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