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reed@android.com8a1c16f2008-12-17 15:59:43 +00001/*
2 * Copyright (C) 2006 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef SkCullPoints_DEFINED
18#define SkCullPoints_DEFINED
19
20#include "SkRect.h"
21
22class SkCullPoints {
23public:
24 SkCullPoints();
25 SkCullPoints(const SkIRect& r);
26
27 void reset(const SkIRect& r);
28
29 /** Start a contour at (x,y). Follow this with call(s) to lineTo(...)
30 */
31 void moveTo(int x, int y);
32
33 enum LineToResult {
34 kNo_Result, //!< line segment was completely clipped out
35 kLineTo_Result, //!< path.lineTo(pts[1]);
36 kMoveToLineTo_Result //!< path.moveTo(pts[0]); path.lineTo(pts[1]);
37 };
38 /** Connect a line to the previous call to lineTo (or moveTo).
39 */
40 LineToResult lineTo(int x, int y, SkIPoint pts[2]);
41
42private:
43 SkIRect fR; // the caller's rectangle
44 SkIPoint fAsQuad[4]; // cache of fR as 4 points
45 SkIPoint fPrevPt; // private state
46 LineToResult fPrevResult; // private state
47
48 bool sect_test(int x0, int y0, int x1, int y1) const;
49};
50
51/////////////////////////////////////////////////////////////////////////////////
52
53class SkPath;
54
55/** \class SkCullPointsPath
56
57 Similar to SkCullPoints, but this class handles the return values
58 from lineTo, and automatically builds a SkPath with the result(s).
59*/
60class SkCullPointsPath {
61public:
62 SkCullPointsPath();
63 SkCullPointsPath(const SkIRect& r, SkPath* dst);
64
65 void reset(const SkIRect& r, SkPath* dst);
66
67 void moveTo(int x, int y);
68 void lineTo(int x, int y);
69
70private:
71 SkCullPoints fCP;
72 SkPath* fPath;
73};
74
75#endif