haiku-beta6/src/servers/app/drawing/DisplayDriver.cpp

//------------------------------------------------------------------------------
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//
//	File Name:		DisplayDriver.cpp
//	Author:			DarkWyrm <[email protected]>
//					Gabe Yoder <[email protected]>
//	Description:	Mostly abstract class which handles all graphics output
//					for the server
//  
//------------------------------------------------------------------------------
#include <stdio.h>
#include <string.h>

#include "CursorData.h"
#include "ServerCursor.h"

#include "DisplayDriver.h"

/*!
	\brief Sets up internal variables needed by all DisplayDriver subclasses
*/
DisplayDriver::DisplayDriver()
{
	fDisplayMode.virtual_width = 640;
	fDisplayMode.virtual_height = 480;
	fDisplayMode.space = B_RGBA32;
}

/*!
	\brief Does nothing
*/
DisplayDriver::~DisplayDriver()
{
}

/*!
	\brief Initializes the driver object.
	\return true if successful, false if not
	
	Initializes the CursorHandler with the default system cursor.

	Derived versions should set up the driver for display,
	including the initial clearing of the screen. If things
	do not go as they should, false should be returned.
*/
bool
DisplayDriver::Initialize()
{
	SetCursor(new ServerCursor(default_cursor_data));
	return true;
}

/*!
	\brief Shuts down the driver's video subsystem
	
	Any work done by Initialize() should be undone here. Note that Shutdown() is
	called even if Initialize() was unsuccessful.
*/
void
DisplayDriver::Shutdown()
{
}

/*
	\brief Sets the screen mode to specified resolution and color depth.
	\param mode Data structure as defined in Screen.h
	
	Subclasses must include calls to _SetDepth, _SetHeight, _SetWidth, and _SetMode
	to update the state variables kept internally by the DisplayDriver class.
*/
void
DisplayDriver::SetMode(const display_mode &mode)
{
	if (Lock()) {
		fDisplayMode = mode;
		Unlock();
	}
}

// GetMode
void
DisplayDriver::GetMode(display_mode *mode)
{
	if (!mode)
		return;
	
	if (Lock()) {
		*mode = fDisplayMode;
		Unlock();
	}
}