Google Git
Sign in
android / platform / libcore.git / 51b1b6997fd3f980076b8081f7f1165ccc2a4008 / . / ojluni / src / main / java / java / awt / image / ComponentColorModel.java
blob: ec0bce587f0c7885e9c8c969a59df96c0029bb9d [file] [log] [blame]
/*
* Copyright (c) 1997, 2003, 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.color.ICC_ColorSpace;
/**
* A <CODE>ColorModel</CODE> class that works with pixel values that
* represent color and alpha information as separate samples and that
* store each sample in a separate data element. This class can be
* used with an arbitrary <CODE>ColorSpace</CODE>. The number of
* color samples in the pixel values must be same as the number of
* color components in the <CODE>ColorSpace</CODE>. There may be a
* single alpha sample.
* <p>
* For those methods that use
* a primitive array pixel representation of type <CODE>transferType</CODE>,
* the array length is the same as the number of color and alpha samples.
* Color samples are stored first in the array followed by the alpha
* sample, if present. The order of the color samples is specified
* by the <CODE>ColorSpace</CODE>. Typically, this order reflects the
* name of the color space type. For example, for <CODE>TYPE_RGB</CODE>,
* index 0 corresponds to red, index 1 to green, and index 2 to blue.
* <p>
* The translation from pixel sample values to color/alpha components for
* display or processing purposes is based on a one-to-one correspondence of
* samples to components.
* Depending on the transfer type used to create an instance of
* <code>ComponentColorModel</code>, the pixel sample values
* represented by that instance may be signed or unsigned and may
* be of integral type or float or double (see below for details).
* The translation from sample values to normalized color/alpha components
* must follow certain rules. For float and double samples, the translation
* is an identity, i.e. normalized component values are equal to the
* corresponding sample values. For integral samples, the translation
* should be only a simple scale and offset, where the scale and offset
* constants may be different for each component. The result of
* applying the scale and offset constants is a set of color/alpha
* component values, which are guaranteed to fall within a certain
* range. Typically, the range for a color component will be the range
* defined by the <code>getMinValue</code> and <code>getMaxValue</code>
* methods of the <code>ColorSpace</code> class. The range for an
* alpha component should be 0.0 to 1.0.
* <p>
* Instances of <code>ComponentColorModel</code> created with transfer types
* <CODE>DataBuffer.TYPE_BYTE</CODE>, <CODE>DataBuffer.TYPE_USHORT</CODE>,
* and <CODE>DataBuffer.TYPE_INT</CODE> have pixel sample values which
* are treated as unsigned integral values.
* The number of bits in a color or alpha sample of a pixel value might not
* be the same as the number of bits for the corresponding color or alpha
* sample passed to the
* <code>ComponentColorModel(ColorSpace, int[], boolean, boolean, int, int)</code>
* constructor. In
* that case, this class assumes that the least significant n bits of a sample
* value hold the component value, where n is the number of significant bits
* for the component passed to the constructor. It also assumes that
* any higher-order bits in a sample value are zero. Thus, sample values
* range from 0 to 2<sup>n</sup> - 1. This class maps these sample values
* to normalized color component values such that 0 maps to the value
* obtained from the <code>ColorSpace's</code> <code>getMinValue</code>
* method for each component and 2<sup>n</sup> - 1 maps to the value
* obtained from <code>getMaxValue</code>. To create a
* <code>ComponentColorModel</code> with a different color sample mapping
* requires subclassing this class and overriding the
* <code>getNormalizedComponents(Object, float[], int)</code> method.
* The mapping for an alpha sample always maps 0 to 0.0 and
* 2<sup>n</sup> - 1 to 1.0.
* <p>
* For instances with unsigned sample values,
* the unnormalized color/alpha component representation is only
* supported if two conditions hold. First, sample value value 0 must
* map to normalized component value 0.0 and sample value 2<sup>n</sup> - 1
* to 1.0. Second the min/max range of all color components of the
* <code>ColorSpace</code> must be 0.0 to 1.0. In this case, the
* component representation is the n least
* significant bits of the corresponding sample. Thus each component is
* an unsigned integral value between 0 and 2<sup>n</sup> - 1, where
* n is the number of significant bits for a particular component.
* If these conditions are not met, any method taking an unnormalized
* component argument will throw an <code>IllegalArgumentException</code>.
* <p>
* Instances of <code>ComponentColorModel</code> created with transfer types
* <CODE>DataBuffer.TYPE_SHORT</CODE>, <CODE>DataBuffer.TYPE_FLOAT</CODE>, and
* <CODE>DataBuffer.TYPE_DOUBLE</CODE> have pixel sample values which
* are treated as signed short, float, or double values.
* Such instances do not support the unnormalized color/alpha component
* representation, so any methods taking such a representation as an argument
* will throw an <code>IllegalArgumentException</code> when called on one
* of these instances. The normalized component values of instances
* of this class have a range which depends on the transfer
* type as follows: for float samples, the full range of the float data
* type; for double samples, the full range of the float data type
* (resulting from casting double to float); for short samples,
* from approximately -maxVal to +maxVal, where maxVal is the per
* component maximum value for the <code>ColorSpace</code>
* (-32767 maps to -maxVal, 0 maps to 0.0, and 32767 maps
* to +maxVal). A subclass may override the scaling for short sample
* values to normalized component values by overriding the
* <code>getNormalizedComponents(Object, float[], int)</code> method.
* For float and double samples, the normalized component values are
* taken to be equal to the corresponding sample values, and subclasses
* should not attempt to add any non-identity scaling for these transfer
* types.
* <p>
* Instances of <code>ComponentColorModel</code> created with transfer types
* <CODE>DataBuffer.TYPE_SHORT</CODE>, <CODE>DataBuffer.TYPE_FLOAT</CODE>, and
* <CODE>DataBuffer.TYPE_DOUBLE</CODE>
* use all the bits of all sample values. Thus all color/alpha components
* have 16 bits when using <CODE>DataBuffer.TYPE_SHORT</CODE>, 32 bits when
* using <CODE>DataBuffer.TYPE_FLOAT</CODE>, and 64 bits when using
* <CODE>DataBuffer.TYPE_DOUBLE</CODE>. When the
* <code>ComponentColorModel(ColorSpace, int[], boolean, boolean, int, int)</code>
* form of constructor is used with one of these transfer types, the
* bits array argument is ignored.
* <p>
* It is possible to have color/alpha sample values
* which cannot be reasonably interpreted as component values for rendering.
* This can happen when <code>ComponentColorModel</code> is subclassed to
* override the mapping of unsigned sample values to normalized color
* component values or when signed sample values outside a certain range
* are used. (As an example, specifying an alpha component as a signed
* short value outside the range 0 to 32767, normalized range 0.0 to 1.0, can
* lead to unexpected results.) It is the
* responsibility of applications to appropriately scale pixel data before
* rendering such that color components fall within the normalized range
* of the <code>ColorSpace</code> (obtained using the <code>getMinValue</code>
* and <code>getMaxValue</code> methods of the <code>ColorSpace</code> class)
* and the alpha component is between 0.0 and 1.0. If color or alpha
* component values fall outside these ranges, rendering results are
* indeterminate.
* <p>
* Methods that use a single int pixel representation throw
* an <CODE>IllegalArgumentException</CODE>, unless the number of components
* for the <CODE>ComponentColorModel</CODE> is one and the component
* value is unsigned -- in other words, a single color component using
* a transfer type of <CODE>DataBuffer.TYPE_BYTE</CODE>,
* <CODE>DataBuffer.TYPE_USHORT</CODE>, or <CODE>DataBuffer.TYPE_INT</CODE>
* and no alpha.
* <p>
* A <CODE>ComponentColorModel</CODE> can be used in conjunction with a
* <CODE>ComponentSampleModel</CODE>, a <CODE>BandedSampleModel</CODE>,
* or a <CODE>PixelInterleavedSampleModel</CODE> to construct a
* <CODE>BufferedImage</CODE>.
*
* @see ColorModel
* @see ColorSpace
* @see ComponentSampleModel
* @see BandedSampleModel
* @see PixelInterleavedSampleModel
* @see BufferedImage
*
*/
public class ComponentColorModel extends ColorModel {
/**
* <code>signed</code> is <code>true</code> for <code>short</code>,
* <code>float</code>, and <code>double</code> transfer types; it
* is <code>false</code> for <code>byte</code>, <code>ushort</code>,
* and <code>int</code> transfer types.
*/
private boolean signed; // true for transfer types short, float, double
// false for byte, ushort, int
private boolean is_sRGB_stdScale;
private boolean is_LinearRGB_stdScale;
private boolean is_LinearGray_stdScale;
private boolean is_ICCGray_stdScale;
private byte[] tosRGB8LUT;
private byte[] fromsRGB8LUT8;
private short[] fromsRGB8LUT16;
private byte[] fromLinearGray16ToOtherGray8LUT;
private short[] fromLinearGray16ToOtherGray16LUT;
private boolean needScaleInit;
private boolean noUnnorm;
private boolean nonStdScale;
private float[] min;
private float[] diffMinMax;
private float[] compOffset;
private float[] compScale;
/**
* Constructs a <CODE>ComponentColorModel</CODE> from the specified
* parameters. Color components will be in the specified
* <CODE>ColorSpace</CODE>. The supported transfer types are
* <CODE>DataBuffer.TYPE_BYTE</CODE>, <CODE>DataBuffer.TYPE_USHORT</CODE>,
* <CODE>DataBuffer.TYPE_INT</CODE>,
* <CODE>DataBuffer.TYPE_SHORT</CODE>, <CODE>DataBuffer.TYPE_FLOAT</CODE>,
* and <CODE>DataBuffer.TYPE_DOUBLE</CODE>.
* If not null, the <CODE>bits</CODE> array specifies the
* number of significant bits per color and alpha component and its
* length should be at least the number of components in the
* <CODE>ColorSpace</CODE> if there is no alpha
* information in the pixel values, or one more than this number if
* there is alpha information. When the <CODE>transferType</CODE> is
* <CODE>DataBuffer.TYPE_SHORT</CODE>, <CODE>DataBuffer.TYPE_FLOAT</CODE>,
* or <CODE>DataBuffer.TYPE_DOUBLE</CODE> the <CODE>bits</CODE> array
* argument is ignored. <CODE>hasAlpha</CODE> indicates whether alpha
* information is present. If <CODE>hasAlpha</CODE> is true, then
* the boolean <CODE>isAlphaPremultiplied</CODE>
* specifies how to interpret color and alpha samples in pixel values.
* If the boolean is true, color samples are assumed to have been
* multiplied by the alpha sample. The <CODE>transparency</CODE>
* specifies what alpha values can be represented by this color model.
* The acceptable <code>transparency</code> values are
* <CODE>OPAQUE</CODE>, <CODE>BITMASK</CODE> or <CODE>TRANSLUCENT</CODE>.
* The <CODE>transferType</CODE> is the type of primitive array used
* to represent pixel values.
*
* @param colorSpace The <CODE>ColorSpace</CODE> associated
* with this color model.
* @param bits The number of significant bits per component.
* May be null, in which case all bits of all
* component samples will be significant.
* Ignored if transferType is one of
* <CODE>DataBuffer.TYPE_SHORT</CODE>,
* <CODE>DataBuffer.TYPE_FLOAT</CODE>, or
* <CODE>DataBuffer.TYPE_DOUBLE</CODE>,
* in which case all bits of all component
* samples will be significant.
* @param hasAlpha If true, this color model supports alpha.
* @param isAlphaPremultiplied If true, alpha is premultiplied.
* @param transparency Specifies what alpha values can be represented
* by this color model.
* @param transferType Specifies the type of primitive array used to
* represent pixel values.
*
* @throws IllegalArgumentException If the <CODE>bits</CODE> array
* argument is not null, its length is less than the number of
* color and alpha components, and transferType is one of
* <CODE>DataBuffer.TYPE_BYTE</CODE>,
* <CODE>DataBuffer.TYPE_USHORT</CODE>, or
* <CODE>DataBuffer.TYPE_INT</CODE>.
* @throws IllegalArgumentException If transferType is not one of
* <CODE>DataBuffer.TYPE_BYTE</CODE>,
* <CODE>DataBuffer.TYPE_USHORT</CODE>,
* <CODE>DataBuffer.TYPE_INT</CODE>,
* <CODE>DataBuffer.TYPE_SHORT</CODE>,
* <CODE>DataBuffer.TYPE_FLOAT</CODE>, or
* <CODE>DataBuffer.TYPE_DOUBLE</CODE>.
