877 lines
25 KiB
C
877 lines
25 KiB
C
/****************************************************************************
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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 (C) 1996-2020 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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#include FT_INTERNAL_WOFF_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 the
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* 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 ::
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* The input stream.
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*
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* face ::
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* A handle to the target face object.
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*
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* face_index ::
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* The index of the TrueType font, if we are opening a collection, in
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* bits 0-15. The numbered instance index~+~1 of a GX (sub)font, if
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* applicable, in bits 16-30.
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*
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* num_params ::
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* The number of additional parameters.
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*
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* params ::
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* 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 collection'.
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*
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* Once the format tag has been validated by the font driver, it should
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* then call the TT_Load_Face_Func() callback to read the rest of the
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* 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 the
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* common SFNT tables (head, OS/2, maxp, metrics, etc.) in the face
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* object.
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*
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* @input:
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* stream ::
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* The input stream.
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*
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* face ::
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* A handle to the target face object.
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*
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* face_index ::
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* The index of the TrueType font, if we are opening a collection, in
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* bits 0-15. The numbered instance index~+~1 of a GX (sub)font, if
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* applicable, in bits 16-30.
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*
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* num_params ::
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* The number of additional parameters.
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*
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* params ::
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* 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 ::
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* 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 ::
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* The face object to look for.
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*
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* tag ::
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* The tag of table to load. Use the value 0 if you want to access the
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* whole font file, else set this parameter to a valid TrueType table
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* tag that you can forge with the MAKE_TT_TAG macro.
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*
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* offset ::
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* The starting offset in the table (or the file if tag == 0).
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*
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* length ::
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* The address of the decision variable:
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*
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* If `length == NULL`: 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`: Exits immediately; returning the length of the
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* given table or of the font file, depending on the value of 'tag'.
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*
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* If `*length != 0`: 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 ::
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* 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 glyph,
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* at a given strike.
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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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* glyph_index ::
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* The glyph index.
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*
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* strike_index ::
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* The current strike index.
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*
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* @output:
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* arange ::
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* The SBit range containing the glyph index.
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*
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* astrike ::
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* The SBit strike containing the glyph index.
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*
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* aglyph_offset ::
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* 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 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 ::
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* The input stream.
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*
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* range ::
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* The SBit range containing the glyph.
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*
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* @output:
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* big_metrics ::
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* 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 the
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* '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 glyph
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* 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 ::
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* The target face object.
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*
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* req ::
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* The size request.
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*
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* @output:
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* astrike_index ::
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* 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 sbit
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* 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 ::
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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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* @output:
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* metrics ::
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* 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 such
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* 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 ::
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* The glyph index.
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*
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* PSname ::
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* The address of a string pointer. Will be `NULL` in case of error,
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* 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 ::
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* A handle to the target face object.
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*
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* stream ::
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* The input stream.
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*
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* vertical ::
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* 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 ::
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* A handle to the target face object.
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*
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* vertical ::
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* A boolean flag. If set, load vertical metrics.
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*
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* gindex ::
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* The glyph index.
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*
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* @output:
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* abearing ::
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* The horizontal (or vertical) bearing. Set to zero in case of error.
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*
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* aadvance ::
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* The horizontal (or vertical) advance. Set to zero in 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_Set_Palette_Func
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*
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* @description:
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* Load the colors into `face->palette` for a given palette index.
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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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* idx ::
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* The palette index.
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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_Set_Palette_Func)( TT_Face face,
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FT_UInt idx );
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/**************************************************************************
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*
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* @functype:
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* TT_Get_Colr_Layer_Func
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*
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* @description:
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* Iteratively get the color layer data of a given glyph index.
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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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* base_glyph ::
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* The glyph index the colored glyph layers are associated with.
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*
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* @inout:
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* iterator ::
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* An @FT_LayerIterator object. For the first call you should set
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* `iterator->p` to `NULL`. For all following calls, simply use the
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* same object again.
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*
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* @output:
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* aglyph_index ::
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* The glyph index of the current layer.
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*
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* acolor_index ::
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* The color index into the font face's color palette of the current
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* layer. The value 0xFFFF is special; it doesn't reference a palette
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* entry but indicates that the text foreground color should be used
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* instead (to be set up by the application outside of FreeType).
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*
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* @return:
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* Value~1 if everything is OK. If there are no more layers (or if there
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* are no layers at all), value~0 gets returned. In case of an error,
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* value~0 is returned also.
