SkShaderBase::Context Class Reference

#include <SkShaderBase.h>

Inheritance diagram for SkShaderBase::Context:

Public Member Functions
	Context (const SkShaderBase &shader, const ContextRec &)
virtual	~Context ()
virtual uint32_t	getFlags () const
virtual void	shadeSpan (int x, int y, SkPMColor[], int count)=0
Public Member Functions inherited from SkNoncopyable
	SkNoncopyable ()=default
	SkNoncopyable (SkNoncopyable &&)=default
SkNoncopyable &	operator= (SkNoncopyable &&)=default

Protected Member Functions
uint8_t	getPaintAlpha () const
const SkMatrix &	getTotalInverse () const

Protected Attributes
const SkShaderBase &	fShader

Detailed Description

Definition at line 297 of file SkShaderBase.h.

Constructor & Destructor Documentation

Context()

SkShaderBase::Context::Context	(	const SkShaderBase &	shader,
		const ContextRec &	rec
	)

Definition at line 108 of file SkShaderBase.cpp.

        : fShader(shader) {
    // We should never use a context with perspective.
    SkASSERT(!rec.fMatrixRec.totalMatrix().hasPerspective());
 
    // Because the context parameters must be valid at this point, we know that the matrix is
    // invertible.
    SkAssertResult(rec.fMatrixRec.totalInverse(&fTotalInverse));
 
    fPaintAlpha = rec.fPaintAlpha;
}

~Context()

SkShaderBase::Context::~Context ( )

virtual

Definition at line 120 of file SkShaderBase.cpp.

{}

Member Function Documentation

getFlags()

virtual uint32_t SkShaderBase::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.

Reimplemented in BitmapProcShaderContext.

Definition at line 310 of file SkShaderBase.h.

{ return 0; }

getPaintAlpha()

uint8_t SkShaderBase::Context::getPaintAlpha ( ) const

inlineprotected

Definition at line 323 of file SkShaderBase.h.

{ return fPaintAlpha; }

getTotalInverse()

const SkMatrix & SkShaderBase::Context::getTotalInverse ( ) const

inlineprotected

Definition at line 324 of file SkShaderBase.h.

{ return fTotalInverse; }

shadeSpan()

virtual void SkShaderBase::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 BitmapProcShaderContext.

Member Data Documentation

fShader

const SkShaderBase& SkShaderBase::Context::fShader

protected

Definition at line 321 of file SkShaderBase.h.

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

• third_party/skia/src/shaders/SkShaderBase.h
• third_party/skia/src/shaders/SkShaderBase.cpp