diff options
Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/java/awt/java2d/AlphaCompositeContext.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/java/awt/java2d/AlphaCompositeContext.java | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/awt/java2d/AlphaCompositeContext.java b/gcc-4.4.3/libjava/classpath/gnu/java/awt/java2d/AlphaCompositeContext.java new file mode 100644 index 000000000..2e3690d83 --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/java/awt/java2d/AlphaCompositeContext.java @@ -0,0 +1,316 @@ +/* AlphaCompositeContext.java -- CompositeContext impl for AlphaComposite + Copyright (C) 2006 Free Software Foundation, Inc. + +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 gnu.java.awt.java2d; + +import java.awt.AWTError; +import java.awt.AlphaComposite; +import java.awt.CompositeContext; +import java.awt.image.ColorModel; +import java.awt.image.Raster; +import java.awt.image.WritableRaster; + +/** + * A CompositeContext implementation for {@link AlphaComposite}. + * + * @author Roman Kennke (kennke@aicas.com) + */ +public class AlphaCompositeContext + implements CompositeContext +{ + + /** + * The Composite object for which we perform compositing. + */ + private AlphaComposite composite; + + /** + * The source color model. + */ + private ColorModel srcColorModel; + + /** + * The destination color model. + */ + private ColorModel dstColorModel; + + /** + * The blending factor for the source. + */ + private float fs; + + /** + * The blending factor for the destination. + */ + private float fd; + + /** + * Creates a new AlphaCompositeContext. + * + * @param aComp the AlphaComposite object + * @param srcCM the source color model + * @param dstCM the destination color model + */ + public AlphaCompositeContext(AlphaComposite aComp, ColorModel srcCM, + ColorModel dstCM) + { + composite = aComp; + srcColorModel = srcCM; + dstColorModel = dstCM; + + + // Determine the blending factors according to the rule in the + // AlphaComposite. For some rules the factors must be determined + // dynamically because they depend on the actual pixel value. + switch (composite.getRule()) + { + case AlphaComposite.CLEAR: + fs = 0.F; + fd= 0.F; + break; + case AlphaComposite.DST: + fs = 0.F; + fd= 1.F; + break; + case AlphaComposite.DST_ATOP: + fs = 1.F; // Determined later as 1 - alpha_dst; + fd = 1.F; // Determined later as alpha_src; + break; + case AlphaComposite.DST_IN: + fs = 0.F; + fd = 0.F; // Determined later as alpha_src; + break; + case AlphaComposite.DST_OUT: + fs = 0.F; + fd = 0.F; // Determined later as 1 - alpha_src; + break; + case AlphaComposite.DST_OVER: + fs = 1.F; // Determined later as 1 - alpha_dst. + fd= 1.F; + break; + case AlphaComposite.SRC: + fs = 1.F; + fd= 0.F; + break; + case AlphaComposite.SRC_ATOP: + fs = 1.F; // Determined later as alpha_dst; + fd = 1.F; // Determined later as 1 - alpha_src; + break; + case AlphaComposite.SRC_IN: + fs = 0.F; // Determined later as alpha_dst; + fd = 0.F; + break; + case AlphaComposite.SRC_OUT: + fs = 0.F; // Determined later as 1 - alpha_dst; + fd = 0.F; + break; + case AlphaComposite.SRC_OVER: + fs = 1.F; + fd= 1.F; // Determined later as 1 - alpha_src. + break; + case AlphaComposite.XOR: + fs = 1.F; // Determined later as 1 - alpha_dst. + fd= 1.F; // Determined later as 1 - alpha_src. + break; + default: + throw new AWTError("Illegal AlphaComposite rule"); + } + + } + + /** + * Releases all resources held by this composite object. + */ + public void dispose() + { + // Nothing to do here yet. + } + + /** + * Performs compositing according to the rules specified in the + * AlphaComposite from the constructor. + */ + public void compose(Raster src, Raster dstIn, WritableRaster dstOut) + { + + // TODO: This implementation is very general and highly inefficient. There + // are two possible ways to optimize this: + // 1. Special cased implementations for common ColorModels and transfer + // types. + // 2. Native implementation. + + int x0 = src.getMinX(); + int y0 = src.getMinY(); + int width = src.getWidth(); + int