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5172
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/***************************************************************************/
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2 |
/* */
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/* afhints.c */
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4 |
/* */
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/* Auto-fitter hinting routines (body). */
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/* */
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/* Copyright 2003-2007, 2009-2011 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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#include "afhints.h"
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#include "aferrors.h"
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#include FT_INTERNAL_CALC_H
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22 |
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23 |
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/* Get new segment for given axis. */
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25 |
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26 |
FT_LOCAL_DEF( FT_Error )
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af_axis_hints_new_segment( AF_AxisHints axis,
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FT_Memory memory,
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AF_Segment *asegment )
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{
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FT_Error error = AF_Err_Ok;
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32 |
AF_Segment segment = NULL;
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33 |
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34 |
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if ( axis->num_segments >= axis->max_segments )
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{
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37 |
FT_Int old_max = axis->max_segments;
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FT_Int new_max = old_max;
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FT_Int big_max = (FT_Int)( FT_INT_MAX / sizeof ( *segment ) );
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40 |
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41 |
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42 |
if ( old_max >= big_max )
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{
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error = AF_Err_Out_Of_Memory;
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goto Exit;
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}
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47 |
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new_max += ( new_max >> 2 ) + 4;
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if ( new_max < old_max || new_max > big_max )
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50 |
new_max = big_max;
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51 |
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52 |
if ( FT_RENEW_ARRAY( axis->segments, old_max, new_max ) )
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goto Exit;
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54 |
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axis->max_segments = new_max;
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}
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segment = axis->segments + axis->num_segments++;
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Exit:
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*asegment = segment;
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return error;
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}
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64 |
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/* Get new edge for given axis, direction, and position. */
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FT_LOCAL( FT_Error )
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af_axis_hints_new_edge( AF_AxisHints axis,
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FT_Int fpos,
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AF_Direction dir,
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FT_Memory memory,
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AF_Edge *aedge )
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{
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FT_Error error = AF_Err_Ok;
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AF_Edge edge = NULL;
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AF_Edge edges;
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if ( axis->num_edges >= axis->max_edges )
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{
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FT_Int old_max = axis->max_edges;
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FT_Int new_max = old_max;
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FT_Int big_max = (FT_Int)( FT_INT_MAX / sizeof ( *edge ) );
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if ( old_max >= big_max )
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{
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error = AF_Err_Out_Of_Memory;
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goto Exit;
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}
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new_max += ( new_max >> 2 ) + 4;
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if ( new_max < old_max || new_max > big_max )
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new_max = big_max;
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if ( FT_RENEW_ARRAY( axis->edges, old_max, new_max ) )
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goto Exit;
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axis->max_edges = new_max;
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}
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edges = axis->edges;
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edge = edges + axis->num_edges;
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while ( edge > edges )
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{
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if ( edge[-1].fpos < fpos )
