439 lines
15 KiB
C
439 lines
15 KiB
C
/****************************************************************************
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*
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* afadjust.c
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*
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* Auto-fitter routines to adjust components based on charcode (body).
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*
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* Copyright (C) 2023-2024 by
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* David Turner, Robert Wilhelm, and Werner Lemberg.
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*
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* Written by Craig White <gerzytet@gmail.com>.
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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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#include "afadjust.h"
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#include <freetype/freetype.h>
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#include <freetype/internal/ftobjs.h>
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#include <freetype/internal/ftmemory.h>
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#include <freetype/internal/ftdebug.h>
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#define AF_ADJUSTMENT_DATABASE_LENGTH \
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( sizeof ( adjustment_database ) / \
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sizeof ( adjustment_database[0] ) )
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#undef FT_COMPONENT
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#define FT_COMPONENT afadjust
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/*
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All entries in this list must be sorted by ascending Unicode code
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points. The table entries are 3 numbers consisting of:
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- Unicode code point.
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- The vertical adjustment type. This should be one of the enum
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constants in `AF_VerticalSeparationAdjustmentType`.
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- Value 1 if the topmost contour is a tilde and should be prevented from
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flattening, and 0 otherwise.
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*/
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FT_LOCAL_ARRAY_DEF( AF_AdjustmentDatabaseEntry )
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adjustment_database[] =
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{
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{ 0x21, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ! */
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{ 0x69, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* i */
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{ 0x6A, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* j */
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{ 0xA1, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ¡ */
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{ 0xBF, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ¿ */
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{ 0xC0, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* À */
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{ 0xC1, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Á */
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{ 0xC2, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Â */
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{ 0xC3, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 1 }, /* Ã */
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{ 0xC8, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* È */
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{ 0xC9, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* É */
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{ 0xCA, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ê */
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{ 0xCC, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ì */
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{ 0xCD, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Í */
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{ 0xCE, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Î */
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{ 0xD1, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 1 }, /* Ñ */
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{ 0xD2, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ò */
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{ 0xD3, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ó */
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{ 0xD4, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ô */
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{ 0xD5, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 1 }, /* Õ */
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{ 0xD9, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ù */
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{ 0xDA, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ú */
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{ 0xDB, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Û */
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{ 0xDD, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ý */
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{ 0xE0, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* à */
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{ 0xE1, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* á */
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{ 0xE2, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* â */
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{ 0xE3, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 1 }, /* ã */
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{ 0xE8, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* è */
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{ 0xE9, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* é */
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{ 0xEA, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ê */
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{ 0xEC, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ì */
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{ 0xED, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* í */
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{ 0xEE, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* î */
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{ 0xF1, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 1 }, /* ñ */
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{ 0xF2, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ò */
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{ 0xF3, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ó */
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{ 0xF4, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ô */
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{ 0xF5, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 1 }, /* õ */
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{ 0xF9, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ù */
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{ 0xFA, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ú */
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{ 0xFB, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* û */
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{ 0xFD, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ý */
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{ 0x100, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ā */
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{ 0x101, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ā */
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{ 0x102, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ă */
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{ 0x103, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ă */
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{ 0x106, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ć */
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{ 0x107, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ć */
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{ 0x108, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ĉ */
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{ 0x109, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ĉ */
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{ 0x10A, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ċ */
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{ 0x10B, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ċ */
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{ 0x10C, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Č */
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{ 0x10D, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* č */
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{ 0x10E, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ď */
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{ 0x112, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ē */
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{ 0x113, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ē */
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{ 0x114, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ĕ */
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{ 0x115, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ĕ */
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{ 0x116, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ė */
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{ 0x117, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ė */
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{ 0x11A, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ě */
