124 lines
3.2 KiB
C
124 lines
3.2 KiB
C
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/* @doc INTERNAL
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*
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* @module _OSDC.H Off Screen DC class |
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*
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* Define class for off screen DC
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*
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* Original Author: <nl>
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* Ricksa
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*
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* History: <nl>
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* 1/11/96 ricksa Created
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*
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* Copyright (c) 1996-1998, Microsoft Corporation. All rights reserved.
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*/
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#ifndef __OSDC_H__
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#define __OSDC_H__
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/*
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* COffScreenDC
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*
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* @class The COffScreenDC is a helper that creates, fills and destroys
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* an off screen DC and its bitmaps.
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*
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*/
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class COffScreenDC
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{
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//@access Public Methods
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public:
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//@cmember Constructor - create null object.
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COffScreenDC() {_hdc = NULL;}
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//@cmember Destructor - clean up allocated
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// resources if any.
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~COffScreenDC() {FreeData();}
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//@cmember Initialize data based on input DC
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HDC Init(HDC hdc, LONG xWidth, LONG yHeight, COLORREF crBackground);
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//@cmember Get DC for offscreen rendering
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HDC GetDC() {return _hdc;}
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//@cmember Fill bitmap associated with off
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// screen rendering with background color.
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void FillBitmap(LONG xWidth, LONG yHeight);
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//@cmember Render off screen bitmap to hdc
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void RenderBitMap(HDC hdc, LONG xLeft, LONG yTop, LONG xWidth, LONG yHeight);
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//@cmember Get a copy of a bitmap from hdc
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BOOL Get(HDC hdc, LONG xLeft, LONG yTop, LONG xWidth, LONG yHeight);
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//@cmember Reallocate bitmap for render
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BOOL Realloc(LONG xWidth, LONG yHeight);
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//@cmember Select in a palette
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void SelectPalette(HPALETTE hpa);
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//@access Private Methods
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private:
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//@cmember Free all data associated with object
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void FreeData();
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//@access Private Data
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private:
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HDC _hdc; //@cmember HDC for off screen DC
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HBITMAP _hbmpOld; //@cmember bitmap when DC created
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HBITMAP _hbmp; //@cmember compatible bitmap for render
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HPALETTE _hpalOld; //@cmember palette used by DC
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};
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/*
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* COffScreenDC::FillBitmap (xWidth, yHeight)
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*
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* @mfunc
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* Fill bitmap
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*/
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inline void COffScreenDC::FillBitmap(
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LONG xWidth, //@parm Width to fill with background color
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LONG yHeight) //@parm height to fill with background color
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{
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// Erase background
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RECT rcClient;
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rcClient.top = rcClient.left = 0;
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rcClient.right = xWidth;
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rcClient.bottom = yHeight;
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ExtTextOut(_hdc, 0, 0, ETO_OPAQUE, &rcClient, NULL, 0, NULL);
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}
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/*
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* COffScreenDC::RenderBitMap(hdc, xLeft, yTop, xWidth, yHeight)
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*
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* @mfunc
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* Render bitmap to input DC
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*/
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inline void COffScreenDC::RenderBitMap(
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HDC hdc, //@parm HDC to render to
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LONG xLeft, //@parm left position to start render
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LONG yTop, //@parm top top position to start render
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LONG xWidth, //@parm width to render
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LONG yHeight) //@parm height to render
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{
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BitBlt(hdc, xLeft, yTop, xWidth, yHeight, _hdc, 0, 0, SRCCOPY);
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}
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/*
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* COffScreenDC::Get(hdc, xLeft, yTop, xWidth, yHeight)
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*
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* @mfunc
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* Get a copy of a bitmap from another DC
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*
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* @rdesc
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* TRUE - succeeded
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* FALSE - Failed
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*/
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inline BOOL COffScreenDC::Get(
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HDC hdc, //@parm HDC to copy from
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LONG xLeft, //@parm left position of source bitmap
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LONG yTop, //@parm top top position of source bitmap
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LONG xWidth, //@parm width of bitmap
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LONG yHeight) //@parm height to bitmap
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{
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return BitBlt(_hdc, 0, 0, xWidth, yHeight, hdc, xLeft, yTop, SRCCOPY);
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}
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#endif __OSDC_H__
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