minhngoc25a
/
freetype2
mirror of git://git.savannah.gnu.org/freetype/freetype2.git
2
1
Fork 2
Code Issues 4 Releases Wiki Activity

Remove experimental auto-hinting 'warp' mode. 

This feature was always experimental, and probably nevery worked
properly. This patch completely removes it from the source code,
except for a documentation block describing it for historical
purpose.
This commit is contained in:
David Turner 2021-06-02 19:05:09 +02:00
parent 15e889800a
commit 2f11522a2a
16 changed files with 18 additions and 676 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
ChangeLog
View File

@ -1,3 +1,17 @@
2021-07-12 David Turner <david@freetype.org>
Remove experimental auto-hinting 'warp' mode.
This feature was always experimental, and probably nevery worked
properly. This patch completely removes it from the source code,
except for a documentation block describing it for historical
purpose.
* devel/ftoption.h: Remove AF_CONFIG_OPTION_USE_WARPER.
* include/freetype/config/ftoption.h: Remove AF_CONFIG_OPTION_USE_WARPER.
* include/freetype/ftdriver.h: Document 'warping' property as obsolete.
* src/autofit/*: Remove any warp mode related code.
2021-07-12 David Turner <david@freetype.org>
Remove experimental "Latin2" writing system (FT_OPTION_AUTOFIT2)

18
devel/ftoption.h
View File

@ -907,24 +907,6 @@ FT_BEGIN_HEADER
#endif
/**************************************************************************
*
* Compile 'autofit' module with warp hinting. The idea of the warping
* code is to slightly scale and shift a glyph within a single dimension so
* that as much of its segments are aligned (more or less) on the grid. To
* find out the optimal scaling and shifting value, various parameter
* combinations are tried and scored.
*
* You can switch warping on and off with the `warping` property of the
* auto-hinter (see file `ftdriver.h` for more information; by default it
* is switched off).
*
* This experimental option is not active if the rendering mode is
* `FT_RENDER_MODE_LIGHT`.
*/
#define AF_CONFIG_OPTION_USE_WARPER
/**************************************************************************
*
* Use TrueType-like size metrics for 'light' auto-hinting.

18
include/freetype/config/ftoption.h
View File

@ -909,24 +909,6 @@ FT_BEGIN_HEADER
#endif
/**************************************************************************
*
* Compile 'autofit' module with warp hinting. The idea of the warping
* code is to slightly scale and shift a glyph within a single dimension so
* that as much of its segments are aligned (more or less) on the grid. To
* find out the optimal scaling and shifting value, various parameter
* combinations are tried and scored.
*
* You can switch warping on and off with the `warping` property of the
* auto-hinter (see file `ftdriver.h` for more information; by default it
* is switched off).
*
* This experimental option is not active if the rendering mode is
* `FT_RENDER_MODE_LIGHT`.
*/
#define AF_CONFIG_OPTION_USE_WARPER
/**************************************************************************
*
* Use TrueType-like size metrics for 'light' auto-hinting.

38
include/freetype/ftdriver.h
View File

@ -1162,11 +1162,11 @@ FT_BEGIN_HEADER
* warping
*
* @description:
* **Experimental only**
* **Obsolete**
*
* If FreeType gets compiled with option `AF_CONFIG_OPTION_USE_WARPER` to
* activate the warp hinting code in the auto-hinter, this property
* switches warping on and off.
* This property was always experimental and probably never worked
* correctly. It was entirely removed from the FreeType 2 sources.
* This entry is only here for historical reference.
*
* Warping only works in 'normal' auto-hinting mode replacing it. The
* idea of the code is to slightly scale and shift a glyph along the
@ -1175,36 +1175,6 @@ FT_BEGIN_HEADER
* out a glyph's optimal scaling and shifting value, various parameter
* combinations are tried and scored.
*
* By default, warping is off.
*
* @note:
* This property can be used with @FT_Property_Get also.
*
* This property can be set via the `FREETYPE_PROPERTIES` environment
* variable (using values 1 and 0 for 'on' and 'off', respectively).
*
* The warping code can also change advance widths. Have a look at the
* `lsb_delta` and `rsb_delta` fields in the @FT_GlyphSlotRec structure
* for details on improving inter-glyph distances while rendering.
*
* Since warping is a global property of the auto-hinter it is best to
* change its value before rendering any face. Otherwise, you should
* reload all faces that get auto-hinted in 'normal' hinting mode.
*
* @example:
* This example shows how to switch on warping (omitting the error
* handling).
*
* ```
* FT_Library library;
* FT_Bool warping = 1;
*
*
* FT_Init_FreeType( &library );
*
* FT_Property_Set( library, "autofitter", "warping", &warping );
* ```
*
* @since:
* 2.6
*