*
* @see ColorSpace
* @see java.awt.Transparency
*/
public ComponentColorModel (ColorSpace colorSpace,
int[] bits,
boolean hasAlpha,
boolean isAlphaPremultiplied,
int transparency,
int transferType) {
super (bitsHelper(transferType, colorSpace, hasAlpha),
bitsArrayHelper(bits, transferType, colorSpace, hasAlpha),
colorSpace, hasAlpha, isAlphaPremultiplied, transparency,
transferType);
switch(transferType) {
case DataBuffer.TYPE_BYTE:
case DataBuffer.TYPE_USHORT:
case DataBuffer.TYPE_INT:
signed = false;
needScaleInit = true;
break;
case DataBuffer.TYPE_SHORT:
signed = true;
needScaleInit = true;
break;
case DataBuffer.TYPE_FLOAT:
case DataBuffer.TYPE_DOUBLE:
signed = true;
needScaleInit = false;
noUnnorm = true;
nonStdScale = false;
break;
default:
throw new IllegalArgumentException("This constructor is not "+
"compatible with transferType " + transferType);
}
setupLUTs();
}
/**
* Constructs a <CODE>ComponentColorModel</CODE> from the specified
* parameters. Color components will be in the specified
* <CODE>ColorSpace</CODE>. The supported transfer types are
* <CODE>DataBuffer.TYPE_BYTE</CODE>, <CODE>DataBuffer.TYPE_USHORT</CODE>,
* <CODE>DataBuffer.TYPE_INT</CODE>,
* <CODE>DataBuffer.TYPE_SHORT</CODE>, <CODE>DataBuffer.TYPE_FLOAT</CODE>,
* and <CODE>DataBuffer.TYPE_DOUBLE</CODE>. The number of significant
* bits per color and alpha component will be 8, 16, 32, 16, 32, or 64,
* respectively. The number of color components will be the
* number of components in the <CODE>ColorSpace</CODE>. There will be
* an alpha component if <CODE>hasAlpha</CODE> is <CODE>true</CODE>.
* If <CODE>hasAlpha</CODE> is true, then
* the boolean <CODE>isAlphaPremultiplied</CODE>
* specifies how to interpret color and alpha samples in pixel values.
* If the boolean is true, color samples are assumed to have been
* multiplied by the alpha sample. The <CODE>transparency</CODE>
* specifies what alpha values can be represented by this color model.
* The acceptable <code>transparency</code> values are
* <CODE>OPAQUE</CODE>, <CODE>BITMASK</CODE> or <CODE>TRANSLUCENT</CODE>.
* The <CODE>transferType</CODE> is the type of primitive array used
* to represent pixel values.
*
* @param colorSpace The <CODE>ColorSpace</CODE> associated
* with this color model.
* @param hasAlpha If true, this color model supports alpha.
* @param isAlphaPremultiplied If true, alpha is premultiplied.
* @param transparency Specifies what alpha values can be represented
* by this color model.
* @param transferType Specifies the type of primitive array used to
* represent pixel values.
*
* @throws IllegalArgumentException If transferType is not one of
* <CODE>DataBuffer.TYPE_BYTE</CODE>,
* <CODE>DataBuffer.TYPE_USHORT</CODE>,
* <CODE>DataBuffer.TYPE_INT</CODE>,
* <CODE>DataBuffer.TYPE_SHORT</CODE>,
* <CODE>DataBuffer.TYPE_FLOAT</CODE>, or
* <CODE>DataBuffer.TYPE_DOUBLE</CODE>.
*
* @see ColorSpace
* @see java.awt.Transparency
* @since 1.4
*/
public ComponentColorModel (ColorSpace colorSpace,
boolean hasAlpha,
boolean isAlphaPremultiplied,
int transparency,
int transferType) {
this(colorSpace, null, hasAlpha, isAlphaPremultiplied,
transparency, transferType);
}
private static int bitsHelper(int transferType,
ColorSpace colorSpace,
boolean hasAlpha) {
int numBits = DataBuffer.getDataTypeSize(transferType);
int numComponents = colorSpace.getNumComponents();
if (hasAlpha) {
++numComponents;
}
return numBits * numComponents;
}
private static int[] bitsArrayHelper(int[] origBits,
int transferType,
ColorSpace colorSpace,
boolean hasAlpha) {
switch(transferType) {
case DataBuffer.TYPE_BYTE:
case DataBuffer.TYPE_USHORT:
case DataBuffer.TYPE_INT:
if (origBits != null) {
return origBits;
}
break;
default:
break;
}
int numBits = DataBuffer.getDataTypeSize(transferType);
int numComponents = colorSpace.getNumComponents();
if (hasAlpha) {
++numComponents;
}
int[] bits = new int[numComponents];
for (int i = 0; i < numComponents; i++) {
bits[i] = numBits;
}
return bits;
}
private void setupLUTs() {
// REMIND: there is potential to accelerate sRGB, LinearRGB,
// LinearGray, ICCGray, and non-ICC Gray spaces with non-standard
// scaling, if that becomes important
//
// NOTE: The is_xxx_stdScale and nonStdScale booleans are provisionally
// set here when this method is called at construction time. These
// variables may be set again when initScale is called later.
// When setupLUTs returns, nonStdScale is true if (the transferType
// is not float or double) AND (some minimum ColorSpace component
// value is not 0.0 OR some maximum ColorSpace component value
// is not 1.0). This is correct for the calls to
// getNormalizedComponents(Object, float[], int) from initScale().
// initScale() may change the value nonStdScale based on the
// return value of getNormalizedComponents() - this will only
// happen if getNormalizedComponents() has been overridden by a
// subclass to make the mapping of min/max pixel sample values
// something different from min/max color component values.
if (is_sRGB) {
is_sRGB_stdScale = true;
nonStdScale = false;
} else if (ColorModel.isLinearRGBspace(colorSpace)) {
// Note that the built-in Linear RGB space has a normalized
// range of 0.0 - 1.0 for each coordinate. Usage of these
// LUTs makes that assumption.
is_LinearRGB_stdScale = true;
nonStdScale = false;
if (transferType == DataBuffer.TYPE_BYTE) {
tosRGB8LUT = ColorModel.getLinearRGB8TosRGB8LUT();
fromsRGB8LUT8 = ColorModel.getsRGB8ToLinearRGB8LUT();
} else {
tosRGB8LUT = ColorModel.getLinearRGB16TosRGB8LUT();
fromsRGB8LUT16 = ColorModel.getsRGB8ToLinearRGB16LUT();
}
} else if ((colorSpaceType == ColorSpace.TYPE_GRAY) &&
(colorSpace instanceof ICC_ColorSpace) &&
(colorSpace.getMinValue(0) == 0.0f) &&
(colorSpace.getMaxValue(0) == 1.0f)) {
// Note that a normalized range of 0.0 - 1.0 for the gray
// component is required, because usage of these LUTs makes
// that assumption.
ICC_ColorSpace ics = (ICC_ColorSpace) colorSpace;
is_ICCGray_stdScale = true;
nonStdScale = false;
fromsRGB8LUT16 = ColorModel.getsRGB8ToLinearRGB16LUT();
if (ColorModel.isLinearGRAYspace(ics)) {
is_LinearGray_stdScale = true;
if (transferType == DataBuffer.TYPE_BYTE) {
tosRGB8LUT = ColorModel.getGray8TosRGB8LUT(ics);
} else {
tosRGB8LUT = ColorModel.getGray16TosRGB8LUT(ics);
}
} else {
if (transferType == DataBuffer.TYPE_BYTE) {
tosRGB8LUT = ColorModel.getGray8TosRGB8LUT(ics);
fromLinearGray16ToOtherGray8LUT =
ColorModel.getLinearGray16ToOtherGray8LUT(ics);
} else {
tosRGB8LUT = ColorModel.getGray16TosRGB8LUT(ics);
fromLinearGray16ToOtherGray16LUT =
ColorModel.getLinearGray16ToOtherGray16LUT(ics);
}
}
} else if (needScaleInit) {
// if transferType is byte, ushort, int, or short and we
// don't already know the ColorSpace has minVlaue == 0.0f and
// maxValue == 1.0f for all components, we need to check that
// now and setup the min[] and diffMinMax[] arrays if necessary.
nonStdScale = false;
for (int i = 0; i < numColorComponents; i++) {
if ((colorSpace.getMinValue(i) != 0.0f) ||
(colorSpace.getMaxValue(i) != 1.0f)) {
nonStdScale = true;
break;
}
}
if (nonStdScale) {
min = new float[numColorComponents];
diffMinMax = new float[numColorComponents];
for (int i = 0; i < numColorComponents; i++) {
min[i] = colorSpace.getMinValue(i);
diffMinMax[i] = colorSpace.getMaxValue(i) - min[i];
}
}
}
}
private void initScale() {
// This method is called the first time any method which uses
// pixel sample value to color component value scaling information
// is called if the transferType supports non-standard scaling
// as defined above (byte, ushort, int, and short), unless the
// method is getNormalizedComponents(Object, float[], int) (that
// method must be overridden to use non-standard scaling). This
// method also sets up the noUnnorm boolean variable for these
// transferTypes. After this method is called, the nonStdScale
// variable will be true if getNormalizedComponents() maps a
// sample value of 0 to anything other than 0.0f OR maps a
// sample value of 2^^n - 1 (2^^15 - 1 for short transferType)
// to anything other than 1.0f. Note that this can be independent
// of the colorSpace min/max component values, if the
// getNormalizedComponents() method has been overridden for some
// reason, e.g. to provide greater dynamic range in the sample
// values than in the color component values. Unfortunately,
// this method can't be called at construction time, since a
// subclass may still have uninitialized state that would cause
// getNormalizedComponents() to return an incorrect result.
needScaleInit = false; // only needs to called once
if (nonStdScale || signed) {
// The unnormalized form is only supported for unsigned
// transferTypes and when the ColorSpace min/max values
// are 0.0/1.0. When this method is called nonStdScale is
// true if the latter condition does not hold. In addition,
// the unnormalized form requires that the full range of
// the pixel sample values map to the full 0.0 - 1.0 range
// of color component values. That condition is checked
// later in this method.
noUnnorm = true;
} else {
noUnnorm = false;
}
float[] lowVal, highVal;
switch (transferType) {
case DataBuffer.TYPE_BYTE:
{
byte[] bpixel = new byte[numComponents];
for (int i = 0; i < numColorComponents; i++) {
bpixel[i] = 0;
}
if (supportsAlpha) {
bpixel[numColorComponents] =
(byte) ((1 << nBits[numColorComponents]) - 1);
}
lowVal = getNormalizedComponents(bpixel, null, 0);
for (int i = 0; i < numColorComponents; i++) {
bpixel[i] = (byte) ((1 << nBits[i]) - 1);
}
highVal = getNormalizedComponents(bpixel, null, 0);
}
break;
case DataBuffer.TYPE_USHORT:
{
short[] uspixel = new short[numComponents];
for (int i = 0; i < numColorComponents; i++) {
uspixel[i] = 0;
}
if (supportsAlpha) {
uspixel[numColorComponents] =
(short) ((1 << nBits[numColorComponents]) - 1);
}
lowVal = getNormalizedComponents(uspixel, null, 0);
for (int i = 0; i < numColorComponents; i++) {
uspixel[i] = (short) ((1 << nBits[i]) - 1);
}
highVal = getNormalizedComponents(uspixel, null, 0);
}
break;
case DataBuffer.TYPE_INT:
{
int[] ipixel = new int[numComponents];
for (int i = 0; i < numColorComponents; i++) {
ipixel[i] = 0;
}
if (supportsAlpha) {
ipixel[numColorComponents] =
((1 << nBits[numColorComponents]) - 1);
}
lowVal = getNormalizedComponents(ipixel, null, 0);
for (int i = 0; i < numColorComponents; i++) {
ipixel[i] = ((1 << nBits[i]) - 1);
}
highVal = getNormalizedComponents(ipixel, null, 0);
}
break;
case DataBuffer.TYPE_SHORT:
{
short[] spixel = new short[numComponents];
for (int i = 0; i < numColorComponents; i++) {
spixel[i] = 0;
}
if (supportsAlpha) {
spixel[numColorComponents] = 32767;
}
lowVal = getNormalizedComponents(spixel, null, 0);
for (int i = 0; i < numColorComponents; i++) {
spixel[i] = 32767;
}
highVal = getNormalizedComponents(spixel, null, 0);
}
break;
default:
lowVal = highVal = null; // to keep the compiler from complaining
break;
}
nonStdScale = false;
for (int i = 0; i < numColorComponents; i++) {
if ((lowVal[i] != 0.0f) || (highVal[i] != 1.0f)) {
nonStdScale = true;
break;
}
}
if (nonStdScale) {
noUnnorm = true;
is_sRGB_stdScale = false;
is_LinearRGB_stdScale = false;
is_LinearGray_stdScale = false;
is_ICCGray_stdScale = false;
compOffset = new float[numColorComponents];
compScale = new float[numColorComponents];
for (int i = 0; i < numColorComponents; i++) {
compOffset[i] = lowVal[i];
compScale[i] = 1.0f / (highVal[i] - lowVal[i]);
}
}
}
private int getRGBComponent(int pixel, int idx) {
if (numComponents > 1) {
throw new
IllegalArgumentException("More than one component per pixel");
}
if (signed) {
throw new
IllegalArgumentException("Component value is signed");
}
if (needScaleInit) {
initScale();
}
// Since there is only 1 component, there is no alpha
// Normalize the pixel in order to convert it
Object opixel = null;
switch (transferType) {
case DataBuffer.TYPE_BYTE:
{
byte[] bpixel = { (byte) pixel };
opixel = bpixel;
}
break;
case DataBuffer.TYPE_USHORT:
{
short[] spixel = { (short) pixel };
opixel = spixel;
}
break;
case DataBuffer.TYPE_INT:
{
int[] ipixel = { pixel };
opixel = ipixel;
}
break;
}
float[] norm = getNormalizedComponents(opixel, null, 0);
float[] rgb = colorSpace.toRGB(norm);
return (int) (rgb[idx] * 255.0f + 0.5f);
}
/**
* Returns the red color component for the specified pixel, scaled
* from 0 to 255 in the default RGB ColorSpace, sRGB. A color conversion
* is done if necessary. The pixel value is specified as an int.
