/***************************************************************************/ | |
/* */ | |
/* ttgload.c */ | |
/* */ | |
/* TrueType Glyph Loader (body). */ | |
/* */ | |
/* Copyright 1996-2015 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. */ | |
/* */ | |
/***************************************************************************/ | |
#include <ft2build.h> | |
#include FT_INTERNAL_DEBUG_H | |
#include FT_INTERNAL_CALC_H | |
#include FT_INTERNAL_STREAM_H | |
#include FT_INTERNAL_SFNT_H | |
#include FT_TRUETYPE_TAGS_H | |
#include FT_OUTLINE_H | |
#include FT_TRUETYPE_DRIVER_H | |
#include FT_LIST_H | |
#include "ttgload.h" | |
#include "ttpload.h" | |
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT | |
#include "ttgxvar.h" | |
#endif | |
#include "tterrors.h" | |
#include "ttsubpix.h" | |
/*************************************************************************/ | |
/* */ | |
/* 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 trace_ttgload | |
/*************************************************************************/ | |
/* */ | |
/* Composite glyph flags. */ | |
/* */ | |
#define ARGS_ARE_WORDS 0x0001 | |
#define ARGS_ARE_XY_VALUES 0x0002 | |
#define ROUND_XY_TO_GRID 0x0004 | |
#define WE_HAVE_A_SCALE 0x0008 | |
/* reserved 0x0010 */ | |
#define MORE_COMPONENTS 0x0020 | |
#define WE_HAVE_AN_XY_SCALE 0x0040 | |
#define WE_HAVE_A_2X2 0x0080 | |
#define WE_HAVE_INSTR 0x0100 | |
#define USE_MY_METRICS 0x0200 | |
#define OVERLAP_COMPOUND 0x0400 | |
#define SCALED_COMPONENT_OFFSET 0x0800 | |
#define UNSCALED_COMPONENT_OFFSET 0x1000 | |
/*************************************************************************/ | |
/* */ | |
/* Return the horizontal metrics in font units for a given glyph. */ | |
/* */ | |
FT_LOCAL_DEF( void ) | |
TT_Get_HMetrics( TT_Face face, | |
FT_UInt idx, | |
FT_Short* lsb, | |
FT_UShort* aw ) | |
{ | |
( (SFNT_Service)face->sfnt )->get_metrics( face, 0, idx, lsb, aw ); | |
FT_TRACE5(( " advance width (font units): %d\n", *aw )); | |
FT_TRACE5(( " left side bearing (font units): %d\n", *lsb )); | |
} | |
/*************************************************************************/ | |
/* */ | |
/* Return the vertical metrics in font units for a given glyph. */ | |
/* See macro `TT_LOADER_SET_PP' below for explanations. */ | |
/* */ | |
FT_LOCAL_DEF( void ) | |
TT_Get_VMetrics( TT_Face face, | |
FT_UInt idx, | |
FT_Pos yMax, | |
FT_Short* tsb, | |
FT_UShort* ah ) | |
{ | |
if ( face->vertical_info ) | |
( (SFNT_Service)face->sfnt )->get_metrics( face, 1, idx, tsb, ah ); | |
else if ( face->os2.version != 0xFFFFU ) | |
{ | |
*tsb = (FT_Short)( face->os2.sTypoAscender - yMax ); | |
*ah = (FT_UShort)FT_ABS( face->os2.sTypoAscender - | |
face->os2.sTypoDescender ); | |
} | |
else | |
{ | |
*tsb = (FT_Short)( face->horizontal.Ascender - yMax ); | |
*ah = (FT_UShort)FT_ABS( face->horizontal.Ascender - | |
face->horizontal.Descender ); | |
} | |
FT_TRACE5(( " advance height (font units): %d\n", *ah )); | |
FT_TRACE5(( " top side bearing (font units): %d\n", *tsb )); | |
} | |
static FT_Error | |
tt_get_metrics( TT_Loader loader, | |
FT_UInt glyph_index ) | |
{ | |
TT_Face face = loader->face; | |
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING | |
TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face ); | |
#endif | |
FT_Error error; | |
FT_Stream stream = loader->stream; | |
FT_Short left_bearing = 0, top_bearing = 0; | |
FT_UShort advance_width = 0, advance_height = 0; | |
/* we must preserve the stream position */ | |
/* (which gets altered by the metrics functions) */ | |
FT_ULong pos = FT_STREAM_POS(); | |
TT_Get_HMetrics( face, glyph_index, | |
&left_bearing, | |
&advance_width ); | |
TT_Get_VMetrics( face, glyph_index, | |
loader->bbox.yMax, | |
&top_bearing, | |
&advance_height ); | |
if ( FT_STREAM_SEEK( pos ) ) | |
return error; | |
loader->left_bearing = left_bearing; | |
loader->advance = advance_width; | |
loader->top_bearing = top_bearing; | |
loader->vadvance = advance_height; | |
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING | |
if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 && | |
loader->exec ) | |
{ | |
loader->exec->sph_tweak_flags = 0; | |
/* This may not be the right place for this, but it works... */ | |
/* Note that we have to unconditionally load the tweaks since */ | |
/* it is possible that glyphs individually switch ClearType's */ | |
/* backwards compatibility mode on and off. */ | |
sph_set_tweaks( loader, glyph_index ); | |
} | |
#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ | |
if ( !loader->linear_def ) | |
{ | |
loader->linear_def = 1; | |
loader->linear = advance_width; | |
} | |
return FT_Err_Ok; | |
} | |
#ifdef FT_CONFIG_OPTION_INCREMENTAL | |
static void | |
tt_get_metrics_incr_overrides( TT_Loader loader, | |
FT_UInt glyph_index ) | |
{ | |
TT_Face face = loader->face; | |
FT_Short left_bearing = 0, top_bearing = 0; | |
FT_UShort advance_width = 0, advance_height = 0; | |
/* If this is an incrementally loaded font check whether there are */ | |
/* overriding metrics for this glyph. */ | |
if ( face->root.internal->incremental_interface && | |
face->root.internal->incremental_interface->funcs->get_glyph_metrics ) | |
{ | |
FT_Incremental_MetricsRec metrics; | |
FT_Error error; | |
metrics.bearing_x = loader->left_bearing; | |
metrics.bearing_y = 0; | |
metrics.advance = loader->advance; | |
metrics.advance_v = 0; | |
error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( | |
face->root.internal->incremental_interface->object, | |
glyph_index, FALSE, &metrics ); | |
if ( error ) | |
goto Exit; | |
left_bearing = (FT_Short)metrics.bearing_x; | |
advance_width = (FT_UShort)metrics.advance; | |
#if 0 | |
/* GWW: Do I do the same for vertical metrics? */ | |
metrics.bearing_x = 0; | |
metrics.bearing_y = loader->top_bearing; | |
metrics.advance = loader->vadvance; | |
error = face->root.internal->incremental_interface->funcs->get_glyph_metrics( | |
face->root.internal->incremental_interface->object, | |
glyph_index, TRUE, &metrics ); | |
if ( error ) | |
goto Exit; | |
top_bearing = (FT_Short)metrics.bearing_y; | |
advance_height = (FT_UShort)metrics.advance; | |
#endif /* 0 */ | |
loader->left_bearing = left_bearing; | |
loader->advance = advance_width; | |
loader->top_bearing = top_bearing; | |
loader->vadvance = advance_height; | |
if ( !loader->linear_def ) | |
{ | |
loader->linear_def = 1; | |
loader->linear = advance_width; | |
} | |
} | |
Exit: | |
return; | |
} | |
#endif /* FT_CONFIG_OPTION_INCREMENTAL */ | |
/*************************************************************************/ | |
/* */ | |
/* The following functions are used by default with TrueType fonts. */ | |
/* However, they can be replaced by alternatives if we need to support */ | |
/* TrueType-compressed formats (like MicroType) in the future. */ | |
/* */ | |
/*************************************************************************/ | |
FT_CALLBACK_DEF( FT_Error ) | |
TT_Access_Glyph_Frame( TT_Loader loader, | |
FT_UInt glyph_index, | |
FT_ULong offset, | |
FT_UInt byte_count ) | |
{ | |
FT_Error error; | |
FT_Stream stream = loader->stream; | |
/* for non-debug mode */ | |
FT_UNUSED( glyph_index ); | |
FT_TRACE4(( "Glyph %ld\n", glyph_index )); | |
/* the following line sets the `error' variable through macros! */ | |
if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( byte_count ) ) | |
return error; | |
loader->cursor = stream->cursor; | |
loader->limit = stream->limit; | |
return FT_Err_Ok; | |
} | |
FT_CALLBACK_DEF( void ) | |
TT_Forget_Glyph_Frame( TT_Loader loader ) | |
{ | |
FT_Stream stream = loader->stream; | |
FT_FRAME_EXIT(); | |
} | |
FT_CALLBACK_DEF( FT_Error ) | |
TT_Load_Glyph_Header( TT_Loader loader ) | |
{ | |
FT_Byte* p = loader->cursor; | |
FT_Byte* limit = loader->limit; | |
if ( p + 10 > limit ) | |
return FT_THROW( Invalid_Outline ); | |
loader->n_contours = FT_NEXT_SHORT( p ); | |
loader->bbox.xMin = FT_NEXT_SHORT( p ); | |
loader->bbox.yMin = FT_NEXT_SHORT( p ); | |
loader->bbox.xMax = FT_NEXT_SHORT( p ); | |
loader->bbox.yMax = FT_NEXT_SHORT( p ); | |
FT_TRACE5(( " # of contours: %d\n", loader->n_contours )); | |
FT_TRACE5(( " xMin: %4d xMax: %4d\n", loader->bbox.xMin, | |
loader->bbox.xMax )); | |
FT_TRACE5(( " yMin: %4d yMax: %4d\n", loader->bbox.yMin, | |
loader->bbox.yMax )); | |
loader->cursor = p; | |
return FT_Err_Ok; | |
} | |
FT_CALLBACK_DEF( FT_Error ) | |
TT_Load_Simple_Glyph( TT_Loader load ) | |
{ | |
FT_Error error; | |
FT_Byte* p = load->cursor; | |
FT_Byte* limit = load->limit; | |
FT_GlyphLoader gloader = load->gloader; | |
FT_Int n_contours = load->n_contours; | |
FT_Outline* outline; | |
FT_UShort n_ins; | |
FT_Int n_points; | |
