437 lines
13 KiB
Java
437 lines
13 KiB
Java
/* DirectColorModel.java --
|
|
Copyright (C) 1999, 2000, 2002, 2004 Free Software Foundation
|
|
|
|
This file is part of GNU Classpath.
|
|
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
|
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
02110-1301 USA.
|
|
|
|
Linking this library statically or dynamically with other modules is
|
|
making a combined work based on this library. Thus, the terms and
|
|
conditions of the GNU General Public License cover the whole
|
|
combination.
|
|
|
|
As a special exception, the copyright holders of this library give you
|
|
permission to link this library with independent modules to produce an
|
|
executable, regardless of the license terms of these independent
|
|
modules, and to copy and distribute the resulting executable under
|
|
terms of your choice, provided that you also meet, for each linked
|
|
independent module, the terms and conditions of the license of that
|
|
module. An independent module is a module which is not derived from
|
|
or based on this library. If you modify this library, you may extend
|
|
this exception to your version of the library, but you are not
|
|
obligated to do so. If you do not wish to do so, delete this
|
|
exception statement from your version. */
|
|
|
|
|
|
package java.awt.image;
|
|
|
|
import gnu.java.awt.Buffers;
|
|
|
|
import java.awt.Point;
|
|
import java.awt.Transparency;
|
|
import java.awt.color.ColorSpace;
|
|
|
|
/**
|
|
* @author Rolf W. Rasmussen (rolfwr@ii.uib.no)
|
|
* @author C. Brian Jones (cbj@gnu.org)
|
|
* @author Mark Benvenuto (mcb54@columbia.edu)
|
|
*/
|
|
public class DirectColorModel extends PackedColorModel
|
|
{
|
|
/**
|
|
* For the color model created with this constructor the pixels
|
|
* will have fully opaque alpha components with a value of 255.
|
|
* Each mask should describe a fully contiguous set of bits in the
|
|
* most likely order of alpha, red, green, blue from the most significant
|
|
* byte to the least significant byte.
|
|
*
|
|
* @param pixelBits the number of bits wide used for bit size of pixel values
|
|
* @param rmask the bits describing the red component of a pixel
|
|
* @param gmask the bits describing the green component of a pixel
|
|
* @param bmask the bits describing the blue component of a pixel
|
|
*/
|
|
public DirectColorModel(int pixelBits, int rmask, int gmask, int bmask)
|
|
{
|
|
this(ColorSpace.getInstance(ColorSpace.CS_sRGB), pixelBits,
|
|
rmask, gmask, bmask, 0,
|
|
false, // not alpha premultiplied
|
|
Buffers.smallestAppropriateTransferType(pixelBits) // find type
|
|
);
|
|
}
|
|
|
|
/**
|
|
* For the color model created with this constructor the pixels
|
|
* will have fully opaque alpha components with a value of 255.
|
|
* Each mask should describe a fully contiguous set of bits in the
|
|
* most likely order of red, green, blue from the most significant
|
|
* byte to the least significant byte.
|
|
*
|
|
* @param pixelBits the number of bits wide used for bit size of pixel values
|
|
* @param rmask the bits describing the red component of a pixel
|
|
* @param gmask the bits describing the green component of a pixel
|
|
* @param bmask the bits describing the blue component of a pixel
|
|
* @param amask the bits describing the alpha component of a pixel
|
|
*/
|
|
public DirectColorModel(int pixelBits,
|
|
int rmask, int gmask, int bmask, int amask)
|
|
{
|
|
this(ColorSpace.getInstance(ColorSpace.CS_sRGB), pixelBits,
|
|
rmask, gmask, bmask, amask,
|
|
false, // not alpha premultiplied
|
|
Buffers.smallestAppropriateTransferType(pixelBits) // find type
|
|
);
|
|
}
|
|
|
|
public DirectColorModel(ColorSpace cspace, int pixelBits,
|
|
int rmask, int gmask, int bmask, int amask,
|
|
boolean isAlphaPremultiplied,
|
|
int transferType)
|
|
{
|
|
super(cspace, pixelBits,
|
|
rmask, gmask, bmask, amask, isAlphaPremultiplied,
|
|
((amask == 0) ? Transparency.OPAQUE : Transparency.TRANSLUCENT),
|
|
transferType);
|
|
}
|
|
|
|
public final int getRedMask()
|
|
{
|
|
return getMask(0);
|
|
}
|
|
|
|
public final int getGreenMask()
|
|
{
|
|
return getMask(1);
|
|
}
|
|
|
|
public final int getBlueMask()
|
|
{
|
|
return getMask(2);
|
|
}
|
|
|
|
public final int getAlphaMask()
|
|
{
|
|
return hasAlpha() ? getMask(3) : 0;
|
|
}
|
|
|
|
/**
|
|
* Get the red component of the given pixel.