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*/
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typedef FT_Bool
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(*TT_Get_Colr_Layer_Func)( TT_Face face,
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FT_UInt base_glyph,
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FT_UInt *aglyph_index,
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FT_UInt *acolor_index,
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FT_LayerIterator* iterator );
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/**************************************************************************
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*
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* @functype:
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* TT_Blend_Colr_Func
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*
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* @description:
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* Blend the bitmap in `new_glyph` into `base_glyph` using the color
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* specified by `color_index`. If `color_index` is 0xFFFF, use
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* `face->foreground_color` if `face->have_foreground_color` is set.
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* Otherwise check `face->palette_data.palette_flags`: If present and
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* @FT_PALETTE_FOR_DARK_BACKGROUND is set, use BGRA value 0xFFFFFFFF
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* (white opaque). Otherwise use BGRA value 0x000000FF (black opaque).
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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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* color_index ::
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* Color index from the COLR table.
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*
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* base_glyph ::
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* Slot for bitmap to be merged into. The underlying bitmap may get
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* reallocated.
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*
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* new_glyph ::
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* Slot to be incooperated into `base_glyph`.
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*
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* @return:
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* FreeType error code. 0 means success. Returns an error if
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* color_index is invalid or reallocation fails.
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*/
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typedef FT_Error
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(*TT_Blend_Colr_Func)( TT_Face face,
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FT_UInt color_index,
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FT_GlyphSlot base_glyph,
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FT_GlyphSlot new_glyph );
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/**************************************************************************
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*
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* @functype:
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* TT_Get_Name_Func
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*
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* @description:
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* From the 'name' table, return a given ENGLISH name record in ASCII.
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*
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* @input:
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* face ::
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* A handle to the source face object.
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*
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* nameid ::
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* The name id of the name record to return.
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*
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* @inout:
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* name ::
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* The address of an allocated string pointer. `NULL` if no name is
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* present.
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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_Get_Name_Func)( TT_Face face,
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FT_UShort nameid,
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FT_String** name );
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/**************************************************************************
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*
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* @functype:
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* TT_Get_Name_ID_Func
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*
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* @description:
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|
* Search whether an ENGLISH version for a given name ID is in the 'name'
|
|
* table.
|
|
*
|
|
* @input:
|
|
* face ::
|
|
* A handle to the source face object.
|
|
*
|
|
* nameid ::
|
|
* The name id of the name record to return.
|
|
*
|
|
* @output:
|
|
* win ::
|
|
* If non-negative, an index into the 'name' table with the
|
|
* corresponding (3,1) or (3,0) Windows entry.
|
|
*
|
|
* apple ::
|
|
* If non-negative, an index into the 'name' table with the
|
|
* corresponding (1,0) Apple entry.
|
|
*
|
|
* @return:
|
|
* 1 if there is either a win or apple entry (or both), 0 otheriwse.
|
|
*/
|
|
typedef FT_Bool
|
|
(*TT_Get_Name_ID_Func)( TT_Face face,
|
|
FT_UShort nameid,
|
|
FT_Int *win,
|
|
FT_Int *apple );
|
|
|
|
|
|
/**************************************************************************
|
|
*
|
|
* @functype:
|
|
* TT_Load_Table_Func
|
|
*
|
|
* @description:
|
|
* Load a given TrueType table.
|
|
*
|
|
* @input:
|
|
* face ::
|
|
* A handle to the target face object.
|
|
*
|
|
* stream ::
|
|
* The input stream.
|
|
*
|
|
* @return:
|
|
* FreeType error code. 0 means success.
|
|
*
|
|
* @note:
|
|
* The function uses `face->goto_table` to seek the stream to the start
|
|
* of the table, except while loading the font directory.
|
|
*/
|
|
typedef FT_Error
|
|
(*TT_Load_Table_Func)( TT_Face face,
|
|
FT_Stream stream );
|
|
|
|
|
|
/**************************************************************************
|
|
*
|
|
* @functype:
|
|
* TT_Free_Table_Func
|
|
*
|
|
* @description:
|
|
* Free a given TrueType table.
|
|
*
|
|
* @input:
|
|
* face ::
|
|
* A handle to the target face object.
|
|
*/
|
|
typedef void
|
|
(*TT_Free_Table_Func)( TT_Face face );
|
|
|
|
|
|
/*
|
|
* @functype:
|
|
* TT_Face_GetKerningFunc
|
|
*
|
|
* @description:
|
|
* Return the horizontal kerning value between two glyphs.
|
|
*
|
|
* @input:
|
|
* face ::
|
|
* A handle to the source face object.
|
|
*
|
|
* left_glyph ::
|
|
* The left glyph index.
|
|
*
|
|
* right_glyph ::
|
|
* The right glyph index.
|
|
*
|
|
* @return:
|
|
* The kerning value in font units.
