libTextSuite/header/libTextSuite.hpp

#ifndef LIB_TEXT_SUITE_HPP
#define LIB_TEXT_SUITE_HPP

#include <list>
#include <memory>
#include <string>
#include <stdint.h>
#include <initializer_list>

#if defined(WIN32) || defined(WIN64) || defined(_WIN32) || defined(_WIN64)
#   define LTS_WINDOWS
#   include <windows.h>
#elif LINUX || __linux__
#   define LTS_LINUX
#   include <dlfcn.h>
#else
#   error "unknown operation system"
#endif

#if __MINGW32__
#  define WINAPI __stdcall
#else
#  define WINAPI
#endif

/**********************************************************************************************************************************/
/* public interface                                                                                                               */
/**********************************************************************************************************************************/
namespace lts
{
    /* simple types *******************************************************************************************************************/
    typedef wchar_t     WideChar;
    typedef void*       RenderRef;
    typedef void*       Handle;
    typedef Handle      ContextHandle;
    typedef Handle      RendererHandle;
    typedef Handle      TextBlockHandle;
    typedef Handle      FontCreatorHandle;
    typedef Handle      FontHandle;
    typedef Handle      PostProcessorHandle;
    typedef Handle      ImageHandle;
    typedef Handle      CharHandle;

    /* enumerations *******************************************************************************************************************/
    enum class ErrorCode : int32_t
    {
        Unknown                     =   -1,
        None                        =    0,
        
        // misc
        NotInitialized              =    1,
        InvalidEnum                 =    2,
        InvalidValue                =    3,
        InvalidOperation            =    4,
        InvalidType                 =    5,
        
        // invalid handles
        InvalidContextHandle        =  100,
        InvalidRendererHandle       =  101,
        InvalidTextBlockHandle      =  102,
        InvalidFontHandle           =  103,
        InvalidFontCreatorHandle    =  104,
        InvalidImageHandle          =  105,
        InvalidPostProcHandle       =  106,
        
        // library
        InvalidLibName              =  200,
        InvalidLibHandle            =  201,
        InvalidMethodName           =  202
    };
    static_assert(sizeof(ErrorCode) == 4, "size of lts::ErrorCode should be 4");
    
    enum class CodePage : uint32_t
    {
        cpUTF8,
        cpISO_8859_1,
        cpISO_8859_2,
        cpISO_8859_3,
        cpISO_8859_4,
        cpISO_8859_5,
        cpISO_8859_6,
        cpISO_8859_7,
        cpISO_8859_8,
        cpISO_8859_9,
        cpISO_8859_10,
        cpISO_8859_11,
        cpISO_8859_13,
        cpISO_8859_14,
        cpISO_8859_15,
        cpISO_8859_16,
        cpISO_037,
        cpISO_437,
        cpISO_500,
        cpISO_737,
        cpISO_775,
        cpISO_850,
        cpISO_852,
        cpISO_855,
        cpISO_857,
        cpISO_860,
        cpISO_861,
        cpISO_862,
        cpISO_863,
        cpISO_864,
        cpISO_865,
        cpISO_866,
        cpISO_869,
        cpISO_874,
        cpISO_875,
        cpISO_1026,
        cpISO_1250,
        cpISO_1251,
        cpISO_1252,
        cpISO_1253,
        cpISO_1254,
        cpISO_1255,
        cpISO_1256,
        cpISO_1257,
        cpISO_1258
    };
    static_assert(sizeof(CodePage) == 4, "size of lts::CodePage should be 4");
    
    enum class Format : uint32_t
    {
        Empty,
        RGBA8,
        LumAlpha8,
        Alpha8,
        Lum8
    };
    static_assert(sizeof(Format) == 4, "size of lts::Format should be 4");
    
    enum class RendererType : uint32_t
    {
        Unknown,
        OpenGL,
        OpenGLES
    };
    static_assert(sizeof(RendererType) == 4, "size of lts::RendererType should be 4");
    
    enum class  FontCreatorType : uint32_t
    {
        Unknown,
        FreeType,
        GDI,
        Custom
    };
    static_assert(sizeof(FontCreatorType) == 4, "size of lts::FontCreatorType should be 4");
    
    enum class VertAlign : uint32_t
    {
        Top,
        Center,
        Bottom
    };
    static_assert(sizeof(VertAlign) == 4, "size of lts::VertAlign should be 4");
    
    enum class HorzAlign : uint32_t
    {
        Left,
        Center,
        Right,
        Justify
    };
    static_assert(sizeof(HorzAlign) == 4, "size of lts::HorzAlign should be 4");
    
    enum class Clipping : uint32_t
    {
        None,
        WordBorder,
        CharBorder,
        WordComplete,
        CharComplete
    };
    static_assert(sizeof(Clipping) == 4, "size of lts::Clipping should be 4");
    
    enum class AntiAliasing : uint32_t
    {
        None,
        Normal
    };
    static_assert(sizeof(AntiAliasing) == 4, "size of lts::AntiAliasing should be 4");
    
    enum class CharRangeUsage : uint32_t
    {
        Include,
        Exclude
    };
    static_assert(sizeof(CharRangeUsage) == 4, "size of lts::CharRangeUsage should be 4");
        
    enum class ImageMode : uint32_t
    {
        Ignore,
        Replace,
        Modulate
    };
    static_assert(sizeof(ImageMode) == 4, "size of lts::ImageMode should be 4");

    /* flags **************************************************************************************************************************/
    template <typename TEnum, typename TBase>
    class Flags
    {
    private:
        TBase _value;
    public:
        inline bool isSet(const TEnum& e) const
            { return (_value & (1 << e)); };
        inline void set(const TEnum& e)
            { _value |= (1 << e); };
        inline void unset(const TEnum& e)
            { _value &= ~(1 << e); };
        inline void clear()
            { _value = 0; };
        Flags() :
            _value(0)
            { };
        Flags(const TEnum& e) :
            _value(1 << e)
            { };
        Flags(const std::initializer_list<TEnum>& vec) :
            _value(0)
        {
            for (const auto& e : vec)
                set(e);
        };
        template <typename T>
        Flags(T begIt, T endIt) :
            _value(0)
        {
            for (auto i = begIt; i != endIt; ++i)
                set(*i);
        };
    };
    
    enum class BlockFlag
    {
        WordWrap
    };
    typedef Flags<BlockFlag, uint32_t> BlockFlags;
    
    enum class FontStyle
    {
        Bold,
        Italic,
        Underline,
        Strikeout,
    };
    typedef Flags<FontStyle, uint32_t> FontStyles;
    
    enum class ColorChannel
    {
        Red,
        Green,
        Blue,
        Alpha
    };
    typedef Flags<ColorChannel, uint32_t> ColorChannels;
    
    /* structures *********************************************************************************************************************/
    struct Position
    {
        int x;
        int y;
    };
    
    union Rect
    {
        struct { Position top_left, bottom_right; };
        struct { int32_t left, top, right, bottom; };
    };
    
    union Color4f
    {
        struct { float r, g, b, a; };
        float arr[4];
    };
    
    struct GlyphMetric
    {
        Position                glyphOrigin;
        Rect                    glyphRect;
        int32_t                 advance;
    };
    
    struct TextMetric
    {
        int32_t                 ascent;
        int32_t                 descent;
        int32_t                 externalLeading;
        int32_t                 baseLineOffset;
        int32_t                 charSpacing;
        int32_t                 lineHeight;
        int32_t                 lineSpacing;
    };
    
    struct FontMetric
    {
        int32_t                 size;
        FontStyles              styles;
        AntiAliasing            antiAliasing;
        WideChar                defaultChar;
        uint8_t                 __reserved[2];
        
        int32_t                 ascent;
        int32_t                 descent;
        int32_t                 externalLeading;
        int32_t                 baseLineOffset;
        
        int32_t                 underlinePos;
        int32_t                 underlineSize;
        int32_t                 strikeoutPos;
        int32_t                 strikeoutSize;
    };
    
    typedef float       Vector4f[4];
    typedef Vector4f    Matrix4f[4];
    typedef ImageMode   ImageModes[4];
    
    /* exeption ***********************************************************************************************************************/
    class Exception : public std::exception
    {
    private:
        std::string _message;
        ErrorCode   _errorCode;
        
    public:
        ErrorCode getErrorCode() const;
        std::string getMessage() const;
        virtual const char* what() const throw();
        Exception(std::string message, ErrorCode errorCode = ErrorCode::Unknown);
        ~Exception() throw();
    };
    
    /* library ************************************************************************************************************************/
    class Library
    {
    public:
        struct Impl;
        #if defined(LTS_WINDOWS)
            typedef HMODULE Handle; //!< shader file handle
        #elif defined(LTS_LINUX)
            typedef void* Handle;   //!< shader file handle
        #else
            #error "unknown operation system"
        #endif
        
    private:
        Impl*   _impl;
        Handle  _handle;
        Library(const Library& that) = delete;
    public:
        const Impl& getImpl()          const;
        ErrorCode   getLastErrorCode() const;
        std::string getLastErrorMsg()  const;
    