* The returned value will be a non pre-multiplied value.
* If the alpha is premultiplied, this method divides
* it out before returning the value (if the alpha value is 0,
* the red value will be 0).
*
* @param pixel The pixel from which you want to get the red color component.
*
* @return The red color component for the specified pixel, as an int.
*
* @throws IllegalArgumentException If there is more than
* one component in this <CODE>ColorModel</CODE>.
* @throws IllegalArgumentException If the component value for this
* <CODE>ColorModel</CODE> is signed
*/
public int getRed(int pixel) {
return getRGBComponent(pixel, 0);
}
/**
* Returns the green color component for the specified pixel, scaled
* from 0 to 255 in the default RGB ColorSpace, sRGB. A color conversion
* is done if necessary. The pixel value is specified as an int.
* The returned value will be a non
* pre-multiplied value. If the alpha is premultiplied, this method
* divides it out before returning the value (if the alpha value is 0,
* the green value will be 0).
*
* @param pixel The pixel from which you want to get the green color component.
*
* @return The green color component for the specified pixel, as an int.
*
* @throws IllegalArgumentException If there is more than
* one component in this <CODE>ColorModel</CODE>.
* @throws IllegalArgumentException If the component value for this
* <CODE>ColorModel</CODE> is signed
*/
public int getGreen(int pixel) {
return getRGBComponent(pixel, 1);
}
/**
* Returns the blue color component for the specified pixel, scaled
* from 0 to 255 in the default RGB ColorSpace, sRGB. A color conversion
* is done if necessary. The pixel value is specified as an int.
* The returned value will be a non
* pre-multiplied value. If the alpha is premultiplied, this method
* divides it out before returning the value (if the alpha value is 0,
* the blue value will be 0).
*
* @param pixel The pixel from which you want to get the blue color component.
*
* @return The blue color component for the specified pixel, as an int.
*
* @throws IllegalArgumentException If there is more than
* one component in this <CODE>ColorModel</CODE>.
* @throws IllegalArgumentException If the component value for this
* <CODE>ColorModel</CODE> is signed
*/
public int getBlue(int pixel) {
return getRGBComponent(pixel, 2);
}
/**
* Returns the alpha component for the specified pixel, scaled
* from 0 to 255. The pixel value is specified as an int.
*
* @param pixel The pixel from which you want to get the alpha component.
*
* @return The alpha component for the specified pixel, as an int.
*
* @throws IllegalArgumentException If there is more than
* one component in this <CODE>ColorModel</CODE>.
* @throws IllegalArgumentException If the component value for this
* <CODE>ColorModel</CODE> is signed
*/
public int getAlpha(int pixel) {
if (supportsAlpha == false) {
return 255;
}
if (numComponents > 1) {
throw new
IllegalArgumentException("More than one component per pixel");
}
if (signed) {
throw new
IllegalArgumentException("Component value is signed");
}
return (int) ((((float) pixel) / ((1<<nBits[0])-1)) * 255.0f + 0.5f);
}
/**
* Returns the color/alpha components of the pixel in the default
* RGB color model format. A color conversion is done if necessary.
* The returned value will be in a non pre-multiplied format. If
* the alpha is premultiplied, this method divides it out of the
* color components (if the alpha value is 0, the color values will be 0).
*
* @param pixel The pixel from which you want to get the color/alpha components.
*
* @return The color/alpha components for the specified pixel, as an int.
*
* @throws IllegalArgumentException If there is more than
* one component in this <CODE>ColorModel</CODE>.
* @throws IllegalArgumentException If the component value for this
* <CODE>ColorModel</CODE> is signed
*/
public int getRGB(int pixel) {
if (numComponents > 1) {
throw new
IllegalArgumentException("More than one component per pixel");
}
if (signed) {
throw new
IllegalArgumentException("Component value is signed");
}
return (getAlpha(pixel) << 24)
| (getRed(pixel) << 16)
| (getGreen(pixel) << 8)
| (getBlue(pixel) << 0);
}
private int extractComponent(Object inData, int idx, int precision) {
// Extract component idx from inData. The precision argument
// should be either 8 or 16. If it's 8, this method will return
// an 8-bit value. If it's 16, this method will return a 16-bit
// value for transferTypes other than TYPE_BYTE. For TYPE_BYTE,
// an 8-bit value will be returned.
// This method maps the input value corresponding to a
// normalized ColorSpace component value of 0.0 to 0, and the
// input value corresponding to a normalized ColorSpace
// component value of 1.0 to 2^n - 1 (where n is 8 or 16), so
// it is appropriate only for ColorSpaces with min/max component
// values of 0.0/1.0. This will be true for sRGB, the built-in
// Linear RGB and Linear Gray spaces, and any other ICC grayscale
// spaces for which we have precomputed LUTs.
boolean needAlpha = (supportsAlpha && isAlphaPremultiplied);
int alp = 0;
int comp;
int mask = (1 << nBits[idx]) - 1;
switch (transferType) {
// Note: we do no clamping of the pixel data here - we
// assume that the data is scaled properly
case DataBuffer.TYPE_SHORT: {
short sdata[] = (short[]) inData;
float scalefactor = (float) ((1 << precision) - 1);
if (needAlpha) {
short s = sdata[numColorComponents];
if (s != (short) 0) {
return (int) ((((float) sdata[idx]) /
((float) s)) * scalefactor + 0.5f);
} else {
return 0;
}
} else {
return (int) ((sdata[idx] / 32767.0f) * scalefactor + 0.5f);
}
}
case DataBuffer.TYPE_FLOAT: {
float fdata[] = (float[]) inData;
float scalefactor = (float) ((1 << precision) - 1);
if (needAlpha) {
float f = fdata[numColorComponents];
if (f != 0.0f) {
return (int) (((fdata[idx] / f) * scalefactor) + 0.5f);
} else {
return 0;
}
} else {
return (int) (fdata[idx] * scalefactor + 0.5f);
}
}
case DataBuffer.TYPE_DOUBLE: {
double ddata[] = (double[]) inData;
double scalefactor = (double) ((1 << precision) - 1);
if (needAlpha) {
double d = ddata[numColorComponents];
if (d != 0.0) {
return (int) (((ddata[idx] / d) * scalefactor) + 0.5);
} else {
return 0;
}
} else {
return (int) (ddata[idx] * scalefactor + 0.5);
}
}
case DataBuffer.TYPE_BYTE:
byte bdata[] = (byte[])inData;
comp = bdata[idx] & mask;
precision = 8;
if (needAlpha) {
alp = bdata[numColorComponents] & mask;
}
break;
case DataBuffer.TYPE_USHORT:
short usdata[] = (short[])inData;
comp = usdata[idx] & mask;
if (needAlpha) {
alp = usdata[numColorComponents] & mask;
}
break;
case DataBuffer.TYPE_INT:
int idata[] = (int[])inData;
comp = idata[idx];
if (needAlpha) {
alp = idata[numColorComponents];
}
break;
default:
throw new
UnsupportedOperationException("This method has not "+
"been implemented for transferType " + transferType);
}
if (needAlpha) {
if (alp != 0) {
float scalefactor = (float) ((1 << precision) - 1);
float fcomp = ((float) comp) / ((float)mask);
float invalp = ((float) ((1<<nBits[numColorComponents]) - 1)) /
((float) alp);
return (int) (fcomp * invalp * scalefactor + 0.5f);
} else {
return 0;
}
} else {
if (nBits[idx] != precision) {
float scalefactor = (float) ((1 << precision) - 1);
float fcomp = ((float) comp) / ((float)mask);
return (int) (fcomp * scalefactor + 0.5f);
}
return comp;
}
}
private int getRGBComponent(Object inData, int idx) {
if (needScaleInit) {
initScale();
}
if (is_sRGB_stdScale) {
return extractComponent(inData, idx, 8);
} else if (is_LinearRGB_stdScale) {
int lutidx = extractComponent(inData, idx, 16);
return tosRGB8LUT[lutidx] & 0xff;
} else if (is_ICCGray_stdScale) {
int lutidx = extractComponent(inData, 0, 16);
return tosRGB8LUT[lutidx] & 0xff;
}
// Not CS_sRGB, CS_LINEAR_RGB, or any TYPE_GRAY ICC_ColorSpace
float[] norm = getNormalizedComponents(inData, null, 0);
// Note that getNormalizedComponents returns non-premultiplied values
float[] rgb = colorSpace.toRGB(norm);
return (int) (rgb[idx] * 255.0f + 0.5f);
}
/**
* Returns the red color component for the specified pixel, scaled
* from 0 to 255 in the default RGB ColorSpace, sRGB. A color conversion
* is done if necessary. The <CODE>pixel</CODE> value is specified by an array
* of data elements of type <CODE>transferType</CODE> passed in as an object
* reference. The returned value will be a non pre-multiplied value. If the
* alpha is premultiplied, this method divides it out before returning
* the value (if the alpha value is 0, the red value will be 0). Since
* <code>ComponentColorModel</code> can be subclassed, subclasses
* inherit the implementation of this method and if they don't override
* it then they throw an exception if they use an unsupported
* <code>transferType</code>.
*
* @param inData The pixel from which you want to get the red color component,
* specified by an array of data elements of type <CODE>transferType</CODE>.
*
* @return The red color component for the specified pixel, as an int.
*
* @throws ClassCastException If <CODE>inData</CODE> is not a primitive array
* of type <CODE>transferType</CODE>.
* @throws ArrayIndexOutOfBoundsException if <CODE>inData</CODE> is not
* large enough to hold a pixel value for this
* <CODE>ColorModel</CODE>.
* @throws UnsupportedOperationException If the transfer type of
* this <CODE>ComponentColorModel</CODE>
* is not one of the supported transfer types:
* <CODE>DataBuffer.TYPE_BYTE</CODE>, <CODE>DataBuffer.TYPE_USHORT</CODE>,
* <CODE>DataBuffer.TYPE_INT</CODE>, <CODE>DataBuffer.TYPE_SHORT</CODE>,
* <CODE>DataBuffer.TYPE_FLOAT</CODE>, or <CODE>DataBuffer.TYPE_DOUBLE</CODE>.
*/
public int getRed(Object inData) {
return getRGBComponent(inData, 0);
}
/**
* Returns the green color component for the specified pixel, scaled
* from 0 to 255 in the default RGB <CODE>ColorSpace</CODE>, sRGB.
* A color conversion is done if necessary. The <CODE>pixel</CODE> value
* is specified by an array of data elements of type <CODE>transferType</CODE>
* passed in as an object reference. The returned value is a non pre-multiplied
* value. If the alpha is premultiplied, this method divides it out before
* returning the value (if the alpha value is 0, the green value will be 0).
* Since <code>ComponentColorModel</code> can be subclassed,
* subclasses inherit the implementation of this method and if they
* don't override it then they throw an exception if they use an
* unsupported <code>transferType</code>.
*
* @param inData The pixel from which you want to get the green color component,
* specified by an array of data elements of type <CODE>transferType</CODE>.
*
* @return The green color component for the specified pixel, as an int.
*
* @throws ClassCastException If <CODE>inData</CODE> is not a primitive array
* of type <CODE>transferType</CODE>.
* @throws ArrayIndexOutOfBoundsException if <CODE>inData</CODE> is not
* large enough to hold a pixel value for this
* <CODE>ColorModel</CODE>.
* @throws UnsupportedOperationException If the transfer type of
* this <CODE>ComponentColorModel</CODE>
* is not one of the supported transfer types:
* <CODE>DataBuffer.TYPE_BYTE</CODE>, <CODE>DataBuffer.TYPE_USHORT</CODE>,
* <CODE>DataBuffer.TYPE_INT</CODE>, <CODE>DataBuffer.TYPE_SHORT</CODE>,
* <CODE>DataBuffer.TYPE_FLOAT</CODE>, or <CODE>DataBuffer.TYPE_DOUBLE</CODE>.
*/
public int getGreen(Object inData) {
return getRGBComponent(inData, 1);
}
/**
* Returns the blue color component for the specified pixel, scaled
* from 0 to 255 in the default RGB <CODE>ColorSpace</CODE>, sRGB.
* A color conversion is done if necessary. The <CODE>pixel</CODE> value is
* specified by an array of data elements of type <CODE>transferType</CODE>
* passed in as an object reference. The returned value is a non pre-multiplied
* value. If the alpha is premultiplied, this method divides it out before
* returning the value (if the alpha value is 0, the blue value will be 0).
* Since <code>ComponentColorModel</code> can be subclassed,
* subclasses inherit the implementation of this method and if they
* don't override it then they throw an exception if they use an
* unsupported <code>transferType</code>.
*
* @param inData The pixel from which you want to get the blue color component,
* specified by an array of data elements of type <CODE>transferType</CODE>.
*
* @return The blue color component for the specified pixel, as an int.
*
* @throws ClassCastException If <CODE>inData</CODE> is not a primitive array
* of type <CODE>transferType</CODE>.
* @throws ArrayIndexOutOfBoundsException if <CODE>inData</CODE> is not
* large enough to hold a pixel value for this
* <CODE>ColorModel</CODE>.
