712 lines
40 KiB
C
Vendored
712 lines
40 KiB
C
Vendored
/***************************************************************************/
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/* */
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/* sfnt.h */
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/* */
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/* High-level `sfnt' driver interface (specification). */
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/* */
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/* Copyright 1996-2006, 2009, 2012-2014 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#ifndef __SFNT_H__
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#define __SFNT_H__
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#include <ft2build.h>
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#include FT_INTERNAL_DRIVER_H
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#include FT_INTERNAL_TRUETYPE_TYPES_H
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FT_BEGIN_HEADER
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* TT_Init_Face_Func */
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/* */
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/* <Description> */
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/* First part of the SFNT face object initialization. This finds */
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/* the face in a SFNT file or collection, and load its format tag in */
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/* face->format_tag. */
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/* */
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/* <Input> */
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/* stream :: The input stream. */
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/* */
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/* face :: A handle to the target face object. */
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/* */
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/* face_index :: The index of the TrueType font, if we are opening a */
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/* collection. */
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/* */
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/* num_params :: The number of additional parameters. */
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/* */
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/* params :: Optional additional parameters. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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/* <Note> */
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/* The stream cursor must be at the font file's origin. */
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/* */
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/* This function recognizes fonts embedded in a `TrueType */
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/* collection'. */
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/* */
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/* Once the format tag has been validated by the font driver, it */
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/* should then call the TT_Load_Face_Func() callback to read the rest */
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/* of the SFNT tables in the object. */
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/* */
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typedef FT_Error
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(*TT_Init_Face_Func)( FT_Stream stream,
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TT_Face face,
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FT_Int face_index,
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FT_Int num_params,
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FT_Parameter* params );
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* TT_Load_Face_Func */
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/* */
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/* <Description> */
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/* Second part of the SFNT face object initialization. This loads */
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/* the common SFNT tables (head, OS/2, maxp, metrics, etc.) in the */
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/* face object. */
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/* */
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/* <Input> */
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/* stream :: The input stream. */
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/* */
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/* face :: A handle to the target face object. */
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/* */
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/* face_index :: The index of the TrueType font, if we are opening a */
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/* collection. */
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/* */
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/* num_params :: The number of additional parameters. */
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/* */
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/* params :: Optional additional parameters. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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/* <Note> */
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/* This function must be called after TT_Init_Face_Func(). */
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/* */
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typedef FT_Error
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(*TT_Load_Face_Func)( FT_Stream stream,
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TT_Face face,
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FT_Int face_index,
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FT_Int num_params,
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FT_Parameter* params );
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* TT_Done_Face_Func */
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/* */
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/* <Description> */
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/* A callback used to delete the common SFNT data from a face. */
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/* */
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/* <Input> */
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/* face :: A handle to the target face object. */
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/* */
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/* <Note> */
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/* This function does NOT destroy the face object. */
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/* */
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typedef void
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(*TT_Done_Face_Func)( TT_Face face );
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* TT_Load_Any_Func */
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/* */
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/* <Description> */
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/* Load any font table into client memory. */
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/* */
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/* <Input> */
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/* face :: The face object to look for. */
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/* */
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/* tag :: The tag of table to load. Use the value 0 if you want */
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/* to access the whole font file, else set this parameter */
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/* to a valid TrueType table tag that you can forge with */
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/* the MAKE_TT_TAG macro. */
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/* */
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/* offset :: The starting offset in the table (or the file if */
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/* tag == 0). */
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/* */
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/* length :: The address of the decision variable: */
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/* */
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/* If length == NULL: */
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/* Loads the whole table. Returns an error if */
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/* `offset' == 0! */
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/* */
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/* If *length == 0: */
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/* Exits immediately; returning the length of the given */
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/* table or of the font file, depending on the value of */
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/* `tag'. */
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/* */
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/* If *length != 0: */
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/* Loads the next `length' bytes of table or font, */
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/* starting at offset `offset' (in table or font too). */
