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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/awt/image/DirectColorModel.java
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+/* 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();
+ }
+}