        Library(const std::string& libName);
        ~Library();
    };
    
    /* context ************************************************************************************************************************/
    class Context
    {
        friend class Image;
    private:
        const Library::Impl&    _impl;
        ContextHandle           _handle;
        Context(const Context&) = delete;
    public:
        ContextHandle   getHandle() const;
        CodePage        getCodePage() const;
        WideChar        getDefaultChar() const;
        void            setCodePage(const CodePage value);
        void            setDefaultChar(const WideChar value);
        
        Context(const Library& library);
    };
    
    /* char ***************************************************************************************************************************/
    class Char
    {
    private:
        const Library::Impl&    _impl;
        CharHandle              _handle;
        Char(const Char&) = delete;
    public:
        CharHandle  getHandle() const;
        WideChar    getCharCode() const;
        GlyphMetric getGlyphMetric() const;
        void        setGlyphMetric(const GlyphMetric& value);
        
        Char(const Library::Impl& impl, CharHandle handle);
    };
    
    /* image **************************************************************************************************************************/
    class Image
    {
    public:
        typedef void    (*LoadCallback) (Image& image, int x, int y, Color4f& pixel, void* args);
        typedef Color4f (*BlendCallback)(Image& image, Color4f src, Color4f dst, void* args);
        
        typedef std::function<void(Image& image, int x, int y, Color4f& pixel)> LoadFunction;
        typedef std::function<Color4f(Image& image, Color4f src, Color4f dst)>  BlendFunction;
        
    private:
        const Library::Impl&    _impl;
        ImageHandle             _handle;
        bool                    _ownsHandle;
        Image(const Image&) = delete;
    public:
        ImageHandle getHandle() const;
        bool        getIsEmpty() const;
        int         getWidth() const;
        int         getHeight() const;
        int         getLineSize() const;
        int         getDataSize() const;
        Format      getFormat() const;
        void*       getData() const;
        void*       getScanline(int index) const;
        bool        getPixelAt(int x, int y, Color4f& color) const;
        
        void        assign(const Image& image);
        void        createEmpty(Format format, int width, int height);
        void        loadFromFunc(LoadCallback callback, void* args);
        void        loadFromFunc(LoadFunction func);
        
        void        resize(int width, int height, int x, int y);
        void        fillColor(Color4f color, ColorChannels mask, ImageModes modes);
        void        fillPattern(const Image& pattern, int x, int y, ColorChannels mask, ImageModes modes);
        void        blend(const Image& image, int x, int y, BlendCallback callback, void* args);
        void        blend(const Image& image, int x, int y, BlendFunction func);
        void        blur(float horzRad, float horzStr, float vertRad, float vertStr, ColorChannels mask);
        
        Image(const Library::Impl& impl, ImageHandle handle);
        Image(const Context& context);
        virtual ~Image();
    private:
        static void WINAPI loadCallback(ImageHandle handle, int x, int y, lts::Color4f& pixel, void* args);
        static void WINAPI loadFunc(ImageHandle handle, int x, int y, lts::Color4f& pixel, void* args);
        struct LoadArgs
        {
            void*           args;
            Image*          image;
            LoadCallback    callback;
            LoadFunction*   func;
        };
    
        static void WINAPI blendCallback(ImageHandle handle, lts::Color4f src, lts::Color4f dst, lts::Color4f& result, void* args);
        static void WINAPI blendFunc(ImageHandle handle, lts::Color4f src, lts::Color4f dst, lts::Color4f& result, void* args);
        struct BlendArgs
        {
            void*           args;
            Image*          image;
            BlendCallback   callback;
            BlendFunction*  func;
        };
    };
    
    /* post processor *****************************************************************************************************************/
    class PostProcessor
    {
    private:
        const Library::Impl&    _impl;
        PostProcessorHandle     _handle;
        PostProcessor(const PostProcessor&) = delete;
    protected:
        virtual void execute(Char c, Image i);
        PostProcessor(PostProcessorHandle handle);
    public:
        PostProcessorHandle getHandle() const;
        
        void addRange(CharRangeUsage usage, WideChar start, WideChar stop);
        void addChars(CharRangeUsage usage, WideChar* chars);
        void clearRanges();
        
        virtual ~PostProcessor();
    };
    
    /* post processor fill color ******************************************************************************************************/
    class PostProcessorFillColor final : public PostProcessor
    {
    private:
        const Library::Impl&    _impl;
        Color4f                 _color;
        ImageModes              _modes;
        ColorChannels           _channels;
    public:
        const Color4f&          getColor() const;
        const ImageModes&       getModes() const;
        const ColorChannels&    getChannels() const;
        
        PostProcessorFillColor(const Context& context, const Color4f& color, const ImageModes& modes, const ColorChannels& channels);
    };
    
    /* post processor fill pattern ****************************************************************************************************/
    class PostProcessorFillPattern final : public PostProcessor
    {
    private:
        const Image&    _pattern;
        bool            _ownsPattern;
        Position        _position;
        ImageModes      _modes;
        ColorChannels   _channels;
    protected:
        const Library::Impl& _impl;
    public:
        const Image&            getPattern() const;
        bool                    getOwnsPattern() const;
        const Position&         getPosition() const;
        const ImageModes&       getModes() const;
        const ColorChannels&    getChannels() const;
        
        PostProcessorFillPattern(const Context& context, const Image& pattern, bool ownsPattern,
            const Position& pos, ImageModes modes, ColorChannels channels);
        virtual ~PostProcessorFillPattern();
    };
    
    /* post processor border **********************************************************************************************************/
    class PostProcessorBorder final : public PostProcessor
    {
    private:
        float   _width;
        float   _strength;
        Color4f _color;
        bool    _keepSize;
    public:
        float   getWidth() const;
        float   getStrength() const;
        Color4f getColor() const;
        bool    getKeepSize() const;
        
        PostProcessorBorder(const Context& context, float width, float strength, Color4f color, bool keepSize);
    };
    
    /* post processor shadow **********************************************************************************************************/
    class PostProcessorShadow final : public PostProcessor
    {
    private:
        float       _radius;
        float       _strength;
        Position    _position;
        Color4f     _color;
    public:
        float       getRadius() const;
        float       getStrength() const;
        Position    getPosition() const;
        Color4f     getColor() const;
        
        PostProcessorShadow(const Context& context, float radius, float strength, const Position& offset, const Color4f& color);
    };
    
    /* post processor custom **********************************************************************************************************/
    class PostProcessorCustom
    {
    protected:
        virtual void execute(Char c, Image i);
    };
    
    /* post processor list ************************************************************************************************************/
    template<typename T>
    class PostProcessorList : public PostProcessorCustom,
                              public std::list<T>
    {
    protected:
        virtual void execute(Char c, Image i);
    public:
        PostProcessorList(const Context& context);
    };
    
    /* font ***************************************************************************************************************************/
    class Font
    {
    public:
        struct Names
        {
            std::string fontname;
            std::string copyright;
            std::string facename;
            std::string stylename;
            std::string fullname;
        };
    private:
        const Library::Impl&    _impl;
        FontHandle              _handle;
        FontMetric              _metric;
        Names                   _names;        
        PostProcessor*          _postProcessor;
        Font(const Font&) = delete;
    public:
        FontHandle          getHandle() const;
        const Names&        getNames() const;
        const FontMetric&   getMetric() const;
        PostProcessor*      getPostProcessor() const;
        int                 getTabWidth() const;
        int                 getCharSpacing() const;
        int                 getLineSpacing() const;
        
        void    setPostProcessor(PostProcessor* value);
        void    setTabWidth(int value);
        void    setCharSpacing(int value);
        void    setLineSpacing(int value);
        
        Font(FontHandle handle);
        virtual ~Font();
    };
    typedef std::unique_ptr<Font> FontPtrU;
    
    /* font creator *******************************************************************************************************************/
    class FontCreator
    {
    private:
        const Library::Impl&    _impl;
        FontCreatorHandle       _handle;
        FontCreator(const FontCreator&);
    protected:
        FontCreator(FontCreatorHandle handle);
    public:
        FontCreatorHandle getHandle() const;
        
        FontPtrU getFontByName  (const std::string& fontname, int size, FontStyles styles, AntiAliasing antiAliasing);
        FontPtrU getFontByFile  (const std::string& filename, int size, FontStyles styles, AntiAliasing antiAliasing);
        FontPtrU getFontByStream(const std::istream& stream,  int size, FontStyles styles, AntiAliasing antiAliasing);
    };
    
    /* font creator GDI ***************************************************************************************************************/
    class FontCreatorGDI
    {
    public:
        FontCreatorGDI(const Context& context);
    };
    
    /* font creator free type *********************************************************************************************************/
    class FontCreatorFreeType
    {
    public:
        FontCreatorFreeType(const Context& context);
    };
    
