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@ -1,24 +1,20 @@ |
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/*******************************************************************
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* |
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* t1hinter.h 1.2 |
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* |
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* Type1 hinter. |
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* |
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* Copyright 1996-1999 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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* The Hinter is in charge of fitting th scaled outline to the |
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* pixel grid in order to considerably improve the quality of |
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* the Type 1 font driver's output.. |
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* |
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******************************************************************/ |
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/***************************************************************************/ |
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/* */ |
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/* t1hinter.h */ |
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/* */ |
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/* Type 1 hinter (body). */ |
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/* */ |
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/* Copyright 1996-2000 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 T1HINTER_H |
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#define T1HINTER_H |
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@ -31,29 +27,30 @@ |
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#endif |
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/************************************************************************
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* |
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* <Struct> |
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* T1_Snap_Zone |
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* |
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* <Description> |
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* A "snap zone" is used to model either a blue zone or a stem width |
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* at a given character size. It is made of a minimum and maximum |
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* edge, defined in 26.6 pixels, as well as one "original" and |
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* "scaled" position. |
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* |
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* the position corresponds to the stem width (for stem snap zones) |
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* or to the blue position (for blue zones) |
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* |
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* <Fields> |
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* orus :: original position in font units |
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* pix :: current position in sub-pixel units |
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* min :: minimum boundary in sub-pixel units |
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* max :: maximim boundary in sub-pixel units |
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* |
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************************************************************************/ |
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typedef struct T1_Snap_Zone_ |
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/*************************************************************************/ |
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/* */ |
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/* <Struct> */ |
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/* T1_Snap_Zone */ |
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/* */ |
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/* <Description> */ |
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/* A `snap zone' is used to model either a blue zone or a stem width */ |
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/* at a given character size. It is made of a minimum and maximum */ |
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/* edge, defined in 26.6 pixels, as well as an `original' and */ |
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/* `scaled' position. */ |
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/* */ |
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/* The position corresponds to the stem width (for stem snap zones) */ |
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/* or to the blue position (for blue zones). */ |
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/* */ |
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/* <Fields> */ |
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/* orus :: The original position in font units. */ |
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/* */ |
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/* pix :: The current position in sub-pixel units. */ |
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/* */ |
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/* min :: The minimum boundary in sub-pixel units. */ |
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/* */ |
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/* max :: The maximum boundary in sub-pixel units. */ |
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/* */ |
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typedef struct T1_Snap_Zone_ |
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{ |
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FT_Pos orus; |
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FT_Pos pix; |
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@ -63,21 +60,20 @@ |
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} T1_Snap_Zone; |
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/************************************************************************
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* |
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* <Struct> |
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* T1_Edge |
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* |
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* <Description> |
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* A very simply structure used to model an stem edge |
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* |
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* <Fields> |
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* orus :: original edge position in font units |
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* pix :: scaled edge position in sub-pixel units |
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* |
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************************************************************************/ |
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typedef struct T1_Edge_ |
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/*************************************************************************/ |
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/* */ |
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/* <Struct> */ |
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/* T1_Edge */ |
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/* */ |
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/* <Description> */ |
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/* A very simple structure used to model a stem edge. */ |
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/* */ |
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/* <Fields> */ |
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/* orus :: The original edge position in font units. */ |
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/* */ |
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/* pix :: The scaled edge position in sub-pixel units. */ |
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/* */ |
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typedef struct T1_Edge_ |
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{ |
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FT_Pos orus; |
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FT_Pos pix; |
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@ -85,26 +81,26 @@ |
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} T1_Edge; |
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/************************************************************************
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* |
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* <Struct> |
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* T1_Stem_Hint |
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* |
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* <Description> |
