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| 1 | |
| 2 /* | 1 /* |
| 3 * Copyright 2011 Google Inc. | 2 * Copyright 2011 Google Inc. |
| 4 * | 3 * |
| 5 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
| 6 * found in the LICENSE file. | 5 * found in the LICENSE file. |
| 7 */ | 6 */ |
| 8 | 7 |
| 8 #include "GrPathUtils.h" |
| 9 | 9 |
| 10 #include "GrPathUtils.h" | |
| 11 #include "GrPoint.h" | 10 #include "GrPoint.h" |
| 12 #include "SkGeometry.h" | 11 #include "SkGeometry.h" |
| 13 | 12 |
| 14 SkScalar GrPathUtils::scaleToleranceToSrc(SkScalar devTol, | 13 SkScalar GrPathUtils::scaleToleranceToSrc(SkScalar devTol, |
| 15 const SkMatrix& viewM, | 14 const SkMatrix& viewM, |
| 16 const GrRect& pathBounds) { | 15 const SkRect& pathBounds) { |
| 17 // In order to tesselate the path we get a bound on how much the matrix can | 16 // In order to tesselate the path we get a bound on how much the matrix can |
| 18 // stretch when mapping to screen coordinates. | 17 // stretch when mapping to screen coordinates. |
| 19 SkScalar stretch = viewM.getMaxStretch(); | 18 SkScalar stretch = viewM.getMaxStretch(); |
| 20 SkScalar srcTol = devTol; | 19 SkScalar srcTol = devTol; |
| 21 | 20 |
| 22 if (stretch < 0) { | 21 if (stretch < 0) { |
| 23 // take worst case mapRadius amoung four corners. | 22 // take worst case mapRadius amoung four corners. |
| 24 // (less than perfect) | 23 // (less than perfect) |
| 25 for (int i = 0; i < 4; ++i) { | 24 for (int i = 0; i < 4; ++i) { |
| 26 SkMatrix mat; | 25 SkMatrix mat; |
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| 470 // base tolerance is 1 pixel. | 469 // base tolerance is 1 pixel. |
| 471 static const SkScalar kTolerance = SK_Scalar1; | 470 static const SkScalar kTolerance = SK_Scalar1; |
| 472 const SkScalar tolSqd = SkScalarSquare(SkScalarMul(tolScale, kTolerance)); | 471 const SkScalar tolSqd = SkScalarSquare(SkScalarMul(tolScale, kTolerance)); |
| 473 | 472 |
| 474 for (int i = 0; i < count; ++i) { | 473 for (int i = 0; i < count; ++i) { |
| 475 SkPoint* cubic = chopped + 3*i; | 474 SkPoint* cubic = chopped + 3*i; |
| 476 convert_noninflect_cubic_to_quads(cubic, tolSqd, constrainWithinTangents
, dir, quads); | 475 convert_noninflect_cubic_to_quads(cubic, tolSqd, constrainWithinTangents
, dir, quads); |
| 477 } | 476 } |
| 478 | 477 |
| 479 } | 478 } |
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