Java Utililty Methods Image Clear

List of utility methods to do Image Clear

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Description

The list of methods to do Image Clear are organized into topic(s).

Method

voidclear(BufferedImage image, int col)
clear 
for (int i = 0; i < image.getWidth(); i++)
    for (int j = 0; j < image.getHeight(); j++)
        image.setRGB(i, j, col);
voidclear(Image img)
clear 
Graphics g = img.getGraphics();
try {
    if ((g instanceof Graphics2D)) {
        ((Graphics2D) g).setComposite(AlphaComposite.Clear);
    } else {
        g.setColor(new Color(0, 0, 0, 0));
    g.fillRect(0, 0, img.getWidth(null), img.getHeight(null));
...
voidclearImage(BufferedImage bi)
Sets all pixels of the given image to black and fully transparent (RGBA 0). 
for (int x = 0; x < bi.getWidth(); x++) {
    for (int y = 0; y < bi.getHeight(); y++) {
        bi.setRGB(x, y, 0);
voidclearImage(BufferedImage image)
Convenience method for 'clearing' a BufferedImage. 
int width = image.getWidth();
int height = image.getHeight();
int numpix = width * height;
int[] argbClear = new int[width * height];
for (int i = 0; i < width * height; i++) {
    argbClear[i] = 0x00000000;
image.setRGB(0, 0, width, height, argbClear, 0, width);
...
voidclearImage(BufferedImage img)
Clear a transparent image to 100% transparent 
Graphics2D g2 = img.createGraphics();
g2.setComposite(AlphaComposite.Clear);
g2.fillRect(0, 0, img.getWidth(), img.getHeight());
g2.dispose();
BufferedImageclearImage(BufferedImage img)
Clears image does NOT make copy My "optimization" for not making new buffered image every time render is called 
if (img == null) {
    return null;
Graphics2D g = img.createGraphics();
g.setComposite(AlphaComposite.Clear);
g.fillRect(0, 0, img.getWidth(), img.getHeight());
g.setComposite(AlphaComposite.SrcOver);
g.dispose();
...
voidclearImage(final BufferedImage image)
clear Image 
final Graphics2D g2d = image.createGraphics();
final Composite composite = g2d.getComposite();
g2d.setComposite(AlphaComposite.Clear);
g2d.fillRect(0, 0, image.getWidth(), image.getHeight());
g2d.setComposite(composite);
g2d.dispose();
voidclearMergedImagesCache()
clear Merged Images Cache 
mergedImagesCache.clear();