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* A simple structure used to model a stem hint |
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* |
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* <Fields> |
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* min_edge :: the hint's minimum edge |
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* max_edge :: the hint's maximum edge |
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* hint_flags :: some flags describing the stem properties |
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* |
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* <Note> |
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* the min and max edges of a ghost stem have the same position, |
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* even if they're coded in a weird way in the charstrings |
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* |
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************************************************************************/ |
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typedef struct T1_Stem_Hint_ |
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/*************************************************************************/ |
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/* */ |
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/* <Struct> */ |
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/* T1_Stem_Hint */ |
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/* */ |
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/* <Description> */ |
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/* A simple structure used to model a stem hint. */ |
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/* */ |
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/* <Fields> */ |
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/* min_edge :: The hint's minimum edge. */ |
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/* */ |
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/* max_edge :: The hint's maximum edge. */ |
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/* */ |
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/* hint_flags :: Some flags describing the stem properties. */ |
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/* */ |
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/* <Note> */ |
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/* The min and max edges of a ghost stem have the same position, */ |
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/* even if they are coded in a weird way in the charstrings. */ |
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/* */ |
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typedef struct T1_Stem_Hint_ |
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{ |
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T1_Edge min_edge; |
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T1_Edge max_edge; |
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@ -114,109 +110,105 @@ |
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#define T1_HINT_FLAG_ACTIVE 1 /* indicates an active stem */ |
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#define T1_HINT_FLAG_MIN_BORDER 2 /* unused for now.. */ |
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#define T1_HINT_FLAG_MAX_BORDER 4 /* unused for now.. */ |
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/* hinter's configuration constants */ |
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#define T1_HINTER_MAX_BLUES 24 /* maximum number of blue zones */ |
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#define T1_HINTER_MAX_SNAPS 16 /* maximum number of stem snap zones */ |
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#define T1_HINTER_MAX_EDGES 64 /* maximum number of stem hints */ |
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/************************************************************************
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* |
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* <Struct> |
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* T1_Size_Hints |
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* |
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* <Description> |
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* A structure used to model the hinting information related to |
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* a size object |
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* |
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* <Fields> |
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* supress_overshoots :: a boolean flag to tell when overshoot |
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* supression should occur. |
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* |
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* num_blue_zones :: the total number of blue zones (top+bottom) |
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* num_bottom_zones :: the number of bottom zones |
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* |
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* blue_zones :: the blue zones table. bottom zones are |
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* stored first in the table, followed by |
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* all top zones |
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* |
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* num_stem_snapH :: number of horizontal stem snap zones |
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* stem_snapH :: horizontal stem snap zones |
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* |
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* num_stem_snapV :: number of vertical stem snap zones |
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* stem_snapV :: vertical stem snap zones |
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* |
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************************************************************************/ |
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struct T1_Size_Hints_ |
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#define T1_HINT_FLAG_MIN_BORDER 2 /* unused for now */ |
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#define T1_HINT_FLAG_MAX_BORDER 4 /* unused for now */ |
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/* hinter's configuration constants */ |
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#define T1_HINTER_MAX_BLUES 24 /* maximum number of blue zones */ |
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#define T1_HINTER_MAX_SNAPS 16 /* maximum number of stem snap zones */ |
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#define T1_HINTER_MAX_EDGES 64 /* maximum number of stem hints */ |
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/*************************************************************************/ |
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/* */ |
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/* <Struct> */ |
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/* T1_Size_Hints */ |
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/* */ |
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/* <Description> */ |
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/* A structure used to model the hinting information related to a size */ |
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/* object. */ |
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/* */ |
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/* <Fields> */ |
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/* supress_overshoots :: A boolean flag to tell whether overshoot */ |
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/* supression should occur. */ |
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/* */ |
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/* num_blue_zones :: The total number of blue zones (top+bottom). */ |
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/* */ |
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/* num_bottom_zones :: The number of bottom zones. */ |
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/* */ |
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/* blue_zones :: The blue zones table. Bottom zones are */ |
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/* stored first in the table, followed by all */ |
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/* top zones. */ |
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/* */ |
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/* num_snap_widths :: The number of horizontal stem snap zones. */ |
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/* */ |
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/* snap_widths :: An array of horizontal stem snap zones. */ |
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/* */ |
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/* num_snap_heights :: The number of vertical stem snap zones. */ |
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/* */ |
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/* snap_heights :: An array of vertical stem snap zones. */ |
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/* */ |
