if (mRenderer != null && mRenderer.isZoomEnabled() && mRenderer.isZoomButtonsVisible()) {
      mPaint.setColor(ZOOM_BUTTONS_COLOR);
      zoomSize = Math.max(zoomSize, Math.min(width, height) / 7);
      mZoomR.set(left + width - zoomSize * 3, top + height - zoomSize * 0.775f, left + width, top
          + height);
      canvas.drawRoundRect(mZoomR, zoomSize / 3, zoomSize / 3, mPaint);
      float buttonY = top + height - zoomSize * 0.625f;
      canvas.drawBitmap(zoomInImage, left + width - zoomSize * 2.75f, buttonY, null);
      canvas.drawBitmap(zoomOutImage, left + width - zoomSize * 1.75f, buttonY, null);
      canvas.drawBitmap(fitZoomImage, left + width - zoomSize * 0.75f, buttonY, null);
    }