/*
* Copyright (c) 2009 Kathryn Huxtable and Kenneth Orr.
*
* This file is part of the SeaGlass Pluggable Look and Feel.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* $Id: EffectUtils.java 1115 2010-02-09 21:26:16Z kathryn@kathrynhuxtable.org $
*/
package com.seaglasslookandfeel.effect;
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
*
* <p>Copied from Nimbus's EffectUtils by Jasper Potts. This was and is package
* local.</p>
*/
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;
}
}
}
/**
* Create a Gaussian kernel for the transformation.
*
* @param radius the kernel radius.
*
* @return the Gaussian kernel.
*/
protected 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
*/
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
*/
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
*/
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
*/
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);
}
/**
* Is the graphics environment headless?
*
* @return {@code true} if the graphics environment is headless,
* {@code false} otherwise.
*/
private static boolean isHeadless() {
return GraphicsEnvironment.isHeadless();
}
/**
* Returns the graphics configuration for the primary screen
*
* @return the graphics configuration.
*/
private static GraphicsConfiguration getGraphicsConfiguration() {
return GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getDefaultConfiguration();
}
}