printing/units.h

   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 // Splits the horizontal width equally into segments with an interstice
  46 // between each segment. Returns the width of a segment.
  47 PRINTING_EXPORT double GetHeaderFooterSegmentWidth(double page_width);
  48
  49 }  // namespace printing
  50
  51 #endif  // PRINTING_UNITS_H_