JDK8/Java8源码在线阅读
/*
* Copyright (c) 1997, 2013, 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.
*/
/*
**********************************************************************
**********************************************************************
**********************************************************************
*** COPYRIGHT (c) Eastman Kodak Company, 1997 ***
*** As an unpublished work pursuant to Title 17 of the United ***
*** States Code. All rights reserved. ***
**********************************************************************
**********************************************************************
**********************************************************************/
package java.awt.color;
import sun.java2d.cmm.ColorTransform;
import sun.java2d.cmm.CMSManager;
import sun.java2d.cmm.PCMM;
/**
*
* The ICC_ColorSpace class is an implementation of the abstract
* ColorSpace class. This representation of
* device independent and device dependent color spaces is based on the
* International Color Consortium Specification ICC.1:2001-12, File Format for
* Color Profiles (see <A href="http://www.color.org">http://www.color.org</A>).
* <p>
* Typically, a Color or ColorModel would be associated with an ICC
* Profile which is either an input, display, or output profile (see
* the ICC specification). There are other types of ICC Profiles, e.g.
* abstract profiles, device link profiles, and named color profiles,
* which do not contain information appropriate for representing the color
* space of a color, image, or device (see ICC_Profile).
* Attempting to create an ICC_ColorSpace object from an inappropriate ICC
* Profile is an error.
* <p>
* ICC Profiles represent transformations from the color space of
* the profile (e.g. a monitor) to a Profile Connection Space (PCS).
* Profiles of interest for tagging images or colors have a
* PCS which is one of the device independent
* spaces (one CIEXYZ space and two CIELab spaces) defined in the
* ICC Profile Format Specification. Most profiles of interest
* either have invertible transformations or explicitly specify
* transformations going both directions. Should an ICC_ColorSpace
* object be used in a way requiring a conversion from PCS to
* the profile's native space and there is inadequate data to
* correctly perform the conversion, the ICC_ColorSpace object will
* produce output in the specified type of color space (e.g. TYPE_RGB,
* TYPE_CMYK, etc.), but the specific color values of the output data
* will be undefined.
* <p>
* The details of this class are not important for simple applets,
* which draw in a default color space or manipulate and display
* imported images with a known color space. At most, such applets
* would need to get one of the default color spaces via
* ColorSpace.getInstance().
* @see ColorSpace
* @see ICC_Profile
*/
public class ICC_ColorSpace extends ColorSpace {
static final long serialVersionUID = 3455889114070431483L;
private ICC_Profile thisProfile;
private float[] minVal;
private float[] maxVal;
private float[] diffMinMax;
private float[] invDiffMinMax;
private boolean needScaleInit = true;
// {to,from}{RGB,CIEXYZ} methods create and cache these when needed
private transient ColorTransform this2srgb;
private transient ColorTransform srgb2this;
private transient ColorTransform this2xyz;
private transient ColorTransform xyz2this;
/**
* Constructs a new ICC_ColorSpace from an ICC_Profile object.
* @param profile the specified ICC_Profile object
* @exception IllegalArgumentException if profile is inappropriate for
* representing a ColorSpace.
*/
public ICC_ColorSpace (ICC_Profile profile) {
super (profile.getColorSpaceType(), profile.getNumComponents());
int profileClass = profile.getProfileClass();
/* REMIND - is NAMEDCOLOR OK? */
if ((profileClass != ICC_Profile.CLASS_INPUT) &&
(profileClass != ICC_Profile.CLASS_DISPLAY) &&
(profileClass != ICC_Profile.CLASS_OUTPUT) &&
(profileClass != ICC_Profile.CLASS_COLORSPACECONVERSION) &&
(profileClass != ICC_Profile.CLASS_NAMEDCOLOR) &&
(profileClass != ICC_Profile.CLASS_ABSTRACT)) {
throw new IllegalArgumentException("Invalid profile type");
}
thisProfile = profile;
setMinMax();
}
/**
* Returns the ICC_Profile for this ICC_ColorSpace.
* @return the ICC_Profile for this ICC_ColorSpace.
*/
public ICC_Profile getProfile() {
return thisProfile;
}
/**
* Transforms a color value assumed to be in this ColorSpace
* into a value in the default CS_sRGB color space.
