MxVideoPresenter::AlphaMask Class Reference

Opaque mask used for efficient hit testing against video transparency. More...

#include <mxvideopresenter.h>

Public Member Functions
	AlphaMask (const MxBitmap &)
	Creates an alpha mask from a bitmap, recording pixel presence in a bitmask. More...
	AlphaMask (const AlphaMask &)
	Copy constructor, clones the bitmask and size. More...
virtual	~AlphaMask ()
	Frees the bitmask memory. More...
MxS32	IsHit (MxU32 p_x, MxU32 p_y)
	Checks whether the specified local coordinate is visible in the mask. More...
MxS32	GetWidth () const
	[AI] Width of the alpha mask in pixels. More...
MxS32	GetHeight () const
	[AI] Height of the alpha mask in pixels. More...

Detailed Description

Opaque mask used for efficient hit testing against video transparency.

[AI] An alpha mask representing frame pixel visibility as a bitmask for hit testing. Constructed from or copied from a video frame. Used to determine clickable regions or pointer hits on non-rectangular/transparent video.

Definition at line 205 of file mxvideopresenter.h.

Constructor & Destructor Documentation

AlphaMask() [1/2]

MxVideoPresenter::AlphaMask::AlphaMask

(

const MxBitmap &

p_bitmap

)

Creates an alpha mask from a bitmap, recording pixel presence in a bitmask.

Parameters

p_bitmap

Source bitmap to generate mask from. [AI]

Definition at line 15 of file mxvideopresenter.cpp.

AlphaMask() [2/2]

MxVideoPresenter::AlphaMask::AlphaMask

(

const AlphaMask &

p_alpha

)

Copy constructor, clones the bitmask and size.

Parameters

p_alpha

Source alpha mask. [AI]

Definition at line 62 of file mxvideopresenter.cpp.

~AlphaMask()

MxVideoPresenter::AlphaMask::~AlphaMask ( )

virtual

Frees the bitmask memory.

[AI]

Definition at line 73 of file mxvideopresenter.cpp.

Member Function Documentation

GetHeight()

MxS32 MxVideoPresenter::AlphaMask::GetHeight ( ) const

inline

[AI] Height of the alpha mask in pixels.

Definition at line 241 of file mxvideopresenter.h.

GetWidth()

MxS32 MxVideoPresenter::AlphaMask::GetWidth ( ) const

inline

[AI] Width of the alpha mask in pixels.

Definition at line 237 of file mxvideopresenter.h.

IsHit()

MxS32 MxVideoPresenter::AlphaMask::IsHit	(	MxU32	p_x,
		MxU32	p_y
	)

Checks whether the specified local coordinate is visible in the mask.

Parameters

p_x	X coordinate (0-based, mask-local). [AI]
p_y	Y coordinate (0-based, mask-local). [AI]

Returns

1 if hit (non-transparent), 0 otherwise. [AI]

[AI]

Definition at line 81 of file mxvideopresenter.cpp.

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The documentation for this class was generated from the following files:

• mxvideopresenter.h
• mxvideopresenter.cpp