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      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 thousandth 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 // Dpi used to save to PDF or Cloud Print.
     24 const int kDefaultPdfDpi = 300;
     25 
     26 // LETTER: 8.5 x 11 inches
     27 const float kLetterWidthInch = 8.5f;
     28 const float kLetterHeightInch = 11.0f;
     29 
     30 // LEGAL: 8.5 x 14 inches
     31 const float kLegalWidthInch = 8.5f;
     32 const float kLegalHeightInch = 14.0f;
     33 
     34 // A4: 8.27 x 11.69 inches
     35 const float kA4WidthInch = 8.27f;
     36 const float kA4HeightInch = 11.69f;
     37 
     38 // A3: 11.69 x 16.54 inches
     39 const float kA3WidthInch = 11.69f;
     40 const float kA3HeightInch = 16.54f;
     41 
     42 // Converts from one unit system to another using integer arithmetics.
     43 PRINTING_EXPORT int ConvertUnit(int value, int old_unit, int new_unit);
     44 
     45 // Converts from one unit system to another using doubles.
     46 PRINTING_EXPORT double ConvertUnitDouble(double value, double old_unit,
     47                                          double new_unit);
     48 
     49 // Converts from 0.001 inch unit to 0.00001 meter.
     50 PRINTING_EXPORT int ConvertMilliInchToHundredThousanthMeter(int milli_inch);
     51 
     52 // Converts from 0.00001 meter unit to 0.001 inch.
     53 PRINTING_EXPORT int ConvertHundredThousanthMeterToMilliInch(int cmm);
     54 
     55 // Converts from 1 pixel to 1 point using integers.
     56 PRINTING_EXPORT int ConvertPixelsToPoint(int pixels);
     57 
     58 // Converts from 1 pixel to 1 point using doubles.
     59 PRINTING_EXPORT double ConvertPixelsToPointDouble(double pixels);
     60 
     61 // Converts from 1 point to 1 pixel using doubles.
     62 double ConvertPointsToPixelDouble(double points);
     63 
     64 }  // namespace printing
     65 
     66 #endif  // PRINTING_UNITS_H_
     67