* <p>
* This method transforms color values using algorithms designed
* to produce the best perceptual match between input and output
* colors. In order to do colorimetric conversion of color values,
* you should use the <code>toCIEXYZ</code>
* method of this color space to first convert from the input
* color space to the CS_CIEXYZ color space, and then use the
* <code>fromCIEXYZ</code> method of the CS_sRGB color space to
* convert from CS_CIEXYZ to the output color space.
* See {@link #toCIEXYZ(float[]) toCIEXYZ} and
* {@link #fromCIEXYZ(float[]) fromCIEXYZ} for further information.
* <p>
* @param colorvalue a float array with length of at least the number
* of components in this ColorSpace.
* @return a float array of length 3.
* @throws ArrayIndexOutOfBoundsException if array length is not
* at least the number of components in this ColorSpace.
*/
public float[] toRGB (float[] colorvalue) {
if (this2srgb == null) {
ColorTransform[] transformList = new ColorTransform [2];
ICC_ColorSpace srgbCS =
(ICC_ColorSpace) ColorSpace.getInstance (CS_sRGB);
PCMM mdl = CMSManager.getModule();
transformList[0] = mdl.createTransform(
thisProfile, ColorTransform.Any, ColorTransform.In);
transformList[1] = mdl.createTransform(
srgbCS.getProfile(), ColorTransform.Any, ColorTransform.Out);
this2srgb = mdl.createTransform(transformList);
if (needScaleInit) {
setComponentScaling();
}
}
int nc = this.getNumComponents();
short tmp[] = new short[nc];
for (int i = 0; i < nc; i++) {
tmp[i] = (short)
((colorvalue[i] - minVal[i]) * invDiffMinMax[i] + 0.5f);
}
tmp = this2srgb.colorConvert(tmp, null);
float[] result = new float [3];
for (int i = 0; i < 3; i++) {
result[i] = ((float) (tmp[i] & 0xffff)) / 65535.0f;
}
return result;
}
/**
* Transforms a color value assumed to be in the default CS_sRGB
* color space into this ColorSpace.
* <p>
* This method transforms color values using algorithms designed
* to produce the best perceptual match between input and output
* colors. In order to do colorimetric conversion of color values,
* you should use the <code>toCIEXYZ</code>
* method of the CS_sRGB color space to first convert from the input
* color space to the CS_CIEXYZ color space, and then use the
* <code>fromCIEXYZ</code> method of this color space to
* convert from CS_CIEXYZ to the output color space.
* See {@link #toCIEXYZ(float[]) toCIEXYZ} and
* {@link #fromCIEXYZ(float[]) fromCIEXYZ} for further information.
* <p>
* @param rgbvalue a float array with length of at least 3.
* @return a float array with length equal to the number of
* components in this ColorSpace.
* @throws ArrayIndexOutOfBoundsException if array length is not
* at least 3.
*/
public float[] fromRGB(float[] rgbvalue) {
if (srgb2this == null) {
ColorTransform[] transformList = new ColorTransform [2];
ICC_ColorSpace srgbCS =
(ICC_ColorSpace) ColorSpace.getInstance (CS_sRGB);
PCMM mdl = CMSManager.getModule();
transformList[0] = mdl.createTransform(
srgbCS.getProfile(), ColorTransform.Any, ColorTransform.In);
transformList[1] = mdl.createTransform(
thisProfile, ColorTransform.Any, ColorTransform.Out);
srgb2this = mdl.createTransform(transformList);
if (needScaleInit) {
setComponentScaling();
}
}
short tmp[] = new short[3];
for (int i = 0; i < 3; i++) {
tmp[i] = (short) ((rgbvalue[i] * 65535.0f) + 0.5f);
}
tmp = srgb2this.colorConvert(tmp, null);
int nc = this.getNumComponents();
float[] result = new float [nc];
for (int i = 0; i < nc; i++) {
result[i] = (((float) (tmp[i] & 0xffff)) / 65535.0f) *
diffMinMax[i] + minVal[i];
}
return result;
}
/**
* Transforms a color value assumed to be in this ColorSpace
* into the CS_CIEXYZ conversion color space.
* <p>
* This method transforms color values using relative colorimetry,
* as defined by the ICC Specification. This
* means that the XYZ values returned by this method are represented
* relative to the D50 white point of the CS_CIEXYZ color space.
