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 10 namespace printing { 11 12 // Length of a thousanth of inches in 0.01mm unit. 13 const 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 17 const 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 21 const int kPixelsPerInch = 96; 22 23 // Converts from one unit system to another using integer arithmetics. 24 PRINTING_EXPORT int ConvertUnit(int value, int old_unit, int new_unit); 25 26 // Converts from one unit system to another using doubles. 27 PRINTING_EXPORT double ConvertUnitDouble(double value, double old_unit, 28 double new_unit); 29 30 // Converts from 0.001 inch unit to 0.00001 meter. 31 PRINTING_EXPORT int ConvertMilliInchToHundredThousanthMeter(int milli_inch); 32 33 // Converts from 0.00001 meter unit to 0.001 inch. 34 PRINTING_EXPORT int ConvertHundredThousanthMeterToMilliInch(int cmm); 35 36 // Converts from 1 pixel to 1 point using integers. 37 PRINTING_EXPORT int ConvertPixelsToPoint(int pixels); 38 39 // Converts from 1 pixel to 1 point using doubles. 40 PRINTING_EXPORT double ConvertPixelsToPointDouble(double pixels); 41 42 // Converts from 1 point to 1 pixel using doubles. 43 double ConvertPointsToPixelDouble(double points); 44 45 } // namespace printing 46 47 #endif // PRINTING_UNITS_H_ 48
