158 lines
2.8 KiB
C++
158 lines
2.8 KiB
C++
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/*
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* @doc INTERNAL
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*
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* @module OSDC.CPP -- Off Screen DC class |
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*
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* This contains method used to implement the off screen
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* DC class
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*
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* Owner:<nl>
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* Rick Sailor
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*
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* Copyright (c) 1995-2000, Microsoft Corporation. All rights reserved.
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*/
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#include "_common.h"
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#include "_osdc.h"
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ASSERTDATA
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/*
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* COffscreenDC::GetDimensions(pdx, pdy)
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*
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* @mfunc
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* return the current height of the osdc
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*
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* @rdesc
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* height of the osdc
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*/
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void COffscreenDC::GetDimensions(long *pdx, long *pdy)
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{
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Assert(_hbmp);
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BITMAP bitmap;
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W32->GetObject(_hbmp, sizeof(BITMAP), &bitmap);
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*pdx = bitmap.bmWidth;
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*pdy = bitmap.bmHeight;
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}
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/*
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* COffscreenDC::Init(hdc, xWidth, yHeight, crBackground)
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*
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* @mfunc
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* Initialize off screen DC with compatible bitmap
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*
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* @rdesc
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* HDC created
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*/
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HDC COffscreenDC::Init(
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HDC hdc, //@parm DC to be compatible with
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LONG xWidth, //@parm Width of compatible bitmap
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LONG yHeight, //@parm Height of compatible bitmap
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COLORREF crBackground) //@parm Default background for bitmap
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{
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if (_hdc)
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return _hdc;
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HDC hdcRet = NULL; // HDC to return to caller
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_hbmpOld = NULL; // Assume failure
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_hbmp = NULL;
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_hpalOld = NULL;
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// Create memory DC
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_hdc = CreateCompatibleDC(hdc);
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if(_hdc)
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{
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// Create bitmap based on size of client rectangle
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_hbmp = CreateCompatibleBitmap(hdc, xWidth, yHeight);
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if(_hbmp)
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{
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// Select bitmap into hdc
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_hbmpOld = (HBITMAP)SelectObject(_hdc, _hbmp);
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if(_hbmpOld && SetBkColor(_hdc, crBackground) != CLR_INVALID)
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hdcRet = _hdc;
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}
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}
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if(!hdcRet)
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FreeData();
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return hdcRet;
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}
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/*
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* COffscreenDC::SelectPalette(hpal)
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*
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* @mfunc
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* Set a new palette into the hdc
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*/
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void COffscreenDC::SelectPalette(
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HPALETTE hpal) //@parm Handle to palette to set
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{
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#ifndef NOPALETTE
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if(hpal)
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{
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_hpalOld = ::SelectPalette(_hdc, hpal, TRUE);
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RealizePalette(_hdc);
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}
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#endif
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}
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/*
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* COffscreenDC::FreeData()
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*
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* @mfunc
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* Free resources associated with bitmap
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*/
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void COffscreenDC::FreeData()
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{
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if(_hdc)
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{
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#ifndef NOPALETTE
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if(_hpalOld)
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::SelectPalette(_hdc, _hpalOld, TRUE);
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#endif
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if(_hbmpOld)
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SelectObject(_hdc, _hbmpOld);
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if(_hbmp)
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{
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DeleteObject(_hbmp);
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_hbmp = NULL;
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}
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DeleteDC(_hdc);
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_hdc = NULL;
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}
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}
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/*
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* COffscreenDC::Realloc(xWidth, yHeight)
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*
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* @mfunc
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* Reallocate bitmap
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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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BOOL COffscreenDC::Realloc(
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LONG xWidth, //@parm Width of new bitmap
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LONG yHeight) //@parm Height of new bitmap
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{
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// Create bitmap based on size of client rectangle
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HBITMAP hbmpNew = CreateCompatibleBitmap(_hdc, xWidth, yHeight);
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if(!hbmpNew)
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{
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AssertSz(FALSE, "COffscreenDC::Realloc CreateCompatibleBitmap failed");
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return FALSE;
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}
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SelectObject(_hdc, hbmpNew);
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// Delete old bitmap
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DeleteObject(_hbmp);
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// Put in new bitmap
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_hbmp = hbmpNew;
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return TRUE;
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}
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