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427 lines
17 KiB
427 lines
17 KiB
/*
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* Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.swing.plaf.nimbus;
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import java.awt.AlphaComposite;
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import java.awt.Graphics2D;
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import java.awt.Transparency;
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import java.awt.GraphicsConfiguration;
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import java.awt.GraphicsEnvironment;
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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.awt.image.ColorModel;
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/**
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* EffectUtils
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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 EffectUtils {
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/**
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* Clear a transparent image to 100% transparent
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*
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* @param img The image to clear
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*/
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static void clearImage(BufferedImage img) {
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Graphics2D g2 = img.createGraphics();
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g2.setComposite(AlphaComposite.Clear);
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g2.fillRect(0, 0, img.getWidth(), img.getHeight());
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g2.dispose();
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}
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// =================================================================================================================
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// Blur
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/**
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* Apply Gaussian Blur to Image
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*
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* @param src The image tp
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* @param dst The destination image to draw blured src image into, null if you want a new one created
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* @param radius The blur kernel radius
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* @return The blured image
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*/
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static BufferedImage gaussianBlur(BufferedImage src, BufferedImage dst, int radius) {
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int width = src.getWidth();
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int height = src.getHeight();
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if (dst == null || dst.getWidth() != width || dst.getHeight() != height || src.getType() != dst.getType()) {
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dst = createColorModelCompatibleImage(src);
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}
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float[] kernel = createGaussianKernel(radius);
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if (src.getType() == BufferedImage.TYPE_INT_ARGB) {
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int[] srcPixels = new int[width * height];
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int[] dstPixels = new int[width * height];
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getPixels(src, 0, 0, width, height, srcPixels);
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// horizontal pass
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blur(srcPixels, dstPixels, width, height, kernel, radius);
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// vertical pass
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//noinspection SuspiciousNameCombination
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blur(dstPixels, srcPixels, height, width, kernel, radius);
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// the result is now stored in srcPixels due to the 2nd pass
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setPixels(dst, 0, 0, width, height, srcPixels);
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} else if (src.getType() == BufferedImage.TYPE_BYTE_GRAY) {
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byte[] srcPixels = new byte[width * height];
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byte[] dstPixels = new byte[width * height];
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getPixels(src, 0, 0, width, height, srcPixels);
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// horizontal pass
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blur(srcPixels, dstPixels, width, height, kernel, radius);
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// vertical pass
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//noinspection SuspiciousNameCombination
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blur(dstPixels, srcPixels, height, width, kernel, radius);
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// the result is now stored in srcPixels due to the 2nd pass
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setPixels(dst, 0, 0, width, height, srcPixels);
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} else {
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throw new IllegalArgumentException("EffectUtils.gaussianBlur() src image is not a supported type, type=[" +
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src.getType() + "]");
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}
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return dst;
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}
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/**
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* <p>Blurs the source pixels into the destination pixels. The force of the blur is specified by the radius which
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* must be greater than 0.</p> <p>The source and destination pixels arrays are expected to be in the INT_ARGB
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* format.</p> <p>After this method is executed, dstPixels contains a transposed and filtered copy of
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* srcPixels.</p>
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*
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* @param srcPixels the source pixels
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* @param dstPixels the destination pixels
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* @param width the width of the source picture
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* @param height the height of the source picture
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* @param kernel the kernel of the blur effect
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* @param radius the radius of the blur effect
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*/
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private static void blur(int[] srcPixels, int[] dstPixels,
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int width, int height,
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float[] kernel, int radius) {
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float a;
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float r;
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float g;
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float b;
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int ca;
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int cr;
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int cg;
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int cb;
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for (int y = 0; y < height; y++) {
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int index = y;
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int offset = y * width;
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for (int x = 0; x < width; x++) {
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a = r = g = b = 0.0f;
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for (int i = -radius; i <= radius; i++) {
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int subOffset = x + i;
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if (subOffset < 0 || subOffset >= width) {
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subOffset = (x + width) % width;
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}
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int pixel = srcPixels[offset + subOffset];
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float blurFactor = kernel[radius + i];
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a += blurFactor * ((pixel >> 24) & 0xFF);
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r += blurFactor * ((pixel >> 16) & 0xFF);
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g += blurFactor * ((pixel >> 8) & 0xFF);
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b += blurFactor * ((pixel) & 0xFF);
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}
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ca = (int) (a + 0.5f);
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cr = (int) (r + 0.5f);
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cg = (int) (g + 0.5f);
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cb = (int) (b + 0.5f);
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dstPixels[index] = ((ca > 255 ? 255 : ca) << 24) |
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((cr > 255 ? 255 : cr) << 16) |
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((cg > 255 ? 255 : cg) << 8) |
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(cb > 255 ? 255 : cb);
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index += height;
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}
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}
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}
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/**
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* <p>Blurs the source pixels into the destination pixels. The force of the blur is specified by the radius which
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* must be greater than 0.</p> <p>The source and destination pixels arrays are expected to be in the BYTE_GREY
