61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
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/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkPathPriv_DEFINED
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#define SkPathPriv_DEFINED
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#include "SkPath.h"
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class SkPathPriv {
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public:
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enum FirstDirection {
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kCW_FirstDirection, // == SkPath::kCW_Direction
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kCCW_FirstDirection, // == SkPath::kCCW_Direction
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kUnknown_FirstDirection,
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};
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static FirstDirection AsFirstDirection(SkPath::Direction dir) {
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// since we agree numerically for the values in Direction, we can just cast.
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return (FirstDirection)dir;
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}
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/**
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* Return the opposite of the specified direction. kUnknown is its own
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* opposite.
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*/
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static FirstDirection OppositeFirstDirection(FirstDirection dir) {
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static const FirstDirection gOppositeDir[] = {
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kCCW_FirstDirection, kCW_FirstDirection, kUnknown_FirstDirection,
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};
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return gOppositeDir[dir];
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}
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/**
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* Tries to quickly compute the direction of the first non-degenerate
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* contour. If it can be computed, return true and set dir to that
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* direction. If it cannot be (quickly) determined, return false and ignore
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* the dir parameter. If the direction was determined, it is cached to make
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* subsequent calls return quickly.
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*/
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static bool CheapComputeFirstDirection(const SkPath&, FirstDirection* dir);
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/**
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* Returns true if the path's direction can be computed via
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* cheapComputDirection() and if that computed direction matches the
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* specified direction. If dir is kUnknown, returns true if the direction
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* cannot be computed.
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*/
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static bool CheapIsFirstDirection(const SkPath& path, FirstDirection dir) {
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FirstDirection computedDir = kUnknown_FirstDirection;
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(void)CheapComputeFirstDirection(path, &computedDir);
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return computedDir == dir;
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}
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};
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#endif
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