/* * 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.AlphaComposite;import java.awt.Graphics2D;import java.awt.Transparency;import java.awt.GraphicsConfiguration;import java.awt.GraphicsEnvironment;import java.awt.image.BufferedImage;import java.awt.image.Raster;import java.awt.image.WritableRaster;import java.awt.image.ColorModel; /** * EffectUtils * * @author Created by Jasper Potts (Jun 18, 2007) */class EffectUtils {     /**     * Clear a transparent image to 100% transparent     *     * @param img The image to clear     */    static void clearImage(BufferedImage img) {        Graphics2D g2 = img.createGraphics();        g2.setComposite(AlphaComposite.Clear);        g2.fillRect(0, 0, img.getWidth(), img.getHeight());        g2.dispose();    }     // =================================================================================================================    // Blur     /**     * Apply Gaussian Blur to Image     *     * @param src    The image tp     * @param dst    The destination image to draw blured src image into, null if you want a new one created     * @param radius The blur kernel radius     * @return The blured image     */    static BufferedImage gaussianBlur(BufferedImage src, BufferedImage dst, int radius) {        int width = src.getWidth();        int height = src.getHeight();        if (dst == null || dst.getWidth() != width || dst.getHeight() != height || src.getType() != dst.getType()) {            dst = createColorModelCompatibleImage(src);        }        float[] kernel = createGaussianKernel(radius);        if (src.getType() == BufferedImage.TYPE_INT_ARGB) {            int[] srcPixels = new int[width * height];            int[] dstPixels = new int[width * height];            getPixels(src, 0, 0, width, height, srcPixels);            // horizontal pass            blur(srcPixels, dstPixels, width, height, kernel, radius);            // vertical pass            //noinspection SuspiciousNameCombination            blur(dstPixels, srcPixels, height, width, kernel, radius);            // the result is now stored in srcPixels due to the 2nd pass            setPixels(dst, 0, 0, width, height, srcPixels);        } else if (src.getType() == BufferedImage.TYPE_BYTE_GRAY) {            byte[] srcPixels = new byte[width * height];            byte[] dstPixels = new byte[width * height];            getPixels(src, 0, 0, width, height, srcPixels);            // horizontal pass            blur(srcPixels, dstPixels, width, height, kernel, radius);            // vertical pass            //noinspection SuspiciousNameCombination            blur(dstPixels, srcPixels, height, width, kernel, radius);            // the result is now stored in srcPixels due to the 2nd pass            setPixels(dst, 0, 0, width, height, srcPixels);        } else {            throw new IllegalArgumentException("EffectUtils.gaussianBlur() src image is not a supported type, type=[" +                    src.getType() + "]");        }        return dst;    }     /**     * <p>Blurs the source pixels into the destination pixels. The force of the blur is specified by the radius which     * must be greater than 0.</p> <p>The source and destination pixels arrays are expected to be in the INT_ARGB     * format.</p> <p>After this method is executed, dstPixels contains a transposed and filtered copy of     * srcPixels.</p>     *     * @param srcPixels the source pixels     * @param dstPixels the destination pixels     * @param width     the width of the source picture     * @param height    the height of the source picture     * @param kernel    the kernel of the blur effect     * @param radius    the radius of the blur effect     */    private static void blur(int[] srcPixels, int[] dstPixels,                             int width, int height,                             float[] kernel, int radius) {        float a;        float r;        float g;        float b;         int ca;        int cr;        int cg;        int cb;         for (int y = 0; y < height; y++) {            int index = y;            int offset = y * width;             for (int x = 0; x < width; x++) {                a = r = g = b = 0.0f;                 for (int i = -radius; i <= radius; i++) {                    int subOffset = x + i;                    if (subOffset < 0 || subOffset >= width) {                        subOffset = (x + width) % width;                    }                     int pixel = srcPixels[offset + subOffset];                    float blurFactor = kernel[radius + i];                     a += blurFactor * ((pixel >> 24) & 0xFF);                    r += blurFactor * ((pixel >> 16) & 0xFF);                    g += blurFactor * ((pixel >> 8) & 0xFF);                    b += blurFactor * ((pixel) & 0xFF);                }                 ca = (int) (a + 0.5f);                cr = (int) (r + 0.5f);                cg = (int) (g + 0.5f);                cb = (int) (b + 0.5f);                 dstPixels[index] = ((ca > 255 ? 255 : ca) << 24) |                        ((cr > 255 ? 255 : cr) << 16) |                        ((cg > 255 ? 255 : cg) << 8) |                        (cb > 255 ? 255 : cb);                index += height;            }        }    }     /**     * <p>Blurs the source pixels into the destination pixels. The force of the blur is specified by the radius which     * must be greater than 0.</p> <p>The source and destination pixels arrays are expected to be in the BYTE_GREY     * format.