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* format.</p> <p>After this method is executed, dstPixels contains a transposed and filtered copy of
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* srcPixels.</p>
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*
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* @param srcPixels the source pixels
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* @param dstPixels the destination pixels
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* @param width the width of the source picture
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* @param height the height of the source picture
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* @param kernel the kernel of the blur effect
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* @param radius the radius of the blur effect
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*/
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static void blur(byte[] srcPixels, byte[] dstPixels,
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int width, int height,
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float[] kernel, int radius) {
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float p;
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int cp;
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for (int y = 0; y < height; y++) {
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int index = y;
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int offset = y * width;
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for (int x = 0; x < width; x++) {
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p = 0.0f;
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for (int i = -radius; i <= radius; i++) {
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int subOffset = x + i;
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// if (subOffset < 0) subOffset = 0;
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// if (subOffset >= width) subOffset = width-1;
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if (subOffset < 0 || subOffset >= width) {
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subOffset = (x + width) % width;
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}
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int pixel = srcPixels[offset + subOffset] & 0xFF;
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float blurFactor = kernel[radius + i];
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p += blurFactor * pixel;
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}
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cp = (int) (p + 0.5f);
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dstPixels[index] = (byte) (cp > 255 ? 255 : cp);
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index += height;
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}
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}
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}
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static float[] createGaussianKernel(int radius) {
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if (radius < 1) {
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throw new IllegalArgumentException("Radius must be >= 1");
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}
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float[] data = new float[radius * 2 + 1];
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float sigma = radius / 3.0f;
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float twoSigmaSquare = 2.0f * sigma * sigma;
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float sigmaRoot = (float) Math.sqrt(twoSigmaSquare * Math.PI);
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float total = 0.0f;
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for (int i = -radius; i <= radius; i++) {
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float distance = i * i;
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int index = i + radius;
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data[index] = (float) Math.exp(-distance / twoSigmaSquare) / sigmaRoot;
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total += data[index];
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}
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for (int i = 0; i < data.length; i++) {
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data[i] /= total;
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}
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return data;
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}
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// =================================================================================================================
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// Get/Set Pixels helper methods
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/**
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* <p>Returns an array of pixels, stored as integers, from a <code>BufferedImage</code>. The pixels are grabbed from
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* a rectangular area defined by a location and two dimensions. Calling this method on an image of type different
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* from <code>BufferedImage.TYPE_INT_ARGB</code> and <code>BufferedImage.TYPE_INT_RGB</code> will unmanage the
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* image.</p>
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*
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* @param img the source image
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* @param x the x location at which to start grabbing pixels
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* @param y the y location at which to start grabbing pixels
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* @param w the width of the rectangle of pixels to grab
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* @param h the height of the rectangle of pixels to grab
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* @param pixels a pre-allocated array of pixels of size w*h; can be null
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* @return <code>pixels</code> if non-null, a new array of integers otherwise
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* @throws IllegalArgumentException is <code>pixels</code> is non-null and of length < w*h
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*/
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static byte[] getPixels(BufferedImage img,
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int x, int y, int w, int h, byte[] pixels) {
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if (w == 0 || h == 0) {
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return new byte[0];
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}
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if (pixels == null) {
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pixels = new byte[w * h];
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} else if (pixels.length < w * h) {
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throw new IllegalArgumentException("pixels array must have a length >= w*h");
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}
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int imageType = img.getType();
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if (imageType == BufferedImage.TYPE_BYTE_GRAY) {
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Raster raster = img.getRaster();
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return (byte[]) raster.getDataElements(x, y, w, h, pixels);
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} else {
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throw new IllegalArgumentException("Only type BYTE_GRAY is supported");
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}
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}
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/**
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* <p>Writes a rectangular area of pixels in the destination <code>BufferedImage</code>. Calling this method on an
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* image of type different from <code>BufferedImage.TYPE_INT_ARGB</code> and <code>BufferedImage.TYPE_INT_RGB</code>
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* will unmanage the image.</p>
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*
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* @param img the destination image
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* @param x the x location at which to start storing pixels
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* @param y the y location at which to start storing pixels
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* @param w the width of the rectangle of pixels to store
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* @param h the height of the rectangle of pixels to store
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* @param pixels an array of pixels, stored as integers
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* @throws IllegalArgumentException is <code>pixels</code> is non-null and of length < w*h
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*/
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static void setPixels(BufferedImage img,
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int x, int y, int w, int h, byte[] pixels) {
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if (pixels == null || w == 0 || h == 0) {
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return;
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} else if (pixels.length < w * h) {
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throw new IllegalArgumentException("pixels array must have a length >= w*h");
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}
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int imageType = img.getType();
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if (imageType == BufferedImage.TYPE_BYTE_GRAY) {
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WritableRaster raster = img.getRaster();
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raster.setDataElements(x, y, w, h, pixels);
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} else {
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throw new IllegalArgumentException("Only type BYTE_GRAY is supported");
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}
