haiku-beta6/src/kits/interface/PrivateScreen.cpp

//------------------------------------------------------------------------------
//	Copyright (c) 2002-2005, Haiku
//
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//	Software is furnished to do so, subject to the following conditions:
//
//	The above copyright notice and this permission notice shall be included in
//	all copies or substantial portions of the Software.
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//	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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//	DEALINGS IN THE SOFTWARE.
//
//	File Name:		PrivateScreen.cpp
//	Author:			Stefano Ceccherini ([email protected])
//	Description:	BPrivateScreen is the class which does the real work
//					for the proxy class BScreen (it interacts with the app server).
//------------------------------------------------------------------------------
#include <Window.h>

#include <stdlib.h>

#include "AppServerLink.h"
#include "PrivateScreen.h"
#include "ServerProtocol.h"


// TODO: We should define this somewhere else
// We could find how R5 defines this, though it's not strictly necessary
// AFAIK, R5 here keeps also the screen width, height, colorspace, and some other things
// (it's 48 bytes big)
struct screen_desc {
	void *base_address;
	uint32 bytes_per_row;
};


// Defined in Application.cpp
namespace BPrivate {
extern BPrivateScreen *gPrivateScreen;
};


using namespace BPrivate;

BPrivateScreen *
BPrivateScreen::CheckOut(BWindow *win)
{
	// TODO: If we start supporting multiple monitors, we
	// should return the right screen for the passed BWindow
	return gPrivateScreen;
}


BPrivateScreen *
BPrivateScreen::CheckOut(screen_id id)
{
	// TODO: If we start supporting multiple monitors, we
	// should return the right object for the given screen_id
	return gPrivateScreen;
}


void
BPrivateScreen::Return(BPrivateScreen *screen)
{
	// Not much to do here. I guess it's some legacy from pre-R5,
	// where BScreen could not be used for long time,
	// as they blocked the BApplication
}

	
status_t
BPrivateScreen::SetToNext()
{
	// This function always returns B_ERROR
	return B_ERROR;
}

	
color_space
BPrivateScreen::ColorSpace()
{
	display_mode mode;
	if (GetMode(B_CURRENT_WORKSPACE, &mode) == B_OK)
		return (color_space)mode.space;
		
	return B_NO_COLOR_SPACE;
}


BRect
BPrivateScreen::Frame()
{
	// If something goes wrong, we just return this rectangle.
	BRect rect(0, 0, 0, 0);
	display_mode mode;
	if (GetMode(B_CURRENT_WORKSPACE, &mode) == B_OK)
		rect.Set(0, 0, (float)mode.virtual_width - 1, (float)mode.virtual_height - 1);
		
	return rect;
}


screen_id 
BPrivateScreen::ID()
{
	// TODO: Change this if we start supporting multiple screens
	return B_MAIN_SCREEN_ID;
}
	
	
status_t
BPrivateScreen::WaitForRetrace(bigtime_t timeout)
{
	// Get the retrace semaphore if it's the first time 
	// we are called. Cache the value then.
	status_t status;
	if (fRetraceSem == -1)
		fRetraceSem = RetraceSemaphore();

	do {
		status = acquire_sem_etc(fRetraceSem, 1, B_RELATIVE_TIMEOUT, timeout);
	} while (status == B_INTERRUPTED);

	return status;
}

	
sem_id
BPrivateScreen::RetraceSemaphore()
{
	sem_id id = B_BAD_SEM_ID;
	// TODO: Implement
	/*
	BAppServerLink link;
	PortMessage reply;
	link.SetOpCode(AS_GET_RETRACE_SEMAPHORE);
	link.Attach<screen_id>(ID());
	link.FlushWithReply(&reply);
	reply.Read<sem_id>(&id);
	*/
	return id;
}



uint8
BPrivateScreen::IndexForColor(uint8 red, uint8 green, uint8 blue, uint8 alpha)
{
	// Looks like this check is necessary
	if (red == B_TRANSPARENT_COLOR.red && green == B_TRANSPARENT_COLOR.green &&
		blue == B_TRANSPARENT_COLOR.blue && alpha == B_TRANSPARENT_COLOR.alpha)
		return B_TRANSPARENT_8_BIT;

	
	if (fColorMap)
		return fColorMap->index_map[((red & 0xf8) << 7)
								| ((green & 0xf8) << 2)
								| (blue >> 3)];

	return 0;
}


rgb_color
BPrivateScreen::ColorForIndex(const uint8 index)
{
	if (fColorMap)
		return fColorMap->color_list[index];

	return rgb_color();
}


uint8
BPrivateScreen::InvertIndex(uint8 index)
{
	if (fColorMap)
		return fColorMap->inversion_map[index];

	return 0;
}
	

const color_map *
BPrivateScreen::ColorMap()
{
	return fColorMap;
}


status_t
BPrivateScreen::GetBitmap(BBitmap **bitmap, bool drawCursor, BRect *bound)
{
	// TODO: Implement
	return B_ERROR;
}


status_t
BPrivateScreen::ReadBitmap(BBitmap *bitmap, bool drawCursor, BRect *bound)
{
	// TODO: Implement
	return B_ERROR;
}

		
rgb_color
BPrivateScreen::DesktopColor(uint32 workspace)
{
	rgb_color color;
	/*
	BAppServerLink link;
	PortMessage reply;
	link.SetOpCode(AS_GET_DESKTOP_COLOR);
	link.Attach<int32>(workspace);
	link.FlushWithReply(&reply);
	reply.Read<rgb_color>(&color);
	*/
	return color;
}


