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/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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.
*/
package com.android.ide.common.util;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Paint;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.awt.image.BufferedImageOp;
import java.awt.image.ConvolveOp;
import java.awt.image.Kernel;
import java.awt.image.Raster;
import java.awt.image.RescaleOp;
import java.util.ArrayList;
import java.util.List;
/**
* A set of utility classes for manipulating {@link BufferedImage} objects and drawing them to
* {@link Graphics2D} canvases.
*/
public class AssetUtil {
/**
* Scales the given rectangle by the given scale factor.
*
* @param rect The rectangle to scale.
* @param scaleFactor The factor to scale by.
* @return The scaled rectangle.
*/
public static Rectangle scaleRectangle(Rectangle rect, float scaleFactor) {
return new Rectangle(
Math.round(rect.x * scaleFactor),
Math.round(rect.y * scaleFactor),
Math.round(rect.width * scaleFactor),
Math.round(rect.height * scaleFactor));
}
/**
* Creates a new ARGB {@link BufferedImage} of the given width and height.
*
* @param width The width of the new image.
* @param height The height of the new image.
* @return The newly created image.
*/
public static BufferedImage newArgbBufferedImage(int width, int height) {
return new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
}
/**
* Smoothly scales the given {@link BufferedImage} to the given width and height using the
* {@link Image#SCALE_SMOOTH} algorithm (generally bicubic resampling or bilinear filtering).
*
* @param source The source image.
* @param width The destination width to scale to.
* @param height The destination height to scale to.
* @return A new, scaled image.
*/
public static BufferedImage scaledImage(BufferedImage source, int width, int height) {
Image scaledImage = source.getScaledInstance(width, height, Image.SCALE_SMOOTH);
BufferedImage scaledBufImage = new BufferedImage(width, height,
BufferedImage.TYPE_INT_ARGB);
Graphics g = scaledBufImage.createGraphics();
g.drawImage(scaledImage, 0, 0, null);
g.dispose();
return scaledBufImage;
}
/**
* Applies a gaussian blur of the given radius to the given {@link BufferedImage} using a kernel
* convolution.
*
* @param source The source image.
* @param radius The blur radius, in pixels.
* @return A new, blurred image, or the source image if no blur is performed.
*/
public static BufferedImage blurredImage(BufferedImage source, double radius) {
if (radius == 0) {
return source;
}
final int r = (int) Math.ceil(radius);
final int rows = r * 2 + 1;
final float[] kernelData = new float[rows * rows];
final double sigma = radius / 3;
final double sigma22 = 2 * sigma * sigma;
final double sqrtPiSigma22 = Math.sqrt(Math.PI * sigma22);
final double radius2 = radius * radius;
double total = 0;
int index = 0;
double distance2;
int x, y;
for (y = -r; y <= r; y++) {
for (x = -r; x <= r; x++) {
distance2 = 1.0 * x * x + 1.0 * y * y;
if (distance2 > radius2) {
kernelData[index] = 0;
} else {
kernelData[index] = (float) (Math.exp(-distance2 / sigma22) / sqrtPiSigma22);
}
total += kernelData[index];
++index;
}
}
for (index = 0; index < kernelData.length; index++) {
kernelData[index] /= total;
}
// We first pad the image so the kernel can operate at the edges.
BufferedImage paddedSource = paddedImage(source, r);
BufferedImage blurredPaddedImage = operatedImage(paddedSource, new ConvolveOp(
new Kernel(rows, rows, kernelData), ConvolveOp.EDGE_ZERO_FILL, null));
return blurredPaddedImage.getSubimage(r, r, source.getWidth(), source.getHeight());
}
/**
* Inverts the alpha channel of the given {@link BufferedImage}. RGB data for the inverted area
* are undefined, so it's generally best to fill the resulting image with a color.
*
* @param source The source image.
* @return A new image with an alpha channel inverted from the original.
*/
public static BufferedImage invertedAlphaImage(BufferedImage source) {
final float[] scaleFactors = new float[]{1, 1, 1, -1};
final float[] offsets = new float[]{0, 0, 0, 255};
return operatedImage(source, new RescaleOp(scaleFactors, offsets, null));
}
/**
* Applies a {@link BufferedImageOp} on the given {@link BufferedImage}.
*
* @param source The source image.
* @param op The operation to perform.
* @return A new image with the operation performed.
*/
public static BufferedImage operatedImage(BufferedImage source, BufferedImageOp op) {
BufferedImage newImage = newArgbBufferedImage(source.getWidth(), source.getHeight());
Graphics2D g = (Graphics2D) newImage.getGraphics();
g.drawImage(source, op, 0, 0);
return newImage;
}
/**
* Fills the given {@link BufferedImage} with a {@link Paint}, preserving its alpha channel.