FT_ULong tmp; | |
FT_Byte *flag, *flag_limit; | |
FT_Byte c, count; | |
FT_Vector *vec, *vec_limit; | |
FT_Pos x; | |
FT_Short *cont, *cont_limit, prev_cont; | |
FT_Int xy_size = 0; | |
/* check that we can add the contours to the glyph */ | |
error = FT_GLYPHLOADER_CHECK_POINTS( gloader, 0, n_contours ); | |
if ( error ) | |
goto Fail; | |
/* reading the contours' endpoints & number of points */ | |
cont = gloader->current.outline.contours; | |
cont_limit = cont + n_contours; | |
/* check space for contours array + instructions count */ | |
if ( n_contours >= 0xFFF || p + ( n_contours + 1 ) * 2 > limit ) | |
goto Invalid_Outline; | |
prev_cont = FT_NEXT_SHORT( p ); | |
if ( n_contours > 0 ) | |
cont[0] = prev_cont; | |
if ( prev_cont < 0 ) | |
goto Invalid_Outline; | |
for ( cont++; cont < cont_limit; cont++ ) | |
{ | |
cont[0] = FT_NEXT_SHORT( p ); | |
if ( cont[0] <= prev_cont ) | |
{ | |
/* unordered contours: this is invalid */ | |
goto Invalid_Outline; | |
} | |
prev_cont = cont[0]; | |
} | |
n_points = 0; | |
if ( n_contours > 0 ) | |
{ | |
n_points = cont[-1] + 1; | |
if ( n_points < 0 ) | |
goto Invalid_Outline; | |
} | |
/* note that we will add four phantom points later */ | |
error = FT_GLYPHLOADER_CHECK_POINTS( gloader, n_points + 4, 0 ); | |
if ( error ) | |
goto Fail; | |
/* reading the bytecode instructions */ | |
load->glyph->control_len = 0; | |
load->glyph->control_data = NULL; | |
if ( p + 2 > limit ) | |
goto Invalid_Outline; | |
n_ins = FT_NEXT_USHORT( p ); | |
FT_TRACE5(( " Instructions size: %u\n", n_ins )); | |
/* check it */ | |
if ( ( limit - p ) < n_ins ) | |
{ | |
FT_TRACE0(( "TT_Load_Simple_Glyph: instruction count mismatch\n" )); | |
error = FT_THROW( Too_Many_Hints ); | |
goto Fail; | |
} | |
#ifdef TT_USE_BYTECODE_INTERPRETER | |
if ( IS_HINTED( load->load_flags ) ) | |
{ | |
/* we don't trust `maxSizeOfInstructions' in the `maxp' table */ | |
/* and thus update the bytecode array size by ourselves */ | |
tmp = load->exec->glyphSize; | |
error = Update_Max( load->exec->memory, | |
&tmp, | |
sizeof ( FT_Byte ), | |
(void*)&load->exec->glyphIns, | |
n_ins ); | |
load->exec->glyphSize = (FT_UShort)tmp; | |
if ( error ) | |
return error; | |
load->glyph->control_len = n_ins; | |
load->glyph->control_data = load->exec->glyphIns; | |
FT_MEM_COPY( load->exec->glyphIns, p, (FT_Long)n_ins ); | |
} | |
#endif /* TT_USE_BYTECODE_INTERPRETER */ | |
p += n_ins; | |
outline = &gloader->current.outline; | |
/* reading the point tags */ | |
flag = (FT_Byte*)outline->tags; | |
flag_limit = flag + n_points; | |
FT_ASSERT( flag != NULL ); | |
while ( flag < flag_limit ) | |
{ | |
if ( p + 1 > limit ) | |
goto Invalid_Outline; | |
*flag++ = c = FT_NEXT_BYTE( p ); | |
if ( c & 8 ) | |
{ | |
if ( p + 1 > limit ) | |
goto Invalid_Outline; | |
count = FT_NEXT_BYTE( p ); | |
if ( flag + (FT_Int)count > flag_limit ) | |
goto Invalid_Outline; | |
for ( ; count > 0; count-- ) | |
*flag++ = c; | |
} | |
} | |
/* reading the X coordinates */ | |
vec = outline->points; | |
vec_limit = vec + n_points; | |
flag = (FT_Byte*)outline->tags; | |
x = 0; | |
if ( p + xy_size > limit ) | |
goto Invalid_Outline; | |
for ( ; vec < vec_limit; vec++, flag++ ) | |
{ | |
FT_Pos y = 0; | |
FT_Byte f = *flag; | |
if ( f & 2 ) | |
{ | |
if ( p + 1 > limit ) | |
goto Invalid_Outline; | |
y = (FT_Pos)FT_NEXT_BYTE( p ); | |
if ( ( f & 16 ) == 0 ) | |
y = -y; | |
} | |
else if ( ( f & 16 ) == 0 ) | |
{ | |
if ( p + 2 > limit ) | |
goto Invalid_Outline; | |
y = (FT_Pos)FT_NEXT_SHORT( p ); | |
} | |
x += y; | |
vec->x = x; | |
/* the cast is for stupid compilers */ | |
*flag = (FT_Byte)( f & ~( 2 | 16 ) ); | |
} | |
/* reading the Y coordinates */ | |
vec = gloader->current.outline.points; | |
vec_limit = vec + n_points; | |
flag = (FT_Byte*)outline->tags; | |
x = 0; | |
for ( ; vec < vec_limit; vec++, flag++ ) | |
{ | |
FT_Pos y = 0; | |
FT_Byte f = *flag; | |
if ( f & 4 ) | |
{ | |
if ( p + 1 > limit ) | |
goto Invalid_Outline; | |
y = (FT_Pos)FT_NEXT_BYTE( p ); | |
if ( ( f & 32 ) == 0 ) | |
y = -y; | |
} | |
else if ( ( f & 32 ) == 0 ) | |
{ | |
if ( p + 2 > limit ) | |
goto Invalid_Outline; | |
y = (FT_Pos)FT_NEXT_SHORT( p ); | |
} | |
x += y; | |
vec->y = x; | |
/* the cast is for stupid compilers */ | |
*flag = (FT_Byte)( f & FT_CURVE_TAG_ON ); | |
} | |
outline->n_points = (FT_Short)n_points; | |
outline->n_contours = (FT_Short)n_contours; | |
load->cursor = p; | |
Fail: | |
return error; | |
Invalid_Outline: | |
error = FT_THROW( Invalid_Outline ); | |
goto Fail; | |
} | |
FT_CALLBACK_DEF( FT_Error ) | |
TT_Load_Composite_Glyph( TT_Loader loader ) | |
{ | |
FT_Error error; | |
FT_Byte* p = loader->cursor; | |
FT_Byte* limit = loader->limit; | |
FT_GlyphLoader gloader = loader->gloader; | |
FT_SubGlyph subglyph; | |
FT_UInt num_subglyphs; | |
num_subglyphs = 0; | |
do | |
{ | |
FT_Fixed xx, xy, yy, yx; | |
FT_UInt count; | |
/* check that we can load a new subglyph */ | |
error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs + 1 ); | |
if ( error ) | |
goto Fail; | |
/* check space */ | |
if ( p + 4 > limit ) | |
goto Invalid_Composite; | |
subglyph = gloader->current.subglyphs + num_subglyphs; | |
subglyph->arg1 = subglyph->arg2 = 0; | |
subglyph->flags = FT_NEXT_USHORT( p ); | |
subglyph->index = FT_NEXT_USHORT( p ); | |
/* check space */ | |
count = 2; | |
if ( subglyph->flags & ARGS_ARE_WORDS ) | |
count += 2; | |
if ( subglyph->flags & WE_HAVE_A_SCALE ) | |
count += 2; | |
else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) | |
count += 4; | |
else if ( subglyph->flags & WE_HAVE_A_2X2 ) | |
count += 8; | |
if ( p + count > limit ) | |
goto Invalid_Composite; | |
/* read arguments */ | |
if ( subglyph->flags & ARGS_ARE_XY_VALUES ) | |
{ | |
if ( subglyph->flags & ARGS_ARE_WORDS ) | |
{ | |
subglyph->arg1 = FT_NEXT_SHORT( p ); | |
subglyph->arg2 = FT_NEXT_SHORT( p ); | |
} | |
else | |
{ | |
subglyph->arg1 = FT_NEXT_CHAR( p ); | |
subglyph->arg2 = FT_NEXT_CHAR( p ); | |
} | |
} | |
else | |
{ | |
if ( subglyph->flags & ARGS_ARE_WORDS ) | |
{ | |
subglyph->arg1 = (FT_Int)FT_NEXT_USHORT( p ); | |
subglyph->arg2 = (FT_Int)FT_NEXT_USHORT( p ); | |
} | |
else | |
{ | |
subglyph->arg1 = (FT_Int)FT_NEXT_BYTE( p ); | |
subglyph->arg2 = (FT_Int)FT_NEXT_BYTE( p ); | |
} | |
} | |
/* read transform */ | |
xx = yy = 0x10000L; | |
xy = yx = 0; | |
if ( subglyph->flags & WE_HAVE_A_SCALE ) | |
{ | |
xx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4; | |
yy = xx; | |
} | |
else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE ) | |
{ | |
xx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4; | |
yy = (FT_Fixed)FT_NEXT_SHORT( p ) * 4; | |
} | |
else if ( subglyph->flags & WE_HAVE_A_2X2 ) | |
{ | |
xx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4; | |
yx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4; | |
xy = (FT_Fixed)FT_NEXT_SHORT( p ) * 4; | |
yy = (FT_Fixed)FT_NEXT_SHORT( p ) * 4; | |
} | |
subglyph->transform.xx = xx; | |
subglyph->transform.xy = xy; | |
subglyph->transform.yx = yx; | |
subglyph->transform.yy = yy; | |
num_subglyphs++; | |
} while ( subglyph->flags & MORE_COMPONENTS ); | |
gloader->current.num_subglyphs = num_subglyphs; | |
FT_TRACE5(( " %d components\n", num_subglyphs )); | |
#ifdef TT_USE_BYTECODE_INTERPRETER | |
{ | |
FT_Stream stream = loader->stream; | |
/* we must undo the FT_FRAME_ENTER in order to point */ | |
/* to the composite instructions, if we find some. */ | |
/* We will process them later. */ | |
/* */ | |
loader->ins_pos = (FT_ULong)( FT_STREAM_POS() + | |
p - limit ); | |
} | |
#endif | |
loader->cursor = p; | |
Fail: | |
return error; | |
Invalid_Composite: | |
error = FT_THROW( Invalid_Composite ); | |
goto Fail; | |
} | |
FT_LOCAL_DEF( void ) | |
TT_Init_Glyph_Loading( TT_Face face ) | |
{ | |
face->access_glyph_frame = TT_Access_Glyph_Frame; | |
face->read_glyph_header = TT_Load_Glyph_Header; | |
face->read_simple_glyph = TT_Load_Simple_Glyph; | |
face->read_composite_glyph = TT_Load_Composite_Glyph; | |
face->forget_glyph_frame = TT_Forget_Glyph_Frame; | |
} | |
static void | |
tt_prepare_zone( TT_GlyphZone zone, | |
FT_GlyphLoad load, | |
FT_UInt start_point, | |
FT_UInt start_contour ) | |
{ | |
zone->n_points = (FT_UShort)load->outline.n_points - | |
(FT_UShort)start_point; | |
zone->n_contours = load->outline.n_contours - | |
(FT_Short)start_contour; | |
zone->org = load->extra_points + start_point; | |
zone->cur = load->outline.points + start_point; | |
zone->orus = load->extra_points2 + start_point; | |
zone->tags = (FT_Byte*)load->outline.tags + start_point; | |
zone->contours = (FT_UShort*)load->outline.contours + start_contour; | |
zone->first_point = (FT_UShort)start_point; | |
} | |
