mirror of
https://code.videolan.org/videolan/vlc
synced 2024-10-07 03:56:28 +02:00
163 lines
4.4 KiB
C++
163 lines
4.4 KiB
C++
/*****************************************************************************
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* utils.cpp: ActiveX control for VLC
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*****************************************************************************
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* Copyright (C) 2005 the VideoLAN team
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*
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* Authors: Damien Fouilleul <Damien.Fouilleul@laposte.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#include "utils.h"
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/*
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** conversion facilities
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*/
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using namespace std;
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char *CStrFromBSTR(UINT codePage, BSTR bstr)
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{
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UINT len = SysStringLen(bstr);
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if( len > 0 )
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{
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size_t mblen = WideCharToMultiByte(codePage,
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0, bstr, len, NULL, 0, NULL, NULL);
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if( mblen > 0 )
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{
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char *buffer = (char *)CoTaskMemAlloc(mblen+1);
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ZeroMemory(buffer, mblen+1);
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if( WideCharToMultiByte(codePage, 0, bstr, len, buffer, mblen, NULL, NULL) )
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{
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buffer[mblen] = '\0';
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return buffer;
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}
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}
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}
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return NULL;
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};
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BSTR BSTRFromCStr(UINT codePage, LPCSTR s)
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{
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int wideLen = MultiByteToWideChar(codePage, 0, s, -1, NULL, 0);
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if( wideLen > 0 )
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{
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WCHAR* wideStr = (WCHAR*)CoTaskMemAlloc(wideLen*sizeof(WCHAR));
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if( NULL != wideStr )
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{
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BSTR bstr;
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ZeroMemory(wideStr, wideLen*sizeof(WCHAR));
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MultiByteToWideChar(codePage, 0, s, -1, wideStr, wideLen);
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bstr = SysAllocStringLen(wideStr, wideLen);
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free(wideStr);
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return bstr;
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}
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}
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return NULL;
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};
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/*
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** properties
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*/
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HRESULT GetObjectProperty(LPUNKNOWN object, DISPID dispID, VARIANT& v)
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{
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IDispatch *pDisp;
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HRESULT hr = object->QueryInterface(IID_IDispatch, (LPVOID *)&pDisp);
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if( SUCCEEDED(hr) )
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{
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DISPPARAMS dispparamsNoArgs = {NULL, NULL, 0, 0};
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VARIANT vres;
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VariantInit(&vres);
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hr = pDisp->Invoke(dispID, IID_NULL, LOCALE_USER_DEFAULT,
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DISPATCH_PROPERTYGET, &dispparamsNoArgs, &vres, NULL, NULL);
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if( SUCCEEDED(hr) )
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{
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if( V_VT(&v) != V_VT(&vres) )
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{
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hr = VariantChangeType(&v, &vres, 0, V_VT(&v));
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VariantClear(&vres);
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}
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else
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{
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v = vres;
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}
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}
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pDisp->Release();
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}
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return hr;
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};
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HDC CreateDevDC(DVTARGETDEVICE *ptd)
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{
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HDC hdc=NULL;
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LPDEVNAMES lpDevNames;
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LPDEVMODE lpDevMode;
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LPTSTR lpszDriverName;
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LPTSTR lpszDeviceName;
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LPTSTR lpszPortName;
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if (ptd == NULL) {
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hdc = CreateDC(TEXT("DISPLAY"), NULL, NULL, NULL);
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goto errReturn;
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}
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lpDevNames = (LPDEVNAMES) ptd; // offset for size field
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if (ptd->tdExtDevmodeOffset == 0) {
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lpDevMode = NULL;
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}else{
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lpDevMode = (LPDEVMODE) ((LPTSTR)ptd + ptd->tdExtDevmodeOffset);
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}
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lpszDriverName = (LPTSTR) lpDevNames + ptd->tdDriverNameOffset;
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lpszDeviceName = (LPTSTR) lpDevNames + ptd->tdDeviceNameOffset;
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lpszPortName = (LPTSTR) lpDevNames + ptd->tdPortNameOffset;
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hdc = CreateDC(lpszDriverName, lpszDeviceName, lpszPortName, lpDevMode);
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errReturn:
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return hdc;
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};
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#define HIMETRIC_PER_INCH 2540
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void DPFromHimetric(HDC hdc, LPPOINT pt, int count)
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{
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LONG lpX = GetDeviceCaps(hdc, LOGPIXELSX);
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LONG lpY = GetDeviceCaps(hdc, LOGPIXELSY);
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while( count-- )
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{
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pt->x = pt->x*lpX/HIMETRIC_PER_INCH;
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pt->y = pt->y*lpY/HIMETRIC_PER_INCH;
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++pt;
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}
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};
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void HimetricFromDP(HDC hdc, LPPOINT pt, int count)
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{
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LONG lpX = GetDeviceCaps(hdc, LOGPIXELSX);
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LONG lpY = GetDeviceCaps(hdc, LOGPIXELSY);
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while( count-- )
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{
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pt->x = pt->x*HIMETRIC_PER_INCH/lpX;
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pt->y = pt->y*HIMETRIC_PER_INCH/lpY;
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++pt;
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}
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};
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