0d5f1dd37c
The old code used to divide the darkening amount by em_ratio twice, leading to unnecessarily bold stems on certain fonts with higher units per em (e.g. Inter). This patch fixes it. The return value of af_loader_compute_darkening was also changed to use 16.16 fixed point to get rid of a redundant truncation operation. This should slightly improve the precision, although it's still bottlenecked by the emboldening function, which uses 26.6 fixed point. * src/autofit/afloader.[ch] (af_loader_compute_darkening): Return FT_Fixed. (af_loader_embolden_glyph_in_slot): Revise calculations.
92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
/****************************************************************************
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*
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* afloader.h
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*
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* Auto-fitter glyph loading routines (specification).
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*
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* Copyright (C) 2003-2020 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 AFLOADER_H_
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#define AFLOADER_H_
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#include "afhints.h"
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#include "afmodule.h"
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#include "afglobal.h"
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FT_BEGIN_HEADER
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/*
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* The autofitter module's (global) data structure to communicate with
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* actual fonts. If necessary, `local' data like the current face, the
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* current face's auto-hint data, or the current glyph's parameters
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* relevant to auto-hinting are `swapped in'. Cf. functions like
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* `af_loader_reset' and `af_loader_load_g'.
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*/
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typedef struct AF_LoaderRec_
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{
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/* current face data */
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FT_Face face;
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AF_FaceGlobals globals;
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/* current glyph data */
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AF_GlyphHints hints;
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AF_StyleMetrics metrics;
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FT_Bool transformed;
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FT_Matrix trans_matrix;
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FT_Vector trans_delta;
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FT_Vector pp1;
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FT_Vector pp2;
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/* we don't handle vertical phantom points */
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} AF_LoaderRec, *AF_Loader;
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FT_LOCAL( void )
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af_loader_init( AF_Loader loader,
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AF_GlyphHints hints );
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FT_LOCAL( FT_Error )
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af_loader_reset( AF_Loader loader,
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AF_Module module,
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FT_Face face );
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FT_LOCAL( void )
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af_loader_done( AF_Loader loader );
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FT_LOCAL( FT_Error )
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af_loader_load_glyph( AF_Loader loader,
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AF_Module module,
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FT_Face face,
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FT_UInt gindex,
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FT_Int32 load_flags );
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FT_LOCAL_DEF( FT_Fixed )
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af_loader_compute_darkening( AF_Loader loader,
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FT_Face face,
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FT_Pos standard_width );
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/* */
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FT_END_HEADER
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#endif /* AFLOADER_H_ */
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/* END */
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