Examples of java.awt.image.VolatileImage.validate()

java.awt.image.VolatileImage.validate()
Attempts to restore the drawing surface of the image if the surface had been lost since the last validate call. Also validates this image against the given GraphicsConfiguration parameter to see whether operations from this image to the GraphicsConfiguration are compatible. An example of an incompatible combination might be a situation where a VolatileImage object was created on one graphics device and then was used to render to a different graphics device. Since VolatileImage objects tend to be very device-specific, this operation might not work as intended, so the return code from this validate call would note that incompatibility. A null or incorrect value for gc may cause incorrect values to be returned from validate and may cause later problems with rendering. @param gc a GraphicsConfiguration object for thisimage to be validated against. A null gc implies that the validate method should skip the compatibility test. @return IMAGE_OK if the image did not need validation
IMAGE_RESTORED if the image needed restoration. Restoration implies that the contents of the image may have been affected and the image may need to be re-rendered.
IMAGE_INCOMPATIBLE if the image is incompatible with the GraphicsConfiguration object passed into the validate method. Incompatibility implies that the image may need to be recreated with a new Component or GraphicsConfiguration in order to get an image that can be used successfully with this GraphicsConfiguration. An incompatible image is not checked for whether restoration was necessary, so the state of the image is unchanged after a return value of IMAGE_INCOMPATIBLE and this return value implies nothing about whether the image needs to be restored. @see java.awt.GraphicsConfiguration @see java.awt.Component @see #IMAGE_OK @see #IMAGE_RESTORED @see #IMAGE_INCOMPATIBLE

                VolatileImage vImage = (java.awt.image.VolatileImage)offscreen;
                GraphicsConfiguration gc = bufferComponent.
                                            getGraphicsConfiguration();
                for (int i = 0; !paintCompleted &&
                         i < RepaintManager.VOLATILE_LOOP_MAX; i++) {
                    if (vImage.validate(gc) ==
                                   VolatileImage.IMAGE_INCOMPATIBLE) {
                        repaintManager.resetVolatileDoubleBuffer(gc);
                        offscreen = repaintManager.getVolatileOffscreenBuffer(
                            bufferComponent,w, h);
                        vImage = (java.awt.image.VolatileImage)offscreen;

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            // validate the buffer so we can check for surface loss
            int bufferStatus = VolatileImage.IMAGE_INCOMPATIBLE;


            if (buffer != null) {
                bufferStatus = buffer.validate(config);
            }


            // If the buffer status is incompatible or restored, then we need to
            // re-render to the volatile image
            if (bufferStatus == VolatileImage.IMAGE_INCOMPATIBLE || bufferStatus == VolatileImage.IMAGE_RESTORED) {

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                VolatileImage vImage = (java.awt.image.VolatileImage)offscreen;
                GraphicsConfiguration gc = bufferComponent.
                                            getGraphicsConfiguration();
                for (int i = 0; !paintCompleted &&
                         i < RepaintManager.VOLATILE_LOOP_MAX; i++) {
                    if (vImage.validate(gc) ==
                                   VolatileImage.IMAGE_INCOMPATIBLE) {
                        repaintManager.resetVolatileDoubleBuffer(gc);
                        offscreen = repaintManager.getVolatileOffscreenBuffer(
                            bufferComponent,w, h);
                        vImage = (java.awt.image.VolatileImage)offscreen;

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                GraphicsEnvironment
                .getLocalGraphicsEnvironment()
                .getDefaultScreenDevice()
                .getDefaultConfiguration();
            VolatileImage vimg = cfg.createCompatibleVolatileImage(8, 1);
            vimg.validate(cfg);
            Graphics2D g2d = vimg.createGraphics();
            for (int i = 0; i < 100; i++) {
                g2d.drawImage(ctx.bimg, 0, 0, null);
            }
            g2d.dispose();

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        }


        VolatileImage vi = gc.createCompatibleVolatileImage(R_WIDTH, R_HEIGHT);
        BufferedImage bi = null;
        do {
            vi.validate(gc);
            Graphics2D g = vi.createGraphics();
            render(g, vi.getWidth(), vi.getHeight());
            bi = vi.getSnapshot();
        } while (vi.contentsLost());

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        } else {
            System.err.println("No screen rendering checks.");
        }


        VolatileImage vi = gc.createCompatibleVolatileImage(512, 512);
        vi.validate(gc);


        long timeStarted = System.currentTimeMillis();
        while (!done && (System.currentTimeMillis() - timeStarted) < RUN_TIME) {


            if (++cnt > 100) {

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                cnt = 0;
            }


            // try to put the device into non-default state, for example,
            // this operation below will set the transform
            vi.validate(gc);
            Graphics2D vig = (Graphics2D)vi.getGraphics();
            vig.rotate(30.0f, vi.getWidth()/2, vi.getHeight()/2);
            vig.drawImage(output, 0, 0,
                          vi.getWidth(), vi.getHeight(), null);

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            vi = (VolatileImage)image;
        }
        do {
            if (vi != null) {
                GraphicsConfiguration gc = getGraphicsConfiguration();
                if (vi.validate(gc) != VolatileImage.IMAGE_OK) {
                    initImage(gc, vi);
                }
            }
            g.drawImage(image,
                    dstRect.x, dstRect.y,

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    static VolatileImage getVImage(GraphicsConfiguration gc,
                                   int w, int h)
    {
        VolatileImage image =
            gc.createCompatibleVolatileImage(w, h, Transparency.OPAQUE);
        image.validate(gc);
        initImage(gc, image);
        return image;
    }


    static Image getBMImage(GraphicsConfiguration gc,

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    private static final String text =
        "The quick brown fox jumps over the lazy dog 1234567890";
    private static void renderText(Frame frame, Font f1) {
        VolatileImage vi = frame.createVolatileImage(256, 32);
        vi.validate(frame.getGraphicsConfiguration());


        Graphics2D g = vi.createGraphics();
        g.setFont(f1);
        g.drawString(text, 0, vi.getHeight()/2);
        g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,

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