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      1 /*
      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 
     22 class SkCullPoints {
     23 public:
     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 
     42 private:
     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 
     53 class 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 */
     60 class SkCullPointsPath {
     61 public:
     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 
     70 private:
     71     SkCullPoints    fCP;
     72     SkPath*         fPath;
     73 };
     74 
     75 #endif
     76