* @throws UnsupportedOperationException If the transfer type of
* this <CODE>ComponentColorModel</CODE>
* is not one of the supported transfer types:
* <CODE>DataBuffer.TYPE_BYTE</CODE>, <CODE>DataBuffer.TYPE_USHORT</CODE>,
* <CODE>DataBuffer.TYPE_INT</CODE>, <CODE>DataBuffer.TYPE_SHORT</CODE>,
* <CODE>DataBuffer.TYPE_FLOAT</CODE>, or <CODE>DataBuffer.TYPE_DOUBLE</CODE>.
*/
public int getBlue(Object inData) {
return getRGBComponent(inData, 2);
}
/**
* Returns the alpha component for the specified pixel, scaled from
* 0 to 255. The pixel value is specified by an array of data
* elements of type <CODE>transferType</CODE> passed in as an
* object reference. Since <code>ComponentColorModel</code> can be
* subclassed, subclasses inherit the
* implementation of this method and if they don't override it then
* they throw an exception if they use an unsupported
* <code>transferType</code>.
*
* @param inData The pixel from which you want to get the alpha component,
* specified by an array of data elements of type <CODE>transferType</CODE>.
*
* @return The alpha component for the specified pixel, as an int.
*
* @throws ClassCastException If <CODE>inData</CODE> is not a primitive array
* of type <CODE>transferType</CODE>.
* @throws ArrayIndexOutOfBoundsException if <CODE>inData</CODE> is not
* large enough to hold a pixel value for this
* <CODE>ColorModel</CODE>.
* @throws UnsupportedOperationException If the transfer type of
* this <CODE>ComponentColorModel</CODE>
* is not one of the supported transfer types:
* <CODE>DataBuffer.TYPE_BYTE</CODE>, <CODE>DataBuffer.TYPE_USHORT</CODE>,
* <CODE>DataBuffer.TYPE_INT</CODE>, <CODE>DataBuffer.TYPE_SHORT</CODE>,
* <CODE>DataBuffer.TYPE_FLOAT</CODE>, or <CODE>DataBuffer.TYPE_DOUBLE</CODE>.
*/
public int getAlpha(Object inData) {
if (supportsAlpha == false) {
return 255;
}
int alpha = 0;
int aIdx = numColorComponents;
int mask = (1 << nBits[aIdx]) - 1;
switch (transferType) {
case DataBuffer.TYPE_SHORT:
short sdata[] = (short[])inData;
alpha = (int) ((sdata[aIdx] / 32767.0f) * 255.0f + 0.5f);
return alpha;
case DataBuffer.TYPE_FLOAT:
float fdata[] = (float[])inData;
alpha = (int) (fdata[aIdx] * 255.0f + 0.5f);
return alpha;
case DataBuffer.TYPE_DOUBLE:
double ddata[] = (double[])inData;
alpha = (int) (ddata[aIdx] * 255.0 + 0.5);
return alpha;
case DataBuffer.TYPE_BYTE:
byte bdata[] = (byte[])inData;
alpha = bdata[aIdx] & mask;
break;
case DataBuffer.TYPE_USHORT:
short usdata[] = (short[])inData;
alpha = usdata[aIdx] & mask;
break;
case DataBuffer.TYPE_INT:
int idata[] = (int[])inData;
alpha = idata[aIdx];
break;
default:
throw new
UnsupportedOperationException("This method has not "+
"been implemented for transferType " + transferType);
}
if (nBits[aIdx] == 8) {
return alpha;
} else {
return (int)
((((float) alpha) / ((float) ((1 << nBits[aIdx]) - 1))) *
255.0f + 0.5f);
}
}
/**
* Returns the color/alpha components for the specified pixel in the
* default RGB color model format. A color conversion is done if
* necessary. The pixel value is specified by an
* array of data elements of type <CODE>transferType</CODE> passed
* in as an object reference.
* The returned value is in a non pre-multiplied format. If
* the alpha is premultiplied, this method divides it out of the
* color components (if the alpha value is 0, the color values will be 0).
* Since <code>ComponentColorModel</code> can be subclassed,
* subclasses inherit the implementation of this method and if they
* don't override it then they throw an exception if they use an
* unsupported <code>transferType</code>.
*
* @param inData The pixel from which you want to get the color/alpha components,
* specified by an array of data elements of type <CODE>transferType</CODE>.
*
* @return The color/alpha components for the specified pixel, as an int.
*
* @throws ClassCastException If <CODE>inData</CODE> is not a primitive array
* of type <CODE>transferType</CODE>.
* @throws ArrayIndexOutOfBoundsException if <CODE>inData</CODE> is not
* large enough to hold a pixel value for this
* <CODE>ColorModel</CODE>.
* @throws UnsupportedOperationException If the transfer type of
* this <CODE>ComponentColorModel</CODE>
* is not one of the supported transfer types:
* <CODE>DataBuffer.TYPE_BYTE</CODE>, <CODE>DataBuffer.TYPE_USHORT</CODE>,
* <CODE>DataBuffer.TYPE_INT</CODE>, <CODE>DataBuffer.TYPE_SHORT</CODE>,
* <CODE>DataBuffer.TYPE_FLOAT</CODE>, or <CODE>DataBuffer.TYPE_DOUBLE</CODE>.
* @see ColorModel#getRGBdefault
*/
public int getRGB(Object inData) {
if (needScaleInit) {
initScale();
}
if (is_sRGB_stdScale || is_LinearRGB_stdScale) {
return (getAlpha(inData) << 24)
| (getRed(inData) << 16)
| (getGreen(inData) << 8)
| (getBlue(inData));
} else if (colorSpaceType == ColorSpace.TYPE_GRAY) {
int gray = getRed(inData); // Red sRGB component should equal
// green and blue components
return (getAlpha(inData) << 24)
| (gray << 16)
| (gray << 8)
| gray;
}
float[] norm = getNormalizedComponents(inData, null, 0);
// Note that getNormalizedComponents returns non-premult values
float[] rgb = colorSpace.toRGB(norm);
return (getAlpha(inData) << 24)
| (((int) (rgb[0] * 255.0f + 0.5f)) << 16)
| (((int) (rgb[1] * 255.0f + 0.5f)) << 8)
| (((int) (rgb[2] * 255.0f + 0.5f)) << 0);
}
/**
* Returns a data element array representation of a pixel in this
* <CODE>ColorModel</CODE>, given an integer pixel representation
* in the default RGB color model.
* This array can then be passed to the <CODE>setDataElements</CODE>
* method of a <CODE>WritableRaster</CODE> object. If the
* <CODE>pixel</CODE>
* parameter is null, a new array is allocated. Since
* <code>ComponentColorModel</code> can be subclassed, subclasses
* inherit the implementation of this method and if they don't
* override it then
* they throw an exception if they use an unsupported
* <code>transferType</code>.
*
* @param rgb the integer representation of the pixel in the RGB
* color model
* @param pixel the specified pixel
* @return The data element array representation of a pixel
* in this <CODE>ColorModel</CODE>.
* @throws ClassCastException If <CODE>pixel</CODE> is not null and
* is not a primitive array of type <CODE>transferType</CODE>.
* @throws ArrayIndexOutOfBoundsException If <CODE>pixel</CODE> is
* not large enough to hold a pixel value for this
* <CODE>ColorModel</CODE>.
* @throws UnsupportedOperationException If the transfer type of
* this <CODE>ComponentColorModel</CODE>
* is not one of the supported transfer types:
* <CODE>DataBuffer.TYPE_BYTE</CODE>, <CODE>DataBuffer.TYPE_USHORT</CODE>,
* <CODE>DataBuffer.TYPE_INT</CODE>, <CODE>DataBuffer.TYPE_SHORT</CODE>,
* <CODE>DataBuffer.TYPE_FLOAT</CODE>, or <CODE>DataBuffer.TYPE_DOUBLE</CODE>.
*
* @see WritableRaster#setDataElements
* @see SampleModel#setDataElements
*/
public Object getDataElements(int rgb, Object pixel) {
// REMIND: Use rendering hints?
int red, grn, blu, alp;
red = (rgb>>16) & 0xff;
grn = (rgb>>8) & 0xff;
blu = rgb & 0xff;
if (needScaleInit) {
initScale();
}
if (signed) {
// Handle SHORT, FLOAT, & DOUBLE here
switch(transferType) {
case DataBuffer.TYPE_SHORT:
{
short sdata[];
if (pixel == null) {
sdata = new short[numComponents];
} else {
sdata = (short[])pixel;
}
float factor;
if (is_sRGB_stdScale || is_LinearRGB_stdScale) {
factor = 32767.0f / 255.0f;
if (is_LinearRGB_stdScale) {
red = fromsRGB8LUT16[red] & 0xffff;
grn = fromsRGB8LUT16[grn] & 0xffff;
blu = fromsRGB8LUT16[blu] & 0xffff;
factor = 32767.0f / 65535.0f;
}
if (supportsAlpha) {
alp = (rgb>>24) & 0xff;
sdata[3] =
(short) (alp * (32767.0f / 255.0f) + 0.5f);
if (isAlphaPremultiplied) {
factor = alp * factor * (1.0f / 255.0f);
}
}
sdata[0] = (short) (red * factor + 0.5f);
sdata[1] = (short) (grn * factor + 0.5f);
sdata[2] = (short) (blu * factor + 0.5f);
} else if (is_LinearGray_stdScale) {
red = fromsRGB8LUT16[red] & 0xffff;
grn = fromsRGB8LUT16[grn] & 0xffff;
blu = fromsRGB8LUT16[blu] & 0xffff;
float gray = ((0.2125f * red) +
(0.7154f * grn) +
(0.0721f * blu)) / 65535.0f;
factor = 32767.0f;
if (supportsAlpha) {
alp = (rgb>>24) & 0xff;
sdata[1] =
(short) (alp * (32767.0f / 255.0f) + 0.5f);
if (isAlphaPremultiplied) {
factor = alp * factor * (1.0f / 255.0f);
}
}
sdata[0] = (short) (gray * factor + 0.5f);
} else if (is_ICCGray_stdScale) {
red = fromsRGB8LUT16[red] & 0xffff;
grn = fromsRGB8LUT16[grn] & 0xffff;
blu = fromsRGB8LUT16[blu] & 0xffff;
int gray = (int) ((0.2125f * red) +
(0.7154f * grn) +
(0.0721f * blu) + 0.5f);
gray = fromLinearGray16ToOtherGray16LUT[gray] & 0xffff;
factor = 32767.0f / 65535.0f;
if (supportsAlpha) {
alp = (rgb>>24) & 0xff;
sdata[1] =
(short) (alp * (32767.0f / 255.0f) + 0.5f);
if (isAlphaPremultiplied) {
factor = alp * factor * (1.0f / 255.0f);
}
}
sdata[0] = (short) (gray * factor + 0.5f);
} else {
factor = 1.0f / 255.0f;
float norm[] = new float[3];
norm[0] = red * factor;
norm[1] = grn * factor;
norm[2] = blu * factor;
norm = colorSpace.fromRGB(norm);
if (nonStdScale) {
for (int i = 0; i < numColorComponents; i++) {
norm[i] = (norm[i] - compOffset[i]) *
compScale[i];
// REMIND: need to analyze whether this
// clamping is necessary
if (norm[i] < 0.0f) {
norm[i] = 0.0f;
}
if (norm[i] > 1.0f) {
norm[i] = 1.0f;
}
}
}
factor = 32767.0f;
if (supportsAlpha) {
alp = (rgb>>24) & 0xff;
sdata[numColorComponents] =
(short) (alp * (32767.0f / 255.0f) + 0.5f);
if (isAlphaPremultiplied) {
factor *= alp * (1.0f / 255.0f);
}
}
for (int i = 0; i < numColorComponents; i++) {
sdata[i] = (short) (norm[i] * factor + 0.5f);
}
}
return sdata;
}
case DataBuffer.TYPE_FLOAT:
{
float fdata[];
if (pixel == null) {
fdata = new float[numComponents];
} else {
fdata = (float[])pixel;
}
float factor;
if (is_sRGB_stdScale || is_LinearRGB_stdScale) {
if (is_LinearRGB_stdScale) {
red = fromsRGB8LUT16[red] & 0xffff;
grn = fromsRGB8LUT16[grn] & 0xffff;
blu = fromsRGB8LUT16[blu] & 0xffff;
factor = 1.0f / 65535.0f;
} else {
factor = 1.0f / 255.0f;
}
if (supportsAlpha) {
alp = (rgb>>24) & 0xff;
fdata[3] = alp * (1.0f / 255.0f);
if (isAlphaPremultiplied) {
factor *= fdata[3];
}
}
fdata[0] = red * factor;
fdata[1] = grn * factor;
fdata[2] = blu * factor;
} else if (is_LinearGray_stdScale) {
red = fromsRGB8LUT16[red] & 0xffff;
grn = fromsRGB8LUT16[grn] & 0xffff;
blu = fromsRGB8LUT16[blu] & 0xffff;
fdata[0] = ((0.2125f * red) +
(0.7154f * grn) +
(0.0721f * blu)) / 65535.0f;
if (supportsAlpha) {
alp = (rgb>>24) & 0xff;
fdata[1] = alp * (1.0f / 255.0f);
if (isAlphaPremultiplied) {
fdata[0] *= fdata[1];
}
}
} else if (is_ICCGray_stdScale) {
red = fromsRGB8LUT16[red] & 0xffff;
