C++ u32string::begin方法代码示例

void FreeTypeFont::doFillGlyphCache(GlyphCache& cache, const std::u32string& characters) {
    /** @bug Crash when atlas is too small */

    /* Get glyph codes from characters */
    std::vector<FT_UInt> charIndices;
    charIndices.resize(characters.size()+1);
    charIndices[0] = 0;
    std::transform(characters.begin(), characters.end(), charIndices.begin()+1,
        [this](const char32_t c) { return FT_Get_Char_Index(ftFont, c); });

    /* Remove duplicates (e.g. uppercase and lowercase mapped to same glyph) */
    std::sort(charIndices.begin(), charIndices.end());
    charIndices.erase(std::unique(charIndices.begin(), charIndices.end()), charIndices.end());

    /* Sizes of all characters */
    std::vector<Vector2i> charSizes;
    charSizes.reserve(charIndices.size());
    for(FT_UInt c: charIndices) {
        CORRADE_INTERNAL_ASSERT_OUTPUT(FT_Load_Glyph(ftFont, c, FT_LOAD_DEFAULT) == 0);
        charSizes.push_back(Vector2i(ftFont->glyph->metrics.width, ftFont->glyph->metrics.height)/64);
    }

    /* Create texture atlas */
    const std::vector<Range2Di> charPositions = cache.reserve(charSizes);

    /* Render all characters to the atlas and create character map */
    Containers::Array<char> pixmap{Containers::ValueInit, std::size_t(cache.textureSize().product())};
    for(std::size_t i = 0; i != charPositions.size(); ++i) {
        /* Load and render glyph */
        /** @todo B&W only if radius != 0 */
        FT_GlyphSlot glyph = ftFont->glyph;
        CORRADE_INTERNAL_ASSERT_OUTPUT(FT_Load_Glyph(ftFont, charIndices[i], FT_LOAD_DEFAULT) == 0);
        CORRADE_INTERNAL_ASSERT_OUTPUT(FT_Render_Glyph(glyph, FT_RENDER_MODE_NORMAL) == 0);

        /* Copy rendered bitmap to texture image */
        const FT_Bitmap& bitmap = glyph->bitmap;
        CORRADE_INTERNAL_ASSERT(std::abs(Int(bitmap.width)-charPositions[i].sizeX()) <= 2);
        CORRADE_INTERNAL_ASSERT(std::abs(Int(bitmap.rows)-charPositions[i].sizeY()) <= 2);
        for(Int yin = 0, yout = charPositions[i].bottom(), ymax = bitmap.rows; yin != ymax; ++yin, ++yout)
            for(Int xin = 0, xout = charPositions[i].left(), xmax = bitmap.width; xin != xmax; ++xin, ++xout)
                pixmap[yout*cache.textureSize().x() + xout] = bitmap.buffer[(bitmap.rows-yin-1)*bitmap.width + xin];

        /* Insert glyph parameters into cache */
        cache.insert(charIndices[i],
            Vector2i(glyph->bitmap_left, glyph->bitmap_top-charPositions[i].sizeY()),
            charPositions[i]);
    }

    /* Set cache image */
    #ifndef MAGNUM_TARGET_GLES2
    Image2D image(PixelFormat::Red, PixelType::UnsignedByte, cache.textureSize(), std::move(pixmap));
    #else
    Image2D image(Context::current() && Context::current()->isExtensionSupported<Extensions::GL::EXT::texture_rg>() ?
        PixelFormat::Red : PixelFormat::Luminance, PixelType::UnsignedByte, cache.textureSize(), std::move(pixmap));
    #endif
    cache.setImage({}, image);
}

inline void
designer< T, C, N >::drawText( T x, T y, const std::u32string &text ) {

	// Set the pen position
	setPenPosition( x, y );

	// Draw the unicode string
	drawText( text.begin(), text.end() );
}

// Convert UTF-32 string to UTF-8 string
std::string luna2d::utf::FromUtf32(const std::u32string& string)
{
	std::string ret;
	utf32to8(string.begin(), string.end(), std::back_inserter(ret));
	return std::move(ret);
}

bool Curses::Key::operator==(const std::u32string &v) const
{
	return keycode == 0 &&
		std::find(v.begin(), v.end(), ukey) != v.end();
}

//==============================================================================
std::string to_utf8(const std::u32string& input) {
  return std::string(
      boost::u32_to_u8_iterator<std::u32string::const_iterator>(input.begin()),
      boost::u32_to_u8_iterator<std::u32string::const_iterator>(input.end()));
}

int wmain(int argc, wchar_t *argv[])
{
	try
	{
		if (argc < 2)
		{
			std::cout << "No url" << std::endl;
			return 1;
		}

		//Получение страницы посредством get-запроса
		const Web::Url l_url(Encoding::utf16to8(reinterpret_cast<char16_t *>(argv[1])));
		const std::string l_content(get(l_url));

		//Извлечение статьи
		std::string l_text;
		if (!recognize(l_content, l_text))
		{
			std::cout << "Couldn't recognize" << std::endl;
			return 1;
		}

		//Формирование путей
		const std::u32string l_utf32path(Encoding::utf8to32(l_url.path()));
		std::string l_fixedPath;
		for (auto j(l_utf32path.begin()); j != l_utf32path.end();)
		{
			const auto i(*j == '/' ? l_fixedPath += '/', j + 1 : j);
			j = std::find(i, l_utf32path.end(), '/');
			const size_t l_size = std::min(30, std::distance(i, j));
			const std::u32string l_part(i, i + l_size);
			l_fixedPath += Encoding::utf32to8(l_part);
		}
		const std::u32string l_u32fn(Encoding::utf8to32(l_url.file()));
		const std::u32string l_base(l_u32fn.substr(0, l_u32fn.find('.')).substr(0, 30));
		const std::string l_fixedName(l_base.empty() ? std::string("a.txt") : Encoding::utf32to8(l_base) + ".txt");
		//http://boost.2283326.n4.nabble.com/boost-filesystem-path-as-utf-8-tp4320098p4322460.html
		boost::filesystem::detail::utf8_codecvt_facet l_utf8;
		const boost::filesystem::path l_dirPath(l_url.host() + l_fixedPath, l_utf8);
		const boost::filesystem::path l_filePath(l_url.host() + l_fixedPath + '/' + l_fixedName, l_utf8);

		//Создание каталогов и сохранения статьи в текстовый файл
		boost::filesystem::create_directories(l_dirPath);
		boost::filesystem::ofstream l_of(l_filePath, std::ios::binary | std::ios::out);
		if (!l_of.is_open())
		{
			std::cout << "Output file open error" << std::endl;
			return -1;
		}
		l_of.write("\xef\xbb\xbf", 3);	//BOM
		l_of.write(l_text.data(), l_text.size());
		l_of.close();

		if (argc > 2)
		{
			const boost::filesystem::path l_xfp(l_url.host() + l_fixedPath + "/1.html", l_utf8);
			boost::filesystem::ofstream l_xof(l_xfp, std::ios::binary | std::ios::out);
			if (l_xof.is_open())
			{
				l_xof.write("\xef\xbb\xbf", 3);
				l_xof.write(l_content.data(), l_content.size());
				l_xof.close();
			}
		}

		return 0;
	}
	catch (const std::bad_alloc &)
	{
		::printf("Mem alloc error");
	}
	catch (const std::exception &a)
	{
		std::cout << "Error" << std::endl << a.what() << std::endl;
	}
	return -1;
}