</p> <p>After this method is executed, dstPixels contains a transposed and filtered copy of     * srcPixels.</p>     *     * @param srcPixels the source pixels     * @param dstPixels the destination pixels     * @param width     the width of the source picture     * @param height    the height of the source picture     * @param kernel    the kernel of the blur effect     * @param radius    the radius of the blur effect     */    static void blur(byte[] srcPixels, byte[] dstPixels,                            int width, int height,                            float[] kernel, int radius) {        float p;        int cp;        for (int y = 0; y < height; y++) {            int index = y;            int offset = y * width;            for (int x = 0; x < width; x++) {                p = 0.0f;                for (int i = -radius; i <= radius; i++) {                    int subOffset = x + i;//                    if (subOffset < 0) subOffset = 0;//                    if (subOffset >= width) subOffset = width-1;                    if (subOffset < 0 || subOffset >= width) {                        subOffset = (x + width) % width;                    }                    int pixel = srcPixels[offset + subOffset] & 0xFF;                    float blurFactor = kernel[radius + i];                    p += blurFactor * pixel;                }                cp = (int) (p + 0.5f);                dstPixels[index] = (byte) (cp > 255 ? 255 : cp);                index += height;            }        }    }     static float[] createGaussianKernel(int radius) {        if (radius < 1) {            throw new IllegalArgumentException("Radius must be >= 1");        }         float[] data = new float[radius * 2 + 1];         float sigma = radius / 3.0f;        float twoSigmaSquare = 2.0f * sigma * sigma;        float sigmaRoot = (float) Math.sqrt(twoSigmaSquare * Math.PI);        float total = 0.0f;         for (int i = -radius; i <= radius; i++) {            float distance = i * i;            int index = i + radius;            data[index] = (float) Math.exp(-distance / twoSigmaSquare) / sigmaRoot;            total += data[index];        }         for (int i = 0; i < data.length; i++) {            data[i] /= total;        }         return data;    }     // =================================================================================================================    // Get/Set Pixels helper methods     /**     * <p>Returns an array of pixels, stored as integers, from a <code>BufferedImage</code>. The pixels are grabbed from     * a rectangular area defined by a location and two dimensions. Calling this method on an image of type different     * from <code>BufferedImage.TYPE_INT_ARGB</code> and <code>BufferedImage.TYPE_INT_RGB</code> will unmanage the     * image.</p>     *     * @param img    the source image     * @param x      the x location at which to start grabbing pixels     * @param y      the y location at which to start grabbing pixels     * @param w      the width of the rectangle of pixels to grab     * @param h      the height of the rectangle of pixels to grab     * @param pixels a pre-allocated array of pixels of size w*h; can be null     * @return <code>pixels</code> if non-null, a new array of integers otherwise     * @throws IllegalArgumentException is <code>pixels</code> is non-null and of length &lt; w*h     */    static byte[] getPixels(BufferedImage img,                                   int x, int y, int w, int h, byte[] pixels) {        if (w == 0 || h == 0) {            return new byte[0];        }         if (pixels == null) {            pixels = new byte[w * h];        } else if (pixels.length < w * h) {            throw new IllegalArgumentException("pixels array must have a length >= w*h");        }         int imageType = img.getType();        if (imageType == BufferedImage.TYPE_BYTE_GRAY) {            Raster raster = img.getRaster();            return (byte[]) raster.getDataElements(x, y, w, h, pixels);        } else {            throw new IllegalArgumentException("Only type BYTE_GRAY is supported");        }    }     /**     * <p>Writes a rectangular area of pixels in the destination <code>BufferedImage</code>. Calling this method on an     * image of type different from <code>BufferedImage.TYPE_INT_ARGB</code> and <code>BufferedImage.TYPE_INT_RGB</code>     * will unmanage the image.</p>     *     * @param img    the destination image     * @param x      the x location at which to start storing pixels     * @param y      the y location at which to start storing pixels     * @param w      the width of the rectangle of pixels to store     * @param h      the height of the rectangle of pixels to store     * @param pixels an array of pixels, stored as integers     * @throws IllegalArgumentException is <code>pixels</code> is non-null and of length &lt; w*h     */    static void setPixels(BufferedImage img,                                 int x, int y, int w, int h, byte[] pixels) {        if (pixels == null || w == 0 || h == 0) {            return;        } else if (pixels.length < w * h) {            throw new IllegalArgumentException("pixels array must have a length >= w*h");        }        int imageType = img.getType();        if (imageType == BufferedImage.TYPE_BYTE_GRAY) {            WritableRaster raster = img.getRaster();            raster.setDataElements(x, y, w, h, pixels);        } else {            throw new IllegalArgumentException("Only type BYTE_GRAY is supported");        }    }     /**     * <p>Returns an array of pixels, stored as integers, from a     * <code>BufferedImage</code>. The pixels are grabbed from a rectangular     * area defined by a location and two dimensions. Calling this method on     * an image of type different from <code>BufferedImage.TYPE_INT_ARGB</code>     * and <code>BufferedImage.TYPE_INT_RGB</code> will unmanage the image.