35
src/autofit/afcjk.c
View File

@ -37,11 +37,6 @@
#include "aferrors.h"
#ifdef AF_CONFIG_OPTION_USE_WARPER
#include "afwarp.h"
#endif
/**************************************************************************
*
* The macro FT_COMPONENT is used in trace mode. It is an implicit
@ -1400,11 +1395,6 @@
/* compute flags depending on render mode, etc. */
mode = metrics->root.scaler.render_mode;
#if 0 /* AF_CONFIG_OPTION_USE_WARPER */
if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V )
metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL;
#endif
scaler_flags = hints->scaler_flags;
other_flags = 0;
@ -1433,12 +1423,6 @@
scaler_flags |= AF_SCALER_FLAG_NO_ADVANCE;
#ifdef AF_CONFIG_OPTION_USE_WARPER
/* get (global) warper flag */
if ( !metrics->root.globals->module->warping )
scaler_flags |= AF_SCALER_FLAG_NO_WARPER;
#endif
hints->scaler_flags = scaler_flags;
hints->other_flags = other_flags;
@ -2321,25 +2305,6 @@
if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) ||
( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) )
{
#ifdef AF_CONFIG_OPTION_USE_WARPER
if ( dim == AF_DIMENSION_HORZ &&
metrics->root.scaler.render_mode == FT_RENDER_MODE_NORMAL &&
AF_HINTS_DO_WARP( hints ) )
{
AF_WarperRec warper;
FT_Fixed scale;
FT_Pos delta;
af_warper_compute( &warper, hints, (AF_Dimension)dim,
&scale, &delta );
af_glyph_hints_scale_dim( hints, (AF_Dimension)dim,
scale, delta );
continue;
}
#endif /* AF_CONFIG_OPTION_USE_WARPER */
af_cjk_hint_edges( hints, (AF_Dimension)dim );
af_cjk_align_edge_points( hints, (AF_Dimension)dim );
af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim );

29
src/autofit/afhints.c
View File

@ -1688,33 +1688,4 @@
}
#ifdef AF_CONFIG_OPTION_USE_WARPER
/* Apply (small) warp scale and warp delta for given dimension. */
FT_LOCAL_DEF( void )
af_glyph_hints_scale_dim( AF_GlyphHints hints,
AF_Dimension dim,
FT_Fixed scale,
FT_Pos delta )
{
AF_Point points = hints->points;
AF_Point points_limit = points + hints->num_points;
AF_Point point;
if ( dim == AF_DIMENSION_HORZ )
{
for ( point = points; point < points_limit; point++ )
point->x = FT_MulFix( point->fx, scale ) + delta;
}
else
{
for ( point = points; point < points_limit; point++ )
point->y = FT_MulFix( point->fy, scale ) + delta;
}
}
#endif /* AF_CONFIG_OPTION_USE_WARPER */
/* END */

12
src/autofit/afhints.h
View File

@ -408,10 +408,6 @@ FT_BEGIN_HEADER
#define AF_HINTS_DO_ADVANCE( h ) \
!AF_HINTS_TEST_SCALER( h, AF_SCALER_FLAG_NO_ADVANCE )
#define AF_HINTS_DO_WARP( h ) \
!AF_HINTS_TEST_SCALER( h, AF_SCALER_FLAG_NO_WARPER )
FT_LOCAL( AF_Direction )
af_direction_compute( FT_Pos dx,
@ -459,14 +455,6 @@ FT_BEGIN_HEADER
af_glyph_hints_align_weak_points( AF_GlyphHints hints,
AF_Dimension dim );
#ifdef AF_CONFIG_OPTION_USE_WARPER
FT_LOCAL( void )
af_glyph_hints_scale_dim( AF_GlyphHints hints,
AF_Dimension dim,
FT_Fixed scale,
FT_Pos delta );
#endif
FT_LOCAL( void )
af_glyph_hints_done( AF_GlyphHints hints );

