ref: 7eef5364b88b5884310d053a614c10bcc7cf0ded
dir: /src/type1/t1gload.c/
/*******************************************************************
*
* t1gload.c 1.0
*
* Type1 Glyph Loader.
*
* Copyright 1996-1999 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 <t1gload.h>
#include <ftdebug.h>
#include <ftstream.h>
#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
#include <t1hinter.h>
#endif
/**********************************************************************/
/**********************************************************************/
/**********************************************************************/
/********** *********/
/********** *********/
/********** GENERIC CHARSTRINGS PARSING *********/
/********** *********/
/********** *********/
/**********************************************************************/
/**********************************************************************/
/**********************************************************************/
/*********************************************************************
*
* <Function>
* T1_Init_Builder
*
* <Description>
* Initialise a given glyph builder.
*
* <Input>
* builder :: glyph builder to initialise
* face :: current face object
* size :: current size object
* glyph :: current glyph object
* funcs :: glyph builder functions (or "methods").
*
*********************************************************************/
EXPORT_FUNC
void T1_Init_Builder( T1_Builder* builder,
T1_Face face,
T1_Size size,
T1_GlyphSlot glyph,
const T1_Builder_Funcs* funcs )
{
builder->funcs = *funcs;
builder->path_begun = 0;
builder->load_points = 1;
builder->face = face;
builder->size = size;
builder->glyph = glyph;
builder->memory = face->root.memory;
if (glyph)
{
builder->base = glyph->root.outline;
builder->max_points = glyph->max_points;
builder->max_contours = glyph->max_contours;
}
if (size)
{
builder->scale_x = size->root.metrics.x_scale;
builder->scale_y = size->root.metrics.y_scale;
}
builder->pos_x = 0;
builder->pos_y = 0;
builder->left_bearing.x = 0;
builder->left_bearing.y = 0;
builder->advance.x = 0;
builder->advance.y = 0;
builder->base.n_points = 0;
builder->base.n_contours = 0;
builder->current = builder->base;
builder->pass = 0;
builder->hint_point = 0;
}
/*********************************************************************
*
* <Function>
* T1_Done_Builder
*
* <Description>
* Finalise a given glyph builder. Its content can still be
* used after the call, but the function saves important information
* within the corresponding glyph slot.
*
* <Input>
* builder :: glyph builder to initialise
*
*********************************************************************/
EXPORT_FUNC
void T1_Done_Builder( T1_Builder* builder )
{
T1_GlyphSlot glyph = builder->glyph;
if (glyph)
{
glyph->root.outline = builder->base;
glyph->max_points = builder->max_points;
glyph->max_contours = builder->max_contours;
}
}
/*********************************************************************
*
* <Function>
* T1_Init_Decoder
*
* <Description>
* Initialise a given Type 1 decoder for parsing
*
* <Input>
* decoder :: Type 1 decoder to initialise
* funcs :: hinter functions interface
*
*********************************************************************/
EXPORT_FUNC
void T1_Init_Decoder( T1_Decoder* decoder,
const T1_Hinter_Funcs* funcs )
{
decoder->hinter = *funcs; /* copy hinter interface */
decoder->top = 0;
decoder->zone = 0;
decoder->flex_state = 0;
decoder->num_flex_vectors = 0;
/* Clear loader */
MEM_Set( &decoder->builder, 0, sizeof(decoder->builder) );
}
/*********************************************************************
*
* <Function>
* lookup_glyph_by_stdcharcode
*
* <Description>
* Lookup a given glyph by its StandardEncoding charcode. Used
* to implement the SEAC Type 1 operator.
*
* <Input>
* face :: current face object
* charcode :: charcode to look for
*
* <Return>
* glyph index in font face. Returns -1 if the corresponding
* glyph wasn't found.