</p>     *     * @param img the source image     * @param x the x location at which to start grabbing pixels     * @param y the y location at which to start grabbing pixels     * @param w the width of the rectangle of pixels to grab     * @param h the height of the rectangle of pixels to grab     * @param pixels a pre-allocated array of pixels of size w*h; can be null     * @return <code>pixels</code> if non-null, a new array of integers     *   otherwise     * @throws IllegalArgumentException is <code>pixels</code> is non-null and     *   of length &lt; w*h     */    public static int[] getPixels(BufferedImage img,                                  int x, int y, int w, int h, int[] pixels) {        if (w == 0 || h == 0) {            return new int[0];        }         if (pixels == null) {            pixels = new int[w * h];        } else if (pixels.length < w * h) {            throw new IllegalArgumentException("pixels array must have a length" +                                               " >= w*h");        }         int imageType = img.getType();        if (imageType == BufferedImage.TYPE_INT_ARGB ||            imageType == BufferedImage.TYPE_INT_RGB) {            Raster raster = img.getRaster();            return (int[]) raster.getDataElements(x, y, w, h, pixels);        }         // Unmanages the image        return img.getRGB(x, y, w, h, pixels, 0, w);    }     /**     * <p>Writes a rectangular area of pixels in the destination     * <code>BufferedImage</code>. Calling this method on     * an image of type different from <code>BufferedImage.TYPE_INT_ARGB</code>     * and <code>BufferedImage.TYPE_INT_RGB</code> will unmanage the image.</p>     *     * @param img the destination image     * @param x the x location at which to start storing pixels     * @param y the y location at which to start storing pixels     * @param w the width of the rectangle of pixels to store     * @param h the height of the rectangle of pixels to store     * @param pixels an array of pixels, stored as integers     * @throws IllegalArgumentException is <code>pixels</code> is non-null and     *   of length &lt; w*h     */    public static void setPixels(BufferedImage img,                                 int x, int y, int w, int h, int[] pixels) {        if (pixels == null || w == 0 || h == 0) {            return;        } else if (pixels.length < w * h) {            throw new IllegalArgumentException("pixels array must have a length" +                                               " >= w*h");        }         int imageType = img.getType();        if (imageType == BufferedImage.TYPE_INT_ARGB ||            imageType == BufferedImage.TYPE_INT_RGB) {            WritableRaster raster = img.getRaster();            raster.setDataElements(x, y, w, h, pixels);        } else {            // Unmanages the image            img.setRGB(x, y, w, h, pixels, 0, w);        }    }     /**     * <p>Returns a new <code>BufferedImage</code> using the same color model     * as the image passed as a parameter. The returned image is only compatible     * with the image passed as a parameter. This does not mean the returned     * image is compatible with the hardware.</p>     *     * @param image the reference image from which the color model of the new     *   image is obtained     * @return a new <code>BufferedImage</code>, compatible with the color model     *   of <code>image</code>     */    public static BufferedImage createColorModelCompatibleImage(BufferedImage image) {        ColorModel cm = image.getColorModel();        return new BufferedImage(cm,            cm.createCompatibleWritableRaster(image.getWidth(),                                              image.getHeight()),            cm.isAlphaPremultiplied(), null);    }     /**     * <p>Returns a new translucent compatible image of the specified width and     * height. That is, the returned <code>BufferedImage</code> is compatible with     * the graphics hardware. If the method is called in a headless     * environment, then the returned BufferedImage will be compatible with     * the source image.</p>     *     * @param width the width of the new image     * @param height the height of the new image     * @return a new translucent compatible <code>BufferedImage</code> of the     *   specified width and height     */    public static BufferedImage createCompatibleTranslucentImage(int width,                                                                 int height) {        return isHeadless() ?                new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB) :                getGraphicsConfiguration().createCompatibleImage(width, height,                                                   Transparency.TRANSLUCENT);    }     private static boolean isHeadless() {        return GraphicsEnvironment.isHeadless();    }     // Returns the graphics configuration for the primary screen    private static GraphicsConfiguration getGraphicsConfiguration() {        return GraphicsEnvironment.getLocalGraphicsEnvironment().                    getDefaultScreenDevice().getDefaultConfiguration();    } }