5
src/autofit/afindic.c
View File

@ -27,11 +27,6 @@
#include "aferrors.h"
#ifdef AF_CONFIG_OPTION_USE_WARPER
#include "afwarp.h"
#endif
static FT_Error
af_indic_metrics_init( AF_CJKMetrics metrics,
FT_Face face )

34
src/autofit/aflatin.c
View File

@ -24,11 +24,6 @@
#include "aferrors.h"
#ifdef AF_CONFIG_OPTION_USE_WARPER
#include "afwarp.h"
#endif
/**************************************************************************
*
* The macro FT_COMPONENT is used in trace mode. It is an implicit
@ -2636,11 +2631,6 @@
/* compute flags depending on render mode, etc. */
mode = metrics->root.scaler.render_mode;
#if 0 /* #ifdef AF_CONFIG_OPTION_USE_WARPER */
if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V )
metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL;
#endif
scaler_flags = hints->scaler_flags;
other_flags = 0;
@ -2678,12 +2668,6 @@
( face->style_flags & FT_STYLE_FLAG_ITALIC ) != 0 )
scaler_flags |= AF_SCALER_FLAG_NO_HORIZONTAL;
#ifdef AF_CONFIG_OPTION_USE_WARPER
/* get (global) warper flag */
if ( !metrics->root.globals->module->warping )
scaler_flags |= AF_SCALER_FLAG_NO_WARPER;
#endif
hints->scaler_flags = scaler_flags;
hints->other_flags = other_flags;
@ -3600,24 +3584,6 @@
/* grid-fit the outline */
for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
{
#ifdef AF_CONFIG_OPTION_USE_WARPER
if ( dim == AF_DIMENSION_HORZ &&
metrics->root.scaler.render_mode == FT_RENDER_MODE_NORMAL &&
AF_HINTS_DO_WARP( hints ) )
{
AF_WarperRec warper;
FT_Fixed scale;
FT_Pos delta;
af_warper_compute( &warper, hints, (AF_Dimension)dim,
&scale, &delta );
af_glyph_hints_scale_dim( hints, (AF_Dimension)dim,
scale, delta );
continue;
}
#endif /* AF_CONFIG_OPTION_USE_WARPER */
if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) ||
( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) )
{

46
src/autofit/afmodule.c
View File

@ -190,35 +190,6 @@
return error;
}
#ifdef AF_CONFIG_OPTION_USE_WARPER
else if ( !ft_strcmp( property_name, "warping" ) )
{
#ifdef FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES
if ( value_is_string )
{
const char* s = (const char*)value;
long w = ft_strtol( s, NULL, 10 );
if ( w == 0 )
module->warping = 0;
else if ( w == 1 )
module->warping = 1;
else
return FT_THROW( Invalid_Argument );
}
else
#endif
{
FT_Bool* warping = (FT_Bool*)value;
module->warping = *warping;
}
return error;
}
#endif /* AF_CONFIG_OPTION_USE_WARPER */
else if ( !ft_strcmp( property_name, "darkening-parameters" ) )
{
FT_Int* darken_params;
@ -322,9 +293,6 @@
AF_Module module = (AF_Module)ft_module;
FT_UInt fallback_style = module->fallback_style;
FT_UInt default_script = module->default_script;
#ifdef AF_CONFIG_OPTION_USE_WARPER
FT_Bool warping = module->warping;
#endif
if ( !ft_strcmp( property_name, "glyph-to-script-map" ) )
@ -371,17 +339,6 @@
return error;
}
#ifdef AF_CONFIG_OPTION_USE_WARPER
else if ( !ft_strcmp( property_name, "warping" ) )
{
FT_Bool* val = (FT_Bool*)value;
*val = warping;
return error;
}
#endif /* AF_CONFIG_OPTION_USE_WARPER */
else if ( !ft_strcmp( property_name, "darkening-parameters" ) )
{
FT_Int* darken_params = module->darken_params;
@ -447,9 +404,6 @@
module->fallback_style = AF_STYLE_FALLBACK;
module->default_script = AF_SCRIPT_DEFAULT;
#ifdef AF_CONFIG_OPTION_USE_WARPER
module->warping = 0;
#endif
module->no_stem_darkening = TRUE;
module->darken_params[0] = CFF_CONFIG_OPTION_DARKENING_PARAMETER_X1;

3
src/autofit/afmodule.h
View File

@ -37,9 +37,6 @@ FT_BEGIN_HEADER
FT_UInt fallback_style;
FT_UInt default_script;
#ifdef AF_CONFIG_OPTION_USE_WARPER
FT_Bool warping;
#endif
FT_Bool no_stem_darkening;
FT_Int darken_params[8];

