SkTextBlobToPath.cpp

// Copyright 2019 Google LLC.
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
#include "SkPath.h"
#include "SkTextBlobPriv.h"
#include "SkRSXform.h"
SkPath SkTextBlobToPath(const SkTextBlob* blob) {
    SkPath path;
    for (SkTextBlobRunIterator it(blob); !it.done(); it.next()) {
        uint32_t runSize = it.glyphCount();
        const SkFont& font = it.font();
        SkTextBlobRunIterator::GlyphPositioning glyphPositioning = it.positioning() ;
        std::unique_ptr<SkPoint[]> buffer;
        const SkScalar* pos = it.pos();
        const SkPoint* pts = (const SkPoint*)pos;
        SkPoint offset = it.offset();
        if (SkTextBlobRunIterator::kDefault_Positioning == glyphPositioning) {
            buffer.reset(new SkPoint[it.glyphCount()]);
            font.getPos(it.glyphs(), it.glyphCount(), buffer.get(), offset);
            pts = buffer.get();
        }
        for (uint32_t i = 0; i < runSize; ++i) {
            SkPath glyphPath;
            font.getPath(it.glyphs()[i], &glyphPath);
            switch (glyphPositioning) {
                case SkTextBlobRunIterator::kHorizontal_Positioning:
                    SkASSERT(offset.x() == 0);
                    path.addPath(glyphPath, pos[i], offset.y());
                    break;
                case SkTextBlobRunIterator::kDefault_Positioning:
                case SkTextBlobRunIterator::kFull_Positioning:
                    SkASSERT((offset == SkPoint{0, 0}));
                    path.addPath(glyphPath, pts[i].x(), pts[i].y());
                    break;
                case SkTextBlobRunIterator::kRSXform_Positioning:
                    SkASSERT((offset == SkPoint{0, 0}));
                    {
                        SkMatrix tmp;
                        tmp.setRSXform(((const SkRSXform*)pos)[i]);
                        path.addPath(glyphPath, tmp);
                    }
                    break;
            }
        }
    }
    return path;
}