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 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_