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* 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).
*
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package sun.swing;
import sun.awt.image.SurfaceManager;
import sun.java2d.SurfaceData;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.awt.image.AbstractMultiResolutionImage;
import java.awt.image.BufferedImage;
import java.awt.image.ImageObserver;
import java.awt.image.VolatileImage;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
/**
* A base class used for icons or images that are expensive to paint.
* A subclass will do the following:
* <ol>
* <li>Invoke <code>paint</code> when you want to paint the image,
* if you are implementing <code>Icon</code> you'll invoke this from
* <code>paintIcon</code>.
* The args argument is useful when additional state is needed.
* <li>Override <code>paintToImage</code> to render the image. The code that
* lives here is equivalent to what previously would go in
* <code>paintIcon</code>, for an <code>Icon</code>.
* </ol>
* The two ways to use this class are:
* <ol>
* <li>Invoke <code>paint</code> to draw the cached reprensentation at
* the specified location.
* <li>Invoke <code>getImage</code> to get the cached reprensentation and
* draw the image yourself. This is primarly useful when you are not
* using <code>VolatileImage</code>.
* </ol>
*
*
*/
public abstract class CachedPainter {
// CacheMap maps from class to ImageCache.
private static final Map<Object,ImageCache> cacheMap = new HashMap<>();
private static ImageCache getCache(Object key) {
synchronized(CachedPainter.class) {
ImageCache cache = cacheMap.get(key);
if (cache == null) {
if (key == PainterMultiResolutionCachedImage.class) {
cache = new ImageCache(32);
} else {
cache = new ImageCache(1);
}
cacheMap.put(key, cache);
}
return cache;
}
}
/**
* Creates an instance of <code>CachedPainter</code> that will cache up
* to <code>cacheCount</code> images of this class.
*
* @param cacheCount Max number of images to cache
*/
public CachedPainter(int cacheCount) {
getCache(getClass()).setMaxCount(cacheCount);
}
/**
* Renders the cached image to the passed in <code>Graphic</code>.
* If there is no cached image <code>paintToImage</code> will be invoked.
* <code>paintImage</code> is invoked to paint the cached image.
*
* @param c Component rendering to, this may be null.
* @param g Graphics to paint to
* @param x X-coordinate to render to
* @param y Y-coordinate to render to
* @param w Width to render in
* @param h Height to render in
* @param args Variable arguments that will be passed to paintToImage
*/
public void paint(Component c, Graphics g, int x,
int y, int w, int h, Object... args) {
if (w <= 0 || h <= 0) {
return;
}
synchronized (CachedPainter.class) {
paint0(c, g, x, y, w, h, args);
}
}
private Image getImage(Object key, Component c,
int baseWidth, int baseHeight,
int w, int h, Object... args) {
GraphicsConfiguration config = getGraphicsConfiguration(c);
ImageCache cache = getCache(key);
Image image = cache.getImage(key, config, w, h, args);
int attempts = 0;
VolatileImage volatileImage = (image instanceof VolatileImage)
? (VolatileImage) image
: null;
do {
boolean draw = false;
if (volatileImage != null) {
// See if we need to recreate the image
switch (volatileImage.validate(config)) {
case VolatileImage.IMAGE_INCOMPATIBLE:
volatileImage.flush();
image = null;
break;
case VolatileImage.IMAGE_RESTORED:
draw = true;
break;
}
}
if (image == null) {
// Recreate the image
if( config != null && (w != baseHeight || h != baseWidth)) {
AffineTransform tx = config.getDefaultTransform();
double sx = tx.getScaleX();
double sy = tx.getScaleY();
if ( Double.compare(sx, 1) != 0 ||
Double.compare(sy, 1) != 0) {
if (Math.abs(sx * baseWidth - w) < 1 &&
Math.abs(sy * baseHeight - h) < 1) {
w = baseWidth;
h = baseHeight;
} else {
w = (int)Math.ceil(w / sx);
h = (int)Math.ceil(w / sy);
}
}
}
image = createImage(c, w, h, config, args);
cache.setImage(key, config, w, h, args, image);
draw = true;
volatileImage = (image instanceof VolatileImage)
? (VolatileImage) image
: null;
}
if (draw) {
// Render to the Image
Graphics2D g2 = (Graphics2D) image.getGraphics();
if (volatileImage == null) {
if ((w != baseWidth || h != baseHeight)) {
g2.scale((double) w / baseWidth,
(double) h / baseHeight);
}
paintToImage(c, image, g2, baseWidth, baseHeight, args);
} else {
SurfaceData sd = SurfaceManager.getManager(volatileImage)
.getPrimarySurfaceData();
double sx = sd.getDefaultScaleX();
double sy = sd.getDefaultScaleY();
if ( Double.compare(sx, 1) != 0 ||
Double.compare(sy, 1) != 0) {
g2.scale(1 / sx, 1 / sy);
}
paintToImage(c, image, g2, (int)Math.ceil(w * sx),
(int)Math.ceil(h * sy), args);
}
g2.dispose();
}
// If we did this 3 times and the contents are still lost
// assume we're painting to a VolatileImage that is bogus and
// give up. Presumably we'll be called again to paint.
} while ((volatileImage != null) &&
volatileImage.contentsLost() && ++attempts < 3);
return image;
}
private void paint0(Component c, Graphics g, int x,
int y, int w, int h, Object... args) {
Object key = getClass();
GraphicsConfiguration config = getGraphicsConfiguration(c);
ImageCache cache = getCache(key);
Image image = cache.getImage(key, config, w, h, args);
if (image == null) {
image = new PainterMultiResolutionCachedImage(w, h);
cache.setImage(key, config, w, h, args, image);
}
if (image instanceof PainterMultiResolutionCachedImage) {
((PainterMultiResolutionCachedImage) image).setParams(c, args);
}
// Render to the passed in Graphics
paintImage(c, g, x, y, w, h, image, args);
}
/**
* Paints the representation to cache to the supplied Graphics.
*
* @param c Component painting to, may be null.
* @param image Image to paint to
* @param g Graphics to paint to, obtained from the passed in Image.
* @param w Width to paint to
* @param h Height to paint to
* @param args Arguments supplied to <code>paint</code>
*/
protected abstract void paintToImage(Component c, Image image, Graphics g,
int w, int h, Object[] args);
/**
* Paints the image to the specified location.
*
* @param c Component painting to
* @param g Graphics to paint to
* @param x X coordinate to paint to
* @param y Y coordinate to paint to
* @param w Width to paint to
* @param h Height to paint to
* @param image Image to paint
* @param args Arguments supplied to <code>paint</code>
*/
protected void paintImage(Component c, Graphics g,
int x, int y, int w, int h, Image image,
Object[] args) {
g.drawImage(image, x, y, null);
}
/**
* Creates the image to cache. This returns an opaque image, subclasses
* that require translucency or transparency will need to override this
* method.
*
* @param c Component painting to
* @param w Width of image to create
* @param h Height to image to create
* @param config GraphicsConfiguration that will be
* rendered to, this may be null.
* @param args Arguments passed to paint
*/
protected Image createImage(Component c, int w, int h,
GraphicsConfiguration config, Object[] args) {
if (config == null) {
return new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
}
return config.createCompatibleVolatileImage(w, h);
}
/**
* Clear the image cache
*/
protected void flush() {
synchronized(CachedPainter.class) {
getCache(getClass()).flush();
}
}
private GraphicsConfiguration getGraphicsConfiguration(Component c) {
if (c == null) {
return null;
}
return c.getGraphicsConfiguration();
}
class PainterMultiResolutionCachedImage extends AbstractMultiResolutionImage {
private final int baseWidth;
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