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195 lines
7.6 KiB
C++
195 lines
7.6 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Corporation code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef MOZILLA_GFX_PATH_CAIRO_H_
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#define MOZILLA_GFX_PATH_CAIRO_H_
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#include "2D.h"
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#include "cairo.h"
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namespace mozilla {
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namespace gfx {
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class DrawTargetCairo;
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// A reference to a cairo context that can maintain and set a path.
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//
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// This class exists to make it possible for us to not construct paths manually
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// using cairo_path_t, which in the common case is a speed and memory
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// optimization (as the cairo_t maintains the path for us, and we don't have to
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// use cairo_append_path). Instead, we can share a cairo_t with a DrawTarget,
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// and have it inform us when we need to make a copy of the path.
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//
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// Exactly one Path* object represents the current path on a given DrawTarget's
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// context. That Path* object registers its CairoPathContext with the
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// DrawTarget it's associated with. If that DrawTarget is going to change its
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// path, it has to tell the CairoPathContext beforehand so the path can be
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// saved off.
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// The path ownership is transferred to every new instance of CairoPathContext
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// in the constructor. We inform the draw target of the new context object,
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// which causes us to save off a copy of the path, as we're not going to be
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// informed upon changes any more.
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// Any transformation on aCtx is not applied to this path, though a path can be
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// transformed separately from its context by passing a matrix to the
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// constructor.
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class CairoPathContext : public RefCounted<CairoPathContext>
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{
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public:
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// Construct a CairoPathContext and set it to be the path observer of
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// aDrawTarget. Optionally, this path can be transformed by aMatrix.
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CairoPathContext(cairo_t* aCtx, DrawTargetCairo* aDrawTarget,
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FillRule aFillRule,
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const Matrix& aMatrix = Matrix());
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~CairoPathContext();
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// Copy the path on mContext to be the path on aToContext, if they aren't the
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// same.
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void CopyPathTo(cairo_t* aToContext);
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// This method must be called by the draw target before it changes the path
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// currently on the cairo context.
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void PathWillChange();
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// This method must be called by the draw target whenever it is going to
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// change the current transformation on mContext.
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void MatrixWillChange(const Matrix& aMatrix);
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// This method must be called as the draw target is dying. In this case, we
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// forget our reference to the draw target, and become the only reference to
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// our context.
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void ForgetDrawTarget();
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// Create a duplicate context, and copy this path to that context. Optionally,
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// the new context can be transformed.
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void DuplicateContextAndPath(const Matrix& aMatrix = Matrix());
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// Returns true if this CairoPathContext represents path.
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bool ContainsPath(const Path* path);
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cairo_t* GetContext() const { return mContext; }
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DrawTargetCairo* GetDrawTarget() const { return mDrawTarget; }
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Matrix GetTransform() const { return mTransform; }
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FillRule GetFillRule() const { return mFillRule; }
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operator cairo_t* () const { return mContext; }
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private: // methods
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CairoPathContext(const CairoPathContext&) MOZ_DELETE;
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private: // data
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Matrix mTransform;
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cairo_t* mContext;
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// Not a RefPtr to avoid cycles.
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DrawTargetCairo* mDrawTarget;
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FillRule mFillRule;
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};
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class PathBuilderCairo : public PathBuilder
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{
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public:
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// This constructor implicitly takes ownership of aCtx by calling
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// aDrawTarget->SetPathObserver(). Therefore, if the draw target has a path
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// observer, this constructor will cause it to copy out its path.
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// The path currently set on aCtx is not changed.
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PathBuilderCairo(cairo_t* aCtx, DrawTargetCairo* aDrawTarget, FillRule aFillRule);
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// This constructor, called with a CairoPathContext*, implicitly takes
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// ownership of the path, and therefore makes aPathContext copy out its path
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// regardless of whether it has a pointer to a DrawTargetCairo.
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// The path currently set on aPathContext is not changed.
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explicit PathBuilderCairo(CairoPathContext* aPathContext,
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const Matrix& aTransform = Matrix());
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virtual void MoveTo(const Point &aPoint);
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virtual void LineTo(const Point &aPoint);
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virtual void BezierTo(const Point &aCP1,
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const Point &aCP2,
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const Point &aCP3);
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virtual void QuadraticBezierTo(const Point &aCP1,
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const Point &aCP2);
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virtual void Close();
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virtual void Arc(const Point &aOrigin, float aRadius, float aStartAngle,
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float aEndAngle, bool aAntiClockwise = false);
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virtual Point CurrentPoint() const;
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virtual TemporaryRef<Path> Finish();
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TemporaryRef<CairoPathContext> GetPathContext();
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private: // methods
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void SetFillRule(FillRule aFillRule);
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private: // data
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RefPtr<CairoPathContext> mPathContext;
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FillRule mFillRule;
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};
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class PathCairo : public Path
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{
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public:
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PathCairo(cairo_t* aCtx, DrawTargetCairo* aDrawTarget, FillRule aFillRule, const Matrix& aTransform);
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virtual BackendType GetBackendType() const { return BACKEND_CAIRO; }
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virtual TemporaryRef<PathBuilder> CopyToBuilder(FillRule aFillRule = FILL_WINDING) const;
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virtual TemporaryRef<PathBuilder> TransformedCopyToBuilder(const Matrix &aTransform,
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FillRule aFillRule = FILL_WINDING) const;
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virtual bool ContainsPoint(const Point &aPoint, const Matrix &aTransform) const;
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virtual Rect GetBounds(const Matrix &aTransform = Matrix()) const;
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virtual Rect GetStrokedBounds(const StrokeOptions &aStrokeOptions,
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const Matrix &aTransform = Matrix()) const;
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virtual FillRule GetFillRule() const { return mFillRule; }
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TemporaryRef<CairoPathContext> GetPathContext();
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// Set this path to be the current path for aContext (if it's not already
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// aContext's path). You must pass the draw target associated with the
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// context as aDrawTarget.
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void CopyPathTo(cairo_t* aContext, DrawTargetCairo* aDrawTarget);
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private:
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RefPtr<CairoPathContext> mPathContext;
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FillRule mFillRule;
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};
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}
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}
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#endif /* MOZILLA_GFX_PATH_CAIRO_H_ */
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