    /* text block *********************************************************************************************************************/
    class TextBlock
    {
    private:
        const Library::Impl&    _impl;
        TextBlockHandle         _handle;
        Font*                   _font;
        TextBlock(const TextBlock&);
    public:
        TextBlockHandle getHandle() const;
        Rect            getRect() const;
        int             getWidth() const;
        int             getHeight() const;
        BlockFlags      getFlags() const;
        int             getTop() const;
        int             getLeft() const;
        VertAlign       getVertAlign() const;
        HorzAlign       getHorzAlign() const;
        Clipping        getClipping() const;
        Color4f         getColor() const;
        Font*           getFont() const;
        
        void setTop(int value);
        void setLeft(int value);
        void setVertAlign(VertAlign value);
        void setHorzAlign(HorzAlign value);
        void setClipping(Clipping value);
        void setColor(const Color4f& value);
        void setFont(Font* font);
        
        int  getActualBlockHeight() const;
        void textOutA(const char* text);
        void textOutA(const std::string& text);
        void textOutW(const WideChar* text);
        void textOutW(const std::wstring& text);
        
        int getTextWidthA(const char* text);
        int getTextWidthA(const std::string& text);
        int getTextWidthW(const WideChar* text);
        int getTextWidthW(const std::wstring& text);
        
        TextBlock(TextBlockHandle handle);
        virtual ~TextBlock();
    };
    typedef std::unique_ptr<TextBlock> TextBlockPtrU;
    
    /* renderer ***********************************************************************************************************************/
    class Renderer
    {
    private:
        RendererHandle _handle;
        Renderer(const Renderer&) = delete;
    protected:
        const Library::Impl& _impl;    
        Renderer(RendererHandle handle);
    public:
        RendererHandle getHandle() const;
        
        TextBlockPtrU   beginBlock(int top, int left, int width, int height, BlockFlags flags);
        void            endBlock(TextBlockPtrU block);
        void            abortBlock(TextBlockPtrU block);
        
        int getTextWidthA(Font* font, const char* text);
        int getTextWidthA(Font* font, const std::string& text);
        int getTextWidthW(Font* font, const WideChar* text);
        int getTextWidthW(Font* font, const std::wstring& text);
        
        virtual ~Renderer();
    };
    
    /* renderer OpenGL ****************************************************************************************************************/
    class RendererOpenGL : public Renderer
    {
    public:
        RendererOpenGL(const Context& context, Format format);
    };
    
    /* renderer OpenGLES **************************************************************************************************************/
    class RendererOpenGLES : public Renderer
    {
    public:
        RendererOpenGLES(const Context& context, Format format);
    };
    
    /* renderer custom ****************************************************************************************************************/
    class RendererCustom : public Renderer
    {
    protected:
        Position    _drawPos;
        Color4f     _color;
        
        virtual void        beginRender();
        virtual void        endRender();
        virtual Position    getDrawPos();
        virtual void        setDrawPos(const Position& value);
        virtual void        moveDrawPos(const Position& offset);
        virtual void        setColor(const Color4f& color);
        virtual void        render(RenderRef ref, int forcedWidth = 0);
        
        virtual RenderRef   createRenderRef(Char& c, const Image& img);
        virtual void        freeRenderRef(RenderRef ref);
    public:
        RendererCustom(const Context& context, Format format);
    };
}

/**********************************************************************************************************************************/
/* private implementation                                                                                                         */
/**********************************************************************************************************************************/
#if defined(LTS_WINDOWS)
lts::Library::Handle libOpen(const char* name)
    { return LoadLibrary(name); };

template <typename T>
T getAddr(lts::Library::Handle handle, const char* name)
    { return reinterpret_cast<T>(GetProcAddress(handle, name)); };

int libClose(lts::Library::Handle handle)
    { return FreeLibrary(handle); };

#elif defined(LTS_LINUX)
lts::Library::Handle libOpen(const char* name)
    { return dlopen(name, RTLD_LAZY); };

template <typename T>
T getAddr(lts::Library::Handle handle, const char* name)
    { return reinterpret_cast<T>(dlsym(handle, name)); };

int libClose(lts::Library::Handle handle)
    { return !dlclose(handle); };

#else
#   error "unknown operation system"
#endif

/* Library::Impl ******************************************************************************************************************/
struct lts::Library::Impl
{
public: /* stream */
    struct StreamData
    {
        enum class Origin : uint32_t
        {
            Begin   = 0,
            Current = 1,
            End     = 2
        };
        static_assert(sizeof(Origin) == 4, "size of lts::StreamOrigin should be 4");
        
        typedef int (WINAPI *stream_read_t)(void* args, void* buffer, int count);
        typedef int (WINAPI *stream_seek_t)(void* args, Origin origin, int offset);
        
        void*           args;
        stream_read_t   read;
        stream_seek_t   seek;
    };
    
public: /* custom post processor */
    struct PostProcessorData
    {
        typedef void (WINAPI *post_processor_execute_t)(lts::CharHandle charHandle, lts::ImageHandle imageHandle);
        
        void*                       args;
        post_processor_execute_t    execute;
    };
    
public: /* custom renderer */
    struct RendererCustomData
    {
        typedef void            (WINAPI *renderer_begin_render_t)        (void* args);
        typedef void            (WINAPI *renderer_end_render_t)          (void* args);
        typedef lts::Position   (WINAPI *renderer_get_draw_pos_t)        (void* args);
        typedef void            (WINAPI *renderer_set_draw_pos_t)        (lts::Position value, void* args);
        typedef void            (WINAPI *renderer_move_draw_pos_t)       (lts::Position value, void* args);
        typedef void            (WINAPI *renderer_set_color_t)           (lts::Color4f value, void* args);
        typedef void            (WINAPI *renderer_render)                (void* ref, int forcedWidth, void* args);
        typedef void*           (WINAPI *renderer_create_ref)            (lts::CharHandle charHandle, lts::ImageHandle imageHandle, void* args);
        typedef void            (WINAPI *renderer_free_ref)              (void* ref, void* args);
        
        void*                               args;
        
        renderer_begin_render_t     beginRender;
        renderer_end_render_t       endRender;
        renderer_get_draw_pos_t     getDrawPos;
        renderer_set_draw_pos_t     setDrawPos;
        renderer_move_draw_pos_t    moveDrawPos;
        renderer_set_color_t        setColor;
        renderer_render             render;
        
        renderer_create_ref         createRef;
        renderer_free_ref           freeRef;
    };
    
public: /* callbacks */
    typedef void (WINAPI *image_load_callback_t) (lts::ImageHandle handle, int x, int y, lts::Color4f& pixel, void* args);
    typedef void (WINAPI *image_blend_callback_t)(lts::ImageHandle handle, lts::Color4f src, lts::Color4f dst, lts::Color4f& result, void* args);
    
    typedef lts::ContextHandle      (WINAPI *context_create_t)                      ();
    typedef lts::ErrorCode          (WINAPI *context_get_code_page_t)               (lts::ContextHandle handle, lts::CodePage& value);
    typedef lts::ErrorCode          (WINAPI *context_get_default_char_t)            (lts::ContextHandle handle, WideChar& value);
    typedef lts::ErrorCode          (WINAPI *context_set_code_page_t)               (lts::ContextHandle handle, lts::CodePage value);
    typedef lts::ErrorCode          (WINAPI *context_set_default_char_t)            (lts::ContextHandle handle, WideChar value);
    typedef WideChar*               (WINAPI *context_ansi_to_wide_t)                (lts::ContextHandle handle, const char* text);
    typedef lts::ErrorCode          (WINAPI *context_destroy_t)                     (lts::ContextHandle handle);
    
    typedef lts::RendererHandle     (WINAPI *renderer_create_t)                     (lts::ContextHandle handle, lts::RendererType type, lts::Format format);
    typedef lts::RendererHandle     (WINAPI *renderer_create_custom_t)              (lts::ContextHandle handle, lts::Format format, const RendererCustomData& data);
    typedef lts::TextBlockHandle    (WINAPI *renderer_begin_block_t)                (lts::RendererHandle handle, int top, int left, int width, int height, lts::BlockFlags flags);
    typedef lts::ErrorCode          (WINAPI *renderer_end_block_t)                  (lts::RendererHandle handle, lts::TextBlockHandle block);
    typedef lts::ErrorCode          (WINAPI *renderer_abort_block_t)                (lts::RendererHandle handle, lts::TextBlockHandle block);
    typedef int                     (WINAPI *renderer_get_text_width_a_t)           (lts::RendererHandle handle, lts::FontHandle font, const char* text);
    typedef int                     (WINAPI *renderer_get_text_width_w_t)           (lts::RendererHandle handle, lts::FontHandle font, const WideChar* text);
    typedef lts::ErrorCode          (WINAPI *renderer_destroy_t)                    (lts::RendererHandle handle);
    
    typedef lts::FontCreatorHandle  (WINAPI *font_creator_create_t)                 (lts::ContextHandle handle, lts::FontCreatorType type);
    typedef lts::FontHandle         (WINAPI *font_creator_get_font_by_name_t)       (lts::FontCreatorHandle handle, const char* fontname, int size, lts::FontStyles style, lts::AntiAliasing antialiasing);
    typedef lts::FontHandle         (WINAPI *font_creator_get_font_by_file_t)       (lts::FontCreatorHandle handle, const char* filename, int size, lts::FontStyles style, lts::AntiAliasing antialiasing);
    typedef lts::FontHandle         (WINAPI *font_creator_get_font_by_stream_t)     (lts::FontCreatorHandle handle, StreamData* stream, int size, lts::FontStyles style, lts::AntiAliasing antialiasing);
    typedef lts::ErrorCode          (WINAPI *font_creator_destroy_t)                (lts::FontCreatorHandle handle);
    
