office-gobmx/include/drawinglayer/primitive2d/transformprimitive2d.hxx
Noel Grandin 8104d771b1 tdf#144052 reduce Primitive2D copying
when creating charts, by using a
    Primitive2DContainer&&
parameter in the GroupPrimitive2D constructor, which forces the call
sites to pass a temporary, and at most call sites, we can std::move in
an existing local variable.

Change-Id: I531970918800c6832ab606b5a4ff5fd2d47ccf5b
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/121844
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
2021-09-09 15:22:52 +02:00

75 lines
3 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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#pragma once
#include <drawinglayer/drawinglayerdllapi.h>
#include <drawinglayer/primitive2d/groupprimitive2d.hxx>
#include <basegfx/matrix/b2dhommatrix.hxx>
namespace drawinglayer::primitive2d
{
/** TransformPrimitive2D class
This is one of the basic grouping primitives and it provides
embedding a sequence of primitives (a geometry) into a
transformation. All renderers have to handle this, usually by
building a current transformation stack (linear combination)
and applying this to all to-be-rendered geometry. If not handling
this, the output will be mostly wrong since this primitive is
widely used.
It does transform by embedding an existing geometry into a
transformation as Child-content. This allows re-usage of the
refcounted Uno-Api primitives and their existing, buffered
decompositions.
It could e.g. be used to show a single object geometry in 1000
different, transformed states without the need to create those
thousand primitive contents.
*/
class DRAWINGLAYER_DLLPUBLIC TransformPrimitive2D final : public GroupPrimitive2D
{
private:
// the transformation to apply to the child geometry
basegfx::B2DHomMatrix maTransformation;
public:
/// constructor
TransformPrimitive2D(
const basegfx::B2DHomMatrix& rTransformation,
Primitive2DContainer&& rChildren);
/// data read access
const basegfx::B2DHomMatrix& getTransformation() const { return maTransformation; }
/// compare operator
virtual bool operator==(const BasePrimitive2D& rPrimitive) const override;
/// get range
virtual basegfx::B2DRange getB2DRange(const geometry::ViewInformation2D& rViewInformation) const override;
/// provide unique ID
virtual sal_uInt32 getPrimitive2DID() const override;
};
} // end of namespace drawinglayer::primitive2d
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