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ftobjs.h
/****************************************************************************
*
* ftobjs.h
*
* The FreeType private base classes (specification).
*
* Copyright (C) 1996-2019 by
* David Turner, Robert Wilhelm, and Werner Lemberg.
*
* This file is part of the FreeType project, and may only be used,
* modified, and distributed under the terms of the FreeType project
* license, LICENSE.TXT. By continuing to use, modify, or distribute
* this file you indicate that you have read the license and
* understand and accept it fully.
*
*/
/**************************************************************************
*
* This file contains the definition of all internal FreeType classes.
*
*/
#ifndef FTOBJS_H_
#define FTOBJS_H_
#include <ft2build.h>
#include FT_RENDER_H
#include FT_SIZES_H
#include FT_LCD_FILTER_H
#include FT_INTERNAL_MEMORY_H
#include FT_INTERNAL_GLYPH_LOADER_H
#include FT_INTERNAL_DRIVER_H
#include FT_INTERNAL_AUTOHINT_H
#include FT_INTERNAL_SERVICE_H
#include FT_INTERNAL_CALC_H
#ifdef FT_CONFIG_OPTION_INCREMENTAL
#include FT_INCREMENTAL_H
#endif
FT_BEGIN_HEADER
/**************************************************************************
*
* Some generic definitions.
*/
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
#ifndef NULL
#define NULL (void*)0
#endif
/**************************************************************************
*
* The min and max functions missing in C. As usual, be careful not to
* write things like FT_MIN( a++, b++ ) to avoid side effects.
*/
#define FT_MIN( a, b ) ( (a) < (b) ? (a) : (b) )
#define FT_MAX( a, b ) ( (a) > (b) ? (a) : (b) )
#define FT_ABS( a ) ( (a) < 0 ? -(a) : (a) )
/*
* Approximate sqrt(x*x+y*y) using the `alpha max plus beta min' algorithm.
* We use alpha = 1, beta = 3/8, giving us results with a largest error
* less than 7% compared to the exact value.
*/
#define FT_HYPOT( x, y ) \
( x = FT_ABS( x ), \
y = FT_ABS( y ), \
x > y ? x + ( 3 * y >> 3 ) \
: y + ( 3 * x >> 3 ) )
/* we use FT_TYPEOF to suppress signedness compilation warnings */
#define FT_PAD_FLOOR( x, n ) ( (x) & ~FT_TYPEOF( x )( (n) - 1 ) )
#define FT_PAD_ROUND( x, n ) FT_PAD_FLOOR( (x) + (n) / 2, n )
#define FT_PAD_CEIL( x, n ) FT_PAD_FLOOR( (x) + (n) - 1, n )
#define FT_PIX_FLOOR( x ) ( (x) & ~FT_TYPEOF( x )63 )
#define FT_PIX_ROUND( x ) FT_PIX_FLOOR( (x) + 32 )
#define FT_PIX_CEIL( x ) FT_PIX_FLOOR( (x) + 63 )
/* specialized versions (for signed values) */
/* that don't produce run-time errors due to integer overflow */
#define FT_PAD_ROUND_LONG( x, n ) FT_PAD_FLOOR( ADD_LONG( (x), (n) / 2 ), \
n )
#define FT_PAD_CEIL_LONG( x, n ) FT_PAD_FLOOR( ADD_LONG( (x), (n) - 1 ), \
n )
#define FT_PIX_ROUND_LONG( x ) FT_PIX_FLOOR( ADD_LONG( (x), 32 ) )
#define FT_PIX_CEIL_LONG( x ) FT_PIX_FLOOR( ADD_LONG( (x), 63 ) )
#define FT_PAD_ROUND_INT32( x, n ) FT_PAD_FLOOR( ADD_INT32( (x), (n) / 2 ), \
n )
#define FT_PAD_CEIL_INT32( x, n ) FT_PAD_FLOOR( ADD_INT32( (x), (n) - 1 ), \
n )
#define FT_PIX_ROUND_INT32( x ) FT_PIX_FLOOR( ADD_INT32( (x), 32 ) )
#define FT_PIX_CEIL_INT32( x ) FT_PIX_FLOOR( ADD_INT32( (x), 63 ) )
/*
* character classification functions -- since these are used to parse font
* files, we must not use those in <ctypes.h> which are locale-dependent
*/
#define ft_isdigit( x ) ( ( (unsigned)(x) - '0' ) < 10U )
#define ft_isxdigit( x ) ( ( (unsigned)(x) - '0' ) < 10U || \
( (unsigned)(x) - 'a' ) < 6U || \
( (unsigned)(x) - 'A' ) < 6U )
/* the next two macros assume ASCII representation */
#define ft_isupper( x ) ( ( (unsigned)(x) - 'A' ) < 26U )
#define ft_islower( x ) ( ( (unsigned)(x) - 'a' ) < 26U )
#define ft_isalpha( x ) ( ft_isupper( x ) || ft_islower( x ) )
