Inheritance diagram for SkShader::Context:

Classes
struct	BlitState

Public Types
typedef void(*	BlitBW )(BlitState *, int x, int y, const SkPixmap &, int count)

typedef void(*	BlitAA )(BlitState *, int x, int y, const SkPixmap &, int count, const SkAlpha[])

typedef void(*	ShadeProc )(const void *ctx, int x, int y, SkPMColor[], int count)
	The const void* ctx is only const because all the implementations are const. More...

Public Member Functions
	Context (const SkShader &shader, const ContextRec &)

virtual uint32_t	getFlags () const
	Called sometimes before drawing with this shader. More...

virtual void	shadeSpan (int x, int y, SkPMColor[], int count)=0
	Called for each span of the object being drawn. More...

virtual void	shadeSpan4f (int x, int y, SkPM4f[], int count)

bool	chooseBlitProcs (const SkImageInfo &info, BlitState *state)

virtual ShadeProc	asAShadeProc (void **ctx)

virtual void	shadeSpanAlpha (int x, int y, uint8_t alpha[], int count)
	Similar to shadeSpan, but only returns the alpha-channel for a span. More...

virtual void	set3DMask (const SkMask *)

Protected Types
enum	MatrixClass { kLinear_MatrixClass, kFixedStepInX_MatrixClass, kPerspective_MatrixClass }

Protected Member Functions
uint8_t	getPaintAlpha () const

const SkMatrix &	getTotalInverse () const

MatrixClass	getInverseClass () const

const SkMatrix &	getCTM () const

virtual bool	onChooseBlitProcs (const SkImageInfo &, BlitState *)

Static Protected Member Functions
static MatrixClass	ComputeMatrixClass (const SkMatrix &)

Protected Attributes
const SkShader &	fShader

Private Types
typedef SkNoncopyable	INHERITED

Private Attributes
SkMatrix	fCTM

SkMatrix	fTotalInverse

uint8_t	fPaintAlpha

uint8_t	fTotalInverseClass

Member Typedef Documentation

typedef void(* SkShader::Context::ShadeProc)(const void *ctx, int x, int y, SkPMColor[], int count)

The const void* ctx is only const because all the implementations are const.

This can be changed to non-const if a new shade proc needs to change the ctx.

Member Function Documentation

virtual uint32_t SkShader::Context::getFlags ( ) const

inlinevirtual

Called sometimes before drawing with this shader.

Return the type of alpha your shader will return. The default implementation returns 0. Your subclass should override if it can (even sometimes) report a non-zero value, since that will enable various blitters to perform faster.

virtual void SkShader::Context::shadeSpan	(	int	x,
		int	y,
		SkPMColor	[],
		int	count
	)

pure virtual

Called for each span of the object being drawn.

Your subclass should set the appropriate colors (with premultiplied alpha) that correspond to the specified device coordinates.

Implemented in SkPerlinNoiseShader::PerlinNoiseShaderContext.

virtual void SkShader::Context::shadeSpanAlpha	(	int	x,
		int	y,
		uint8_t	alpha[],
		int	count
	)

virtual

Similar to shadeSpan, but only returns the alpha-channel for a span.

The default implementation calls shadeSpan() and then extracts the alpha values from the returned colors.

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

include/core/SkShader.h

Classes

Public Types

Public Member Functions

Protected Types

Protected Member Functions

Static Protected Member Functions

Protected Attributes

Private Types

Private Attributes

Member Typedef Documentation

Member Function Documentation