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comparison data/model/PowerOfTwoZoomConstraint.cpp @ 1527:710e6250a401 zoom

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Merge from default branch
author Chris Cannam
date Mon, 17 Sep 2018 13:51:14 +0100
parents d4a28d1479a8 48e9f538e6e9
children c1c45c5146bb
comparison
equal deleted inserted replaced
1324:d4a28d1479a8 1527:710e6250a401
43 } 43 }
44 } 44 }
45 45
46 int 46 int
47 PowerOfTwoZoomConstraint::getNearestBlockSize(int req, 47 PowerOfTwoZoomConstraint::getNearestBlockSize(int req,
48 RoundingDirection dir) const 48 RoundingDirection dir) const
49 { 49 {
50 int result = 0; 50 int result = 0;
51 51
52 for (int bs = 1; ; bs *= 2) { 52 for (int bs = 1; ; bs *= 2) {
53 if (bs >= req) { 53 if (bs >= req) {
54 if (dir == RoundNearest) { 54 if (dir == RoundNearest) {
55 if (bs - req < req - bs/2) { 55 if (bs - req < req - bs/2) {
56 result = bs; 56 result = bs;
57 break; 57 break;
58 } else { 58 } else {
59 result = bs/2; 59 result = bs/2;
60 break; 60 break;
61 } 61 }
62 } else if (dir == RoundDown) { 62 } else if (dir == RoundDown) {
63 result = bs/2; 63 result = bs/2;
64 break; 64 break;
65 } else { 65 } else {
66 result = bs; 66 result = bs;
67 break; 67 break;
68 } 68 }
69 } 69 }
70 } 70 }
71 71
72 if (result > getMaxZoomLevel().level) result = getMaxZoomLevel().level; 72 if (result > getMaxZoomLevel().level) result = getMaxZoomLevel().level;
73 return result; 73 return result;
74 } 74 }