Method applyMask

CodenameOne/src/com/codename1/ui/Image.java:1148–1175

(Object mask, int x, int y)

    ///
    /// image masked based on the given object
    public Image applyMask(Object mask, int x, int y) {
        int[] rgb = getRGB();
        byte[] maskData = ((IndexedImage) mask).getImageDataByte();
        int mWidth = ((IndexedImage) mask).getWidth();
        int mHeight = ((IndexedImage) mask).getHeight();
        int imgWidth = getWidth();
        int aWidth = imgWidth - x;
        int aHeight = getHeight() - y;
        if (aWidth > mWidth) {
            aWidth = mWidth;
        }
        if (aHeight > mHeight) {
            aHeight = mHeight;
        }

        for (int xPos = 0; xPos < aWidth; xPos++) {
            for (int yPos = 0; yPos < aHeight; yPos++) {
                int aX = x + xPos;
                int aY = y + yPos;
                int imagePos = aX + aY * imgWidth;
                int maskAlpha = maskData[aX + aY * mWidth] & 0xff;
                maskAlpha = (maskAlpha << 24) & 0xff000000;
                rgb[imagePos] = (rgb[imagePos] & 0xffffff) | maskAlpha;

            }
        }
        return createImageWithRgbCache(rgb, imgWidth, getHeight());
    }

    /// Applies the given alpha mask onto this image and returns the resulting image
    /// see the createMask method for indication on how to convert an image into an alpha