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Diffstat (limited to 'chromium/printing/units.cc')
-rw-r--r-- | chromium/printing/units.cc | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/chromium/printing/units.cc b/chromium/printing/units.cc new file mode 100644 index 00000000000..dcee9ea56af --- /dev/null +++ b/chromium/printing/units.cc @@ -0,0 +1,55 @@ +// 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); +} + +} // namespace printing |