#include <Vga.h>

Inheritance diagram for HostedVga:

Collaboration diagram for HostedVga:

Public Member Functions
virtual void	setControl (VgaControl which)

virtual void	clearControl (VgaControl which)

virtual bool	setMode (int mode)

virtual bool	setLargestTextMode ()

virtual bool	isMode (size_t nCols, size_t nRows, bool bIsText, size_t nBpp=0)

virtual bool	isLargestTextMode ()

virtual size_t	getNumCols ()

virtual size_t	getNumRows ()

virtual void	rememberMode ()

virtual void	restoreMode ()

virtual void	pokeBuffer (uint8_t *pBuffer, size_t nBufLen)

virtual void	peekBuffer (uint8_t *pBuffer, size_t nBufLen)

virtual void	moveCursor (size_t nX, size_t nY)

bool	initialise ()

	operator uint16_t * () const

Private Member Functions
	HostedVga (const HostedVga &)

HostedVga &	operator= (const HostedVga &)

Static Private Member Functions
static void	printAttrAsAnsi (uint8_t attr)

static uint8_t	ansiColourFixup (uint8_t colour)

Private Attributes
size_t	m_nWidth

size_t	m_nHeight

size_t	m_CursorX

size_t	m_CursorY

int	m_ModeStack

int	m_nMode

uint8_t	m_nControls

uint16_t *	m_pBackbuffer

Additional Inherited Members
Public Types inherited from Vga
enum	VgaControl { LineGraphics = 2, Blink = 3 }

Detailed Description

Vga device abstraction.

Definition at line 28 of file kernel/machine/hosted/Vga.h.

Member Function Documentation

uint8_t HostedVga::ansiColourFixup ( uint8_t colour )

staticprivate

Fix up the given colour into a proper ANSI colour.

Definition at line 146 of file kernel/machine/hosted/Vga.cc.

Referenced by getNumRows().

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void HostedVga::clearControl ( Vga::VgaControl which )

virtual

Clears the given attribute mode control.

Implements Vga.

Definition at line 41 of file kernel/machine/hosted/Vga.cc.

virtual size_t HostedVga::getNumCols ( )

inlinevirtual

Returns: The number of columns in the current mode.

Implements Vga.

Definition at line 68 of file kernel/machine/hosted/Vga.h.

References m_nWidth.

virtual size_t HostedVga::getNumRows ( )

inlinevirtual

Returns: The number of rows in the current mode.

Implements Vga.

Definition at line 76 of file kernel/machine/hosted/Vga.h.

References ansiColourFixup(), m_nHeight, m_pBackbuffer, moveCursor(), peekBuffer(), pokeBuffer(), printAttrAsAnsi(), rememberMode(), and restoreMode().

bool HostedVga::isLargestTextMode ( )

virtual

Tests if the current video mode is the largest text mode.

Returns: True if the current video mode is equal to the largest text mode.

Implements Vga.

Definition at line 64 of file kernel/machine/hosted/Vga.cc.

bool HostedVga::isMode	(	size_t	nCols,
		size_t	nRows,
		bool	bIsText,
		size_t	nBpp = `0`
	)

virtual

Tests the current video mode.

Returns: True if the current mode matches the given arguments.

Implements Vga.

Definition at line 57 of file kernel/machine/hosted/Vga.cc.

void HostedVga::moveCursor	(	size_t	nX,
		size_t	nY
	)

virtual

Moves the cursor to the position specified by the parameters.

Parameters

nX	The column to move to.
nY	The row to move to.

Implements Vga.

Definition at line 122 of file kernel/machine/hosted/Vga.cc.

Referenced by getNumRows().

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void HostedVga::peekBuffer	(	uint8_t *	pBuffer,
		size_t	nBufLen
	)

virtual

Copies the current framebuffer into the given buffer.

The buffer is assumed to be in the correct format for directly copying from video memory. This will obviously depend on the current mode (text/graphical) as well as resolution and bits per pixel (graphics mode only).

Parameters

pBuffer	A pointer to the buffer.
nBufLen	The length of pBuffer.

Implements Vga.

Definition at line 111 of file kernel/machine/hosted/Vga.cc.

Referenced by getNumRows().

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void HostedVga::pokeBuffer	(	uint8_t *	pBuffer,
		size_t	nBufLen
	)

virtual

Copies the given buffer into video memory, replacing the current framebuffer.

The buffer is assumed to be in the correct format for directly copying into video memory. This will obviously depend on the current mode (text/graphical) as well as resolution and bits per pixel (graphics mode only).

Parameters

pBuffer	A pointer to the buffer to swap into video memory.
nBufLen	The length of pBuffer.

Implements Vga.

Definition at line 77 of file kernel/machine/hosted/Vga.cc.

References ArmVersatileVga::moveCursor(), and printAttrAsAnsi().

Referenced by getNumRows().

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void HostedVga::printAttrAsAnsi ( uint8_t attr )

staticprivate

Print the given VGA attribute as an ANSI escape sequence.

Definition at line 180 of file kernel/machine/hosted/Vga.cc.

Referenced by getNumRows(), and pokeBuffer().

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void HostedVga::rememberMode ( )

virtual

Stores the current video mode.

Implements Vga.

Definition at line 69 of file kernel/machine/hosted/Vga.cc.

Referenced by getNumRows().

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void HostedVga::restoreMode ( )

virtual

Restores the saved video mode from a rememberMode() call.

Implements Vga.

Definition at line 73 of file kernel/machine/hosted/Vga.cc.

Referenced by getNumRows().

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void HostedVga::setControl ( Vga::VgaControl which )

virtual

Sets the given attribute mode control.

Implements Vga.

Definition at line 36 of file kernel/machine/hosted/Vga.cc.

bool HostedVga::setLargestTextMode ( )

virtual

Sets the largest possible text mode.

Returns: True on success, false on failure.

Implements Vga.

Definition at line 52 of file kernel/machine/hosted/Vga.cc.

bool HostedVga::setMode ( int mode )

virtual

Changes the mode the VGA device is in.

Parameters

nCols	The number of columns required.
nRows	The number of rows required.
bIsText	True if the caller requires a text mode, false if graphical.
nBpp	Only applicable for graphics modes - the number of bits per pixel.

Returns: True on success, false on failure.

Implements Vga.

Definition at line 46 of file kernel/machine/hosted/Vga.cc.

Member Data Documentation

size_t HostedVga::m_CursorX

private

Cursor X.

Definition at line 155 of file kernel/machine/hosted/Vga.h.

size_t HostedVga::m_CursorY

private

Cursor Y.

Definition at line 160 of file kernel/machine/hosted/Vga.h.

int HostedVga::m_ModeStack

private

We keep a count of the number of times we've entered the debugger without leaving it - when we enter the debugger, we increment this. When we leave, we decrement. If we leave and it reaches zero, we change out of mode 0x3 into the current video mode.

Definition at line 168 of file kernel/machine/hosted/Vga.h.

Referenced by X86Vga::rememberMode(), and X86Vga::restoreMode().

uint8_t HostedVga::m_nControls

private

Most recent VGA controls (as these get reset on mode change).

Definition at line 178 of file kernel/machine/hosted/Vga.h.

Referenced by X86Vga::moveCursor(), X86Vga::rememberMode(), and X86Vga::restoreMode().

size_t HostedVga::m_nHeight

private

The height of the current mode.

Definition at line 150 of file kernel/machine/hosted/Vga.h.

Referenced by getNumRows().