Java Code Examples for java.awt.image.BufferedImage.getAlphaRaster()

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Example 1
Project: incubator-netbeans   File: ColorUtil.java   View Source Code Vote up 6 votes
/**
 * Create a backing bitmap, painting the texture into it with the specified
 * parameters.  The bitmap will be created at 2*height, so that even if
 * there is some minor variation in height, it will not force recreating the
 * bitmap
 */
private static BufferedImage createBitmap(int height, int type,
                                          int yDecline) {

    //Create an optimal image for blitting to the screen with no format conversion
    BufferedImage result = GraphicsEnvironment.getLocalGraphicsEnvironment()
            .getDefaultScreenDevice().getDefaultConfiguration().createCompatibleImage(
                    200, height * 2);

    Graphics g = result.getGraphics();

    if (result.getAlphaRaster() == null) {
        Color c = type == FOCUS_TYPE ?
                MetalViewTabDisplayerUI.getActBgColor() :
                MetalViewTabDisplayerUI.getInactBgColor();
        g.setColor(c);
        g.fillRect(0, 0, DEFAULT_IMAGE_WIDTH, height * 2);
    }

    //draw the texture into the offscreen image
    _drawTexture(g, 0, 0, DEFAULT_IMAGE_WIDTH, height * 2, type, yDecline);
    return result;
}