static hb_position_t harfBuzzGetGlyphVerticalAdvance(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, void* userData)
{
HarfBuzzFontData* hbFontData = reinterpret_cast<HarfBuzzFontData*>(fontData);
const OpenTypeVerticalData* verticalData = hbFontData->m_simpleFontData->verticalData();
if (!verticalData)
return SkiaScalarToHarfBuzzPosition(hbFontData->m_simpleFontData->fontMetrics().height());
Glyph theGlyph = glyph;
float advanceHeight = -verticalData->advanceHeight(hbFontData->m_simpleFontData.get(), theGlyph);
return SkiaScalarToHarfBuzzPosition(SkFloatToScalar(advanceHeight));
}
static hb_bool_t harfBuzzGetGlyphVerticalOrigin(hb_font_t* hbFont, void* fontData, hb_codepoint_t glyph, hb_position_t* x, hb_position_t* y, void* userData)
{
HarfBuzzFontData* hbFontData = reinterpret_cast<HarfBuzzFontData*>(fontData);
const OpenTypeVerticalData* verticalData = hbFontData->m_simpleFontData->verticalData();
if (!verticalData)
return false;
float result[] = { 0, 0 };
Glyph theGlyph = glyph;
verticalData->getVerticalTranslationsForGlyphs(hbFontData->m_simpleFontData.get(), &theGlyph, 1, result);
*x = SkiaScalarToHarfBuzzPosition(-result[0]);
*y = SkiaScalarToHarfBuzzPosition(-result[1]);
return true;
}
static void SkiaGetGlyphWidthAndExtents(SkPaint* paint, hb_codepoint_t codepoint, hb_position_t* width, hb_glyph_extents_t* extents)
{
ASSERT(codepoint <= 0xFFFF);
paint->setTextEncoding(SkPaint::kGlyphID_TextEncoding);
SkScalar skWidth;
SkRect skBounds;
uint16_t glyph = codepoint;
paint->getTextWidths(&glyph, sizeof(glyph), &skWidth, &skBounds);
if (width)
*width = SkiaScalarToHarfBuzzPosition(skWidth);
if (extents) {
// Invert y-axis because Skia is y-grows-down but we set up HarfBuzz to be y-grows-up.
extents->x_bearing = SkiaScalarToHarfBuzzPosition(skBounds.fLeft);
extents->y_bearing = SkiaScalarToHarfBuzzPosition(-skBounds.fTop);
extents->width = SkiaScalarToHarfBuzzPosition(skBounds.width());
extents->height = SkiaScalarToHarfBuzzPosition(-skBounds.height());
}
}
hb_font_t* HarfBuzzFace::createFont()
{
HarfBuzzFontData* hbFontData = new HarfBuzzFontData(m_glyphCacheForFaceCacheEntry);
m_platformData->setupPaint(&hbFontData->m_paint);
hb_font_t* font = hb_font_create(m_face);
hb_font_set_funcs(font, harfBuzzSkiaGetFontFuncs(), hbFontData, destroyHarfBuzzFontData);
float size = m_platformData->size();
int scale = SkiaScalarToHarfBuzzPosition(size);
hb_font_set_scale(font, scale, scale);
hb_font_make_immutable(font);
return font;
}
static hb_position_t harfBuzzGetGlyphHorizontalKerning(hb_font_t*, void* fontData, hb_codepoint_t leftGlyph, hb_codepoint_t rightGlyph, void*)
{
HarfBuzzFontData* hbFontData = reinterpret_cast<HarfBuzzFontData*>(fontData);
if (hbFontData->m_paint.isVerticalText()) {
// We don't support cross-stream kerning
return 0;
}
SkTypeface* typeface = hbFontData->m_paint.getTypeface();
const uint16_t glyphs[2] = { static_cast<uint16_t>(leftGlyph), static_cast<uint16_t>(rightGlyph) };
int32_t kerningAdjustments[1] = { 0 };
if (typeface->getKerningPairAdjustments(glyphs, 2, kerningAdjustments)) {
SkScalar upm = SkIntToScalar(typeface->getUnitsPerEm());
SkScalar size = hbFontData->m_paint.getTextSize();
return SkiaScalarToHarfBuzzPosition(SkScalarMulDiv(SkIntToScalar(kerningAdjustments[0]), size, upm));
}
return 0;
}