/*************************************************************************/ | |
/* */ | |
/* <Function> */ | |
/* TT_Hint_Glyph */ | |
/* */ | |
/* <Description> */ | |
/* Hint the glyph using the zone prepared by the caller. Note that */ | |
/* the zone is supposed to include four phantom points. */ | |
/* */ | |
static FT_Error | |
TT_Hint_Glyph( TT_Loader loader, | |
FT_Bool is_composite ) | |
{ | |
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING | |
TT_Face face = loader->face; | |
TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face ); | |
#endif | |
TT_GlyphZone zone = &loader->zone; | |
#ifdef TT_USE_BYTECODE_INTERPRETER | |
FT_Long n_ins; | |
#else | |
FT_UNUSED( is_composite ); | |
#endif | |
#ifdef TT_USE_BYTECODE_INTERPRETER | |
if ( loader->glyph->control_len > 0xFFFFL ) | |
{ | |
FT_TRACE1(( "TT_Hint_Glyph: too long instructions" )); | |
FT_TRACE1(( " (0x%lx byte) is truncated\n", | |
loader->glyph->control_len )); | |
} | |
n_ins = loader->glyph->control_len; | |
/* save original point position in org */ | |
if ( n_ins > 0 ) | |
FT_ARRAY_COPY( zone->org, zone->cur, zone->n_points ); | |
/* Reset graphics state. */ | |
loader->exec->GS = loader->size->GS; | |
/* XXX: UNDOCUMENTED! Hinting instructions of a composite glyph */ | |
/* completely refer to the (already) hinted subglyphs. */ | |
if ( is_composite ) | |
{ | |
loader->exec->metrics.x_scale = 1 << 16; | |
loader->exec->metrics.y_scale = 1 << 16; | |
FT_ARRAY_COPY( zone->orus, zone->cur, zone->n_points ); | |
} | |
else | |
{ | |
loader->exec->metrics.x_scale = loader->size->metrics.x_scale; | |
loader->exec->metrics.y_scale = loader->size->metrics.y_scale; | |
} | |
#endif | |
/* round phantom points */ | |
zone->cur[zone->n_points - 4].x = | |
FT_PIX_ROUND( zone->cur[zone->n_points - 4].x ); | |
zone->cur[zone->n_points - 3].x = | |
FT_PIX_ROUND( zone->cur[zone->n_points - 3].x ); | |
zone->cur[zone->n_points - 2].y = | |
FT_PIX_ROUND( zone->cur[zone->n_points - 2].y ); | |
zone->cur[zone->n_points - 1].y = | |
FT_PIX_ROUND( zone->cur[zone->n_points - 1].y ); | |
#ifdef TT_USE_BYTECODE_INTERPRETER | |
if ( n_ins > 0 ) | |
{ | |
FT_Error error; | |
FT_GlyphLoader gloader = loader->gloader; | |
FT_Outline current_outline = gloader->current.outline; | |
TT_Set_CodeRange( loader->exec, tt_coderange_glyph, | |
loader->exec->glyphIns, n_ins ); | |
loader->exec->is_composite = is_composite; | |
loader->exec->pts = *zone; | |
error = TT_Run_Context( loader->exec ); | |
if ( error && loader->exec->pedantic_hinting ) | |
return error; | |
/* store drop-out mode in bits 5-7; set bit 2 also as a marker */ | |
current_outline.tags[0] |= | |
( loader->exec->GS.scan_type << 5 ) | FT_CURVE_TAG_HAS_SCANMODE; | |
} | |
#endif | |
/* save glyph phantom points */ | |
loader->pp1 = zone->cur[zone->n_points - 4]; | |
loader->pp2 = zone->cur[zone->n_points - 3]; | |
loader->pp3 = zone->cur[zone->n_points - 2]; | |
loader->pp4 = zone->cur[zone->n_points - 1]; | |
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING | |
if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 ) | |
{ | |
if ( loader->exec->sph_tweak_flags & SPH_TWEAK_DEEMBOLDEN ) | |
FT_Outline_EmboldenXY( &loader->gloader->current.outline, -24, 0 ); | |
else if ( loader->exec->sph_tweak_flags & SPH_TWEAK_EMBOLDEN ) | |
FT_Outline_EmboldenXY( &loader->gloader->current.outline, 24, 0 ); | |
} | |
#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ | |
return FT_Err_Ok; | |
} | |
/*************************************************************************/ | |
/* */ | |
/* <Function> */ | |
/* TT_Process_Simple_Glyph */ | |
/* */ | |
/* <Description> */ | |
/* Once a simple glyph has been loaded, it needs to be processed. */ | |
/* Usually, this means scaling and hinting through bytecode */ | |
/* interpretation. */ | |
/* */ | |
static FT_Error | |
TT_Process_Simple_Glyph( TT_Loader loader ) | |
{ | |
FT_GlyphLoader gloader = loader->gloader; | |
FT_Error error = FT_Err_Ok; | |
FT_Outline* outline; | |
FT_Int n_points; | |
outline = &gloader->current.outline; | |
n_points = outline->n_points; | |
/* set phantom points */ | |
outline->points[n_points ] = loader->pp1; | |
outline->points[n_points + 1] = loader->pp2; | |
outline->points[n_points + 2] = loader->pp3; | |
outline->points[n_points + 3] = loader->pp4; | |
outline->tags[n_points ] = 0; | |
outline->tags[n_points + 1] = 0; | |
outline->tags[n_points + 2] = 0; | |
outline->tags[n_points + 3] = 0; | |
n_points += 4; | |
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT | |
if ( loader->face->doblend ) | |
{ | |
/* Deltas apply to the unscaled data. */ | |
error = TT_Vary_Apply_Glyph_Deltas( loader->face, | |
loader->glyph_index, | |
outline, | |
(FT_UInt)n_points ); | |
if ( error ) | |
return error; | |
} | |
#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ | |
if ( IS_HINTED( loader->load_flags ) ) | |
{ | |
tt_prepare_zone( &loader->zone, &gloader->current, 0, 0 ); | |
FT_ARRAY_COPY( loader->zone.orus, loader->zone.cur, | |
loader->zone.n_points + 4 ); | |
} | |
{ | |
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING | |
TT_Face face = loader->face; | |
TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face ); | |
FT_String* family = face->root.family_name; | |
FT_UInt ppem = loader->size->metrics.x_ppem; | |
FT_String* style = face->root.style_name; | |
FT_UInt x_scale_factor = 1000; | |
#endif | |
FT_Vector* vec = outline->points; | |
FT_Vector* limit = outline->points + n_points; | |
FT_Fixed x_scale = 0; /* pacify compiler */ | |
FT_Fixed y_scale = 0; | |
FT_Bool do_scale = FALSE; | |
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING | |
if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 ) | |
{ | |
/* scale, but only if enabled and only if TT hinting is being used */ | |
if ( IS_HINTED( loader->load_flags ) ) | |
x_scale_factor = sph_test_tweak_x_scaling( face, | |
family, | |
ppem, | |
style, | |
loader->glyph_index ); | |
/* scale the glyph */ | |
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 || | |
x_scale_factor != 1000 ) | |
{ | |
x_scale = FT_MulDiv( loader->size->metrics.x_scale, | |
(FT_Long)x_scale_factor, 1000 ); | |
y_scale = loader->size->metrics.y_scale; | |
/* compensate for any scaling by de/emboldening; */ | |
/* the amount was determined via experimentation */ | |
if ( x_scale_factor != 1000 && ppem > 11 ) | |
FT_Outline_EmboldenXY( outline, | |
FT_MulFix( 1280 * ppem, | |
1000 - x_scale_factor ), | |
0 ); | |
do_scale = TRUE; | |
} | |
} | |
else | |
#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ | |
{ | |
/* scale the glyph */ | |
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) | |
{ | |
x_scale = loader->size->metrics.x_scale; | |
y_scale = loader->size->metrics.y_scale; | |
do_scale = TRUE; | |
} | |
} | |
if ( do_scale ) | |
{ | |
for ( ; vec < limit; vec++ ) | |
{ | |
vec->x = FT_MulFix( vec->x, x_scale ); | |
vec->y = FT_MulFix( vec->y, y_scale ); | |
} | |
loader->pp1 = outline->points[n_points - 4]; | |
loader->pp2 = outline->points[n_points - 3]; | |
loader->pp3 = outline->points[n_points - 2]; | |
loader->pp4 = outline->points[n_points - 1]; | |
} | |
} | |
if ( IS_HINTED( loader->load_flags ) ) | |
{ | |
loader->zone.n_points += 4; | |
error = TT_Hint_Glyph( loader, 0 ); | |
} | |
return error; | |
} | |
/*************************************************************************/ | |
/* */ | |
/* <Function> */ | |
/* TT_Process_Composite_Component */ | |
/* */ | |
/* <Description> */ | |
/* Once a composite component has been loaded, it needs to be */ | |
/* processed. Usually, this means transforming and translating. */ | |
/* */ | |
static FT_Error | |
TT_Process_Composite_Component( TT_Loader loader, | |
FT_SubGlyph subglyph, | |
FT_UInt start_point, | |
FT_UInt num_base_points ) | |
{ | |
FT_GlyphLoader gloader = loader->gloader; | |
FT_Outline current; | |
FT_Bool have_scale; | |
FT_Pos x, y; | |
current.points = gloader->base.outline.points + | |
num_base_points; | |
current.n_points = gloader->base.outline.n_points - | |
(short)num_base_points; | |
have_scale = FT_BOOL( subglyph->flags & ( WE_HAVE_A_SCALE | | |
WE_HAVE_AN_XY_SCALE | | |
WE_HAVE_A_2X2 ) ); | |
/* perform the transform required for this subglyph */ | |
if ( have_scale ) | |
FT_Outline_Transform( ¤t, &subglyph->transform ); | |
/* get offset */ | |
if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) ) | |
{ | |
FT_UInt num_points = (FT_UInt)gloader->base.outline.n_points; | |
FT_UInt k = (FT_UInt)subglyph->arg1; | |
FT_UInt l = (FT_UInt)subglyph->arg2; | |
FT_Vector* p1; | |
FT_Vector* p2; | |
/* match l-th point of the newly loaded component to the k-th point */ | |
/* of the previously loaded components. */ | |
