forked from minhngoc25a/freetype2
157 lines
5.8 KiB
C
157 lines
5.8 KiB
C
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/***************************************************************************/
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/* */
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/* ftpfr.h */
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/* */
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/* FreeType API for accessing PFR-specific data */
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/* */
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/* Copyright 2002 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 __FTPFR_H__
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#define __FTPFR_H__
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#include <ft2build.h>
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#include FT_FREETYPE_H
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FT_BEGIN_HEADER
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/*************************************************************************/
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/* */
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/* <Section> */
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/* pfr_fonts */
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/* */
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/* <Title> */
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/* PFR Fonts */
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/* */
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/* <Abstract> */
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/* PFR/TrueDoc specific APIs */
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/* */
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/* <Description> */
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/* This section contains the declaration of PFR-specific functions. */
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/* */
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/*************************************************************************/
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/**********************************************************************
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*
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* @function:
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* FT_Get_PFR_Metrics
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*
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* @description:
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* returns the outline and metrics resolutions of a given PFR
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* face.
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*
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* @input:
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* face :: handle to input face. It can be a non-PFR face.
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*
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* @output:
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* aoutline_resolution ::
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* outline resolution. This is equivalent to "face->units_per_EM".
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* optional (parameter can be NULL)
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*
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* ametrics_resolution ::
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* metrics_resolution. This is equivalent to "outline_resolution"
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* for non-PFR fonts. can be NULL
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* optional (parameter can be NULL)
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*
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* ametrics_x_scale ::
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* a 16.16 fixed-point number used to scale distance expressed
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* in metrics units to device sub-pixels. This is equivalent to
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* 'face->size->x_scale', but for metrics only.
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* optional (parameter can be NULL)
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*
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* ametrics_y_scale ::
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* same as 'ametrics_x_scale', but for the vertical direction.
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* optional (parameter can be NULL)
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*
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* @note:
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* if the input face is not a PFR, this function will return an error.
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* However, in all cases, it will return valid values.
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*/
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FT_EXPORT( FT_Error )
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FT_Get_PFR_Metrics( FT_Face face,
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FT_UInt *aoutline_resolution,
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FT_UInt *ametrics_resolution,
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FT_Fixed *ametrics_x_scale,
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FT_Fixed *ametrics_y_scale );
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/**********************************************************************
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*
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* @function:
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* FT_Get_PFR_Kerning
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*
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* @description:
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* returns the kerning pair corresponding to two glyphs in
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* a PFR face. The distance is expressed in metrics units, unlike
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* the result of @FT_Get_Kerning.
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*
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* @input:
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* face :: handle to input face.
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* left :: left glyph index
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* right :: right glyph index
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*
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* @output:
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* avector :: kerning vector
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*
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* @note:
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* this function always return distances in original PFR metrics
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* units. This is unlike @FT_Get_Kerning with the @FT_KERNING_UNSCALED
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* mode, which always return distances converted to outline units.
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*
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* you can use the value of the 'x_scale' and 'y_scale' parameters
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* returned by @FT_Get_PFR_Metrics to scale these to device sub-pixels
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*/
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FT_EXPORT( FT_Error )
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FT_Get_PFR_Kerning( FT_Face face,
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FT_UInt left,
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FT_UInt right,
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FT_Vector *avector );
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/**********************************************************************
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*
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* @function:
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* FT_Get_PFR_Advance
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*
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* @description:
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* returns a given glyph advance, expressed in original metrics units,
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* from a PFR font.
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*
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* @input:
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* face :: handle to input face.
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* gindex :: glyph index
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*
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* @output:
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* aadvance :: glyph advance in metrics units
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*
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* @return:
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* error code. 0 means success
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*
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* @note:
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* you can use the 'x_scale' or 'y_scale' results of @FT_Get_PFR_Metrics
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* to convert the advance to device sub-pixels (i.e. 1/64th of pixels)
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*/
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FT_EXPORT( FT_Error )
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FT_Get_PFR_Advance( FT_Face face,
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FT_UInt gindex,
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FT_Pos *aadvance );
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/* */
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FT_END_HEADER
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#endif /* __FTBDF_H__ */
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/* END */
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