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/* */
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/* <Output> */
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/* buffer :: The address of target buffer. */
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/* */
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/* <Return> */
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/* TrueType error code. 0 means success. */
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/* */
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typedef FT_Error
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(*TT_Load_Any_Func)( TT_Face face,
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FT_ULong tag,
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FT_Long offset,
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FT_Byte *buffer,
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FT_ULong* length );
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* TT_Find_SBit_Image_Func */
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/* */
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/* <Description> */
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/* Check whether an embedded bitmap (an `sbit') exists for a given */
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/* glyph, at a given strike. */
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/* */
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/* <Input> */
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/* face :: The target face object. */
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/* */
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/* glyph_index :: The glyph index. */
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/* */
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/* strike_index :: The current strike index. */
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/* */
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/* <Output> */
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/* arange :: The SBit range containing the glyph index. */
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/* */
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/* astrike :: The SBit strike containing the glyph index. */
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/* */
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/* aglyph_offset :: The offset of the glyph data in `EBDT' table. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. Returns */
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/* SFNT_Err_Invalid_Argument if no sbit exists for the requested */
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/* glyph. */
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/* */
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typedef FT_Error
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(*TT_Find_SBit_Image_Func)( TT_Face face,
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FT_UInt glyph_index,
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FT_ULong strike_index,
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TT_SBit_Range *arange,
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TT_SBit_Strike *astrike,
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FT_ULong *aglyph_offset );
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* TT_Load_SBit_Metrics_Func */
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/* */
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/* <Description> */
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/* Get the big metrics for a given embedded bitmap. */
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/* */
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/* <Input> */
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/* stream :: The input stream. */
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/* */
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/* range :: The SBit range containing the glyph. */
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/* */
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/* <Output> */
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/* big_metrics :: A big SBit metrics structure for the glyph. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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/* <Note> */
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/* The stream cursor must be positioned at the glyph's offset within */
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/* the `EBDT' table before the call. */
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/* */
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/* If the image format uses variable metrics, the stream cursor is */
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/* positioned just after the metrics header in the `EBDT' table on */
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/* function exit. */
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/* */
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typedef FT_Error
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(*TT_Load_SBit_Metrics_Func)( FT_Stream stream,
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TT_SBit_Range range,
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TT_SBit_Metrics metrics );
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* TT_Load_SBit_Image_Func */
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/* */
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/* <Description> */
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/* Load a given glyph sbit image from the font resource. This also */
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/* returns its metrics. */
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/* */
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/* <Input> */
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/* face :: */
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/* The target face object. */
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/* */
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/* strike_index :: */
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/* The strike index. */
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/* */
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/* glyph_index :: */
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/* The current glyph index. */
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/* */
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/* load_flags :: */
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/* The current load flags. */
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/* */
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/* stream :: */
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/* The input stream. */
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/* */
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/* <Output> */
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/* amap :: */
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/* The target pixmap. */
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/* */
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/* ametrics :: */
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/* A big sbit metrics structure for the glyph image. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. Returns an error if no */
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/* glyph sbit exists for the index. */
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/* */
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/* <Note> */
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/* The `map.buffer' field is always freed before the glyph is loaded. */
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/* */
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typedef FT_Error
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(*TT_Load_SBit_Image_Func)( TT_Face face,
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FT_ULong strike_index,
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FT_UInt glyph_index,
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FT_UInt load_flags,
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FT_Stream stream,
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FT_Bitmap *amap,
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TT_SBit_MetricsRec *ametrics );
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* TT_Set_SBit_Strike_Func */
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/* */
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/* <Description> */
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/* Select an sbit strike for a given size request. */
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/* */
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/* <Input> */
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/* face :: The target face object. */
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/* */
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/* req :: The size request. */
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/* */
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/* <Output> */
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/* astrike_index :: The index of the sbit strike. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. Returns an error if no */
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/* sbit strike exists for the selected ppem values. */
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/* */