/* change to the point numbers used by our outline */ | |
k += start_point; | |
l += num_base_points; | |
if ( k >= num_base_points || | |
l >= num_points ) | |
return FT_THROW( Invalid_Composite ); | |
p1 = gloader->base.outline.points + k; | |
p2 = gloader->base.outline.points + l; | |
x = p1->x - p2->x; | |
y = p1->y - p2->y; | |
} | |
else | |
{ | |
x = subglyph->arg1; | |
y = subglyph->arg2; | |
if ( !x && !y ) | |
return FT_Err_Ok; | |
/* Use a default value dependent on */ | |
/* TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED. This is useful for old */ | |
/* TT fonts which don't set the xxx_COMPONENT_OFFSET bit. */ | |
if ( have_scale && | |
#ifdef TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED | |
!( subglyph->flags & UNSCALED_COMPONENT_OFFSET ) ) | |
#else | |
( subglyph->flags & SCALED_COMPONENT_OFFSET ) ) | |
#endif | |
{ | |
#if 0 | |
/*******************************************************************/ | |
/* */ | |
/* This algorithm is what Apple documents. But it doesn't work. */ | |
/* */ | |
int a = subglyph->transform.xx > 0 ? subglyph->transform.xx | |
: -subglyph->transform.xx; | |
int b = subglyph->transform.yx > 0 ? subglyph->transform.yx | |
: -subglyph->transform.yx; | |
int c = subglyph->transform.xy > 0 ? subglyph->transform.xy | |
: -subglyph->transform.xy; | |
int d = subglyph->transform.yy > 0 ? subglyph->transform.yy | |
: -subglyph->transform.yy; | |
int m = a > b ? a : b; | |
int n = c > d ? c : d; | |
if ( a - b <= 33 && a - b >= -33 ) | |
m *= 2; | |
if ( c - d <= 33 && c - d >= -33 ) | |
n *= 2; | |
x = FT_MulFix( x, m ); | |
y = FT_MulFix( y, n ); | |
#else /* 1 */ | |
/*******************************************************************/ | |
/* */ | |
/* This algorithm is a guess and works much better than the above. */ | |
/* */ | |
FT_Fixed mac_xscale = FT_Hypot( subglyph->transform.xx, | |
subglyph->transform.xy ); | |
FT_Fixed mac_yscale = FT_Hypot( subglyph->transform.yy, | |
subglyph->transform.yx ); | |
x = FT_MulFix( x, mac_xscale ); | |
y = FT_MulFix( y, mac_yscale ); | |
#endif /* 1 */ | |
} | |
if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) | |
{ | |
FT_Fixed x_scale = loader->size->metrics.x_scale; | |
FT_Fixed y_scale = loader->size->metrics.y_scale; | |
x = FT_MulFix( x, x_scale ); | |
y = FT_MulFix( y, y_scale ); | |
if ( subglyph->flags & ROUND_XY_TO_GRID ) | |
{ | |
x = FT_PIX_ROUND( x ); | |
y = FT_PIX_ROUND( y ); | |
} | |
} | |
} | |
if ( x || y ) | |
FT_Outline_Translate( ¤t, x, y ); | |
return FT_Err_Ok; | |
} | |
/*************************************************************************/ | |
/* */ | |
/* <Function> */ | |
/* TT_Process_Composite_Glyph */ | |
/* */ | |
/* <Description> */ | |
/* This is slightly different from TT_Process_Simple_Glyph, in that */ | |
/* its sole purpose is to hint the glyph. Thus this function is */ | |
/* only available when bytecode interpreter is enabled. */ | |
/* */ | |
static FT_Error | |
TT_Process_Composite_Glyph( TT_Loader loader, | |
FT_UInt start_point, | |
FT_UInt start_contour ) | |
{ | |
FT_Error error; | |
FT_Outline* outline; | |
FT_UInt i; | |
outline = &loader->gloader->base.outline; | |
/* make room for phantom points */ | |
error = FT_GLYPHLOADER_CHECK_POINTS( loader->gloader, | |
outline->n_points + 4, | |
0 ); | |
if ( error ) | |
return error; | |
outline->points[outline->n_points ] = loader->pp1; | |
outline->points[outline->n_points + 1] = loader->pp2; | |
outline->points[outline->n_points + 2] = loader->pp3; | |
outline->points[outline->n_points + 3] = loader->pp4; | |
outline->tags[outline->n_points ] = 0; | |
outline->tags[outline->n_points + 1] = 0; | |
outline->tags[outline->n_points + 2] = 0; | |
outline->tags[outline->n_points + 3] = 0; | |
#ifdef TT_USE_BYTECODE_INTERPRETER | |
{ | |
FT_Stream stream = loader->stream; | |
FT_UShort n_ins, max_ins; | |
FT_ULong tmp; | |
/* TT_Load_Composite_Glyph only gives us the offset of instructions */ | |
/* so we read them here */ | |
if ( FT_STREAM_SEEK( loader->ins_pos ) || | |
FT_READ_USHORT( n_ins ) ) | |
return error; | |
FT_TRACE5(( " Instructions size = %d\n", n_ins )); | |
/* check it */ | |
max_ins = loader->face->max_profile.maxSizeOfInstructions; | |
if ( n_ins > max_ins ) | |
{ | |
/* don't trust `maxSizeOfInstructions'; */ | |
/* only do a rough safety check */ | |
if ( (FT_Int)n_ins > loader->byte_len ) | |
{ | |
FT_TRACE1(( "TT_Process_Composite_Glyph:" | |
" too many instructions (%d) for glyph with length %d\n", | |
n_ins, loader->byte_len )); | |
return FT_THROW( Too_Many_Hints ); | |
} | |
tmp = loader->exec->glyphSize; | |
error = Update_Max( loader->exec->memory, | |
&tmp, | |
sizeof ( FT_Byte ), | |
(void*)&loader->exec->glyphIns, | |
n_ins ); | |
loader->exec->glyphSize = (FT_UShort)tmp; | |
if ( error ) | |
return error; | |
} | |
else if ( n_ins == 0 ) | |
return FT_Err_Ok; | |
if ( FT_STREAM_READ( loader->exec->glyphIns, n_ins ) ) | |
return error; | |
loader->glyph->control_data = loader->exec->glyphIns; | |
loader->glyph->control_len = n_ins; | |
} | |
#endif | |
tt_prepare_zone( &loader->zone, &loader->gloader->base, | |
start_point, start_contour ); | |
/* Some points are likely touched during execution of */ | |
/* instructions on components. So let's untouch them. */ | |
for ( i = 0; i < loader->zone.n_points; i++ ) | |
loader->zone.tags[i] &= ~FT_CURVE_TAG_TOUCH_BOTH; | |
loader->zone.n_points += 4; | |
return TT_Hint_Glyph( loader, 1 ); | |
} | |
/* | |
* Calculate the phantom points | |
* | |
* Defining the right side bearing (rsb) as | |
* | |
* rsb = aw - (lsb + xmax - xmin) | |
* | |
* (with `aw' the advance width, `lsb' the left side bearing, and `xmin' | |
* and `xmax' the glyph's minimum and maximum x value), the OpenType | |
* specification defines the initial position of horizontal phantom points | |
* as | |
* | |
* pp1 = (round(xmin - lsb), 0) , | |
* pp2 = (round(pp1 + aw), 0) . | |
* | |
* Note that the rounding to the grid (in the device space) is not | |
* documented currently in the specification. | |
* | |
* However, the specification lacks the precise definition of vertical | |
* phantom points. Greg Hitchcock provided the following explanation. | |
* | |
* - a `vmtx' table is present | |
* | |
* For any glyph, the minimum and maximum y values (`ymin' and `ymax') | |
* are given in the `glyf' table, the top side bearing (tsb) and advance | |
* height (ah) are given in the `vmtx' table. The bottom side bearing | |
* (bsb) is then calculated as | |
* | |
* bsb = ah - (tsb + ymax - ymin) , | |
* | |
* and the initial position of vertical phantom points is | |
* | |
* pp3 = (x, round(ymax + tsb)) , | |
* pp4 = (x, round(pp3 - ah)) . | |
* | |
* See below for value `x'. | |
* | |
* - no `vmtx' table in the font | |
* | |
* If there is an `OS/2' table, we set | |
* | |
* DefaultAscender = sTypoAscender , | |
* DefaultDescender = sTypoDescender , | |
* | |
* otherwise we use data from the `hhea' table: | |
* | |
* DefaultAscender = Ascender , | |
* DefaultDescender = Descender . | |
* | |
* With these two variables we can now set | |
* | |
* ah = DefaultAscender - sDefaultDescender , | |
* tsb = DefaultAscender - yMax , | |
* | |
* and proceed as if a `vmtx' table was present. | |
* | |
* Usually we have | |
* | |
* x = aw / 2 , (1) | |
* | |
* but there is one compatibility case where it can be set to | |
* | |
* x = -DefaultDescender - | |
* ((DefaultAscender - DefaultDescender - aw) / 2) . (2) | |
* | |
* and another one with | |
* | |
* x = 0 . (3) | |
* | |
* In Windows, the history of those values is quite complicated, | |
* depending on the hinting engine (that is, the graphics framework). | |
* | |
* framework from to formula | |
* ---------------------------------------------------------- | |
* GDI Windows 98 current (1) | |
* (Windows 2000 for NT) | |
* GDI+ Windows XP Windows 7 (2) | |
* GDI+ Windows 8 current (3) | |
* DWrite Windows 7 current (3) | |
* | |
* For simplicity, FreeType uses (1) for grayscale subpixel hinting and | |
* (3) for everything else. | |
* | |
*/ | |
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING | |
#define TT_LOADER_SET_PP( loader ) \ | |
do \ | |
{ \ | |
FT_Bool subpixel_hinting_ = loader->exec \ | |
? loader->exec->subpixel_hinting \ | |
: 0; \ | |
FT_Bool grayscale_ = loader->exec \ | |
? loader->exec->grayscale \ | |
: 0; \ | |
FT_Bool use_aw_2_ = (FT_Bool)( subpixel_hinting_ && \ | |
grayscale_ ); \ | |
\ | |
\ | |
(loader)->pp1.x = (loader)->bbox.xMin - (loader)->left_bearing; \ | |
(loader)->pp1.y = 0; \ | |
(loader)->pp2.x = (loader)->pp1.x + (loader)->advance; \ | |
(loader)->pp2.y = 0; \ | |
\ | |
(loader)->pp3.x = use_aw_2_ ? (loader)->advance / 2 : 0; \ | |
(loader)->pp3.y = (loader)->bbox.yMax + (loader)->top_bearing; \ | |
