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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "printing/units.h" | 5 #include "printing/units.h" |
6 | 6 |
7 #include "base/logging.h" | 7 #include "base/logging.h" |
8 #include "printing/print_job_constants.h" | 8 #include "printing/print_job_constants.h" |
9 | 9 |
10 namespace printing { | 10 namespace printing { |
11 | 11 |
12 int ConvertUnit(int value, int old_unit, int new_unit) { | 12 int ConvertUnit(double value, int old_unit, int new_unit) { |
13 DCHECK_GT(new_unit, 0); | 13 DCHECK_GT(new_unit, 0); |
14 DCHECK_GT(old_unit, 0); | 14 DCHECK_GT(old_unit, 0); |
15 // With integer arithmetic, to divide a value with correct rounding, you need | 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 | 16 // to add half of the divisor value to the dividend value. You need to do the |
17 // reverse with negative number. | 17 // reverse with negative number. |
18 if (value >= 0) { | 18 if (value >= 0) { |
19 return ((value * new_unit) + (old_unit / 2)) / old_unit; | 19 return ((value * new_unit) + (old_unit / 2)) / old_unit; |
20 } else { | 20 } else { |
21 return ((value * new_unit) - (old_unit / 2)) / old_unit; | 21 return ((value * new_unit) - (old_unit / 2)) / old_unit; |
22 } | 22 } |
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46 | 46 |
47 double ConvertPixelsToPointDouble(double pixels) { | 47 double ConvertPixelsToPointDouble(double pixels) { |
48 return ConvertUnitDouble(pixels, kPixelsPerInch, kPointsPerInch); | 48 return ConvertUnitDouble(pixels, kPixelsPerInch, kPointsPerInch); |
49 } | 49 } |
50 | 50 |
51 double ConvertPointsToPixelDouble(double points) { | 51 double ConvertPointsToPixelDouble(double points) { |
52 return ConvertUnitDouble(points, kPointsPerInch, kPixelsPerInch); | 52 return ConvertUnitDouble(points, kPointsPerInch, kPixelsPerInch); |
53 } | 53 } |
54 | 54 |
55 } // namespace printing | 55 } // namespace printing |
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