This class represents a frame that is the (per-pixel) alpha-blend of two other frames. More...

#include <SuperImposedFrame.hh>

Inheritance diagram for openmsx::SuperImposedFrame:

Collaboration diagram for openmsx::SuperImposedFrame:

Public Member Functions
void	init (const FrameSource top, const FrameSource bottom)

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

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

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

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

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

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

Pixel	getLineColor (unsigned line) const
	Get the (single) color of the given line.

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

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.

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.

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.

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...

using	Pixel = uint32_t

Protected Member Functions inherited from openmsx::FrameSource
	FrameSource ()=default

	~FrameSource ()=default

void	setHeight (unsigned height_)

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

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

Detailed Description

This class represents a frame that is the (per-pixel) alpha-blend of two other frames.

When the two input frames have a different resolution. The result will have the highest resolution of the two inputs (in other words, the lower resolution frame gets upscaled to the higher resolution).

Definition at line 13 of file SuperImposedFrame.hh.

Member Function Documentation

◆ getLineInfo()

const void * openmsx::SuperImposedFrame::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 SuperImposedFrame.cc.

References openmsx::alphaBlendLines(), openmsx::FrameSource::getHeight(), openmsx::FrameSource::getLine(), openmsx::FrameSource::getLineWidth(), and VLA_SSE_ALIGNED.