SkClusterator Class Reference

#include <SkClusterator.h>

Classes
struct	Cluster

Public Member Functions
	SkClusterator (const sktext::GlyphRun &run)
uint32_t	glyphCount () const
bool	reversedChars () const
Cluster	next ()

Detailed Description

Given the m-to-n glyph-to-character mapping data (as returned by harfbuzz), iterate over the clusters.

Definition at line 19 of file SkClusterator.h.

Constructor & Destructor Documentation

SkClusterator()

SkClusterator::SkClusterator

(

const sktext::GlyphRun &

run

)

Definition at line 28 of file SkClusterator.cpp.

    : fClusters(run.clusters().data())
    , fUtf8Text(run.text().data())
    , fGlyphCount(SkToU32(run.glyphsIDs().size()))
    , fTextByteLength(SkToU32(run.text().size()))
    , fReversedChars(fClusters ? is_reversed(fClusters, fGlyphCount) : false)
{
    if (fClusters) {
        SkASSERT(fUtf8Text && fTextByteLength > 0 && fGlyphCount > 0);
    } else {
        SkASSERT(!fUtf8Text && fTextByteLength == 0);
    }
}

Member Function Documentation

glyphCount()

uint32_t SkClusterator::glyphCount ( ) const

inline

Definition at line 22 of file SkClusterator.h.

{ return fGlyphCount; }

next()

SkClusterator::Cluster SkClusterator::next

(

)

Definition at line 42 of file SkClusterator.cpp.

                                         {
    if (fCurrentGlyphIndex >= fGlyphCount) {
        return Cluster{nullptr, 0, 0, 0};
    }
    if (!fClusters || !fUtf8Text) {
        return Cluster{nullptr, 0, fCurrentGlyphIndex++, 1};
    }
    uint32_t clusterGlyphIndex = fCurrentGlyphIndex;
    uint32_t cluster = fClusters[clusterGlyphIndex];
    do {
        ++fCurrentGlyphIndex;
    } while (fCurrentGlyphIndex < fGlyphCount && cluster == fClusters[fCurrentGlyphIndex]);
    uint32_t clusterGlyphCount = fCurrentGlyphIndex - clusterGlyphIndex;
    uint32_t clusterEnd = fTextByteLength;
    for (unsigned i = 0; i < fGlyphCount; ++i) {
       uint32_t c = fClusters[i];
       if (c > cluster && c < clusterEnd) {
           clusterEnd = c;
       }
    }
    uint32_t clusterLen = clusterEnd - cluster;
    return Cluster{fUtf8Text + cluster, clusterLen, clusterGlyphIndex, clusterGlyphCount};
}

reversedChars()

bool SkClusterator::reversedChars ( ) const

inline

Definition at line 23 of file SkClusterator.h.

{ return fReversedChars; }

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

• third_party/skia/src/pdf/SkClusterator.h
• third_party/skia/src/pdf/SkClusterator.cpp