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{ 0x11B, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ě */
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{ 0x11C, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ĝ */
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{ 0x11D, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ĝ */
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{ 0x11E, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ğ */
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{ 0x11F, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ğ */
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{ 0x120, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ġ */
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{ 0x121, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ġ */
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{ 0x123, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ģ */
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{ 0x124, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ĥ */
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{ 0x125, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ĥ */
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{ 0x128, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 1 }, /* Ĩ */
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{ 0x129, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 1 }, /* ĩ */
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{ 0x12A, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ī */
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{ 0x12B, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ī */
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{ 0x12C, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ĭ */
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{ 0x12D, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ĭ */
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{ 0x12F, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* į */
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{ 0x130, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* İ */
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{ 0x133, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ij */
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{ 0x134, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ĵ */
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{ 0x135, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ĵ */
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{ 0x139, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ĺ */
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{ 0x13A, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ĺ */
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{ 0x143, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ń */
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{ 0x144, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ń */
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{ 0x147, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ň */
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{ 0x148, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ň */
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{ 0x14C, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ō */
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{ 0x14D, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ō */
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{ 0x14E, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ŏ */
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{ 0x14F, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ŏ */
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{ 0x154, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ŕ */
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{ 0x155, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ŕ */
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{ 0x158, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ř */
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{ 0x159, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ř */
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{ 0x15A, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ś */
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{ 0x15B, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ś */
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{ 0x15C, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ŝ */
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{ 0x15D, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ŝ */
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{ 0x160, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Š */
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{ 0x161, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* š */
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{ 0x164, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ť */
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{ 0x168, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 1 }, /* Ũ */
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{ 0x169, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 1 }, /* ũ */
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{ 0x16A, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ū */
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{ 0x16B, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ū */
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{ 0x16C, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ŭ */
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{ 0x16D, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ŭ */
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{ 0x174, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ŵ */
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{ 0x175, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ŵ */
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{ 0x176, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ŷ */
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{ 0x177, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ŷ */
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{ 0x179, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ź */
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{ 0x17A, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ź */
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{ 0x17B, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ż */
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{ 0x17C, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* ż */
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{ 0x17D, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 }, /* Ž */
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{ 0x17E, AF_VERTICAL_ADJUSTMENT_TOP_CONTOUR_UP, 0 } /* ž */
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};
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/* Helper function: get the adjustment database entry for a codepoint. */
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static const AF_AdjustmentDatabaseEntry*
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af_adjustment_database_lookup( FT_UInt32 codepoint )
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{
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/* Binary search for database entry */
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FT_Int low = 0;
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FT_Int high = AF_ADJUSTMENT_DATABASE_LENGTH - 1;
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while ( high >= low )
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{
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FT_Int mid = ( low + high ) / 2;
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FT_UInt32 mid_codepoint = adjustment_database[mid].codepoint;
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if ( mid_codepoint < codepoint )
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low = mid + 1;
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else if ( mid_codepoint > codepoint )
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high = mid - 1;
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else
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return &adjustment_database[mid];
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}
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return NULL;
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}
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/* `qsort` compare function for reverse character map. */
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FT_COMPARE_DEF( FT_Int )
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af_reverse_character_map_entry_compare( const void *a,
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const void *b )
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{
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const AF_ReverseMapEntry entry_a = *((const AF_ReverseMapEntry *)a);
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const AF_ReverseMapEntry entry_b = *((const AF_ReverseMapEntry *)b);
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return entry_a.glyph_index < entry_b.glyph_index
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? -1
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: entry_a.glyph_index > entry_b.glyph_index
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? 1
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: 0;
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}
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static FT_UInt32
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af_reverse_character_map_lookup( AF_ReverseCharacterMap map,
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FT_Int glyph_index )
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{
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FT_Int low, high;
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FT_Long length;
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if ( !map )
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return 0;