1
src/autofit/aftypes.h
View File

@ -172,7 +172,6 @@ extern void* _af_debug_hints;
#define AF_SCALER_FLAG_NO_HORIZONTAL 1U /* disable horizontal hinting */
#define AF_SCALER_FLAG_NO_VERTICAL 2U /* disable vertical hinting */
#define AF_SCALER_FLAG_NO_ADVANCE 4U /* disable advance hinting */
#define AF_SCALER_FLAG_NO_WARPER 8U /* disable warper */
typedef struct AF_ScalerRec_

373
src/autofit/afwarp.c
View File

@ -1,373 +0,0 @@
/****************************************************************************
*
* afwarp.c
*
* Auto-fitter warping algorithm (body).
*
* Copyright (C) 2006-2021 by
* David Turner, Robert Wilhelm, and Werner Lemberg.
*
* This file is part of the FreeType project, and may only be used,
* modified, and distributed under the terms of the FreeType project
* license, LICENSE.TXT. By continuing to use, modify, or distribute
* this file you indicate that you have read the license and
* understand and accept it fully.
*
*/
/*
* The idea of the warping code is to slightly scale and shift a glyph
* within a single dimension so that as much of its segments are aligned
* (more or less) on the grid. To find out the optimal scaling and
* shifting value, various parameter combinations are tried and scored.
*/
#include "afwarp.h"
#ifdef AF_CONFIG_OPTION_USE_WARPER
/**************************************************************************
*
* The macro FT_COMPONENT is used in trace mode. It is an implicit
* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
* messages during execution.
*/
#undef FT_COMPONENT
#define FT_COMPONENT afwarp
/* The weights cover the range 0/64 - 63/64 of a pixel. Obviously, */
/* values around a half pixel (which means exactly between two grid */
/* lines) gets the worst weight. */
#if 1
static const AF_WarpScore
af_warper_weights[64] =
{
35, 32, 30, 25, 20, 15, 12, 10, 5, 1, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, -1, -2, -5, -8,-10,-10,-20,-20,-30,-30,
-30,-30,-20,-20,-10,-10, -8, -5, -2, -1, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 1, 5, 10, 12, 15, 20, 25, 30, 32,
};
#else
static const AF_WarpScore
af_warper_weights[64] =
{
30, 20, 10, 5, 4, 4, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, -1, -2, -2, -5, -5,-10,-10,-15,-20,
-20,-15,-15,-10,-10, -5, -5, -2, -2, -1, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 4, 5, 10, 20,
};
#endif
/* Score segments for a given `scale' and `delta' in the range */
/* `xx1' to `xx2', and store the best result in `warper'. If */
/* the new best score is equal to the old one, prefer the */
/* value with a smaller distortion (around `base_distort'). */
static void
af_warper_compute_line_best( AF_Warper warper,
FT_Fixed scale,
FT_Pos delta,
FT_Pos xx1,
FT_Pos xx2,
AF_WarpScore base_distort,
AF_Segment segments,
FT_Int num_segments )
{
FT_Int idx_min, idx_max, idx0;
FT_Int nn;
AF_WarpScore scores[65];
for ( nn = 0; nn < 65; nn++ )
scores[nn] = 0;
idx0 = xx1 - warper->t1;
/* compute minimum and maximum indices */
{
FT_Pos xx1min = warper->x1min;
FT_Pos xx1max = warper->x1max;
FT_Pos w = xx2 - xx1;
if ( xx1min + w < warper->x2min )
xx1min = warper->x2min - w;
if ( xx1max + w > warper->x2max )
xx1max = warper->x2max - w;
idx_min = xx1min - warper->t1;
idx_max = xx1max - warper->t1;
if ( idx_min < 0 || idx_min > idx_max || idx_max > 64 )
{
FT_TRACE5(( "invalid indices:\n" ));
FT_TRACE5(( " min=%d max=%d, xx1=%ld xx2=%ld,\n",
idx_min, idx_max, xx1, xx2 ));
FT_TRACE5(( " x1min=%ld x1max=%ld, x2min=%ld x2max=%ld\n",
warper->x1min, warper->x1max,
warper->x2min, warper->x2max ));
return;
}
}
for ( nn = 0; nn < num_segments; nn++ )
{
FT_Pos len = segments[nn].max_coord - segments[nn].min_coord;
FT_Pos y0 = FT_MulFix( segments[nn].pos, scale ) + delta;
FT_Pos y = y0 + ( idx_min - idx0 );
FT_Int idx;
/* score the length of the segments for the given range */
for ( idx = idx_min; idx <= idx_max; idx++, y++ )
scores[idx] += af_warper_weights[y & 63] * len;
}
/* find best score */
{
FT_Int idx;
for ( idx = idx_min; idx <= idx_max; idx++ )
{
AF_WarpScore score = scores[idx];
AF_WarpScore distort = base_distort + ( idx - idx0 );
if ( score > warper->best_score ||
( score == warper->best_score &&
distort < warper->best_distort ) )
{
warper->best_score = score;