*
*********************************************************************/
static
T1_Int lookup_glyph_by_stdcharcode( T1_Face face,
T1_Int charcode )
{
T1_Int n;
const T1_String* glyph_name;
PSNames_Interface* psnames = (PSNames_Interface*)face->psnames;
/* check range of standard char code */
if (charcode < 0 || charcode > 255)
return -1;
glyph_name = psnames->adobe_std_strings(
psnames->adobe_std_encoding[charcode]);
for ( n = 0; n < face->type1.num_glyphs; n++ )
{
T1_String* name = (T1_String*)face->type1.glyph_names[n];
if ( name && strcmp(name,glyph_name) == 0 )
return n;
}
return -1;
}
/*********************************************************************
*
* <Function>
* t1operator_seac
*
* <Description>
* Implements the "seac" Type 1 operator for a Type 1 decoder
*
* <Input>
* decoder :: current Type 1 decoder
* asb :: accent's side bearing
* adx :: horizontal position of accent
* ady :: vertical position of accent
* bchar :: base character's StandardEncoding charcode
* achar :: accent character's StandardEncoding charcode
*
* <Return>
* Error code. 0 means success.
*
*********************************************************************/
static
T1_Error t1operator_seac( T1_Decoder* decoder,
T1_Pos asb,
T1_Pos adx,
T1_Pos ady,
T1_Int bchar,
T1_Int achar )
{
T1_Error error;
T1_Face face = decoder->builder.face;
T1_Int bchar_index, achar_index, n_base_points;
FT_Outline* cur = &decoder->builder.current;
FT_Outline* base = &decoder->builder.base;
T1_Vector left_bearing, advance;
T1_Font* type1 = &face->type1;
bchar_index = lookup_glyph_by_stdcharcode( face, bchar );
achar_index = lookup_glyph_by_stdcharcode( face, achar );
if (bchar_index < 0 || achar_index < 0)
{
FT_ERROR(( "T1.Parse_Seac : invalid seac character code arguments\n" ));
return T1_Err_Syntax_Error;
}
/* First load "bchar" in builder */
/* now load the unscaled outline */
cur->n_points = 0;
cur->n_contours = 0;
cur->points = base->points + base->n_points;
cur->flags = base->flags + base->n_points;
cur->contours = base->contours + base->n_contours;
error = T1_Parse_CharStrings( decoder,
type1->charstrings [bchar_index],
type1->charstrings_len[bchar_index],
type1->num_subrs,
type1->subrs,
type1->subrs_len );
if (error) return error;
n_base_points = cur->n_points;
/* save the left bearing and width of the base character */
/* as they will be erased by the next load.. */
left_bearing = decoder->builder.left_bearing;
advance = decoder->builder.advance;
decoder->builder.left_bearing.x = 0;
decoder->builder.left_bearing.y = 0;
/* Now load "achar" on top of */
/* the base outline */
/* */
cur->n_points = 0;
cur->n_contours = 0;
cur->points = base->points + base->n_points;
cur->flags = base->flags + base->n_points;
cur->contours = base->contours + base->n_contours;
error = T1_Parse_CharStrings( decoder,
type1->charstrings [achar_index],
type1->charstrings_len[achar_index],
type1->num_subrs,
type1->subrs,
type1->subrs_len );
if (error) return error;
/* adjust contours in accented character outline */
{
T1_Int n;
for ( n = 0; n < cur->n_contours; n++ )
cur->contours[n] += n_base_points;
}
/* restore the left side bearing and */
/* advance width of the base character */
decoder->builder.left_bearing = left_bearing;
decoder->builder.advance = advance;
/* Finally, move the accent */
FT_Translate_Outline( cur, adx - asb, ady );
(void)asb; /* ignore this parameter */
return T1_Err_Ok;
}
/*********************************************************************
*
* <Function>
* t1operator_flex
*
* <Description>
* Implements the "flex" Type 1 operator for a Type 1 decoder
*
* <Input>
* decoder :: current Type 1 decoder
* threshold :: threshold
* end_x :: position of final flex point
* end_y :: position of final flex point
*
* <Return>
* Error code. 0 means success.
