Пример #1
0
SkShaper::SkShaper(sk_sp<SkTypeface> tf) : fImpl(new Impl) {
    fImpl->fTypeface = tf ? std::move(tf) : SkTypeface::MakeDefault();
    int index;
    std::unique_ptr<SkStreamAsset> asset(fImpl->fTypeface->openStream(&index));
    size_t size = asset->getLength();
    SkAutoMalloc autoMalloc(size);  // TODO(halcanary): Avoid this malloc+copy.
    asset->read(autoMalloc.get(), size);
    asset = nullptr;
    void* ptr = autoMalloc.get();
    hb_blob_t* blob = hb_blob_create((char*)autoMalloc.release(), size,
                                     HB_MEMORY_MODE_READONLY, ptr, sk_free);
    SkASSERT(blob);
    hb_blob_make_immutable(blob);

    struct HBFaceDel {
        void operator()(hb_face_t* f) { hb_face_destroy(f); }
    };
    std::unique_ptr<hb_face_t, HBFaceDel> face(hb_face_create(blob, (unsigned)index));
    hb_blob_destroy(blob);
    SkASSERT(face);
    if (!face) {
        return;
    }
    hb_face_set_index(face.get(), (unsigned)index);
    hb_face_set_upem(face.get(), fImpl->fTypeface->getUnitsPerEm());

    fImpl->fHarfBuzzFont.reset(hb_font_create(face.get()));
    SkASSERT(fImpl->fHarfBuzzFont);
    hb_font_set_scale(fImpl->fHarfBuzzFont.get(), FONT_SIZE_SCALE, FONT_SIZE_SCALE);
    hb_ot_font_set_funcs(fImpl->fHarfBuzzFont.get());

    fImpl->fBuffer.reset(hb_buffer_create());
}
Пример #2
0
void* ScFace::ScFaceData::hbFont()
{
	if (!m_hbFont)
	{
		if (!ftFace())
			return NULL;

		if (formatCode == ScFace::SFNT || formatCode == ScFace::TTCF || formatCode == ScFace::TYPE42)
		{
			// use HarfBuzz internal font functions for formats it supports,
			// gives us more consistent glyph metrics.
			FT_Reference_Face(ftFace());
			hb_face_t *hbFace = hb_face_create_for_tables(referenceTable, ftFace(), (hb_destroy_func_t) FT_Done_Face);
			hb_face_set_index(hbFace, ftFace()->face_index);
			hb_face_set_upem(hbFace, ftFace()->units_per_EM);

			m_hbFont = hb_font_create(hbFace);
			hb_ot_font_set_funcs(reinterpret_cast<hb_font_t*>(m_hbFont));

			hb_face_destroy(hbFace);
		}
		else
		{
			m_hbFont = hb_ft_font_create_referenced(ftFace());
		}
	}

	return m_hbFont;
}
Пример #3
0
int shape (lua_State *L) {    
    size_t font_l;
    const char * text = luaL_checkstring(L, 1);
    const char * font_s = luaL_checklstring(L, 2, &font_l);
    unsigned int font_index = luaL_checknumber(L, 3);
    const char * script = luaL_checkstring(L, 4);
    const char * direction_s = luaL_checkstring(L, 5);
    const char * lang = luaL_checkstring(L, 6);
    double point_size = luaL_checknumber(L, 7);
    const char * featurestring = luaL_checkstring(L, 8);

    hb_segment_properties_t segment_props;
    hb_shape_plan_t *shape_plan;

    hb_direction_t direction;
    hb_feature_t* features;
    int nFeatures = 0;
    unsigned int glyph_count = 0;
    hb_font_t *hbFont;
    hb_buffer_t *buf;
    hb_glyph_info_t *glyph_info;
    hb_glyph_position_t *glyph_pos;
    unsigned int j;

    features = scan_feature_string(featurestring, &nFeatures);

    if (!strcasecmp(direction_s,"RTL"))
      direction = HB_DIRECTION_RTL;
    else if (!strcasecmp(direction_s,"TTB"))
      direction = HB_DIRECTION_TTB;
    else
      direction = HB_DIRECTION_LTR;

    hb_blob_t* blob = hb_blob_create (font_s, font_l, HB_MEMORY_MODE_WRITABLE, (void*)font_s, NULL);
    hb_face_t* hbFace = hb_face_create (blob, font_index);
    hbFont = hb_font_create (hbFace);
    unsigned int upem = hb_face_get_upem(hbFace);
    hb_font_set_scale(hbFont, upem, upem);

