1 // Copyright 2011 The Chromium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "printing/units.h"
7 #include "base/check_op.h"
8 #include "printing/print_job_constants.h"
12 int ConvertUnit(float value, int old_unit, int new_unit) {
13 DCHECK_GT(new_unit, 0);
14 DCHECK_GT(old_unit, 0);
15 // With integer arithmetic, to divide a value with correct rounding, you need
16 // to add half of the divisor value to the dividend value. You need to do the
17 // reverse with negative number.
19 return ((value * new_unit) + (old_unit / 2)) / old_unit;
21 return ((value * new_unit) - (old_unit / 2)) / old_unit;
25 float ConvertUnitFloat(float value, float old_unit, float new_unit) {
26 DCHECK_GT(new_unit, 0);
27 DCHECK_GT(old_unit, 0);
28 return value * new_unit / old_unit;
31 } // namespace printing