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printing / units.cc [blame]
// Copyright 2011 The Chromium Authors
// 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/check_op.h"
#include "printing/print_job_constants.h"
namespace printing {
int ConvertUnit(float 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;
}
}
float ConvertUnitFloat(float value, float old_unit, float new_unit) {
DCHECK_GT(new_unit, 0);
DCHECK_GT(old_unit, 0);
return value * new_unit / old_unit;
}
} // namespace printing