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typedef FT_Error
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(*TT_Set_SBit_Strike_Func)( TT_Face face,
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FT_Size_Request req,
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FT_ULong* astrike_index );
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* TT_Load_Strike_Metrics_Func */
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/* */
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/* <Description> */
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/* Load the metrics of a given strike. */
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/* */
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/* <Input> */
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/* face :: The target face object. */
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/* */
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/* strike_index :: The strike index. */
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/* */
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/* <Output> */
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/* metrics :: the metrics of the strike. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. Returns an error if no */
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/* such sbit strike exists. */
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/* */
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typedef FT_Error
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(*TT_Load_Strike_Metrics_Func)( TT_Face face,
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FT_ULong strike_index,
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FT_Size_Metrics* metrics );
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* TT_Get_PS_Name_Func */
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/* */
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/* <Description> */
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/* Get the PostScript glyph name of a glyph. */
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/* */
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/* <Input> */
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/* idx :: The glyph index. */
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/* */
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/* PSname :: The address of a string pointer. Will be NULL in case */
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/* of error, otherwise it is a pointer to the glyph name. */
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/* */
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/* You must not modify the returned string! */
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/* */
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/* <Output> */
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/* FreeType error code. 0 means success. */
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/* */
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typedef FT_Error
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(*TT_Get_PS_Name_Func)( TT_Face face,
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FT_UInt idx,
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FT_String** PSname );
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* TT_Load_Metrics_Func */
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/* */
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/* <Description> */
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/* Load a metrics table, which is a table with a horizontal and a */
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/* vertical version. */
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/* */
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/* <Input> */
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/* face :: A handle to the target face object. */
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/* */
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/* stream :: The input stream. */
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/* */
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/* vertical :: A boolean flag. If set, load the vertical one. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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typedef FT_Error
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(*TT_Load_Metrics_Func)( TT_Face face,
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FT_Stream stream,
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FT_Bool vertical );
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* TT_Get_Metrics_Func */
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/* */
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/* <Description> */
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/* Load the horizontal or vertical header in a face object. */
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/* */
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/* <Input> */
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/* face :: A handle to the target face object. */
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/* */
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/* vertical :: A boolean flag. If set, load vertical metrics. */
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/* */
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/* gindex :: The glyph index. */
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/* */
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/* <Output> */
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/* abearing :: The horizontal (or vertical) bearing. Set to zero in */
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/* case of error. */
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/* */
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/* aadvance :: The horizontal (or vertical) advance. Set to zero in */
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/* case of error. */
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/* */
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typedef void
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(*TT_Get_Metrics_Func)( TT_Face face,
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FT_Bool vertical,
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FT_UInt gindex,
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FT_Short* abearing,
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FT_UShort* aadvance );
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* TT_Load_Table_Func */
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/* */
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/* <Description> */
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/* Load a given TrueType table. */
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/* */
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/* <Input> */
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/* face :: A handle to the target face object. */
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/* */
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/* stream :: The input stream. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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/* <Note> */
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/* The function uses `face->goto_table' to seek the stream to the */
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/* start of the table, except while loading the font directory. */
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/* */
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typedef FT_Error
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(*TT_Load_Table_Func)( TT_Face face,
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FT_Stream stream );
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* TT_Free_Table_Func */
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/* */
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/* <Description> */
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/* Free a given TrueType table. */
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/* */
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/* <Input> */
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/* face :: A handle to the target face object. */
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/* */
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typedef void
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(*TT_Free_Table_Func)( TT_Face face );
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/*
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* @functype:
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* TT_Face_GetKerningFunc
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*
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* @description:
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* Return the horizontal kerning value between two glyphs.
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*
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* @input:
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* face :: A handle to the source face object.
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* left_glyph :: The left glyph index.
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* right_glyph :: The right glyph index.
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*
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* @return:
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* The kerning value in font units.
