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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/awt/image/PackedColorModel.java | |
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Diffstat (limited to 'libjava/classpath/java/awt/image/PackedColorModel.java')
-rw-r--r-- | libjava/classpath/java/awt/image/PackedColorModel.java | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/libjava/classpath/java/awt/image/PackedColorModel.java b/libjava/classpath/java/awt/image/PackedColorModel.java new file mode 100644 index 000000000..a89d73b8c --- /dev/null +++ b/libjava/classpath/java/awt/image/PackedColorModel.java @@ -0,0 +1,188 @@ +/* Copyright (C) 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.BitMaskExtent; + +import java.awt.Point; +import java.awt.color.ColorSpace; + +/** + * @author Rolf W. Rasmussen (rolfwr@ii.uib.no) + */ +public abstract class PackedColorModel extends ColorModel +{ + private int masks[]; + + /* Package accessibility, the DirectColorModel needs this array */ + int shifts[]; + + public PackedColorModel(ColorSpace cspace, int pixelBits, + int[] colorMaskArray, int alphaMask, + boolean isAlphaPremultiplied, + int transparency, + int transferType) + { + super(pixelBits, calcBitsPerComponent(colorMaskArray, alphaMask), + cspace, (alphaMask != 0), isAlphaPremultiplied, transparency, + transferType); + initMasks(colorMaskArray, alphaMask); + if ((pixelBits<1) || (pixelBits>32)) { + throw new IllegalArgumentException("pixels per bits must be " + + "in the range [1, 32]"); + } + } + + private static int[] calcBitsPerComponent(int[] colorMaskArray, + int alphaMask) + { + int numComponents = colorMaskArray.length; + if (alphaMask != 0) numComponents++; + + int[] bitsPerComponent = new int[numComponents]; + + BitMaskExtent extent = new BitMaskExtent(); + for (int b=0; b<colorMaskArray.length; b++) + { + extent.setMask(colorMaskArray[b]); + bitsPerComponent[b] = extent.bitWidth; + } + if (alphaMask != 0) + { + extent.setMask(alphaMask); + bitsPerComponent[numComponents-1] = extent.bitWidth; + } + return bitsPerComponent; + } + + /** Initializes the masks. */ + private void initMasks(int[] colorMaskArray, int alphaMask) + { + int numComponents = colorMaskArray.length; + if (alphaMask == 0) + { + masks = colorMaskArray; + } + else + { + masks = new int[numComponents+1]; + System.arraycopy(colorMaskArray, 0, + masks, 0, + numComponents); + masks[numComponents++] = alphaMask; + } + + shifts = new int[numComponents]; + + // Bit field handling have been moved to a utility class + BitMaskExtent extent = new BitMaskExtent(); + for (int b=0; b<numComponents; b++) + { + extent.setMask(masks[b]); + shifts[b] = extent.leastSignificantBit; + } + } + + public PackedColorModel(ColorSpace cspace, int pixelBits, + int rmask, int gmask, int bmask, + int amask, boolean isAlphaPremultiplied, + int transparency, + int transferType) + { + this(cspace, pixelBits, makeColorMaskArray(rmask, gmask, bmask), + amask, isAlphaPremultiplied, transparency, transferType); + } + + /* TODO: If there is a alpha mask, it is inefficient to create a + color mask array that will be discarded when the alpha mask is + appended. We should probably create a private constructor that + takes a complete array of masks (color+alpha) as an + argument. */ + + private static int[] makeColorMaskArray(int rmask, int gmask, int bmask) + { + int[] colorMaskArray = { rmask, gmask, bmask }; + return colorMaskArray; + } + + public final int getMask(int index) + { + return masks[index]; + } + + public final int[] getMasks() + { + return masks; + } + + public SampleModel createCompatibleSampleModel(int w, int h) + { + return new SinglePixelPackedSampleModel(transferType, w, h, masks); + } + + public boolean isCompatibleSampleModel(SampleModel sm) + { + if (!super.isCompatibleSampleModel(sm)) return false; + if (!(sm instanceof SinglePixelPackedSampleModel)) return false; + + SinglePixelPackedSampleModel sppsm = + (SinglePixelPackedSampleModel) sm; + return java.util.Arrays.equals(sppsm.getBitMasks(), masks); + } + + public WritableRaster getAlphaRaster(WritableRaster raster) { + if (!hasAlpha()) return null; + + SampleModel sm = raster.getSampleModel(); + int[] alphaBand = { sm.getNumBands() - 1 }; + SampleModel alphaModel = sm.createSubsetSampleModel(alphaBand); + DataBuffer buffer = raster.getDataBuffer(); + Point origin = new Point(0, 0); + return Raster.createWritableRaster(alphaModel, buffer, origin); + } + + public boolean equals(Object obj) + { + if (!super.equals(obj)) return false; + if (!(obj instanceof PackedColorModel)) return false; + + PackedColorModel other = (PackedColorModel) obj; + + return java.util.Arrays.equals(masks, other.masks); + } +} |