(loader)->pp4.x = use_aw_2_ ? (loader)->advance / 2 : 0; \ | |
(loader)->pp4.y = (loader)->pp3.y - (loader)->vadvance; \ | |
} while ( 0 ) | |
#else /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */ | |
#define TT_LOADER_SET_PP( loader ) \ | |
do \ | |
{ \ | |
(loader)->pp1.x = (loader)->bbox.xMin - (loader)->left_bearing; \ | |
(loader)->pp1.y = 0; \ | |
(loader)->pp2.x = (loader)->pp1.x + (loader)->advance; \ | |
(loader)->pp2.y = 0; \ | |
\ | |
(loader)->pp3.x = 0; \ | |
(loader)->pp3.y = (loader)->bbox.yMax + (loader)->top_bearing; \ | |
(loader)->pp4.x = 0; \ | |
(loader)->pp4.y = (loader)->pp3.y - (loader)->vadvance; \ | |
} while ( 0 ) | |
#endif /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */ | |
/*************************************************************************/ | |
/* */ | |
/* <Function> */ | |
/* load_truetype_glyph */ | |
/* */ | |
/* <Description> */ | |
/* Loads a given truetype glyph. Handles composites and uses a */ | |
/* TT_Loader object. */ | |
/* */ | |
static FT_Error | |
load_truetype_glyph( TT_Loader loader, | |
FT_UInt glyph_index, | |
FT_UInt recurse_count, | |
FT_Bool header_only ) | |
{ | |
FT_Error error = FT_Err_Ok; | |
FT_Fixed x_scale, y_scale; | |
FT_ULong offset; | |
TT_Face face = loader->face; | |
FT_GlyphLoader gloader = loader->gloader; | |
FT_Bool opened_frame = 0; | |
#ifdef FT_CONFIG_OPTION_INCREMENTAL | |
FT_StreamRec inc_stream; | |
FT_Data glyph_data; | |
FT_Bool glyph_data_loaded = 0; | |
#endif | |
#ifdef FT_DEBUG_LEVEL_TRACE | |
if ( recurse_count ) | |
FT_TRACE5(( " nesting level: %d\n", recurse_count )); | |
#endif | |
/* some fonts have an incorrect value of `maxComponentDepth', */ | |
/* thus we allow depth 1 to catch the majority of them */ | |
if ( recurse_count > 1 && | |
recurse_count > face->max_profile.maxComponentDepth ) | |
{ | |
error = FT_THROW( Invalid_Composite ); | |
goto Exit; | |
} | |
#ifndef FT_CONFIG_OPTION_INCREMENTAL | |
/* check glyph index */ | |
if ( glyph_index >= (FT_UInt)face->root.num_glyphs ) | |
{ | |
error = FT_THROW( Invalid_Glyph_Index ); | |
goto Exit; | |
} | |
#endif | |
loader->glyph_index = glyph_index; | |
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) | |
{ | |
x_scale = loader->size->metrics.x_scale; | |
y_scale = loader->size->metrics.y_scale; | |
} | |
else | |
{ | |
x_scale = 0x10000L; | |
y_scale = 0x10000L; | |
} | |
/* Set `offset' to the start of the glyph relative to the start of */ | |
/* the `glyf' table, and `byte_len' to the length of the glyph in */ | |
/* bytes. */ | |
#ifdef FT_CONFIG_OPTION_INCREMENTAL | |
/* If we are loading glyph data via the incremental interface, set */ | |
/* the loader stream to a memory stream reading the data returned */ | |
/* by the interface. */ | |
if ( face->root.internal->incremental_interface ) | |
{ | |
error = face->root.internal->incremental_interface->funcs->get_glyph_data( | |
face->root.internal->incremental_interface->object, | |
glyph_index, &glyph_data ); | |
if ( error ) | |
goto Exit; | |
glyph_data_loaded = 1; | |
offset = 0; | |
loader->byte_len = glyph_data.length; | |
FT_MEM_ZERO( &inc_stream, sizeof ( inc_stream ) ); | |
FT_Stream_OpenMemory( &inc_stream, | |
glyph_data.pointer, | |
(FT_ULong)glyph_data.length ); | |
loader->stream = &inc_stream; | |
} | |
else | |
#endif /* FT_CONFIG_OPTION_INCREMENTAL */ | |
offset = tt_face_get_location( face, glyph_index, | |
(FT_UInt*)&loader->byte_len ); | |
if ( loader->byte_len > 0 ) | |
{ | |
#ifdef FT_CONFIG_OPTION_INCREMENTAL | |
/* for the incremental interface, `glyf_offset' is always zero */ | |
if ( !loader->glyf_offset && | |
!face->root.internal->incremental_interface ) | |
#else | |
if ( !loader->glyf_offset ) | |
#endif /* FT_CONFIG_OPTION_INCREMENTAL */ | |
{ | |
FT_TRACE2(( "no `glyf' table but non-zero `loca' entry\n" )); | |
error = FT_THROW( Invalid_Table ); | |
goto Exit; | |
} | |
error = face->access_glyph_frame( loader, glyph_index, | |
loader->glyf_offset + offset, | |
(FT_UInt)loader->byte_len ); | |
if ( error ) | |
goto Exit; | |
opened_frame = 1; | |
/* read glyph header first */ | |
error = face->read_glyph_header( loader ); | |
if ( error ) | |
goto Exit; | |
/* the metrics must be computed after loading the glyph header */ | |
/* since we need the glyph's `yMax' value in case the vertical */ | |
/* metrics must be emulated */ | |
error = tt_get_metrics( loader, glyph_index ); | |
if ( error ) | |
goto Exit; | |
if ( header_only ) | |
goto Exit; | |
} | |
if ( loader->byte_len == 0 || loader->n_contours == 0 ) | |
{ | |
loader->bbox.xMin = 0; | |
loader->bbox.xMax = 0; | |
loader->bbox.yMin = 0; | |
loader->bbox.yMax = 0; | |
error = tt_get_metrics( loader, glyph_index ); | |
if ( error ) | |
goto Exit; | |
if ( header_only ) | |
goto Exit; | |
/* must initialize points before (possibly) overriding */ | |
/* glyph metrics from the incremental interface */ | |
TT_LOADER_SET_PP( loader ); | |
#ifdef FT_CONFIG_OPTION_INCREMENTAL | |
tt_get_metrics_incr_overrides( loader, glyph_index ); | |
#endif | |
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT | |
if ( loader->face->doblend ) | |
{ | |
/* a small outline structure with four elements for */ | |
/* communication with `TT_Vary_Apply_Glyph_Deltas' */ | |
FT_Vector points[4]; | |
char tags[4] = { 1, 1, 1, 1 }; | |
short contours[4] = { 0, 1, 2, 3 }; | |
FT_Outline outline; | |
points[0].x = loader->pp1.x; | |
points[0].y = loader->pp1.y; | |
points[1].x = loader->pp2.x; | |
points[1].y = loader->pp2.y; | |
points[2].x = loader->pp3.x; | |
points[2].y = loader->pp3.y; | |
points[3].x = loader->pp4.x; | |
points[3].y = loader->pp4.y; | |
outline.n_points = 4; | |
outline.n_contours = 4; | |
outline.points = points; | |
outline.tags = tags; | |
outline.contours = contours; | |
/* this must be done before scaling */ | |
error = TT_Vary_Apply_Glyph_Deltas( loader->face, | |
glyph_index, | |
&outline, | |
(FT_UInt)outline.n_points ); | |
if ( error ) | |
goto Exit; | |
loader->pp1.x = points[0].x; | |
loader->pp1.y = points[0].y; | |
loader->pp2.x = points[1].x; | |
loader->pp2.y = points[1].y; | |
loader->pp3.x = points[2].x; | |
loader->pp3.y = points[2].y; | |
loader->pp4.x = points[3].x; | |
loader->pp4.y = points[3].y; | |
} | |
#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ | |
/* scale phantom points, if necessary; */ | |
/* they get rounded in `TT_Hint_Glyph' */ | |
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) | |
{ | |
loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale ); | |
loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); | |
/* pp1.y and pp2.y are always zero */ | |
loader->pp3.x = FT_MulFix( loader->pp3.x, x_scale ); | |
loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale ); | |
loader->pp4.x = FT_MulFix( loader->pp4.x, x_scale ); | |
loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale ); | |
} | |
error = FT_Err_Ok; | |
goto Exit; | |
} | |
/* must initialize phantom points before (possibly) overriding */ | |
/* glyph metrics from the incremental interface */ | |
TT_LOADER_SET_PP( loader ); | |
#ifdef FT_CONFIG_OPTION_INCREMENTAL | |
tt_get_metrics_incr_overrides( loader, glyph_index ); | |
#endif | |
/***********************************************************************/ | |
/***********************************************************************/ | |
/***********************************************************************/ | |
/* if it is a simple glyph, load it */ | |
if ( loader->n_contours > 0 ) | |
{ | |
error = face->read_simple_glyph( loader ); | |
if ( error ) | |
goto Exit; | |
/* all data have been read */ | |
face->forget_glyph_frame( loader ); | |
opened_frame = 0; | |
error = TT_Process_Simple_Glyph( loader ); | |
if ( error ) | |
goto Exit; | |
FT_GlyphLoader_Add( gloader ); | |
} | |
/***********************************************************************/ | |
/***********************************************************************/ | |
/***********************************************************************/ | |
/* otherwise, load a composite! */ | |
else if ( loader->n_contours == -1 ) | |
{ | |
FT_Memory memory = face->root.memory; | |
FT_UInt start_point; | |
FT_UInt start_contour; | |
FT_ULong ins_pos; /* position of composite instructions, if any */ | |
/* | |
* We store the glyph index directly in the `node->data' pointer, | |
* following the glib solution (cf. macro `GUINT_TO_POINTER') with a | |
* double cast to make this portable. Note, however, that this needs | |
* pointers with a width of at least 32 bits. | |
*/ | |
/* check whether we already have a composite glyph with this index */ | |
if ( FT_List_Find( &loader->composites, | |
