/* * Copyright (c) 1995, 2018, 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.Transparency; /** * The {@code DirectColorModel} class is a {@code ColorModel} * class that works with pixel values that represent RGB * color and alpha information as separate samples and that pack all * samples for a single pixel into a single int, short, or byte quantity. * This class can be used only with ColorSpaces of type ColorSpace.TYPE_RGB. * In addition, for each component of the ColorSpace, the minimum * normalized component value obtained via the {@code getMinValue()} * method of ColorSpace must be 0.0, and the maximum value obtained via * the {@code getMaxValue()} method must be 1.0 (these min/max * values are typical for RGB spaces). * There must be three color samples in the pixel values and there can * be a single alpha sample. For those methods that use a primitive array * pixel representation of type {@code transferType}, the array * length is always one. The transfer * types supported are DataBuffer.TYPE_BYTE, * DataBuffer.TYPE_USHORT, and DataBuffer.TYPE_INT. * Color and alpha samples are stored in the single * element of the array in bits indicated by bit masks. Each bit mask * must be contiguous and masks must not overlap. The same masks apply to * the single int pixel representation used by other methods. The * correspondence of masks and color/alpha samples is as follows: *
* The translation from pixel values to color/alpha components for * display or processing purposes is a one-to-one correspondence of * samples to components. A {@code DirectColorModel} is * typically used with image data which uses masks to define packed * samples. For example, a {@code DirectColorModel} can be used in * conjunction with a {@code SinglePixelPackedSampleModel} to * construct a {@link BufferedImage}. Normally the masks used by the * {@link SampleModel} and the {@code ColorModel} would be the * same. However, if they are different, the color interpretation * of pixel data will be done according to the masks of the * {@code ColorModel}. *
* A single int pixel representation is valid for all objects of this * class, since it is always possible to represent pixel values used with * this class in a single int. Therefore, methods which use this * representation will not throw an {@code IllegalArgumentException} * due to an invalid pixel value. *
* This color model is similar to an X11 TrueColor visual. * The default RGB ColorModel specified by the * {@link ColorModel#getRGBdefault() getRGBdefault} method is a * {@code DirectColorModel} with the following parameters: *
* Number of bits: 32 * Red mask: 0x00ff0000 * Green mask: 0x0000ff00 * Blue mask: 0x000000ff * Alpha mask: 0xff000000 * Color space: sRGB * isAlphaPremultiplied: False * Transparency: Transparency.TRANSLUCENT * transferType: DataBuffer.TYPE_INT **
* Many of the methods in this class are final. This is because the
* underlying native graphics code makes assumptions about the layout
* and operation of this class and those assumptions are reflected in
* the implementations of the methods here that are marked final. You
* can subclass this class for other reasons, but you cannot override
* or modify the behavior of those methods.
*
* @see ColorModel
* @see ColorSpace
* @see SinglePixelPackedSampleModel
* @see BufferedImage
* @see ColorModel#getRGBdefault
*
*/
public class DirectColorModel extends PackedColorModel {
private int red_mask;
private int green_mask;
private int blue_mask;
private int alpha_mask;
private int red_offset;
private int green_offset;
private int blue_offset;
private int alpha_offset;
private int red_scale;
private int green_scale;
private int blue_scale;
private int alpha_scale;
private boolean is_LinearRGB;
private int lRGBprecision;
private byte[] tosRGB8LUT;
private byte[] fromsRGB8LUT8;
private short[] fromsRGB8LUT16;
/**
* Constructs a {@code DirectColorModel} from the specified masks
* that indicate which bits in an {@code int} pixel representation
* contain the red, green and blue color samples. As pixel values do not
* contain alpha information, all pixels are treated as opaque, which
* means that alpha = 1.0. All of the bits
* in each mask must be contiguous and fit in the specified number
* of least significant bits of an {@code int} pixel representation.