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struct T1_Size_Hints_ |
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{ |
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FT_Bool supress_overshoots; |
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FT_Int num_blue_zones; |
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FT_Int num_bottom_zones; |
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T1_Snap_Zone blue_zones[ T1_HINTER_MAX_BLUES ]; |
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T1_Snap_Zone blue_zones[T1_HINTER_MAX_BLUES]; |
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FT_Int num_snap_widths; |
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T1_Snap_Zone snap_widths[ T1_HINTER_MAX_SNAPS ]; |
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T1_Snap_Zone snap_widths[T1_HINTER_MAX_SNAPS]; |
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FT_Int num_snap_heights; |
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T1_Snap_Zone snap_heights[ T1_HINTER_MAX_SNAPS ]; |
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T1_Snap_Zone snap_heights[T1_HINTER_MAX_SNAPS]; |
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}; |
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/************************************************************************
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* |
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* <Struct> |
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* T1_Stem_Table |
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* |
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* <Description> |
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* A simple structure used to model a set of stem hints in a |
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* single direction during the loading of a given glyph outline. |
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* Not all stem hints are active at a time. Moreover, stems must |
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* be sorted regularly |
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* |
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* <Fields> |
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* num_stems :: total number of stems in table |
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* num_active :: number of active stems in table |
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* |
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* stems :: the table of all stems |
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* sort :: a table of indices into the stems table, used |
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* to keep a sorted list of the active stems |
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* |
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************************************************************************/ |
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typedef struct T1_Stem_Table_ |
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/*************************************************************************/ |
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/* */ |
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/* <Struct> */ |
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/* T1_Stem_Table */ |
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/* */ |
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/* <Description> */ |
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/* A simple structure used to model a set of stem hints in a single */ |
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/* direction during the loading of a given glyph outline. Not all */ |
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/* stem hints are active at a time. Moreover, stems must be sorted */ |
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/* regularly. */ |
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/* */ |
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/* <Fields> */ |
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/* num_stems :: The total number of stems in the table. */ |
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/* */ |
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/* num_active :: The number of active stems in the table. */ |
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/* */ |
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/* stems :: A table of all stems. */ |
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/* */ |
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/* sort :: A table of indices into the stems table, used to */ |
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/* keep a sorted list of the active stems. */ |
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/* */ |
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typedef struct T1_Stem_Table_ |
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{ |
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FT_Int num_stems; |
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FT_Int num_active; |
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T1_Stem_Hint stems[ T1_HINTER_MAX_EDGES ]; |
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FT_Int sort [ T1_HINTER_MAX_EDGES ]; |
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T1_Stem_Hint stems[T1_HINTER_MAX_EDGES]; |
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FT_Int sort [T1_HINTER_MAX_EDGES]; |
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} T1_Stem_Table; |
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/************************************************************************
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* |
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* <Struct> |
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* T1_Glyph_Hints |
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* |
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* <Description> |
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* A structure used to model the stem hints of a given glyph outline |
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* during glyph loading. |
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* |
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* <Fields> |
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* hori_stems :: horizontal stem hints table |
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* vert_stems :: vertical stem hints table |
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* |
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************************************************************************/ |
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/*************************************************************************/ |
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/* */ |
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/* <Struct> */ |
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/* T1_Glyph_Hints */ |
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/* */ |
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/* <Description> */ |
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/* A structure used to model the stem hints of a given glyph outline */ |
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/* during glyph loading. */ |
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/* */ |
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/* <Fields> */ |
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/* hori_stems :: The horizontal stem hints table. */ |
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/* vert_stems :: The vertical stem hints table. */ |
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/* */ |
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struct T1_Glyph_Hints_ |
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{ |
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T1_Stem_Table hori_stems; |
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@ -224,157 +216,48 @@ |
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}; |
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/************************************************************************
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* |
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* <Data> |
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* t1_hinter_funcs |
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* |
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* <Description> |
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* A table containing the address of various functions used during |
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* the loading of an hinted scaled outline |
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* |
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************************************************************************/ |
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/*************************************************************************/ |
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/* */ |
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/* <Data> */ |
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/* t1_hinter_funcs */ |