(void*)(unsigned long)glyph_index ) ) | |
{ | |
FT_TRACE1(( "TT_Load_Composite_Glyph:" | |
" infinite recursion detected\n" )); | |
error = FT_THROW( Invalid_Composite ); | |
goto Exit; | |
} | |
else | |
{ | |
FT_ListNode node = NULL; | |
if ( FT_NEW( node ) ) | |
goto Exit; | |
node->data = (void*)(unsigned long)glyph_index; | |
FT_List_Add( &loader->composites, node ); | |
} | |
start_point = (FT_UInt)gloader->base.outline.n_points; | |
start_contour = (FT_UInt)gloader->base.outline.n_contours; | |
/* for each subglyph, read composite header */ | |
error = face->read_composite_glyph( loader ); | |
if ( error ) | |
goto Exit; | |
/* store the offset of instructions */ | |
ins_pos = loader->ins_pos; | |
/* all data we need are read */ | |
face->forget_glyph_frame( loader ); | |
opened_frame = 0; | |
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT | |
if ( face->doblend ) | |
{ | |
short i, limit; | |
FT_SubGlyph subglyph; | |
FT_Outline outline; | |
FT_Vector* points = NULL; | |
char* tags = NULL; | |
short* contours = NULL; | |
limit = (short)gloader->current.num_subglyphs; | |
/* construct an outline structure for */ | |
/* communication with `TT_Vary_Apply_Glyph_Deltas' */ | |
outline.n_points = (short)( gloader->current.num_subglyphs + 4 ); | |
outline.n_contours = outline.n_points; | |
if ( FT_NEW_ARRAY( points, outline.n_points ) || | |
FT_NEW_ARRAY( tags, outline.n_points ) || | |
FT_NEW_ARRAY( contours, outline.n_points ) ) | |
goto Exit1; | |
subglyph = gloader->current.subglyphs; | |
for ( i = 0; i < limit; i++, subglyph++ ) | |
{ | |
/* applying deltas for anchor points doesn't make sense, */ | |
/* but we don't have to specially check this since */ | |
/* unused delta values are zero anyways */ | |
points[i].x = subglyph->arg1; | |
points[i].y = subglyph->arg2; | |
tags[i] = 1; | |
contours[i] = i; | |
} | |
points[i].x = loader->pp1.x; | |
points[i].y = loader->pp1.y; | |
tags[i] = 1; | |
contours[i] = i; | |
i++; | |
points[i].x = loader->pp2.x; | |
points[i].y = loader->pp2.y; | |
tags[i] = 1; | |
contours[i] = i; | |
i++; | |
points[i].x = loader->pp3.x; | |
points[i].y = loader->pp3.y; | |
tags[i] = 1; | |
contours[i] = i; | |
i++; | |
points[i].x = loader->pp4.x; | |
points[i].y = loader->pp4.y; | |
tags[i] = 1; | |
contours[i] = i; | |
outline.points = points; | |
outline.tags = tags; | |
outline.contours = contours; | |
/* this call provides additional offsets */ | |
/* for each component's translation */ | |
if ( ( error = TT_Vary_Apply_Glyph_Deltas( | |
face, | |
glyph_index, | |
&outline, | |
(FT_UInt)outline.n_points ) ) != 0 ) | |
goto Exit1; | |
subglyph = gloader->current.subglyphs; | |
for ( i = 0; i < limit; i++, subglyph++ ) | |
{ | |
/* XXX: overflow check for subglyph->{arg1,arg2}. */ | |
/* Deltas must be within signed 16-bit, */ | |
/* but the restriction of summed deltas is not clear */ | |
subglyph->arg1 = (FT_Int16)points[i].x; | |
subglyph->arg2 = (FT_Int16)points[i].y; | |
} | |
loader->pp1.x = points[i + 0].x; | |
loader->pp1.y = points[i + 0].y; | |
loader->pp2.x = points[i + 1].x; | |
loader->pp2.y = points[i + 1].y; | |
loader->pp3.x = points[i + 2].x; | |
loader->pp3.y = points[i + 2].y; | |
loader->pp4.x = points[i + 3].x; | |
loader->pp4.y = points[i + 3].y; | |
Exit1: | |
FT_FREE( outline.points ); | |
FT_FREE( outline.tags ); | |
FT_FREE( outline.contours ); | |
if ( error ) | |
goto Exit; | |
} | |
#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */ | |
/* scale phantom points, if necessary; */ | |
/* they get rounded in `TT_Hint_Glyph' */ | |
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) | |
{ | |
loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale ); | |
loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale ); | |
/* pp1.y and pp2.y are always zero */ | |
loader->pp3.x = FT_MulFix( loader->pp3.x, x_scale ); | |
loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale ); | |
loader->pp4.x = FT_MulFix( loader->pp4.x, x_scale ); | |
loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale ); | |
} | |
/* if the flag FT_LOAD_NO_RECURSE is set, we return the subglyph */ | |
/* `as is' in the glyph slot (the client application will be */ | |
/* responsible for interpreting these data)... */ | |
if ( loader->load_flags & FT_LOAD_NO_RECURSE ) | |
{ | |
FT_GlyphLoader_Add( gloader ); | |
loader->glyph->format = FT_GLYPH_FORMAT_COMPOSITE; | |
goto Exit; | |
} | |
/*********************************************************************/ | |
/*********************************************************************/ | |
/*********************************************************************/ | |
{ | |
FT_UInt n, num_base_points; | |
FT_SubGlyph subglyph = NULL; | |
FT_UInt num_points = start_point; | |
FT_UInt num_subglyphs = gloader->current.num_subglyphs; | |
FT_UInt num_base_subgs = gloader->base.num_subglyphs; | |
FT_Stream old_stream = loader->stream; | |
FT_Int old_byte_len = loader->byte_len; | |
FT_GlyphLoader_Add( gloader ); | |
/* read each subglyph independently */ | |
for ( n = 0; n < num_subglyphs; n++ ) | |
{ | |
FT_Vector pp[4]; | |
/* Each time we call load_truetype_glyph in this loop, the */ | |
/* value of `gloader.base.subglyphs' can change due to table */ | |
/* reallocations. We thus need to recompute the subglyph */ | |
/* pointer on each iteration. */ | |
subglyph = gloader->base.subglyphs + num_base_subgs + n; | |
pp[0] = loader->pp1; | |
pp[1] = loader->pp2; | |
pp[2] = loader->pp3; | |
pp[3] = loader->pp4; | |
num_base_points = (FT_UInt)gloader->base.outline.n_points; | |
error = load_truetype_glyph( loader, | |
(FT_UInt)subglyph->index, | |
recurse_count + 1, | |
FALSE ); | |
if ( error ) | |
goto Exit; | |
/* restore subglyph pointer */ | |
subglyph = gloader->base.subglyphs + num_base_subgs + n; | |
/* restore phantom points if necessary */ | |
if ( !( subglyph->flags & USE_MY_METRICS ) ) | |
{ | |
loader->pp1 = pp[0]; | |
loader->pp2 = pp[1]; | |
loader->pp3 = pp[2]; | |
loader->pp4 = pp[3]; | |
} | |
num_points = (FT_UInt)gloader->base.outline.n_points; | |
if ( num_points == num_base_points ) | |
continue; | |
/* gloader->base.outline consists of three parts: */ | |
/* 0 -(1)-> start_point -(2)-> num_base_points -(3)-> n_points. */ | |
/* */ | |
/* (1): exists from the beginning */ | |
/* (2): components that have been loaded so far */ | |
/* (3): the newly loaded component */ | |
error = TT_Process_Composite_Component( loader, | |
subglyph, | |
start_point, | |
num_base_points ); | |
if ( error ) | |
goto Exit; | |
} | |
loader->stream = old_stream; | |
loader->byte_len = old_byte_len; | |
/* process the glyph */ | |
loader->ins_pos = ins_pos; | |
if ( IS_HINTED( loader->load_flags ) && | |
#ifdef TT_USE_BYTECODE_INTERPRETER | |
subglyph->flags & WE_HAVE_INSTR && | |
#endif | |
num_points > start_point ) | |
{ | |
error = TT_Process_Composite_Glyph( loader, | |
start_point, | |
start_contour ); | |
if ( error ) | |
goto Exit; | |
} | |
} | |
} | |
else | |
{ | |
/* invalid composite count (negative but not -1) */ | |
error = FT_THROW( Invalid_Outline ); | |
goto Exit; | |
} | |
/***********************************************************************/ | |
/***********************************************************************/ | |
/***********************************************************************/ | |
Exit: | |
if ( opened_frame ) | |
face->forget_glyph_frame( loader ); | |
#ifdef FT_CONFIG_OPTION_INCREMENTAL | |
if ( glyph_data_loaded ) | |
face->root.internal->incremental_interface->funcs->free_glyph_data( | |
face->root.internal->incremental_interface->object, | |
&glyph_data ); | |
#endif | |
return error; | |
} | |
static FT_Error | |
compute_glyph_metrics( TT_Loader loader, | |
FT_UInt glyph_index ) | |
{ | |
TT_Face face = loader->face; | |
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING | |
TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face ); | |
#endif | |
FT_BBox bbox; | |
FT_Fixed y_scale; | |
TT_GlyphSlot glyph = loader->glyph; | |
TT_Size size = loader->size; | |
y_scale = 0x10000L; | |
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 ) | |
y_scale = size->root.metrics.y_scale; | |
if ( glyph->format != FT_GLYPH_FORMAT_COMPOSITE ) | |
FT_Outline_Get_CBox( &glyph->outline, &bbox ); | |
else | |
bbox = loader->bbox; | |
/* get the device-independent horizontal advance; it is scaled later */ | |
/* by the base layer. */ | |
glyph->linearHoriAdvance = loader->linear; | |
glyph->metrics.horiBearingX = bbox.xMin; | |
glyph->metrics.horiBearingY = bbox.yMax; | |
glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x; | |
/* adjust advance width to the value contained in the hdmx table */ | |
/* unless FT_LOAD_COMPUTE_METRICS is set */ | |