* The {@code ColorSpace} is the default sRGB space. The
* transparency value is Transparency.OPAQUE. The transfer type
* is the smallest of DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT,
* or DataBuffer.TYPE_INT that can hold a single pixel.
* @param bits the number of bits in the pixel values; for example,
* the sum of the number of bits in the masks.
* @param rmask specifies a mask indicating which bits in an
* integer pixel contain the red component
* @param gmask specifies a mask indicating which bits in an
* integer pixel contain the green component
* @param bmask specifies a mask indicating which bits in an
* integer pixel contain the blue component
*
*/
public DirectColorModel(int bits,
int rmask, int gmask, int bmask) {
this(bits, rmask, gmask, bmask, 0);
}
/**
* Constructs a {@code DirectColorModel} from the specified masks
* that indicate which bits in an {@code int} pixel representation
* contain the red, green and blue color samples and the alpha sample,
* if present. If {@code amask} is 0, pixel values do not contain
* alpha information and all pixels are treated as opaque, which means
* that alpha = 1.0. All of the bits in each mask must
* be contiguous and fit in the specified number of least significant bits
* of an {@code int} pixel representation. Alpha, if present, is not
* premultiplied. The {@code ColorSpace} is the default sRGB space.
* The transparency value is Transparency.OPAQUE if no alpha is
* present, or Transparency.TRANSLUCENT otherwise. The transfer type
* is the smallest of DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT,
* or DataBuffer.TYPE_INT that can hold a single pixel.
* @param bits the number of bits in the pixel values; for example,
* the sum of the number of bits in the masks.
* @param rmask specifies a mask indicating which bits in an
* integer pixel contain the red component
* @param gmask specifies a mask indicating which bits in an
* integer pixel contain the green component
* @param bmask specifies a mask indicating which bits in an
* integer pixel contain the blue component
* @param amask specifies a mask indicating which bits in an
* integer pixel contain the alpha component
*/
public DirectColorModel(int bits, int rmask, int gmask,
int bmask, int amask) {
super (ColorSpace.getInstance(ColorSpace.CS_sRGB),
bits, rmask, gmask, bmask, amask, false,
amask == 0 ? Transparency.OPAQUE : Transparency.TRANSLUCENT,
ColorModel.getDefaultTransferType(bits));
setFields();
}
/**
* Constructs a {@code DirectColorModel} from the specified
* parameters. Color components are in the specified
* {@code ColorSpace}, which must be of type ColorSpace.TYPE_RGB
* and have minimum normalized component values which are all 0.0
* and maximum values which are all 1.0.
* The masks specify which bits in an {@code int} pixel
* representation contain the red, green and blue color samples and
* the alpha sample, if present. If {@code amask} is 0, pixel
* values do not contain alpha information and all pixels are treated
* as opaque, which means that alpha = 1.0. All of the
* bits in each mask must be contiguous and fit in the specified number
* of least significant bits of an {@code int} pixel
* representation. If there is alpha, the {@code boolean}
* {@code isAlphaPremultiplied} specifies how to interpret
* color and alpha samples in pixel values. If the {@code boolean}
* is {@code true}, color samples are assumed to have been
* multiplied by the alpha sample. The transparency value is
* Transparency.OPAQUE, if no alpha is present, or
* Transparency.TRANSLUCENT otherwise. The transfer type
* is the type of primitive array used to represent pixel values and
* must be one of DataBuffer.TYPE_BYTE, DataBuffer.TYPE_USHORT, or
* DataBuffer.TYPE_INT.
* @param space the specified {@code ColorSpace}
* @param bits the number of bits in the pixel values; for example,
* the sum of the number of bits in the masks.
* @param rmask specifies a mask indicating which bits in an
* integer pixel contain the red component
* @param gmask specifies a mask indicating which bits in an
* integer pixel contain the green component
* @param bmask specifies a mask indicating which bits in an
* integer pixel contain the blue component
* @param amask specifies a mask indicating which bits in an
* integer pixel contain the alpha component
* @param isAlphaPremultiplied {@code true} if color samples are
* premultiplied by the alpha sample; {@code false} otherwise
* @param transferType the type of array used to represent pixel values
* @throws IllegalArgumentException if {@code space} is not a
* TYPE_RGB space or if the min/max normalized component
* values are not 0.0/1.0.
*/
public DirectColorModel(ColorSpace space, int bits, int rmask,
int gmask, int bmask, int amask,
boolean isAlphaPremultiplied,
int transferType) {
super (space, bits, rmask, gmask, bmask, amask,
isAlphaPremultiplied,
amask == 0 ? Transparency.OPAQUE : Transparency.TRANSLUCENT,
transferType);
if (ColorModel.isLinearRGBspace(colorSpace)) {
is_LinearRGB = true;
if (maxBits <= 8) {
lRGBprecision = 8;
tosRGB8LUT = ColorModel.getLinearRGB8TosRGB8LUT();
fromsRGB8LUT8 = ColorModel.getsRGB8ToLinearRGB8LUT();
} else {
lRGBprecision = 16;
tosRGB8LUT = ColorModel.getLinearRGB16TosRGB8LUT();
fromsRGB8LUT16 = ColorModel.getsRGB8ToLinearRGB16LUT();
}
} else if (!is_sRGB) {
for (int i = 0; i < 3; i++) {
// super constructor checks that space is TYPE_RGB
// check here that min/max are all 0.0/1.0
if ((space.getMinValue(i) != 0.0f) ||
(space.getMaxValue(i) != 1.0f)) {
throw new IllegalArgumentException(
"Illegal min/max RGB component value");
}
}
}
setFields();
}
/**
* Returns the mask indicating which bits in an {@code int} pixel
* representation contain the red color component.
* @return the mask, which indicates which bits of the {@code int}
* pixel representation contain the red color sample.
*/
public final int getRedMask() {
return maskArray[0];
}
/**
* Returns the mask indicating which bits in an {@code int} pixel
* representation contain the green color component.
* @return the mask, which indicates which bits of the {@code int}
* pixel representation contain the green color sample.
*/
public final int getGreenMask() {
return maskArray[1];
}
/**
* Returns the mask indicating which bits in an {@code int} pixel
* representation contain the blue color component.
* @return the mask, which indicates which bits of the {@code int}
* pixel representation contain the blue color sample.
*/
public final int getBlueMask() {
return maskArray[2];
}
/**
* Returns the mask indicating which bits in an {@code int} pixel
* representation contain the alpha component.
* @return the mask, which indicates which bits of the {@code int}
* pixel representation contain the alpha sample.
*/
public final int getAlphaMask() {
if (supportsAlpha) {
return maskArray[3];
} else {
return 0;
}
}
/*
* Given an int pixel in this ColorModel's ColorSpace, converts
* it to the default sRGB ColorSpace and returns the R, G, and B
* components as float values between 0.0 and 1.0.
*/
private float[] getDefaultRGBComponents(int pixel) {
int[] components = getComponents(pixel, null, 0);
float[] norm = getNormalizedComponents(components, 0, null, 0);
// Note that getNormalizedComponents returns non-premultiplied values
return colorSpace.toRGB(norm);
}
private int getsRGBComponentFromsRGB(int pixel, int idx) {
int c = ((pixel & maskArray[idx]) >>> maskOffsets[idx]);
if (isAlphaPremultiplied) {
int a = ((pixel & maskArray[3]) >>> maskOffsets[3]);
c = (a == 0) ? 0 :
(int) (((c * scaleFactors[idx]) * 255.0f /
(a * scaleFactors[3])) + 0.5f);
} else if (scaleFactors[idx] != 1.0f) {
c = (int) ((c * scaleFactors[idx]) + 0.5f);
}
return c;
}
private int getsRGBComponentFromLinearRGB(int pixel, int idx) {
int c = ((pixel & maskArray[idx]) >>> maskOffsets[idx]);
if (isAlphaPremultiplied) {
float factor = (float) ((1 << lRGBprecision) - 1);
int a = ((pixel & maskArray[3]) >>> maskOffsets[3]);
c = (a == 0) ? 0 :
(int) (((c * scaleFactors[idx]) * factor /
(a * scaleFactors[3])) + 0.5f);
} else if (nBits[idx] != lRGBprecision) {
if (lRGBprecision == 16) {
c = (int) ((c * scaleFactors[idx] * 257.0f) + 0.5f);
} else {
c = (int) ((c * scaleFactors[idx]) + 0.5f);
}
}
// now range of c is 0-255 or 0-65535, depending on lRGBprecision
return tosRGB8LUT[c] & 0xff;
}
/**
* Returns the red color component for the specified pixel, scaled
* from 0 to 255 in the default RGB {@code ColorSpace}, sRGB. A
* color conversion is done if necessary. The pixel value is specified
* as an {@code int}.
