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