BitmapUtils.java 文件源码

public static Bitmap createColorFilteredBitmap(Bitmap origBitmap,
        ColorMatrix cm) {
    if (origBitmap == null || cm == null) {
        return origBitmap;
    }

    final int width = origBitmap.getWidth();
    final int height = origBitmap.getHeight();
    if (width <= 0 || height <= 0) {
        return origBitmap;
    }

    Bitmap filteredBitmap = Bitmap.createBitmap(width,
            height, Config.ARGB_8888);

    Canvas c = new Canvas(filteredBitmap);

    ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);      

    Paint paint = new Paint();
    paint.setColorFilter(f);

    c.drawBitmap(origBitmap, 0, 0, paint);

    return filteredBitmap;
}