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*/
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typedef FT_Int
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(*TT_Face_GetKerningFunc)( TT_Face face,
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FT_UInt left_glyph,
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FT_UInt right_glyph );
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* SFNT_Interface */
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/* */
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/* <Description> */
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/* This structure holds pointers to the functions used to load and */
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/* free the basic tables that are required in a `sfnt' font file. */
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/* */
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/* <Fields> */
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/* Check the various xxx_Func() descriptions for details. */
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/* */
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typedef struct SFNT_Interface_
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{
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TT_Loader_GotoTableFunc goto_table;
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TT_Init_Face_Func init_face;
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TT_Load_Face_Func load_face;
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TT_Done_Face_Func done_face;
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FT_Module_Requester get_interface;
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TT_Load_Any_Func load_any;
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/* these functions are called by `load_face' but they can also */
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/* be called from external modules, if there is a need to do so */
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TT_Load_Table_Func load_head;
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TT_Load_Metrics_Func load_hhea;
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TT_Load_Table_Func load_cmap;
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TT_Load_Table_Func load_maxp;
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TT_Load_Table_Func load_os2;
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TT_Load_Table_Func load_post;
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TT_Load_Table_Func load_name;
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TT_Free_Table_Func free_name;
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/* this field was called `load_kerning' up to version 2.1.10 */
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TT_Load_Table_Func load_kern;
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TT_Load_Table_Func load_gasp;
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TT_Load_Table_Func load_pclt;
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/* see `ttload.h'; this field was called `load_bitmap_header' up to */
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/* version 2.1.10 */
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TT_Load_Table_Func load_bhed;
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TT_Load_SBit_Image_Func load_sbit_image;
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/* see `ttpost.h' */
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TT_Get_PS_Name_Func get_psname;
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TT_Free_Table_Func free_psnames;
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/* starting here, the structure differs from version 2.1.7 */
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/* this field was introduced in version 2.1.8, named `get_psname' */
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TT_Face_GetKerningFunc get_kerning;
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/* new elements introduced after version 2.1.10 */
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/* load the font directory, i.e., the offset table and */
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/* the table directory */
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TT_Load_Table_Func load_font_dir;
