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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* 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/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you 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 .
*/
#pragma once
#include <drawinglayer/drawinglayerdllapi.h>
#include <drawinglayer/primitive2d/Primitive2DContainer.hxx>
#include <drawinglayer/primitive2d/Primitive2DVisitor.hxx>
#include <cppuhelper/compbase.hxx>
#include <drawinglayer/primitive2d/DeviceDependentServices.hxx>
#include <com/sun/star/util/XAccounting.hpp>
#include <cppuhelper/basemutex.hxx>
#include <basegfx/range/b2drange.hxx>
#include <com/sun/star/graphic/XPrimitive2D.hpp>
#include <drawinglayer/geometry/viewinformation2d.hxx>
namespace drawinglayer::primitive2d
{
class DRAWINGLAYERCORE_DLLPUBLIC VisitingParameters
{
private:
geometry::ViewInformation2D maViewInformation;
public:
explicit VisitingParameters(const geometry::ViewInformation2D& rViewInformation)
: maViewInformation(rViewInformation)
{
}
const css::uno::Sequence<css::beans::PropertyValue> getUnoProperties()
{
css::uno::Sequence<css::beans::PropertyValue> aPropertyValues;
aPropertyValues = maViewInformation.getViewInformationSequence();
return aPropertyValues;
}
const geometry::ViewInformation2D& getViewInformation() const { return maViewInformation; }
};
typedef cppu::WeakComponentImplHelper<css::graphic::XPrimitive2D, css::util::XAccounting>
BasePrimitive2DImplBase;
/** BasePrimitive2D class
Baseclass for all C++ implementations of css::graphic::XPrimitive2D
This class is strongly virtual due to the lack of getPrimitiveID() implementation.
This is by purpose, this base class shall not be incarnated and be used directly as
a XPrimitive2D.
It is noncopyable to make clear that a primitive is a read-only
instance and copying or changing values is not intended. The idea is to hold all data
needed for visualisation of this primitive in unchangeable form.
It is derived from cppu::BaseMutex to have a Mutex at hand; in a base
implementation this may not be needed, but e.g. when buffering at last decomposition
in a local member, multiple threads may try to decompose at the same time, so locking
is needed to avoid race conditions seen from the UNO object implementation.
A method to get a simplified representation is provided by get2DDecomposition. The
default implementation returns an empty sequence. The idea is that processors
using this primitive and do not know it, may get the decomposition and process
these instead. An example is e.g. a fat line, who's decomposition may contain
the geometric representation of that line using filled polygon primitives. When
the renderer knows how to handle fat lines, he may process this primitive directly;
if not he can use the decomposition. With this functionality, renderers may operate by
knowing only a small set of primitives.
When a primitive does not implement get2DDecomposition, it is called a 'Basic Primitive' and
belongs to the set of primitives which a processor should be able to handle. Practice
will define this minimal sets of primitives. When defined and the concept is proved,
unique UNO APIs may be defined/implemented for these set to allow more intense work
with primitives using UNO.
Current Basic 2D Primitives are:
- BitmapPrimitive2D (bitmap data, evtl. with transparence)
- PointArrayPrimitive2D (single points)
- PolygonHairlinePrimitive2D (hairline curves/polygons)
- PolyPolygonColorPrimitive2D (colored polygons)
UPDATE: MetafilePrimitive2D (VCL Metafile) is taken off this list since
it is implemented with the integration of CWS aw078 into DV300m69.
All other implemented primitives have a defined decomposition and can thus be
decomposed down to this small set.
A renderer implementing support for this minimal set of primitives can completely
render primitive-based visualisations. Of course, he also has to take states into account
which are represented by GroupPrimitive2D derivations, see groupprimitive2d.hxx
To support getting the geometric BoundRect, getB2DRange is used. The default
implementation will use the get2DDecomposition result and merge a range from the
entries. Thus, an implementation is only necessary for the Basic Primitives, but
of course speedups are possible (and are used) by implementing the method at higher-level
primitives.
For primitive identification, getPrimitiveID is used currently in this implementations
to allow a fast switch/case processing. This needs a unique identifier mechanism which
currently uses defines (see drawinglayer_primitivetypes2d.hxx). For UNO primitive API
it will be needed to add a unique descriptor (Name?) later to the API.
This base implementation provides mappings from the methods from XPrimitive2D
(getDecomposition/getRange) to the appropriate methods in the C++ implementations
(get2DDecomposition/getB2DRange). The PropertyValue ViewParameters is converted to
the appropriate C++ implementation class ViewInformation2D.
This base class does not implement any buffering; e.g. buffering the decomposition
and/or the range. These may be buffered anytime since the definition is that the primitive
is read-only and thus unchangeable. This implies that the decomposition and/or getting
the range will lead to the same result as last time, under the precondition that
the parameter ViewInformation2D is the same as the last one. This is usually the case
for view-independent primitives which are defined by not using ViewInformation2D
in their get2DDecomposition/getB2DRange implementations.
*/
class DRAWINGLAYERCORE_DLLPUBLIC BasePrimitive2D : protected cppu::BaseMutex,
public BasePrimitive2DImplBase
{
BasePrimitive2D(const BasePrimitive2D&) = delete;
BasePrimitive2D& operator=(const BasePrimitive2D&) = delete;
public:
// constructor/destructor
BasePrimitive2D();
virtual ~BasePrimitive2D() override;
/** the ==operator is mainly needed to allow testing newly-created primitives against their last
incarnation which buffers/holds the made decompositions. The default implementation
uses getPrimitive2DID()-calls to test if it's the same ID at last.
Overridden implementations are then based on this implementation
*/
virtual bool operator==(const BasePrimitive2D& rPrimitive) const;
bool operator!=(const BasePrimitive2D& rPrimitive) const { return !operator==(rPrimitive); }
/// The default implementation will use getDecomposition results to create the range
virtual basegfx::B2DRange getB2DRange(VisitingParameters const& rParameters) const;
/** provide unique ID for fast identifying of known primitive implementations in renderers. These use
the defines from drawinglayer_primitivetypes2d.hxx to define unique IDs.
*/
virtual sal_uInt32 getPrimitive2DID() const = 0;
/// The default implementation will return an empty sequence
virtual void get2DDecomposition(Primitive2DDecompositionVisitor& rVisitor,
VisitingParameters const& rParameters) const;
// Methods from XPrimitive2D
/** The getDecomposition implementation for UNO API will use getDecomposition from this implementation. It
will construct a ViewInformation2D from the ViewParameters for that purpose
*/
virtual css::uno::Sequence<::css::uno::Reference<::css::graphic::XPrimitive2D>> SAL_CALL
getDecomposition(const css::uno::Sequence<css::beans::PropertyValue>& rViewParameters) override;
/** The getRange implementation for UNO API will use getRange from this implementation. It
will construct a ViewInformation2D from the ViewParameters for that purpose
*/
virtual css::geometry::RealRectangle2D SAL_CALL
getRange(const css::uno::Sequence<css::beans::PropertyValue>& rViewParameters) override;
// XAccounting
virtual sal_Int64 SAL_CALL estimateUsage() override;
};
} // end of namespace drawinglayer::primitive2d
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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