    /* Harfbuzz's support for OT fonts is great, but
       there's currently no support for CFF fonts, so
       downgrade to Freetype for those. */
    if (strncmp(font_s, "OTTO", 4) == 0) {
      hb_ft_font_set_funcs(hbFont);
    } else {
      hb_ot_font_set_funcs(hbFont);
    }

    buf = hb_buffer_create();
    hb_buffer_add_utf8(buf, text, strlen(text), 0, strlen(text));

    hb_buffer_set_script(buf, hb_tag_from_string(script, strlen(script)));
    hb_buffer_set_direction(buf, direction);
    hb_buffer_set_language(buf, hb_language_from_string(lang,strlen(lang)));

    hb_buffer_guess_segment_properties(buf);
    hb_buffer_get_segment_properties(buf, &segment_props);
    shape_plan = hb_shape_plan_create_cached(hbFace, &segment_props, features, nFeatures, NULL);
    int res = hb_shape_plan_execute(shape_plan, hbFont, buf, features, nFeatures);

    if (direction == HB_DIRECTION_RTL) {
      hb_buffer_reverse(buf); /* URGH */
    }
    glyph_info   = hb_buffer_get_glyph_infos(buf, &glyph_count);
    glyph_pos    = hb_buffer_get_glyph_positions(buf, &glyph_count);
    lua_checkstack(L, glyph_count);
    for (j = 0; j < glyph_count; ++j) {
      char namebuf[255];
      hb_glyph_extents_t extents = {0,0,0,0};
      hb_font_get_glyph_extents(hbFont, glyph_info[j].codepoint, &extents);

      lua_newtable(L);
      lua_pushstring(L, "name");
      hb_font_get_glyph_name( hbFont, glyph_info[j].codepoint, namebuf, 255 );
      lua_pushstring(L, namebuf);
      lua_settable(L, -3);

      /* We don't apply x-offset and y-offsets for TTB, which
      is arguably a bug. We should. The reason we don't is that
      Harfbuzz assumes that you want to shift the character from a
      top-center baseline to a bottom-left baseline, and gives you
      offsets which do that. We don't want to do that so we ignore the
      offsets. I'm told there is a way of configuring HB's idea of the
      baseline, and we should use that and take out this condition. */
      if (direction != HB_DIRECTION_TTB) {
        if (glyph_pos[j].x_offset) {
          lua_pushstring(L, "x_offset");
          lua_pushnumber(L, glyph_pos[j].x_offset * point_size / upem);
          lua_settable(L, -3);
        }

        if (glyph_pos[j].y_offset) {
          lua_pushstring(L, "y_offset");
          lua_pushnumber(L, glyph_pos[j].y_offset * point_size / upem);
          lua_settable(L, -3);
        }
      }

      lua_pushstring(L, "codepoint");
      lua_pushinteger(L, glyph_info[j].codepoint);
      lua_settable(L, -3);
      lua_pushstring(L, "index");
      lua_pushinteger(L, glyph_info[j].cluster);
      lua_settable(L, -3);

      double height = extents.y_bearing * point_size / upem;
      double tHeight = extents.height * point_size / upem;
      double width = glyph_pos[j].x_advance * point_size / upem;

      /* The PDF model expects us to make positioning adjustments
      after a glyph is painted. For this we need to know the natural
      glyph advance. libtexpdf will use this to compute the adjustment. */
      double glyphAdvance = hb_font_get_glyph_h_advance(hbFont, glyph_info[j].codepoint) * point_size / upem;

      if (direction == HB_DIRECTION_TTB) {
        height = -glyph_pos[j].y_advance * point_size / upem;
        tHeight = -height; /* Set depth to 0 - depth has no meaning for TTB */
        width = glyphAdvance;
        glyphAdvance = height;
      }
      lua_pushstring(L, "glyphAdvance");
      lua_pushnumber(L, glyphAdvance);
      lua_settable(L, -3);

      lua_pushstring(L, "width");
      lua_pushnumber(L, width);
      lua_settable(L, -3);

      lua_pushstring(L, "height");
      lua_pushnumber(L, height);
      lua_settable(L, -3);
      lua_pushstring(L, "depth");
      lua_pushnumber(L, -tHeight - height);
      lua_settable(L, -3);
    }
    /* Cleanup */
    hb_buffer_destroy(buf);
    hb_font_destroy(hbFont);
    hb_shape_plan_destroy(shape_plan);

    free(features);
    return glyph_count;
}