*
*********************************************************************/
static
T1_Error t1operator_flex( T1_Decoder* decoder,
T1_Pos threshold,
T1_Pos end_x,
T1_Pos end_y )
{
T1_Vector vec;
T1_Vector* flex = decoder->flex_vectors;
T1_Int n;
/* we don't even try to test the threshold in the non-hinting */
/* builder, even if the flex operator is said to be a path */
/* construction statement in the specification. This is better */
/* left to the hinter.. */
flex = decoder->flex_vectors;
vec = *flex++;
for ( n = 0; n < 6; n++ )
{
flex->x += vec.x;
flex->y += vec.y;
vec = *flex++;
}
(void)threshold;
(void)end_x;
(void)end_y;
flex = decoder->flex_vectors;
return decoder->builder.funcs.rcurve_to( &decoder->builder,
flex[0].x, flex[0].y,
flex[1].x, flex[1].y,
flex[2].x, flex[2].y ) ||
decoder->builder.funcs.rcurve_to( &decoder->builder,
flex[3].x, flex[3].y,
flex[4].x, flex[4].y,
flex[5].x, flex[5].y );
}
/*********************************************************************
*
* <Function>
* T1_Parse_CharStrings
*
* <Description>
* Parses a given Type 1 charstrings program
*
* <Input>
* decoder :: current Type 1 decoder
* charstring_base :: base of the charstring stream
* charstring_len :: length in bytes of the charstring stream
* num_subrs :: number of sub-routines
* subrs_base :: array of sub-routines addresses
* subrs_len :: array of sub-routines lengths
*
* <Return>
* Error code. 0 means success.
*
*********************************************************************/
EXPORT_FUNC
T1_Error T1_Parse_CharStrings( T1_Decoder* decoder,
T1_Byte* charstring_base,
T1_Int charstring_len,
T1_Int num_subrs,
T1_Byte** subrs_base,
T1_Int* subrs_len )
{
T1_Error error;
T1_Decoder_Zone* zone;
T1_Byte* ip;
T1_Byte* limit;
T1_Builder* builder = &decoder->builder;
T1_Builder_Funcs* builds = &builder->funcs;
T1_Hinter_Funcs* hints = &decoder->hinter;
static const T1_Int args_count[ op_max ] =
{
0, /* none */
0, /* endchar */
2, /* hsbw */
5, /* seac */
4, /* sbw */
0, /* closepath */
1, /* hlineto */
1, /* hmoveto */
4, /* hvcurveto */
2, /* rlineto */
2, /* rmoveto */
6, /* rrcurveto */
4, /* vhcurveto */
1, /* vlineto */
1, /* vmoveto */
0, /* dotsection */
2, /* hstem */
6, /* hstem3 */
2, /* vstem */
6, /* vstem3 */
2, /* div */
-1, /* callothersubr */
1, /* callsubr */
0, /* pop */
0, /* return */
2 /* setcurrentpoint */
};
/* First of all, initialise the decoder */
decoder->top = decoder->stack;
decoder->zone = decoder->zones;
zone = decoder->zones;
builder->path_begun = 0;
zone->base = charstring_base;
limit = zone->limit = charstring_base + charstring_len;
ip = zone->cursor = zone->base;
error = T1_Err_Ok;
/* now, execute loop */
while ( ip < limit )
{
T1_Int* top = decoder->top;
T1_Operator op = op_none;
T1_Long value = 0;
/* First of all, decompress operator or value */
switch (*ip++)
{
case 1: op = op_hstem; break;
case 3: op = op_vstem; break;
case 4: op = op_vmoveto; break;
case 5: op = op_rlineto; break;
case 6: op = op_hlineto; break;
case 7: op = op_vlineto; break;
case 8: op = op_rrcurveto; break;
case 9: op = op_closepath; break;
case 10: op = op_callsubr; break;
case 11: op = op_return; break;
case 13: op = op_hsbw; break;
case 14: op = op_endchar; break;
case 21: op = op_rmoveto; break;
case 22: op = op_hmoveto; break;
case 30: op = op_vhcurveto; break;
case 31: op = op_hvcurveto; break;
case 12:
{
if (ip > limit)
{
