reed | 026beb5 | 2015-06-10 14:23:15 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 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 | |
| 8 | #ifndef SkPathPriv_DEFINED |
| 9 | #define SkPathPriv_DEFINED |
| 10 | |
| 11 | #include "SkPath.h" |
| 12 | |
| 13 | class SkPathPriv { |
| 14 | public: |
| 15 | enum FirstDirection { |
| 16 | kCW_FirstDirection, // == SkPath::kCW_Direction |
| 17 | kCCW_FirstDirection, // == SkPath::kCCW_Direction |
| 18 | kUnknown_FirstDirection, |
| 19 | }; |
| 20 | |
| 21 | static FirstDirection AsFirstDirection(SkPath::Direction dir) { |
| 22 | // since we agree numerically for the values in Direction, we can just cast. |
| 23 | return (FirstDirection)dir; |
| 24 | } |
| 25 | |
| 26 | /** |
| 27 | * Return the opposite of the specified direction. kUnknown is its own |
| 28 | * opposite. |
| 29 | */ |
| 30 | static FirstDirection OppositeFirstDirection(FirstDirection dir) { |
| 31 | static const FirstDirection gOppositeDir[] = { |
halcanary | 9d524f2 | 2016-03-29 09:03:52 -0700 | [diff] [blame] | 32 | kCCW_FirstDirection, kCW_FirstDirection, kUnknown_FirstDirection, |
reed | 026beb5 | 2015-06-10 14:23:15 -0700 | [diff] [blame] | 33 | }; |
| 34 | return gOppositeDir[dir]; |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * Tries to quickly compute the direction of the first non-degenerate |
| 39 | * contour. If it can be computed, return true and set dir to that |
| 40 | * direction. If it cannot be (quickly) determined, return false and ignore |
| 41 | * the dir parameter. If the direction was determined, it is cached to make |
| 42 | * subsequent calls return quickly. |
| 43 | */ |
| 44 | static bool CheapComputeFirstDirection(const SkPath&, FirstDirection* dir); |
| 45 | |
| 46 | /** |
| 47 | * Returns true if the path's direction can be computed via |
| 48 | * cheapComputDirection() and if that computed direction matches the |
| 49 | * specified direction. If dir is kUnknown, returns true if the direction |
| 50 | * cannot be computed. |
| 51 | */ |
| 52 | static bool CheapIsFirstDirection(const SkPath& path, FirstDirection dir) { |
| 53 | FirstDirection computedDir = kUnknown_FirstDirection; |
| 54 | (void)CheapComputeFirstDirection(path, &computedDir); |
| 55 | return computedDir == dir; |
| 56 | } |
| 57 | |
ethannicholas | c88cb89 | 2015-12-15 11:01:12 -0800 | [diff] [blame] | 58 | static bool IsClosedSingleContour(const SkPath& path) { |
| 59 | int verbCount = path.countVerbs(); |
| 60 | if (verbCount == 0) |
| 61 | return false; |
| 62 | int moveCount = 0; |
| 63 | auto verbs = path.fPathRef->verbs(); |
| 64 | for (int i = 0; i < verbCount; i++) { |
| 65 | switch (verbs[~i]) { // verbs are stored backwards; we use [~i] to get the i'th verb |
| 66 | case SkPath::Verb::kMove_Verb: |
| 67 | moveCount += 1; |
| 68 | if (moveCount > 1) { |
| 69 | return false; |
| 70 | } |
| 71 | break; |
| 72 | case SkPath::Verb::kClose_Verb: |
| 73 | if (i == verbCount - 1) { |
| 74 | return true; |
| 75 | } |
| 76 | return false; |
| 77 | default: break; |
| 78 | } |
| 79 | } |
| 80 | return false; |
fmalita | bd5d7e7 | 2015-06-26 07:18:24 -0700 | [diff] [blame] | 81 | } |
senorblanco | 84cd621 | 2015-08-04 10:01:58 -0700 | [diff] [blame] | 82 | |
| 83 | static void AddGenIDChangeListener(const SkPath& path, SkPathRef::GenIDChangeListener* listener) { |
| 84 | path.fPathRef->addGenIDChangeListener(listener); |
| 85 | } |
bsalomon | edc743a | 2016-06-01 09:42:31 -0700 | [diff] [blame] | 86 | |
| 87 | /** |
| 88 | * This returns true for a rect that begins and ends at the same corner and has either a move |
| 89 | * followed by four lines or a move followed by 3 lines and a close. None of the parameters are |
| 90 | * optional. This does not permit degenerate line or point rectangles. |
| 91 | */ |
| 92 | static bool IsSimpleClosedRect(const SkPath& path, SkRect* rect, SkPath::Direction* direction, |
| 93 | unsigned* start); |
reed | 026beb5 | 2015-06-10 14:23:15 -0700 | [diff] [blame] | 94 | }; |
| 95 | |
| 96 | #endif |