* The returned value is a non pre-multiplied value. Thus, if the
* alpha is premultiplied, this method divides it out before returning
* the value. If the alpha value is 0, for example, the red value
* is 0.
* @param pixel the specified pixel
* @return the red color component for the specified pixel, from
* 0 to 255 in the sRGB {@code ColorSpace}.
*/
public final int getRed(int pixel) {
if (is_sRGB) {
return getsRGBComponentFromsRGB(pixel, 0);
} else if (is_LinearRGB) {
return getsRGBComponentFromLinearRGB(pixel, 0);
}
float[] rgb = getDefaultRGBComponents(pixel);
return (int) (rgb[0] * 255.0f + 0.5f);
}
/**
* Returns the green color component for the specified pixel, scaled
* from 0 to 255 in the default RGB {@code ColorSpace}, sRGB. A
* color conversion is done if necessary. The pixel value is specified
* as an {@code int}.
* The returned value is a non pre-multiplied value. Thus, if the
* alpha is premultiplied, this method divides it out before returning
* the value. If the alpha value is 0, for example, the green value
* is 0.
* @param pixel the specified pixel
* @return the green color component for the specified pixel, from
* 0 to 255 in the sRGB {@code ColorSpace}.
*/
public final int getGreen(int pixel) {
if (is_sRGB) {
return getsRGBComponentFromsRGB(pixel, 1);
} else if (is_LinearRGB) {
return getsRGBComponentFromLinearRGB(pixel, 1);
}
float[] rgb = getDefaultRGBComponents(pixel);
return (int) (rgb[1] * 255.0f + 0.5f);
}
/**
* Returns the blue color component for the specified pixel, scaled
* from 0 to 255 in the default RGB {@code ColorSpace}, sRGB. A
* color conversion is done if necessary. The pixel value is specified
* as an {@code int}.
* The returned value is a non pre-multiplied value. Thus, if the
* alpha is premultiplied, this method divides it out before returning
* the value. If the alpha value is 0, for example, the blue value
* is 0.
* @param pixel the specified pixel
* @return the blue color component for the specified pixel, from
* 0 to 255 in the sRGB {@code ColorSpace}.
*/
public final int getBlue(int pixel) {
if (is_sRGB) {
return getsRGBComponentFromsRGB(pixel, 2);
} else if (is_LinearRGB) {
return getsRGBComponentFromLinearRGB(pixel, 2);
}
float[] rgb = getDefaultRGBComponents(pixel);
return (int) (rgb[2] * 255.0f + 0.5f);
}
/**
* Returns the alpha component for the specified pixel, scaled
* from 0 to 255. The pixel value is specified as an {@code int}.
* @param pixel the specified pixel
* @return the value of the alpha component of {@code pixel}
* from 0 to 255.
*/
public final int getAlpha(int pixel) {
if (!supportsAlpha) return 255;
int a = ((pixel & maskArray[3]) >>> maskOffsets[3]);
if (scaleFactors[3] != 1.0f) {
a = (int)(a * scaleFactors[3] + 0.5f);
}
return a;
}
/**
* Returns the color/alpha components of the pixel in the default
* RGB color model format. A color conversion is done if necessary.
