This class represents a frame that is the (per-pixel) alpha-blend of a (laser-disc) video frame and a V99x8 (or tms9918) video frame. More...

#include <SuperImposedVideoFrame.hh>

Inheritance diagram for openmsx::SuperImposedVideoFrame< Pixel >:

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Collaboration diagram for openmsx::SuperImposedVideoFrame< Pixel >:

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Public Member Functions
	SuperImposedVideoFrame (const FrameSource &src, const FrameSource &super, const PixelOperations< Pixel > &pixelOps)

unsigned	getLineWidth (unsigned line) const override
	Gets the number of display pixels on the given line. More...

const void *	getLineInfo (unsigned line, unsigned &width, void *buf, unsigned bufWidth) const override
	Abstract implementation of getLinePtr(). More...

Public Member Functions inherited from openmsx::FrameSource
void	init (FieldType fieldType_)
	(Re)initialize an existing FrameSource. More...

FieldType	getField () const
	Gets the role this frame plays in interlacing. More...

unsigned	getHeight () const
	Gets the number of lines in this frame. More...

virtual unsigned	getLineWidth (unsigned line) const =0
	Gets the number of display pixels on the given line. More...

unsigned	getWidth () const
	Get the width of (all) lines in this frame. More...

template<std::unsigned_integral Pixel>
Pixel	getLineColor (unsigned line) const
	Get the (single) color of the given line. More...

template<std::unsigned_integral Pixel>
std::span< const Pixel >	getLine (int line, std::span< Pixel > buf) const
	Gets a pointer to the pixels of the given line number. More...

virtual const void *	getLineInfo (unsigned line, unsigned &lineWidth, void *buf, unsigned bufWidth) const =0
	Abstract implementation of getLinePtr(). More...

template<std::unsigned_integral Pixel>
std::span< const Pixel, 320 >	getLinePtr320_240 (unsigned line, std::span< Pixel, 320 > buf) const
	Get a pointer to a given line in this frame, the frame is scaled to 320x240 pixels. More...

template<std::unsigned_integral Pixel>
std::span< const Pixel, 640 >	getLinePtr640_480 (unsigned line, std::span< Pixel, 640 > buf) const
	Get a pointer to a given line in this frame, the frame is scaled to 640x480 pixels. More...

template<std::unsigned_integral Pixel>
std::span< const Pixel, 960 >	getLinePtr960_720 (unsigned line, std::span< Pixel, 960 > buf) const
	Get a pointer to a given line in this frame, the frame is scaled to 960x720 pixels. More...

const PixelFormat &	getPixelFormat () const

Additional Inherited Members
Public Types inherited from openmsx::FrameSource
enum	FieldType { FIELD_NONINTERLACED , FIELD_EVEN , FIELD_ODD }
	What role does this frame play in interlacing? More...

Protected Member Functions inherited from openmsx::FrameSource
	FrameSource (const PixelFormat &format)

	~FrameSource ()=default

void	setHeight (unsigned height_)

virtual bool	hasContiguousStorage () const
	Returns true when two consecutive rows are also consecutive in memory. More...

template<std::unsigned_integral Pixel>
void	scaleLine (std::span< const Pixel > in, std::span< Pixel > out) const

Detailed Description

template<std::unsigned_integral Pixel>
class openmsx::SuperImposedVideoFrame< Pixel >

This class represents a frame that is the (per-pixel) alpha-blend of a (laser-disc) video frame and a V99x8 (or tms9918) video frame.

This is different from a generic 'SuperImposedFrame' class because it always outputs the resolution of the MSX frame. Except for the top/bottom border line, there we return a line with width=320. So usually this means the laserdisc video gets downscaled to 320x240 resolution. The rational for this was that we want the scalers to work on the proper MSX resolution. So the MSX graphics get scaled in the same way whether superimpose is enabled or not.

Definition at line 21 of file SuperImposedVideoFrame.hh.

Constructor & Destructor Documentation

◆ SuperImposedVideoFrame()

template<std::unsigned_integral Pixel>

openmsx::SuperImposedVideoFrame< Pixel >::SuperImposedVideoFrame	(	const FrameSource &	src,
		const FrameSource &	super,
		const PixelOperations< Pixel > &	pixelOps
	)

Definition at line 11 of file SuperImposedVideoFrame.cc.

References openmsx::FrameSource::getHeight(), and openmsx::FrameSource::setHeight().

Member Function Documentation

◆ getLineInfo()

template<std::unsigned_integral Pixel>

const void * openmsx::SuperImposedVideoFrame< Pixel >::getLineInfo	(	unsigned	line,
		unsigned &	lineWidth,
		void *	buf,
		unsigned	bufWidth
	)		const

overridevirtual

Abstract implementation of getLinePtr().

Pixel type is unspecified (implementations that care about the exact type should get it via some other mechanism).

Parameters

line	The line number for the requested line.
lineWidth	Output parameter, the width of the returned line in pixel units.
buf	Buffer space that can optionally be used by the implementation.
bufWidth	The size of the above buffer, in pixel units.

Returns: Pointer to the first pixel of the requested line. This might be the same as the given 'buf' parameter or it might be some internal buffer.

Implements openmsx::FrameSource.

Definition at line 28 of file SuperImposedVideoFrame.cc.

References VLA_SSE_ALIGNED.