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1 /*
2  * Copyright 2014 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 SkPatchUtils_DEFINED
9 #define SkPatchUtils_DEFINED
10 
11 #include "include/core/SkMatrix.h"
12 #include "include/private/SkColorData.h"
13 
14 class SkColorSpace;
15 class SkVertices;
16 
17 class SkPatchUtils {
18 
19 public:
20     // Enums for control points based on the order specified in the constructor (clockwise).
21     enum {
22         kNumCtrlPts = 12,
23         kNumCorners = 4,
24         kNumPtsCubic = 4
25     };
26 
27     /**
28      * Get the points corresponding to the top cubic of cubics.
29      */
30     static void GetTopCubic(const SkPoint cubics[12], SkPoint points[4]);
31 
32     /**
33      * Get the points corresponding to the bottom cubic of cubics.
34      */
35     static void GetBottomCubic(const SkPoint cubics[12], SkPoint points[4]);
36 
37     /**
38      * Get the points corresponding to the left cubic of cubics.
39      */
40     static void GetLeftCubic(const SkPoint cubics[12], SkPoint points[4]);
41 
42     /**
43      * Get the points corresponding to the right cubic of cubics.
44      */
45     static void GetRightCubic(const SkPoint cubics[12], SkPoint points[4]);
46 
47     /**
48      * Method that calculates a level of detail (number of subdivisions) for a patch in both axis.
49      */
50     static SkISize GetLevelOfDetail(const SkPoint cubics[12], const SkMatrix* matrix);
51 
52     static sk_sp<SkVertices> MakeVertices(const SkPoint cubics[12], const SkColor colors[4],
53                                           const SkPoint texCoords[4], int lodX, int lodY,
54                                           SkColorSpace* colorSpace = nullptr);
55 };
56 
57 #endif
58