*
* @param source The source image.
* @param paint The paint to fill with.
* @return A new, painted/filled image.
*/
public static BufferedImage filledImage(BufferedImage source, Paint paint) {
BufferedImage newImage = newArgbBufferedImage(source.getWidth(), source.getHeight());
Graphics2D g = (Graphics2D) newImage.getGraphics();
g.drawImage(source, 0, 0, null);
g.setComposite(AlphaComposite.SrcAtop);
g.setPaint(paint);
g.fillRect(0, 0, source.getWidth(), source.getHeight());
return newImage;
}
/**
* Pads the given {@link BufferedImage} on all sides by the given padding amount.
*
* @param source The source image.
* @param padding The amount to pad on all sides, in pixels.
* @return A new, padded image, or the source image if no padding is performed.
*/
public static BufferedImage paddedImage(BufferedImage source, int padding) {
if (padding == 0) {
return source;
}
BufferedImage newImage = newArgbBufferedImage(
source.getWidth() + padding * 2, source.getHeight() + padding * 2);
Graphics2D g = (Graphics2D) newImage.getGraphics();
g.drawImage(source, padding, padding, null);
return newImage;
}
/**
* Trims the transparent pixels from the given {@link BufferedImage} (returns a sub-image).
*
* @param source The source image.
* @return A new, trimmed image, or the source image if no trim is performed.
*/
public static BufferedImage trimmedImage(BufferedImage source) {
final int minAlpha = 1;
final int srcWidth = source.getWidth();
final int srcHeight = source.getHeight();
Raster raster = source.getRaster();
int l = srcWidth, t = srcHeight, r = 0, b = 0;
int alpha, x, y;
int[] pixel = new int[4];
for (y = 0; y < srcHeight; y++) {
for (x = 0; x < srcWidth; x++) {
raster.getPixel(x, y, pixel);
alpha = pixel[3];
if (alpha >= minAlpha) {
l = Math.min(x, l);
t = Math.min(y, t);
r = Math.max(x, r);
b = Math.max(y, b);
}
}
}
if (l > r || t > b) {
// No pixels, couldn't trim
return source;
}
return source.getSubimage(l, t, r - l + 1, b - t + 1);
}
/**
* Draws the given {@link BufferedImage} to the canvas, at the given coordinates, with the given
* {@link Effect}s applied. Note that drawn effects may be outside the bounds of the source
* image.
*
* @param g The destination canvas.
* @param source The source image.
* @param x The x offset at which to draw the image.
* @param y The y offset at which to draw the image.
* @param effects The list of effects to apply.
*/
public static void drawEffects(Graphics2D g, BufferedImage source, int x, int y,
Effect[] effects) {
List shadowEffects = new ArrayList();
List fillEffects = new ArrayList();
for (Effect effect : effects) {
if (effect instanceof ShadowEffect) {
shadowEffects.add((ShadowEffect) effect);
} else if (effect instanceof FillEffect) {
fillEffects.add((FillEffect) effect);
}
}
Composite oldComposite = g.getComposite();
for (ShadowEffect effect : shadowEffects) {
if (effect.inner) {
continue;
}
// Outer shadow
g.setComposite(AlphaComposite.getInstance(
AlphaComposite.SRC_OVER, (float) effect.opacity));
g.drawImage(
filledImage(
blurredImage(source, effect.radius),
effect.color),
(int) effect.xOffset, (int) effect.yOffset, null);
}
g.setComposite(oldComposite);
// Inner shadow & fill effects.
final Rectangle imageRect = new Rectangle(0, 0, source.getWidth(), source.getHeight());
BufferedImage out = newArgbBufferedImage(imageRect.width, imageRect.height);
Graphics2D g2 = (Graphics2D) out.getGraphics();
double fillOpacity = 1.0;
g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1.0f));
g2.drawImage(source, 0, 0, null);
g2.setComposite(AlphaComposite.SrcAtop);
// Gradient fill
for (FillEffect effect : fillEffects) {
g2.setPaint(effect.paint);
g2.fillRect(0, 0, imageRect.width, imageRect.height);
fillOpacity = Math.max(0, Math.min(1, effect.opacity));
}
// Inner shadows
for (ShadowEffect effect : shadowEffects) {
if (!effect.inner) {
continue;
}
BufferedImage innerShadowImage = newArgbBufferedImage(
imageRect.width, imageRect.height);
Graphics2D g3 = (Graphics2D) innerShadowImage.getGraphics();
g3.drawImage(source, (int) effect.xOffset, (int) effect.yOffset, null);
g2.setComposite(AlphaComposite.getInstance(
AlphaComposite.SRC_ATOP, (float) effect.opacity));
g2.drawImage(
filledImage(
blurredImage(invertedAlphaImage(innerShadowImage), effect.radius),
effect.color),
0, 0, null);
}
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, (float) fillOpacity));
g.drawImage(out, x, y, null);
g.setComposite(oldComposite);
}
/**
* Draws the given {@link BufferedImage} to the canvas, centered, wholly contained within the
* bounds defined by the destination rectangle, and with preserved aspect ratio.