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break;
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/* we want the edge with same position and minor direction */
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/* to appear before those in the major one in the list */
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if ( edge[-1].fpos == fpos && dir == axis->major_dir )
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break;
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edge[0] = edge[-1];
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edge--;
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}
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axis->num_edges++;
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FT_ZERO( edge );
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edge->fpos = (FT_Short)fpos;
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edge->dir = (FT_Char)dir;
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Exit:
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*aedge = edge;
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return error;
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}
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#ifdef FT_DEBUG_AUTOFIT
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#include FT_CONFIG_STANDARD_LIBRARY_H
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static const char*
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af_dir_str( AF_Direction dir )
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{
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const char* result;
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switch ( dir )
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{
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case AF_DIR_UP:
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result = "up";
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break;
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case AF_DIR_DOWN:
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result = "down";
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break;
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case AF_DIR_LEFT:
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result = "left";
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break;
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case AF_DIR_RIGHT:
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result = "right";
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break;
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default:
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result = "none";
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}
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159 |
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return result;
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}
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162 |
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163 |
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#define AF_INDEX_NUM( ptr, base ) ( (ptr) ? ( (ptr) - (base) ) : -1 )
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165 |
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166 |
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#ifdef __cplusplus
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extern "C" {
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#endif
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void
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af_glyph_hints_dump_points( AF_GlyphHints hints )
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{
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AF_Point points = hints->points;
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AF_Point limit = points + hints->num_points;
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AF_Point point;
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176 |
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177 |
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printf( "Table of points:\n" );
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printf( " [ index | xorg | yorg | xscale | yscale"
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" | xfit | yfit | flags ]\n" );
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for ( point = points; point < limit; point++ )
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{
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printf( " [ %5d | %5d | %5d | %6.2f | %6.2f"
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" | %5.2f | %5.2f | %c%c%c%c%c%c ]\n",
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point - points,
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point->fx,
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point->fy,
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point->ox / 64.0,
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point->oy / 64.0,
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point->x / 64.0,
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point->y / 64.0,
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( point->flags & AF_FLAG_WEAK_INTERPOLATION ) ? 'w' : ' ',
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( point->flags & AF_FLAG_INFLECTION ) ? 'i' : ' ',
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( point->flags & AF_FLAG_EXTREMA_X ) ? '<' : ' ',
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( point->flags & AF_FLAG_EXTREMA_Y ) ? 'v' : ' ',
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( point->flags & AF_FLAG_ROUND_X ) ? '(' : ' ',
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( point->flags & AF_FLAG_ROUND_Y ) ? 'u' : ' ');
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}
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printf( "\n" );
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}
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#ifdef __cplusplus
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}
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#endif
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205 |
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206 |
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static const char*
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af_edge_flags_to_string( AF_Edge_Flags flags )