|
|
* <br>
|
|
*/
|
|
public final int getRed(int pixel)
|
|
{
|
|
return extractAndNormalizeSample(pixel, 0);
|
|
}
|
|
|
|
/**
|
|
* Get the green component of the given pixel.
|
|
* <br>
|
|
*/
|
|
public final int getGreen(int pixel)
|
|
{
|
|
return extractAndNormalizeSample(pixel, 1);
|
|
}
|
|
|
|
/**
|
|
* Get the blue component of the given pixel.
|
|
* <br>
|
|
*/
|
|
public final int getBlue(int pixel)
|
|
{
|
|
return extractAndNormalizeSample(pixel, 2);
|
|
}
|
|
|
|
/**
|
|
* Get the alpha component of the given pixel.
|
|
* <br>
|
|
*/
|
|
public final int getAlpha(int pixel)
|
|
{
|
|
if (!hasAlpha())
|
|
return 255;
|
|
return extractAndScaleSample(pixel, 3);
|
|
}
|
|
|
|
private int extractAndNormalizeSample(int pixel, int component)
|
|
{
|
|
int value = extractAndScaleSample(pixel, component);
|
|
if (hasAlpha() && isAlphaPremultiplied() && getAlpha(pixel) != 0)
|
|
value = value*255/getAlpha(pixel);
|
|
return value;
|
|
}
|
|
|
|
private int extractAndScaleSample(int pixel, int component)
|
|
{
|
|
int field = pixel & getMask(component);
|
|
int to8BitShift =
|
|
8 - shifts[component] - getComponentSize(component);
|
|
return (to8BitShift>0) ?
|
|
(field << to8BitShift) :
|
|
(field >>> (-to8BitShift));
|
|
}
|
|
|
|
/**
|
|
* Get the RGB color value of the given pixel using the default
|
|
* RGB color model.
|
|
* <br>
|
|
*
|
|
* @param pixel a pixel value
|
|
*/
|
|
public final int getRGB(int pixel)
|
|
{
|
|
/* FIXME: The Sun docs show that this method is overridden, but I
|
|
don't see any way to improve on the superclass
|
|
implementation. */
|
|
return super.getRGB(pixel);
|
|
}
|
|
|
|
public int getRed(Object inData)
|
|
{
|
|
return getRed(getPixelFromArray(inData));
|
|
}
|
|
|
|
public int getGreen(Object inData)
|
|
{
|
|
return getGreen(getPixelFromArray(inData));
|
|
}
|
|
|
|
public int getBlue(Object inData)
|
|
{
|
|
return getBlue(getPixelFromArray(inData));
|
|
}
|
|
|
|
public int getAlpha(Object inData)
|
|
{
|
|
return getAlpha(getPixelFromArray(inData));
|
|
}
|
|
|
|
public int getRGB(Object inData)
|
|
{
|
|
return getRGB(getPixelFromArray(inData));
|
|
}
|
|
|
|
/**
|
|
* Converts a normalized pixel int value in the sRGB color
|
|
* space to an array containing a single pixel of the color space
|
|
* of the color model.
|
|
*
|
|
* <p>This method performs the inverse function of
|
|
* <code>getRGB(Object inData)</code>.
|
|
*
|
|
* @param rgb pixel as a normalized sRGB, 0xAARRGGBB value.