height = src.getHeight(); + int x1 = x0 + width; + int y1 = y0 + height; + + Object srcPixel = null; + Object dstPixel = null; + + // Prepare the array that holds the color and alpha components of the + // source pixels. + float[] srcComponents; + int srcComponentsLength = srcColorModel.getNumComponents(); + if (! srcColorModel.hasAlpha()) + srcComponentsLength += 1; + srcComponents = new float[srcComponentsLength]; + + // Prepare the array that holds the color and alpha components of the + // destination pixels. + float[] dstComponents; + int dstComponentsLength = dstColorModel.getNumComponents(); + if (! dstColorModel.hasAlpha()) + dstComponentsLength += 1; + dstComponents = new float[dstComponentsLength]; + + if (srcComponentsLength != dstComponentsLength) + throw new AWTError("The color models of the source and destination have" + + "incompatible number of color components"); + + int srcTransferType = srcColorModel.getTransferType(); + int dstTransferType = dstColorModel.getTransferType(); + + for (int y = y0; y < y1; y++) + { + for (int x = x0; x < x1; x++) + { + // Fetch source pixel. + srcPixel = src.getDataElements(x, y, (int[]) srcPixel); + // Fetch destination pixel. + dstPixel = dstIn.getDataElements(x, y, dstPixel); + // Get normalized components. This is the only type that is + // guaranteed to be supported by all ColorModels. + srcComponents = + srcColorModel.getNormalizedComponents(srcPixel, srcComponents, 0); + if (! srcColorModel.hasAlpha()) + srcComponents[srcComponentsLength - 1] = 1.0F; + dstComponents = + dstColorModel.getNormalizedComponents(dstPixel, dstComponents, 0); + if (! dstColorModel.hasAlpha()) + dstComponents[dstComponentsLength - 1] = 1.0F; + + // Prepare the input. + float compositeAlpha = composite.getAlpha(); + srcComponents[srcComponentsLength - 1] *= compositeAlpha; + if (srcColorModel.isAlphaPremultiplied()) + { + for (int i = srcComponentsLength - 2; i >= 0; i--) + srcComponents[i] *= compositeAlpha; + } + else + { + for (int i = srcComponentsLength - 2; i >= 0; i--) + srcComponents[i] *= srcComponents[srcComponentsLength - 1]; + } + if (! dstColorModel.isAlphaPremultiplied()) + { + for (int i = dstComponentsLength - 2; i >= 0; i--) + dstComponents[i] *= dstComponents[dstComponents.length - 1]; + } + + // Determine the blending factors according to the rule in the + // AlphaComposite. For some rules the factors must be determined + // dynamically because they depend on the actual pixel value. + float srcAlpha = srcComponents[srcComponentsLength - 1]; + float dstAlpha = dstComponents[dstComponentsLength - 1]; + switch (composite.getRule()) + { + case AlphaComposite.DST_ATOP: + fs = 1.F - dstAlpha; + fd = srcAlpha; + break; + case AlphaComposite.DST_IN: + fd = srcAlpha; + break; + case AlphaComposite.DST_OUT: + fd = 1.F - srcAlpha; + break; + case AlphaComposite.DST_OVER: + fs = 1.F - dstAlpha; + break; + case AlphaComposite.SRC_ATOP: + fs = srcAlpha; + fd = 1.F - srcAlpha; + break; + case AlphaComposite.SRC_IN: + fs = dstAlpha; + break; + case AlphaComposite.SRC_OUT: + fs = 1.F - dstAlpha; + break; + case AlphaComposite.SRC_OVER: + fd= 1.F - srcAlpha; + break; + case AlphaComposite.XOR: + fs = 1.F - dstAlpha; + fd= 1.F - srcAlpha; + break; + default: + // For the other cases the factors have already been determined + // in the constructor. + } + + // Apply the blending equation to the pixels. + for (int i = 0; i < srcComponentsLength; i++) + { + dstComponents[i] = srcComponents[i] * fs + + dstComponents[i] * fd; + } + + // Convert the result back when the destination is not + // alpha-premultiplied. + dstAlpha = dstComponents[dstComponentsLength - 1]; + if (!dstColorModel.isAlphaPremultiplied() && dstAlpha != 0.F) + { + for (int i = 0; i < dstComponentsLength - 1; i++) + { + dstComponents[i] = dstComponents[i] / dstAlpha; + } + } + + // Store the result in the destination raster. + dstPixel = dstColorModel.getDataElements(dstComponents, 0, + dstPixel); + dstOut.setDataElements(x, y, dstPixel); + } // End X loop. + } // End Y loop. + } + +} |