|
|
*/
|
|
typedef FT_Int
|
|
(*TT_Face_GetKerningFunc)( TT_Face face,
|
|
FT_UInt left_glyph,
|
|
FT_UInt right_glyph );
|
|
|
|
|
|
/**************************************************************************
|
|
*
|
|
* @struct:
|
|
* SFNT_Interface
|
|
*
|
|
* @description:
|
|
* This structure holds pointers to the functions used to load and free
|
|
* the basic tables that are required in a 'sfnt' font file.
|
|
*
|
|
* @fields:
|
|
* Check the various xxx_Func() descriptions for details.
|
|
*/
|
|
typedef struct SFNT_Interface_
|
|
{
|
|
TT_Loader_GotoTableFunc goto_table;
|
|
|
|
TT_Init_Face_Func init_face;
|
|
TT_Load_Face_Func load_face;
|
|
TT_Done_Face_Func done_face;
|
|
FT_Module_Requester get_interface;
|
|
|
|
TT_Load_Any_Func load_any;
|
|
|
|
/* these functions are called by `load_face' but they can also */
|
|
/* be called from external modules, if there is a need to do so */
|
|
TT_Load_Table_Func load_head;
|
|
TT_Load_Metrics_Func load_hhea;
|
|
TT_Load_Table_Func load_cmap;
|
|
TT_Load_Table_Func load_maxp;
|
|
TT_Load_Table_Func load_os2;
|
|
TT_Load_Table_Func load_post;
|
|
|
|
TT_Load_Table_Func load_name;
|
|
TT_Free_Table_Func free_name;
|
|
|
|
/* this field was called `load_kerning' up to version 2.1.10 */
|
|
TT_Load_Table_Func load_kern;
|
|
|
|
TT_Load_Table_Func load_gasp;
|
|
TT_Load_Table_Func load_pclt;
|
|
|
|
/* see `ttload.h'; this field was called `load_bitmap_header' up to */
|
|
/* version 2.1.10 */
|
|
TT_Load_Table_Func load_bhed;
|
|
|
|
TT_Load_SBit_Image_Func load_sbit_image;
|
|
|
|
/* see `ttpost.h' */
|
|
TT_Get_PS_Name_Func get_psname;
|
|
TT_Free_Table_Func free_psnames;
|
|
|
|
/* starting here, the structure differs from version 2.1.7 */
|
|
|
|
/* this field was introduced in version 2.1.8, named `get_psname' */
|
|
TT_Face_GetKerningFunc get_kerning;
|
|
|
|
/* new elements introduced after version 2.1.10 */
|
|
|
|
/* load the font directory, i.e., the offset table and */
|
|
/* the table directory */
|
|
TT_Load_Table_Func load_font_dir;
|
|
TT_Load_Metrics_Func load_hmtx;
|
|
|
|
TT_Load_Table_Func load_eblc;
|
|
TT_Free_Table_Func free_eblc;
|
|
|
|
TT_Set_SBit_Strike_Func set_sbit_strike;
|
|
TT_Load_Strike_Metrics_Func load_strike_metrics;
|
|
|
|
TT_Load_Table_Func load_cpal;
|
|
TT_Load_Table_Func load_colr;
|
|
TT_Free_Table_Func free_cpal;
|
|
TT_Free_Table_Func free_colr;
|
|
TT_Set_Palette_Func set_palette;
|
|
TT_Get_Colr_Layer_Func get_colr_layer;
|
|
TT_Blend_Colr_Func colr_blend;
|
|
|
|
TT_Get_Metrics_Func get_metrics;
|
|
|
|
TT_Get_Name_Func get_name;
|
|
TT_Get_Name_ID_Func get_name_id;
|
|
|
|
} SFNT_Interface;
|
|
|
|
|
|
/* transitional */
|
|
typedef SFNT_Interface* SFNT_Service;
|
|
|
|
|
|
#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_, \
|
|
load_cpal_, \
|
|
load_colr_, \
|
|
free_cpal_, \
|
|
free_colr_, \
|
|
set_palette_, \
|
|
get_colr_layer_, \
|
|
colr_blend_, \
|
|
get_metrics_, \
|
|
get_name_, \
|
|
get_name_id_ ) \
|
|
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_, \
|
|
load_cpal_, \
|
|
load_colr_, \
|
|
free_cpal_, \
|
|
free_colr_, \
|
|
set_palette_, \
|
|
get_colr_layer_, \
|
|
colr_blend_, \
|
|
get_metrics_, \
|
|
get_name_, \
|
|
get_name_id_ \
|
|
};
|
|
|
|
|
|
FT_END_HEADER
|
|
|
|
#endif /* SFNT_H_ */
|
|
|
|
|
|
/* END */
|