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length = map->length;
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/* Binary search for reverse character map entry. */
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low = 0;
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high = length - 1;
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while ( high >= low )
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{
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FT_Int mid = ( high + low ) / 2;
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FT_Int mid_glyph_index = map->entries[mid].glyph_index;
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if ( glyph_index < mid_glyph_index )
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high = mid - 1;
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else if ( glyph_index > mid_glyph_index )
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low = mid + 1;
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else
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return map->entries[mid].codepoint;
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}
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return 0;
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}
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FT_LOCAL_DEF( AF_VerticalSeparationAdjustmentType )
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af_lookup_vertical_separation_type( AF_ReverseCharacterMap map,
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FT_Int glyph_index )
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{
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FT_UInt32 codepoint = af_reverse_character_map_lookup( map,
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glyph_index );
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const AF_AdjustmentDatabaseEntry *entry =
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af_adjustment_database_lookup( codepoint );
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if ( !entry )
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return AF_VERTICAL_ADJUSTMENT_NONE;
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return entry->vertical_separation_adjustment_type;
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}
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/* Return 1 if tilde correction should be applied to the topmost */
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/* contour, else 0. */
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FT_LOCAL_DEF( FT_Bool )
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af_lookup_tilde_correction_type( AF_ReverseCharacterMap map,
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FT_Int glyph_index )
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{
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FT_UInt32 codepoint = af_reverse_character_map_lookup( map,
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glyph_index );
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const AF_AdjustmentDatabaseEntry *entry =
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af_adjustment_database_lookup( codepoint );
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if ( !entry )
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return 0;
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return entry->apply_tilde;
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}
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/* Prepare to add one more entry to the reverse character map. */
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/* This is a helper function for `af_reverse_character_map_new`. */
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static FT_Error
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af_reverse_character_map_expand( AF_ReverseCharacterMap map,
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FT_Long *capacity,
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FT_Memory memory )
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{
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FT_Error error;
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if ( map->length < *capacity )
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return FT_Err_Ok;
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if ( map->length == *capacity )
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{
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FT_Long new_capacity = *capacity + *capacity / 2;
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if ( FT_RENEW_ARRAY( map->entries, map->length, new_capacity ) )
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return error;
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*capacity = new_capacity;
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}
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return FT_Err_Ok;
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}
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FT_LOCAL_DEF( FT_Error )
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af_reverse_character_map_new( AF_ReverseCharacterMap *map,
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AF_FaceGlobals globals )
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{
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FT_Error error;
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FT_Face face = globals->face;
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FT_Memory memory = face->memory;
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FT_CharMap old_charmap;
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FT_Long capacity;
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/* Search for a unicode charmap. */
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/* If there isn't one, create a blank map. */
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FT_TRACE4(( "af_reverse_character_map_new:"
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" building reverse character map\n" ));
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/* Back up `face->charmap` because `find_unicode_charmap` sets it. */
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old_charmap = face->charmap;
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if ( ( error = find_unicode_charmap( face ) ) )
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goto Exit;
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*map = NULL;
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if ( FT_NEW( *map ) )
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goto Exit;
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/* Start with a capacity of 10 entries. */
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capacity = 10;
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( *map )->length = 0;
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if ( FT_NEW_ARRAY( ( *map )->entries, capacity ) )
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goto Exit;
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{
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FT_UInt i;
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#ifdef FT_DEBUG_LEVEL_TRACE
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int failed_lookups = 0;
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#endif
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for ( i = 0; i < AF_ADJUSTMENT_DATABASE_LENGTH; i++ )
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{
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FT_UInt32 codepoint = adjustment_database[i].codepoint;
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FT_Int glyph = FT_Get_Char_Index( face, codepoint );
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if ( glyph == 0 )
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{
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#ifdef FT_DEBUG_LEVEL_TRACE
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failed_lookups++;
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#endif
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continue;
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}
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error = af_reverse_character_map_expand( *map, &capacity, memory );
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if ( error )
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goto Exit;
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( *map )->length++;
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( *map )->entries[i].glyph_index = glyph;
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( *map )->entries[i].codepoint = codepoint;
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}
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}
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ft_qsort( ( *map )->entries,
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( *map )->length,
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sizeof ( AF_ReverseMapEntry ),
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af_reverse_character_map_entry_compare );
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FT_TRACE4(( " reverse character map built successfully"
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" with %ld entries\n", (*map)->length ));
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Exit:
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face->charmap = old_charmap;
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if ( error )
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{
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FT_TRACE4(( " error while building reverse character map."
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" Using blank map.\n" ));
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if ( *map )
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|
FT_FREE( ( *map )->entries );
|
|
|
|
FT_FREE( *map );
|
|
*map = NULL;
|
|
return error;
|
|
}
|
|
|
|
return FT_Err_Ok;
|
|
}
|
|
|
|
|
|
FT_LOCAL_DEF( FT_Error )
|
|
af_reverse_character_map_done( AF_ReverseCharacterMap map,
|
|
FT_Memory memory )
|
|
{
|
|
if ( map )
|
|
FT_FREE( map->entries );
|
|
FT_FREE( map );
|
|
|
|
return FT_Err_Ok;
|
|
}
|
|
|
|
|
|
/* END */
|