Let AWTGLCanvas.getGraphics() return Graphics which ignores clearRect()

to prevent clearing through the Canvas' Graphics object

Author: hageldave

pom.xml

@@ -3,7 +3,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>org.lwjglx</groupId>
 	<artifactId>lwjgl3-awt</artifactId>
-	<version>0.1.4</version>
+	<version>0.1.5-SNAPSHOT</version>
 	<name>LWJGLX/lwjgl3-awt</name>
 	<description>LWJGLX/lwjgl3-awt</description>
 	<inceptionYear>2016</inceptionYear>

src/org/lwjgl/awthacks/NonClearGraphics.java

@@ -0,0 +1,238 @@
+package org.lwjgl.awthacks;
+
+import java.awt.Color;
+import java.awt.Font;
+import java.awt.FontMetrics;
+import java.awt.Graphics;
+import java.awt.Image;
+import java.awt.Polygon;
+import java.awt.Rectangle;
+import java.awt.Shape;
+import java.awt.image.ImageObserver;
+import java.text.AttributedCharacterIterator;
+
+/**
+ * Wrapper for a {@link Graphics} object that delegates to it.
+ * Only {@link NonClearGraphics#clearRect(int, int, int, int)} does
+ * not delegate in order to prevent clearing the Canvas after
+ * it was rendered.
+ * 
+ * @author hageldave
+ * @see NonClearGraphics2D
+ */
+public class NonClearGraphics extends Graphics {
+
+	protected Graphics delegate;
+	
+	public NonClearGraphics(Graphics delegate) {
+		this.delegate = delegate;
+	}
+
+	/**
+	 * Does nothing. This is to prevent a clearRect call from 
+	 * clearing the already rendered Canvas.
+	 */
+	public void clearRect(int x, int y, int width, int height) {
+		// NOOP
+	}
+
+	@Deprecated
+	public Rectangle getClipRect() {
+		return delegate.getClipRect();
+	}
+
+	public NonClearGraphics create() {
+		return new NonClearGraphics(delegate.create());
+	}
+
+	public NonClearGraphics create(int x, int y, int width, int height) {
+		return new NonClearGraphics(delegate.create(x, y, width, height));
+	}
+
+	public void translate(int x, int y) {
+		delegate.translate(x, y);
+	}
+
+	public Color getColor() {
+		return delegate.getColor();
+	}
+
+	public void setColor(Color c) {
+		delegate.setColor(c);
+	}
+
+	public void setPaintMode() {
+		delegate.setPaintMode();
+	}
+
+	public void setXORMode(Color c1) {
+		delegate.setXORMode(c1);
+	}
+
+	public Font getFont() {
+		return delegate.getFont();
+	}
+
+	public void setFont(Font font) {
+		delegate.setFont(font);
+	}
+
+	public FontMetrics getFontMetrics() {
+		return delegate.getFontMetrics();
+	}
+
+	public FontMetrics getFontMetrics(Font f) {
+		return delegate.getFontMetrics(f);
+	}
+
+	public Rectangle getClipBounds() {
+		return delegate.getClipBounds();
+	}
+
+	public void clipRect(int x, int y, int width, int height) {
+		delegate.clipRect(x, y, width, height);
+	}
+
+	public void setClip(int x, int y, int width, int height) {
+		delegate.setClip(x, y, width, height);
+	}
+
+	public Shape getClip() {
+		return delegate.getClip();
+	}
+
+	public void setClip(Shape clip) {
+		delegate.setClip(clip);
+	}
+
+	public void copyArea(int x, int y, int width, int height, int dx, int dy) {
+		delegate.copyArea(x, y, width, height, dx, dy);
+	}
+
+	public void drawLine(int x1, int y1, int x2, int y2) {
+		delegate.drawLine(x1, y1, x2, y2);
+	}
+
+	public void fillRect(int x, int y, int width, int height) {
+		delegate.fillRect(x, y, width, height);
+	}
+
+	public void drawRect(int x, int y, int width, int height) {
+		delegate.drawRect(x, y, width, height);
+	}
+
+	public void drawRoundRect(int x, int y, int width, int height, int arcWidth, int arcHeight) {
+		delegate.drawRoundRect(x, y, width, height, arcWidth, arcHeight);
+	}
+