grn = fromsRGB8LUT16[grn] & 0xffff;
blu = fromsRGB8LUT16[blu] & 0xffff;
int gray = (int) ((0.2125f * red) +
(0.7154f * grn) +
(0.0721f * blu) + 0.5f);
fdata[0] = (fromLinearGray16ToOtherGray16LUT[gray] &
0xffff) / 65535.0f;
if (supportsAlpha) {
alp = (rgb>>24) & 0xff;
fdata[1] = alp * (1.0f / 255.0f);
if (isAlphaPremultiplied) {
fdata[0] *= fdata[1];
}
}
} else {
float norm[] = new float[3];
factor = 1.0f / 255.0f;
norm[0] = red * factor;
norm[1] = grn * factor;
norm[2] = blu * factor;
norm = colorSpace.fromRGB(norm);
if (supportsAlpha) {
alp = (rgb>>24) & 0xff;
fdata[numColorComponents] = alp * factor;
if (isAlphaPremultiplied) {
factor *= alp;
for (int i = 0; i < numColorComponents; i++) {
norm[i] *= factor;
}
}
}
for (int i = 0; i < numColorComponents; i++) {
fdata[i] = norm[i];
}
}
return fdata;
}
case DataBuffer.TYPE_DOUBLE:
{
double ddata[];
if (pixel == null) {
ddata = new double[numComponents];
} else {
ddata = (double[])pixel;
}
if (is_sRGB_stdScale || is_LinearRGB_stdScale) {
double factor;
if (is_LinearRGB_stdScale) {
red = fromsRGB8LUT16[red] & 0xffff;
grn = fromsRGB8LUT16[grn] & 0xffff;
blu = fromsRGB8LUT16[blu] & 0xffff;
factor = 1.0 / 65535.0;
} else {
factor = 1.0 / 255.0;
}
if (supportsAlpha) {
alp = (rgb>>24) & 0xff;
ddata[3] = alp * (1.0 / 255.0);
if (isAlphaPremultiplied) {
factor *= ddata[3];
}
}
ddata[0] = red * factor;
ddata[1] = grn * factor;
ddata[2] = blu * factor;
} else if (is_LinearGray_stdScale) {
red = fromsRGB8LUT16[red] & 0xffff;
grn = fromsRGB8LUT16[grn] & 0xffff;
blu = fromsRGB8LUT16[blu] & 0xffff;
ddata[0] = ((0.2125 * red) +
(0.7154 * grn) +
(0.0721 * blu)) / 65535.0;
if (supportsAlpha) {
alp = (rgb>>24) & 0xff;
ddata[1] = alp * (1.0 / 255.0);
if (isAlphaPremultiplied) {
ddata[0] *= ddata[1];
}
}
} else if (is_ICCGray_stdScale) {
red = fromsRGB8LUT16[red] & 0xffff;
grn = fromsRGB8LUT16[grn] & 0xffff;
blu = fromsRGB8LUT16[blu] & 0xffff;
int gray = (int) ((0.2125f * red) +
(0.7154f * grn) +
(0.0721f * blu) + 0.5f);
ddata[0] = (fromLinearGray16ToOtherGray16LUT[gray] &
0xffff) / 65535.0;
if (supportsAlpha) {
alp = (rgb>>24) & 0xff;
ddata[1] = alp * (1.0 / 255.0);
if (isAlphaPremultiplied) {
ddata[0] *= ddata[1];
}
}
} else {
float factor = 1.0f / 255.0f;
float norm[] = new float[3];
norm[0] = red * factor;
norm[1] = grn * factor;
norm[2] = blu * factor;
norm = colorSpace.fromRGB(norm);
if (supportsAlpha) {
alp = (rgb>>24) & 0xff;
ddata[numColorComponents] = alp * (1.0 / 255.0);
if (isAlphaPremultiplied) {
factor *= alp;
for (int i = 0; i < numColorComponents; i++) {
norm[i] *= factor;
}
}
}
for (int i = 0; i < numColorComponents; i++) {
ddata[i] = norm[i];
}
}
return ddata;
}
}
}
// Handle BYTE, USHORT, & INT here
//REMIND: maybe more efficient not to use int array for
//DataBuffer.TYPE_USHORT and DataBuffer.TYPE_INT
int intpixel[];
if (transferType == DataBuffer.TYPE_INT &&
pixel != null) {
intpixel = (int[])pixel;
} else {
intpixel = new int[numComponents];
}
if (is_sRGB_stdScale || is_LinearRGB_stdScale) {
int precision;
float factor;
if (is_LinearRGB_stdScale) {
if (transferType == DataBuffer.TYPE_BYTE) {
red = fromsRGB8LUT8[red] & 0xff;
grn = fromsRGB8LUT8[grn] & 0xff;
blu = fromsRGB8LUT8[blu] & 0xff;
precision = 8;
factor = 1.0f / 255.0f;
} else {
red = fromsRGB8LUT16[red] & 0xffff;
grn = fromsRGB8LUT16[grn] & 0xffff;
blu = fromsRGB8LUT16[blu] & 0xffff;
precision = 16;
factor = 1.0f / 65535.0f;
}
} else {
precision = 8;
factor = 1.0f / 255.0f;
}
if (supportsAlpha) {
alp = (rgb>>24)&0xff;
if (nBits[3] == 8) {
intpixel[3] = alp;
}
else {
intpixel[3] = (int)
(alp * (1.0f / 255.0f) * ((1<<nBits[3]) - 1) + 0.5f);
}
if (isAlphaPremultiplied) {
factor *= (alp * (1.0f / 255.0f));
precision = -1; // force component calculations below
}
}
if (nBits[0] == precision) {
intpixel[0] = red;
}
else {
intpixel[0] = (int) (red * factor * ((1<<nBits[0]) - 1) + 0.5f);
}
if (nBits[1] == precision) {
intpixel[1] = (int)(grn);
}
else {
intpixel[1] = (int) (grn * factor * ((1<<nBits[1]) - 1) + 0.5f);
}
if (nBits[2] == precision) {
intpixel[2] = (int)(blu);
}
else {
intpixel[2] = (int) (blu * factor * ((1<<nBits[2]) - 1) + 0.5f);
}
} else if (is_LinearGray_stdScale) {
red = fromsRGB8LUT16[red] & 0xffff;
grn = fromsRGB8LUT16[grn] & 0xffff;
blu = fromsRGB8LUT16[blu] & 0xffff;
float gray = ((0.2125f * red) +
(0.7154f * grn) +
(0.0721f * blu)) / 65535.0f;
if (supportsAlpha) {
alp = (rgb>>24) & 0xff;
if (nBits[1] == 8) {
intpixel[1] = alp;
} else {
intpixel[1] = (int) (alp * (1.0f / 255.0f) *
((1 << nBits[1]) - 1) + 0.5f);
}
if (isAlphaPremultiplied) {
gray *= (alp * (1.0f / 255.0f));
}
}
intpixel[0] = (int) (gray * ((1 << nBits[0]) - 1) + 0.5f);
} else if (is_ICCGray_stdScale) {
red = fromsRGB8LUT16[red] & 0xffff;
grn = fromsRGB8LUT16[grn] & 0xffff;
blu = fromsRGB8LUT16[blu] & 0xffff;
int gray16 = (int) ((0.2125f * red) +
(0.7154f * grn) +
(0.0721f * blu) + 0.5f);
float gray = (fromLinearGray16ToOtherGray16LUT[gray16] &
0xffff) / 65535.0f;
if (supportsAlpha) {
alp = (rgb>>24) & 0xff;
if (nBits[1] == 8) {
intpixel[1] = alp;
} else {
intpixel[1] = (int) (alp * (1.0f / 255.0f) *
((1 << nBits[1]) - 1) + 0.5f);
}
if (isAlphaPremultiplied) {
gray *= (alp * (1.0f / 255.0f));
}
}
intpixel[0] = (int) (gray * ((1 << nBits[0]) - 1) + 0.5f);
} else {
// Need to convert the color
float[] norm = new float[3];
float factor = 1.0f / 255.0f;
norm[0] = red * factor;
norm[1] = grn * factor;
norm[2] = blu * factor;
norm = colorSpace.fromRGB(norm);
if (nonStdScale) {
for (int i = 0; i < numColorComponents; i++) {
norm[i] = (norm[i] - compOffset[i]) *
compScale[i];
// REMIND: need to analyze whether this
// clamping is necessary
if (norm[i] < 0.0f) {
norm[i] = 0.0f;
}
if (norm[i] > 1.0f) {
norm[i] = 1.0f;
}
}
}
if (supportsAlpha) {
alp = (rgb>>24) & 0xff;
if (nBits[numColorComponents] == 8) {
intpixel[numColorComponents] = alp;
}
else {
intpixel[numColorComponents] =
(int) (alp * factor *
((1<<nBits[numColorComponents]) - 1) + 0.5f);
}
if (isAlphaPremultiplied) {
factor *= alp;
for (int i = 0; i < numColorComponents; i++) {
norm[i] *= factor;
}
}
}
for (int i = 0; i < numColorComponents; i++) {
intpixel[i] = (int) (norm[i] * ((1<<nBits[i]) - 1) + 0.5f);
}
}
switch (transferType) {
case DataBuffer.TYPE_BYTE: {
byte bdata[];
if (pixel == null) {
bdata = new byte[numComponents];
} else {
bdata = (byte[])pixel;
}
for (int i = 0; i < numComponents; i++) {
bdata[i] = (byte)(0xff&intpixel[i]);
}
return bdata;
}
case DataBuffer.TYPE_USHORT:{
short sdata[];
if (pixel == null) {
sdata = new short[numComponents];
} else {
sdata = (short[])pixel;
}
for (int i = 0; i < numComponents; i++) {
sdata[i] = (short)(intpixel[i]&0xffff);
}
return sdata;
}
case DataBuffer.TYPE_INT:
if (maxBits > 23) {
// fix 4412670 - for components of 24 or more bits
// some calculations done above with float precision
// may lose enough precision that the integer result
// overflows nBits, so we need to clamp.
for (int i = 0; i < numComponents; i++) {
if (intpixel[i] > ((1<<nBits[i]) - 1)) {
intpixel[i] = (1<<nBits[i]) - 1;
}
}
}
return intpixel;
}
throw new IllegalArgumentException("This method has not been "+
"implemented for transferType " + transferType);
}
/** Returns an array of unnormalized color/alpha components given a pixel
* in this <CODE>ColorModel</CODE>.
* An IllegalArgumentException is thrown if the component value for this
* <CODE>ColorModel</CODE> is not conveniently representable in the
* unnormalized form. Color/alpha components are stored
* in the <CODE>components</CODE> array starting at <CODE>offset</CODE>
* (even if the array is allocated by this method).
*
* @param pixel The pixel value specified as an integer.
* @param components An integer array in which to store the unnormalized
* color/alpha components. If the <CODE>components</CODE> array is null,
* a new array is allocated.
* @param offset An offset into the <CODE>components</CODE> array.
*
* @return The components array.
*
* @throws IllegalArgumentException If there is more than one
* component in this <CODE>ColorModel</CODE>.
* @throws IllegalArgumentException If this
* <CODE>ColorModel</CODE> does not support the unnormalized form
* @throws ArrayIndexOutOfBoundsException If the <CODE>components</CODE>
* array is not null and is not large enough to hold all the color and
* alpha components (starting at offset).
*/
public int[] getComponents(int pixel, int[] components, int offset) {
if (numComponents > 1) {
throw new
IllegalArgumentException("More than one component per pixel");
}
if (needScaleInit) {
initScale();
}
if (noUnnorm) {
throw new
IllegalArgumentException(
"This ColorModel does not support the unnormalized form");
}
if (components == null) {
components = new int[offset+1];
}
components[offset+0] = (pixel & ((1<<nBits[0]) - 1));
return components;
}
/**
* Returns an array of unnormalized color/alpha components given a pixel
* in this <CODE>ColorModel</CODE>. The pixel value is specified by an
* array of data elements of type <CODE>transferType</CODE> passed in as
* an object reference.
* An IllegalArgumentException is thrown if the component values for this
* <CODE>ColorModel</CODE> are not conveniently representable in the
* unnormalized form.
* Color/alpha components are stored in the <CODE>components</CODE> array
* starting at <CODE>offset</CODE> (even if the array is allocated by
* this method). Since <code>ComponentColorModel</code> can be
* subclassed, subclasses inherit the
* implementation of this method and if they don't override it then
* this method might throw an exception if they use an unsupported
* <code>transferType</code>.
*
* @param pixel A pixel value specified by an array of data elements of
* type <CODE>transferType</CODE>.
* @param components An integer array in which to store the unnormalized
* color/alpha components. If the <CODE>components</CODE> array is null,
* a new array is allocated.
* @param offset An offset into the <CODE>components</CODE> array.
*
* @return The <CODE>components</CODE> array.
*
* @throws IllegalArgumentException If this
* <CODE>ComponentColorModel</CODE> does not support the unnormalized form
* @throws UnsupportedOperationException in some cases iff the
* transfer type of this <CODE>ComponentColorModel</CODE>
* is not one of the following transfer types:
* <CODE>DataBuffer.TYPE_BYTE</CODE>, <CODE>DataBuffer.TYPE_USHORT</CODE>,
* or <CODE>DataBuffer.TYPE_INT</CODE>.
* @throws ClassCastException If <CODE>pixel</CODE> is not a primitive
* array of type <CODE>transferType</CODE>.
