gecko-dev/gfx/2d/PathCapture.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 MOZILLA_GFX_PATHCAPTURE_H_
#define MOZILLA_GFX_PATHCAPTURE_H_

#include "2D.h"
#include <vector>
#include <ostream>

#include "PathHelpers.h"

namespace mozilla {
namespace gfx {

class PathCapture;

class PathBuilderCapture : public PathBuilder {
 public:
  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(PathBuilderCapture, override)

  PathBuilderCapture(FillRule aFillRule, DrawTarget *aDT)
      : mFillRule(aFillRule), mDT(aDT) {}

  /* Move the current point in the path, any figure currently being drawn will
   * be considered closed during fill operations, however when stroking the
   * closing line segment will not be drawn.
   */
  virtual void MoveTo(const Point &aPoint) override;
  /* Add a linesegment to the current figure */
  virtual void LineTo(const Point &aPoint) override;
  /* Add a cubic bezier curve to the current figure */
  virtual void BezierTo(const Point &aCP1, const Point &aCP2,
                        const Point &aCP3) override;
  /* Add a quadratic bezier curve to the current figure */
  virtual void QuadraticBezierTo(const Point &aCP1, const Point &aCP2) override;
  /* Add an arc to the current figure */
  virtual void Arc(const Point &aOrigin, float aRadius, float aStartAngle,
                   float aEndAngle, bool aAntiClockwise) override;
  /* Close the current figure, this will essentially generate a line segment
   * from the current point to the starting point for the current figure
   */
  virtual void Close() override;

  /* Point the current subpath is at - or where the next subpath will start
   * if there is no active subpath.
   */
  virtual Point CurrentPoint() const override;

  virtual already_AddRefed<Path> Finish() override;

  virtual BackendType GetBackendType() const override {
    return BackendType::CAPTURE;
  }

 private:
  friend class PathCapture;

  FillRule mFillRule;
  std::vector<PathOp> mPathOps;
  Point mCurrentPoint;
  RefPtr<DrawTarget> mDT;
};

class PathCapture : public Path {
 public:
  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(PathCapture, override)

  PathCapture(const std::vector<PathOp> aOps, FillRule aFillRule,
              DrawTarget *aDT, const Point &aCurrentPoint)
      : mPathOps(aOps),
        mFillRule(aFillRule),
        mDT(aDT),
        mCurrentPoint(aCurrentPoint) {}

  virtual BackendType GetBackendType() const override {
    return BackendType::CAPTURE;
  }
  virtual already_AddRefed<PathBuilder> CopyToBuilder(
      FillRule aFillRule) const override;
  virtual already_AddRefed<PathBuilder> TransformedCopyToBuilder(
      const Matrix &aTransform, FillRule aFillRule) const override;
  virtual bool ContainsPoint(const Point &aPoint,
                             const Matrix &aTransform) const override;
  virtual bool StrokeContainsPoint(const StrokeOptions &aStrokeOptions,
                                   const Point &aPoint,
                                   const Matrix &aTransform) const override;

  virtual Rect GetBounds(const Matrix &aTransform = Matrix()) const override;

  virtual Rect GetStrokedBounds(
      const StrokeOptions &aStrokeOptions,
      const Matrix &aTransform = Matrix()) const override;

  virtual void StreamToSink(PathSink *aSink) const override;

  virtual FillRule GetFillRule() const override { return mFillRule; }

  Path *GetRealizedPath() const;

 private:
  bool EnsureRealizedPath() const;

  mutable RefPtr<Path> mRealizedPath;
  std::vector<PathOp> mPathOps;
  FillRule mFillRule;
  RefPtr<DrawTarget> mDT;
  Point mCurrentPoint;
};

}  // namespace gfx
}  // namespace mozilla

#endif /* MOZILLA_GFX_PATHCAPTURE_H_ */