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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/ComponentColorModel.java | |
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Diffstat (limited to 'libjava/classpath/java/awt/image/ComponentColorModel.java')
-rw-r--r-- | libjava/classpath/java/awt/image/ComponentColorModel.java | 408 |
1 files changed, 408 insertions, 0 deletions
diff --git a/libjava/classpath/java/awt/image/ComponentColorModel.java b/libjava/classpath/java/awt/image/ComponentColorModel.java new file mode 100644 index 000000000..ef0b84f00 --- /dev/null +++ b/libjava/classpath/java/awt/image/ComponentColorModel.java @@ -0,0 +1,408 @@ +/* ComponentColorModel.java -- + 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.Buffers; + +import java.awt.Point; +import java.awt.color.ColorSpace; +import java.util.Arrays; + +public class ComponentColorModel extends ColorModel +{ + // Find sum of all elements of the array. + private static int sum(int[] values) + { + int sum = 0; + for (int i=0; i<values.length; i++) + sum += values[i]; + return sum; + } + + // Create an appropriate array of bits, given a colorspace (ie, number of + // bands), size of the storage data type, and presence of an alpha band. + private static int[] findBits(ColorSpace colorSpace, int transferType, + boolean hasAlpha) + { + int[] bits; + if (hasAlpha) + bits = new int[colorSpace.getNumComponents()+1]; + else + bits = new int[colorSpace.getNumComponents()]; + + Arrays.fill(bits, DataBuffer.getDataTypeSize(transferType)); + + return bits; + } + + public ComponentColorModel(ColorSpace colorSpace, int[] bits, + boolean hasAlpha, + boolean isAlphaPremultiplied, + int transparency, int transferType) + { + super(sum(bits), bits, colorSpace, hasAlpha, isAlphaPremultiplied, + transparency, transferType); + } + + /** + * Construct a new ComponentColorModel. + * + * This constructor makes all bits of each sample significant, so for a + * transferType of DataBuffer.BYTE, the bits per sample is 8, etc. If + * both hasAlpha and isAlphaPremultiplied are true, color samples are + * assumed to be premultiplied by the alpha component. Transparency may be + * one of OPAQUE, BITMASK, or TRANSLUCENT. + * + * @param colorSpace The colorspace for this color model. + * @param hasAlpha True if there is an alpha component. + * @param isAlphaPremultiplied True if colors are already multiplied by + * alpha. + * @param transparency The type of alpha values. + * @param transferType Data type of pixel sample values. + * @since 1.4 + */ + public ComponentColorModel(ColorSpace colorSpace, + boolean hasAlpha, + boolean isAlphaPremultiplied, + int transparency, int transferType) + { + this(colorSpace, findBits(colorSpace, transferType, hasAlpha), hasAlpha, + isAlphaPremultiplied, transparency, transferType); + } + + public int getRed(int pixel) + { + if (getNumComponents()>1) throw new IllegalArgumentException(); + return (int) getRGBFloat(pixel)[0]; + } + + public int getGreen(int pixel) + { + if (getNumComponents()>1) throw new IllegalArgumentException(); + return (int) getRGBFloat(pixel)[0]; + } + + public int getBlue(int pixel) + { + if (getNumComponents()>1) throw new IllegalArgumentException(); + return (int) getRGBFloat(pixel)[0]; + } + + public int getAlpha(int pixel) + { + if (getNumComponents()>1) throw new IllegalArgumentException(); + int shift = 8 - getComponentSize(getNumColorComponents()); + if (shift >= 0) return pixel << shift; + return pixel >> (-shift); + } + + public int getRGB(int pixel) + { + float[] rgb = getRGBFloat(pixel); + int ret = getRGB(rgb); + if (hasAlpha()) ret |= getAlpha(pixel) << 24; + return ret; + } + + + /* Note, it's OK to pass a to large array to toRGB(). Extra + elements are ignored. */ + + private float[] getRGBFloat(int pixel) + { + float[] data = { pixel }; + return cspace.toRGB(data); + } + + private float[] getRGBFloat(Object inData) + { + DataBuffer buffer = + Buffers.createBufferFromData(transferType, inData, + getNumComponents()); + int colors = getNumColorComponents(); + float[] data = new float[colors]; + + // FIXME: unpremultiply data that is premultiplied + for (int i=0; i<colors; i++) + { + float maxValue = (1<<getComponentSize(i))-1; + data[i] = buffer.getElemFloat(i)/maxValue; + } + float[] rgb = cspace.toRGB(data); + return rgb; + } + + public int getRed(Object inData) + { + return (int) getRGBFloat(inData)[0]*255; + } + + public int getGreen(Object inData) + { + return (int) getRGBFloat(inData)[1]*255; + } + + public int getBlue(Object inData) + { + return (int) getRGBFloat(inData)[2]*255; + } + + public int getAlpha(Object inData) + { + DataBuffer buffer = + Buffers.createBufferFromData(transferType, inData, + getNumComponents()); + int shift = 8 - getComponentSize(getNumColorComponents()); + int alpha = buffer.getElem(getNumColorComponents()); + if (shift >= 0) return alpha << shift; + return alpha >> (-shift); + } + + private int getRGB(float[] rgb) + { + /* NOTE: We could cast to byte instead of int here. This would + avoid bits spilling over from one bit field to + another. But, if we assume that floats are in the [0.0, + 1.0] range, this will never happen anyway. */ + + /* Remember to multiply BEFORE casting to int, otherwise, decimal + point data will be lost. */ + int ret = + (((int) (rgb[0]*255F)) << 16) | + (((int) (rgb[1]*255F)) << 8) | + (((int) (rgb[2]*255F)) << 0); + return ret; + } + + /** + * @param inData pixel data of transferType, as returned by the + * getDataElements method in SampleModel. + */ + public int getRGB(Object inData) + { + float[] rgb = getRGBFloat(inData); + int ret = getRGB(rgb); + if (hasAlpha()) ret |= getAlpha(inData) << 24; + return ret; + } + + public Object getDataElements(int rgb, Object pixel) + { + // Convert rgb to [0.0, 1.0] sRGB values. + float[] rgbFloats = { + ((rgb >> 16)&0xff)/255.0F, + ((rgb >> 8)&0xff)/255.0F, + ((rgb >> 0)&0xff)/255.0F + }; + + // Convert from rgb to color space components. + float[] data = cspace.fromRGB(rgbFloats); + DataBuffer buffer = Buffers.createBuffer(transferType, pixel, + getNumComponents()); + int numColors = getNumColorComponents(); + + if (hasAlpha()) + { + float alpha = ((rgb >> 24)&0xff)/255.0F; + + /* If color model has alpha and should be premultiplied, multiply + color space components with alpha value. */ + if (isAlphaPremultiplied()) { + for (int i=0; i<numColors; i++) + data[i] *= alpha; + } + // Scale the alpha sample to the correct number of bits. + alpha *= (1<<(bits[numColors]-1)); + // Arrange the alpha sample in the output array. + buffer.setElemFloat(numColors, alpha); + } + for (int i=0; i<numColors; i++) + { + // Scale the color samples to the correct number of bits. + float value = data[i]*(1<<(bits[i]-1)); + // Arrange the color samples in the output array. + buffer.setElemFloat(i, value); + } + return Buffers.getData(buffer); + } + + public int[] getComponents(int pixel, int[] components, int offset) + { + if (getNumComponents()>1) throw new IllegalArgumentException(); + if (components == null) + components = new int[getNumComponents() + offset]; + components[offset] = pixel; + return components; + } + + public int[] getComponents(Object pixel, int[] components, int offset) + { + DataBuffer buffer = Buffers.createBuffer(transferType, pixel, + getNumComponents()); + int numComponents = getNumComponents(); + + if (components == null) + components = new int[numComponents + offset]; + + for (int i=0; i<numComponents; i++) + components[offset++] = buffer.getElem(i); + + return components; + } + + public int getDataElement(int[] components, int offset) + { + if (getNumComponents()>1) throw new IllegalArgumentException(); + return components[offset]; + } + + public Object getDataElements(int[] components, int offset, Object obj) + { + DataBuffer buffer = Buffers.createBuffer(transferType, obj, + getNumComponents()); + int numComponents = getNumComponents(); + + for (int i=0; i<numComponents; i++) + buffer.setElem(i, components[offset++]); + + return Buffers.getData(buffer); + } + + public 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 ComponentColorModel(cspace, hasAlpha, isAlphaPremultiplied, + transparency, transferType); + } + + public boolean isCompatibleRaster(Raster raster) + { + return super.isCompatibleRaster(raster); + // FIXME: Should we test something more here? (Why override?) + } + + public WritableRaster createCompatibleWritableRaster(int w, int h) + { + SampleModel sm = createCompatibleSampleModel(w, h); + Point origin = new Point(0, 0); + return Raster.createWritableRaster(sm, origin); + } + + + /** + * Creates a <code>SampleModel</code> whose arrangement of pixel + * data is compatible to this <code>ColorModel</code>. + * + * @param w the number of pixels in the horizontal direction. + * @param h the number of pixels in the vertical direction. + */ + public SampleModel createCompatibleSampleModel(int w, int h) + { + int pixelStride, scanlineStride; + int[] bandOffsets; + + pixelStride = getNumComponents(); + scanlineStride = pixelStride * w; + + /* We might be able to re-use the same bandOffsets array among + * multiple calls to this method. However, this optimization does + * not seem worthwile because setting up descriptive data + * structures (such as SampleModels) is neglectible in comparision + * to shuffling around masses of pixel data. + */ + bandOffsets = new int[pixelStride]; + for (int i = 0; i < pixelStride; i++) + bandOffsets[i] = i; + + /* FIXME: Think about whether it would make sense to return the + * possibly more efficient PixelInterleavedSampleModel for other + * transferTypes as well. It seems unlikely that this would break + * any user applications, so the Mauve tests on this method + * might be too restrictive. + */ + switch (transferType) + { + case DataBuffer.TYPE_BYTE: + case DataBuffer.TYPE_USHORT: + return new PixelInterleavedSampleModel(transferType, w, h, + pixelStride, + scanlineStride, + bandOffsets); + + default: + return new ComponentSampleModel(transferType, w, h, + pixelStride, + scanlineStride, + bandOffsets); + } + } + + + public boolean isCompatibleSampleModel(SampleModel sm) + { + return + (sm instanceof ComponentSampleModel) && + super.isCompatibleSampleModel(sm); + } + + 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 (!(obj instanceof ComponentColorModel)) return false; + return super.equals(obj); + } +} |