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comparison: gfx/skia/trunk/src/pathops/SkPathOpsCurve.h
gfx/skia/trunk/src/pathops/SkPathOpsCurve.h
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- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:df13ea5b5b30 |
|---|---|
| 1 /* | |
| 2 * Copyright 2012 Google Inc. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 #ifndef SkPathOpsCurve_DEFINE | |
| 8 #define SkPathOpsCurve_DEFINE | |
| 9 | |
| 10 #include "SkPathOpsCubic.h" | |
| 11 #include "SkPathOpsLine.h" | |
| 12 #include "SkPathOpsQuad.h" | |
| 13 | |
| 14 static SkDPoint dline_xy_at_t(const SkPoint a[2], double t) { | |
| 15 SkDLine line; | |
| 16 line.set(a); | |
| 17 return line.ptAtT(t); | |
| 18 } | |
| 19 | |
| 20 static SkDPoint dquad_xy_at_t(const SkPoint a[3], double t) { | |
| 21 SkDQuad quad; | |
| 22 quad.set(a); | |
| 23 return quad.ptAtT(t); | |
| 24 } | |
| 25 | |
| 26 static SkDPoint dcubic_xy_at_t(const SkPoint a[4], double t) { | |
| 27 SkDCubic cubic; | |
| 28 cubic.set(a); | |
| 29 return cubic.ptAtT(t); | |
| 30 } | |
| 31 | |
| 32 static SkDPoint (* const CurveDPointAtT[])(const SkPoint[], double ) = { | |
| 33 NULL, | |
| 34 dline_xy_at_t, | |
| 35 dquad_xy_at_t, | |
| 36 dcubic_xy_at_t | |
| 37 }; | |
| 38 | |
| 39 static SkPoint fline_xy_at_t(const SkPoint a[2], double t) { | |
| 40 return dline_xy_at_t(a, t).asSkPoint(); | |
| 41 } | |
| 42 | |
| 43 static SkPoint fquad_xy_at_t(const SkPoint a[3], double t) { | |
| 44 return dquad_xy_at_t(a, t).asSkPoint(); | |
| 45 } | |
| 46 | |
| 47 static SkPoint fcubic_xy_at_t(const SkPoint a[4], double t) { | |
| 48 return dcubic_xy_at_t(a, t).asSkPoint(); | |
| 49 } | |
| 50 | |
| 51 static SkPoint (* const CurvePointAtT[])(const SkPoint[], double ) = { | |
| 52 NULL, | |
| 53 fline_xy_at_t, | |
| 54 fquad_xy_at_t, | |
| 55 fcubic_xy_at_t | |
| 56 }; | |
| 57 | |
| 58 static SkDVector dline_dxdy_at_t(const SkPoint a[2], double ) { | |
| 59 SkDLine line; | |
| 60 line.set(a); | |
| 61 return line[1] - line[0]; | |
| 62 } | |
| 63 | |
| 64 static SkDVector dquad_dxdy_at_t(const SkPoint a[3], double t) { | |
| 65 SkDQuad quad; | |
| 66 quad.set(a); | |
| 67 return quad.dxdyAtT(t); | |
| 68 } | |
| 69 | |
| 70 static SkDVector dcubic_dxdy_at_t(const SkPoint a[4], double t) { | |
| 71 SkDCubic cubic; | |
| 72 cubic.set(a); | |
| 73 return cubic.dxdyAtT(t); | |
| 74 } | |
| 75 | |
| 76 static SkDVector (* const CurveDSlopeAtT[])(const SkPoint[], double ) = { | |
| 77 NULL, | |
| 78 dline_dxdy_at_t, | |
| 79 dquad_dxdy_at_t, | |
| 80 dcubic_dxdy_at_t | |
| 81 }; | |
| 82 | |
| 83 static SkVector fline_dxdy_at_t(const SkPoint a[2], double ) { | |
| 84 return a[1] - a[0]; | |
| 85 } | |
| 86 | |
| 87 static SkVector fquad_dxdy_at_t(const SkPoint a[3], double t) { | |
| 88 return dquad_dxdy_at_t(a, t).asSkVector(); | |
| 89 } | |
| 90 | |
| 91 static SkVector fcubic_dxdy_at_t(const SkPoint a[4], double t) { | |
| 92 return dcubic_dxdy_at_t(a, t).asSkVector(); | |
| 93 } | |
| 94 | |
| 95 static SkVector (* const CurveSlopeAtT[])(const SkPoint[], double ) = { | |
| 96 NULL, | |
| 97 fline_dxdy_at_t, | |
| 98 fquad_dxdy_at_t, | |
| 99 fcubic_dxdy_at_t | |
| 100 }; | |
| 101 | |
| 102 static SkPoint quad_top(const SkPoint a[3], double startT, double endT) { | |
| 103 SkDQuad quad; | |
| 104 quad.set(a); | |
| 105 SkDPoint topPt = quad.top(startT, endT); | |
| 106 return topPt.asSkPoint(); | |
| 107 } | |
| 108 | |
| 109 static SkPoint cubic_top(const SkPoint a[4], double startT, double endT) { | |
| 110 SkDCubic cubic; | |
| 111 cubic.set(a); | |
| 112 SkDPoint topPt = cubic.top(startT, endT); | |
| 113 return topPt.asSkPoint(); | |
| 114 } | |
| 115 | |
| 116 static SkPoint (* const CurveTop[])(const SkPoint[], double , double ) = { | |
| 117 NULL, | |
| 118 NULL, | |
| 119 quad_top, | |
| 120 cubic_top | |
| 121 }; | |
| 122 | |
| 123 static bool line_is_vertical(const SkPoint a[2], double startT, double endT) { | |
| 124 SkDLine line; | |
| 125 line.set(a); | |
| 126 SkDPoint dst[2] = { line.ptAtT(startT), line.ptAtT(endT) }; | |
| 127 return AlmostEqualUlps(dst[0].fX, dst[1].fX); | |
| 128 } | |
| 129 | |
| 130 static bool quad_is_vertical(const SkPoint a[3], double startT, double endT) { | |
| 131 SkDQuad quad; | |
| 132 quad.set(a); | |
| 133 SkDQuad dst = quad.subDivide(startT, endT); | |
| 134 return AlmostEqualUlps(dst[0].fX, dst[1].fX) && AlmostEqualUlps(dst[1].fX, dst[2].fX); | |
| 135 } | |
| 136 | |
| 137 static bool cubic_is_vertical(const SkPoint a[4], double startT, double endT) { | |
| 138 SkDCubic cubic; | |
| 139 cubic.set(a); | |
| 140 SkDCubic dst = cubic.subDivide(startT, endT); | |
| 141 return AlmostEqualUlps(dst[0].fX, dst[1].fX) && AlmostEqualUlps(dst[1].fX, dst[2].fX) | |
| 142 && AlmostEqualUlps(dst[2].fX, dst[3].fX); | |
| 143 } | |
| 144 | |
| 145 static bool (* const CurveIsVertical[])(const SkPoint[], double , double) = { | |
| 146 NULL, | |
| 147 line_is_vertical, | |
| 148 quad_is_vertical, | |
| 149 cubic_is_vertical | |
| 150 }; | |
| 151 | |
| 152 #endif |