    typedef lts::PostProcessorHandle(WINAPI *font_get_post_processor_t)             (lts::FontHandle handle);
    typedef lts::ErrorCode          (WINAPI *font_get_tab_width_t)                  (lts::FontHandle handle, int& value);
    typedef lts::ErrorCode          (WINAPI *font_get_char_spacing_t)               (lts::FontHandle handle, int& value);
    typedef lts::ErrorCode          (WINAPI *font_get_line_spacing_t)               (lts::FontHandle handle, float& value);
    typedef lts::ErrorCode          (WINAPI *font_get_metric_t)                     (lts::FontHandle handle, lts::FontMetric& value);
    typedef const char*             (WINAPI *font_get_fontname_t)                   (lts::FontHandle handle);
    typedef const char*             (WINAPI *font_get_facename_t)                   (lts::FontHandle handle);
    typedef const char*             (WINAPI *font_get_stylename_t)                  (lts::FontHandle handle);
    typedef const char*             (WINAPI *font_get_fillname_t)                   (lts::FontHandle handle);
    typedef const char*             (WINAPI *font_get_copyright_t)                  (lts::FontHandle handle);
    typedef lts::ErrorCode          (WINAPI *font_set_post_processor_t)             (lts::FontHandle handle, lts::PostProcessorHandle pp);
    typedef lts::ErrorCode          (WINAPI *font_set_tab_width_t)                  (lts::FontHandle handle, int value);
    typedef lts::ErrorCode          (WINAPI *font_set_char_spacing_t)               (lts::FontHandle handle, int value);
    typedef lts::ErrorCode          (WINAPI *font_set_line_spacing_t)               (lts::FontHandle handle, float value);
    typedef lts::ErrorCode          (WINAPI *font_destroy_t)                        (lts::FontHandle handle);
    
    typedef lts::ErrorCode          (WINAPI *text_block_get_rect_t)                 (lts::TextBlockHandle handle, lts::Rect& value);
    typedef lts::ErrorCode          (WINAPI *text_block_get_width_t)                (lts::TextBlockHandle handle, int& value);
    typedef lts::ErrorCode          (WINAPI *text_block_get_height_t)               (lts::TextBlockHandle handle, int& value);
    typedef lts::ErrorCode          (WINAPI *text_block_get_flags_t)                (lts::TextBlockHandle handle, lts::BlockFlags& value);
    typedef lts::ErrorCode          (WINAPI *text_block_get_top_t)                  (lts::TextBlockHandle handle, int& value);
    typedef lts::ErrorCode          (WINAPI *text_block_get_left_t)                 (lts::TextBlockHandle handle, int& value);
    typedef lts::ErrorCode          (WINAPI *text_block_get_vert_align_t)           (lts::TextBlockHandle handle, lts::VertAlign& value);
    typedef lts::ErrorCode          (WINAPI *text_block_get_horz_align_t)           (lts::TextBlockHandle handle, lts::HorzAlign& value);
    typedef lts::ErrorCode          (WINAPI *text_block_get_clipping_t)             (lts::TextBlockHandle handle, lts::Clipping& value);
    typedef lts::ErrorCode          (WINAPI *text_block_get_color_t)                (lts::TextBlockHandle handle, lts::Color4f& value);
    typedef lts::ErrorCode          (WINAPI *text_block_get_font_t)                 (lts::TextBlockHandle handle, lts::FontHandle& value);
    typedef lts::ErrorCode          (WINAPI *text_block_set_top_t)                  (lts::TextBlockHandle handle, int value);
    typedef lts::ErrorCode          (WINAPI *text_block_set_left_t)                 (lts::TextBlockHandle handle, int value);
    typedef lts::ErrorCode          (WINAPI *text_block_set_vert_align_t)           (lts::TextBlockHandle handle, lts::VertAlign value);
    typedef lts::ErrorCode          (WINAPI *text_block_set_horz_align_t)           (lts::TextBlockHandle handle, lts::HorzAlign value);
    typedef lts::ErrorCode          (WINAPI *text_block_set_clipping_t)             (lts::TextBlockHandle handle, lts::Clipping value);
    typedef lts::ErrorCode          (WINAPI *text_block_set_color_t)                (lts::TextBlockHandle handle, lts::Color4f value);
    typedef lts::ErrorCode          (WINAPI *text_block_set_font_t)                 (lts::TextBlockHandle handle, lts::FontHandle value);
    typedef int                     (WINAPI *text_block_get_actual_height_t)        (lts::TextBlockHandle handle);
    typedef int                     (WINAPI *text_block_get_text_width_a_t)         (lts::TextBlockHandle handle, const char* text);
    typedef int                     (WINAPI *text_block_get_text_width_w_t)         (lts::TextBlockHandle handle, const WideChar* text);
    typedef lts::ErrorCode          (WINAPI *text_block_text_out_a_t)               (lts::TextBlockHandle handle, const char* text);
    typedef lts::ErrorCode          (WINAPI *text_block_text_out_w_t)               (lts::TextBlockHandle handle, const WideChar* text);
    typedef lts::ErrorCode          (WINAPI *text_block_destroy_t)                  (lts::TextBlockHandle handle);
    
    typedef lts::ImageHandle        (WINAPI *image_create_t)                        (lts::ContextHandle handle);
    typedef lts::ErrorCode          (WINAPI *image_is_empty_t)                      (lts::ImageHandle handle, bool& value);
    typedef int                     (WINAPI *image_get_width_t)                     (lts::ImageHandle handle);
    typedef int                     (WINAPI *image_get_height_t)                    (lts::ImageHandle handle);
    typedef int                     (WINAPI *image_get_line_size_t)                 (lts::ImageHandle handle);
    typedef int                     (WINAPI *image_get_data_size_t)                 (lts::ImageHandle handle);
    typedef lts::ErrorCode          (WINAPI *image_get_format_t)                    (lts::ImageHandle handle, lts::Format& value);
    typedef void*                   (WINAPI *image_get_data_t)                      (lts::ImageHandle handle);
    typedef void*                   (WINAPI *image_get_scanline_t)                  (lts::ImageHandle handle, int index);
    typedef lts::ErrorCode          (WINAPI *image_get_pixel_at_t)                  (lts::ImageHandle handle, int x, int y, lts::Color4f pixel);
    typedef lts::ErrorCode          (WINAPI *image_assign_t)                        (lts::ImageHandle handle, lts::ImageHandle source);
    typedef lts::ErrorCode          (WINAPI *image_create_empty_t)                  (lts::ImageHandle handle, lts::Format format, int width, int height);
    typedef lts::ErrorCode          (WINAPI *image_load_from_func_t)                (lts::ImageHandle handle, image_load_callback_t callback, void* args);
    typedef lts::ErrorCode          (WINAPI *image_resize_t)                        (lts::ImageHandle handle, int width, int height, int x, int y);
    typedef lts::ErrorCode          (WINAPI *image_fill_color_t)                    (lts::ImageHandle handle, lts::Color4f color, lts::ColorChannels mask, lts::ImageModes modes);
    typedef lts::ErrorCode          (WINAPI *image_fill_pattern_t)                  (lts::ImageHandle handle, lts::ImageHandle pattern, int x, int y, lts::ColorChannels mask, lts::ImageModes modes);
    typedef lts::ErrorCode          (WINAPI *image_blend_t)                         (lts::ImageHandle handle, lts::ImageHandle source, int x, int y, image_blend_callback_t callback, void* args);
    typedef lts::ErrorCode          (WINAPI *image_blur_t)                          (lts::ImageHandle handle, float horzRad, float horzStr, float vertRad, float vertStr, lts::ColorChannels mask);
    typedef lts::ErrorCode          (WINAPI *image_destroy_t)                       (lts::ImageHandle handle);
    
    typedef lts::ErrorCode          (WINAPI *post_processor_add_range_t)            (lts::PostProcessorHandle handle, lts::CharRangeUsage usage, WideChar start, wchar_t stop);
    typedef lts::ErrorCode          (WINAPI *post_processor_add_chars_t)            (lts::PostProcessorHandle handle, lts::CharRangeUsage usage, const WideChar* chars);
    typedef lts::ErrorCode          (WINAPI *post_processor_clear_ranges_t)         (lts::PostProcessorHandle handle);
    typedef lts::ErrorCode          (WINAPI *post_processor_execute_t)              (lts::PostProcessorHandle handle, lts::CharHandle charHandle, lts::ImageHandle image);
    typedef lts::PostProcessorHandle(WINAPI *post_processor_fill_color_create_t)    (lts::PostProcessorHandle handle, lts::Color4f color, lts::ImageModes modes, lts::ColorChannels channels);
    typedef lts::PostProcessorHandle(WINAPI *post_processor_fill_pattern_create_t)  (lts::PostProcessorHandle handle, lts::ImageHandle pattern, bool ownsPattern, lts::Position position, lts::ImageModes modes, lts::ColorChannels channels);
    typedef lts::PostProcessorHandle(WINAPI *post_processor_border_create_t)        (lts::PostProcessorHandle handle, float width, float strength, lts::Color4f color, bool keepSize);
    typedef lts::PostProcessorHandle(WINAPI *post_processor_shadow_create_t)        (lts::PostProcessorHandle handle, float radius, float strength, lts::Position offset, lts::Color4f color);
    typedef lts::PostProcessorHandle(WINAPI *post_processor_custom_create_t)        (lts::PostProcessorHandle handle, const PostProcessorData& data);
    typedef lts::ErrorCode          (WINAPI *post_processor_destroy_t)              (lts::PostProcessorHandle handle);
    
