Inheritance diagram for BitmapProcShaderContext:

Public Member Functions
	BitmapProcShaderContext (const SkShaderBase &shader, const SkShaderBase::ContextRec &rec, SkBitmapProcState *state)

uint32_t	getFlags () const override

void	shadeSpan (int x, int y, SkPMColor dstC[], int count) override

Public Member Functions inherited from SkShaderBase::Context
	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

Additional Inherited Members
Protected Member Functions inherited from SkShaderBase::Context
uint8_t	getPaintAlpha () const

const SkMatrix &	getTotalInverse () const

Protected Attributes inherited from SkShaderBase::Context
const SkShaderBase &	fShader

Detailed Description

Definition at line 22 of file SkBitmapProcShader.cpp.

Constructor & Destructor Documentation

◆ BitmapProcShaderContext()

BitmapProcShaderContext::BitmapProcShaderContext	(	const SkShaderBase &	shader,
		const SkShaderBase::ContextRec &	rec,
		SkBitmapProcState *	state
	)

inline

Definition at line 24 of file SkBitmapProcShader.cpp.

        : INHERITED(shader, rec)
        , fState(state)
        , fFlags(0)
    {
        if (fState->fPixmap.isOpaque() && (255 == this->getPaintAlpha())) {
            fFlags |= SkShaderBase::kOpaqueAlpha_Flag;
        }
    }

Member Function Documentation

◆ getFlags()

uint32_t BitmapProcShaderContext::getFlags ( ) const

inlineoverridevirtual

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 from SkShaderBase::Context.

Definition at line 35 of file SkBitmapProcShader.cpp.

35{ return fFlags; }

◆ shadeSpan()

void BitmapProcShaderContext::shadeSpan	(	int	x,
		int	y,
		SkPMColor	[],
		int	count
	)

inlineoverridevirtual

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.

Implements SkShaderBase::Context.

Definition at line 37 of file SkBitmapProcShader.cpp.

                                                                       {
        const SkBitmapProcState& state = *fState;
        if (state.getShaderProc32()) {
            state.getShaderProc32()(&state, x, y, dstC, count);
            return;
        }
 
        const int BUF_MAX = 128;
        uint32_t buffer[BUF_MAX];
        SkBitmapProcState::MatrixProc   mproc = state.getMatrixProc();
        SkBitmapProcState::SampleProc32 sproc = state.getSampleProc32();
        const int max = state.maxCountForBufferSize(sizeof(buffer[0]) * BUF_MAX);
 
        SkASSERT(state.fPixmap.addr());
 
        for (;;) {
            int n = std::min(count, max);
            SkASSERT(n > 0 && n < BUF_MAX*2);
            mproc(state, buffer, n, x, y);
            sproc(state, buffer, n, dstC);
 
            if ((count -= n) == 0) {
                break;
            }
            SkASSERT(count > 0);
            x += n;
            dstC += n;
        }
    }

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

third_party/skia/src/shaders/SkBitmapProcShader.cpp