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}
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/**
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* <p>Returns an array of pixels, stored as integers, from a
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* <code>BufferedImage</code>. The pixels are grabbed from a rectangular
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* area defined by a location and two dimensions. Calling this method on
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* an image of type different from <code>BufferedImage.TYPE_INT_ARGB</code>
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* and <code>BufferedImage.TYPE_INT_RGB</code> will unmanage the image.</p>
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*
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* @param img the source image
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* @param x the x location at which to start grabbing pixels
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* @param y the y location at which to start grabbing pixels
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* @param w the width of the rectangle of pixels to grab
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* @param h the height of the rectangle of pixels to grab
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* @param pixels a pre-allocated array of pixels of size w*h; can be null
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* @return <code>pixels</code> if non-null, a new array of integers
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* otherwise
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* @throws IllegalArgumentException is <code>pixels</code> is non-null and
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* of length < w*h
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*/
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public static int[] getPixels(BufferedImage img,
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int x, int y, int w, int h, int[] pixels) {
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if (w == 0 || h == 0) {
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return new int[0];
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}
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if (pixels == null) {
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pixels = new int[w * h];
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} else if (pixels.length < w * h) {
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throw new IllegalArgumentException("pixels array must have a length" +
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" >= w*h");
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}
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int imageType = img.getType();
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if (imageType == BufferedImage.TYPE_INT_ARGB ||
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imageType == BufferedImage.TYPE_INT_RGB) {
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Raster raster = img.getRaster();
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return (int[]) raster.getDataElements(x, y, w, h, pixels);
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}
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// Unmanages the image
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return img.getRGB(x, y, w, h, pixels, 0, w);
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}
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/**
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* <p>Writes a rectangular area of pixels in the destination
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* <code>BufferedImage</code>. Calling this method on
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* an image of type different from <code>BufferedImage.TYPE_INT_ARGB</code>
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* and <code>BufferedImage.TYPE_INT_RGB</code> will unmanage the image.</p>
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*
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* @param img the destination image
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* @param x the x location at which to start storing pixels
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* @param y the y location at which to start storing pixels
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* @param w the width of the rectangle of pixels to store
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* @param h the height of the rectangle of pixels to store
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* @param pixels an array of pixels, stored as integers
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* @throws IllegalArgumentException is <code>pixels</code> is non-null and
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* of length < w*h
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*/
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public static void setPixels(BufferedImage img,
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int x, int y, int w, int h, int[] pixels) {
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if (pixels == null || w == 0 || h == 0) {
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return;
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} else if (pixels.length < w * h) {
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throw new IllegalArgumentException("pixels array must have a length" +
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" >= w*h");
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}
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int imageType = img.getType();
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if (imageType == BufferedImage.TYPE_INT_ARGB ||
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imageType == BufferedImage.TYPE_INT_RGB) {
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WritableRaster raster = img.getRaster();
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raster.setDataElements(x, y, w, h, pixels);
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} else {
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// Unmanages the image
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img.setRGB(x, y, w, h, pixels, 0, w);
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}
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}
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/**
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* <p>Returns a new <code>BufferedImage</code> using the same color model
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* as the image passed as a parameter. The returned image is only compatible
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* with the image passed as a parameter. This does not mean the returned
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* image is compatible with the hardware.</p>
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*
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* @param image the reference image from which the color model of the new
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* image is obtained
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* @return a new <code>BufferedImage</code>, compatible with the color model
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* of <code>image</code>
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*/
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public static BufferedImage createColorModelCompatibleImage(BufferedImage image) {
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ColorModel cm = image.getColorModel();
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return new BufferedImage(cm,
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cm.createCompatibleWritableRaster(image.getWidth(),
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image.getHeight()),
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cm.isAlphaPremultiplied(), null);
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}
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/**
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* <p>Returns a new translucent compatible image of the specified width and
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* height. That is, the returned <code>BufferedImage</code> is compatible with
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* the graphics hardware. If the method is called in a headless
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* environment, then the returned BufferedImage will be compatible with
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* the source image.</p>
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*
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* @param width the width of the new image
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* @param height the height of the new image
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* @return a new translucent compatible <code>BufferedImage</code> of the
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* specified width and height
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*/
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public static BufferedImage createCompatibleTranslucentImage(int width,
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int height) {
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return isHeadless() ?
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new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB) :
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getGraphicsConfiguration().createCompatibleImage(width, height,
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Transparency.TRANSLUCENT);
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}
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private static boolean isHeadless() {
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return GraphicsEnvironment.isHeadless();
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}
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// Returns the graphics configuration for the primary screen
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private static GraphicsConfiguration getGraphicsConfiguration() {
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return GraphicsEnvironment.getLocalGraphicsEnvironment().
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getDefaultScreenDevice().getDefaultConfiguration();
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}
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}
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