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{
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static char temp[32];
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int pos = 0;
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213 |
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if ( flags & AF_EDGE_ROUND )
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{
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ft_memcpy( temp + pos, "round", 5 );
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pos += 5;
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}
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if ( flags & AF_EDGE_SERIF )
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{
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221 |
if ( pos > 0 )
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temp[pos++] = ' ';
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ft_memcpy( temp + pos, "serif", 5 );
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pos += 5;
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}
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226 |
if ( pos == 0 )
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return "normal";
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228 |
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temp[pos] = 0;
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230 |
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231 |
return temp;
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232 |
}
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233 |
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234 |
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235 |
/* Dump the array of linked segments. */
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236 |
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#ifdef __cplusplus
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238 |
extern "C" {
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239 |
#endif
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240 |
void
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af_glyph_hints_dump_segments( AF_GlyphHints hints )
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{
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243 |
FT_Int dimension;
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244 |
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245 |
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246 |
for ( dimension = 1; dimension >= 0; dimension-- )
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247 |
{
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248 |
AF_AxisHints axis = &hints->axis[dimension];
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249 |
AF_Segment segments = axis->segments;
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250 |
AF_Segment limit = segments + axis->num_segments;
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251 |
AF_Segment seg;
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252 |
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253 |
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254 |
printf ( "Table of %s segments:\n",
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dimension == AF_DIMENSION_HORZ ? "vertical" : "horizontal" );
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256 |
printf ( " [ index | pos | dir | link | serif |"
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257 |
" height | extra | flags ]\n" );
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258 |
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259 |
for ( seg = segments; seg < limit; seg++ )
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260 |
{
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261 |
printf ( " [ %5d | %5.2g | %5s | %4d | %5d | %6d | %5d | %11s ]\n",
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262 |
seg - segments,
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263 |
dimension == AF_DIMENSION_HORZ ? (int)seg->first->ox / 64.0
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264 |
: (int)seg->first->oy / 64.0,
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265 |
af_dir_str( (AF_Direction)seg->dir ),
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266 |
AF_INDEX_NUM( seg->link, segments ),
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267 |
AF_INDEX_NUM( seg->serif, segments ),
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268 |
seg->height,
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269 |
seg->height - ( seg->max_coord - seg->min_coord ),
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270 |
af_edge_flags_to_string( seg->flags ) );
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271 |
}
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272 |
printf( "\n" );
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273 |
}
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274 |
}
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275 |
#ifdef __cplusplus
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276 |
}
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277 |
#endif
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278 |
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279 |
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280 |
/* Dump the array of linked edges. */
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281 |
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282 |
#ifdef __cplusplus
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283 |
extern "C" {
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284 |
#endif
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285 |
void
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286 |
af_glyph_hints_dump_edges( AF_GlyphHints hints )
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287 |
{
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288 |
FT_Int dimension;
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289 |
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290 |
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291 |
for ( dimension = 1; dimension >= 0; dimension-- )
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292 |
{
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293 |
AF_AxisHints axis = &hints->axis[dimension];