|
|
*
|
|
* @param pixel to avoid needless creation of arrays, an array to
|
|
* use to return the pixel can be given. If null, a suitable array
|
|
* will be created.
|
|
*
|
|
* @return array of transferType containing a single pixel. The
|
|
* pixel should be encoded in the natural way of the color model.
|
|
*
|
|
* @see #getRGB(Object)
|
|
*/
|
|
public Object getDataElements(int rgb, Object pixel)
|
|
{
|
|
// FIXME: handle alpha multiply
|
|
|
|
int pixelValue = 0;
|
|
int a = 0;
|
|
if (hasAlpha()) {
|
|
a = (rgb >>> 24) & 0xff;
|
|
pixelValue = valueToField(a, 3, 8);
|
|
}
|
|
|
|
if (hasAlpha() && isAlphaPremultiplied())
|
|
{
|
|
int r, g, b;
|
|
/* if r=0xff and a=0xff, then resulting
|
|
value will be (r*a)>>>8 == 0xfe... This seems wrong.
|
|
We should divide by 255 rather than shifting >>>8 after
|
|
multiplying.
|
|
|
|
Too bad, shifting is probably less expensive.
|
|
r = ((rgb >>> 16) & 0xff)*a;
|
|
g = ((rgb >>> 8) & 0xff)*a;
|
|
b = ((rgb >>> 0) & 0xff)*a; */
|
|
/* The r, g, b values we calculate are 16 bit. This allows
|
|
us to avoid discarding the lower 8 bits obtained if
|
|
multiplying with the alpha band. */
|
|
|
|
// using 16 bit values
|
|
r = ((rgb >>> 8) & 0xff00)*a/255;
|
|
g = ((rgb >>> 0) & 0xff00)*a/255;
|
|
b = ((rgb << 8) & 0xff00)*a/255;
|
|
pixelValue |=
|
|
valueToField(r, 0, 16) | // Red
|
|
valueToField(g, 1, 16) | // Green
|
|
valueToField(b, 2, 16); // Blue
|
|
}
|
|
else
|
|
{
|
|
int r, g, b;
|
|
// using 8 bit values
|
|
r = (rgb >>> 16) & 0xff;
|
|
g = (rgb >>> 8) & 0xff;
|
|
b = (rgb >>> 0) & 0xff;
|
|
|
|
pixelValue |=
|
|
valueToField(r, 0, 8) | // Red
|
|
valueToField(g, 1, 8) | // Green
|
|
valueToField(b, 2, 8); // Blue
|
|
}
|
|
|
|
/* In this color model, the whole pixel fits in the first element
|
|
of the array. */
|
|
DataBuffer buffer = Buffers.createBuffer(transferType, pixel, 1);
|
|
buffer.setElem(0, pixelValue);
|
|
return Buffers.getData(buffer);
|
|
}
|
|
|
|
/**
|
|
* Converts a value to the correct field bits based on the
|
|
* information derived from the field masks.
|
|
*
|
|
* @param highBit the position of the most significant bit in the
|
|
* val parameter.
|
|
*/
|
|
private int valueToField(int val, int component, int highBit)
|
|
{
|
|
int toFieldShift =
|
|
getComponentSize(component) + shifts[component] - highBit;
|
|
int ret = (toFieldShift>0) ?
|
|
(val << toFieldShift) :
|
|
(val >>> (-toFieldShift));
|
|
return ret & getMask(component);
|
|
}
|
|
|
|
/**
|
|
* Converts a 16 bit value to the correct field bits based on the
|
|
* information derived from the field masks.
|
|
*/
|
|
private int value16ToField(int val, int component)
|
|
{
|
|
int toFieldShift = getComponentSize(component) + shifts[component] - 16;
|
|
return (toFieldShift>0) ?
|
|
(val << toFieldShift) :
|
|
(val >>> (-toFieldShift));
|
|
}
|
|
|
|
/**
|
|
* Fills an array with the unnormalized component samples from a
|
|
* pixel value. I.e. decompose the pixel, but not perform any
|
|
* color conversion.
