gecko-dev/gfx/thebes/gfxPath.h

65 lines
1.5 KiB
C++

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef GFX_PATH_H
#define GFX_PATH_H
#include "gfxTypes.h"
#include "nsISupportsImpl.h"
class gfxContext;
struct gfxPoint;
typedef struct cairo_path cairo_path_t;
/**
* Class representing a path. Can be created by copying the current path
* of a gfxContext.
*/
class gfxPath {
NS_INLINE_DECL_REFCOUNTING(gfxPath)
friend class gfxContext;
protected:
gfxPath(cairo_path_t* aPath);
public:
virtual ~gfxPath();
protected:
cairo_path_t* mPath;
};
/**
* Specialization of a path that only contains linear pieces. Can be created
* from the existing path of a gfxContext.
*/
class gfxFlattenedPath : public gfxPath {
friend class gfxContext;
protected:
gfxFlattenedPath(cairo_path_t* aPath);
public:
virtual ~gfxFlattenedPath();
/**
* Returns calculated total length of path
*/
gfxFloat GetLength();
/**
* Returns a point a certain distance along the path. Return is
* first or last point of the path if the requested length offset
* is outside the range for the path.
* @param aOffset offset inpath parameter space (x=length, y=normal offset)
* @param aAngle optional - output tangent
*/
gfxPoint FindPoint(gfxPoint aOffset,
gfxFloat* aAngle = nullptr);
};
#endif