#define ft_isalnum( x ) ( ft_isdigit( x ) || ft_isalpha( x ) )
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** C H A R M A P S ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* handle to internal charmap object */
typedef struct FT_CMapRec_* FT_CMap;
/* handle to charmap class structure */
typedef const struct FT_CMap_ClassRec_* FT_CMap_Class;
/* internal charmap object structure */
typedef struct FT_CMapRec_
{
FT_CharMapRec charmap;
FT_CMap_Class clazz;
} FT_CMapRec;
/* typecast any pointer to a charmap handle */
#define FT_CMAP( x ) ( (FT_CMap)( x ) )
/* obvious macros */
#define FT_CMAP_PLATFORM_ID( x ) FT_CMAP( x )->charmap.platform_id
#define FT_CMAP_ENCODING_ID( x ) FT_CMAP( x )->charmap.encoding_id
#define FT_CMAP_ENCODING( x ) FT_CMAP( x )->charmap.encoding
#define FT_CMAP_FACE( x ) FT_CMAP( x )->charmap.face
/* class method definitions */
typedef FT_Error
(*FT_CMap_InitFunc)( FT_CMap cmap,
FT_Pointer init_data );
typedef void
(*FT_CMap_DoneFunc)( FT_CMap cmap );
typedef FT_UInt
(*FT_CMap_CharIndexFunc)( FT_CMap cmap,
FT_UInt32 char_code );
typedef FT_UInt
(*FT_CMap_CharNextFunc)( FT_CMap cmap,
FT_UInt32 *achar_code );
typedef FT_UInt
(*FT_CMap_CharVarIndexFunc)( FT_CMap cmap,
FT_CMap unicode_cmap,
FT_UInt32 char_code,
FT_UInt32 variant_selector );
typedef FT_Int
(*FT_CMap_CharVarIsDefaultFunc)( FT_CMap cmap,
FT_UInt32 char_code,
FT_UInt32 variant_selector );
typedef FT_UInt32 *
(*FT_CMap_VariantListFunc)( FT_CMap cmap,
FT_Memory mem );
typedef FT_UInt32 *
(*FT_CMap_CharVariantListFunc)( FT_CMap cmap,
FT_Memory mem,
FT_UInt32 char_code );
typedef FT_UInt32 *
(*FT_CMap_VariantCharListFunc)( FT_CMap cmap,
FT_Memory mem,
FT_UInt32 variant_selector );
typedef struct FT_CMap_ClassRec_
{
FT_ULong size;
FT_CMap_InitFunc init;
FT_CMap_DoneFunc done;
FT_CMap_CharIndexFunc char_index;
FT_CMap_CharNextFunc char_next;
/* Subsequent entries are special ones for format 14 -- the variant */
/* selector subtable which behaves like no other */
FT_CMap_CharVarIndexFunc char_var_index;
FT_CMap_CharVarIsDefaultFunc char_var_default;
FT_CMap_VariantListFunc variant_list;
FT_CMap_CharVariantListFunc charvariant_list;
FT_CMap_VariantCharListFunc variantchar_list;
} FT_CMap_ClassRec;
#define FT_DECLARE_CMAP_CLASS( class_ ) \
FT_CALLBACK_TABLE const FT_CMap_ClassRec class_;
#define FT_DEFINE_CMAP_CLASS( \
class_, \
size_, \
init_, \
done_, \
char_index_, \
char_next_, \
char_var_index_, \
char_var_default_, \
variant_list_, \
charvariant_list_, \
variantchar_list_ ) \
FT_CALLBACK_TABLE_DEF \
const FT_CMap_ClassRec class_ = \
{ \
size_, \
init_, \
done_, \
char_index_, \
char_next_, \
char_var_index_, \
char_var_default_, \
variant_list_, \
charvariant_list_, \
variantchar_list_ \
};
/* create a new charmap and add it to charmap->face */
FT_BASE( FT_Error )
FT_CMap_New( FT_CMap_Class clazz,
FT_Pointer init_data,
FT_CharMap charmap,
FT_CMap *acmap );
/* destroy a charmap and remove it from face's list */
FT_BASE( void )
FT_CMap_Done( FT_CMap cmap );
/* add LCD padding to CBox */
FT_BASE( void )
ft_lcd_padding( FT_BBox* cbox,
FT_GlyphSlot slot,
FT_Render_Mode mode );
#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
typedef void (*FT_Bitmap_LcdFilterFunc)( FT_Bitmap* bitmap,
FT_Byte* weights );
/* This is the default LCD filter, an in-place, 5-tap FIR filter. */
FT_BASE( void )
ft_lcd_filter_fir( FT_Bitmap* bitmap,
FT_LcdFiveTapFilter weights );
#endif /* FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
/**************************************************************************
*
* @struct:
* FT_Face_InternalRec
*
* @description:
* This structure contains the internal fields of each FT_Face object.