    typedef lts::ErrorCode          (WINAPI *char_get_char_code_t)                  (lts::CharHandle handle, WideChar& value);
    typedef lts::ErrorCode          (WINAPI *char_get_glyph_metric_t)               (lts::CharHandle handle, lts::GlyphMetric& value);
    typedef lts::ErrorCode          (WINAPI *char_set_glyph_metric_t)               (lts::CharHandle handle, lts::GlyphMetric value);

    typedef lts::ErrorCode          (WINAPI *initialize_t)                          ();
    typedef lts::ErrorCode          (WINAPI *get_last_error_code_t)                 ();
    typedef const char*             (WINAPI *get_last_error_msg_t)                  ();
    typedef lts::ErrorCode          (WINAPI *finalize_t)                            ();
    
private:
    lts::Library::Handle _handle;
    
    template <typename T>
    inline void loadProc(T& proc, const char* name)
    {
        proc = getAddr<T>(_handle, name);
        if (!proc)
            throw lts::Exception(std::string("unable to load method from library: ") + name, lts::ErrorCode::InvalidMethodName);
    }

    
public:
    context_create_t                        context_create;
    context_get_code_page_t                 context_get_code_page;
    context_get_default_char_t              context_get_default_char;
    context_set_code_page_t                 context_set_code_page;
    context_set_default_char_t              context_set_default_char;
    context_ansi_to_wide_t                  context_ansi_to_wide;
    context_destroy_t                       context_destroy;
    
    renderer_create_t                       renderer_create;
    renderer_create_custom_t                renderer_create_custom;
    renderer_begin_block_t                  renderer_begin_block;
    renderer_end_block_t                    renderer_end_block;
    renderer_abort_block_t                  renderer_abort_block;
    renderer_get_text_width_a_t             renderer_get_text_width_a;
    renderer_get_text_width_w_t             renderer_get_text_width_w;
    renderer_destroy_t                      renderer_destroy;
    
    font_creator_create_t                   font_creator_create;
    font_creator_get_font_by_name_t         font_creator_get_font_by_name;
    font_creator_get_font_by_file_t         font_creator_get_font_by_file;
    font_creator_get_font_by_stream_t       font_creator_get_font_by_stream;
    font_creator_destroy_t                  font_creator_destroy;
    
    font_get_post_processor_t               font_get_post_processor;
    font_get_tab_width_t                    font_get_tab_width;
    font_get_char_spacing_t                 font_get_char_spacing;
    font_get_line_spacing_t                 font_get_line_spacing;
    font_get_metric_t                       font_get_metric;
    font_get_fontname_t                     font_get_fontname;
    font_get_facename_t                     font_get_facename;
    font_get_stylename_t                    font_get_stylename;
    font_get_fillname_t                     font_get_fillname;
    font_get_copyright_t                    font_get_copyright;
    font_set_post_processor_t               font_set_post_processor;
    font_set_tab_width_t                    font_set_tab_width;
    font_set_char_spacing_t                 font_set_char_spacing;
    font_set_line_spacing_t                 font_set_line_spacing;
    font_destroy_t                          font_destroy;
    
    text_block_get_rect_t                   text_block_get_rect;
    text_block_get_width_t                  text_block_get_width;
    text_block_get_height_t                 text_block_get_height;
    text_block_get_flags_t                  text_block_get_flags;
    text_block_get_top_t                    text_block_get_top;
    text_block_get_left_t                   text_block_get_left;
    text_block_get_vert_align_t             text_block_get_vert_align;
    text_block_get_horz_align_t             text_block_get_horz_align;
    text_block_get_clipping_t               text_block_get_clipping;
    text_block_get_color_t                  text_block_get_color;
    text_block_get_font_t                   text_block_get_font;
    text_block_set_top_t                    text_block_set_top;
    text_block_set_left_t                   text_block_set_left;
    text_block_set_vert_align_t             text_block_set_vert_align;
    text_block_set_horz_align_t             text_block_set_horz_align;
    text_block_set_clipping_t               text_block_set_clipping;
    text_block_set_color_t                  text_block_set_color;
    text_block_set_font_t                   text_block_set_font;
    text_block_get_actual_height_t          text_block_get_actual_height;
    text_block_get_text_width_a_t           text_block_get_text_width_a;
    text_block_get_text_width_w_t           text_block_get_text_width_w;
    text_block_text_out_a_t                 text_block_text_out_a;
    text_block_text_out_w_t                 text_block_text_out_w;
    text_block_destroy_t                    text_block_destroy;
    
    image_create_t                          image_create;
    image_is_empty_t                        image_is_empty;
    image_get_width_t                       image_get_width;
    image_get_height_t                      image_get_height;
    image_get_line_size_t                   image_get_line_size;
    image_get_data_size_t                   image_get_data_size;
    image_get_format_t                      image_get_format;
    image_get_data_t                        image_get_data;
    image_get_scanline_t                    image_get_scanline;
    image_get_pixel_at_t                    image_get_pixel_at;
    image_assign_t                          image_assign;
    image_create_empty_t                    image_create_empty;
    image_load_from_func_t                  image_load_from_func;
    image_resize_t                          image_resize;
    image_fill_color_t                      image_fill_color;
    image_fill_pattern_t                    image_fill_pattern;
    image_blend_t                           image_blend;
    image_blur_t                            image_blur;
    image_destroy_t                         image_destroy;
    
    post_processor_add_range_t              post_processor_add_range;
    post_processor_add_chars_t              post_processor_add_chars;
    post_processor_clear_ranges_t           post_processor_clear_ranges;
    post_processor_execute_t                post_processor_execute;
    post_processor_fill_color_create_t      post_processor_fill_color_create;
    post_processor_fill_pattern_create_t    post_processor_fill_pattern_create;
    post_processor_border_create_t          post_processor_border_create;
    post_processor_shadow_create_t          post_processor_shadow_create;
    post_processor_custom_create_t          post_processor_custom_create;
    post_processor_destroy_t                post_processor_destroy;
    
    char_get_char_code_t                    char_get_char_code;
    char_get_glyph_metric_t                 char_get_glyph_metric;
    char_set_glyph_metric_t                 char_set_glyph_metric;
    
    initialize_t                            initialize;
    get_last_error_code_t                   get_last_error_code;
    get_last_error_msg_t                    get_last_error_msg;
    finalize_t                              finalize;
    
public:
    Impl(lts::Library::Handle handle) :
        _handle                             (handle),
        
        context_create                      (NULL),
        context_get_code_page               (NULL),
        context_get_default_char            (NULL),
        context_set_code_page               (NULL),
        context_set_default_char            (NULL),
        context_ansi_to_wide                (NULL),
        context_destroy                     (NULL),
        
        renderer_create                     (NULL),
        renderer_create_custom              (NULL),
        renderer_begin_block                (NULL),
        renderer_end_block                  (NULL),
        renderer_abort_block                (NULL),
        renderer_get_text_width_a           (NULL),
        renderer_get_text_width_w           (NULL),
        renderer_destroy                    (NULL),
        
        font_creator_create                 (NULL),
        font_creator_get_font_by_name       (NULL),
        font_creator_get_font_by_file       (NULL),
        font_creator_get_font_by_stream     (NULL),
        font_creator_destroy                (NULL),
        
        font_get_post_processor             (NULL),
        font_get_tab_width                  (NULL),
        font_get_char_spacing               (NULL),
        font_get_line_spacing               (NULL),
        font_get_metric                     (NULL),
        font_get_fontname                   (NULL),
        font_get_facename                   (NULL),
        font_get_stylename                  (NULL),
        font_get_fillname                   (NULL),
        font_get_copyright                  (NULL),
        font_set_post_processor             (NULL),
        font_set_tab_width                  (NULL),
        font_set_char_spacing               (NULL),
        font_set_line_spacing               (NULL),
        font_destroy                        (NULL),
        
