/*
* 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.
*
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package javax.swing.plaf.nimbus;
import java.awt.image.BufferedImage;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.util.Arrays;
/**
* InnerShadowEffect - This effect currently only works with ARGB type buffered
* images.
*
* @author Created by Jasper Potts (Jun 18, 2007)
*/
class InnerShadowEffect 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
*/
Effect.EffectType getEffectType() {
return Effect.EffectType.OVER;
}
/**
* 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 dstination 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
*/
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[] srcAlphaBuf = getArrayCache().getTmpByteArray1(tmpW * tmpH);
Arrays.fill(srcAlphaBuf, (byte) 0xFF);
byte[] tmpBuf1 = getArrayCache().getTmpByteArray2(tmpW * tmpH);
byte[] tmpBuf2 = getArrayCache().getTmpByteArray3(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;
srcAlphaBuf[offset + dx] = (byte) ((255 - ((lineBuf[x] & 0xFF000000) >>> 24)) & 0xFF);
}
}
// blur
float[] kernel = EffectUtils.createGaussianKernel(size * 2);
EffectUtils.blur(srcAlphaBuf, tmpBuf2, tmpW, tmpH, kernel, size * 2); // horizontal pass
EffectUtils.blur(tmpBuf2, tmpBuf1, tmpH, tmpW, kernel, size * 2);// 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 offset = srcY * tmpW;
int shadowOffset = (srcY - offsetY) * tmpW;
for (int x = 0; x < w; x++) {
int srcX = x + tmpOffX;
int origianlAlphaVal = 255 - ((int) srcAlphaBuf[offset + srcX] & 0xFF);
int shadowVal = (int) tmpBuf1[shadowOffset + (srcX - offsetX)] & 0xFF;
int alphaVal = Math.min(origianlAlphaVal, shadowVal);
lineBuf[x] = ((byte) alphaVal & 0xFF) << 24 | red << 16 | green << 8 | blue;
}
shadowRaster.setDataElements(0, y, w, 1, lineBuf);
}
return dst;
}
}