* These fields may change between different releases of FreeType.
*
* @fields:
* max_points ::
* The maximum number of points used to store the vectorial outline of
* any glyph in this face. If this value cannot be known in advance,
* or if the face isn't scalable, this should be set to 0. Only
* relevant for scalable formats.
*
* max_contours ::
* The maximum number of contours used to store the vectorial outline
* of any glyph in this face. If this value cannot be known in
* advance, or if the face isn't scalable, this should be set to 0.
* Only relevant for scalable formats.
*
* transform_matrix ::
* A 2x2 matrix of 16.16 coefficients used to transform glyph outlines
* after they are loaded from the font. Only used by the convenience
* functions.
*
* transform_delta ::
* A translation vector used to transform glyph outlines after they are
* loaded from the font. Only used by the convenience functions.
*
* transform_flags ::
* Some flags used to classify the transform. Only used by the
* convenience functions.
*
* services ::
* A cache for frequently used services. It should be only accessed
* with the macro `FT_FACE_LOOKUP_SERVICE`.
*
* incremental_interface ::
* If non-null, the interface through which glyph data and metrics are
* loaded incrementally for faces that do not provide all of this data
* when first opened. This field exists only if
* @FT_CONFIG_OPTION_INCREMENTAL is defined.
*
* no_stem_darkening ::
* Overrides the module-level default, see @stem-darkening[cff], for
* example. FALSE and TRUE toggle stem darkening on and off,
* respectively, value~-1 means to use the module/driver default.
*
* random_seed ::
* If positive, override the seed value for the CFF 'random' operator.
* Value~0 means to use the font's value. Value~-1 means to use the
* CFF driver's default.
*
* lcd_weights ::
* lcd_filter_func ::
* These fields specify the LCD filtering weights and callback function
* for ClearType-style subpixel rendering.
*
* refcount ::
* A counter initialized to~1 at the time an @FT_Face structure is
* created. @FT_Reference_Face increments this counter, and
* @FT_Done_Face only destroys a face if the counter is~1, otherwise it
* simply decrements it.
*/
typedef struct FT_Face_InternalRec_
{
FT_Matrix transform_matrix;
FT_Vector transform_delta;
FT_Int transform_flags;
FT_ServiceCacheRec services;
#ifdef FT_CONFIG_OPTION_INCREMENTAL
FT_Incremental_InterfaceRec* incremental_interface;
#endif
FT_Char no_stem_darkening;
FT_Int32 random_seed;
#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
FT_LcdFiveTapFilter lcd_weights; /* filter weights, if any */
FT_Bitmap_LcdFilterFunc lcd_filter_func; /* filtering callback */
#endif
FT_Int refcount;
} FT_Face_InternalRec;
/**************************************************************************
*
* @struct:
* FT_Slot_InternalRec
*
* @description:
* This structure contains the internal fields of each FT_GlyphSlot
* object. These fields may change between different releases of
* FreeType.
*
* @fields:
* loader ::
* The glyph loader object used to load outlines into the glyph slot.
*
* flags ::
* Possible values are zero or FT_GLYPH_OWN_BITMAP. The latter
* indicates that the FT_GlyphSlot structure owns the bitmap buffer.
