Spans.java 文件源码

@Override
public void draw(@NonNull Rect outRect, @NonNull Canvas canvas, CharSequence text, @IntRange(from = 0) int start, @IntRange(from = 0) int end, float x, int top, int y, int bottom, @NonNull Paint paint) {
    if (bitmap == null) {
        bitmap = Bitmap.createBitmap(frame.right - frame.left, frame.bottom - frame.top, Bitmap.Config.ARGB_8888);
        bitmapCanvas = new Canvas(bitmap);
    }
    bitmapCanvas.drawColor(Color.BLACK, PorterDuff.Mode.CLEAR);
    bitmapCanvas.translate(-x, 0);
    super.draw(outRect, bitmapCanvas, text, start, end, x, top, y, bottom, paint);
    Xfermode oldXfermode = paint.getXfermode();
    paint.setXfermode(this.xfermode);
    srcGroup.draw(outRect, bitmapCanvas, text, start, end, x, top, y, bottom, paint);
    paint.setXfermode(oldXfermode);
    canvas.drawBitmap(bitmap, x, 0, null);
}