* This representation is useful in a two-step color conversion
* process in which colors are transformed from an input color
* space to CS_CIEXYZ and then to an output color space. This
* representation is not the same as the XYZ values that would
* be measured from the given color value by a colorimeter.
* A further transformation is necessary to compute the XYZ values
* that would be measured using current CIE recommended practices.
* The paragraphs below explain this in more detail.
* <p>
* The ICC standard uses a device independent color space (DICS) as the
* mechanism for converting color from one device to another device. In
* this architecture, colors are converted from the source device's color
* space to the ICC DICS and then from the ICC DICS to the destination
* device's color space. The ICC standard defines device profiles which
* contain transforms which will convert between a device's color space
* and the ICC DICS. The overall conversion of colors from a source
* device to colors of a destination device is done by connecting the
* device-to-DICS transform of the profile for the source device to the
* DICS-to-device transform of the profile for the destination device.
* For this reason, the ICC DICS is commonly referred to as the profile
* connection space (PCS). The color space used in the methods
* toCIEXYZ and fromCIEXYZ is the CIEXYZ PCS defined by the ICC
* Specification. This is also the color space represented by
* ColorSpace.CS_CIEXYZ.
* <p>
* The XYZ values of a color are often represented as relative to some
* white point, so the actual meaning of the XYZ values cannot be known
* without knowing the white point of those values. This is known as
* relative colorimetry. The PCS uses a white point of D50, so the XYZ
* values of the PCS are relative to D50. For example, white in the PCS
* will have the XYZ values of D50, which is defined to be X=.9642,
* Y=1.000, and Z=0.8249. This white point is commonly used for graphic
* arts applications, but others are often used in other applications.
* <p>
* To quantify the color characteristics of a device such as a printer
* or monitor, measurements of XYZ values for particular device colors
* are typically made. For purposes of this discussion, the term
* device XYZ values is used to mean the XYZ values that would be
* measured from device colors using current CIE recommended practices.
* <p>
* Converting between device XYZ values and the PCS XYZ values returned
* by this method corresponds to converting between the device's color
* space, as represented by CIE colorimetric values, and the PCS. There
* are many factors involved in this process, some of which are quite
* subtle. The most important, however, is the adjustment made to account
* for differences between the device's white point and the white point of
* the PCS. There are many techniques for doing this and it is the
* subject of much current research and controversy. Some commonly used
* methods are XYZ scaling, the von Kries transform, and the Bradford
* transform. The proper method to use depends upon each particular
* application.
* <p>
* The simplest method is XYZ scaling. In this method each device XYZ
* value is converted to a PCS XYZ value by multiplying it by the ratio
* of the PCS white point (D50) to the device white point.
* <pre>
*
* Xd, Yd, Zd are the device XYZ values
* Xdw, Ydw, Zdw are the device XYZ white point values
* Xp, Yp, Zp are the PCS XYZ values
* Xd50, Yd50, Zd50 are the PCS XYZ white point values
*
* Xp = Xd * (Xd50 / Xdw)
* Yp = Yd * (Yd50 / Ydw)
* Zp = Zd * (Zd50 / Zdw)
*
* </pre>
* <p>
* Conversion from the PCS to the device would be done by inverting these
* equations:
* <pre>
*
* Xd = Xp * (Xdw / Xd50)
* Yd = Yp * (Ydw / Yd50)
* Zd = Zp * (Zdw / Zd50)
*
* </pre>
* <p>
* Note that the media white point tag in an ICC profile is not the same
* as the device white point. The media white point tag is expressed in
* PCS values and is used to represent the difference between the XYZ of
* device illuminant and the XYZ of the device media when measured under
* that illuminant. The device white point is expressed as the device
* XYZ values corresponding to white displayed on the device. For
* example, displaying the RGB color (1.0, 1.0, 1.0) on an sRGB device
* will result in a measured device XYZ value of D65. This will not
* be the same as the media white point tag XYZ value in the ICC
* profile for an sRGB device.
* <p>
* @param colorvalue a float array with length of at least the number
* of components in this ColorSpace.
* @return a float array of length 3.