* The pixel value is specified as an {@code int}.
* The returned value is in a non pre-multiplied format. Thus, if
* the alpha is premultiplied, this method divides it out of the
* color components. If the alpha value is 0, for example, the color
* values are each 0.
* @param pixel the specified pixel
* @return the RGB value of the color/alpha components of the specified
* pixel.
* @see ColorModel#getRGBdefault
*/
public final int getRGB(int pixel) {
if (is_sRGB || is_LinearRGB) {
return (getAlpha(pixel) << 24)
| (getRed(pixel) << 16)
| (getGreen(pixel) << 8)
| (getBlue(pixel) << 0);
}
float[] rgb = getDefaultRGBComponents(pixel);
return (getAlpha(pixel) << 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 the red color component for the specified pixel, scaled
* from 0 to 255 in the default RGB {@code ColorSpace}, sRGB. A
* color conversion is done if necessary. The pixel value is specified
* by an array of data elements of type {@code transferType} passed
* in as an object reference.
* The returned value is a non pre-multiplied value. Thus, if the
* alpha is premultiplied, this method divides it out before returning
* the value. If the alpha value is 0, for example, the red value
* is 0.
* If {@code inData} is not a primitive array of type
* {@code transferType}, a {@code ClassCastException} is
* thrown. An {@code ArrayIndexOutOfBoundsException} is
* thrown if {@code inData} is not large enough to hold a
* pixel value for this {@code ColorModel}. Since
* {@code DirectColorModel} 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}.
* An {@code UnsupportedOperationException} is thrown if this
* {@code transferType} is not supported by this
* {@code ColorModel}.
* @param inData the array containing the pixel value
* @return the value of the red component of the specified pixel.
* @throws ArrayIndexOutOfBoundsException if {@code inData} is not
* large enough to hold a pixel value for this color model
* @throws ClassCastException if {@code inData} is not a
* primitive array of type {@code transferType}
* @throws UnsupportedOperationException if this {@code transferType}
* is not supported by this color model
*/
public int getRed(Object inData) {
int pixel=0;
switch (transferType) {
case DataBuffer.TYPE_BYTE:
byte[] bdata = (byte[])inData;
pixel = bdata[0] & 0xff;
break;
case DataBuffer.TYPE_USHORT:
short[] sdata = (short[])inData;
pixel = sdata[0] & 0xffff;
break;
case DataBuffer.TYPE_INT:
int[] idata = (int[])inData;
pixel = idata[0];
break;
default:
throw new UnsupportedOperationException("This method has not been "+
"implemented for transferType " + transferType);
}
return getRed(pixel);
}
/**
* Returns the green color component for the specified pixel, scaled
* from 0 to 255 in the default RGB {@code ColorSpace}, sRGB. A
* color conversion is done if necessary. The pixel value is specified
* by an array of data elements of type {@code transferType} passed
* in as an object reference.
* The returned value is a non pre-multiplied value. Thus, if the
* alpha is premultiplied, this method divides it out before returning
* the value. If the alpha value is 0, for example, the green value
* is 0. If {@code inData} is not a primitive array of type
* {@code transferType}, a {@code ClassCastException} is thrown.
* An {@code ArrayIndexOutOfBoundsException} is
* thrown if {@code inData} is not large enough to hold a pixel
* value for this {@code ColorModel}. Since
* {@code DirectColorModel} 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}.
* An {@code UnsupportedOperationException} is
* thrown if this {@code transferType} is not supported by this
* {@code ColorModel}.
* @param inData the array containing the pixel value
* @return the value of the green component of the specified pixel.
