| // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "printing/units.h" |
| |
| #include "base/logging.h" |
| #include "printing/print_job_constants.h" |
| |
| namespace printing { |
| |
| int ConvertUnit(int value, int old_unit, int new_unit) { |
| DCHECK_GT(new_unit, 0); |
| DCHECK_GT(old_unit, 0); |
| // With integer arithmetic, to divide a value with correct rounding, you need |
| // to add half of the divisor value to the dividend value. You need to do the |
| // reverse with negative number. |
| if (value >= 0) { |
| return ((value * new_unit) + (old_unit / 2)) / old_unit; |
| } else { |
| return ((value * new_unit) - (old_unit / 2)) / old_unit; |
| } |
| } |
| |
| double ConvertUnitDouble(double value, double old_unit, double new_unit) { |
| DCHECK_GT(new_unit, 0); |
| DCHECK_GT(old_unit, 0); |
| return value * new_unit / old_unit; |
| } |
| |
| int ConvertMilliInchToHundredThousanthMeter(int milli_inch) { |
| // 1" == 25.4 mm |
| // 1" == 25400 um |
| // 0.001" == 25.4 um |
| // 0.001" == 2.54 cmm |
| return ConvertUnit(milli_inch, 100, 254); |
| } |
| |
| int ConvertHundredThousanthMeterToMilliInch(int cmm) { |
| return ConvertUnit(cmm, 254, 100); |
| } |
| |
| int ConvertPixelsToPoint(int pixels) { |
| return ConvertUnit(pixels, kPixelsPerInch, kPointsPerInch); |
| } |
| |
| double ConvertPixelsToPointDouble(double pixels) { |
| return ConvertUnitDouble(pixels, kPixelsPerInch, kPointsPerInch); |
| } |
| |
| double ConvertPointsToPixelDouble(double points) { |
| return ConvertUnitDouble(points, kPointsPerInch, kPixelsPerInch); |
| } |
| |
| double GetHeaderFooterSegmentWidth(double page_width) { |
| // Interstice is left at both ends of the page as well as between |
| // each region, so 1 is added. |
| double total_interstice_width = (kSettingHeaderFooterHorizontalRegions + 1) * |
| kSettingHeaderFooterInterstice; |
| return (page_width - total_interstice_width) / |
| kSettingHeaderFooterHorizontalRegions; |
| } |
| |
| } // namespace printing |