*
* glyph_transformed ::
* Boolean. Set to TRUE when the loaded glyph must be transformed
* through a specific font transformation. This is _not_ the same as
* the face transform set through FT_Set_Transform().
*
* glyph_matrix ::
* The 2x2 matrix corresponding to the glyph transformation, if
* necessary.
*
* glyph_delta ::
* The 2d translation vector corresponding to the glyph transformation,
* if necessary.
*
* glyph_hints ::
* Format-specific glyph hints management.
*
* load_flags ::
* The load flags passed as an argument to @FT_Load_Glyph while
* initializing the glyph slot.
*/
#define FT_GLYPH_OWN_BITMAP 0x1U
typedef struct FT_Slot_InternalRec_
{
FT_GlyphLoader loader;
FT_UInt flags;
FT_Bool glyph_transformed;
FT_Matrix glyph_matrix;
FT_Vector glyph_delta;
void* glyph_hints;
FT_Int32 load_flags;
} FT_GlyphSlot_InternalRec;
/**************************************************************************
*
* @struct:
* FT_Size_InternalRec
*
* @description:
* This structure contains the internal fields of each FT_Size object.
*
* @fields:
* module_data ::
* Data specific to a driver module.
*
* autohint_mode ::
* The used auto-hinting mode.
*
* autohint_metrics ::
* Metrics used by the auto-hinter.
*
*/
typedef struct FT_Size_InternalRec_
{
void* module_data;
FT_Render_Mode autohint_mode;
FT_Size_Metrics autohint_metrics;
} FT_Size_InternalRec;
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** M O D U L E S ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**************************************************************************
*
* @struct:
* FT_ModuleRec
*
* @description:
* A module object instance.
*
* @fields:
* clazz ::
* A pointer to the module's class.
*
* library ::
* A handle to the parent library object.
*
* memory ::
* A handle to the memory manager.
*/
typedef struct FT_ModuleRec_
{
FT_Module_Class* clazz;
FT_Library library;
FT_Memory memory;
} FT_ModuleRec;
/* typecast an object to an FT_Module */
#define FT_MODULE( x ) ( (FT_Module)(x) )
#define FT_MODULE_CLASS( x ) FT_MODULE( x )->clazz
#define FT_MODULE_LIBRARY( x ) FT_MODULE( x )->library
#define FT_MODULE_MEMORY( x ) FT_MODULE( x )->memory
#define FT_MODULE_IS_DRIVER( x ) ( FT_MODULE_CLASS( x )->module_flags & \
FT_MODULE_FONT_DRIVER )
#define FT_MODULE_IS_RENDERER( x ) ( FT_MODULE_CLASS( x )->module_flags & \
FT_MODULE_RENDERER )
#define FT_MODULE_IS_HINTER( x ) ( FT_MODULE_CLASS( x )->module_flags & \
FT_MODULE_HINTER )
#define FT_MODULE_IS_STYLER( x ) ( FT_MODULE_CLASS( x )->module_flags & \
FT_MODULE_STYLER )
#define FT_DRIVER_IS_SCALABLE( x ) ( FT_MODULE_CLASS( x )->module_flags & \
FT_MODULE_DRIVER_SCALABLE )
#define FT_DRIVER_USES_OUTLINES( x ) !( FT_MODULE_CLASS( x )->module_flags & \
FT_MODULE_DRIVER_NO_OUTLINES )
#define FT_DRIVER_HAS_HINTER( x ) ( FT_MODULE_CLASS( x )->module_flags & \
FT_MODULE_DRIVER_HAS_HINTER )
#define FT_DRIVER_HINTS_LIGHTLY( x ) ( FT_MODULE_CLASS( x )->module_flags & \
FT_MODULE_DRIVER_HINTS_LIGHTLY )
/**************************************************************************
*
* @function:
* FT_Get_Module_Interface
*
* @description:
* Finds a module and returns its specific interface as a typeless
* pointer.
*
* @input:
* library ::
* A handle to the library object.
*
* module_name ::
* The module's name (as an ASCII string).
*
* @return:
* A module-specific interface if available, 0 otherwise.
