int component)
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{
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int toFieldShift = getComponentSize(component) + shifts[component] - 16;
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return (toFieldShift>0) ?
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(val << toFieldShift) :
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(val >>> (-toFieldShift));
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}
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/**
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* Fills an array with the unnormalized component samples from a
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* pixel value. I.e. decompose the pixel, but not perform any
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* color conversion.
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*/
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public final int[] getComponents(int pixel, int[] components, int offset)
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{
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int numComponents = getNumComponents();
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if (components == null) components = new int[offset + numComponents];
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for (int b=0; b<numComponents; b++)
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components[offset++] = (pixel&getMask(b)) >>> shifts[b];
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return components;
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}
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public final int[] getComponents(Object pixel, int[] components,
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int offset)
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{
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return getComponents(getPixelFromArray(pixel), components, offset);
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}
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public final WritableRaster createCompatibleWritableRaster(int w, int h)
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{
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SampleModel sm = createCompatibleSampleModel(w, h);
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Point origin = new Point(0, 0);
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return Raster.createWritableRaster(sm, origin);
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}
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public int getDataElement(int[] components, int offset)
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{
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int numComponents = getNumComponents();
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int pixelValue = 0;
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for (int c=0; c<numComponents; c++)
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pixelValue |= (components[offset++] << shifts[c]) & getMask(c);
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return pixelValue;
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}
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public Object getDataElements(int[] components, int offset, Object obj)
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{
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/* In this color model, the whole pixel fits in the first element
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of the array. */
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int pixelValue = getDataElement(components, offset);
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DataBuffer buffer = Buffers.createBuffer(transferType, obj, 1);
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buffer.setElem(0, pixelValue);
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return Buffers.getData(buffer);
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}
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public ColorModel coerceData(WritableRaster raster,
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boolean isAlphaPremultiplied)
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{
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if (this.isAlphaPremultiplied == isAlphaPremultiplied)
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return this;
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/* TODO: provide better implementation based on the
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assumptions we can make due to the specific type of the
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color model. */
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super.coerceData(raster, isAlphaPremultiplied);
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return new ComponentColorModel(cspace, bits, hasAlpha(),
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isAlphaPremultiplied, // argument
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transparency, transferType);
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}
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public boolean isCompatibleRaster(Raster raster)
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{
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/* FIXME: the Sun docs say this method is overridden here,
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but I don't see any way to improve upon the implementation
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in ColorModel. */
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return super.isCompatibleRaster(raster);
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}
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String stringParam()
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{
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return super.stringParam() +
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", redMask=" + Integer.toHexString(getRedMask()) +
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", greenMask=" + Integer.toHexString(getGreenMask()) +
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", blueMask=" + Integer.toHexString(getBlueMask()) +
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", alphaMask=" + Integer.toHexString(getAlphaMask());
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}
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public String toString()
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{
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/* FIXME: Again, docs say override, but how do we improve upon the
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superclass implementation? */
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return super.toString();
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}
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}
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