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294 |
AF_Edge edges = axis->edges;
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295 |
AF_Edge limit = edges + axis->num_edges;
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296 |
AF_Edge edge;
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297 |
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298 |
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299 |
/*
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300 |
* note: AF_DIMENSION_HORZ corresponds to _vertical_ edges
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301 |
* since they have a constant X coordinate.
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302 |
*/
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303 |
printf ( "Table of %s edges:\n",
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304 |
dimension == AF_DIMENSION_HORZ ? "vertical" : "horizontal" );
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305 |
printf ( " [ index | pos | dir | link |"
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306 |
" serif | blue | opos | pos | flags ]\n" );
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307 |
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308 |
for ( edge = edges; edge < limit; edge++ )
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309 |
{
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310 |
printf ( " [ %5d | %5.2g | %5s | %4d |"
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311 |
" %5d | %c | %5.2f | %5.2f | %11s ]\n",
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312 |
edge - edges,
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313 |
(int)edge->opos / 64.0,
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314 |
af_dir_str( (AF_Direction)edge->dir ),
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315 |
AF_INDEX_NUM( edge->link, edges ),
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316 |
AF_INDEX_NUM( edge->serif, edges ),
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317 |
edge->blue_edge ? 'y' : 'n',
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318 |
edge->opos / 64.0,
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319 |
edge->pos / 64.0,
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320 |
af_edge_flags_to_string( edge->flags ) );
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321 |
}
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322 |
printf( "\n" );
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323 |
}
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324 |
}
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325 |
#ifdef __cplusplus
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326 |
}
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327 |
#endif
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328 |
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329 |
#else /* !FT_DEBUG_AUTOFIT */
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330 |
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331 |
/* these empty stubs are only used to link the `ftgrid' test program */
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332 |
/* if debugging is disabled */
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333 |
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334 |
#ifdef __cplusplus
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335 |
extern "C" {
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336 |
#endif
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337 |
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338 |
void
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339 |
af_glyph_hints_dump_points( AF_GlyphHints hints )
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|
340 |
{
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341 |
FT_UNUSED( hints );
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342 |
}
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343 |
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344 |
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345 |
void
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|
346 |
af_glyph_hints_dump_segments( AF_GlyphHints hints )
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|
347 |
{
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348 |
FT_UNUSED( hints );
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349 |
}
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350 |
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351 |
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352 |
void
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|
353 |
af_glyph_hints_dump_edges( AF_GlyphHints hints )
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|
354 |
{
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355 |
FT_UNUSED( hints );
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|
356 |
}
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357 |
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358 |
#ifdef __cplusplus
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359 |
}
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|
360 |
#endif
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361 |
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362 |
#endif /* !FT_DEBUG_AUTOFIT */
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363 |
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364 |
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|
365 |
/* Compute the direction value of a given vector. */
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366 |
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|
367 |
FT_LOCAL_DEF( AF_Direction )
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|
368 |
af_direction_compute( FT_Pos dx,
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|
369 |
FT_Pos dy )
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|
370 |
{
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|
371 |
FT_Pos ll, ss; /* long and short arm lengths */
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|
372 |
AF_Direction dir; /* candidate direction */
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373 |
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374 |
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|
375 |
if ( dy >= dx )
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|
