SkAAClip::RunHead Struct Reference

Public Member Functions
YOffset *	yoffsets ()
const YOffset *	yoffsets () const
uint8_t *	data ()
const uint8_t *	data () const

Static Public Member Functions
static RunHead *	Alloc (int rowCount, size_t dataSize)
static int	ComputeRowSizeForWidth (int width)
static RunHead *	AllocRect (const SkIRect &bounds)
static Iter	Iterate (const SkAAClip &clip)

Public Attributes
std::atomic< int32_t >	fRefCnt
int32_t	fRowCount
size_t	fDataSize

Detailed Description

Definition at line 175 of file SkAAClip.cpp.

Member Function Documentation

Alloc()

static RunHead * SkAAClip::RunHead::Alloc ( int  rowCount, size_t  dataSize  )

inlinestatic

Definition at line 193 of file SkAAClip.cpp.

                                                         {
        size_t size = sizeof(RunHead) + rowCount * sizeof(YOffset) + dataSize;
        RunHead* head = (RunHead*)sk_malloc_throw(size);
        head->fRefCnt.store(1);
        head->fRowCount = rowCount;
        head->fDataSize = dataSize;
        return head;
    }

AllocRect()

static RunHead * SkAAClip::RunHead::AllocRect ( const SkIRect &  bounds )

inlinestatic

Definition at line 213 of file SkAAClip.cpp.

                                                     {
        SkASSERT(!bounds.isEmpty());
        int width = bounds.width();
        size_t rowSize = ComputeRowSizeForWidth(width);
        RunHead* head = RunHead::Alloc(1, rowSize);
        YOffset* yoff = head->yoffsets();
        yoff->fY = bounds.height() - 1;
        yoff->fOffset = 0;
        uint8_t* row = head->data();
        while (width > 0) {
            int n = std::min(width, 255);
            row[0] = n;
            row[1] = 0xFF;
            width -= n;
            row += 2;
        }
        return head;
    }

ComputeRowSizeForWidth()

static int SkAAClip::RunHead::ComputeRowSizeForWidth ( int  width )

inlinestatic

Definition at line 202 of file SkAAClip.cpp.

                                                 {
        // 2 bytes per segment, where each segment can store up to 255 for count
        int segments = 0;
        while (width > 0) {
            segments += 1;
            int n = std::min(width, 255);
            width -= n;
        }
        return segments * 2;    // each segment is row[0] + row[1] (n + alpha)
    }

data() [1/2]

uint8_t * SkAAClip::RunHead::data ( )

inline

Definition at line 186 of file SkAAClip.cpp.

                    {
        return (uint8_t*)(this->yoffsets() + fRowCount);
    }

data() [2/2]

const uint8_t * SkAAClip::RunHead::data ( ) const

inline

Definition at line 189 of file SkAAClip.cpp.

                                {
        return (const uint8_t*)(this->yoffsets() + fRowCount);
    }

Iterate()

static Iter SkAAClip::RunHead::Iterate ( const SkAAClip &  clip )

inlinestatic

Definition at line 232 of file SkAAClip.cpp.

                                              {
        const RunHead* head = clip.fRunHead;
        if (!clip.fRunHead) {
            // A null run head is an empty clip, so return aan already finished iterator.
            return Iter();
        }
 
        return Iter(clip.getBounds().fTop, head->data(), head->yoffsets(),
                    head->yoffsets() + head->fRowCount);
    }

yoffsets() [1/2]

YOffset * SkAAClip::RunHead::yoffsets ( )

inline

Definition at line 180 of file SkAAClip.cpp.

                        {
        return (YOffset*)((char*)this + sizeof(RunHead));
    }

yoffsets() [2/2]

const YOffset * SkAAClip::RunHead::yoffsets ( ) const

inline

Definition at line 183 of file SkAAClip.cpp.

                                    {
        return (const YOffset*)((const char*)this + sizeof(RunHead));
    }

Member Data Documentation

fDataSize

size_t SkAAClip::RunHead::fDataSize

Definition at line 178 of file SkAAClip.cpp.

fRefCnt

std::atomic<int32_t> SkAAClip::RunHead::fRefCnt

Definition at line 176 of file SkAAClip.cpp.

fRowCount

int32_t SkAAClip::RunHead::fRowCount

Definition at line 177 of file SkAAClip.cpp.

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

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