* @throws ArrayIndexOutOfBoundsException if {@code inData} is not
* large enough to hold a pixel value for this color model
* @throws ClassCastException if {@code inData} is not a
* primitive array of type {@code transferType}
* @throws UnsupportedOperationException if this {@code transferType}
* is not supported by this color model
*/
public int getGreen(Object inData) {
int pixel=0;
switch (transferType) {
case DataBuffer.TYPE_BYTE:
byte[] bdata = (byte[])inData;
pixel = bdata[0] & 0xff;
break;
case DataBuffer.TYPE_USHORT:
short[] sdata = (short[])inData;
pixel = sdata[0] & 0xffff;
break;
case DataBuffer.TYPE_INT:
int[] idata = (int[])inData;
pixel = idata[0];
break;
default:
throw new UnsupportedOperationException("This method has not been "+
"implemented for transferType " + transferType);
}
return getGreen(pixel);
}
/**
* Returns the blue color component for the specified pixel, scaled
* from 0 to 255 in the default RGB {@code ColorSpace}, sRGB. A
* color conversion is done if necessary. The pixel value is specified
* by an array of data elements of type {@code transferType} passed
* in as an object reference.
* The returned value is a non pre-multiplied value. Thus, if the
* alpha is premultiplied, this method divides it out before returning
* the value. If the alpha value is 0, for example, the blue value
* is 0. If {@code inData} is not a primitive array of type
* {@code transferType}, a {@code ClassCastException} is thrown.
* An {@code ArrayIndexOutOfBoundsException} is
* thrown if {@code inData} is not large enough to hold a pixel
* value for this {@code ColorModel}. Since
* {@code DirectColorModel} 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}.
* An {@code UnsupportedOperationException} is
* thrown if this {@code transferType} is not supported by this
* {@code ColorModel}.
* @param inData the array containing the pixel value
* @return the value of the blue component of the specified pixel.
* @throws ArrayIndexOutOfBoundsException if {@code inData} is not
* large enough to hold a pixel value for this color model
* @throws ClassCastException if {@code inData} is not a
* primitive array of type {@code transferType}
* @throws UnsupportedOperationException if this {@code transferType}
* is not supported by this color model
*/
public int getBlue(Object inData) {
int pixel=0;
switch (transferType) {
case DataBuffer.TYPE_BYTE:
byte[] bdata = (byte[])inData;
pixel = bdata[0] & 0xff;
break;
case DataBuffer.TYPE_USHORT:
short[] sdata = (short[])inData;
pixel = sdata[0] & 0xffff;
break;
case DataBuffer.TYPE_INT:
int[] idata = (int[])inData;
pixel = idata[0];
break;
default:
throw new UnsupportedOperationException("This method has not been "+
"implemented for transferType " + transferType);
}
return getBlue(pixel);
}
/**
* 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} passed in as an object
* reference.
* If {@code inData} is not a primitive array of type
* {@code transferType}, a {@code ClassCastException} is
* thrown. An {@code ArrayIndexOutOfBoundsException} is
* thrown if {@code inData} is not large enough to hold a pixel
* value for this {@code ColorModel}. Since
* {@code DirectColorModel} 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}.
* If this {@code transferType} is not supported, an
* {@code UnsupportedOperationException} is thrown.
* @param inData the specified pixel
* @return the alpha component of the specified pixel, scaled from
* 0 to 255.
* @exception ClassCastException if {@code inData}
* is not a primitive array of type {@code transferType}
* @exception ArrayIndexOutOfBoundsException if
* {@code inData} is not large enough to hold a pixel value
* for this {@code ColorModel}
* @exception UnsupportedOperationException if this
* {@code tranferType} is not supported by this
* {@code ColorModel}
*/
public int getAlpha(Object inData) {
int pixel=0;
switch (transferType) {
case DataBuffer.TYPE_BYTE:
byte[] bdata = (byte[])inData;
pixel = bdata[0] & 0xff;
break;
case DataBuffer.TYPE_USHORT:
short[] sdata = (short[])inData;
pixel = sdata[0] & 0xffff;
break;
case DataBuffer.TYPE_INT:
int[] idata = (int[])inData;
pixel = idata[0];
break;
default:
throw new UnsupportedOperationException("This method has not been "+
"implemented for transferType " + transferType);
}
return getAlpha(pixel);
}
/**
* 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} passed in as an object
* reference. If {@code inData} is not a primitive array of type
* {@code transferType}, a {@code ClassCastException} is
* thrown. An {@code ArrayIndexOutOfBoundsException} is
* thrown if {@code inData} is not large enough to hold a pixel
* value for this {@code ColorModel}.
