experimental path-builder

include/core/SkPathBuilder.h

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkROPath_DEFINED
+#define SkROPath_DEFINED
+
+#include "SkMatrix.h"
+#include "SkTDArray.h"
+#include "SkRefCnt.h"
+
+#if 0
+class SkReader32;
+class SkWriter32;
+class SkString;
+class SkRRect;
+class SkWStream;
+
+enum SkPathFillType {
+    /** Specifies that "inside" is computed by a non-zero sum of signed edge crossings */
+    kWinding_SkPathFillType,
+    /** Specifies that "inside" is computed by an odd number of edge crossings */
+    kEvenOdd_SkPathFillType,
+    /** Same as Winding, but draws outside of the path, rather than inside */
+    kInverseWinding_SkPathFillType,
+    /** Same as EvenOdd, but draws outside of the path, rather than inside */
+    kInverseEvenOdd_SkPathFillType
+};
+
+static inline bool SkPathFillTypeIsInverse(SkPathFillType ft) {
+    return SkToBool(ft & 2);
+}
+
+enum SkPathConvexityType {
+    kUnknown_SkPathConvexityType,
+    kConvex_SkPathConvexityType,
+    kConcave_SkPathConvexityType
+};
+
+enum SkPathDirection {
+    /** Direction either has not been or could not be computed */
+    kUnknown_SkPathDirection,
+    /** clockwise direction for adding closed contours */
+    kCW_SkPathDirection,
+    /** counter-clockwise direction for adding closed contours */
+    kCCW_SkPathDirection,
+};
+
+enum SkPathSegmentMask {
+    kLine_SkPathSegmentMask   = 1 << 0,
+    kQuad_SkPathSegmentMask   = 1 << 1,
+    kConic_SkPathSegmentMask  = 1 << 2,
+    kCubic_SkPathSegmentMask  = 1 << 3,
+};
+
+enum SkPathVerb {
+    kMove_SkPathVerb,   //!< iter.next returns 1 point
+    kLine_SkPathVerb,   //!< iter.next returns 2 points
+    kQuad_SkPathVerb,   //!< iter.next returns 3 points
+    kConic_SkPathVerb,  //!< iter.next returns 3 points + iter.conicWeight()
+    kCubic_SkPathVerb,  //!< iter.next returns 4 points
+    kClose_SkPathVerb,  //!< iter.next returns 1 point (contour's moveTo pt)
+    kDone_SkPathVerb,   //!< iter.next returns 0 points
+};
+
+class SkPathBuilder {
+public:
+    SkROPath* finish();
+    
+    void incReserve(int extraPtCount);
+    
+    void moveTo(SkPoint pt);
+    void lineTo(SkPoint pt);
+    void quadTo(SkPoint pt1, SkPoint pt2);
+    void conicTo(SkPoint pt1, SkPoint pt2, SkScalar w);
+    void cubicTo(SkPoint pt1, SkPoint pt2, SkPoint pt3);
+    void close();
+
+    void moveTo(SkScalar x, SkScalar y) { this->moveTo(SkPoint::Make(x, y)); }
+    void lineTo(SkScalar x, SkScalar y) { this->lineTo(SkPoint::Make(x, y)); }
+    void quadTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2) {
+        this->quadTo(SkPoint::Make(x1, y1), SkPoint::Make(x2, y2));
+    }
+    void quadTo(const SkPoint pts[2]) { this->quadTo(pts[0], pts[1]); }
+    void conicTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2, SkScalar w) {
+        this->conicTo(SkPoint::Make(x1, y1), SkPoint::Make(x2, y2), w);
+    }
+    void conicTo(const SkPoint pts[2], SkScalar w) {
+        this->conicTo(pts[0], pts[1], w);
+    }
+    void cubicTo(SkScalar x1, SkScalar y1, SkScalar x2, SkScalar y2, SkScalar x3, SkScalar y3) {
+        this->cubicTo(SkPoint::Make(x1, y1), SkPoint::Make(x2, y2), SkPoint::Make(x3, y3));
+    }
+    void cubicTo(const SkPoint pts[3]) {
+        this->cubicTo(pts[0], pts[1], pts[2]);
+    }
+    
+    void addRect(const SkRect&, SkPathDirection dir = kCW_PathDirection);
+    void addOval(const SkRect&, SkPathDirection dir = kCW_PathDirection);
+    void addRRect(const SkRRect&, SkPathDirection dir = kCW_PathDirection);
+
+private:
+    SkTDArray<SkPoint>  fPts;
+    SkTDArray<char>     fVerbs;
+    SkROPath*           fCachedPath;
+};
+
+#endif
+#endif