* @throws IllegalArgumentException If the <CODE>components</CODE> array is
* not null and is not large enough to hold all the color and alpha
* components (starting at offset), or if <CODE>pixel</CODE> is not large
* enough to hold a pixel value for this ColorModel.
*/
public int[] getComponents(Object pixel, int[] components, int offset) {
int intpixel[];
if (needScaleInit) {
initScale();
}
if (noUnnorm) {
throw new
IllegalArgumentException(
"This ColorModel does not support the unnormalized form");
}
if (pixel instanceof int[]) {
intpixel = (int[])pixel;
} else {
intpixel = DataBuffer.toIntArray(pixel);
if (intpixel == null) {
throw new UnsupportedOperationException("This method has not been "+
"implemented for transferType " + transferType);
}
}
if (intpixel.length < numComponents) {
throw new IllegalArgumentException
("Length of pixel array < number of components in model");
}
if (components == null) {
components = new int[offset+numComponents];
}
else if ((components.length-offset) < numComponents) {
throw new IllegalArgumentException
("Length of components array < number of components in model");
}
System.arraycopy(intpixel, 0, components, offset, numComponents);
return components;
}
/**
* Returns an array of all of the color/alpha components in unnormalized
* form, given a normalized component array. Unnormalized components
* are unsigned integral values between 0 and 2<sup>n</sup> - 1, where
* n is the number of bits for a particular component. Normalized
* components are float values between a per component minimum and
* maximum specified by the <code>ColorSpace</code> object for this
* <code>ColorModel</code>. An <code>IllegalArgumentException</code>
* will be thrown if color component values for this
* <code>ColorModel</code> are not conveniently representable in the
* unnormalized form. If the
* <code>components</code> array is <code>null</code>, a new array
* will be allocated. The <code>components</code> array will
* be returned. Color/alpha components are stored in the
* <code>components</code> array starting at <code>offset</code> (even
* if the array is allocated by this method). An
* <code>ArrayIndexOutOfBoundsException</code> is thrown if the
* <code>components</code> array is not <code>null</code> and is not
* large enough to hold all the color and alpha
* components (starting at <code>offset</code>). An
* <code>IllegalArgumentException</code> is thrown if the
* <code>normComponents</code> array is not large enough to hold
* all the color and alpha components starting at
* <code>normOffset</code>.
* @param normComponents an array containing normalized components
* @param normOffset the offset into the <code>normComponents</code>
* array at which to start retrieving normalized components
* @param components an array that receives the components from
* <code>normComponents</code>
* @param offset the index into <code>components</code> at which to
* begin storing normalized components from
* <code>normComponents</code>
* @return an array containing unnormalized color and alpha
* components.
* @throws IllegalArgumentException If this
* <CODE>ComponentColorModel</CODE> does not support the unnormalized form
* @throws IllegalArgumentException if the length of
* <code>normComponents</code> minus <code>normOffset</code>
* is less than <code>numComponents</code>
*/
public int[] getUnnormalizedComponents(float[] normComponents,
int normOffset,
int[] components, int offset) {
if (needScaleInit) {
initScale();
}
if (noUnnorm) {
throw new
IllegalArgumentException(
"This ColorModel does not support the unnormalized form");
}
return super.getUnnormalizedComponents(normComponents, normOffset,
components, offset);
}
/**
* Returns an array of all of the color/alpha components in normalized
* form, given an unnormalized component array. Unnormalized components
* are unsigned integral values between 0 and 2<sup>n</sup> - 1, where
* n is the number of bits for a particular component. Normalized
* components are float values between a per component minimum and
* maximum specified by the <code>ColorSpace</code> object for this
* <code>ColorModel</code>. An <code>IllegalArgumentException</code>
* will be thrown if color component values for this
* <code>ColorModel</code> are not conveniently representable in the
* unnormalized form. If the
* <code>normComponents</code> array is <code>null</code>, a new array
* will be allocated. The <code>normComponents</code> array
* will be returned. Color/alpha components are stored in the
* <code>normComponents</code> array starting at
* <code>normOffset</code> (even if the array is allocated by this
* method). An <code>ArrayIndexOutOfBoundsException</code> is thrown
* if the <code>normComponents</code> array is not <code>null</code>
* and is not large enough to hold all the color and alpha components
* (starting at <code>normOffset</code>). An
* <code>IllegalArgumentException</code> is thrown if the
* <code>components</code> array is not large enough to hold all the
* color and alpha components starting at <code>offset</code>.
* @param components an array containing unnormalized components
* @param offset the offset into the <code>components</code> array at
* which to start retrieving unnormalized components
* @param normComponents an array that receives the normalized components
* @param normOffset the index into <code>normComponents</code> at
* which to begin storing normalized components
* @return an array containing normalized color and alpha
* components.
* @throws IllegalArgumentException If this
* <CODE>ComponentColorModel</CODE> does not support the unnormalized form
*/
public float[] getNormalizedComponents(int[] components, int offset,
float[] normComponents,
int normOffset) {
if (needScaleInit) {
initScale();
}
if (noUnnorm) {
throw new
IllegalArgumentException(
"This ColorModel does not support the unnormalized form");
}
return super.getNormalizedComponents(components, offset,
normComponents, normOffset);
}
/**
* Returns a pixel value represented as an int in this <CODE>ColorModel</CODE>,
* given an array of unnormalized color/alpha components.
*
* @param components An array of unnormalized color/alpha components.
* @param offset An offset into the <CODE>components</CODE> array.
*
* @return A pixel value represented as an int.
*
* @throws IllegalArgumentException If there is more than one component
* in this <CODE>ColorModel</CODE>.
* @throws IllegalArgumentException If this
* <CODE>ComponentColorModel</CODE> does not support the unnormalized form
*/
public int getDataElement(int[] components, int offset) {
if (needScaleInit) {
initScale();
}
if (numComponents == 1) {
if (noUnnorm) {
throw new
IllegalArgumentException(
"This ColorModel does not support the unnormalized form");
}
return components[offset+0];
}
throw new IllegalArgumentException("This model returns "+
numComponents+
" elements in the pixel array.");
}
/**
* Returns a data element array representation of a pixel in this
* <CODE>ColorModel</CODE>, given an array of unnormalized color/alpha
* components. This array can then be passed to the <CODE>setDataElements</CODE>
* method of a <CODE>WritableRaster</CODE> object.
*
* @param components An array of unnormalized color/alpha components.
* @param offset The integer offset into the <CODE>components</CODE> array.
* @param obj The object in which to store the data element array
* representation of the pixel. If <CODE>obj</CODE> variable is null,
* a new array is allocated. If <CODE>obj</CODE> is not null, it must
* be a primitive array of type <CODE>transferType</CODE>. An
* <CODE>ArrayIndexOutOfBoundsException</CODE> is thrown if
* <CODE>obj</CODE> is not large enough to hold a pixel value
* for this <CODE>ColorModel</CODE>. Since
* <code>ComponentColorModel</code> can be subclassed, subclasses
* inherit the implementation of this method and if they don't
* override it then they throw an exception if they use an
* unsupported <code>transferType</code>.
*
* @return The data element array representation of a pixel
* in this <CODE>ColorModel</CODE>.
*
* @throws IllegalArgumentException If the components array
* is not large enough to hold all the color and alpha components
* (starting at offset).
* @throws ClassCastException If <CODE>obj</CODE> is not null and is not a
* primitive array of type <CODE>transferType</CODE>.
* @throws ArrayIndexOutOfBoundsException If <CODE>obj</CODE> is not large
* enough to hold a pixel value for this <CODE>ColorModel</CODE>.
* @throws IllegalArgumentException If this
* <CODE>ComponentColorModel</CODE> does not support the unnormalized form
* @throws UnsupportedOperationException If the transfer type of
* this <CODE>ComponentColorModel</CODE>
* is not one of the following transfer types:
* <CODE>DataBuffer.TYPE_BYTE</CODE>, <CODE>DataBuffer.TYPE_USHORT</CODE>,
* or <CODE>DataBuffer.TYPE_INT</CODE>.
*
* @see WritableRaster#setDataElements
* @see SampleModel#setDataElements
*/
public Object getDataElements(int[] components, int offset, Object obj) {
if (needScaleInit) {
initScale();
}
if (noUnnorm) {
throw new
IllegalArgumentException(
"This ColorModel does not support the unnormalized form");
}
if ((components.length-offset) < numComponents) {
throw new IllegalArgumentException("Component array too small"+
" (should be "+numComponents);
}
switch(transferType) {
case DataBuffer.TYPE_INT:
{
int[] pixel;
if (obj == null) {
pixel = new int[numComponents];
}
else {
pixel = (int[]) obj;
}
System.arraycopy(components, offset, pixel, 0,
numComponents);
return pixel;
}
case DataBuffer.TYPE_BYTE:
{
byte[] pixel;
if (obj == null) {
pixel = new byte[numComponents];
}
else {
pixel = (byte[]) obj;
}
for (int i=0; i < numComponents; i++) {
pixel[i] = (byte) (components[offset+i]&0xff);
}
return pixel;
}
case DataBuffer.TYPE_USHORT:
{
short[] pixel;
if (obj == null) {
pixel = new short[numComponents];
}
else {
pixel = (short[]) obj;
}
for (int i=0; i < numComponents; i++) {
pixel[i] = (short) (components[offset+i]&0xffff);
}
return pixel;
}
default:
throw new UnsupportedOperationException("This method has not been "+
"implemented for transferType " +
transferType);
}
}
/**
* Returns a pixel value represented as an <code>int</code> in this
* <code>ColorModel</code>, given an array of normalized color/alpha
* components. This method will throw an
* <code>IllegalArgumentException</code> if pixel values for this
* <code>ColorModel</code> are not conveniently representable as a
* single <code>int</code>. An
* <code>ArrayIndexOutOfBoundsException</code> is thrown if the
* <code>normComponents</code> array is not large enough to hold all the
* color and alpha components (starting at <code>normOffset</code>).
* @param normComponents an array of normalized color and alpha
* components
* @param normOffset the index into <code>normComponents</code> at which to
* begin retrieving the color and alpha components
* @return an <code>int</code> pixel value in this
* <code>ColorModel</code> corresponding to the specified components.
* @throws IllegalArgumentException if
* pixel values for this <code>ColorModel</code> are not
* conveniently representable as a single <code>int</code>
* @throws ArrayIndexOutOfBoundsException if
* the <code>normComponents</code> array is not large enough to
* hold all of the color and alpha components starting at
* <code>normOffset</code>
* @since 1.4
*/
public int getDataElement(float[] normComponents, int normOffset) {
if (numComponents > 1) {
throw new
IllegalArgumentException("More than one component per pixel");
}
if (signed) {
throw new
IllegalArgumentException("Component value is signed");
}
if (needScaleInit) {
initScale();
}
Object pixel = getDataElements(normComponents, normOffset, null);
switch (transferType) {
case DataBuffer.TYPE_BYTE:
{
byte bpixel[] = (byte[]) pixel;
return bpixel[0] & 0xff;
}
case DataBuffer.TYPE_USHORT:
{
short[] uspixel = (short[]) pixel;
return uspixel[0] & 0xffff;
}
case DataBuffer.TYPE_INT:
{
int[] ipixel = (int[]) pixel;
return ipixel[0];
}
default:
throw new UnsupportedOperationException("This method has not been "
+ "implemented for transferType " + transferType);
}
}
/**
* Returns a data element array representation of a pixel in this
* <code>ColorModel</code>, given an array of normalized color/alpha
* components. This array can then be passed to the
* <code>setDataElements</code> method of a <code>WritableRaster</code>
* object. An <code>ArrayIndexOutOfBoundsException</code> is thrown
* if the <code>normComponents</code> array is not large enough to hold
* all the color and alpha components (starting at
* <code>normOffset</code>). If the <code>obj</code> variable is
* <code>null</code>, a new array will be allocated. If
* <code>obj</code> is not <code>null</code>, it must be a primitive
* array of type transferType; otherwise, a
* <code>ClassCastException</code> is thrown. An
* <code>ArrayIndexOutOfBoundsException</code> is thrown if
* <code>obj</code> is not large enough to hold a pixel value for this
* <code>ColorModel</code>.
