Texture font. More...

#include <OpenGl_Font.hxx>

Inheritance diagram for OpenGl_Font:

Data Structures
struct	RectI

struct	Tile
	Simple structure stores tile rectangle. More...

Public Member Functions
	OpenGl_Font (const Handle< Font_FTFont > &theFont, const TCollection_AsciiString &theKey="")
	Main constructor. More...

virtual	~OpenGl_Font ()
	Destroy object. More...

virtual void	Release (OpenGl_Context *theCtx) override
	Destroy object - will release GPU memory if any. More...

const TCollection_AsciiString &	ResourceKey () const

const Handle< Font_FTFont > &	FTFont () const

bool	IsValid () const

bool	WasInitialized () const
	Notice that this method doesn't return initialization success state. Use IsValid() instead. More...

bool	Init (const Handle< OpenGl_Context > &theCtx)
	Initialize GL resources. FreeType font instance should be already initialized! More...

float	Ascender () const

float	Descender () const

float	LineSpacing () const

bool	RenderGlyph (const Handle< OpenGl_Context > &theCtx, const Standard_Utf32Char theUChar, Tile &theGlyph)
	Render glyph to texture if not already. More...

Public Member Functions inherited from OpenGl_Resource
	OpenGl_Resource ()
	Empty constructor. More...

virtual	~OpenGl_Resource ()
	Destructor. Inheritors should call Clean (NULL) within it. More...

Public Member Functions inherited from Standard_Transient
	Standard_Transient ()
	Empty constructor. More...

	Standard_Transient (const Standard_Transient &)
	Copy constructor – does nothing. More...

Standard_Transient &	operator= (const Standard_Transient &)
	Assignment operator, needed to avoid copying reference counter. More...

virtual	~Standard_Transient ()
	Destructor must be virtual. More...

virtual void	Delete () const
	Memory deallocator for transient classes. More...

virtual const opencascade::handle< Standard_Type > &	DynamicType () const
	Returns a type descriptor about this object. More...

Standard_Boolean	IsInstance (const opencascade::handle< Standard_Type > &theType) const
	Returns a true value if this is an instance of Type. More...

Standard_Boolean	IsInstance (const Standard_CString theTypeName) const
	Returns a true value if this is an instance of TypeName. More...

Standard_Boolean	IsKind (const opencascade::handle< Standard_Type > &theType) const
	Returns true if this is an instance of Type or an instance of any class that inherits from Type. Note that multiple inheritance is not supported by OCCT RTTI mechanism. More...

Standard_Boolean	IsKind (const Standard_CString theTypeName) const
	Returns true if this is an instance of TypeName or an instance of any class that inherits from TypeName. Note that multiple inheritance is not supported by OCCT RTTI mechanism. More...

Standard_Transient *	This () const
	Returns non-const pointer to this object (like const_cast). For protection against creating handle to objects allocated in stack or call from constructor, it will raise exception Standard_ProgramError if reference counter is zero. More...

Standard_Integer	GetRefCount () const
	Get the reference counter of this object. More...

void	IncrementRefCounter () const
	Increments the reference counter of this object. More...

Standard_Integer	DecrementRefCounter () const
	Decrements the reference counter of this object; returns the decremented value. More...

Protected Member Functions
bool	renderGlyph (const Handle< OpenGl_Context > &theCtx, const Standard_Utf32Char theChar)
	Render new glyph to the texture. More...

bool	createTexture (const Handle< OpenGl_Context > &theCtx)
	Allocate new texture. More...

Protected Attributes
TCollection_AsciiString	myKey
	key of shared resource More...

Handle< Font_FTFont >	myFont
	FreeType font instance. More...

Standard_ShortReal	myAscender
	ascender provided my FT font More...

Standard_ShortReal	myDescender
	descender provided my FT font More...

Standard_ShortReal	myLineSpacing
	line spacing provided my FT font More...

Standard_Integer	myTileSizeX
	tile width More...

Standard_Integer	myTileSizeY
	tile height More...

Standard_Integer	myLastTileId
	id of last tile More...

RectI	myLastTilePx

Standard_Integer	myTextureFormat
	texture format More...

NCollection_Vector< Handle< OpenGl_Texture > >	myTextures
	array of textures More...