376 |
{
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|
377 |
if ( dy >= -dx )
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|
378 |
{
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|
379 |
dir = AF_DIR_UP;
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|
380 |
ll = dy;
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|
381 |
ss = dx;
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|
382 |
}
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|
383 |
else
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|
384 |
{
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|
385 |
dir = AF_DIR_LEFT;
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|
386 |
ll = -dx;
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|
387 |
ss = dy;
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|
388 |
}
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|
389 |
}
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|
390 |
else /* dy < dx */
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|
391 |
{
|
|
|
392 |
if ( dy >= -dx )
|
|
|
393 |
{
|
|
|
394 |
dir = AF_DIR_RIGHT;
|
|
|
395 |
ll = dx;
|
|
|
396 |
ss = dy;
|
|
|
397 |
}
|
|
|
398 |
else
|
|
|
399 |
{
|
|
|
400 |
dir = AF_DIR_DOWN;
|
|
|
401 |
ll = dy;
|
|
|
402 |
ss = dx;
|
|
|
403 |
}
|
|
|
404 |
}
|
|
|
405 |
|
|
|
406 |
/* return no direction if arm lengths differ too much */
|
|
|
407 |
/* (value 14 is heuristic) */
|
|
|
408 |
ss *= 14;
|
|
|
409 |
if ( FT_ABS( ll ) <= FT_ABS( ss ) )
|
|
|
410 |
dir = AF_DIR_NONE;
|
|
|
411 |
|
|
|
412 |
return dir;
|
|
|
413 |
}
|
|
|
414 |
|
|
|
415 |
|
|
|
416 |
FT_LOCAL_DEF( void )
|
|
|
417 |
af_glyph_hints_init( AF_GlyphHints hints,
|
|
|
418 |
FT_Memory memory )
|
|
|
419 |
{
|
|
|
420 |
FT_ZERO( hints );
|
|
|
421 |
hints->memory = memory;
|
|
|
422 |
}
|
|
|
423 |
|
|
|
424 |
|
|
|
425 |
FT_LOCAL_DEF( void )
|
|
|
426 |
af_glyph_hints_done( AF_GlyphHints hints )
|
|
|
427 |
{
|
|
|
428 |
if ( hints && hints->memory )
|
|
|
429 |
{
|
|
|
430 |
FT_Memory memory = hints->memory;
|
|
|
431 |
int dim;
|
|
|
432 |
|
|
|
433 |
|
|
|
434 |
/*
|
|
|
435 |
* note that we don't need to free the segment and edge
|
|
|
436 |
* buffers since they are really within the hints->points array
|
|
|
437 |
*/
|
|
|
438 |
for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
|
|
|
439 |
{
|
|
|
440 |
AF_AxisHints axis = &hints->axis[dim];
|
|
|
441 |
|
|
|
442 |
|
|
|
443 |
axis->num_segments = 0;
|
|
|
444 |
axis->max_segments = 0;
|
|
|
445 |
FT_FREE( axis->segments );
|
|
|
446 |
|
|
|
447 |
axis->num_edges = 0;
|
|
|
448 |
axis->max_edges = 0;
|
|
|
449 |
FT_FREE( axis->edges );
|
|
|
450 |
}
|
|
|
451 |
|
|
|
452 |
FT_FREE( hints->contours );
|
|
|
453 |
hints->max_contours = 0;
|
|
|
454 |
hints->num_contours = 0;
|
|
|
455 |
|
|
|
456 |
FT_FREE( hints->points );
|
|
|
457 |
hints->num_points = 0;
|
|
|
458 |
hints->max_points = 0;
|
|
|
459 |
|
|
|
460 |
hints->memory = NULL;
|
|
|
461 |
}
|
|
|
462 |
}
|
|
|
463 |
|
|
|
464 |
|
|
|
465 |
/* Reset metrics. */
|
|
|
466 |
|
|
|
467 |
FT_LOCAL_DEF( void )
|
|
|
468 |
af_glyph_hints_rescale( AF_GlyphHints hints,
|
|
|
469 |
AF_ScriptMetrics metrics )
|
|
|
470 |
{
|
|
|
471 |
hints->metrics = metrics;
|
|
|
472 |
hints->scaler_flags = metrics->scaler.flags;
|
|
|
473 |
}
|
|
|
474 |
|
|
|
475 |
|
|
|
476 |
/* Recompute all AF_Point in AF_GlyphHints from the definitions */
|
|
|
477 |
/* in a source outline. */
|
|
|
478 |
|
|
|
479 |
FT_LOCAL_DEF( FT_Error )
|
|
|
480 |
af_glyph_hints_reload( AF_GlyphHints hints,
|
|
|
481 |
FT_Outline* outline )
|
|
|
482 |
{
|
|
|
483 |
FT_Error error = AF_Err_Ok;
|
|
|
484 |
AF_Point points;
|
|
|
485 |
FT_UInt old_max, new_max;
|
|
|
486 |
FT_Fixed x_scale = hints->x_scale;
|
|
|
487 |
FT_Fixed y_scale = hints->y_scale;
|
|
|
488 |
FT_Pos x_delta = hints->x_delta;
|
|
|
489 |
FT_Pos y_delta = hints->y_delta;
|
|
|
490 |
FT_Memory memory = hints->memory;
|
|
|
491 |
|
|
|
492 |
|
|
|
493 |
hints->num_points = 0;
|
|
|
494 |
hints->num_contours = 0;
|
|
|
495 |
|
|
|
496 |
hints->axis[0].num_segments = 0;
|
|
|
497 |
hints->axis[0].num_edges = 0;
|
|
|
498 |
hints->axis[1].num_segments = 0;
|
|
|
499 |
hints->axis[1].num_edges = 0;
|
|
|
500 |
|
|
|
501 |
/* first of all, reallocate the contours array if necessary */
|
|
|
502 |
new_max = (FT_UInt)outline->n_contours;
|
|
|
503 |
old_max = hints->max_contours;
|
|
|
504 |
if ( new_max > old_max )
|
|
|
505 |
{
|
|
|
506 |
new_max = ( new_max + 3 ) & ~3; /* round up to a multiple of 4 */
|
|
|
507 |
|
|
|
508 |
if ( FT_RENEW_ARRAY( hints->contours, old_max, new_max ) )
|
|
|
509 |
goto Exit;
|
|
|
510 |
|
|
|
511 |
hints->max_contours = new_max;
|
|
|
512 |
}
|
|
|
513 |
|
|
|
514 |
/*
|
|
|
515 |
* then reallocate the points arrays if necessary --
|
|
|
516 |
* note that we reserve two additional point positions, used to
|
|
|
517 |
* hint metrics appropriately
|
|
|
518 |
*/
|
|
|
519 |
new_max = (FT_UInt)( outline->n_points + 2 );
|
|
|
520 |
old_max = hints->max_points;
|
|
|
521 |
if ( new_max > old_max )
|
|
|
522 |
{
|
|
|
523 |
new_max = ( new_max + 2 + 7 ) & ~7; /* round up to a multiple of 8 */
|
|
|
524 |
|
|
|
525 |
if ( FT_RENEW_ARRAY( hints->points, old_max, new_max ) )
|
|
|
526 |
goto Exit;
|
|
|
527 |
|
|
|
528 |
hints->max_points = new_max;
|
|
|
529 |
}
|
|
|
530 |
|
|
|
531 |
hints->num_points = outline->n_points;
|
|
|
532 |
hints->num_contours = outline->n_contours;
|
|
|
533 |
|
|
|
534 |
/* We can't rely on the value of `FT_Outline.flags' to know the fill */
|
|
|
535 |
/* direction used for a glyph, given that some fonts are broken (e.g., */
|
|
|
536 |
/* the Arphic ones). We thus recompute it each time we need to. */
|
|
|
537 |
/* */
|
|
|
538 |
hints->axis[AF_DIMENSION_HORZ].major_dir = AF_DIR_UP;
|
|
|
539 |
hints->axis[AF_DIMENSION_VERT].major_dir = AF_DIR_LEFT;
|
|
|
540 |
|
|
|
541 |
if ( FT_Outline_Get_Orientation( outline ) == FT_ORIENTATION_POSTSCRIPT )
|
|
|
542 |
{
|
|
|
543 |
hints->axis[AF_DIMENSION_HORZ].major_dir = AF_DIR_DOWN;
|
|
|
544 |
hints->axis[AF_DIMENSION_VERT].major_dir = AF_DIR_RIGHT;
|
|
|
545 |
}
|
|
|
546 |
|
|
|
547 |
hints->x_scale = x_scale;
|
|
|
548 |
hints->y_scale = y_scale;
|
|
|
549 |
hints->x_delta = x_delta;
|
|
|
550 |
hints->y_delta = y_delta;
|
|
|
551 |
|
|
|
552 |
hints->xmin_delta = 0;
|
|
|
553 |
hints->xmax_delta = 0;
|
|
|
554 |
|
|
|
555 |
points = hints->points;
|