warper->best_distort = distort;
warper->best_scale = scale;
warper->best_delta = delta + ( idx - idx0 );
}
}
}
}
/* Compute optimal scaling and delta values for a given glyph and */
/* dimension. */
FT_LOCAL_DEF( void )
af_warper_compute( AF_Warper warper,
AF_GlyphHints hints,
AF_Dimension dim,
FT_Fixed *a_scale,
FT_Pos *a_delta )
{
AF_AxisHints axis;
AF_Point points;
FT_Fixed org_scale;
FT_Pos org_delta;
FT_Int nn, num_points, num_segments;
FT_Int X1, X2;
FT_Int w;
AF_WarpScore base_distort;
AF_Segment segments;
/* get original scaling transformation */
if ( dim == AF_DIMENSION_VERT )
{
org_scale = hints->y_scale;
org_delta = hints->y_delta;
}
else
{
org_scale = hints->x_scale;
org_delta = hints->x_delta;
}
warper->best_scale = org_scale;
warper->best_delta = org_delta;
warper->best_score = FT_INT_MIN;
warper->best_distort = 0;
axis = &hints->axis[dim];
segments = axis->segments;
num_segments = axis->num_segments;
points = hints->points;
num_points = hints->num_points;
*a_scale = org_scale;
*a_delta = org_delta;
/* get X1 and X2, minimum and maximum in original coordinates */
if ( num_segments < 1 )
return;
#if 1
X1 = X2 = points[0].fx;
for ( nn = 1; nn < num_points; nn++ )
{
FT_Int X = points[nn].fx;
if ( X < X1 )
X1 = X;
if ( X > X2 )
X2 = X;
}
#else
X1 = X2 = segments[0].pos;
for ( nn = 1; nn < num_segments; nn++ )
{
FT_Int X = segments[nn].pos;
if ( X < X1 )
X1 = X;
if ( X > X2 )
X2 = X;
}
#endif
if ( X1 >= X2 )
return;
warper->x1 = FT_MulFix( X1, org_scale ) + org_delta;
warper->x2 = FT_MulFix( X2, org_scale ) + org_delta;
warper->t1 = AF_WARPER_FLOOR( warper->x1 );
warper->t2 = AF_WARPER_CEIL( warper->x2 );
/* examine a half pixel wide range around the maximum coordinates */
warper->x1min = warper->x1 & ~31;
warper->x1max = warper->x1min + 32;
warper->x2min = warper->x2 & ~31;
warper->x2max = warper->x2min + 32;
if ( warper->x1max > warper->x2 )
warper->x1max = warper->x2;
if ( warper->x2min < warper->x1 )
warper->x2min = warper->x1;
warper->w0 = warper->x2 - warper->x1;
if ( warper->w0 <= 64 )
{
warper->x1max = warper->x1;
warper->x2min = warper->x2;
}
/* examine (at most) a pixel wide range around the natural width */
warper->wmin = warper->x2min - warper->x1max;
warper->wmax = warper->x2max - warper->x1min;
#if 1
/* some heuristics to reduce the number of widths to be examined */
{
int margin = 16;
if ( warper->w0 <= 128 )
{
margin = 8;
if ( warper->w0 <= 96 )
margin = 4;
}
if ( warper->wmin < warper->w0 - margin )
warper->wmin = warper->w0 - margin;
if ( warper->wmax > warper->w0 + margin )
warper->wmax = warper->w0 + margin;
}
if ( warper->wmin < warper->w0 * 3 / 4 )
warper->wmin = warper->w0 * 3 / 4;
if ( warper->wmax > warper->w0 * 5 / 4 )
warper->wmax = warper->w0 * 5 / 4;
#else
/* no scaling, just translation */
warper->wmin = warper->wmax = warper->w0;
#endif
for ( w = warper->wmin; w <= warper->wmax; w++ )
{
FT_Fixed new_scale;
FT_Pos new_delta;
FT_Pos xx1, xx2;
/* compute min and max positions for given width, */
/* assuring that they stay within the coordinate ranges */
xx1 = warper->x1;
xx2 = warper->x2;
if ( w >= warper->w0 )
{
xx1 -= w - warper->w0;
if ( xx1 < warper->x1min )
{
xx2 += warper->x1min - xx1;
xx1 = warper->x1min;
}
}
else
{
xx1 -= w - warper->w0;
if ( xx1 > warper->x1max )
{
xx2 -= xx1 - warper->x1max;
xx1 = warper->x1max;
}
}
if ( xx1 < warper->x1 )
base_distort = warper->x1 - xx1;
else
base_distort = xx1 - warper->x1;
if ( xx2 < warper->x2 )
base_distort += warper->x2 - xx2;
else
base_distort += xx2 - warper->x2;
/* give base distortion a greater weight while scoring */
base_distort *= 10;
new_scale = org_scale + FT_DivFix( w - warper->w0, X2 - X1 );
new_delta = xx1 - FT_MulFix( X1, new_scale );
af_warper_compute_line_best( warper, new_scale, new_delta, xx1, xx2,
base_distort,
segments, num_segments );
}
{
FT_Fixed best_scale = warper->best_scale;
FT_Pos best_delta = warper->best_delta;
hints->xmin_delta = FT_MulFix( X1, best_scale - org_scale )
+ best_delta;
hints->xmax_delta = FT_MulFix( X2, best_scale - org_scale )
+ best_delta;
*a_scale = best_scale;
*a_delta = best_delta;
}
}
#else /* !AF_CONFIG_OPTION_USE_WARPER */
/* ANSI C doesn't like empty source files */
typedef int _af_warp_dummy;
#endif /* !AF_CONFIG_OPTION_USE_WARPER */
/* END */