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/* */ |
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/* <Description> */ |
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/* A table containing the address of various functions used during */ |
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/* the loading of an hinted scaled outline. */ |
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/* */ |
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LOCAL_DEF |
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const T1_Hinter_Funcs t1_hinter_funcs; |
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/************************************************************************
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* |
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* <Function> |
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* T1_New_Size_Hinter |
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* |
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* <Description> |
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* Allocates a new hinter structure for a given size object |
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* |
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* <Input> |
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* size :: handle to target size object |
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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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************************************************************************/ |
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LOCAL_DEF |
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FT_Error T1_New_Size_Hinter( T1_Size size ); |
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/************************************************************************
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* |
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* <Function> |
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* T1_Done_Size_Hinter |
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* |
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* <Description> |
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* Releases a given size object's hinter structure |
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* |
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* <Input> |
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* size :: handle to target size object |
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* |
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************************************************************************/ |
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LOCAL_DEF |
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void T1_Done_Size_Hinter( T1_Size size ); |
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/************************************************************************
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* |
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* <Function> |
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* T1_Reset_Size_Hinter |
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* |
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* <Description> |
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* Recomputes hinting information when a given size object has |
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* changed its resolutions/char sizes/pixel sizes |
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* |
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* <Input> |
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* size :: handle to size object |
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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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************************************************************************/ |
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void T1_Done_Size_Hinter( T1_Size size ); |
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LOCAL_DEF |
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FT_Error T1_Reset_Size_Hinter( T1_Size size ); |
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/************************************************************************
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* |
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* <Function> |
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* T1_New_Glyph_Hinter |
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* |
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* <Description> |
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* Allocates a new hinter structure for a given glyph slot |
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* |
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* <Input> |
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* glyph :: handle to target glyph slot |
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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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************************************************************************/ |
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LOCAL_DEF |
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FT_Error T1_New_Glyph_Hinter( T1_GlyphSlot glyph ); |
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/************************************************************************
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* |
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* <Function> |
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* T1_Done_Glyph_Hinter |
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* |
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* <Description> |
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* Releases a given glyph slot's hinter structure |
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* |
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* <Input> |
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* glyph :: handle to glyph slot |
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* |
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************************************************************************/ |
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LOCAL_DEF |
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void T1_Done_Glyph_Hinter( T1_GlyphSlot glyph ); |
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void T1_Done_Glyph_Hinter( T1_GlyphSlot glyph ); |
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/************************************************************************
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* |
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* <Function> |
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* T1_Hint_Points |
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* |
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* <Description> |
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* this function grid-fits several points in a given Type 1 builder |
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* at once. |
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* |
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* <Input> |
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* builder :: handle to target Type 1 builder |
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* |
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************************************************************************/ |
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LOCAL_DEF |
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void T1_Hint_Points( T1_Builder* builder ); |
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/************************************************************************
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* |
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* <Function> |
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* T1_Hint_Stems |
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* |
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* <Description> |
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* This function is used to compute the location of each stem hint |
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* between the first and second passes of the glyph loader on the |
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* charstring. |
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* |
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* <Input> |
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* builder :: handle to target builder |
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* |
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************************************************************************/ |
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LOCAL_DEF |
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void T1_Hint_Stems( T1_Builder* builder ); |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* T1HINTER_H */ |
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/* END */ |
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Werner Lemberg
25 years ago