Merge "Update text alignment when using drawTextOnPath." into pi-dev

void SkiaCanvas::drawLayoutOnPath(const minikin::Layout& layout, float hOffset, float vOffset,

                                  const SkPaint& paint, const SkPath& path, size_t start,

                                  size_t end) {

    // Set align to left for drawing, as we don't want individual

    // glyphs centered or right-aligned; the offsets take care of

    // that portion of the alignment.

    SkPaint paintCopy(paint);

    paintCopy.setTextAlign(SkPaint::kLeft_Align);

    SkASSERT(paintCopy.getTextEncoding() == SkPaint::kGlyphID_TextEncoding);

    const int N = end - start;

    SkAutoSTMalloc<1024, uint8_t> storage(N * (sizeof(uint16_t) + sizeof(SkRSXform)));

    SkRSXform* xform = (SkRSXform*)storage.get();

        xform[i - start].fTy = pos.y() + tan.x() * y - halfWidth * tan.y();

    }

    this->asSkCanvas()->drawTextRSXform(glyphs, sizeof(uint16_t) * N, xform, nullptr, paint);

    this->asSkCanvas()->drawTextRSXform(glyphs, sizeof(uint16_t) * N, xform, nullptr, paintCopy);

}

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