145 lines
2.7 KiB
C++
145 lines
2.7 KiB
C++
/*
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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) 1995-1998, 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::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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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 PEGASUS
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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 PEGASUS
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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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DeleteObject(_hbmp);
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DeleteDC(_hdc);
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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,
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"COffScreenDC::Realloc CreateCompatibleBitmap failed");
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return FALSE;
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}
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// Select out old bitmap
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#if defined(DEBUG) || defined(_RELEASE_ASSERTS_)
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HBITMAP hbmpDebug = (HBITMAP)
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#endif // DEBUG
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SelectObject(_hdc, hbmpNew);
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AssertSz(hbmpDebug == _hbmp,
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"COffScreenDC::Realloc different bitmap");
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// Delete old bitmap
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DeleteObject(_hbmp);
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AssertSz(hbmpDebug == _hbmp,
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"COffScreenDC::Realloc Delete old bitmap failed");
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// Put in new bitmap
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_hbmp = hbmpNew;
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return TRUE;
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} |