15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2011 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "printing/units.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "printing/print_job_constants.h" 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace printing { 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int ConvertUnit(int value, int old_unit, int new_unit) { 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_GT(new_unit, 0); 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_GT(old_unit, 0); 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // With integer arithmetic, to divide a value with correct rounding, you need 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // to add half of the divisor value to the dividend value. You need to do the 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // reverse with negative number. 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (value >= 0) { 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ((value * new_unit) + (old_unit / 2)) / old_unit; 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ((value * new_unit) - (old_unit / 2)) / old_unit; 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)double ConvertUnitDouble(double value, double old_unit, double new_unit) { 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_GT(new_unit, 0); 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_GT(old_unit, 0); 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return value * new_unit / old_unit; 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int ConvertMilliInchToHundredThousanthMeter(int milli_inch) { 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 1" == 25.4 mm 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 1" == 25400 um 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 0.001" == 25.4 um 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 0.001" == 2.54 cmm 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ConvertUnit(milli_inch, 100, 254); 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int ConvertHundredThousanthMeterToMilliInch(int cmm) { 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ConvertUnit(cmm, 254, 100); 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int ConvertPixelsToPoint(int pixels) { 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ConvertUnit(pixels, kPixelsPerInch, kPointsPerInch); 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)double ConvertPixelsToPointDouble(double pixels) { 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ConvertUnitDouble(pixels, kPixelsPerInch, kPointsPerInch); 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)double ConvertPointsToPixelDouble(double points) { 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ConvertUnitDouble(points, kPointsPerInch, kPixelsPerInch); 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace printing 56