sl@0: // Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: // For the Winscw Emulator only, selects between NGA and Non-NGA version of wsgraphicdrawer.
sl@0: // The default is the non-GCE based version.
sl@0: // To select the NGA version do one of:
sl@0: // 1. Add a line to the epoc.ini file in \epoc32\data like this:
sl@0: // symbian_graphics_use_gce ON
sl@0: // or
sl@0: // 2. Start epoc.exe with these parameters, (the "--" IS necessary):
sl@0: // -Dsymbian_graphics_use_gce=ON --
sl@0: // or
sl@0: // 3. epoc.exe can be told to switch to a different initialisation file than epoc.ini, with the -M parameter.
sl@0: // Progress chaining to the real Wserv is logged in epocwind.out.
sl@0: // 
sl@0: //
sl@0: 
sl@0: 
sl@0: 
sl@0: #include <emulator.h>
sl@0: 
sl@0: #include <e32svr.h>
sl@0: #include <u32hal.h>
sl@0: 
sl@0: 
sl@0: extern "C" {
sl@0: 
sl@0: #include "ws32_stubs.h"
sl@0: 
sl@0: FARPROC vector[MAX_ORDINAL+1];
sl@0: 
sl@0: #ifdef _DEBUG
sl@0: void Stop(char* aErrorMessage)
sl@0: #else
sl@0: void Stop(char* /*aErrorMessage*/)
sl@0: #endif
sl@0: 	{
sl@0: 	int err = GetLastError();
sl@0: #ifdef _DEBUG
sl@0: 	RDebug::Printf("%S, (last error = %i)", aErrorMessage, err);
sl@0: #endif
sl@0: 	_asm int 3;
sl@0: 	}
sl@0: 
sl@0: void fill_vector(HINSTANCE aDll)
sl@0: 	{
sl@0: 	int i;
sl@0: 	FARPROC address = NULL;
sl@0: 	for (i=1;i<=MAX_ORDINAL;i++)
sl@0: 		{
sl@0: 		address = GetProcAddress(aDll, (LPCSTR)i);
sl@0: 		if (address == NULL)
sl@0: 			{
sl@0: 			Stop("... has too few exported functions");
sl@0: 			}
sl@0: 		vector[i] = address;
sl@0: 		}
sl@0: 
sl@0: 	address = GetProcAddress(aDll, (LPCSTR)i);
sl@0: 	if (address != NULL)
sl@0: 		{
sl@0: 		Stop("... has too many exported functions");
sl@0: 		}
sl@0: 	vector[0] = (FARPROC)1;		// initialised
sl@0: 	}
sl@0: 
sl@0: // redirects DLL calls to GCE or non-GCE implementation
sl@0: void init_vector()
sl@0: 	{
sl@0: 	// ask HAL which configuration to use
sl@0: 	TBool nga = EFalse;
sl@0: 	UserSvr::HalFunction(EHalGroupEmulator, EEmulatorHalBoolProperty,  (TAny*)"symbian_graphics_use_gce",  &nga);
sl@0: 	const char* library = nga ? "ws32_nga.dll" : "ws32_nonnga.dll";
sl@0: #ifdef _DEBUG
sl@0: 	RDebug::Printf("Redirecting ws32.dll to \"%s\" ...\n", library);
sl@0: #endif
sl@0: 	Emulator::Escape();		// prevent deadlock between EKA2 scheduler and MS kernel
sl@0: 	// try to load selected DLL
sl@0: 	HINSTANCE instance = LoadLibraryA(library);
sl@0: 	Emulator::Reenter();
sl@0: 
sl@0: 	if (instance == NULL)
sl@0: 		{
sl@0: 		Stop("... unable to load");
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		fill_vector(instance);
sl@0: #ifdef _debug
sl@0: 		RDebug::Printf("... DLL loaded successfully");
sl@0: #endif
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: __declspec(naked) void common_dispatch()
sl@0: 	{
sl@0: 	_asm cmp	dword ptr vector,0		// initialised?
sl@0: 	_asm je  	do_init_vector
sl@0: call_though_vector:
sl@0: 	_asm jmp	[vector+eax*4]
sl@0: 
sl@0: do_init_vector:
sl@0: 	_asm push	eax
sl@0: 	_asm push	ecx
sl@0: 	_asm push	edx
sl@0: 	_asm call	init_vector
sl@0: 	_asm pop	edx
sl@0: 	_asm pop 	ecx
sl@0: 	_asm pop 	eax
sl@0: 	_asm jmp	call_though_vector
sl@0: 	}
sl@0: 
sl@0: }