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Diffstat (limited to '')
-rw-r--r-- | canvas/source/vcl/bitmapbackbuffer.hxx | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/canvas/source/vcl/bitmapbackbuffer.hxx b/canvas/source/vcl/bitmapbackbuffer.hxx new file mode 100644 index 000000000..fd2e45f51 --- /dev/null +++ b/canvas/source/vcl/bitmapbackbuffer.hxx @@ -0,0 +1,96 @@ +/* -*- 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 . + */ + +#ifndef INCLUDED_CANVAS_SOURCE_VCL_BITMAPBACKBUFFER_HXX +#define INCLUDED_CANVAS_SOURCE_VCL_BITMAPBACKBUFFER_HXX + +#include <vcl/virdev.hxx> +#include <vcl/bitmapex.hxx> + +#include <vclwrapper.hxx> +#include "outdevprovider.hxx" + +#include <memory> + +namespace vclcanvas +{ + /** Backbuffer implementation for canvas bitmap. + + This class abstracts away the renderable bitmap for the bitmap + canvas. The actual VirtualDevice is only created when + necessary, which makes read-only bitmaps a lot smaller. + */ + class BitmapBackBuffer : public OutDevProvider + { + public: + /** Create a backbuffer for given reference device + */ + BitmapBackBuffer( const BitmapEx& rBitmap, + const OutputDevice& rRefDevice ); + + virtual ~BitmapBackBuffer() override; + + virtual OutputDevice& getOutDev() override; + virtual const OutputDevice& getOutDev() const override; + + /// Clear the underlying bitmap to white, all transparent + void clear(); + + /** Exposing our internal bitmap. Only to be used from + CanvasBitmapHelper + + @internal + */ + BitmapEx& getBitmapReference(); + Size getBitmapSizePixel() const; + + private: + void createVDev() const; + void updateVDev() const; + + ::canvas::vcltools::VCLObject<BitmapEx> maBitmap; + mutable VclPtr<VirtualDevice> mpVDev; // created only on demand + + const OutputDevice& mrRefDevice; + + /** When true, the bitmap contains the last valid + content. When false, and mbVDevContentIsCurrent is true, + the VDev contains the last valid content (which must be + copied back to the bitmap, when getBitmapReference() is + called). When both are false, this object is just + initialized. + */ + mutable bool mbBitmapContentIsCurrent; + + /** When true, and mpVDev is non-NULL, the VDev contains the + last valid content. When false, and + mbBitmapContentIsCurrent is true, the bitmap contains the + last valid content. When both are false, this object is + just initialized. + */ + mutable bool mbVDevContentIsCurrent; + }; + + typedef std::shared_ptr< BitmapBackBuffer > BitmapBackBufferSharedPtr; + +} + +#endif // INCLUDED_CANVAS_SOURCE_VCL_BITMAPBACKBUFFER_HXX + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |