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/*
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* Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package javax.swing.plaf.nimbus;
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import java.awt.image.BufferedImage;
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import java.awt.image.Raster;
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import java.awt.image.WritableRaster;
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import java.util.Arrays;
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/**
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* InnerShadowEffect - This effect currently only works with ARGB type buffered
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* images.
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*
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* @author Created by Jasper Potts (Jun 18, 2007)
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*/
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class InnerShadowEffect extends ShadowEffect {
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// =================================================================================================================
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// Effect Methods
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/**
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* Get the type of this effect, one of UNDER,BLENDED,OVER. UNDER means the result of apply effect should be painted
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* under the src image. BLENDED means the result of apply sffect contains a modified src image so just it should be
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* painted. OVER means the result of apply effect should be painted over the src image.
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*
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* @return The effect type
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*/
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Effect.EffectType getEffectType() {
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return Effect.EffectType.OVER;
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}
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/**
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* Apply the effect to the src image generating the result . The result image may or may not contain the source
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* image depending on what the effect type is.
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*
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* @param src The source image for applying the effect to
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* @param dst The dstination image to paint effect result into. If this is null then a new image will be created
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* @param w The width of the src image to apply effect to, this allow the src and dst buffers to be bigger than
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* the area the need effect applied to it
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* @param h The height of the src image to apply effect to, this allow the src and dst buffers to be bigger than
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* the area the need effect applied to it
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* @return Image with the result of the effect
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*/
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BufferedImage applyEffect(BufferedImage src, BufferedImage dst, int w, int h) {
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if (src == null || src.getType() != BufferedImage.TYPE_INT_ARGB){
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throw new IllegalArgumentException("Effect only works with " +
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"source images of type BufferedImage.TYPE_INT_ARGB.");
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}
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if (dst != null && dst.getType() != BufferedImage.TYPE_INT_ARGB){
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throw new IllegalArgumentException("Effect only works with " +
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"destination images of type BufferedImage.TYPE_INT_ARGB.");
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}
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// calculate offset
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double trangleAngle = Math.toRadians(angle - 90);
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int offsetX = (int) (Math.sin(trangleAngle) * distance);
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int offsetY = (int) (Math.cos(trangleAngle) * distance);
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// clac expanded size
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int tmpOffX = offsetX + size;
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int tmpOffY = offsetX + size;
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int tmpW = w + offsetX + size + size;
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int tmpH = h + offsetX + size;
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// create tmp buffers
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int[] lineBuf = getArrayCache().getTmpIntArray(w);
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byte[] srcAlphaBuf = getArrayCache().getTmpByteArray1(tmpW * tmpH);
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Arrays.fill(srcAlphaBuf, (byte) 0xFF);
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byte[] tmpBuf1 = getArrayCache().getTmpByteArray2(tmpW * tmpH);
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byte[] tmpBuf2 = getArrayCache().getTmpByteArray3(tmpW * tmpH);
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// extract src image alpha channel and inverse and offset
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Raster srcRaster = src.getRaster();
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for (int y = 0; y < h; y++) {
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int dy = (y + tmpOffY);
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int offset = dy * tmpW;
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srcRaster.getDataElements(0, y, w, 1, lineBuf);
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for (int x = 0; x < w; x++) {
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int dx = x + tmpOffX;
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srcAlphaBuf[offset + dx] = (byte) ((255 - ((lineBuf[x] & 0xFF000000) >>> 24)) & 0xFF);
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}
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}
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// blur
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float[] kernel = EffectUtils.createGaussianKernel(size * 2);
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EffectUtils.blur(srcAlphaBuf, tmpBuf2, tmpW, tmpH, kernel, size * 2); // horizontal pass
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EffectUtils.blur(tmpBuf2, tmpBuf1, tmpH, tmpW, kernel, size * 2);// vertical pass
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//rescale
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float spread = Math.min(1 / (1 - (0.01f * this.spread)), 255);
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for (int i = 0; i < tmpBuf1.length; i++) {
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int val = (int) (((int) tmpBuf1[i] & 0xFF) * spread);
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tmpBuf1[i] = (val > 255) ? (byte) 0xFF : (byte) val;
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}
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// create color image with shadow color and greyscale image as alpha
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if (dst == null) dst = new BufferedImage(w, h,
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BufferedImage.TYPE_INT_ARGB);
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WritableRaster shadowRaster = dst.getRaster();
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int red = color.getRed(), green = color.getGreen(), blue = color.getBlue();
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for (int y = 0; y < h; y++) {
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int srcY = y + tmpOffY;
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int offset = srcY * tmpW;
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int shadowOffset = (srcY - offsetY) * tmpW;
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for (int x = 0; x < w; x++) {
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int srcX = x + tmpOffX;
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int origianlAlphaVal = 255 - ((int) srcAlphaBuf[offset + srcX] & 0xFF);
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int shadowVal = (int) tmpBuf1[shadowOffset + (srcX - offsetX)] & 0xFF;
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int alphaVal = Math.min(origianlAlphaVal, shadowVal);
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lineBuf[x] = ((byte) alphaVal & 0xFF) << 24 | red << 16 | green << 8 | blue;
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}
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shadowRaster.setDataElements(0, y, w, 1, lineBuf);
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}
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return dst;
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}
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}
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