* @param normComponents an array of normalized color and alpha
* components
* @param normOffset the index into <code>normComponents</code> at which to
* begin retrieving color and alpha components
* @param obj a primitive data array to hold the returned pixel
* @return an <code>Object</code> which is a primitive data array
* representation of a pixel
* @throws ClassCastException if <code>obj</code>
* is not a primitive array of type <code>transferType</code>
* @throws ArrayIndexOutOfBoundsException if
* <code>obj</code> is not large enough to hold a pixel value
* for this <code>ColorModel</code> or the <code>normComponents</code>
* array is not large enough to hold all of the color and alpha
* components starting at <code>normOffset</code>
* @see WritableRaster#setDataElements
* @see SampleModel#setDataElements
* @since 1.4
*/
public Object getDataElements(float[] normComponents, int normOffset,
Object obj) {
boolean needAlpha = supportsAlpha && isAlphaPremultiplied;
float[] stdNormComponents;
if (needScaleInit) {
initScale();
}
if (nonStdScale) {
stdNormComponents = new float[numComponents];
for (int c = 0, nc = normOffset; c < numColorComponents;
c++, nc++) {
stdNormComponents[c] = (normComponents[nc] - compOffset[c]) *
compScale[c];
// REMIND: need to analyze whether this
// clamping is necessary
if (stdNormComponents[c] < 0.0f) {
stdNormComponents[c] = 0.0f;
}
if (stdNormComponents[c] > 1.0f) {
stdNormComponents[c] = 1.0f;
}
}
if (supportsAlpha) {
stdNormComponents[numColorComponents] =
normComponents[numColorComponents + normOffset];
}
normOffset = 0;
} else {
stdNormComponents = normComponents;
}
switch (transferType) {
case DataBuffer.TYPE_BYTE:
byte[] bpixel;
if (obj == null) {
bpixel = new byte[numComponents];
} else {
bpixel = (byte[]) obj;
}
if (needAlpha) {
float alpha =
stdNormComponents[numColorComponents + normOffset];
for (int c = 0, nc = normOffset; c < numColorComponents;
c++, nc++) {
bpixel[c] = (byte) ((stdNormComponents[nc] * alpha) *
((float) ((1 << nBits[c]) - 1)) + 0.5f);
}
bpixel[numColorComponents] =
(byte) (alpha *
((float) ((1 << nBits[numColorComponents]) - 1)) +
0.5f);
} else {
for (int c = 0, nc = normOffset; c < numComponents;
c++, nc++) {
bpixel[c] = (byte) (stdNormComponents[nc] *
((float) ((1 << nBits[c]) - 1)) + 0.5f);
}
}
return bpixel;
case DataBuffer.TYPE_USHORT:
short[] uspixel;
if (obj == null) {
uspixel = new short[numComponents];
} else {
uspixel = (short[]) obj;
}
if (needAlpha) {
float alpha =
stdNormComponents[numColorComponents + normOffset];
for (int c = 0, nc = normOffset; c < numColorComponents;
c++, nc++) {
uspixel[c] = (short) ((stdNormComponents[nc] * alpha) *
((float) ((1 << nBits[c]) - 1)) +
0.5f);
}
uspixel[numColorComponents] =
(short) (alpha *
((float) ((1 << nBits[numColorComponents]) - 1)) +
0.5f);
} else {
for (int c = 0, nc = normOffset; c < numComponents;
c++, nc++) {
uspixel[c] = (short) (stdNormComponents[nc] *
((float) ((1 << nBits[c]) - 1)) +
0.5f);
}
}
return uspixel;
case DataBuffer.TYPE_INT:
int[] ipixel;
if (obj == null) {
ipixel = new int[numComponents];
} else {
ipixel = (int[]) obj;
}
if (needAlpha) {
float alpha =
stdNormComponents[numColorComponents + normOffset];
for (int c = 0, nc = normOffset; c < numColorComponents;
c++, nc++) {
ipixel[c] = (int) ((stdNormComponents[nc] * alpha) *
((float) ((1 << nBits[c]) - 1)) + 0.5f);
}
ipixel[numColorComponents] =
(int) (alpha *
((float) ((1 << nBits[numColorComponents]) - 1)) +
0.5f);
} else {
for (int c = 0, nc = normOffset; c < numComponents;
c++, nc++) {
ipixel[c] = (int) (stdNormComponents[nc] *
((float) ((1 << nBits[c]) - 1)) + 0.5f);
}
}
return ipixel;
case DataBuffer.TYPE_SHORT:
short[] spixel;
if (obj == null) {
spixel = new short[numComponents];
} else {
spixel = (short[]) obj;
}
if (needAlpha) {
float alpha =
stdNormComponents[numColorComponents + normOffset];
for (int c = 0, nc = normOffset; c < numColorComponents;
c++, nc++) {
spixel[c] = (short)
(stdNormComponents[nc] * alpha * 32767.0f + 0.5f);
}
spixel[numColorComponents] = (short) (alpha * 32767.0f + 0.5f);
} else {
for (int c = 0, nc = normOffset; c < numComponents;
c++, nc++) {
spixel[c] = (short)
(stdNormComponents[nc] * 32767.0f + 0.5f);
}
}
return spixel;
case DataBuffer.TYPE_FLOAT:
float[] fpixel;
if (obj == null) {
fpixel = new float[numComponents];
} else {
fpixel = (float[]) obj;
}
if (needAlpha) {
float alpha = normComponents[numColorComponents + normOffset];
for (int c = 0, nc = normOffset; c < numColorComponents;
c++, nc++) {
fpixel[c] = normComponents[nc] * alpha;
}
fpixel[numColorComponents] = alpha;
} else {
for (int c = 0, nc = normOffset; c < numComponents;
c++, nc++) {
fpixel[c] = normComponents[nc];
}
}
return fpixel;
case DataBuffer.TYPE_DOUBLE:
double[] dpixel;
if (obj == null) {
dpixel = new double[numComponents];
} else {
dpixel = (double[]) obj;
}
if (needAlpha) {
double alpha =
(double) (normComponents[numColorComponents + normOffset]);
for (int c = 0, nc = normOffset; c < numColorComponents;
c++, nc++) {
dpixel[c] = normComponents[nc] * alpha;
}
dpixel[numColorComponents] = alpha;
} else {
for (int c = 0, nc = normOffset; c < numComponents;
c++, nc++) {
dpixel[c] = (double) normComponents[nc];
}
}
return dpixel;
default:
throw new UnsupportedOperationException("This method has not been "+
"implemented for transferType " +
transferType);
}
}
/**
* Returns an array of all of the color/alpha components in normalized
* form, given a pixel in this <code>ColorModel</code>. The pixel
* value is specified by an array of data elements of type transferType
* passed in as an object reference. If pixel is not a primitive array
* of type transferType, a <code>ClassCastException</code> is thrown.
* An <code>ArrayIndexOutOfBoundsException</code> is thrown if
* <code>pixel</code> is not large enough to hold a pixel value for this
* <code>ColorModel</code>.
* Normalized components are float values between a per component minimum
* and maximum specified by the <code>ColorSpace</code> object for this
* <code>ColorModel</code>. If the
* <code>normComponents</code> array is <code>null</code>, a new array
* will be allocated. The <code>normComponents</code> array
* will be returned. Color/alpha components are stored in the
* <code>normComponents</code> array starting at
* <code>normOffset</code> (even if the array is allocated by this
* method). An <code>ArrayIndexOutOfBoundsException</code> is thrown
* if the <code>normComponents</code> array is not <code>null</code>
* and is not large enough to hold all the color and alpha components
* (starting at <code>normOffset</code>).
* <p>
* This method must be overrridden by a subclass if that subclass
* is designed to translate pixel sample values to color component values
* in a non-default way. The default translations implemented by this
* class is described in the class comments. Any subclass implementing
* a non-default translation must follow the constraints on allowable
* translations defined there.
* @param pixel the specified pixel
* @param normComponents an array to receive the normalized components
* @param normOffset the offset into the <code>normComponents</code>
* array at which to start storing normalized components
* @return an array containing normalized color and alpha
* components.
* @throws ClassCastException if <code>pixel</code> is not a primitive
* array of type transferType
* @throws ArrayIndexOutOfBoundsException if
* <code>normComponents</code> is not large enough to hold all
* color and alpha components starting at <code>normOffset</code>
* @throws ArrayIndexOutOfBoundsException if
* <code>pixel</code> is not large enough to hold a pixel
* value for this <code>ColorModel</code>.
* @since 1.4
*/
public float[] getNormalizedComponents(Object pixel,
float[] normComponents,
int normOffset) {
if (normComponents == null) {
normComponents = new float[numComponents+normOffset];
}
switch (transferType) {
case DataBuffer.TYPE_BYTE:
byte[] bpixel = (byte[]) pixel;
for (int c = 0, nc = normOffset; c < numComponents; c++, nc++) {
normComponents[nc] = ((float) (bpixel[c] & 0xff)) /
((float) ((1 << nBits[c]) - 1));
}
break;
case DataBuffer.TYPE_USHORT:
short[] uspixel = (short[]) pixel;
for (int c = 0, nc = normOffset; c < numComponents; c++, nc++) {
normComponents[nc] = ((float) (uspixel[c] & 0xffff)) /
((float) ((1 << nBits[c]) - 1));
}
break;
case DataBuffer.TYPE_INT:
int[] ipixel = (int[]) pixel;
for (int c = 0, nc = normOffset; c < numComponents; c++, nc++) {
normComponents[nc] = ((float) ipixel[c]) /
((float) ((1 << nBits[c]) - 1));
}
break;
case DataBuffer.TYPE_SHORT:
short[] spixel = (short[]) pixel;
for (int c = 0, nc = normOffset; c < numComponents; c++, nc++) {
normComponents[nc] = ((float) spixel[c]) / 32767.0f;
}
break;
case DataBuffer.TYPE_FLOAT:
float[] fpixel = (float[]) pixel;
for (int c = 0, nc = normOffset; c < numComponents; c++, nc++) {
normComponents[nc] = fpixel[c];
}
break;
case DataBuffer.TYPE_DOUBLE:
double[] dpixel = (double[]) pixel;
for (int c = 0, nc = normOffset; c < numComponents; c++, nc++) {
normComponents[nc] = (float) dpixel[c];
}
break;
default:
throw new UnsupportedOperationException("This method has not been "+
"implemented for transferType " +
transferType);
}
if (supportsAlpha && isAlphaPremultiplied) {
float alpha = normComponents[numColorComponents + normOffset];
if (alpha != 0.0f) {
float invAlpha = 1.0f / alpha;
for (int c = normOffset; c < numColorComponents + normOffset;
c++) {
normComponents[c] *= invAlpha;
}
}
}
if (min != null) {
// Normally (i.e. when this class is not subclassed to override
// this method), the test (min != null) will be equivalent to
// the test (nonStdScale). However, there is an unlikely, but
// possible case, in which this method is overridden, nonStdScale
// is set true by initScale(), the subclass method for some
// reason calls this superclass method, but the min and
// diffMinMax arrays were never initialized by setupLUTs(). In
// that case, the right thing to do is follow the intended
// semantics of this method, and rescale the color components
// only if the ColorSpace min/max were detected to be other
// than 0.0/1.0 by setupLUTs(). Note that this implies the
// transferType is byte, ushort, int, or short - i.e. components
// derived from float and double pixel data are never rescaled.
for (int c = 0; c < numColorComponents; c++) {
normComponents[c + normOffset] = min[c] +
diffMinMax[c] * normComponents[c + normOffset];
}
}
return normComponents;
}
/**
* Forces the raster data to match the state specified in the
* <CODE>isAlphaPremultiplied</CODE> variable, assuming the data
* is currently correctly described by this <CODE>ColorModel</CODE>.
* It may multiply or divide the color raster data by alpha, or
* do nothing if the data is in the correct state. If the data needs
* to be coerced, this method also returns an instance of
* this <CODE>ColorModel</CODE> with
* the <CODE>isAlphaPremultiplied</CODE> flag set appropriately.
* Since <code>ColorModel</code> can be subclassed, subclasses inherit
* the implementation of this method and if they don't override it
* then they throw an exception if they use an unsupported
* <code>transferType</code>.
*
* @throws NullPointerException if <code>raster</code> is
* <code>null</code> and data coercion is required.
* @throws UnsupportedOperationException if the transfer type of
* this <CODE>ComponentColorModel</CODE>
* is not one of the supported transfer types:
* <CODE>DataBuffer.TYPE_BYTE</CODE>, <CODE>DataBuffer.TYPE_USHORT</CODE>,
* <CODE>DataBuffer.TYPE_INT</CODE>, <CODE>DataBuffer.TYPE_SHORT</CODE>,
* <CODE>DataBuffer.TYPE_FLOAT</CODE>, or <CODE>DataBuffer.TYPE_DOUBLE</CODE>.