        text_block_get_rect                 (NULL),
        text_block_get_width                (NULL),
        text_block_get_height               (NULL),
        text_block_get_flags                (NULL),
        text_block_get_top                  (NULL),
        text_block_get_left                 (NULL),
        text_block_get_vert_align           (NULL),
        text_block_get_horz_align           (NULL),
        text_block_get_clipping             (NULL),
        text_block_get_color                (NULL),
        text_block_get_font                 (NULL),
        text_block_set_top                  (NULL),
        text_block_set_left                 (NULL),
        text_block_set_vert_align           (NULL),
        text_block_set_horz_align           (NULL),
        text_block_set_clipping             (NULL),
        text_block_set_color                (NULL),
        text_block_set_font                 (NULL),
        text_block_get_actual_height        (NULL),
        text_block_get_text_width_a         (NULL),
        text_block_get_text_width_w         (NULL),
        text_block_text_out_a               (NULL),
        text_block_text_out_w               (NULL),
        text_block_destroy                  (NULL),
        
        image_create                        (NULL),
        image_is_empty                      (NULL),
        image_get_width                     (NULL),
        image_get_height                    (NULL),
        image_get_line_size                 (NULL),
        image_get_data_size                 (NULL),
        image_get_format                    (NULL),
        image_get_data                      (NULL),
        image_get_scanline                  (NULL),
        image_get_pixel_at                  (NULL),
        image_assign                        (NULL),
        image_create_empty                  (NULL),
        image_load_from_func                (NULL),
        image_resize                        (NULL),
        image_fill_color                    (NULL),
        image_fill_pattern                  (NULL),
        image_blend                         (NULL),
        image_blur                          (NULL),
        image_destroy                       (NULL),
        
        post_processor_add_range            (NULL),
        post_processor_add_chars            (NULL),
        post_processor_clear_ranges         (NULL),
        post_processor_execute              (NULL),
        post_processor_fill_color_create    (NULL),
        post_processor_fill_pattern_create  (NULL),
        post_processor_border_create        (NULL),
        post_processor_shadow_create        (NULL),
        post_processor_custom_create        (NULL),
        post_processor_destroy              (NULL),
        
        char_get_char_code                  (NULL),
        char_get_glyph_metric               (NULL),
        char_set_glyph_metric               (NULL),
        
        get_last_error_code                 (NULL),
        get_last_error_msg                  (NULL)
    {
        loadProc(context_create,                        "ltsContextCreate");
        loadProc(context_get_code_page,                 "ltsContextGetCodePage");
        loadProc(context_get_default_char,              "ltsContextGetDefaultChar");
        loadProc(context_set_code_page,                 "ltsContextSetCodePage");
        loadProc(context_set_default_char,              "ltsContextSetDefaultChar");
        loadProc(context_ansi_to_wide,                  "ltsContextAnsiToWide");
        loadProc(context_destroy,                       "ltsContextDestroy");
        
        loadProc(renderer_create,                       "ltsRendererCreate");
        loadProc(renderer_create_custom,                "ltsRendererCustomCreate");
        loadProc(renderer_begin_block,                  "ltsRendererBeginBlock");
        loadProc(renderer_end_block,                    "ltsRendererEndBlock");
        loadProc(renderer_abort_block,                  "ltsRendererAbortBlock");
        loadProc(renderer_get_text_width_a,             "ltsRendererGetTextWidthA");
        loadProc(renderer_get_text_width_w,             "ltsRendererGetTextWidthW");
        loadProc(renderer_destroy,                      "ltsRendererDestroy");
        
        loadProc(font_creator_create,                   "ltsFontCreatorCreate");
        loadProc(font_creator_get_font_by_name,         "ltsFontCreatorGetFontByName");
        loadProc(font_creator_get_font_by_file,         "ltsFontCreatorGetFontByFile");
        loadProc(font_creator_get_font_by_stream,       "ltsFontCreatorGetFontByStream");
        loadProc(font_creator_destroy,                  "ltsFontCreatorDestroy");
        
        loadProc(font_get_post_processor,               "ltsFontGetPostProcessor");
        loadProc(font_get_tab_width,                    "ltsFontGetTabWidth");
        loadProc(font_get_char_spacing,                 "ltsFontGetCharSpacing");
        loadProc(font_get_line_spacing,                 "ltsFontGetLineSpacing");
        loadProc(font_get_metric,                       "ltsFontGetMetric");
        loadProc(font_get_fontname,                     "ltsFontGetFontname");
        loadProc(font_get_facename,                     "ltsFontGetFacename");
        loadProc(font_get_stylename,                    "ltsFontGetStylename");
        loadProc(font_get_fillname,                     "ltsFontGetFullname");
        loadProc(font_get_copyright,                    "ltsFontGetCopyright");
        loadProc(font_set_post_processor,               "ltsFontSetPostProcessor");
        loadProc(font_set_tab_width,                    "ltsFontSetTabWidth");
        loadProc(font_set_char_spacing,                 "ltsFontSetCharSpacing");
        loadProc(font_set_line_spacing,                 "ltsFontSetLineSpacing");
        loadProc(font_destroy,                          "ltsFontDestroy");
        
        loadProc(text_block_get_rect,                   "ltsTextBlockGetRect");
        loadProc(text_block_get_width,                  "ltsTextBlockGetWidth");
        loadProc(text_block_get_height,                 "ltsTextBlockGetHeight");
        loadProc(text_block_get_flags,                  "ltsTextBlockGetFlags");
        loadProc(text_block_get_top,                    "ltsTextBlockGetTop");
        loadProc(text_block_get_left,                   "ltsTextBlockGetLeft");
        loadProc(text_block_get_vert_align,             "ltsTextBlockGetVertAlign");
        loadProc(text_block_get_horz_align,             "ltsTextBlockGetHorzAlign");
        loadProc(text_block_get_clipping,               "ltsTextBlockGetClipping");
        loadProc(text_block_get_color,                  "ltsTextBlockGetColor");
        loadProc(text_block_get_font,                   "ltsTextBlockGetFont");
        loadProc(text_block_set_top,                    "ltsTextBlockSetTop");
        loadProc(text_block_set_left,                   "ltsTextBlockSetLeft");
        loadProc(text_block_set_vert_align,             "ltsTextBlockSetVertAlign");
        loadProc(text_block_set_horz_align,             "ltsTextBlockSetHorzAlign");
        loadProc(text_block_set_clipping,               "ltsTextBlockSetClipping");
        loadProc(text_block_set_color,                  "ltsTextBlockSetColor");
        loadProc(text_block_set_font,                   "ltsTextBlockSetFont");
        loadProc(text_block_get_actual_height,          "ltsTextBlockGetActualHeight");
        loadProc(text_block_get_text_width_a,           "ltsTextBlockGetTextWidthA");
        loadProc(text_block_get_text_width_w,           "ltsTextBlockGetTextWidthW");
        loadProc(text_block_text_out_a,                 "ltsTextBlockTextOutA");
        loadProc(text_block_text_out_w,                 "ltsTextBlockTextOutW");
        loadProc(text_block_destroy,                    "ltsTextBlockDestroy");
        
        loadProc(image_create,                          "ltsImageCreate");
        loadProc(image_is_empty,                        "ltsImageIsEmpty");
        loadProc(image_get_width,                       "ltsImageGetWidth");
        loadProc(image_get_height,                      "ltsImageGetHeight");
        loadProc(image_get_line_size,                   "ltsImageGetLineSize");
        loadProc(image_get_data_size,                   "ltsImageGetDataSize");
        loadProc(image_get_format,                      "ltsImageGetFormat");
        loadProc(image_get_data,                        "ltsImageGetData");
        loadProc(image_get_scanline,                    "ltsImageGetScanline");
        loadProc(image_get_pixel_at,                    "ltsImageGetPixelAt");
        loadProc(image_assign,                          "ltsImageAssign");
        loadProc(image_create_empty,                    "ltsImageCreateEmpty");
        loadProc(image_load_from_func,                  "ltsImageLoadFromFunc");
        loadProc(image_resize,                          "ltsImageResize");
        loadProc(image_fill_color,                      "ltsImageFillColor");
        loadProc(image_fill_pattern,                    "ltsImageFillPattern");
        loadProc(image_blend,                           "ltsImageBlend");
        loadProc(image_blur,                            "ltsImageBlur");
        loadProc(image_destroy,                         "ltsImageDestroy");
        
        loadProc(post_processor_add_range,              "ltsPostProcessorAddRange");
        loadProc(post_processor_add_chars,              "ltsPostProcessorAddChars");
        loadProc(post_processor_clear_ranges,           "ltsPostProcessorClearRanges");
        loadProc(post_processor_execute,                "ltsPostProcessorExecute");
        loadProc(post_processor_fill_color_create,      "ltsPostProcessorFillColorCreate");
        loadProc(post_processor_fill_pattern_create,    "ltsPostProcessorFillPatterCreate");
        loadProc(post_processor_border_create,          "ltsPostProcessorBorderCreate");
        loadProc(post_processor_shadow_create,          "ltsPostProcessorShadowCreate");
        loadProc(post_processor_custom_create,          "ltsPostProcessorCustomCreate");
        loadProc(post_processor_destroy,                "ltsPostProcessorDestroy");
        
        loadProc(char_get_char_code,                    "ltsCharGetCharCode");
        loadProc(char_get_glyph_metric,                 "ltsCharGetGlyphMetric");
        loadProc(char_set_glyph_metric,                 "ltsCharSetGlyphMetric");
        
        loadProc(initialize,                            "ltsInitialize");
        loadProc(get_last_error_code,                   "ltsGetLastErrorCode");
        loadProc(get_last_error_msg,                    "ltsGetLastErrorMsg");
        loadProc(finalize,                              "ltsFinalize");
        
        auto err = initialize();
        if (err != ErrorCode::None)
            throw Exception(std::string("unable to initialize library: ") + get_last_error_msg(), get_last_error_code());
    };
    
