Method modifyAlpha

CodenameOne/src/com/codename1/ui/Image.java:1362–1383

(byte alpha)

    /// @return Translucent/Opaque image based on the alpha value and the pixels of
    /// this image
    public Image modifyAlpha(byte alpha) {
        int w = getWidth();
        int h = getHeight();
        int size = w * h;
        int[] arr = getRGB();
        if (isSimdOptimizationsEnabled() && size >= 16) {
            int alphaInt = (((int) alpha) << 24) & 0xff000000;
            replaceAlphaPreserveTransparentSimd(arr, 0, alphaInt, size);
        } else {
            int alphaInt = (((int) alpha) << 24) & 0xff000000;
            for (int iter = 0; iter < size; iter++) {
                int currentAlpha = (arr[iter] >> 24) & 0xff;
                if (currentAlpha != 0) {
                    arr[iter] = (arr[iter] & 0xffffff) | alphaInt;
                }
            }
        }
        Image i = createImageWithRgbCache(arr, w, h);
        i.opaqueTested = true;
        i.opaque = false;
        return i;
    }

    /// Creates a new image instance with the alpha channel of opaque
    /// pixels within the image using the new alpha value. Transparent (alpha == 0)