NCollection_Vector< Tile >	myTiles
	array of loaded tiles More...

NCollection_DataMap< Standard_Utf32Char, Standard_Integer >	myGlyphMap

Additional Inherited Members
Public Types inherited from Standard_Transient
typedef void	base_type
	Returns a type descriptor about this object. More...

Static Public Member Functions inherited from Standard_Transient
static const char *	get_type_name ()
	Returns a type descriptor about this object. More...

static const opencascade::handle< Standard_Type > &	get_type_descriptor ()
	Returns type descriptor of Standard_Transient class. More...

Detailed Description

Texture font.

Constructor & Destructor Documentation

OpenGl_Font::OpenGl_Font	(	const Handle< Font_FTFont > &	theFont,
		const TCollection_AsciiString &	theKey = `""`
	)

Main constructor.

virtual OpenGl_Font::~OpenGl_Font ( )

virtual

Destroy object.

Member Function Documentation

float OpenGl_Font::Ascender ( ) const

inline

Returns: vertical distance from the horizontal baseline to the highest character coordinate

bool OpenGl_Font::createTexture ( const Handle< OpenGl_Context > & theCtx )

protected

Allocate new texture.

float OpenGl_Font::Descender ( ) const

inline

Returns: vertical distance from the horizontal baseline to the lowest character coordinate

const Handle< Font_FTFont >& OpenGl_Font::FTFont ( ) const

inline

Returns: FreeType font instance specified on construction.

bool OpenGl_Font::Init ( const Handle< OpenGl_Context > & theCtx )

Initialize GL resources. FreeType font instance should be already initialized!

bool OpenGl_Font::IsValid ( ) const

inline

Returns: true if font was loaded successfully.

float OpenGl_Font::LineSpacing ( ) const

inline

Returns: default line spacing (the baseline-to-baseline distance)

virtual void OpenGl_Font::Release ( OpenGl_Context * theCtx )

overridevirtual

Destroy object - will release GPU memory if any.

Implements OpenGl_Resource.

bool OpenGl_Font::RenderGlyph	(	const Handle< OpenGl_Context > &	theCtx,
		const Standard_Utf32Char	theUChar,
		Tile &	theGlyph
	)

Render glyph to texture if not already.

Parameters

theCtx	active context
theUChar	unicode symbol to render
theGlyph	computed glyph position rectangle, texture ID and UV coordinates

bool OpenGl_Font::renderGlyph	(	const Handle< OpenGl_Context > &	theCtx,
		const Standard_Utf32Char	theChar
	)

protected

Render new glyph to the texture.

const TCollection_AsciiString& OpenGl_Font::ResourceKey ( ) const

inline

Returns: key of shared resource

bool OpenGl_Font::WasInitialized ( ) const

inline

Notice that this method doesn't return initialization success state. Use IsValid() instead.

Returns: true if initialization was already called.

Field Documentation

Standard_ShortReal OpenGl_Font::myAscender

protected

ascender provided my FT font

Standard_ShortReal OpenGl_Font::myDescender

protected

descender provided my FT font

Handle< Font_FTFont > OpenGl_Font::myFont

protected

FreeType font instance.

NCollection_DataMap<Standard_Utf32Char, Standard_Integer> OpenGl_Font::myGlyphMap

protected

TCollection_AsciiString OpenGl_Font::myKey

protected

key of shared resource

Standard_Integer OpenGl_Font::myLastTileId

protected

id of last tile

RectI OpenGl_Font::myLastTilePx

protected

Standard_ShortReal OpenGl_Font::myLineSpacing

protected

line spacing provided my FT font

Standard_Integer OpenGl_Font::myTextureFormat

protected

texture format

NCollection_Vector<Handle< OpenGl_Texture > > OpenGl_Font::myTextures

protected

array of textures

NCollection_Vector<Tile> OpenGl_Font::myTiles

protected

array of loaded tiles

Standard_Integer OpenGl_Font::myTileSizeX

protected

tile width

Standard_Integer OpenGl_Font::myTileSizeY

protected

tile height

The documentation for this class was generated from the following file:

OpenGl_Font.hxx

Data Structures

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Field Documentation