/*******************************************************************************
* Copyright (c) 2014 Dirk Fauth.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Dirk Fauth <dirk.fauth@googlemail.com> - initial API and implementation
******************************************************************************/
package org.eclipse.nebula.widgets.nattable.layer;
/**
* Interface to add support for scaling.
* <p>
* This interface is inspired by Riena and the corresponding talk at EclipseCon
* 2014 <a
* href="http://www.slideshare.net/da152/swt-scalingece2014-aktuell">Scaling SWT
* on high-resolution screens</a>
* </p>
*/
public interface IDpiConverter {
/**
* Returns the dots per inch of the display.
*
* @return the horizontal and vertical DPI
*/
int getDpi();
/**
*
* @return The factor that will be used for the current DPI.
*/
float getCurrentDpiFactor();
/**
* Converts the given amount of pixels to a DPI scaled value.
*
* @param pixel
* the amount of pixels to convert.
* @return The converted pixels.
*/
int convertPixelToDpi(int pixel);
/**
* Converts the given DPI scaled value to a pixel value.
*
* @param dpi
* the DPI value to convert.
* @return The pixel value related to the given DPI
*/
int convertDpiToPixel(int dpi);
}