|
|
556 |
if ( hints->num_points == 0 )
|
|
|
557 |
goto Exit;
|
|
|
558 |
|
|
|
559 |
{
|
|
|
560 |
AF_Point point;
|
|
|
561 |
AF_Point point_limit = points + hints->num_points;
|
|
|
562 |
|
|
|
563 |
|
|
|
564 |
/* compute coordinates & Bezier flags, next and prev */
|
|
|
565 |
{
|
|
|
566 |
FT_Vector* vec = outline->points;
|
|
|
567 |
char* tag = outline->tags;
|
|
|
568 |
AF_Point end = points + outline->contours[0];
|
|
|
569 |
AF_Point prev = end;
|
|
|
570 |
FT_Int contour_index = 0;
|
|
|
571 |
|
|
|
572 |
|
|
|
573 |
for ( point = points; point < point_limit; point++, vec++, tag++ )
|
|
|
574 |
{
|
|
|
575 |
point->fx = (FT_Short)vec->x;
|
|
|
576 |
point->fy = (FT_Short)vec->y;
|
|
|
577 |
point->ox = point->x = FT_MulFix( vec->x, x_scale ) + x_delta;
|
|
|
578 |
point->oy = point->y = FT_MulFix( vec->y, y_scale ) + y_delta;
|
|
|
579 |
|
|
|
580 |
switch ( FT_CURVE_TAG( *tag ) )
|
|
|
581 |
{
|
|
|
582 |
case FT_CURVE_TAG_CONIC:
|
|
|
583 |
point->flags = AF_FLAG_CONIC;
|
|
|
584 |
break;
|
|
|
585 |
case FT_CURVE_TAG_CUBIC:
|
|
|
586 |
point->flags = AF_FLAG_CUBIC;
|
|
|
587 |
break;
|
|
|
588 |
default:
|
|
|
589 |
point->flags = AF_FLAG_NONE;
|
|
|
590 |
}
|
|
|
591 |
|
|
|
592 |
point->prev = prev;
|
|
|
593 |
prev->next = point;
|
|
|
594 |
prev = point;
|
|
|
595 |
|
|
|
596 |
if ( point == end )
|
|
|
597 |
{
|
|
|
598 |
if ( ++contour_index < outline->n_contours )
|
|
|
599 |
{
|
|
|
600 |
end = points + outline->contours[contour_index];
|
|
|
601 |
prev = end;
|
|
|
602 |
}
|
|
|
603 |
}
|
|
|
604 |
}
|
|
|
605 |
}
|
|
|
606 |
|
|
|
607 |
/* set up the contours array */
|
|
|
608 |
{
|
|
|
609 |
AF_Point* contour = hints->contours;
|
|
|
610 |
AF_Point* contour_limit = contour + hints->num_contours;
|
|
|
611 |
short* end = outline->contours;
|
|
|
612 |
short idx = 0;
|
|
|
613 |
|
|
|
614 |
|
|
|
615 |
for ( ; contour < contour_limit; contour++, end++ )
|
|
|
616 |
{
|
|
|
617 |
contour[0] = points + idx;
|
|
|
618 |
idx = (short)( end[0] + 1 );
|
|
|
619 |
}
|
|
|
620 |
}
|
|
|
621 |
|
|
|
622 |
/* compute directions of in & out vectors */
|
|
|
623 |
{
|
|
|
624 |
AF_Point first = points;
|
|
|
625 |
AF_Point prev = NULL;
|
|
|
626 |
FT_Pos in_x = 0;
|
|
|
627 |
FT_Pos in_y = 0;
|
|
|
628 |
AF_Direction in_dir = AF_DIR_NONE;
|
|
|
629 |
|
|
|
630 |
|
|
|
631 |
for ( point = points; point < point_limit; point++ )
|
|
|
632 |
{
|
|
|
633 |
AF_Point next;
|
|
|
634 |
FT_Pos out_x, out_y;
|
|
|
635 |
|
|
|
636 |
|
|
|
637 |
if ( point == first )
|
|
|
638 |
{
|
|
|
639 |
prev = first->prev;
|
|
|
640 |
in_x = first->fx - prev->fx;
|
|
|
641 |
in_y = first->fy - prev->fy;
|
|
|
642 |
in_dir = af_direction_compute( in_x, in_y );
|
|
|
643 |
first = prev + 1;
|
|
|
644 |
}
|
|
|
645 |
|
|
|
646 |
point->in_dir = (FT_Char)in_dir;
|
|
|
647 |
|
|
|
648 |
next = point->next;
|
|
|
649 |
out_x = next->fx - point->fx;
|
|
|
650 |
out_y = next->fy - point->fy;
|
|
|
651 |
|
|
|
652 |
in_dir = af_direction_compute( out_x, out_y );
|
|
|
653 |
point->out_dir = (FT_Char)in_dir;
|
|
|
654 |
|
|
|
655 |
/* check for weak points */
|
|
|
656 |
|
|
|
657 |
if ( point->flags & ( AF_FLAG_CONIC | AF_FLAG_CUBIC ) )
|
|
|
658 |
{
|
|
|
659 |
Is_Weak_Point:
|
|
|
660 |
point->flags |= AF_FLAG_WEAK_INTERPOLATION;
|
|
|
661 |
}
|
|
|
662 |
else if ( point->out_dir == point->in_dir )
|
|
|
663 |
{
|
|
|
664 |
if ( point->out_dir != AF_DIR_NONE )
|
|
|
665 |
goto Is_Weak_Point;
|
|
|
666 |
|
|
|
667 |
if ( ft_corner_is_flat( in_x, in_y, out_x, out_y ) )
|
|
|
668 |
goto Is_Weak_Point;
|
|
|
669 |
}
|
|
|
670 |
else if ( point->in_dir == -point->out_dir )
|
|
|
671 |
goto Is_Weak_Point;
|
|
|
672 |
|
|
|
673 |
in_x = out_x;
|
|
|
674 |
in_y = out_y;
|
|
|
675 |
prev = point;
|
|
|
676 |
}
|
|
|
677 |
}
|
|
|
678 |
}
|
|
|
679 |
|
|
|
680 |
Exit:
|
|
|
681 |
return error;
|
|
|
682 |
}
|
|
|
683 |
|
|
|
684 |
|
|
|
685 |
/* Store the hinted outline in an FT_Outline structure. */
|
|
|
686 |
|
|
|
687 |
FT_LOCAL_DEF( void )
|
|
|
688 |
af_glyph_hints_save( AF_GlyphHints hints,
|
|
|
689 |
FT_Outline* outline )
|
|
|
690 |
{
|
|
|
691 |
AF_Point point = hints->points;
|
|
|
692 |
AF_Point limit = point + hints->num_points;
|
|
|
693 |
FT_Vector* vec = outline->points;
|
|
|
694 |
char* tag = outline->tags;
|
|
|
695 |
|
|
|
696 |
|
|
|
697 |
for ( ; point < limit; point++, vec++, tag++ )
|
|
|
698 |
{
|
|
|
699 |
vec->x = point->x;
|
|
|
700 |
vec->y = point->y;
|
|
|
701 |
|
|
|
702 |
if ( point->flags & AF_FLAG_CONIC )
|
|
|
703 |
tag[0] = FT_CURVE_TAG_CONIC;
|
|
|
704 |
else if ( point->flags & AF_FLAG_CUBIC )
|
|
|
705 |
tag[0] = FT_CURVE_TAG_CUBIC;
|
|
|
706 |
else
|
|
|
707 |
tag[0] = FT_CURVE_TAG_ON;
|
|
|
708 |
}
|
|
|
709 |
}
|
|
|
710 |
|
|
|
711 |
|
|
|
712 |
/****************************************************************
|
|
|
713 |
*
|
|
|
714 |
* EDGE POINT GRID-FITTING
|
|
|
715 |
*
|
|
|
716 |
****************************************************************/
|
|
|
717 |
|
|
|
718 |
|
|
|
719 |
/* Align all points of an edge to the same coordinate value, */
|
|
|
720 |
/* either horizontally or vertically. */
|
|
|
721 |
|
|
|
722 |
FT_LOCAL_DEF( void )
|
|
|
723 |
af_glyph_hints_align_edge_points( AF_GlyphHints hints,
|
|
|
724 |
AF_Dimension dim )
|
|
|
725 |
{
|
|
|
726 |
AF_AxisHints axis = & hints->axis[dim];
|
|
|
727 |
AF_Segment segments = axis->segments;
|
|
|
728 |
AF_Segment segment_limit = segments + axis->num_segments;
|
|
|
729 |
AF_Segment seg;
|
|
|
730 |
|
|
|
731 |
|
|
|
732 |
if ( dim == AF_DIMENSION_HORZ )
|
|
|
733 |
{
|
|
|
734 |
for ( seg = segments; seg < segment_limit; seg++ )
|
|
|
735 |
{
|
|
|
736 |
AF_Edge edge = seg->edge;
|
|
|
737 |
AF_Point point, first, last;
|
|
|
738 |
|
|
|
739 |
|
|
|
740 |
if ( edge == NULL )
|
|
|
741 |
continue;
|
|
|
742 |
|
|
|
743 |
first = seg->first;
|
|
|
744 |
last = seg->last;
|
|
|
745 |
point = first;
|
|
|
746 |
for (;;)
|
|
|
747 |
{
|
|
|
748 |
point->x = edge->pos;
|
|
|
749 |
point->flags |= AF_FLAG_TOUCH_X;
|
|
|
750 |
|
|
|
751 |
if ( point == last )
|
|
|
752 |
break;
|
|
|
753 |
|
|
|
754 |
point = point->next;
|
|
|
755 |
}
|
|
|
756 |
}
|
|
|
757 |
}
|
|
|
758 |
else
|
|
|
759 |
{
|
|
|
760 |
for ( seg = segments; seg < segment_limit; seg++ )
|
|
|
761 |
{
|
|
|
762 |
AF_Edge edge = seg->edge;
|
|
|
763 |
AF_Point point, first, last;
|
|
|
764 |
|
|
|
765 |
|
|
|
766 |
if ( edge == NULL )
|
|
|
767 |
continue;
|
|
|
768 |
|
|