*
* @note:
* You should better be familiar with FreeType internals to know which
* module to look for, and what its interface is :-)
*/
FT_BASE( const void* )
FT_Get_Module_Interface( FT_Library library,
const char* mod_name );
FT_BASE( FT_Pointer )
ft_module_get_service( FT_Module module,
const char* service_id,
FT_Bool global );
#ifdef FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES
FT_BASE( FT_Error )
ft_property_string_set( FT_Library library,
const FT_String* module_name,
const FT_String* property_name,
FT_String* value );
#endif
/* */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** F A C E, S I Z E & G L Y P H S L O T O B J E C T S ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* a few macros used to perform easy typecasts with minimal brain damage */
#define FT_FACE( x ) ( (FT_Face)(x) )
#define FT_SIZE( x ) ( (FT_Size)(x) )
#define FT_SLOT( x ) ( (FT_GlyphSlot)(x) )
#define FT_FACE_DRIVER( x ) FT_FACE( x )->driver
#define FT_FACE_LIBRARY( x ) FT_FACE_DRIVER( x )->root.library
#define FT_FACE_MEMORY( x ) FT_FACE( x )->memory
#define FT_FACE_STREAM( x ) FT_FACE( x )->stream
#define FT_SIZE_FACE( x ) FT_SIZE( x )->face
#define FT_SLOT_FACE( x ) FT_SLOT( x )->face
#define FT_FACE_SLOT( x ) FT_FACE( x )->glyph
#define FT_FACE_SIZE( x ) FT_FACE( x )->size
/**************************************************************************
*
* @function:
* FT_New_GlyphSlot
*
* @description:
* It is sometimes useful to have more than one glyph slot for a given
* face object. This function is used to create additional slots. All
* of them are automatically discarded when the face is destroyed.
*
* @input:
* face ::
* A handle to a parent face object.
*
* @output:
* aslot ::
* A handle to a new glyph slot object.
*
* @return:
* FreeType error code. 0 means success.
*/
FT_BASE( FT_Error )
FT_New_GlyphSlot( FT_Face face,
FT_GlyphSlot *aslot );
/**************************************************************************
*
* @function:
* FT_Done_GlyphSlot
*
* @description:
* Destroys a given glyph slot. Remember however that all slots are
* automatically destroyed with its parent. Using this function is not
* always mandatory.
*
* @input:
* slot ::
* A handle to a target glyph slot.
*/
FT_BASE( void )
FT_Done_GlyphSlot( FT_GlyphSlot slot );
/* */
#define FT_REQUEST_WIDTH( req ) \
( (req)->horiResolution \
? ( (req)->width * (FT_Pos)(req)->horiResolution + 36 ) / 72 \
: (req)->width )
#define FT_REQUEST_HEIGHT( req ) \
( (req)->vertResolution \
? ( (req)->height * (FT_Pos)(req)->vertResolution + 36 ) / 72 \
: (req)->height )
/* Set the metrics according to a bitmap strike. */
FT_BASE( void )
FT_Select_Metrics( FT_Face face,
FT_ULong strike_index );
/* Set the metrics according to a size request. */
FT_BASE( void )
FT_Request_Metrics( FT_Face face,
FT_Size_Request req );
/* Match a size request against `available_sizes'. */
FT_BASE( FT_Error )
FT_Match_Size( FT_Face face,
FT_Size_Request req,
FT_Bool ignore_width,
FT_ULong* size_index );
/* Use the horizontal metrics to synthesize the vertical metrics. */
/* If `advance' is zero, it is also synthesized. */
FT_BASE( void )
ft_synthesize_vertical_metrics( FT_Glyph_Metrics* metrics,
FT_Pos advance );
/* Free the bitmap of a given glyphslot when needed (i.e., only when it */
/* was allocated with ft_glyphslot_alloc_bitmap). */
FT_BASE( void )
ft_glyphslot_free_bitmap( FT_GlyphSlot slot );
/* Preset bitmap metrics of an outline glyphslot prior to rendering */
/* and check whether the truncated bbox is too large for rendering. */
FT_BASE( FT_Bool )
ft_glyphslot_preset_bitmap( FT_GlyphSlot slot,
FT_Render_Mode mode,
const FT_Vector* origin );
/* Allocate a new bitmap buffer in a glyph slot. */
FT_BASE( FT_Error )
ft_glyphslot_alloc_bitmap( FT_GlyphSlot slot,
FT_ULong size );
/* Set the bitmap buffer in a glyph slot to a given pointer. The buffer */
/* will not be freed by a later call to ft_glyphslot_free_bitmap. */
FT_BASE( void )
ft_glyphslot_set_bitmap( FT_GlyphSlot slot,
FT_Byte* buffer );
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** R E N D E R E R S ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
#define FT_RENDERER( x ) ( (FT_Renderer)(x) )
#define FT_GLYPH( x ) ( (FT_Glyph)(x) )
#define FT_BITMAP_GLYPH( x ) ( (FT_BitmapGlyph)(x) )
#define FT_OUTLINE_GLYPH( x ) ( (FT_OutlineGlyph)(x) )
typedef struct FT_RendererRec_
{
FT_ModuleRec root;
FT_Renderer_Class* clazz;
FT_Glyph_Format glyph_format;
FT_Glyph_Class glyph_class;
FT_Raster raster;
FT_Raster_Render_Func raster_render;
FT_Renderer_RenderFunc render;
} FT_RendererRec;
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** F O N T D R I V E R S ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* typecast a module into a driver easily */
#define FT_DRIVER( x ) ( (FT_Driver)(x) )
/* typecast a module as a driver, and get its driver class */
#define FT_DRIVER_CLASS( x ) FT_DRIVER( x )->clazz
/**************************************************************************
*
* @struct:
* FT_DriverRec
*
* @description:
* The root font driver class. A font driver is responsible for managing
* and loading font files of a given format.
