KisAlphaMask Class Reference

#include <kis_alpha_mask.h>

Public Member Functions
	KisAlphaMask (const TQImage &img)
	KisAlphaMask (const TQImage &img, bool hasColor)
	KisAlphaMask (TQ_INT32 width, TQ_INT32 height)
TQ_INT32	height () const
TQ_INT32	width () const
TQ_UINT8	alphaAt (TQ_INT32 x, TQ_INT32 y) const
void	setAlphaAt (TQ_INT32 x, TQ_INT32 y, TQ_UINT8 alpha)

Static Public Member Functions
static KisAlphaMaskSP	interpolate (KisAlphaMaskSP mask1, KisAlphaMaskSP mask2, double t)

Detailed Description

KisAlphaMask is intended to create alpha values from a TQImage for use in brush creation.

It is not a generic alpha mask that can be used with KisPaintDevices: use a KisSelection for that.

Definition at line 34 of file kis_alpha_mask.h.

Constructor & Destructor Documentation

KisAlphaMask() [1/3]

KisAlphaMask::KisAlphaMask

(

const TQImage &

img

)

Create an alpha mask based on the specified TQImage.

If the image is not a grayscale, the mask value is calculated from the effective grey level and alpha value.

Definition at line 41 of file kis_alpha_mask.cpp.

KisAlphaMask() [2/3]

KisAlphaMask::KisAlphaMask	(	const TQImage &	img,
		bool	hasColor )

As above except quicker as the image does not need to be scanned to see if it has any colour pixels.

Definition at line 28 of file kis_alpha_mask.cpp.

KisAlphaMask() [3/3]

KisAlphaMask::KisAlphaMask	(	TQ_INT32	width,
		TQ_INT32	height )

Create a transparent mask.

Definition at line 54 of file kis_alpha_mask.cpp.

~KisAlphaMask()

KisAlphaMask::~KisAlphaMask ( )

virtual

Definition at line 62 of file kis_alpha_mask.cpp.

Member Function Documentation

alphaAt()

TQ_UINT8 KisAlphaMask::alphaAt ( TQ_INT32 x, TQ_INT32 y ) const

inline

Returns

the alpha value at the specified position.

Returns TQ_UINT8 OPACITY_TRANSPARENT if the value is outside the bounds of the mask.

XXX: this is, of course, not the best way of masking. Better would be to let KisAlphaMask fill a chunk of memory with the alpha values at the right position, something like void applyMask(TQ_UINT8 *pixeldata, TQ_INT32 pixelWidth, TQ_INT32 alphaPos). That would be fastest, or we could provide an iterator over the mask, that would be nice, too.

Definition at line 80 of file kis_alpha_mask.h.

height()

TQ_INT32 KisAlphaMask::height

(

)

const

Returns

the number of alpha values in a scanline.

Definition at line 71 of file kis_alpha_mask.cpp.

interpolate()

KisAlphaMaskSP KisAlphaMask::interpolate ( KisAlphaMaskSP mask1, KisAlphaMaskSP mask2, double t )

static

Definition at line 112 of file kis_alpha_mask.cpp.

setAlphaAt()

void KisAlphaMask::setAlphaAt	(	TQ_INT32	x,
		TQ_INT32	y,
		TQ_UINT8	alpha )

Definition at line 76 of file kis_alpha_mask.cpp.

width()

TQ_INT32 KisAlphaMask::width

(

)

const

Returns

the number of lines in the mask.

Definition at line 66 of file kis_alpha_mask.cpp.

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

• kis_alpha_mask.h
• kis_alpha_mask.cpp