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use volatile image to optimize

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This commit is contained in:
Branislav Stojkovic
2016-10-24 21:26:28 +02:00
parent 04a0d6bea9
commit ac4ec9c390
1 changed files with 59 additions and 23 deletions
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diylc/diylc-swing/src/org/diylc/swing/plugins/cloud/view/browser/CloudGlassPane.java
+59 -23
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@@ -3,7 +3,10 @@ package org.diylc.swing.plugins.cloud.view.browser;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GridBagLayout;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.RenderingHints;
@@ -13,6 +16,7 @@ import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.VolatileImage;
import javax.swing.JPanel;
import javax.swing.Timer;
@@ -32,15 +36,21 @@ public class CloudGlassPane extends JPanel implements MouseListener, KeyListener
private long startTime;
private final int msPerPx = 6;
private final Color bgColor = new Color(192, 222, 237);
private Timer animationTimer;
private VolatileImage volatileImg;
public CloudGlassPane() {
addKeyListener(this);
addMouseListener(this);
setCursor(new Cursor(Cursor.WAIT_CURSOR));
setOpaque(false);
setBackground(new Color(192, 222, 237));
setBackground(bgColor);
setLayout(new GridBagLayout());
animationTimer = new Timer(20, new ActionListener() {
@@ -61,34 +71,60 @@ public class CloudGlassPane extends JPanel implements MouseListener, KeyListener
super.setVisible(aFlag);
};
private void createBackBuffer() {
GraphicsConfiguration gc = getGraphicsConfiguration();
volatileImg = gc.createCompatibleVolatileImage(getWidth(), getHeight());
}
@Override
public void paint(java.awt.Graphics g) {
Graphics2D g2d = (Graphics2D) g;
// g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.8f));
Image cloud = IconLoader.CloudBg.getImage();
createBackBuffer();
g2d.setColor(new Color(192, 222, 237));
g2d.fillRect(0, cloud.getHeight(null), getWidth(), getHeight());
do {
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
long ellapsed = System.currentTimeMillis() - startTime;
long dx = (ellapsed / msPerPx) % cloud.getWidth(null);
g2d.drawImage(cloud, -(int) dx, 0, null);
if (cloud.getWidth(null) - dx < getWidth()) {
g2d.drawImage(cloud, (int) (cloud.getWidth(null) - dx), 0, null);
}
// Validate the volatile image for the graphics configuration of this
// component. If the volatile image doesn't apply for this graphics configuration
// (in other words, the hardware acceleration doesn't apply for the new device)
// then we need to re-create it.
GraphicsConfiguration gc = this.getGraphicsConfiguration();
int valCode = volatileImg.validate(gc);
g2d.setColor(Color.white);
g2d.setFont(g2d.getFont().deriveFont(22f));
String text = "Querying the cloud, please hold on...";
FontMetrics metrics = g.getFontMetrics(g2d.getFont());
Rectangle rect = new Rectangle(getSize());
int x = (rect.width - metrics.stringWidth(text)) / 2;
int y = ((rect.height - metrics.getHeight()) / 2) + metrics.getAscent();
g.drawString(text, x, y);
};
// This means the device doesn't match up to this hardware accelerated image.
if (valCode == VolatileImage.IMAGE_INCOMPATIBLE) {
createBackBuffer(); // recreate the hardware accelerated image.
}
Graphics offscreenGraphics = volatileImg.getGraphics();
Graphics2D g2d = (Graphics2D) offscreenGraphics;
Image cloud = IconLoader.CloudBg.getImage();
g2d.setColor(bgColor);
g2d.fillRect(0, cloud.getHeight(null), getWidth(), getHeight());
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
long ellapsed = System.currentTimeMillis() - startTime;
long dx = (ellapsed / msPerPx) % cloud.getWidth(null);
g2d.drawImage(cloud, -(int) dx, 0, null);
if (cloud.getWidth(null) - dx < getWidth()) {
g2d.drawImage(cloud, (int) (cloud.getWidth(null) - dx), 0, null);
}
g2d.setColor(Color.white);
g2d.setFont(g2d.getFont().deriveFont(22f));
String text = "Querying the cloud, please hold on...";
FontMetrics metrics = g.getFontMetrics(g2d.getFont());
Rectangle rect = new Rectangle(getSize());
int x = (rect.width - metrics.stringWidth(text)) / 2;
int y = ((rect.height - metrics.getHeight()) / 2) + metrics.getAscent();
g2d.drawString(text, x, y);
// paint back buffer to main graphics
g.drawImage(volatileImg, 0, 0, this);
// Test if content is lost
} while (volatileImg.contentsLost());
}
@Override
public void mouseClicked(final MouseEvent pArg0) {}