*
* @param g The destination canvas.
* @param source The source image.
* @param dstRect The destination rectangle in the destination canvas into which to draw the
* image.
*/
public static void drawCenterInside(Graphics2D g, BufferedImage source, Rectangle dstRect) {
final int srcWidth = source.getWidth();
final int srcHeight = source.getHeight();
if (srcWidth * 1.0 / srcHeight > dstRect.width * 1.0 / dstRect.height) {
final int scaledWidth = Math.max(1, dstRect.width);
final int scaledHeight = Math.max(1, dstRect.width * srcHeight / srcWidth);
Image scaledImage = scaledImage(source, scaledWidth, scaledHeight);
g.drawImage(scaledImage,
dstRect.x,
dstRect.y + (dstRect.height - scaledHeight) / 2,
dstRect.x + dstRect.width,
dstRect.y + (dstRect.height - scaledHeight) / 2 + scaledHeight,
0,
0,
0 + scaledWidth,
0 + scaledHeight,
null);
} else {
final int scaledWidth = Math.max(1, dstRect.height * srcWidth / srcHeight);
final int scaledHeight = Math.max(1, dstRect.height);
Image scaledImage = scaledImage(source, scaledWidth, scaledHeight);
g.drawImage(scaledImage,
dstRect.x + (dstRect.width - scaledWidth) / 2,
dstRect.y,
dstRect.x + (dstRect.width - scaledWidth) / 2 + scaledWidth,
dstRect.y + dstRect.height,
0,
0,
0 + scaledWidth,
0 + scaledHeight,
null);
}
}
/**
* Draws the given {@link BufferedImage} to the canvas, centered and cropped to fill the
* bounds defined by the destination rectangle, and with preserved aspect ratio.
*
* @param g The destination canvas.
* @param source The source image.
* @param dstRect The destination rectangle in the destination canvas into which to draw the
* image.
*/
public static void drawCenterCrop(Graphics2D g, BufferedImage source, Rectangle dstRect) {
final int srcWidth = source.getWidth();
final int srcHeight = source.getHeight();
if (srcWidth * 1.0 / srcHeight > dstRect.width * 1.0 / dstRect.height) {
final int scaledWidth = dstRect.height * srcWidth / srcHeight;
final int scaledHeight = dstRect.height;
Image scaledImage = scaledImage(source, scaledWidth, scaledHeight);
g.drawImage(scaledImage,
dstRect.x,
dstRect.y,
dstRect.x + dstRect.width,
dstRect.y + dstRect.height,
0 + (scaledWidth - dstRect.width) / 2,
0,
0 + (scaledWidth - dstRect.width) / 2 + dstRect.width,
0 + dstRect.height,
null);
} else {
final int scaledWidth = dstRect.width;
final int scaledHeight = dstRect.width * srcHeight / srcWidth;
Image scaledImage = scaledImage(source, scaledWidth, scaledHeight);
g.drawImage(scaledImage,
dstRect.x,
dstRect.y,
dstRect.x + dstRect.width,
dstRect.y + dstRect.height,
0,
0 + (scaledHeight - dstRect.height) / 2,
0 + dstRect.width,
0 + (scaledHeight - dstRect.height) / 2 + dstRect.height,
null);
}
}
/**
* An effect to apply in
* {@link AssetUtil#drawEffects(java.awt.Graphics2D, java.awt.image.BufferedImage, int, int, AssetUtil.Effect[])}
*/
public abstract static class Effect {
}
/**
* An inner or outer shadow.
*/
public static class ShadowEffect extends Effect {
public double xOffset;
public double yOffset;
public double radius;
public Color color;
public double opacity;
public boolean inner;
public ShadowEffect(double xOffset, double yOffset, double radius, Color color,
double opacity, boolean inner) {
this.xOffset = xOffset;
this.yOffset = yOffset;
this.radius = radius;
this.color = color;
this.opacity = opacity;
this.inner = inner;
}
}
/**
* A fill, defined by a paint.
*/
public static class FillEffect extends Effect {
public Paint paint;
public double opacity;
public FillEffect(Paint paint, double opacity) {
this.paint = paint;
this.opacity = opacity;
}
public FillEffect(Paint paint) {
this.paint = paint;
this.opacity = 1.0;
}
}
}
