| /* |
| * Copyright 2019 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkPathMakers_DEFINED |
| #define SkPathMakers_DEFINED |
| |
| #include "include/core/SkPath.h" // just for direction |
| #include "include/core/SkPoint.h" |
| #include "include/core/SkRRect.h" |
| |
| template <unsigned N> class SkPath_PointIterator { |
| public: |
| SkPath_PointIterator(SkPath::Direction dir, unsigned startIndex) |
| : fCurrent(startIndex % N) |
| , fAdvance(dir == SkPath::kCW_Direction ? 1 : N - 1) { } |
| |
| const SkPoint& current() const { |
| SkASSERT(fCurrent < N); |
| return fPts[fCurrent]; |
| } |
| |
| const SkPoint& next() { |
| fCurrent = (fCurrent + fAdvance) % N; |
| return this->current(); |
| } |
| |
| protected: |
| SkPoint fPts[N]; |
| |
| private: |
| unsigned fCurrent; |
| unsigned fAdvance; |
| }; |
| |
| class SkPath_RectPointIterator : public SkPath_PointIterator<4> { |
| public: |
| SkPath_RectPointIterator(const SkRect& rect, SkPath::Direction dir, unsigned startIndex) |
| : SkPath_PointIterator(dir, startIndex) { |
| |
| fPts[0] = SkPoint::Make(rect.fLeft, rect.fTop); |
| fPts[1] = SkPoint::Make(rect.fRight, rect.fTop); |
| fPts[2] = SkPoint::Make(rect.fRight, rect.fBottom); |
| fPts[3] = SkPoint::Make(rect.fLeft, rect.fBottom); |
| } |
| }; |
| |
| class SkPath_OvalPointIterator : public SkPath_PointIterator<4> { |
| public: |
| SkPath_OvalPointIterator(const SkRect& oval, SkPath::Direction dir, unsigned startIndex) |
| : SkPath_PointIterator(dir, startIndex) { |
| |
| const SkScalar cx = oval.centerX(); |
| const SkScalar cy = oval.centerY(); |
| |
| fPts[0] = SkPoint::Make(cx, oval.fTop); |
| fPts[1] = SkPoint::Make(oval.fRight, cy); |
| fPts[2] = SkPoint::Make(cx, oval.fBottom); |
| fPts[3] = SkPoint::Make(oval.fLeft, cy); |
| } |
| }; |
| |
| class SkPath_RRectPointIterator : public SkPath_PointIterator<8> { |
| public: |
| SkPath_RRectPointIterator(const SkRRect& rrect, SkPath::Direction dir, unsigned startIndex) |
| : SkPath_PointIterator(dir, startIndex) { |
| |
| const SkRect& bounds = rrect.getBounds(); |
| const SkScalar L = bounds.fLeft; |
| const SkScalar T = bounds.fTop; |
| const SkScalar R = bounds.fRight; |
| const SkScalar B = bounds.fBottom; |
| |
| fPts[0] = SkPoint::Make(L + rrect.radii(SkRRect::kUpperLeft_Corner).fX, T); |
| fPts[1] = SkPoint::Make(R - rrect.radii(SkRRect::kUpperRight_Corner).fX, T); |
| fPts[2] = SkPoint::Make(R, T + rrect.radii(SkRRect::kUpperRight_Corner).fY); |
| fPts[3] = SkPoint::Make(R, B - rrect.radii(SkRRect::kLowerRight_Corner).fY); |
| fPts[4] = SkPoint::Make(R - rrect.radii(SkRRect::kLowerRight_Corner).fX, B); |
| fPts[5] = SkPoint::Make(L + rrect.radii(SkRRect::kLowerLeft_Corner).fX, B); |
| fPts[6] = SkPoint::Make(L, B - rrect.radii(SkRRect::kLowerLeft_Corner).fY); |
| fPts[7] = SkPoint::Make(L, T + rrect.radii(SkRRect::kUpperLeft_Corner).fY); |
| } |
| }; |
| |
| #endif |