    ~Impl()
    {
        finalize();
    }
};

namespace lts
{
    template <typename T>
    T getFunc(const Library::Impl& impl, Handle handle, ErrorCode (WINAPI * const callback)(Handle, T&))
    {
        T value;
        auto err = callback(handle, value);
        if (err != ErrorCode::None)
            throw Exception(impl.get_last_error_msg(), err);
        return value;
    }
    
    int getFunc(const Library::Impl& impl, Handle handle, int (WINAPI * const callback)(Handle))
    {
        int value = callback(handle);
        if (value < 0)
            throw Exception(impl.get_last_error_msg(), impl.get_last_error_code());
        return value;
    }
    
    template <typename T>
    void setFunc(const Library::Impl& impl, Handle handle, ErrorCode (WINAPI * const callback)(Handle, T), const T& value)
    {
        auto err = callback(handle, value);
        if (err != ErrorCode::None)
            throw Exception(impl.get_last_error_msg(), err);
    }
};

/* Exception **********************************************************************************************************************/
inline lts::ErrorCode lts::Exception::getErrorCode() const
    { return _errorCode; }

inline std::string lts::Exception::getMessage() const
    { return _message; }

const char* lts::Exception::what() const throw()
    { return _message.c_str(); };

lts::Exception::Exception(std::string message, ErrorCode errorCode) : 
    _message    (message),
    _errorCode  (errorCode)
    { }

lts::Exception::~Exception() throw()
    { }

/* Library ************************************************************************************************************************/
inline const lts::Library::Impl& lts::Library::getImpl() const
    { return *_impl; };

inline lts::ErrorCode lts::Library::getLastErrorCode() const
    { return _impl->get_last_error_code(); }

inline std::string lts::Library::getLastErrorMsg() const
    { return std::string(_impl->get_last_error_msg()); }

lts::Library::Library(const std::string& libName) :
    _handle (0),
    _impl   (NULL)
{
    _handle = libOpen(libName.c_str());
    if (!_handle)
        throw Exception("unable to open shared library: " + libName, lts::ErrorCode::InvalidLibHandle);
    _impl = new Impl(_handle);
}

lts::Library::~Library()
{
    if (_impl)
    {
        delete _impl;
        _impl = NULL;
    }
    if (_handle)
    {
        libClose(_handle);
        _handle = NULL;
    }    
}

/* context ************************************************************************************************************************/
inline lts::ContextHandle lts::Context::getHandle() const
    { return _handle; };
    
inline lts::CodePage lts::Context::getCodePage() const
    { return getFunc(_impl, _handle, _impl.context_get_code_page); };

inline lts::WideChar lts::Context::getDefaultChar() const
    { return getFunc(_impl, _handle, _impl.context_get_default_char); };

inline void lts::Context::setCodePage(const CodePage value)
    { setFunc(_impl, _handle, _impl.context_set_code_page, value); };
    
inline void lts::Context::setDefaultChar(const WideChar value)
    { setFunc(_impl, _handle, _impl.context_set_default_char, value); };

lts::Context::Context(const Library& library) :
    _handle (NULL),
    _impl   (library.getImpl())
{
    _handle = _impl.context_create();
    if (!_handle)
        throw Exception(_impl.get_last_error_msg(), _impl.get_last_error_code());
};

/* char ***************************************************************************************************************************/
inline lts::CharHandle lts::Char::getHandle() const
    { return _handle; }

inline lts::WideChar lts::Char::getCharCode() const
    { return getFunc(_impl, _handle, _impl.char_get_char_code); };
    
inline lts::GlyphMetric lts::Char::getGlyphMetric() const
    { return getFunc(_impl, _handle, _impl.char_get_glyph_metric); };
    
inline void lts::Char::setGlyphMetric(const GlyphMetric& value)
    { setFunc(_impl, _handle, _impl.char_set_glyph_metric, value); };

lts::Char::Char(const Library::Impl& impl, CharHandle handle) :
    _impl   (impl),
    _handle (handle)
    { };

/* image **************************************************************************************************************************/
inline lts::ImageHandle lts::Image::getHandle() const
    { return _handle; };
    
inline bool lts::Image::getIsEmpty() const
    { return getFunc(_impl, _handle, _impl.image_is_empty); };

inline int lts::Image::getWidth() const
    { return getFunc(_impl, _handle, _impl.image_get_width); };

inline int lts::Image::getHeight() const
    { return getFunc(_impl, _handle, _impl.image_get_height); };

inline int lts::Image::getLineSize() const
    { return getFunc(_impl, _handle, _impl.image_get_line_size); };

inline int lts::Image::getDataSize() const
    { return getFunc(_impl, _handle, _impl.image_get_data_size); };

inline lts::Format lts::Image::getFormat() const
    { return getFunc(_impl, _handle, _impl.image_get_format); };

inline void* lts::Image::getData() const
    { return _impl.image_get_data(_handle); }

inline void* lts::Image::getScanline(int index) const
    { return _impl.image_get_scanline(_handle, index); }

bool lts::Image::getPixelAt(int x, int y, Color4f& color) const
{
    auto err = _impl.image_get_pixel_at(_handle, x, y, color);
    if (err == ErrorCode::InvalidValue)
        return false;
    else if (err == ErrorCode::None)
        return true;
    throw Exception(_impl.get_last_error_msg(), err);
};

inline void lts::Image::assign(const Image& image)
    { setFunc(_impl, _handle, _impl.image_assign, image.getHandle()); };

void lts::Image::createEmpty(Format format, int width, int height)
{
    auto err = _impl.image_create_empty(_handle, format, width, height);
    if (err != ErrorCode::None)
        throw Exception(_impl.get_last_error_msg(), err);
};

void lts::Image::loadFromFunc(LoadCallback callback, void* args)
{
    LoadArgs la;
    la.callback = callback;
    la.args     = args;
    la.image    = this;
    _impl.image_load_from_func(_handle, &lts::Image::loadCallback, &la);
};

void lts::Image::loadFromFunc(LoadFunction func)
{
    LoadArgs la;
    la.func     = &func;
    la.image    = this;
    _impl.image_load_from_func(_handle, &lts::Image::loadCallback, &la);
};

void lts::Image::resize(int width, int height, int x, int y)
{
    auto err = _impl.image_resize(_handle, width, height, x, y);
    if (err != ErrorCode::None)
        throw Exception(_impl.get_last_error_msg(), err);
};

void lts::Image::fillColor(Color4f color, ColorChannels mask, ImageModes modes)
{
    auto err = _impl.image_fill_color(_handle, color, mask, modes);
    if (err != ErrorCode::None)
        throw Exception(_impl.get_last_error_msg(), err);
};

void lts::Image::fillPattern(const Image& pattern, int x, int y, ColorChannels mask, ImageModes modes)
{
    auto err = _impl.image_fill_pattern(_handle, pattern.getHandle(), x, y, mask, modes);
    if (err != ErrorCode::None)
        throw Exception(_impl.get_last_error_msg(), err);
};

void lts::Image::blend(const Image& image, int x, int y, BlendCallback callback, void* args)
{ 
    BlendArgs ba;
    ba.callback = callback;
    ba.args     = args;
    ba.image    = this;
    _impl.image_load_from_func(_handle, &lts::Image::loadCallback, &ba);
};

void lts::Image::blend(const Image& image, int x, int y, BlendFunction func)
{
    BlendArgs ba;
    ba.func     = &func;
    ba.image    = this;
    _impl.image_load_from_func(_handle, &lts::Image::loadFunc, &ba);
};

void lts::Image::blur(float horzRad, float horzStr, float vertRad, float vertStr, ColorChannels mask)
{
    auto err = _impl.image_blur(_handle, horzRad, horzStr, vertRad, vertStr, mask);
    if (err != ErrorCode::None)
        throw Exception(_impl.get_last_error_msg(), err);
};

lts::Image::Image(const Library::Impl& impl, ImageHandle handle) :
    _impl       (impl),
    _handle     (handle),
    _ownsHandle (false)
    { };
    
lts::Image::Image(const Context& context) :
    _impl       (context._impl),
    _handle     (NULL),
    _ownsHandle (true)
{
    _handle = _impl.image_create(context.getHandle());
    if (!_handle)
        throw Exception(_impl.get_last_error_msg(), _impl.get_last_error_code());
}

lts::Image::~Image()
{
    if (_ownsHandle && _handle)
        _impl.image_destroy(_handle);
}

void lts::Image::loadCallback(ImageHandle handle, int x, int y, lts::Color4f& pixel, void* args)
{
    auto la = static_cast<LoadArgs*>(args);
    la->callback(*la->image, x, y, pixel, la->args);
}

void lts::Image::loadFunc(ImageHandle handle, int x, int y, lts::Color4f& pixel, void* args)
{
    auto la = static_cast<LoadArgs*>(args);
    (*la->func)(*la->image, x, y, pixel);
}

void lts::Image::blendCallback(ImageHandle handle, lts::Color4f src, lts::Color4f dst, lts::Color4f& result, void* args)
{
    auto ba = static_cast<BlendArgs*>(args);
    result = ba->callback(*ba->image, src, dst, ba->args);
}

void lts::Image::blendFunc(ImageHandle handle, lts::Color4f src, lts::Color4f dst, lts::Color4f& result, void* args)
{
    auto ba = static_cast<BlendArgs*>(args);
    result = (*ba->func)(*ba->image, src, dst);
}