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TT_Load_Metrics_Func load_hmtx;
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TT_Load_Table_Func load_eblc;
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TT_Free_Table_Func free_eblc;
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TT_Set_SBit_Strike_Func set_sbit_strike;
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TT_Load_Strike_Metrics_Func load_strike_metrics;
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TT_Get_Metrics_Func get_metrics;
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} SFNT_Interface;
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/* transitional */
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typedef SFNT_Interface* SFNT_Service;
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#ifndef FT_CONFIG_OPTION_PIC
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#define FT_DEFINE_SFNT_INTERFACE( \
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class_, \
|
|
goto_table_, \
|
|
init_face_, \
|
|
load_face_, \
|
|
done_face_, \
|
|
get_interface_, \
|
|
load_any_, \
|
|
load_head_, \
|
|
load_hhea_, \
|
|
load_cmap_, \
|
|
load_maxp_, \
|
|
load_os2_, \
|
|
load_post_, \
|
|
load_name_, \
|
|
free_name_, \
|
|
load_kern_, \
|
|
load_gasp_, \
|
|
load_pclt_, \
|
|
load_bhed_, \
|
|
load_sbit_image_, \
|
|
get_psname_, \
|
|
free_psnames_, \
|
|
get_kerning_, \
|
|
load_font_dir_, \
|
|
load_hmtx_, \
|
|
load_eblc_, \
|
|
free_eblc_, \
|
|
set_sbit_strike_, \
|
|
load_strike_metrics_, \
|
|
get_metrics_ ) \
|
|
static const SFNT_Interface class_ = \
|
|
{ \
|
|
goto_table_, \
|
|
init_face_, \
|
|
load_face_, \
|
|
done_face_, \
|
|
get_interface_, \
|
|
load_any_, \
|
|
load_head_, \
|
|
load_hhea_, \
|
|
load_cmap_, \
|
|
load_maxp_, \
|
|
load_os2_, \
|
|
load_post_, \
|
|
load_name_, \
|
|
free_name_, \
|
|
load_kern_, \
|
|
load_gasp_, \
|
|
load_pclt_, \
|
|
load_bhed_, \
|
|
load_sbit_image_, \
|
|
get_psname_, \
|
|
free_psnames_, \
|
|
get_kerning_, \
|
|
load_font_dir_, \
|
|
load_hmtx_, \
|
|
load_eblc_, \
|
|
free_eblc_, \
|
|
set_sbit_strike_, \
|
|
load_strike_metrics_, \
|
|
get_metrics_, \
|
|
};
|
|
|
|
#else /* FT_CONFIG_OPTION_PIC */
|
|
|
|
#define FT_INTERNAL( a, a_ ) \
|
|
clazz->a = a_;
|
|
|
|
#define FT_DEFINE_SFNT_INTERFACE( \
|
|
class_, \
|
|
goto_table_, \
|
|
init_face_, \
|
|
load_face_, \
|
|
done_face_, \
|
|
get_interface_, \
|
|
load_any_, \
|
|
load_head_, \
|
|
load_hhea_, \
|
|
load_cmap_, \
|
|
load_maxp_, \
|
|
load_os2_, \
|
|
load_post_, \
|
|
load_name_, \
|
|
free_name_, \
|
|
load_kern_, \
|
|
load_gasp_, \
|
|
load_pclt_, \
|
|
load_bhed_, \
|
|
load_sbit_image_, \
|
|
get_psname_, \
|
|
free_psnames_, \
|
|
get_kerning_, \
|
|
load_font_dir_, \
|
|
load_hmtx_, \
|
|
load_eblc_, \
|
|
free_eblc_, \
|
|
set_sbit_strike_, \
|
|
load_strike_metrics_, \
|
|
get_metrics_ ) \
|
|
void \
|
|
FT_Init_Class_ ## class_( FT_Library library, \
|
|
SFNT_Interface* clazz ) \
|
|
{ \
|
|
FT_UNUSED( library ); \
|
|
\
|
|
clazz->goto_table = goto_table_; \
|
|
clazz->init_face = init_face_; \
|
|
clazz->load_face = load_face_; \
|
|
clazz->done_face = done_face_; \
|
|
clazz->get_interface = get_interface_; \
|
|
clazz->load_any = load_any_; \
|
|
clazz->load_head = load_head_; \
|
|
clazz->load_hhea = load_hhea_; \
|
|
clazz->load_cmap = load_cmap_; \
|
|
clazz->load_maxp = load_maxp_; \
|
|
clazz->load_os2 = load_os2_; \
|
|
clazz->load_post = load_post_; \
|
|
clazz->load_name = load_name_; \
|
|
clazz->free_name = free_name_; \
|
|
clazz->load_kern = load_kern_; \
|
|
clazz->load_gasp = load_gasp_; \
|
|
clazz->load_pclt = load_pclt_; \
|
|
clazz->load_bhed = load_bhed_; \
|
|
clazz->load_sbit_image = load_sbit_image_; \
|
|
clazz->get_psname = get_psname_; \
|
|
clazz->free_psnames = free_psnames_; \
|
|
clazz->get_kerning = get_kerning_; \
|
|
clazz->load_font_dir = load_font_dir_; \
|
|
clazz->load_hmtx = load_hmtx_; \
|
|
clazz->load_eblc = load_eblc_; \
|
|
clazz->free_eblc = free_eblc_; \
|
|
clazz->set_sbit_strike = set_sbit_strike_; \
|
|
clazz->load_strike_metrics = load_strike_metrics_; \
|
|
clazz->get_metrics = get_metrics_; \
|
|
}
|
|
|
|
#endif /* FT_CONFIG_OPTION_PIC */
|
|
|
|
FT_END_HEADER
|
|
|
|
#endif /* __SFNT_H__ */
|
|
|
|
|
|
/* END */
|