|
|
*/
|
|
public final int[] getComponents(int pixel, int[] components, int offset)
|
|
{
|
|
int numComponents = getNumComponents();
|
|
if (components == null) components = new int[offset + numComponents];
|
|
|
|
for (int b=0; b<numComponents; b++)
|
|
components[offset++] = (pixel&getMask(b)) >>> shifts[b];
|
|
|
|
return components;
|
|
}
|
|
|
|
public final int[] getComponents(Object pixel, int[] components,
|
|
int offset)
|
|
{
|
|
return getComponents(getPixelFromArray(pixel), components, offset);
|
|
}
|
|
|
|
/**
|
|
* Creates a <code>WriteableRaster</code> that has a <code>SampleModel</code>
|
|
* that is compatible with this <code>ColorModel</code>.
|
|
*
|
|
* @param w the width of the writeable raster to create
|
|
* @param h the height of the writeable raster to create
|
|
*
|
|
* @throws IllegalArgumentException if <code>w</code> or <code>h</code>
|
|
* is less than or equal to zero
|
|
*/
|
|
public final WritableRaster createCompatibleWritableRaster(int w, int h)
|
|
{
|
|
// Sun also makes this check here.
|
|
if(w <= 0 || h <= 0)
|
|
throw new IllegalArgumentException("width (=" + w + ") and height (="
|
|
+ h + ") must be > 0");
|
|
|
|
SampleModel sm = createCompatibleSampleModel(w, h);
|
|
Point origin = new Point(0, 0);
|
|
return Raster.createWritableRaster(sm, origin);
|
|
}
|
|
|
|
public int getDataElement(int[] components, int offset)
|
|
{
|
|
int numComponents = getNumComponents();
|
|
int pixelValue = 0;
|
|
|
|
for (int c=0; c<numComponents; c++)
|
|
pixelValue |= (components[offset++] << shifts[c]) & getMask(c);
|
|
|
|
return pixelValue;
|
|
}
|
|
|
|
public Object getDataElements(int[] components, int offset, Object obj)
|
|
{
|
|
/* In this color model, the whole pixel fits in the first element
|
|
of the array. */
|
|
int pixelValue = getDataElement(components, offset);
|
|
|
|
DataBuffer buffer = Buffers.createBuffer(transferType, obj, 1);
|
|
buffer.setElem(0, pixelValue);
|
|
return Buffers.getData(buffer);
|
|
}
|
|
|
|
public final ColorModel coerceData (WritableRaster raster,
|
|
boolean isAlphaPremultiplied)
|
|
{
|
|
if (this.isAlphaPremultiplied == isAlphaPremultiplied || !hasAlpha())
|
|
return this;
|
|
|
|
/* TODO: provide better implementation based on the
|
|
assumptions we can make due to the specific type of the
|
|
color model. */
|
|
coerceDataWorker(raster, isAlphaPremultiplied);
|
|
|
|
return new DirectColorModel(cspace, pixel_bits, getRedMask(),
|
|
getGreenMask(), getBlueMask(), getAlphaMask(),
|
|
isAlphaPremultiplied, transferType);
|
|
}
|
|
|
|
public boolean isCompatibleRaster(Raster raster)
|
|
{
|
|
/* FIXME: the Sun docs say this method is overridden here,
|
|
but I don't see any way to improve upon the implementation
|
|
in ColorModel. */
|
|
return super.isCompatibleRaster(raster);
|
|
}
|
|
|
|
String stringParam()
|
|
{
|
|
return super.stringParam() +
|
|
", redMask=" + Integer.toHexString(getRedMask()) +
|
|
", greenMask=" + Integer.toHexString(getGreenMask()) +
|
|
", blueMask=" + Integer.toHexString(getBlueMask()) +
|
|
", alphaMask=" + Integer.toHexString(getAlphaMask());
|
|
}
|
|
|
|
public String toString()
|
|
{
|
|
/* FIXME: Again, docs say override, but how do we improve upon the
|
|
superclass implementation? */
|
|
return super.toString();
|
|
}
|
|
}
|
|
|