1 /* 2 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 package javax.swing.plaf.nimbus; 26 27 import java.awt.image.BufferedImage; 28 import java.awt.image.Raster; 29 import java.awt.image.WritableRaster; 30 import java.util.Arrays; 31 32 /** 33 * DropShadowEffect - This effect currently only works with ARGB type buffered 34 * images. 35 * 36 * @author Created by Jasper Potts (Jun 18, 2007) 37 */ 38 class DropShadowEffect extends ShadowEffect { 39 40 // ================================================================================================================= 41 // Effect Methods 42 43 /** 44 * Get the type of this effect, one of UNDER,BLENDED,OVER. UNDER means the result of apply effect should be painted 45 * under the src image. BLENDED means the result of apply sffect contains a modified src image so just it should be 46 * painted. OVER means the result of apply effect should be painted over the src image. 47 * 48 * @return The effect type 49 */ 50 @Override getEffectType()51 EffectType getEffectType() { 52 return EffectType.UNDER; 53 } 54 55 /** 56 * Apply the effect to the src image generating the result . The result image may or may not contain the source 57 * image depending on what the effect type is. 58 * 59 * @param src The source image for applying the effect to 60 * @param dst The destination image to paint effect result into. If this is null then a new image will be created 61 * @param w The width of the src image to apply effect to, this allow the src and dst buffers to be bigger than 62 * the area the need effect applied to it 63 * @param h The height of the src image to apply effect to, this allow the src and dst buffers to be bigger than 64 * the area the need effect applied to it 65 * @return Image with the result of the effect 66 */ 67 @Override applyEffect(BufferedImage src, BufferedImage dst, int w, int h)68 BufferedImage applyEffect(BufferedImage src, BufferedImage dst, int w, int h) { 69 if (src == null || src.getType() != BufferedImage.TYPE_INT_ARGB){ 70 throw new IllegalArgumentException("Effect only works with " + 71 "source images of type BufferedImage.TYPE_INT_ARGB."); 72 } 73 if (dst != null && dst.getType() != BufferedImage.TYPE_INT_ARGB){ 74 throw new IllegalArgumentException("Effect only works with " + 75 "destination images of type BufferedImage.TYPE_INT_ARGB."); 76 } 77 // calculate offset 78 double trangleAngle = Math.toRadians(angle - 90); 79 int offsetX = (int) (Math.sin(trangleAngle) * distance); 80 int offsetY = (int) (Math.cos(trangleAngle) * distance); 81 // clac expanded size 82 int tmpOffX = offsetX + size; 83 int tmpOffY = offsetX + size; 84 int tmpW = w + offsetX + size + size; 85 int tmpH = h + offsetX + size; 86 // create tmp buffers 87 int[] lineBuf = getArrayCache().getTmpIntArray(w); 88 byte[] tmpBuf1 = getArrayCache().getTmpByteArray1(tmpW * tmpH); 89 Arrays.fill(tmpBuf1, (byte) 0x00); 90 byte[] tmpBuf2 = getArrayCache().getTmpByteArray2(tmpW * tmpH); 91 // extract src image alpha channel and inverse and offset 92 Raster srcRaster = src.getRaster(); 93 for (int y = 0; y < h; y++) { 94 int dy = (y + tmpOffY); 95 int offset = dy * tmpW; 96 srcRaster.getDataElements(0, y, w, 1, lineBuf); 97 for (int x = 0; x < w; x++) { 98 int dx = x + tmpOffX; 99 tmpBuf1[offset + dx] = (byte) ((lineBuf[x] & 0xFF000000) >>> 24); 100 } 101 } 102 // blur 103 float[] kernel = EffectUtils.createGaussianKernel(size); 104 EffectUtils.blur(tmpBuf1, tmpBuf2, tmpW, tmpH, kernel, size); // horizontal pass 105 EffectUtils.blur(tmpBuf2, tmpBuf1, tmpH, tmpW, kernel, size);// vertical pass 106 //rescale 107 float spread = Math.min(1 / (1 - (0.01f * this.spread)), 255); 108 for (int i = 0; i < tmpBuf1.length; i++) { 109 int val = (int) (((int) tmpBuf1[i] & 0xFF) * spread); 110 tmpBuf1[i] = (val > 255) ? (byte) 0xFF : (byte) val; 111 } 112 // create color image with shadow color and greyscale image as alpha 113 if (dst == null) dst = new BufferedImage(w, h, 114 BufferedImage.TYPE_INT_ARGB); 115 WritableRaster shadowRaster = dst.getRaster(); 116 int red = color.getRed(), green = color.getGreen(), blue = color.getBlue(); 117 for (int y = 0; y < h; y++) { 118 int srcY = y + tmpOffY; 119 int shadowOffset = (srcY - offsetY) * tmpW; 120 for (int x = 0; x < w; x++) { 121 int srcX = x + tmpOffX; 122 lineBuf[x] = tmpBuf1[shadowOffset + (srcX - offsetX)] << 24 | red << 16 | green << 8 | blue; 123 } 124 shadowRaster.setDataElements(0, y, w, 1, lineBuf); 125 } 126 return dst; 127 } 128 } 129