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Added types and structures to support incremental typeface loading.

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This commit is contained in:
Graham Asher 2002-07-18 14:05:19 +00:00
parent fed59b7cc2
commit 0e2fb07685
2 changed files with 149 additions and 0 deletions
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129
include/freetype/freetype.h
View File

@ -199,6 +199,30 @@ FT_BEGIN_HEADER
} FT_Glyph_Metrics;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Basic_Glyph_Metrics */
/* */
/* <Description> */
/* A small glyph metrics structure used to return information */
/* for incrementally defined fonts (see FT_Incremental_Interface). */
/* */
/* <Fields> */
/* bearing_x :: Left side bearing in font units. */
/* */
/* bearing_y :: Top side bearing in font units. */
/* */
/* advance :: Advance in font units. */
/* */
typedef struct FT_Basic_Glyph_Metrics_
{
FT_Long bearing_x;
FT_Long bearing_y;
FT_Long advance;
} FT_Basic_Glyph_Metrics;
/*************************************************************************/
/* */
/* <Struct> */
@ -478,6 +502,111 @@ FT_BEGIN_HEADER
} FT_CharMapRec;
/*************************************************************************/
/* */
/* <Type> */
/* FT_Get_Glyph_Data_Func */
/* */
/* <Description> */
/* A type definition for a function to get glyph data from a */
/* face that supplies glyph data incrementally, after the face */
/* object has been created */
/* */
/* <Input> */
/* object :: a pointer to the user's data, specified by the 'object' */
/* field in FT_Incremental_Interface */
/* */
/* index :: the glyph index */
/* */
/* <Output> */
/* data :: the position and length of the data */
/* */
/* <Return> */
/* a standard error code */
/* */
typedef FT_Error (*FT_Get_Glyph_Data_Func)(void* object,FT_UInt index,FT_Data* data);
/*************************************************************************/
/* */
/* <Type> */
/* FT_Get_Glyph_Metrics_Func */
/* */
/* <Description> */
/* A type definition for a function to get glyph metrics from a */
/* face that supplies glyph metrics incrementally, after the face */
/* object has been created */
/* */
/* <Input> */
/* object :: a pointer to the user's data, specified by the 'object' */
/* field in FT_Incremental_Interface */
/* */
/* index :: the glyph index */
/* */
/* vertical :: true for vertical layout, false for horizontal layout */
/* */
/* <Output> */
/* metrics :: the glyph metrics in font units */
/* */
/* <Return> */
/* a standard error code */
/* */
typedef FT_Error (*FT_Get_Glyph_Metrics_Func)(void* object,FT_UInt index,FT_Bool vertical,
FT_Basic_Glyph_Metrics* metrics,FT_Bool* found);
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Incremental_Interface_Funcs */
/* */
/* <Description> */
/* A table of functions for accessing fonts that load data */
/* incrementally. Used in FT_Incremental_Interface */
/* */
/* <Fields> */
/* get_glyph_data :: The function to get glyph data. Must not be */
/* null. */
/* */
/* get_glyph_metrics :: The function to get glyph metrics. May be */
/* null if the font does not provide */
/* overriding glyph metrics. */
/* */
typedef struct FT_Incremental_Interface_Funcs_
{
FT_Get_Glyph_Data_Func get_glyph_data;
FT_Get_Glyph_Metrics_Func get_glyph_metrics;
} FT_Incremental_Interface_Funcs;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Incremental_Interface */
/* */
/* <Description> */
/* This interface structure is provided to FT_Open_Face to allow */
/* incremental faces to be opened. */
/* */
/* A incremental face supplies no glyph data when it is opened. */
/* Instead the glyph data is supplied using a callback function. */
/* Optionally, metrics that override the metrics in the typeface */
/* data can also be supplied using another callback function. */
/* */
/* <Fields> */
/* funcs :: The table of functions */
/* */
/* object :: The pointer passed to the functions. Usually it */
/* points to the object from which glyph and metric */
/* data is obtained. */
/* */
typedef struct FT_Incremental_Interface_
{
const FT_Incremental_Interface_Funcs* funcs;
void* object;
} FT_Incremental_Interface;
/*************************************************************************/
/*************************************************************************/

20
include/freetype/fttypes.h
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@ -357,6 +357,26 @@ FT_BEGIN_HEADER
} FT_Matrix;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Data */
/* */
/* <Description> */
/* Read-only binary data represented as a pointer and a length. */
/* */
/* <Fields> */
/* pointer :: The data. */
/* */
/* length :: The length of the data in bytes. */
/* */
typedef struct FT_Data_
{
const FT_Byte* pointer;
FT_Int length;
} FT_Data;
/*************************************************************************/
/* */
/* <FuncType> */