if ( !face->postscript.isFixedPitch && | |
IS_HINTED( loader->load_flags ) && | |
!( loader->load_flags & FT_LOAD_COMPUTE_METRICS ) ) | |
{ | |
FT_Byte* widthp; | |
widthp = tt_face_get_device_metrics( face, | |
size->root.metrics.x_ppem, | |
glyph_index ); | |
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING | |
if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 ) | |
{ | |
FT_Bool ignore_x_mode; | |
ignore_x_mode = FT_BOOL( FT_LOAD_TARGET_MODE( loader->load_flags ) != | |
FT_RENDER_MODE_MONO ); | |
if ( widthp && | |
( ( ignore_x_mode && loader->exec->compatible_widths ) || | |
!ignore_x_mode || | |
SPH_OPTION_BITMAP_WIDTHS ) ) | |
glyph->metrics.horiAdvance = *widthp * 64; | |
} | |
else | |
#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ | |
{ | |
if ( widthp ) | |
glyph->metrics.horiAdvance = *widthp * 64; | |
} | |
} | |
/* set glyph dimensions */ | |
glyph->metrics.width = bbox.xMax - bbox.xMin; | |
glyph->metrics.height = bbox.yMax - bbox.yMin; | |
/* Now take care of vertical metrics. In the case where there is */ | |
/* no vertical information within the font (relatively common), */ | |
/* create some metrics manually */ | |
{ | |
FT_Pos top; /* scaled vertical top side bearing */ | |
FT_Pos advance; /* scaled vertical advance height */ | |
/* Get the unscaled top bearing and advance height. */ | |
if ( face->vertical_info && | |
face->vertical.number_Of_VMetrics > 0 ) | |
{ | |
top = (FT_Short)FT_DivFix( loader->pp3.y - bbox.yMax, | |
y_scale ); | |
if ( loader->pp3.y <= loader->pp4.y ) | |
advance = 0; | |
else | |
advance = (FT_UShort)FT_DivFix( loader->pp3.y - loader->pp4.y, | |
y_scale ); | |
} | |
else | |
{ | |
FT_Pos height; | |
/* XXX Compute top side bearing and advance height in */ | |
/* Get_VMetrics instead of here. */ | |
/* NOTE: The OS/2 values are the only `portable' ones, */ | |
/* which is why we use them, if there is an OS/2 */ | |
/* table in the font. Otherwise, we use the */ | |
/* values defined in the horizontal header. */ | |
height = (FT_Short)FT_DivFix( bbox.yMax - bbox.yMin, | |
y_scale ); | |
if ( face->os2.version != 0xFFFFU ) | |
advance = (FT_Pos)( face->os2.sTypoAscender - | |
face->os2.sTypoDescender ); | |
else | |
advance = (FT_Pos)( face->horizontal.Ascender - | |
face->horizontal.Descender ); | |
top = ( advance - height ) / 2; | |
} | |
#ifdef FT_CONFIG_OPTION_INCREMENTAL | |
{ | |
FT_Incremental_InterfaceRec* incr; | |
FT_Incremental_MetricsRec metrics; | |
FT_Error error; | |
incr = face->root.internal->incremental_interface; | |
/* If this is an incrementally loaded font see if there are */ | |
/* overriding metrics for this glyph. */ | |
if ( incr && incr->funcs->get_glyph_metrics ) | |
{ | |
metrics.bearing_x = 0; | |
metrics.bearing_y = top; | |
metrics.advance = advance; | |
error = incr->funcs->get_glyph_metrics( incr->object, | |
glyph_index, | |
TRUE, | |
&metrics ); | |
if ( error ) | |
return error; | |
top = metrics.bearing_y; | |
advance = metrics.advance; | |
} | |
} | |
/* GWW: Do vertical metrics get loaded incrementally too? */ | |
#endif /* FT_CONFIG_OPTION_INCREMENTAL */ | |
glyph->linearVertAdvance = advance; | |
/* scale the metrics */ | |
if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) ) | |
{ | |
top = FT_MulFix( top, y_scale ); | |
advance = FT_MulFix( advance, y_scale ); | |
} | |
/* XXX: for now, we have no better algorithm for the lsb, but it */ | |
/* should work fine. */ | |
/* */ | |
glyph->metrics.vertBearingX = glyph->metrics.horiBearingX - | |
glyph->metrics.horiAdvance / 2; | |
glyph->metrics.vertBearingY = top; | |
glyph->metrics.vertAdvance = advance; | |
} | |
return 0; | |
} | |
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS | |
static FT_Error | |
load_sbit_image( TT_Size size, | |
TT_GlyphSlot glyph, | |
FT_UInt glyph_index, | |
FT_Int32 load_flags ) | |
{ | |
TT_Face face; | |
SFNT_Service sfnt; | |
FT_Stream stream; | |
FT_Error error; | |
TT_SBit_MetricsRec metrics; | |
face = (TT_Face)glyph->face; | |
sfnt = (SFNT_Service)face->sfnt; | |
stream = face->root.stream; | |
error = sfnt->load_sbit_image( face, | |
size->strike_index, | |
glyph_index, | |
(FT_UInt)load_flags, | |
stream, | |
&glyph->bitmap, | |
&metrics ); | |
if ( !error ) | |
{ | |
glyph->outline.n_points = 0; | |
glyph->outline.n_contours = 0; | |
glyph->metrics.width = (FT_Pos)metrics.width * 64; | |
glyph->metrics.height = (FT_Pos)metrics.height * 64; | |
glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX * 64; | |
glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY * 64; | |
glyph->metrics.horiAdvance = (FT_Pos)metrics.horiAdvance * 64; | |
glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX * 64; | |
glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY * 64; | |
glyph->metrics.vertAdvance = (FT_Pos)metrics.vertAdvance * 64; | |
glyph->format = FT_GLYPH_FORMAT_BITMAP; | |
if ( load_flags & FT_LOAD_VERTICAL_LAYOUT ) | |
{ | |
glyph->bitmap_left = metrics.vertBearingX; | |
glyph->bitmap_top = metrics.vertBearingY; | |
} | |
else | |
{ | |
glyph->bitmap_left = metrics.horiBearingX; | |
glyph->bitmap_top = metrics.horiBearingY; | |
} | |
} | |
return error; | |
} | |
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ | |
static FT_Error | |
tt_loader_init( TT_Loader loader, | |
TT_Size size, | |
TT_GlyphSlot glyph, | |
FT_Int32 load_flags, | |
FT_Bool glyf_table_only ) | |
{ | |
FT_Error error; | |
TT_Face face; | |
FT_Stream stream; | |
#ifdef TT_USE_BYTECODE_INTERPRETER | |
FT_Bool pedantic = FT_BOOL( load_flags & FT_LOAD_PEDANTIC ); | |
#endif | |
face = (TT_Face)glyph->face; | |
stream = face->root.stream; | |
FT_MEM_ZERO( loader, sizeof ( TT_LoaderRec ) ); | |
#ifdef TT_USE_BYTECODE_INTERPRETER | |
/* load execution context */ | |
if ( IS_HINTED( load_flags ) && !glyf_table_only ) | |
{ | |
TT_ExecContext exec; | |
FT_Bool grayscale; | |
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING | |
TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face ); | |
FT_Bool subpixel_hinting = FALSE; | |
#if 0 | |
/* not used yet */ | |
FT_Bool compatible_widths; | |
FT_Bool symmetrical_smoothing; | |
FT_Bool bgr; | |
FT_Bool vertical_lcd; | |
FT_Bool subpixel_positioned; | |
FT_Bool gray_cleartype; | |
#endif | |
#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ | |
FT_Bool reexecute = FALSE; | |
if ( size->bytecode_ready < 0 || size->cvt_ready < 0 ) | |
{ | |
error = tt_size_ready_bytecode( size, pedantic ); | |
if ( error ) | |
return error; | |
} | |
else if ( size->bytecode_ready ) | |
return size->bytecode_ready; | |
else if ( size->cvt_ready ) | |
return size->cvt_ready; | |
/* query new execution context */ | |
exec = size->context; | |
if ( !exec ) | |
return FT_THROW( Could_Not_Find_Context ); | |
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING | |
if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 ) | |
{ | |
subpixel_hinting = FT_BOOL( ( FT_LOAD_TARGET_MODE( load_flags ) != | |
FT_RENDER_MODE_MONO ) && | |
SPH_OPTION_SET_SUBPIXEL ); | |
if ( subpixel_hinting ) | |
grayscale = FALSE; | |
else if ( SPH_OPTION_SET_GRAYSCALE ) | |
{ | |
grayscale = TRUE; | |
subpixel_hinting = FALSE; | |
} | |
else | |
grayscale = FALSE; | |
if ( FT_IS_TRICKY( glyph->face ) ) | |
subpixel_hinting = FALSE; | |
exec->ignore_x_mode = subpixel_hinting || grayscale; | |
exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION; | |
if ( exec->sph_tweak_flags & SPH_TWEAK_RASTERIZER_35 ) | |
exec->rasterizer_version = TT_INTERPRETER_VERSION_35; | |
#if 1 | |
exec->compatible_widths = SPH_OPTION_SET_COMPATIBLE_WIDTHS; | |
exec->symmetrical_smoothing = TRUE; | |
exec->bgr = FALSE; | |
exec->vertical_lcd = FALSE; | |
exec->subpixel_positioned = TRUE; | |
exec->gray_cleartype = FALSE; | |
#else /* 0 */ | |
exec->compatible_widths = | |
FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != | |
TT_LOAD_COMPATIBLE_WIDTHS ); | |
exec->symmetrical_smoothing = | |
FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != | |
TT_LOAD_SYMMETRICAL_SMOOTHING ); | |
exec->bgr = | |
FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != | |
TT_LOAD_BGR ); | |
exec->vertical_lcd = | |
FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != | |
TT_LOAD_VERTICAL_LCD ); | |
exec->subpixel_positioned = | |
FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != | |
TT_LOAD_SUBPIXEL_POSITIONED ); | |
exec->gray_cleartype = | |
FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != | |
TT_LOAD_GRAY_CLEARTYPE ); | |
#endif /* 0 */ | |
} | |
else | |
#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ | |
{ | |
grayscale = FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != | |
FT_RENDER_MODE_MONO ); | |
} | |
error = TT_Load_Context( exec, face, size ); | |
if ( error ) | |