66
src/autofit/afwarp.h
View File

@ -1,66 +0,0 @@
/****************************************************************************
*
* afwarp.h
*
* Auto-fitter warping algorithm (specification).
*
* Copyright (C) 2006-2021 by
* David Turner, Robert Wilhelm, and Werner Lemberg.
*
* This file is part of the FreeType project, and may only be used,
* modified, and distributed under the terms of the FreeType project
* license, LICENSE.TXT. By continuing to use, modify, or distribute
* this file you indicate that you have read the license and
* understand and accept it fully.
*
*/
#ifndef AFWARP_H_
#define AFWARP_H_
#include "afhints.h"
FT_BEGIN_HEADER
#define AF_WARPER_SCALE
#define AF_WARPER_FLOOR( x ) ( (x) & ~FT_TYPEOF( x )63 )
#define AF_WARPER_CEIL( x ) AF_WARPER_FLOOR( (x) + 63 )
typedef FT_Int32 AF_WarpScore;
typedef struct AF_WarperRec_
{
FT_Pos x1, x2;
FT_Pos t1, t2;
FT_Pos x1min, x1max;
FT_Pos x2min, x2max;
FT_Pos w0, wmin, wmax;
FT_Fixed best_scale;
FT_Pos best_delta;
AF_WarpScore best_score;
AF_WarpScore best_distort;
} AF_WarperRec, *AF_Warper;
#ifdef AF_CONFIG_OPTION_USE_WARPER
FT_LOCAL( void )
af_warper_compute( AF_Warper warper,
AF_GlyphHints hints,
AF_Dimension dim,
FT_Fixed *a_scale,
FT_Pos *a_delta );
#endif
FT_END_HEADER
#endif /* AFWARP_H_ */
/* END */

1
src/autofit/autofit.c
View File

@ -30,7 +30,6 @@
#include "afmodule.c"
#include "afranges.c"
#include "afshaper.c"
#include "afwarp.c"
/* END */

1
src/autofit/rules.mk
View File

@ -40,7 +40,6 @@ AUTOF_DRV_SRC := $(AUTOF_DIR)/afangles.c \
$(AUTOF_DIR)/afmodule.c \
$(AUTOF_DIR)/afranges.c \
$(AUTOF_DIR)/afshaper.c \
$(AUTOF_DIR)/afwarp.c
# AUTOF driver headers
#