+	public void fillRoundRect(int x, int y, int width, int height, int arcWidth, int arcHeight) {
+		delegate.fillRoundRect(x, y, width, height, arcWidth, arcHeight);
+	}
+
+	public void draw3DRect(int x, int y, int width, int height, boolean raised) {
+		delegate.draw3DRect(x, y, width, height, raised);
+	}
+
+	public void fill3DRect(int x, int y, int width, int height, boolean raised) {
+		delegate.fill3DRect(x, y, width, height, raised);
+	}
+
+	public void drawOval(int x, int y, int width, int height) {
+		delegate.drawOval(x, y, width, height);
+	}
+
+	public void fillOval(int x, int y, int width, int height) {
+		delegate.fillOval(x, y, width, height);
+	}
+
+	public void drawArc(int x, int y, int width, int height, int startAngle, int arcAngle) {
+		delegate.drawArc(x, y, width, height, startAngle, arcAngle);
+	}
+
+	public void fillArc(int x, int y, int width, int height, int startAngle, int arcAngle) {
+		delegate.fillArc(x, y, width, height, startAngle, arcAngle);
+	}
+
+	public void drawPolyline(int[] xPoints, int[] yPoints, int nPoints) {
+		delegate.drawPolyline(xPoints, yPoints, nPoints);
+	}
+
+	public void drawPolygon(int[] xPoints, int[] yPoints, int nPoints) {
+		delegate.drawPolygon(xPoints, yPoints, nPoints);
+	}
+
+	public void drawPolygon(Polygon p) {
+		delegate.drawPolygon(p);
+	}
+
+	public void fillPolygon(int[] xPoints, int[] yPoints, int nPoints) {
+		delegate.fillPolygon(xPoints, yPoints, nPoints);
+	}
+
+	public void fillPolygon(Polygon p) {
+		delegate.fillPolygon(p);
+	}
+
+	public void drawString(String str, int x, int y) {
+		delegate.drawString(str, x, y);
+	}
+
+	public void drawString(AttributedCharacterIterator iterator, int x, int y) {
+		delegate.drawString(iterator, x, y);
+	}
+
+	public void drawChars(char[] data, int offset, int length, int x, int y) {
+		delegate.drawChars(data, offset, length, x, y);
+	}
+
+	public void drawBytes(byte[] data, int offset, int length, int x, int y) {
+		delegate.drawBytes(data, offset, length, x, y);
+	}
+
+	public boolean drawImage(Image img, int x, int y, ImageObserver observer) {
+		return delegate.drawImage(img, x, y, observer);
+	}
+
+	public boolean drawImage(Image img, int x, int y, int width, int height, ImageObserver observer) {
+		return delegate.drawImage(img, x, y, width, height, observer);
+	}
+
+	public boolean drawImage(Image img, int x, int y, Color bgcolor, ImageObserver observer) {
+		return delegate.drawImage(img, x, y, bgcolor, observer);
+	}
+
+	public boolean drawImage(Image img, int x, int y, int width, int height, Color bgcolor, ImageObserver observer) {
+		return delegate.drawImage(img, x, y, width, height, bgcolor, observer);
+	}
+
+	public boolean drawImage(Image img, int dx1, int dy1, int dx2, int dy2, int sx1, int sy1, int sx2, int sy2,
+			ImageObserver observer) {
+		return delegate.drawImage(img, dx1, dy1, dx2, dy2, sx1, sy1, sx2, sy2, observer);
+	}
+
+	public boolean drawImage(Image img, int dx1, int dy1, int dx2, int dy2, int sx1, int sy1, int sx2, int sy2,
+			Color bgcolor, ImageObserver observer) {
+		return delegate.drawImage(img, dx1, dy1, dx2, dy2, sx1, sy1, sx2, sy2, bgcolor, observer);
+	}
+
+	public void dispose() {
+		delegate.dispose();
+	}
+
+	public void finalize() {
+		delegate.finalize();
+	}
+
+	public String toString() {
+		return delegate.toString();
+	}
+
+	public boolean hitClip(int x, int y, int width, int height) {
+		return delegate.hitClip(x, y, width, height);
+	}
+
+	public Rectangle getClipBounds(Rectangle r) {
+		return delegate.getClipBounds(r);
+	}
+	
+}