|
769 |
first = seg->first;
|
|
|
770 |
last = seg->last;
|
|
|
771 |
point = first;
|
|
|
772 |
for (;;)
|
|
|
773 |
{
|
|
|
774 |
point->y = edge->pos;
|
|
|
775 |
point->flags |= AF_FLAG_TOUCH_Y;
|
|
|
776 |
|
|
|
777 |
if ( point == last )
|
|
|
778 |
break;
|
|
|
779 |
|
|
|
780 |
point = point->next;
|
|
|
781 |
}
|
|
|
782 |
}
|
|
|
783 |
}
|
|
|
784 |
}
|
|
|
785 |
|
|
|
786 |
|
|
|
787 |
/****************************************************************
|
|
|
788 |
*
|
|
|
789 |
* STRONG POINT INTERPOLATION
|
|
|
790 |
*
|
|
|
791 |
****************************************************************/
|
|
|
792 |
|
|
|
793 |
|
|
|
794 |
/* Hint the strong points -- this is equivalent to the TrueType `IP' */
|
|
|
795 |
/* hinting instruction. */
|
|
|
796 |
|
|
|
797 |
FT_LOCAL_DEF( void )
|
|
|
798 |
af_glyph_hints_align_strong_points( AF_GlyphHints hints,
|
|
|
799 |
AF_Dimension dim )
|
|
|
800 |
{
|
|
|
801 |
AF_Point points = hints->points;
|
|
|
802 |
AF_Point point_limit = points + hints->num_points;
|
|
|
803 |
AF_AxisHints axis = &hints->axis[dim];
|
|
|
804 |
AF_Edge edges = axis->edges;
|
|
|
805 |
AF_Edge edge_limit = edges + axis->num_edges;
|
|
|
806 |
AF_Flags touch_flag;
|
|
|
807 |
|
|
|
808 |
|
|
|
809 |
if ( dim == AF_DIMENSION_HORZ )
|
|
|
810 |
touch_flag = AF_FLAG_TOUCH_X;
|
|
|
811 |
else
|
|
|
812 |
touch_flag = AF_FLAG_TOUCH_Y;
|
|
|
813 |
|
|
|
814 |
if ( edges < edge_limit )
|
|
|
815 |
{
|
|
|
816 |
AF_Point point;
|
|
|
817 |
AF_Edge edge;
|
|
|
818 |
|
|
|
819 |
|
|
|
820 |
for ( point = points; point < point_limit; point++ )
|
|
|
821 |
{
|
|
|
822 |
FT_Pos u, ou, fu; /* point position */
|
|
|
823 |
FT_Pos delta;
|
|
|
824 |
|
|
|
825 |
|
|
|
826 |
if ( point->flags & touch_flag )
|
|
|
827 |
continue;
|
|
|
828 |
|
|
|
829 |
/* if this point is candidate to weak interpolation, we */
|
|
|
830 |
/* interpolate it after all strong points have been processed */
|
|
|
831 |
|
|
|
832 |
if ( ( point->flags & AF_FLAG_WEAK_INTERPOLATION ) &&
|
|
|
833 |
!( point->flags & AF_FLAG_INFLECTION ) )
|
|
|
834 |
continue;
|
|
|
835 |
|
|
|
836 |
if ( dim == AF_DIMENSION_VERT )
|
|
|
837 |
{
|
|
|
838 |
u = point->fy;
|
|
|
839 |
ou = point->oy;
|
|
|
840 |
}
|
|
|
841 |
else
|
|
|
842 |
{
|
|
|
843 |
u = point->fx;
|
|
|
844 |
ou = point->ox;
|
|
|
845 |
}
|
|
|
846 |
|
|
|
847 |
fu = u;
|
|
|
848 |
|
|
|
849 |
/* is the point before the first edge? */
|
|
|
850 |
edge = edges;
|
|
|
851 |
delta = edge->fpos - u;
|
|
|
852 |
if ( delta >= 0 )
|
|
|
853 |
{
|
|
|
854 |
u = edge->pos - ( edge->opos - ou );
|
|
|
855 |
goto Store_Point;
|
|
|
856 |
}
|
|
|
857 |
|
|
|
858 |
/* is the point after the last edge? */
|
|
|
859 |
edge = edge_limit - 1;
|
|
|
860 |
delta = u - edge->fpos;
|
|
|
861 |
if ( delta >= 0 )
|
|
|
862 |
{
|
|
|
863 |
u = edge->pos + ( ou - edge->opos );
|
|
|
864 |
goto Store_Point;
|
|
|
865 |
}
|
|
|
866 |
|
|
|
867 |
{
|
|
|
868 |
FT_PtrDist min, max, mid;
|
|
|
869 |
FT_Pos fpos;
|
|
|
870 |
|
|
|
871 |
|
|
|
872 |
/* find enclosing edges */
|
|
|
873 |
min = 0;
|
|
|
874 |
max = edge_limit - edges;
|
|
|
875 |
|
|
|
876 |
#if 1
|
|
|
877 |
/* for a small number of edges, a linear search is better */
|
|
|
878 |
if ( max <= 8 )
|
|
|
879 |
{
|
|
|
880 |
FT_PtrDist nn;
|
|
|
881 |
|
|
|
882 |
|
|
|
883 |
for ( nn = 0; nn < max; nn++ )
|
|
|
884 |
if ( edges[nn].fpos >= u )
|
|
|
885 |
break;
|
|
|
886 |
|
|
|
887 |
if ( edges[nn].fpos == u )
|
|
|
888 |
{
|
|
|
889 |
u = edges[nn].pos;
|
|
|
890 |
goto Store_Point;
|
|
|
891 |
}
|
|
|
892 |
min = nn;
|
|
|
893 |
}
|
|
|
894 |
else
|
|
|
895 |
#endif
|
|
|
896 |
while ( min < max )
|
|
|
897 |
{
|
|
|
898 |
mid = ( max + min ) >> 1;
|
|
|
899 |
edge = edges + mid;
|
|
|
900 |
fpos = edge->fpos;
|
|
|
901 |
|
|
|
902 |
if ( u < fpos )
|
|
|
903 |
max = mid;
|
|
|
904 |
else if ( u > fpos )
|
|
|
905 |
min = mid + 1;
|
|
|
906 |
else
|
|
|
907 |
{
|
|
|
908 |
/* we are on the edge */
|
|
|
909 |
u = edge->pos;
|
|
|
910 |
goto Store_Point;
|
|
|
911 |
}
|
|
|
912 |
}
|
|
|
913 |
|
|
|
914 |
/* point is not on an edge */
|
|
|
915 |
{
|
|
|
916 |
AF_Edge before = edges + min - 1;
|
|
|
917 |
AF_Edge after = edges + min + 0;
|
|
|
918 |
|
|
|
919 |
|
|
|
920 |
/* assert( before && after && before != after ) */
|
|
|
921 |
if ( before->scale == 0 )
|
|
|
922 |
before->scale = FT_DivFix( after->pos - before->pos,
|
|
|
923 |
after->fpos - before->fpos );
|
|
|
924 |
|
|
|
925 |
u = before->pos + FT_MulFix( fu - before->fpos,
|
|
|
926 |
before->scale );
|
|
|
927 |
}
|
|
|
928 |
}
|
|
|
929 |
|
|
|
930 |
Store_Point:
|
|
|
931 |
/* save the point position */
|
|
|
932 |
if ( dim == AF_DIMENSION_HORZ )
|
|
|
933 |
point->x = u;
|
|
|
934 |
else
|
|
|
935 |
point->y = u;
|
|
|
936 |
|
|
|
937 |
point->flags |= touch_flag;
|
|
|
938 |
}
|
|
|
939 |
}
|
|
|
940 |
}
|
|
|
941 |
|
|
|
942 |
|
|
|
943 |
/****************************************************************
|
|
|
944 |
*
|
|
|
945 |
* WEAK POINT INTERPOLATION
|
|
|
946 |
*
|
|
|
947 |
****************************************************************/
|
|
|
948 |
|
|
|
949 |
|
|
|
950 |
/* Shift the original coordinates of all points between `p1' and */
|
|
|
951 |
/* `p2' to get hinted coordinates, using the same difference as */
|
|
|
952 |
/* given by `ref'. */
|
|
|
953 |
|
|
|
954 |
static void
|
|
|
955 |
af_iup_shift( AF_Point p1,
|
|
|
956 |
AF_Point p2,
|
|
|
957 |
AF_Point ref )
|
|
|
958 |
{
|
|
|
959 |
AF_Point p;
|
|
|
960 |
FT_Pos delta = ref->u - ref->v;
|
|
|
961 |
|
|
|
962 |
|
|
|
963 |
if ( delta == 0 )
|
|
|
964 |
return;
|
|
|
965 |
|
|
|
966 |
for ( p = p1; p < ref; p++ )
|
|
|
967 |
p->u = p->v + delta;
|
|
|
968 |
|
|
|
969 |
for ( p = ref + 1; p <= p2; p++ )
|
|
|
970 |
p->u = p->v + delta;
|
|
|
971 |
}
|
|
|
972 |
|
|
|
973 |
|
|
|
974 |
/* Interpolate the original coordinates of all points between `p1' and */
|
|
|
975 |
/* `p2' to get hinted coordinates, using `ref1' and `ref2' as the */
|
|
|
976 |
/* reference points. The `u' and `v' members are the current and */
|
|
|
977 |
/* original coordinate values, respectively. */
|
|
|
978 |
/* */
|
|
|
979 |
/* Details can be found in the TrueType bytecode specification. */
|
|
|
980 |
|
|
|
981 |
static void
|
|
|
982 |
af_iup_interp( AF_Point p1,
|
|
|
983 |
AF_Point p2,
|
|
|
984 |
AF_Point ref1,
|
|
|
985 |
AF_Point ref2 )
|
|
|
986 |
{
|
|
|
987 |
AF_Point p;
|
|
|
988 |
FT_Pos u;
|
|
|
989 |