* The returned value is in a non pre-multiplied format. Thus, if
* the alpha is premultiplied, this method divides it out of the
* color components. If the alpha value is 0, for example, the color
* values is 0. Since {@code DirectColorModel} 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}.
*
* @param inData the specified pixel
* @return the color and alpha components of the specified pixel.
* @exception UnsupportedOperationException if this
* {@code transferType} is not supported by this
* {@code ColorModel}
* @see ColorModel#getRGBdefault
*/
public int getRGB(Object inData) {
int pixel=0;
switch (transferType) {
case DataBuffer.TYPE_BYTE:
byte[] bdata = (byte[])inData;
pixel = bdata[0] & 0xff;
break;
case DataBuffer.TYPE_USHORT:
short[] sdata = (short[])inData;
pixel = sdata[0] & 0xffff;
break;
case DataBuffer.TYPE_INT:
int[] idata = (int[])inData;
pixel = idata[0];
break;
default:
throw new UnsupportedOperationException("This method has not been "+
"implemented for transferType " + transferType);
}
return getRGB(pixel);
}
/**
* Returns a data element array representation of a pixel in this
* {@code ColorModel}, given an integer pixel representation in the
* default RGB color model.
* This array can then be passed to the {@code setDataElements}
* method of a {@code WritableRaster} object. If the pixel variable
* is {@code null}, a new array is allocated. If {@code pixel}
* is not {@code null}, it must be a primitive array of type
* {@code transferType}; otherwise, a
* {@code ClassCastException} is thrown. An
* {@code ArrayIndexOutOfBoundsException} is
* thrown if {@code pixel} is not large enough to hold a pixel
* value for this {@code ColorModel}. The pixel array is returned.
* Since {@code DirectColorModel} 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}.
*
* @param rgb the integer pixel representation in the default RGB
* color model
* @param pixel the specified pixel
* @return an array representation of the specified pixel in this
* {@code ColorModel}
* @exception ClassCastException if {@code pixel}
* is not a primitive array of type {@code transferType}
* @exception ArrayIndexOutOfBoundsException if
* {@code pixel} is not large enough to hold a pixel value
* for this {@code ColorModel}
* @exception UnsupportedOperationException if this
* {@code transferType} is not supported by this
* {@code ColorModel}
* @see WritableRaster#setDataElements
* @see SampleModel#setDataElements
*/
public Object getDataElements(int rgb, Object pixel) {
//REMIND: maybe more efficient not to use int array for
//DataBuffer.TYPE_USHORT and DataBuffer.TYPE_INT
int[] intpixel = null;
if (transferType == DataBuffer.TYPE_INT &&
pixel != null) {
intpixel = (int[])pixel;
intpixel[0] = 0;
} else {
intpixel = new int[1];
}
ColorModel defaultCM = ColorModel.getRGBdefault();
if (this == defaultCM || equals(defaultCM)) {
intpixel[0] = rgb;
return intpixel;
}
int red, grn, blu, alp;
red = (rgb>>16) & 0xff;
grn = (rgb>>8) & 0xff;
blu = rgb & 0xff;
if (is_sRGB || is_LinearRGB) {
int precision;
float factor;
if (is_LinearRGB) {
if (lRGBprecision == 8) {
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 (isAlphaPremultiplied) {
factor *= (alp * (1.0f / 255.0f));
precision = -1; // force component calculations below
}
if (nBits[3] != 8) {
alp = (int)
((alp * (1.0f / 255.0f) * ((1<