InverseBlitter Class Reference

Inheritance diagram for InverseBlitter:

Public Member Functions
void	setBlitter (SkBlitter *blitter, const SkIRect &clip, int shift)
void	prepost (int y, bool isStart)
void	blitH (int x, int y, int width) override
	Blit a horizontal run of one or more pixels.
void	blitAntiH (int, int, const SkAlpha[], const int16_t runs[]) override
void	blitV (int x, int y, int height, SkAlpha alpha) override
	Blit a vertical run of pixels with a constant alpha value.
void	blitRect (int x, int y, int width, int height) override
	Blit a solid rectangle one or more pixels wide.
void	blitMask (const SkMask &, const SkIRect &clip) override
Public Member Functions inherited from SkBlitter
virtual	~SkBlitter ()
virtual void	blitAntiRect (int x, int y, int width, int height, SkAlpha leftAlpha, SkAlpha rightAlpha)
void	blitFatAntiRect (const SkRect &rect)
virtual void	blitAntiH2 (int x, int y, U8CPU a0, U8CPU a1)
virtual void	blitAntiV2 (int x, int y, U8CPU a0, U8CPU a1)
virtual bool	isNullBlitter () const
virtual int	requestRowsPreserved () const
virtual void *	allocBlitMemory (size_t sz)
void	blitRectRegion (const SkIRect &rect, const SkRegion &clip)
void	blitRegion (const SkRegion &clip)

Additional Inherited Members
Static Public Member Functions inherited from SkBlitter
static bool	UseLegacyBlitter (const SkPixmap &, const SkPaint &, const SkMatrix &)
static SkBlitter *	Choose (const SkPixmap &dst, const SkMatrix &ctm, const SkPaint &paint, SkArenaAlloc *, bool drawCoverage, sk_sp< SkShader > clipShader, const SkSurfaceProps &props)
static SkBlitter *	ChooseSprite (const SkPixmap &dst, const SkPaint &, const SkPixmap &src, int left, int top, SkArenaAlloc *, sk_sp< SkShader > clipShader)
Protected Attributes inherited from SkBlitter
SkAutoMalloc	fBlitMemory

Detailed Description

Definition at line 321 of file SkScan_Path.cpp.

Member Function Documentation

blitAntiH()

void InverseBlitter::blitAntiH ( int  x, int  y, const SkAlpha  antialias[], const int16_t  runs[]  )

inlineoverridevirtual

Blit a horizontal run of antialiased pixels; runs[] is a sparse zero-terminated run-length encoding of spans of constant alpha values. The runs[] and antialias[] work together to represent long runs of pixels with the same alphas. The runs[] contains the number of pixels with the same alpha, and antialias[] contain the coverage value for that number of pixels. The runs[] (and antialias[]) are encoded in a clever way. The runs array is zero terminated, and has enough entries for each pixel plus one, in most cases some of the entries will not contain valid data. An entry in the runs array contains the number of pixels (np) that have the same alpha value. The next np value is found np entries away. For example, if runs[0] = 7, then the next valid entry will by at runs[7]. The runs array and antialias[] are coupled by index. So, if the np entry is at runs[45] = 12 then the alpha value can be found at antialias[45] = 0x88. This would mean to use an alpha value of 0x88 for the next 12 pixels starting at pixel 45.

Implements SkBlitter.

Definition at line 349 of file SkScan_Path.cpp.

                                                                             {
        SkDEBUGFAIL("blitAntiH unexpected");
    }

blitH()

void InverseBlitter::blitH ( int  x, int  y, int  width  )

inlineoverridevirtual

Blit a horizontal run of one or more pixels.

Implements SkBlitter.

Definition at line 340 of file SkScan_Path.cpp.

                                                 {
        int invWidth = x - fPrevX;
        if (invWidth > 0) {
            fBlitter->blitH(fPrevX, y, invWidth);
        }
        fPrevX = x + width;
    }

blitMask()

void InverseBlitter::blitMask ( const SkMask &  mask, const SkIRect &  clip  )

inlineoverridevirtual

Blit a pattern of pixels defined by a rectangle-clipped mask; typically used for text.

Reimplemented from SkBlitter.

Definition at line 358 of file SkScan_Path.cpp.

                                                               {
        SkDEBUGFAIL("blitMask unexpected");
    }

blitRect()

void InverseBlitter::blitRect ( int  x, int  y, int  width, int  height  )

inlineoverridevirtual

Blit a solid rectangle one or more pixels wide.

Reimplemented from SkBlitter.

Definition at line 355 of file SkScan_Path.cpp.

                                                                {
        SkDEBUGFAIL("blitRect unexpected");
    }

blitV()

void InverseBlitter::blitV ( int  x, int  y, int  height, SkAlpha  alpha  )

inlineoverridevirtual

Blit a vertical run of pixels with a constant alpha value.

Reimplemented from SkBlitter.

Definition at line 352 of file SkScan_Path.cpp.

                                                                 {
        SkDEBUGFAIL("blitV unexpected");
    }

prepost()

void InverseBlitter::prepost ( int  y, bool  isStart  )

inline

Definition at line 328 of file SkScan_Path.cpp.

                                      {
        if (isStart) {
            fPrevX = fFirstX;
        } else {
            int invWidth = fLastX - fPrevX;
            if (invWidth > 0) {
                fBlitter->blitH(fPrevX, y, invWidth);
            }
        }
    }

setBlitter()

void InverseBlitter::setBlitter ( SkBlitter *  blitter, const SkIRect &  clip, int  shift  )

inline

Definition at line 323 of file SkScan_Path.cpp.

                                                                        {
        fBlitter = blitter;
        fFirstX = clip.fLeft << shift;
        fLastX = clip.fRight << shift;
    }

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

• third_party/skia/src/core/SkScan_Path.cpp