*
* @fields:
* root ::
* Contains the fields of the root module class.
*
* clazz ::
* A pointer to the font driver's class. Note that this is NOT
* root.clazz. 'class' wasn't used as it is a reserved word in C++.
*
* faces_list ::
* The list of faces currently opened by this driver.
*
* glyph_loader ::
* Unused. Used to be glyph loader for all faces managed by this
* driver.
*/
typedef struct FT_DriverRec_
{
FT_ModuleRec root;
FT_Driver_Class clazz;
FT_ListRec faces_list;
FT_GlyphLoader glyph_loader;
} FT_DriverRec;
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** L I B R A R I E S ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**************************************************************************
*
* @struct:
* FT_LibraryRec
*
* @description:
* The FreeType library class. This is the root of all FreeType data.
* Use FT_New_Library() to create a library object, and FT_Done_Library()
* to discard it and all child objects.
*
* @fields:
* memory ::
* The library's memory object. Manages memory allocation.
*
* version_major ::
* The major version number of the library.
*
* version_minor ::
* The minor version number of the library.
*
* version_patch ::
* The current patch level of the library.
*
* num_modules ::
* The number of modules currently registered within this library.
* This is set to 0 for new libraries. New modules are added through
* the FT_Add_Module() API function.
*
* modules ::
* A table used to store handles to the currently registered
* modules. Note that each font driver contains a list of its opened
* faces.
*
* renderers ::
* The list of renderers currently registered within the library.
*
* cur_renderer ::
* The current outline renderer. This is a shortcut used to avoid
* parsing the list on each call to FT_Outline_Render(). It is a
* handle to the current renderer for the FT_GLYPH_FORMAT_OUTLINE
* format.
*
* auto_hinter ::
* The auto-hinter module interface.
*
* debug_hooks ::
* An array of four function pointers that allow debuggers to hook into
* a font format's interpreter. Currently, only the TrueType bytecode
* debugger uses this.
*
* lcd_weights ::
* The LCD filter weights for ClearType-style subpixel rendering.
*
* lcd_filter_func ::
* The LCD filtering callback function for for ClearType-style subpixel
* rendering.
*
* lcd_geometry ::
* This array specifies LCD subpixel geometry and controls Harmony LCD
* rendering technique, alternative to ClearType.
*
* pic_container ::
* Contains global structs and tables, instead of defining them
* globally.
*
* refcount ::
* A counter initialized to~1 at the time an @FT_Library structure is
* created. @FT_Reference_Library increments this counter, and
* @FT_Done_Library only destroys a library if the counter is~1,
* otherwise it simply decrements it.
