/* * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */package javax.swing.plaf.nimbus; import java.awt.image.BufferedImage;import java.awt.image.Raster;import java.awt.image.WritableRaster;import java.util.Arrays; /** * DropShadowEffect - This effect currently only works with ARGB type buffered * images. * * @author Created by Jasper Potts (Jun 18, 2007) */class DropShadowEffect extends ShadowEffect {     // =================================================================================================================    // Effect Methods     /**     * Get the type of this effect, one of UNDER,BLENDED,OVER. UNDER means the result of apply effect should be painted     * under the src image. BLENDED means the result of apply sffect contains a modified src image so just it should be     * painted. OVER means the result of apply effect should be painted over the src image.     *     * @return The effect type     */    @Override    EffectType getEffectType() {        return EffectType.UNDER;    }     /**     * Apply the effect to the src image generating the result . The result image may or may not contain the source     * image depending on what the effect type is.     *     * @param src The source image for applying the effect to     * @param dst The destination image to paint effect result into. If this is null then a new image will be created     * @param w   The width of the src image to apply effect to, this allow the src and dst buffers to be bigger than     *            the area the need effect applied to it     * @param h   The height of the src image to apply effect to, this allow the src and dst buffers to be bigger than     *            the area the need effect applied to it     * @return Image with the result of the effect     */    @Override    BufferedImage applyEffect(BufferedImage src, BufferedImage dst, int w, int h) {        if (src == null || src.getType() != BufferedImage.TYPE_INT_ARGB){            throw new IllegalArgumentException("Effect only works with " +                    "source images of type BufferedImage.TYPE_INT_ARGB.");        }        if (dst != null && dst.getType() != BufferedImage.TYPE_INT_ARGB){            throw new IllegalArgumentException("Effect only works with " +                    "destination images of type BufferedImage.TYPE_INT_ARGB.");        }        // calculate offset        double trangleAngle = Math.toRadians(angle - 90);        int offsetX = (int) (Math.sin(trangleAngle) * distance);        int offsetY = (int) (Math.cos(trangleAngle) * distance);        // clac expanded size        int tmpOffX = offsetX + size;        int tmpOffY = offsetX + size;        int tmpW = w + offsetX + size + size;        int tmpH = h + offsetX + size;        // create tmp buffers        int[] lineBuf = getArrayCache().getTmpIntArray(w);        byte[] tmpBuf1 = getArrayCache().getTmpByteArray1(tmpW * tmpH);        Arrays.fill(tmpBuf1, (byte) 0x00);        byte[] tmpBuf2 = getArrayCache().getTmpByteArray2(tmpW * tmpH);        // extract src image alpha channel and inverse and offset        Raster srcRaster = src.getRaster();        for (int y = 0; y < h; y++) {            int dy = (y + tmpOffY);            int offset = dy * tmpW;            srcRaster.getDataElements(0, y, w, 1, lineBuf);            for (int x = 0; x < w; x++) {                int dx = x + tmpOffX;                tmpBuf1[offset + dx] = (byte) ((lineBuf[x] & 0xFF000000) >>> 24);            }        }        // blur        float[] kernel = EffectUtils.createGaussianKernel(size);        EffectUtils.blur(tmpBuf1, tmpBuf2, tmpW, tmpH, kernel, size); // horizontal pass        EffectUtils.blur(tmpBuf2, tmpBuf1, tmpH, tmpW, kernel, size);// vertical pass        //rescale        float spread = Math.min(1 / (1 - (0.01f * this.spread)), 255);        for (int i = 0; i < tmpBuf1.length; i++) {            int val = (int) (((int) tmpBuf1[i] & 0xFF) * spread);            tmpBuf1[i] = (val > 255) ? (byte) 0xFF : (byte) val;        }        // create color image with shadow color and greyscale image as alpha        if (dst == null) dst = new BufferedImage(w, h,                BufferedImage.TYPE_INT_ARGB);        WritableRaster shadowRaster = dst.getRaster();        int red = color.getRed(), green = color.getGreen(), blue = color.getBlue();        for (int y = 0; y < h; y++) {            int srcY = y + tmpOffY;            int shadowOffset = (srcY - offsetY) * tmpW;            for (int x = 0; x < w; x++) {                int srcX = x + tmpOffX;                lineBuf[x] = tmpBuf1[shadowOffset + (srcX - offsetX)] << 24 | red << 16 | green << 8 | blue;            }            shadowRaster.setDataElements(0, y, w, 1, lineBuf);        }        return dst;    }}