return error; | |
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING | |
if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 ) | |
{ | |
/* a change from mono to subpixel rendering (and vice versa) */ | |
/* requires a re-execution of the CVT program */ | |
if ( subpixel_hinting != exec->subpixel_hinting ) | |
{ | |
FT_TRACE4(( "tt_loader_init: subpixel hinting change," | |
" re-executing `prep' table\n" )); | |
exec->subpixel_hinting = subpixel_hinting; | |
reexecute = TRUE; | |
} | |
/* a change from mono to grayscale rendering (and vice versa) */ | |
/* requires a re-execution of the CVT program */ | |
if ( grayscale != exec->grayscale ) | |
{ | |
FT_TRACE4(( "tt_loader_init: grayscale hinting change," | |
" re-executing `prep' table\n" )); | |
exec->grayscale = grayscale; | |
reexecute = TRUE; | |
} | |
} | |
else | |
#endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */ | |
{ | |
/* a change from mono to grayscale rendering (and vice versa) */ | |
/* requires a re-execution of the CVT program */ | |
if ( grayscale != exec->grayscale ) | |
{ | |
FT_TRACE4(( "tt_loader_init: grayscale hinting change," | |
" re-executing `prep' table\n" )); | |
exec->grayscale = grayscale; | |
reexecute = TRUE; | |
} | |
} | |
if ( reexecute ) | |
{ | |
FT_UInt i; | |
for ( i = 0; i < size->cvt_size; i++ ) | |
size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale ); | |
error = tt_size_run_prep( size, pedantic ); | |
if ( error ) | |
return error; | |
} | |
/* check whether the cvt program has disabled hinting */ | |
if ( exec->GS.instruct_control & 1 ) | |
load_flags |= FT_LOAD_NO_HINTING; | |
/* load default graphics state -- if needed */ | |
if ( exec->GS.instruct_control & 2 ) | |
exec->GS = tt_default_graphics_state; | |
#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING | |
/* check whether we have a font hinted for ClearType -- */ | |
/* note that this flag can also be modified in a glyph's bytecode */ | |
if ( exec->GS.instruct_control & 4 ) | |
exec->ignore_x_mode = 0; | |
#endif | |
exec->pedantic_hinting = FT_BOOL( load_flags & FT_LOAD_PEDANTIC ); | |
loader->exec = exec; | |
loader->instructions = exec->glyphIns; | |
} | |
#endif /* TT_USE_BYTECODE_INTERPRETER */ | |
/* seek to the beginning of the glyph table -- for Type 42 fonts */ | |
/* the table might be accessed from a Postscript stream or something */ | |
/* else... */ | |
#ifdef FT_CONFIG_OPTION_INCREMENTAL | |
if ( face->root.internal->incremental_interface ) | |
loader->glyf_offset = 0; | |
else | |
#endif | |
{ | |
error = face->goto_table( face, TTAG_glyf, stream, 0 ); | |
if ( FT_ERR_EQ( error, Table_Missing ) ) | |
loader->glyf_offset = 0; | |
else if ( error ) | |
{ | |
FT_ERROR(( "tt_loader_init: could not access glyph table\n" )); | |
return error; | |
} | |
else | |
loader->glyf_offset = FT_STREAM_POS(); | |
} | |
/* get face's glyph loader */ | |
if ( !glyf_table_only ) | |
{ | |
FT_GlyphLoader gloader = glyph->internal->loader; | |
FT_GlyphLoader_Rewind( gloader ); | |
loader->gloader = gloader; | |
} | |
loader->load_flags = (FT_ULong)load_flags; | |
loader->face = face; | |
loader->size = size; | |
loader->glyph = (FT_GlyphSlot)glyph; | |
loader->stream = stream; | |
loader->composites.head = NULL; | |
loader->composites.tail = NULL; | |
return FT_Err_Ok; | |
} | |
static void | |
tt_loader_done( TT_Loader loader ) | |
{ | |
FT_List_Finalize( &loader->composites, | |
NULL, | |
loader->face->root.memory, | |
NULL ); | |
} | |
/*************************************************************************/ | |
/* */ | |
/* <Function> */ | |
/* TT_Load_Glyph */ | |
/* */ | |
/* <Description> */ | |
/* A function used to load a single glyph within a given glyph slot, */ | |
/* for a given size. */ | |
/* */ | |
/* <Input> */ | |
/* glyph :: A handle to a target slot object where the glyph */ | |
/* will be loaded. */ | |
/* */ | |
/* size :: A handle to the source face size at which the glyph */ | |
/* must be scaled/loaded. */ | |
/* */ | |
/* glyph_index :: The index of the glyph in the font file. */ | |
/* */ | |
/* load_flags :: A flag indicating what to load for this glyph. The */ | |
/* FT_LOAD_XXX constants can be used to control the */ | |
/* glyph loading process (e.g., whether the outline */ | |
/* should be scaled, whether to load bitmaps or not, */ | |
/* whether to hint the outline, etc). */ | |
/* */ | |
/* <Return> */ | |
/* FreeType error code. 0 means success. */ | |
/* */ | |
FT_LOCAL_DEF( FT_Error ) | |
TT_Load_Glyph( TT_Size size, | |
TT_GlyphSlot glyph, | |
FT_UInt glyph_index, | |
FT_Int32 load_flags ) | |
{ | |
FT_Error error; | |
TT_LoaderRec loader; | |
FT_TRACE1(( "TT_Load_Glyph: glyph index %d\n", glyph_index )); | |
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS | |
/* try to load embedded bitmap if any */ | |
/* */ | |
/* XXX: The convention should be emphasized in */ | |
/* the documents because it can be confusing. */ | |
if ( size->strike_index != 0xFFFFFFFFUL && | |
( load_flags & FT_LOAD_NO_BITMAP ) == 0 ) | |
{ | |
error = load_sbit_image( size, glyph, glyph_index, load_flags ); | |
if ( !error ) | |
{ | |
if ( FT_IS_SCALABLE( glyph->face ) ) | |
{ | |
/* for the bbox we need the header only */ | |
(void)tt_loader_init( &loader, size, glyph, load_flags, TRUE ); | |
(void)load_truetype_glyph( &loader, glyph_index, 0, TRUE ); | |
tt_loader_done( &loader ); | |
glyph->linearHoriAdvance = loader.linear; | |
glyph->linearVertAdvance = loader.vadvance; | |
/* sanity checks: if `xxxAdvance' in the sbit metric */ | |
/* structure isn't set, use `linearXXXAdvance' */ | |
if ( !glyph->metrics.horiAdvance && glyph->linearHoriAdvance ) | |
glyph->metrics.horiAdvance = | |
FT_MulFix( glyph->linearHoriAdvance, | |
size->root.metrics.x_scale ); | |
if ( !glyph->metrics.vertAdvance && glyph->linearVertAdvance ) | |
glyph->metrics.vertAdvance = | |
FT_MulFix( glyph->linearVertAdvance, | |
size->root.metrics.y_scale ); | |
} | |
return FT_Err_Ok; | |
} | |
} | |
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ | |
/* if FT_LOAD_NO_SCALE is not set, `ttmetrics' must be valid */ | |
if ( !( load_flags & FT_LOAD_NO_SCALE ) && !size->ttmetrics.valid ) | |
return FT_THROW( Invalid_Size_Handle ); | |
if ( load_flags & FT_LOAD_SBITS_ONLY ) | |
return FT_THROW( Invalid_Argument ); | |
error = tt_loader_init( &loader, size, glyph, load_flags, FALSE ); | |
if ( error ) | |
return error; | |
glyph->format = FT_GLYPH_FORMAT_OUTLINE; | |
glyph->num_subglyphs = 0; | |
glyph->outline.flags = 0; | |
/* main loading loop */ | |
error = load_truetype_glyph( &loader, glyph_index, 0, FALSE ); | |
if ( !error ) | |
{ | |
if ( glyph->format == FT_GLYPH_FORMAT_COMPOSITE ) | |
{ | |
glyph->num_subglyphs = loader.gloader->base.num_subglyphs; | |
glyph->subglyphs = loader.gloader->base.subglyphs; | |
} | |
else | |
{ | |
glyph->outline = loader.gloader->base.outline; | |
glyph->outline.flags &= ~FT_OUTLINE_SINGLE_PASS; | |
/* Translate array so that (0,0) is the glyph's origin. Note */ | |
/* that this behaviour is independent on the value of bit 1 of */ | |
/* the `flags' field in the `head' table -- at least major */ | |
/* applications like Acroread indicate that. */ | |
if ( loader.pp1.x ) | |
FT_Outline_Translate( &glyph->outline, -loader.pp1.x, 0 ); | |
} | |
#ifdef TT_USE_BYTECODE_INTERPRETER | |
if ( IS_HINTED( load_flags ) ) | |
{ | |
if ( loader.exec->GS.scan_control ) | |
{ | |
/* convert scan conversion mode to FT_OUTLINE_XXX flags */ | |
switch ( loader.exec->GS.scan_type ) | |
{ | |
case 0: /* simple drop-outs including stubs */ | |
glyph->outline.flags |= FT_OUTLINE_INCLUDE_STUBS; | |
break; | |
case 1: /* simple drop-outs excluding stubs */ | |
/* nothing; it's the default rendering mode */ | |
break; | |
case 4: /* smart drop-outs including stubs */ | |
glyph->outline.flags |= FT_OUTLINE_SMART_DROPOUTS | | |
FT_OUTLINE_INCLUDE_STUBS; | |
break; | |
case 5: /* smart drop-outs excluding stubs */ | |
glyph->outline.flags |= FT_OUTLINE_SMART_DROPOUTS; | |
break; | |
default: /* no drop-out control */ | |
glyph->outline.flags |= FT_OUTLINE_IGNORE_DROPOUTS; | |
break; | |
} | |
} | |
else | |
glyph->outline.flags |= FT_OUTLINE_IGNORE_DROPOUTS; | |
} | |
#endif /* TT_USE_BYTECODE_INTERPRETER */ | |
error = compute_glyph_metrics( &loader, glyph_index ); | |
} | |
tt_loader_done( &loader ); | |
/* Set the `high precision' bit flag. */ | |
/* This is _critical_ to get correct output for monochrome */ | |
/* TrueType glyphs at all sizes using the bytecode interpreter. */ | |
/* */ | |
if ( !( load_flags & FT_LOAD_NO_SCALE ) && | |
size->root.metrics.y_ppem < 24 ) | |
glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION; | |
return error; | |
} | |
/* END */ |