void
BPrivateScreen::SetDesktopColor(rgb_color color, uint32 workspace, bool makeDefault)
{
	/*
	BAppServerLink link;
	link.SetOpCode(AS_SET_DESKTOP_COLOR);
	link.Attach<rgb_color>(color);
	link.Attach<int32>(workspace);
	link.Attach<bool>(makeDefault);
	link.Flush();
	*/
}


status_t
BPrivateScreen::ProposeMode(display_mode *target, const display_mode *low, const display_mode *high)
{
	// TODO: Implement
	return B_ERROR;
}
		

status_t
BPrivateScreen::GetModeList(display_mode **mode_list, uint32 *count)
{
	// TODO: Implement
	return B_ERROR;
}


status_t
BPrivateScreen::GetMode(uint32 workspace, display_mode *mode)
{
	if (mode == NULL)
		return B_BAD_VALUE;
		
	BAppServerLink link;
	link.StartMessage(AS_SCREEN_GET_MODE);
	link.Attach<screen_id>(ID());
	link.Attach<uint32>(workspace);
	
	int32 code = SERVER_FALSE;
	link.FlushWithReply(&code);
	
	if (code != SERVER_TRUE)
		return B_ERROR;
	
	display_mode currentMode;
	link.Read<display_mode>(&currentMode);
	
	status_t status = B_ERROR;
	link.Read<status_t>(&status);
	if (status == B_OK && mode)
		*mode = currentMode; 
	
	return status;
}


status_t
BPrivateScreen::SetMode(uint32 workspace, display_mode *mode, bool makeDefault)
{
	if (mode == NULL)
		return B_BAD_VALUE;
		
	BAppServerLink link;
	link.StartMessage(AS_SCREEN_SET_MODE);
	link.Attach<screen_id>(ID());
	link.Attach<uint32>(workspace);
	link.Attach<display_mode>(*mode);
	link.Attach<bool>(makeDefault);
	
	int32 code = SERVER_FALSE;
	link.FlushWithReply(&code);
	
	status_t status = B_ERROR;
	if (code == SERVER_TRUE)
		link.Read<status_t>(&status);
	
	return status;
}


status_t
BPrivateScreen::GetDeviceInfo(accelerant_device_info *info)
{
	// TODO: Implement
	return B_ERROR;
}


status_t
BPrivateScreen::GetPixelClockLimits(display_mode *mode, uint32 *low, uint32 *high)
{
	// TODO: Implement
	return B_ERROR;
}


status_t
BPrivateScreen::GetTimingConstraints(display_timing_constraints *dtc)
{
	// TODO: Implement
	return B_ERROR;
}


status_t
BPrivateScreen::SetDPMS(uint32 dpmsState)
{
	status_t status = B_ERROR;
	/*
	BAppServerLink link;
	PortMessage reply;
	link.SetOpCode(AS_SET_DPMS);
	link.Attach<screen_id>(ID());
	link.Attach<uint32>(dpmsState);
	link.FlushWithReply(&reply);
	reply.Read<status_t>(&status);
	*/
	return status;
}


uint32
BPrivateScreen::DPMSState()
{
	// TODO: Implement
	uint32 state = 0;
	/*
	BAppServerLink link;
	PortMessage reply;
	link.SetOpCode(AS_GET_DPMS_STATE);
	link.Attach<screen_id>(ID());
	link.FlushWithReply(&reply);
	reply.Read<uint32>(&state);
	*/
	return state;
}


uint32
BPrivateScreen::DPMSCapabilites()
{
	// TODO: Implement
	uint32 capabilities = 0;
	/*
	BAppServerLink link;
	PortMessage reply;
	link.SetOpCode(AS_GET_DPMS_CAPABILITIES);
	link.Attach<screen_id>(ID());
	link.FlushWithReply(&reply);
	reply.Read<uint32>(&capabilities);
	*/
	return capabilities;
}


void *
BPrivateScreen::BaseAddress()
{
	screen_desc desc;
	if (get_screen_desc(&desc) == B_OK)
		return desc.base_address;
	
	return NULL;
}


uint32
BPrivateScreen::BytesPerRow()
{
	screen_desc desc;
	if (get_screen_desc(&desc) == B_OK)
		return desc.bytes_per_row;
	return 0;
}

	
status_t
BPrivateScreen::get_screen_desc(screen_desc *desc)
{
	status_t status = B_ERROR;
	/*
	BAppServerLink link;
	PortMessage reply;
	link.SetOpCode(AS_GET_SCREEN_DESC);
	link.Attach<screen_id>(ID());
	link.FlushWithReply(&reply);
	reply.Read<screen_desc>(*desc);
	reply.Read<status_t>(&status);
	*/
	return status;
}

	
// Private, called by BApplication::get_scs()
BPrivateScreen::BPrivateScreen()
	:
	fColorMap(NULL),
	fRetraceSem(-1),
	fOwnsColorMap(false)
{
	// TODO: Get a pointer or a copy of the colormap from the app server
	// if we only have one screen (one card, one monitor),
	// it's better to get only a pointer (with BApplication::ro_offset_to_ptr() ?)
	// otherwise every BApplication will keep a copy of the same colormap,
	// and we would waste memory for nothing
}


BPrivateScreen::~BPrivateScreen()
{
	if (fOwnsColorMap)
		free(fColorMap);
}