*/
public ColorModel coerceData (WritableRaster raster,
boolean isAlphaPremultiplied) {
if ((supportsAlpha == false) ||
(this.isAlphaPremultiplied == isAlphaPremultiplied))
{
// Nothing to do
return this;
}
int w = raster.getWidth();
int h = raster.getHeight();
int aIdx = raster.getNumBands() - 1;
float normAlpha;
int rminX = raster.getMinX();
int rY = raster.getMinY();
int rX;
if (isAlphaPremultiplied) {
switch (transferType) {
case DataBuffer.TYPE_BYTE: {
byte pixel[] = null;
byte zpixel[] = null;
float alphaScale = 1.0f / ((float) ((1<<nBits[aIdx]) - 1));
for (int y = 0; y < h; y++, rY++) {
rX = rminX;
for (int x = 0; x < w; x++, rX++) {
pixel = (byte[])raster.getDataElements(rX, rY,
pixel);
normAlpha = (pixel[aIdx] & 0xff) * alphaScale;
if (normAlpha != 0.0f) {
for (int c=0; c < aIdx; c++) {
pixel[c] = (byte)((pixel[c] & 0xff) *
normAlpha + 0.5f);
}
raster.setDataElements(rX, rY, pixel);
} else {
if (zpixel == null) {
zpixel = new byte[numComponents];
java.util.Arrays.fill(zpixel, (byte) 0);
}
raster.setDataElements(rX, rY, zpixel);
}
}
}
}
break;
case DataBuffer.TYPE_USHORT: {
short pixel[] = null;
short zpixel[] = null;
float alphaScale = 1.0f / ((float) ((1<<nBits[aIdx]) - 1));
for (int y = 0; y < h; y++, rY++) {
rX = rminX;
for (int x = 0; x < w; x++, rX++) {
pixel = (short[])raster.getDataElements(rX, rY,
pixel);
normAlpha = (pixel[aIdx] & 0xffff) * alphaScale;
if (normAlpha != 0.0f) {
for (int c=0; c < aIdx; c++) {
pixel[c] = (short)
((pixel[c] & 0xffff) * normAlpha +
0.5f);
}
raster.setDataElements(rX, rY, pixel);
} else {
if (zpixel == null) {
zpixel = new short[numComponents];
java.util.Arrays.fill(zpixel, (short) 0);
}
raster.setDataElements(rX, rY, zpixel);
}
}
}
}
break;
case DataBuffer.TYPE_INT: {
int pixel[] = null;
int zpixel[] = null;
float alphaScale = 1.0f / ((float) ((1<<nBits[aIdx]) - 1));
for (int y = 0; y < h; y++, rY++) {
rX = rminX;
for (int x = 0; x < w; x++, rX++) {
pixel = (int[])raster.getDataElements(rX, rY,
pixel);
normAlpha = pixel[aIdx] * alphaScale;
if (normAlpha != 0.0f) {
for (int c=0; c < aIdx; c++) {
pixel[c] = (int) (pixel[c] * normAlpha +
0.5f);
}
raster.setDataElements(rX, rY, pixel);
} else {
if (zpixel == null) {
zpixel = new int[numComponents];
java.util.Arrays.fill(zpixel, 0);
}
raster.setDataElements(rX, rY, zpixel);
}
}
}
}
break;
case DataBuffer.TYPE_SHORT: {
short pixel[] = null;
short zpixel[] = null;
float alphaScale = 1.0f / 32767.0f;
for (int y = 0; y < h; y++, rY++) {
rX = rminX;
for (int x = 0; x < w; x++, rX++) {
pixel = (short[]) raster.getDataElements(rX, rY,
pixel);
normAlpha = pixel[aIdx] * alphaScale;
if (normAlpha != 0.0f) {
for (int c=0; c < aIdx; c++) {
pixel[c] = (short) (pixel[c] * normAlpha +
0.5f);
}
raster.setDataElements(rX, rY, pixel);
} else {
if (zpixel == null) {
zpixel = new short[numComponents];
java.util.Arrays.fill(zpixel, (short) 0);
}
raster.setDataElements(rX, rY, zpixel);
}
}
}
}
break;
case DataBuffer.TYPE_FLOAT: {
float pixel[] = null;
float zpixel[] = null;
for (int y = 0; y < h; y++, rY++) {
rX = rminX;
for (int x = 0; x < w; x++, rX++) {
pixel = (float[]) raster.getDataElements(rX, rY,
pixel);
normAlpha = pixel[aIdx];
if (normAlpha != 0.0f) {
for (int c=0; c < aIdx; c++) {
pixel[c] *= normAlpha;
}
raster.setDataElements(rX, rY, pixel);
} else {
if (zpixel == null) {
zpixel = new float[numComponents];
java.util.Arrays.fill(zpixel, 0.0f);
}
raster.setDataElements(rX, rY, zpixel);
}
}
}
}
break;
case DataBuffer.TYPE_DOUBLE: {
double pixel[] = null;
double zpixel[] = null;
for (int y = 0; y < h; y++, rY++) {
rX = rminX;
for (int x = 0; x < w; x++, rX++) {
pixel = (double[]) raster.getDataElements(rX, rY,
pixel);
double dnormAlpha = pixel[aIdx];
if (dnormAlpha != 0.0) {
for (int c=0; c < aIdx; c++) {
pixel[c] *= dnormAlpha;
}
raster.setDataElements(rX, rY, pixel);
} else {
if (zpixel == null) {
zpixel = new double[numComponents];
java.util.Arrays.fill(zpixel, 0.0);
}
raster.setDataElements(rX, rY, zpixel);
}
}
}
}
break;
default:
throw new UnsupportedOperationException("This method has not been "+
"implemented for transferType " + transferType);
}
}
else {
// We are premultiplied and want to divide it out
switch (transferType) {
case DataBuffer.TYPE_BYTE: {
byte pixel[] = null;
float alphaScale = 1.0f / ((float) ((1<<nBits[aIdx]) - 1));
for (int y = 0; y < h; y++, rY++) {
rX = rminX;
for (int x = 0; x < w; x++, rX++) {
pixel = (byte[])raster.getDataElements(rX, rY,
pixel);
normAlpha = (pixel[aIdx] & 0xff) * alphaScale;
if (normAlpha != 0.0f) {
float invAlpha = 1.0f / normAlpha;
for (int c=0; c < aIdx; c++) {
pixel[c] = (byte)
((pixel[c] & 0xff) * invAlpha + 0.5f);
}
raster.setDataElements(rX, rY, pixel);
}
}
}
}
break;
case DataBuffer.TYPE_USHORT: {
short pixel[] = null;
float alphaScale = 1.0f / ((float) ((1<<nBits[aIdx]) - 1));
for (int y = 0; y < h; y++, rY++) {
rX = rminX;
for (int x = 0; x < w; x++, rX++) {
pixel = (short[])raster.getDataElements(rX, rY,
pixel);
normAlpha = (pixel[aIdx] & 0xffff) * alphaScale;
if (normAlpha != 0.0f) {
float invAlpha = 1.0f / normAlpha;
for (int c=0; c < aIdx; c++) {
pixel[c] = (short)
((pixel[c] & 0xffff) * invAlpha + 0.5f);
}
raster.setDataElements(rX, rY, pixel);
}
}
}
}
break;
case DataBuffer.TYPE_INT: {
int pixel[] = null;
float alphaScale = 1.0f / ((float) ((1<<nBits[aIdx]) - 1));
for (int y = 0; y < h; y++, rY++) {
rX = rminX;
for (int x = 0; x < w; x++, rX++) {
pixel = (int[])raster.getDataElements(rX, rY,
pixel);
normAlpha = pixel[aIdx] * alphaScale;
if (normAlpha != 0.0f) {
float invAlpha = 1.0f / normAlpha;
for (int c=0; c < aIdx; c++) {
pixel[c] = (int)
(pixel[c] * invAlpha + 0.5f);
}
raster.setDataElements(rX, rY, pixel);
}
}
}
}
break;
case DataBuffer.TYPE_SHORT: {
short pixel[] = null;
float alphaScale = 1.0f / 32767.0f;
for (int y = 0; y < h; y++, rY++) {
rX = rminX;
for (int x = 0; x < w; x++, rX++) {
pixel = (short[])raster.getDataElements(rX, rY,
pixel);
normAlpha = pixel[aIdx] * alphaScale;
if (normAlpha != 0.0f) {
float invAlpha = 1.0f / normAlpha;
for (int c=0; c < aIdx; c++) {
pixel[c] = (short)
(pixel[c] * invAlpha + 0.5f);
}
raster.setDataElements(rX, rY, pixel);
}
}
}
}
break;
case DataBuffer.TYPE_FLOAT: {
float pixel[] = null;
for (int y = 0; y < h; y++, rY++) {
rX = rminX;
for (int x = 0; x < w; x++, rX++) {
pixel = (float[])raster.getDataElements(rX, rY,
pixel);
normAlpha = pixel[aIdx];
if (normAlpha != 0.0f) {
float invAlpha = 1.0f / normAlpha;
for (int c=0; c < aIdx; c++) {
pixel[c] *= invAlpha;
}
raster.setDataElements(rX, rY, pixel);
}
}
}
}
break;
case DataBuffer.TYPE_DOUBLE: {
double pixel[] = null;
for (int y = 0; y < h; y++, rY++) {
rX = rminX;
for (int x = 0; x < w; x++, rX++) {
pixel = (double[])raster.getDataElements(rX, rY,
pixel);
double dnormAlpha = pixel[aIdx];
if (dnormAlpha != 0.0) {
double invAlpha = 1.0 / dnormAlpha;
for (int c=0; c < aIdx; c++) {
pixel[c] *= invAlpha;
}
raster.setDataElements(rX, rY, pixel);
}
}
}
}
break;
default:
throw new UnsupportedOperationException("This method has not been "+
"implemented for transferType " + transferType);
}
}
// Return a new color model
if (!signed) {
return new ComponentColorModel(colorSpace, nBits, supportsAlpha,
isAlphaPremultiplied, transparency,
transferType);
} else {
return new ComponentColorModel(colorSpace, supportsAlpha,
isAlphaPremultiplied, transparency,
transferType);
}
}
/**
* Returns true if <CODE>raster</CODE> is compatible with this
* <CODE>ColorModel</CODE>; false if it is not.
*
* @param raster The <CODE>Raster</CODE> object to test for compatibility.
*
* @return <CODE>true</CODE> if <CODE>raster</CODE> is compatible with this
* <CODE>ColorModel</CODE>, <CODE>false</CODE> if it is not.
*/
public boolean isCompatibleRaster(Raster raster) {
SampleModel sm = raster.getSampleModel();
if (sm instanceof ComponentSampleModel) {
if (sm.getNumBands() != getNumComponents()) {
return false;
}
for (int i=0; i<nBits.length; i++) {
if (sm.getSampleSize(i) < nBits[i]) {
return false;
}
}
return (raster.getTransferType() == transferType);
}
else {
return false;
}
}
/**
* Creates a <CODE>WritableRaster</CODE> with the specified width and height,
* that has a data layout (<CODE>SampleModel</CODE>) compatible with
* this <CODE>ColorModel</CODE>.
*
* @param w The width of the <CODE>WritableRaster</CODE> you want to create.
* @param h The height of the <CODE>WritableRaster</CODE> you want to create.
*
* @return A <CODE>WritableRaster</CODE> that is compatible with
* this <CODE>ColorModel</CODE>.
* @see WritableRaster
* @see SampleModel
*/
public WritableRaster createCompatibleWritableRaster (int w, int h) {
int dataSize = w*h*numComponents;
WritableRaster raster = null;
switch (transferType) {
case DataBuffer.TYPE_BYTE:
case DataBuffer.TYPE_USHORT:
raster = Raster.createInterleavedRaster(transferType,
w, h,
numComponents, null);
break;
default:
SampleModel sm = createCompatibleSampleModel(w, h);
DataBuffer db = sm.createDataBuffer();
raster = Raster.createWritableRaster(sm, db, null);
}
return raster;
}
/**
* Creates a <CODE>SampleModel</CODE> with the specified width and height,
* that has a data layout compatible with this <CODE>ColorModel</CODE>.
*
* @param w The width of the <CODE>SampleModel</CODE> you want to create.
* @param h The height of the <CODE>SampleModel</CODE> you want to create.
*
* @return A <CODE>SampleModel</CODE> that is compatible with this
* <CODE>ColorModel</CODE>.
*
* @see SampleModel
*/
public SampleModel createCompatibleSampleModel(int w, int h) {
int[] bandOffsets = new int[numComponents];
for (int i=0; i < numComponents; i++) {
bandOffsets[i] = i;
}
switch (transferType) {
case DataBuffer.TYPE_BYTE:
case DataBuffer.TYPE_USHORT:
return new PixelInterleavedSampleModel(transferType, w, h,
numComponents,
w*numComponents,
bandOffsets);
default:
return new ComponentSampleModel(transferType, w, h,
numComponents,
w*numComponents,
bandOffsets);
}
}
/**
* Checks whether or not the specified <CODE>SampleModel</CODE>
* is compatible with this <CODE>ColorModel</CODE>.
*
* @param sm The <CODE>SampleModel</CODE> to test for compatibility.
*
* @return <CODE>true</CODE> if the <CODE>SampleModel</CODE> is
* compatible with this <CODE>ColorModel</CODE>, <CODE>false</CODE>
* if it is not.
*
* @see SampleModel
*/
public boolean isCompatibleSampleModel(SampleModel sm) {
if (!(sm instanceof ComponentSampleModel)) {
return false;
}
// Must have the same number of components
if (numComponents != sm.getNumBands()) {
return false;
}
if (sm.getTransferType() != transferType) {
return false;
}
return true;
}
/**
* Returns a <CODE>Raster</CODE> representing the alpha channel of an image,
* extracted from the input <CODE>Raster</CODE>.
* This method assumes that <CODE>Raster</CODE> objects associated with
* this <CODE>ColorModel</CODE> store the alpha band, if present, as
* the last band of image data. Returns null if there is no separate spatial
* alpha channel associated with this <CODE>ColorModel</CODE>.
* This method creates a new <CODE>Raster</CODE>, but will share the data
* array.
*
* @param raster The <CODE>WritableRaster</CODE> from which to extract the
* alpha channel.
*
* @return A <CODE>WritableRaster</CODE> containing the image's alpha channel.
*
*/
public WritableRaster getAlphaRaster(WritableRaster raster) {
if (hasAlpha() == false) {
return null;
}
int x = raster.getMinX();
int y = raster.getMinY();
int[] band = new int[1];
band[0] = raster.getNumBands() - 1;
return raster.createWritableChild(x, y, raster.getWidth(),
raster.getHeight(), x, y,
band);
}
/**
* Compares this color model with another for equality.
*
* @param obj The object to compare with this color model.
* @return <CODE>true</CODE> if the color model objects are equal,
* <CODE>false</CODE> if they are not.
*/
public boolean equals(Object obj) {
if (!super.equals(obj)) {
return false;
}
if (obj.getClass() != getClass()) {
return false;
}
return true;
}
}