45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "precompiled_libcef.h"
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#include "units.h"
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#include "base/logging.h"
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namespace printing {
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int ConvertUnit(int value, int old_unit, int new_unit) {
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DCHECK_GT(new_unit, 0);
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DCHECK_GT(old_unit, 0);
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// With integer arithmetic, to divide a value with correct rounding, you need
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// to add half of the divisor value to the dividend value. You need to do the
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// reverse with negative number.
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if (value >= 0) {
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return ((value * new_unit) + (old_unit / 2)) / old_unit;
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} else {
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return ((value * new_unit) - (old_unit / 2)) / old_unit;
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}
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}
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double ConvertUnitDouble(double value, double old_unit, double new_unit) {
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DCHECK_GT(new_unit, 0);
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DCHECK_GT(old_unit, 0);
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return value * new_unit / old_unit;
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}
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int ConvertMilliInchToHundredThousanthMeter(int milli_inch) {
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// 1" == 25.4 mm
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// 1" == 25400 um
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// 0.001" == 25.4 um
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// 0.001" == 2.54 cmm
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return ConvertUnit(milli_inch, 100, 254);
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}
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int ConvertHundredThousanthMeterToMilliInch(int cmm) {
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return ConvertUnit(cmm, 254, 100);
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}
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} // namespace printing
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