138 lines
4.0 KiB
C
138 lines
4.0 KiB
C
/***************************************************************************/
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/* */
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/* ahoptim.h */
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/* */
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/* FreeType auto hinting outline optimization (declaration). */
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/* */
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/* Copyright 2000-2001 Catharon Productions Inc. */
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/* Author: David Turner */
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/* */
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/* This file is part of the Catharon Typography Project and shall only */
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/* be used, modified, and distributed under the terms of the Catharon */
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/* Open Source License that should come with this file under the name */
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/* `CatharonLicense.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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/* Note that this license is compatible with the FreeType license. */
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/* */
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/***************************************************************************/
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#ifndef __AHOPTIM_H__
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#define __AHOPTIM_H__
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#include <ft2build.h>
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#include "ahtypes.h"
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FT_BEGIN_HEADER
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/* the maximal number of stem configurations to record */
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/* during optimization */
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#define AH_MAX_CONFIGS 8
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typedef struct AH_Stem_
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{
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FT_Pos pos; /* current position */
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FT_Pos velocity; /* current velocity */
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FT_Pos force; /* sum of current forces */
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FT_Pos width; /* normalized width */
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FT_Pos min_pos; /* minimum grid position */
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FT_Pos max_pos; /* maximum grid position */
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AH_Edge* edge1; /* left/bottom edge */
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AH_Edge* edge2; /* right/top edge */
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FT_Pos opos; /* original position */
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FT_Pos owidth; /* original width */
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FT_Pos min_coord; /* minimum coordinate */
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FT_Pos max_coord; /* maximum coordinate */
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} AH_Stem;
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/* A spring between two stems */
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typedef struct AH_Spring_
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{
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AH_Stem* stem1;
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AH_Stem* stem2;
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FT_Pos owidth; /* original width */
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FT_Pos tension; /* current tension */
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} AH_Spring;
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/* A configuration records the position of each stem at a given time */
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/* as well as the associated distortion */
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typedef struct AH_Configuration_
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{
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FT_Pos* positions;
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FT_Long distortion;
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} AH_Configuration;
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typedef struct AH_Optimizer_
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{
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FT_Memory memory;
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AH_Outline* outline;
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FT_Int num_hstems;
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AH_Stem* horz_stems;
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FT_Int num_vstems;
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AH_Stem* vert_stems;
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FT_Int num_hsprings;
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FT_Int num_vsprings;
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AH_Spring* horz_springs;
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AH_Spring* vert_springs;
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FT_Int num_configs;
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AH_Configuration configs[AH_MAX_CONFIGS];
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FT_Pos* positions;
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/* during each pass, use these instead */
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FT_Int num_stems;
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AH_Stem* stems;
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FT_Int num_springs;
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AH_Spring* springs;
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FT_Bool vertical;
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FT_Fixed tension_scale;
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FT_Pos tension_threshold;
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} AH_Optimizer;
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/* loads the outline into the optimizer */
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int
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AH_Optimizer_Init( AH_Optimizer* optimizer,
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AH_Outline* outline,
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FT_Memory memory );
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/* compute optimal outline */
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void
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AH_Optimizer_Compute( AH_Optimizer* optimizer );
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/* release the optimization data */
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void
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AH_Optimizer_Done( AH_Optimizer* optimizer );
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FT_END_HEADER
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#endif /* __AHOPTIM_H__ */
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/* END */
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