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/* include/graphics/SkCullPoints.h
**
** Copyright 2006, Google Inc.
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#ifndef SkCullPoints_DEFINED
#define SkCullPoints_DEFINED
#include "SkRect.h"
class SkCullPoints {
public:
SkCullPoints();
SkCullPoints(const SkIRect& r);
void reset(const SkIRect& r);
/** Start a contour at (x,y). Follow this with call(s) to lineTo(...)
*/
void moveTo(int x, int y);
enum LineToResult {
kNo_Result, //!< line segment was completely clipped out
kLineTo_Result, //!< path.lineTo(pts[1]);
kMoveToLineTo_Result //!< path.moveTo(pts[0]); path.lineTo(pts[1]);
};
/** Connect a line to the previous call to lineTo (or moveTo).
*/
LineToResult lineTo(int x, int y, SkIPoint pts[2]);
private:
SkIRect fR; // the caller's rectangle
SkIPoint fAsQuad[4]; // cache of fR as 4 points
SkIPoint fPrevPt; // private state
LineToResult fPrevResult; // private state
bool sect_test(int x0, int y0, int x1, int y1) const;
};
/////////////////////////////////////////////////////////////////////////////////
class SkPath;
/** \class SkCullPointsPath
Similar to SkCullPoints, but this class handles the return values
from lineTo, and automatically builds a SkPath with the result(s).
*/
class SkCullPointsPath {
public:
SkCullPointsPath();
SkCullPointsPath(const SkIRect& r, SkPath* dst);
void reset(const SkIRect& r, SkPath* dst);
void moveTo(int x, int y);
void lineTo(int x, int y);
private:
SkCullPoints fCP;
SkPath* fPath;
};
#endif
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