FT_Pos v1 = ref1->v;
|
|
|
990 |
FT_Pos v2 = ref2->v;
|
|
|
991 |
FT_Pos d1 = ref1->u - v1;
|
|
|
992 |
FT_Pos d2 = ref2->u - v2;
|
|
|
993 |
|
|
|
994 |
|
|
|
995 |
if ( p1 > p2 )
|
|
|
996 |
return;
|
|
|
997 |
|
|
|
998 |
if ( v1 == v2 )
|
|
|
999 |
{
|
|
|
1000 |
for ( p = p1; p <= p2; p++ )
|
|
|
1001 |
{
|
|
|
1002 |
u = p->v;
|
|
|
1003 |
|
|
|
1004 |
if ( u <= v1 )
|
|
|
1005 |
u += d1;
|
|
|
1006 |
else
|
|
|
1007 |
u += d2;
|
|
|
1008 |
|
|
|
1009 |
p->u = u;
|
|
|
1010 |
}
|
|
|
1011 |
return;
|
|
|
1012 |
}
|
|
|
1013 |
|
|
|
1014 |
if ( v1 < v2 )
|
|
|
1015 |
{
|
|
|
1016 |
for ( p = p1; p <= p2; p++ )
|
|
|
1017 |
{
|
|
|
1018 |
u = p->v;
|
|
|
1019 |
|
|
|
1020 |
if ( u <= v1 )
|
|
|
1021 |
u += d1;
|
|
|
1022 |
else if ( u >= v2 )
|
|
|
1023 |
u += d2;
|
|
|
1024 |
else
|
|
|
1025 |
u = ref1->u + FT_MulDiv( u - v1, ref2->u - ref1->u, v2 - v1 );
|
|
|
1026 |
|
|
|
1027 |
p->u = u;
|
|
|
1028 |
}
|
|
|
1029 |
}
|
|
|
1030 |
else
|
|
|
1031 |
{
|
|
|
1032 |
for ( p = p1; p <= p2; p++ )
|
|
|
1033 |
{
|
|
|
1034 |
u = p->v;
|
|
|
1035 |
|
|
|
1036 |
if ( u <= v2 )
|
|
|
1037 |
u += d2;
|
|
|
1038 |
else if ( u >= v1 )
|
|
|
1039 |
u += d1;
|
|
|
1040 |
else
|
|
|
1041 |
u = ref1->u + FT_MulDiv( u - v1, ref2->u - ref1->u, v2 - v1 );
|
|
|
1042 |
|
|
|
1043 |
p->u = u;
|
|
|
1044 |
}
|
|
|
1045 |
}
|
|
|
1046 |
}
|
|
|
1047 |
|
|
|
1048 |
|
|
|
1049 |
/* Hint the weak points -- this is equivalent to the TrueType `IUP' */
|
|
|
1050 |
/* hinting instruction. */
|
|
|
1051 |
|
|
|
1052 |
FT_LOCAL_DEF( void )
|
|
|
1053 |
af_glyph_hints_align_weak_points( AF_GlyphHints hints,
|
|
|
1054 |
AF_Dimension dim )
|
|
|
1055 |
{
|
|
|
1056 |
AF_Point points = hints->points;
|
|
|
1057 |
AF_Point point_limit = points + hints->num_points;
|
|
|
1058 |
AF_Point* contour = hints->contours;
|
|
|
1059 |
AF_Point* contour_limit = contour + hints->num_contours;
|
|
|
1060 |
AF_Flags touch_flag;
|
|
|
1061 |
AF_Point point;
|
|
|
1062 |
AF_Point end_point;
|
|
|
1063 |
AF_Point first_point;
|
|
|
1064 |
|
|
|
1065 |
|
|
|
1066 |
/* PASS 1: Move segment points to edge positions */
|
|
|
1067 |
|
|
|
1068 |
if ( dim == AF_DIMENSION_HORZ )
|
|
|
1069 |
{
|
|
|
1070 |
touch_flag = AF_FLAG_TOUCH_X;
|
|
|
1071 |
|
|
|
1072 |
for ( point = points; point < point_limit; point++ )
|
|
|
1073 |
{
|
|
|
1074 |
point->u = point->x;
|
|
|
1075 |
point->v = point->ox;
|
|
|
1076 |
}
|
|
|
1077 |
}
|
|
|
1078 |
else
|
|
|
1079 |
{
|
|
|
1080 |
touch_flag = AF_FLAG_TOUCH_Y;
|
|
|
1081 |
|
|
|
1082 |
for ( point = points; point < point_limit; point++ )
|
|
|
1083 |
{
|
|
|
1084 |
point->u = point->y;
|
|
|
1085 |
point->v = point->oy;
|
|
|
1086 |
}
|
|
|
1087 |
}
|
|
|
1088 |
|
|
|
1089 |
point = points;
|
|
|
1090 |
|
|
|
1091 |
for ( ; contour < contour_limit; contour++ )
|
|
|
1092 |
{
|
|
|
1093 |
AF_Point first_touched, last_touched;
|
|
|
1094 |
|
|
|
1095 |
|
|
|
1096 |
point = *contour;
|
|
|
1097 |
end_point = point->prev;
|
|
|
1098 |
first_point = point;
|
|
|
1099 |
|
|
|
1100 |
/* find first touched point */
|
|
|
1101 |
for (;;)
|
|
|
1102 |
{
|
|
|
1103 |
if ( point > end_point ) /* no touched point in contour */
|
|
|
1104 |
goto NextContour;
|
|
|
1105 |
|
|
|
1106 |
if ( point->flags & touch_flag )
|
|
|
1107 |
break;
|
|
|
1108 |
|
|
|
1109 |
point++;
|
|
|
1110 |
}
|
|
|
1111 |
|
|
|
1112 |
first_touched = point;
|
|
|
1113 |
last_touched = point;
|
|
|
1114 |
|
|
|
1115 |
for (;;)
|
|
|
1116 |
{
|
|
|
1117 |
FT_ASSERT( point <= end_point &&
|
|
|
1118 |
( point->flags & touch_flag ) != 0 );
|
|
|
1119 |
|
|
|
1120 |
/* skip any touched neighbours */
|
|
|
1121 |
while ( point < end_point &&
|
|
|
1122 |
( point[1].flags & touch_flag ) != 0 )
|
|
|
1123 |
point++;
|
|
|
1124 |
|
|
|
1125 |
last_touched = point;
|
|
|
1126 |
|
|
|
1127 |
/* find the next touched point, if any */
|
|
|
1128 |
point++;
|
|
|
1129 |
for (;;)
|
|
|
1130 |
{
|
|
|
1131 |
if ( point > end_point )
|
|
|
1132 |
goto EndContour;
|
|
|
1133 |
|
|
|
1134 |
if ( ( point->flags & touch_flag ) != 0 )
|
|
|
1135 |
break;
|
|
|
1136 |
|
|
|
1137 |
point++;
|
|
|
1138 |
}
|
|
|
1139 |
|
|
|
1140 |
/* interpolate between last_touched and point */
|
|
|
1141 |
af_iup_interp( last_touched + 1, point - 1,
|
|
|
1142 |
last_touched, point );
|
|
|
1143 |
}
|
|
|
1144 |
|
|
|
1145 |
EndContour:
|
|
|
1146 |
/* special case: only one point was touched */
|
|
|
1147 |
if ( last_touched == first_touched )
|
|
|
1148 |
af_iup_shift( first_point, end_point, first_touched );
|
|
|
1149 |
|
|
|
1150 |
else /* interpolate the last part */
|
|
|
1151 |
{
|
|
|
1152 |
if ( last_touched < end_point )
|
|
|
1153 |
af_iup_interp( last_touched + 1, end_point,
|
|
|
1154 |
last_touched, first_touched );
|
|
|
1155 |
|
|
|
1156 |
if ( first_touched > points )
|
|
|
1157 |
af_iup_interp( first_point, first_touched - 1,
|
|
|
1158 |
last_touched, first_touched );
|
|
|
1159 |
}
|
|
|
1160 |
|
|
|
1161 |
NextContour:
|
|
|
1162 |
;
|
|
|
1163 |
}
|
|
|
1164 |
|
|
|
1165 |
/* now save the interpolated values back to x/y */
|
|
|
1166 |
if ( dim == AF_DIMENSION_HORZ )
|
|
|
1167 |
{
|
|
|
1168 |
for ( point = points; point < point_limit; point++ )
|
|
|
1169 |
point->x = point->u;
|
|
|
1170 |
}
|
|
|
1171 |
else
|
|
|
1172 |
{
|
|
|
1173 |
for ( point = points; point < point_limit; point++ )
|
|
|
1174 |
point->y = point->u;
|
|
|
1175 |
}
|
|
|
1176 |
}
|
|
|
1177 |
|
|
|
1178 |
|
|
|
1179 |
#ifdef AF_CONFIG_OPTION_USE_WARPER
|
|
|
1180 |
|
|
|
1181 |
/* Apply (small) warp scale and warp delta for given dimension. */
|
|
|
1182 |
|
|
|
1183 |
FT_LOCAL_DEF( void )
|
|
|
1184 |
af_glyph_hints_scale_dim( AF_GlyphHints hints,
|
|
|
1185 |
AF_Dimension dim,
|
|
|
1186 |
FT_Fixed scale,
|
|
|
1187 |
FT_Pos delta )
|
|
|
1188 |
{
|
|
|
1189 |
AF_Point points = hints->points;
|
|
|
1190 |
AF_Point points_limit = points + hints->num_points;
|
|
|
1191 |
AF_Point point;
|
|
|
1192 |
|
|
|
1193 |
|
|
|
1194 |
if ( dim == AF_DIMENSION_HORZ )
|
|
|
1195 |
{
|
|
|
1196 |
for ( point = points; point < points_limit; point++ )
|
|
|
1197 |
point->x = FT_MulFix( point->fx, scale ) + delta;
|
|
|
1198 |
}
|
|
|
1199 |
else
|
|
|
1200 |
{
|
|
|
1201 |
for ( point = points; point < points_limit; point++ )
|
|
|
1202 |
point->y = FT_MulFix( point->fy, scale ) + delta;
|
|
|
1203 |
}
|
|
|
1204 |
}
|
|
|
1205 |
|
|
|
1206 |
#endif /* AF_CONFIG_OPTION_USE_WARPER */
|
|
|
1207 |
|
|
|
1208 |
/* END */
|