| /************************************************************** |
| * |
| * 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 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| *************************************************************/ |
| |
| |
| |
| #ifndef _VCLCANVAS_BITMAPBACKBUFFER_HXX_ |
| #define _VCLCANVAS_BITMAPBACKBUFFER_HXX_ |
| |
| #include <vcl/virdev.hxx> |
| #include <vcl/bitmapex.hxx> |
| |
| #include <canvas/vclwrapper.hxx> |
| #include "outdevprovider.hxx" |
| |
| #include <boost/shared_ptr.hpp> |
| |
| |
| 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 ); |
| |
| ~BitmapBackBuffer(); |
| |
| virtual OutputDevice& getOutDev(); |
| virtual const OutputDevice& getOutDev() const; |
| |
| /// 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 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 ::boost::shared_ptr< BitmapBackBuffer > BitmapBackBufferSharedPtr; |
| |
| } |
| |
| #endif /* #ifndef _VCLCANVAS_BITMAPBACKBUFFER_HXX_ */ |
| |