* @throws ArrayIndexOutOfBoundsException if array length is not
* at least the number of components in this ColorSpace.
*/
public float[] toCIEXYZ(float[] colorvalue) {
if (this2xyz == null) {
ColorTransform[] transformList = new ColorTransform [2];
ICC_ColorSpace xyzCS =
(ICC_ColorSpace) ColorSpace.getInstance (CS_CIEXYZ);
PCMM mdl = CMSManager.getModule();
try {
transformList[0] = mdl.createTransform(
thisProfile, ICC_Profile.icRelativeColorimetric,
ColorTransform.In);
} catch (CMMException e) {
transformList[0] = mdl.createTransform(
thisProfile, ColorTransform.Any, ColorTransform.In);
}
transformList[1] = mdl.createTransform(
xyzCS.getProfile(), ColorTransform.Any, ColorTransform.Out);
this2xyz = mdl.createTransform (transformList);
if (needScaleInit) {
setComponentScaling();
}
}
int nc = this.getNumComponents();
short tmp[] = new short[nc];
for (int i = 0; i < nc; i++) {
tmp[i] = (short)
((colorvalue[i] - minVal[i]) * invDiffMinMax[i] + 0.5f);
}
tmp = this2xyz.colorConvert(tmp, null);
float ALMOST_TWO = 1.0f + (32767.0f / 32768.0f);
// For CIEXYZ, min = 0.0, max = ALMOST_TWO for all components
float[] result = new float [3];
for (int i = 0; i < 3; i++) {
result[i] = (((float) (tmp[i] & 0xffff)) / 65535.0f) * ALMOST_TWO;
}
return result;
}
/**
* Transforms a color value assumed to be in the CS_CIEXYZ conversion
* color space into this ColorSpace.
* <p>
* This method transforms color values using relative colorimetry,
* as defined by the ICC Specification. This
* means that the XYZ argument values taken by this method are represented
* relative to the D50 white point of the CS_CIEXYZ color space.
* This representation is useful in a two-step color conversion
* process in which colors are transformed from an input color
* space to CS_CIEXYZ and then to an output color space. The color
* values returned by this method are not those that would produce
* the XYZ value passed to the method when measured by a colorimeter.
* If you have XYZ values corresponding to measurements made using
* current CIE recommended practices, they must be converted to D50
* relative values before being passed to this method.
* The paragraphs below explain this in more detail.
* <p>
* The ICC standard uses a device independent color space (DICS) as the
* mechanism for converting color from one device to another device. In
* this architecture, colors are converted from the source device's color
* space to the ICC DICS and then from the ICC DICS to the destination
* device's color space. The ICC standard defines device profiles which
* contain transforms which will convert between a device's color space
* and the ICC DICS. The overall conversion of colors from a source
* device to colors of a destination device is done by connecting the
* device-to-DICS transform of the profile for the source device to the
* DICS-to-device transform of the profile for the destination device.
* For this reason, the ICC DICS is commonly referred to as the profile
* connection space (PCS). The color space used in the methods
* toCIEXYZ and fromCIEXYZ is the CIEXYZ PCS defined by the ICC
* Specification. This is also the color space represented by
* ColorSpace.CS_CIEXYZ.
* <p>
* The XYZ values of a color are often represented as relative to some
* white point, so the actual meaning of the XYZ values cannot be known
* without knowing the white point of those values. This is known as
* relative colorimetry. The PCS uses a white point of D50, so the XYZ
* values of the PCS are relative to D50. For example, white in the PCS
* will have the XYZ values of D50, which is defined to be X=.9642,
* Y=1.000, and Z=0.8249. This white point is commonly used for graphic
* arts applications, but others are often used in other applications.
* <p>
* To quantify the color characteristics of a device such as a printer
* or monitor, measurements of XYZ values for particular device colors
* are typically made. For purposes of this discussion, the term
* device XYZ values is used to mean the XYZ values that would be
* measured from device colors using current CIE recommended practices.
* <p>
* Converting between device XYZ values and the PCS XYZ values taken as
* arguments by this method corresponds to converting between the device's
* color space, as represented by CIE colorimetric values, and the PCS.
* There are many factors involved in this process, some of which are quite
* subtle. The most important, however, is the adjustment made to account
* for differences between the device's white point and the white point of
* the PCS. There are many techniques for doing this and it is the
* subject of much current research and controversy. Some commonly used
* methods are XYZ scaling, the von Kries transform, and the Bradford
* transform. The proper method to use depends upon each particular
* application.
* <p>
* The simplest method is XYZ scaling. In this method each device XYZ
* value is converted to a PCS XYZ value by multiplying it by the ratio
* of the PCS white point (D50) to the device white point.
* <pre>
*
* Xd, Yd, Zd are the device XYZ values
* Xdw, Ydw, Zdw are the device XYZ white point values
* Xp, Yp, Zp are the PCS XYZ values
* Xd50, Yd50, Zd50 are the PCS XYZ white point values
*
* Xp = Xd * (Xd50 / Xdw)
* Yp = Yd * (Yd50 / Ydw)
* Zp = Zd * (Zd50 / Zdw)
*
* </pre>
* <p>
* Conversion from the PCS to the device would be done by inverting these
* equations:
* <pre>
*
* Xd = Xp * (Xdw / Xd50)
* Yd = Yp * (Ydw / Yd50)
* Zd = Zp * (Zdw / Zd50)
*
* </pre>
* <p>
* Note that the media white point tag in an ICC profile is not the same
* as the device white point. The media white point tag is expressed in
* PCS values and is used to represent the difference between the XYZ of
* device illuminant and the XYZ of the device media when measured under
* that illuminant. The device white point is expressed as the device
* XYZ values corresponding to white displayed on the device. For
* example, displaying the RGB color (1.0, 1.0, 1.0) on an sRGB device
* will result in a measured device XYZ value of D65. This will not
* be the same as the media white point tag XYZ value in the ICC
* profile for an sRGB device.
* <p>
* @param colorvalue a float array with length of at least 3.
* @return a float array with length equal to the number of
* components in this ColorSpace.
* @throws ArrayIndexOutOfBoundsException if array length is not
* at least 3.
*/
public float[] fromCIEXYZ(float[] colorvalue) {
if (xyz2this == null) {
ColorTransform[] transformList = new ColorTransform [2];
ICC_ColorSpace xyzCS =
(ICC_ColorSpace) ColorSpace.getInstance (CS_CIEXYZ);
PCMM mdl = CMSManager.getModule();
transformList[0] = mdl.createTransform (
xyzCS.getProfile(), ColorTransform.Any, ColorTransform.In);
try {
transformList[1] = mdl.createTransform(
thisProfile, ICC_Profile.icRelativeColorimetric,
ColorTransform.Out);
} catch (CMMException e) {
transformList[1] = CMSManager.getModule().createTransform(
thisProfile, ColorTransform.Any, ColorTransform.Out);
}
xyz2this = mdl.createTransform(transformList);
if (needScaleInit) {
setComponentScaling();
}
}
short tmp[] = new short[3];
float ALMOST_TWO = 1.0f + (32767.0f / 32768.0f);
float factor = 65535.0f / ALMOST_TWO;
// For CIEXYZ, min = 0.0, max = ALMOST_TWO for all components
for (int i = 0; i < 3; i++) {
tmp[i] = (short) ((colorvalue[i] * factor) + 0.5f);
}
tmp = xyz2this.colorConvert(tmp, null);
int nc = this.getNumComponents();
float[] result = new float [nc];
for (int i = 0; i < nc; i++) {
result[i] = (((float) (tmp[i] & 0xffff)) / 65535.0f) *
diffMinMax[i] + minVal[i];
}
return result;
}
/**
* Returns the minimum normalized color component value for the
* specified component. For TYPE_XYZ spaces, this method returns
* minimum values of 0.0 for all components. For TYPE_Lab spaces,
* this method returns 0.0 for L and -128.0 for a and b components.
* This is consistent with the encoding of the XYZ and Lab Profile
* Connection Spaces in the ICC specification. For all other types, this
* method returns 0.0 for all components. When using an ICC_ColorSpace
* with a profile that requires different minimum component values,
* it is necessary to subclass this class and override this method.
* @param component The component index.
* @return The minimum normalized component value.
* @throws IllegalArgumentException if component is less than 0 or
/**代码未完, 请加载全部代码(NowJava.com).**/
关注时代Java
关注时代Java