162 lines
3.8 KiB
C
162 lines
3.8 KiB
C
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#include <windows.h>
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#undef WINAPI
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#define WINAPI FAR PASCAL _loadds
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#include "dciman.h"
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static char szSystemIni[] = "system.ini";
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static char szWinIni[] = "win.ini";
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static char szDrivers[] = "Drivers";
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static char szDrawDib[] = "DrawDib";
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static char szDCI[] = "dci";
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static char szDVA[] = "dva";
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static char szDISPLAY[] = "display";
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static char szDCISVGA[] = "dcisvga";
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static char szDCIDVA[] = "dcidva";
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static BOOL fDVA;
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extern LONG DVAEscape(HDC hdc, UINT function, UINT size, LPVOID lp_in_data, LPVOID lp_out_data);
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/****************************************************************************
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***************************************************************************/
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#define USE_DCI_EQUALS 0x01
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#define USE_DRIVER 0x02
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#define USE_DCISVGA 0x04
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HDC WINAPI DCIOpenProvider(void)
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{
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char ach[128];
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HDC hdc;
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UINT u;
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int dva;
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int dcidva;
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BOOL try_dcisvga = 0;
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BOOL try_display = 0;
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BOOL try_driver = 0;
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//
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// get dcidva variable.
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// 1 = use DCI= line
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// 2 = use display drivetr
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// 4 = use DCISVGA
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//
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dcidva = USE_DCI_EQUALS | USE_DRIVER | USE_DCISVGA;
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dcidva = GetPrivateProfileInt( szDrawDib, szDCIDVA, dcidva, szWinIni );
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if( dcidva == 0 ) {
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return NULL;
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}
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/*
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* get the DCI provider, order of attempts
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* 1) try DCI=
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* 2) try display driver
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* 3) try DCISVGA
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*/
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if( dcidva & USE_DCI_EQUALS ) {
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GetPrivateProfileString(szDrivers, szDCI, "", ach, sizeof(ach), szSystemIni);
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} else if( dcidva & USE_DRIVER ) {
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try_driver = 1;
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lstrcpy( ach,szDISPLAY );
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} else {
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try_dcisvga = 1;
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lstrcpy( ach,szDCISVGA );
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}
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again:
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u = SetErrorMode(SEM_NOOPENFILEERRORBOX);
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hdc = CreateDC(ach, NULL, NULL, NULL);
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SetErrorMode(u);
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if (hdc == NULL)
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{
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fail:
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if( try_dcisvga ) {
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goto LastResort;
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}
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if( !try_driver ) {
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if( dcidva & USE_DRIVER ) {
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try_driver = 1;
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lstrcpy(ach, szDISPLAY);
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} else if( dcidva & USE_DCISVGA ) {
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try_dcisvga = 1;
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lstrcpy(ach, szDCISVGA);
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} else {
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goto LastResort;
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}
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} else {
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if( dcidva & USE_DCISVGA ) {
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try_dcisvga = 1;
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lstrcpy(ach, szDCISVGA);
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} else {
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goto LastResort;
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}
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}
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goto again;
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}
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//
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// now check for the Escape. If not, continue looping
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//
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u = DCICOMMAND;
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if (Escape(hdc, QUERYESCSUPPORT,sizeof(u),(LPCSTR)&u,NULL) == 0)
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{
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DeleteDC(hdc);
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goto fail;
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}
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return hdc;
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LastResort:
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//
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// driver does not do escape, punt it, try old DVA first though
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//
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if (DVAEscape(hdc,QUERYESCSUPPORT,sizeof(u),(LPVOID)&u,NULL) != 0)
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{
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fDVA = TRUE;
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return hdc;
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}
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return NULL;
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}
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/****************************************************************************
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***************************************************************************/
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void WINAPI DCICloseProvider(HDC hdc)
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{
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if (hdc)
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DeleteDC(hdc);
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}
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/****************************************************************************
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***************************************************************************/
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int WINAPI DCISendCommand(HDC hdc, DCICMD FAR *pcmd, VOID FAR * FAR * lplpOut)
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{
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if (lplpOut) // in case it fails, make sure this is NULL
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*lplpOut = NULL;
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if (fDVA)
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return DVAEscape(hdc, DCICOMMAND, sizeof(DCICMD),(LPVOID)pcmd, lplpOut);
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else
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return Escape(hdc, DCICOMMAND, sizeof(DCICMD),(LPCSTR)pcmd, lplpOut);
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}
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/****************************************************************************
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***************************************************************************/
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extern int WINAPI DCICreatePrimary(HDC hdc, DCISURFACEINFO FAR * FAR *lplpSurface)
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{
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DCICMD cmd;
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cmd.dwCommand = DCICREATEPRIMARYSURFACE;
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cmd.dwParam1 = 0;
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cmd.dwParam2 = 0;
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cmd.dwVersion = DCI_VERSION;
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cmd.dwReserved = 0;
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return DCISendCommand(hdc, &cmd, lplpSurface);
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}
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