*/
typedef struct FT_LibraryRec_
{
FT_Memory memory; /* library's memory manager */
FT_Int version_major;
FT_Int version_minor;
FT_Int version_patch;
FT_UInt num_modules;
FT_Module modules[FT_MAX_MODULES]; /* module objects */
FT_ListRec renderers; /* list of renderers */
FT_Renderer cur_renderer; /* current outline renderer */
FT_Module auto_hinter;
FT_DebugHook_Func debug_hooks[4];
#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
FT_LcdFiveTapFilter lcd_weights; /* filter weights, if any */
FT_Bitmap_LcdFilterFunc lcd_filter_func; /* filtering callback */
#else
FT_Vector lcd_geometry[3]; /* RGB subpixel positions */
#endif
FT_Int refcount;
} FT_LibraryRec;
FT_BASE( FT_Renderer )
FT_Lookup_Renderer( FT_Library library,
FT_Glyph_Format format,
FT_ListNode* node );
FT_BASE( FT_Error )
FT_Render_Glyph_Internal( FT_Library library,
FT_GlyphSlot slot,
FT_Render_Mode render_mode );
typedef const char*
(*FT_Face_GetPostscriptNameFunc)( FT_Face face );
typedef FT_Error
(*FT_Face_GetGlyphNameFunc)( FT_Face face,
FT_UInt glyph_index,
FT_Pointer buffer,
FT_UInt buffer_max );
typedef FT_UInt
(*FT_Face_GetGlyphNameIndexFunc)( FT_Face face,
const FT_String* glyph_name );
#ifndef FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM
/**************************************************************************
*
* @function:
* FT_New_Memory
*
* @description:
* Creates a new memory object.
*
* @return:
* A pointer to the new memory object. 0 in case of error.
*/
FT_BASE( FT_Memory )
FT_New_Memory( void );
/**************************************************************************
*
* @function:
* FT_Done_Memory
*
* @description:
* Discards memory manager.
*
* @input:
* memory ::
* A handle to the memory manager.
*/
FT_BASE( void )
FT_Done_Memory( FT_Memory memory );
#endif /* !FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM */
/* Define default raster's interface. The default raster is located in */
/* `src/base/ftraster.c'. */
/* */
/* Client applications can register new rasters through the */
/* FT_Set_Raster() API. */
#ifndef FT_NO_DEFAULT_RASTER
FT_EXPORT_VAR( FT_Raster_Funcs ) ft_default_raster;
#endif
/**************************************************************************
*
* @macro:
* FT_DEFINE_OUTLINE_FUNCS
*
* @description:
* Used to initialize an instance of FT_Outline_Funcs struct. The struct
* will be allocated in the global scope (or the scope where the macro is
* used).
*/
#define FT_DEFINE_OUTLINE_FUNCS( \
class_, \
move_to_, \
line_to_, \
conic_to_, \
cubic_to_, \
shift_, \
delta_ ) \
static const FT_Outline_Funcs class_ = \
{ \
move_to_, \
line_to_, \
conic_to_, \
cubic_to_, \
shift_, \
delta_ \
};
/**************************************************************************
*
* @macro:
* FT_DEFINE_RASTER_FUNCS
*
* @description:
* Used to initialize an instance of FT_Raster_Funcs struct. The struct
* will be allocated in the global scope (or the scope where the macro is
* used).
*/
#define FT_DEFINE_RASTER_FUNCS( \
class_, \
glyph_format_, \
raster_new_, \
raster_reset_, \
raster_set_mode_, \
raster_render_, \
raster_done_ ) \
const FT_Raster_Funcs class_ = \
{ \
glyph_format_, \
raster_new_, \
raster_reset_, \
raster_set_mode_, \
raster_render_, \
raster_done_ \
};
/**************************************************************************
*
* @macro:
* FT_DEFINE_GLYPH
*
* @description:
* The struct will be allocated in the global scope (or the scope where
* the macro is used).
*/
#define FT_DEFINE_GLYPH( \
class_, \
size_, \
format_, \
init_, \
done_, \
copy_, \
transform_, \
bbox_, \
prepare_ ) \
FT_CALLBACK_TABLE_DEF \
const FT_Glyph_Class class_ = \
{ \
size_, \
format_, \
init_, \
done_, \
copy_, \
transform_, \
bbox_, \
prepare_ \
};
/**************************************************************************
*
* @macro:
* FT_DECLARE_RENDERER
*
* @description:
* Used to create a forward declaration of a FT_Renderer_Class struct
* instance.
*
* @macro:
* FT_DEFINE_RENDERER
*
* @description:
* Used to initialize an instance of FT_Renderer_Class struct.
*
* The struct will be allocated in the global scope (or the scope where
* the macro is used).
*/
#define FT_DECLARE_RENDERER( class_ ) \
FT_EXPORT_VAR( const FT_Renderer_Class ) class_;
#define FT_DEFINE_RENDERER( \
class_, \
flags_, \
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