/* post processor *****************************************************************************************************************
class PostProcessor
{
private:
    const Library::Impl&    _impl;
    PostProcessorHandle     _handle;
    PostProcessor(const PostProcessor&) = delete;
protected:
    virtual void execute(Char c, Image i);
    PostProcessor(PostProcessorHandle handle);
public:
    PostProcessorHandle getHandle() const;
    
    void addRange(CharRangeUsage usage, WideChar start, WideChar stop);
    void addChars(CharRangeUsage usage, WideChar* chars);
    void clearRanges();
    
    virtual ~PostProcessor();
};

/* post processor fill color ******************************************************************************************************
class PostProcessorFillColor final : public PostProcessor
{
private:
    const Library::Impl&    _impl;
    Color4f                 _color;
    ImageModes              _modes;
    ColorChannels           _channels;
public:
    const Color4f&          getColor() const;
    const ImageModes&       getModes() const;
    const ColorChannels&    getChannels() const;
    
    PostProcessorFillColor(const Context& context, const Color4f& color, const ImageModes& modes, const ColorChannels& channels);
};

/* post processor fill pattern ****************************************************************************************************
class PostProcessorFillPattern final : public PostProcessor
{
private:
    const Image&    _pattern;
    bool            _ownsPattern;
    Position        _position;
    ImageModes      _modes;
    ColorChannels   _channels;
protected:
    const Library::Impl& _impl;
public:
    const Image&            getPattern() const;
    bool                    getOwnsPattern() const;
    const Position&         getPosition() const;
    const ImageModes&       getModes() const;
    const ColorChannels&    getChannels() const;
    
    PostProcessorFillPattern(const Context& context, const Image& pattern, bool ownsPattern,
        const Position& pos, ImageModes modes, ColorChannels channels);
    virtual ~PostProcessorFillPattern();
};

/* post processor border **********************************************************************************************************
class PostProcessorBorder final : public PostProcessor
{
private:
    float   _width;
    float   _strength;
    Color4f _color;
    bool    _keepSize;
public:
    float   getWidth() const;
    float   getStrength() const;
    Color4f getColor() const;
    bool    getKeepSize() const;
    
    PostProcessorBorder(const Context& context, float width, float strength, Color4f color, bool keepSize);
};

/* post processor shadow **********************************************************************************************************
class PostProcessorShadow final : public PostProcessor
{
private:
    float       _radius;
    float       _strength;
    Position    _position;
    Color4f     _color;
public:
    float       getRadius() const;
    float       getStrength() const;
    Position    getPosition() const;
    Color4f     getColor() const;
    
    PostProcessorShadow(const Context& context, float radius, float strength, const Position& offset, const Color4f& color);
};

/* post processor custom **********************************************************************************************************
class PostProcessorCustom
{
protected:
    virtual void execute(Char c, Image i);
};

/* post processor list ************************************************************************************************************
template<typename T>
class PostProcessorList : public PostProcessorCustom,
                          public std::list<T>
{
protected:
    virtual void execute(Char c, Image i);
public:
    PostProcessorList(const Context& context);
};

/* font ***************************************************************************************************************************
class Font
{
public:
    struct Names
    {
        std::string fontname;
        std::string copyright;
        std::string facename;
        std::string stylename;
        std::string fullname;
    };
private:
    const Library::Impl&    _impl;
    FontHandle              _handle;
    FontMetric              _metric;
    Names                   _names;        
    PostProcessor*          _postProcessor;
    Font(const Font&) = delete;
public:
    FontHandle          getHandle() const;
    const Names&        getNames() const;
    const FontMetric&   getMetric() const;
    PostProcessor*      getPostProcessor() const;
    int                 getTabWidth() const;
    int                 getCharSpacing() const;
    int                 getLineSpacing() const;
    
    void    setPostProcessor(PostProcessor* value);
    void    setTabWidth(int value);
    void    setCharSpacing(int value);
    void    setLineSpacing(int value);
    
    Font(FontHandle handle);
    virtual ~Font();
};
typedef std::unique_ptr<Font> FontPtrU;

/* font creator *******************************************************************************************************************
class FontCreator
{
private:
    const Library::Impl&    _impl;
    FontCreatorHandle       _handle;
    FontCreator(const FontCreator&);
protected:
    FontCreator(FontCreatorHandle handle);
public:
    FontCreatorHandle getHandle() const;
    
    FontPtrU getFontByName  (const std::string& fontname, int size, FontStyles styles, AntiAliasing antiAliasing);
    FontPtrU getFontByFile  (const std::string& filename, int size, FontStyles styles, AntiAliasing antiAliasing);
    FontPtrU getFontByStream(const std::istream& stream,  int size, FontStyles styles, AntiAliasing antiAliasing);
};

/* font creator GDI ***************************************************************************************************************
class FontCreatorGDI
{
public:
    FontCreatorGDI(const Context& context);
};

/* font creator free type *********************************************************************************************************
class FontCreatorFreeType
{
public:
    FontCreatorFreeType(const Context& context);
};

/* text block *********************************************************************************************************************
class TextBlock
{
private:
    const Library::Impl&    _impl;
    TextBlockHandle         _handle;
    Font*                   _font;
    TextBlock(const TextBlock&);
public:
    TextBlockHandle getHandle() const;
    Rect            getRect() const;
    int             getWidth() const;
    int             getHeight() const;
    BlockFlags      getFlags() const;
    int             getTop() const;
    int             getLeft() const;
    VertAlign       getVertAlign() const;
    HorzAlign       getHorzAlign() const;
    Clipping        getClipping() const;
    Color4f         getColor() const;
    Font*           getFont() const;
    
    void setTop(int value);
    void setLeft(int value);
    void setVertAlign(VertAlign value);
    void setHorzAlign(HorzAlign value);
    void setClipping(Clipping value);
    void setColor(const Color4f& value);
    void setFont(Font* font);
    
    int  getActualBlockHeight() const;
    void textOutA(const char* text);
    void textOutA(const std::string& text);
    void textOutW(const WideChar* text);
    void textOutW(const std::wstring& text);
    
    int getTextWidthA(const char* text);
    int getTextWidthA(const std::string& text);
    int getTextWidthW(const WideChar* text);
    int getTextWidthW(const std::wstring& text);
    
    TextBlock(TextBlockHandle handle);
    virtual ~TextBlock();
};
typedef std::unique_ptr<TextBlock> TextBlockPtrU;

/* renderer ***********************************************************************************************************************
class Renderer
{
private:
    RendererHandle _handle;
    Renderer(const Renderer&) = delete;
protected:
    const Library::Impl& _impl;    
    Renderer(RendererHandle handle);
public:
    RendererHandle getHandle() const;
    
    TextBlockPtrU   beginBlock(int top, int left, int width, int height, BlockFlags flags);
    void            endBlock(TextBlockPtrU block);
    void            abortBlock(TextBlockPtrU block);
    
    int getTextWidthA(Font* font, const char* text);
    int getTextWidthA(Font* font, const std::string& text);
    int getTextWidthW(Font* font, const WideChar* text);
    int getTextWidthW(Font* font, const std::wstring& text);
    
    virtual ~Renderer();
};

/* renderer OpenGL ****************************************************************************************************************
class RendererOpenGL : public Renderer
{
public:
    RendererOpenGL(const Context& context, Format format);
};

/* renderer OpenGLES **************************************************************************************************************
class RendererOpenGLES : public Renderer
{
public:
    RendererOpenGLES(const Context& context, Format format);
};

/* renderer custom ****************************************************************************************************************
class RendererCustom : public Renderer
{
protected:
    Position    _drawPos;
    Color4f     _color;
    
    virtual void        beginRender();
    virtual void        endRender();
    virtual Position    getDrawPos();
    virtual void        setDrawPos(const Position& value);
    virtual void        moveDrawPos(const Position& offset);
    virtual void        setColor(const Color4f& color);
    virtual void        render(RenderRef ref, int forcedWidth = 0);
    
    virtual RenderRef   createRenderRef(Char& c, const Image& img);
    virtual void        freeRenderRef(RenderRef ref);
public:
    RendererCustom(const Context& context, Format format);
};

*/

#endif /* LIB_TEXT_SUITE_HPP */