1// Copyright (c) 2011 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#ifndef PRINTING_UNITS_H_ 6#define PRINTING_UNITS_H_ 7 8#include "printing/printing_export.h" 9 10namespace printing { 11 12// Length of a thousanth of inches in 0.01mm unit. 13const int kHundrethsMMPerInch = 2540; 14 15// Length of an inch in CSS's 1pt unit. 16// http://dev.w3.org/csswg/css3-values/#absolute-length-units-cm-mm.-in-pt-pc 17const int kPointsPerInch = 72; 18 19// Length of an inch in CSS's 1px unit. 20// http://dev.w3.org/csswg/css3-values/#the-px-unit 21const int kPixelsPerInch = 96; 22 23// Converts from one unit system to another using integer arithmetics. 24PRINTING_EXPORT int ConvertUnit(int value, int old_unit, int new_unit); 25 26// Converts from one unit system to another using doubles. 27PRINTING_EXPORT double ConvertUnitDouble(double value, double old_unit, 28 double new_unit); 29 30// Converts from 0.001 inch unit to 0.00001 meter. 31PRINTING_EXPORT int ConvertMilliInchToHundredThousanthMeter(int milli_inch); 32 33// Converts from 0.00001 meter unit to 0.001 inch. 34PRINTING_EXPORT int ConvertHundredThousanthMeterToMilliInch(int cmm); 35 36// Converts from 1 pixel to 1 point using integers. 37PRINTING_EXPORT int ConvertPixelsToPoint(int pixels); 38 39// Converts from 1 pixel to 1 point using doubles. 40PRINTING_EXPORT double ConvertPixelsToPointDouble(double pixels); 41 42// Converts from 1 point to 1 pixel using doubles. 43double ConvertPointsToPixelDouble(double points); 44 45} // namespace printing 46 47#endif // PRINTING_UNITS_H_ 48