FT_ERROR(( "T1.Parse_CharStrings : invalid escape (12+EOF)\n" ));
goto Syntax_Error;
}
switch (*ip++)
{
case 0: op = op_dotsection; break;
case 1: op = op_vstem3; break;
case 2: op = op_hstem3; break;
case 6: op = op_seac; break;
case 7: op = op_sbw; break;
case 12: op = op_div; break;
case 16: op = op_callothersubr; break;
case 17: op = op_pop; break;
case 33: op = op_setcurrentpoint; break;
default:
FT_ERROR(( "T1.Parse_CharStrings : invalid escape (12+%d)\n",
ip[-1] ));
goto Syntax_Error;
}
}
break;
case 255: /* four bytes integer */
{
if (ip+4 > limit)
{
FT_ERROR(( "T1.Parse_CharStrings : unexpected EOF in integer\n" ));
goto Syntax_Error;
}
value = ((long)ip[0] << 24) |
((long)ip[1] << 16) |
((long)ip[2] << 8) |
ip[3];
ip += 4;
}
break;
default:
if (ip[-1] >= 32)
{
if (ip[-1] < 247)
value = (long)ip[-1] - 139;
else
{
if (++ip > limit)
{
FT_ERROR(( "T1.Parse_CharStrings : unexpected EOF in integer\n" ));
goto Syntax_Error;
}
if (ip[-2] < 251)
value = ((long)(ip[-2]-247) << 8) + ip[-1] + 108;
else
value = -((((long)ip[-2]-251) << 8) + ip[-1] + 108 );
}
}
else
{
FT_ERROR(( "T1.Parse_CharStrings : invalid byte (%d)\n",
ip[-1] ));
goto Syntax_Error;
}
}
/* push value if needed */
if ( op == op_none )
{
if ( top - decoder->stack >= T1_MAX_CHARSTRINGS_OPERANDS )
{
FT_ERROR(( "T1.Parse_CharStrings : Stack overflow !!\n" ));
goto Syntax_Error;
}
*top++ = value;
decoder->top = top;
}
else if ( op == op_callothersubr ) /* check arguments differently */
{
if ( top - decoder->stack < 2)
goto Stack_Underflow;
top -= 2;
switch (top[1])
{
case 1: /* start flex feature ----------------------------- */
{
if (top[0] != 0) goto Unexpected_OtherSubr;
decoder->flex_state = 1;
decoder->num_flex_vectors = 0;
decoder->flex_vectors[0].x = 0;
decoder->flex_vectors[0].y = 0;
}
break;
case 2: /* add flex vector ------------------------------- */
{
T1_Int index;
T1_Vector* flex;
if (top[0] != 0) goto Unexpected_OtherSubr;
top -= 2;
if (top < decoder->stack) goto Stack_Underflow;
index = decoder->num_flex_vectors++;
if (index >= 7)
{
FT_ERROR(( "T1.Parse_CharStrings: too many flex vectors !\n" ));
goto Syntax_Error;
}
flex = decoder->flex_vectors + index;
flex->x += top[0];
flex->y += top[1];
}
break;
case 0: /* end flex feature ------------------------------ */
{
if ( decoder->flex_state == 0 ||
decoder->num_flex_vectors != 7 )
{
FT_ERROR(( "T1.Parse_CharStrings: unexpected flex end\n" ));
goto Syntax_Error;
}
if (top[0] != 3) goto Unexpected_OtherSubr;
top -= 3;
if (top < decoder->stack) goto Stack_Underflow;
/* now consume the remaining "pop pop setcurrentpoint" */
if ( ip+6 > limit ||
ip[0] != 12 || ip[1] != 17 || /* pop */
ip[2] != 12 || ip[3] != 17 || /* pop */
ip[4] != 12 || ip[5] != 33 ) /* setcurrentpoint */
{
FT_ERROR(( "T1.Parse_CharStrings: invalid flex charstring\n" ));
goto Syntax_Error;
}
decoder->flex_state = 0;
decoder->top = top;
error = t1operator_flex( decoder, top[0], top[1], top[2] );
}
break;
case 3: /* change hints ------------------------------------ */
{
if (top[0] != 1) goto Unexpected_OtherSubr;
/* eat the following "pop" */
if (ip+2 > limit)
{
FT_ERROR(( "T1.Parse_CharStrings: invalid escape (12+%d)\n",
ip[-1] ));
goto Syntax_Error;
}
if (ip[0] != 12 || ip[1] != 17)
{
FT_ERROR(( "T1.Parse_CharStrings: 'pop' expected, found (%d %d)\n",
ip[0], ip[1] ));
goto Syntax_Error;
}
ip += 2;
error = hints->change_hints(builder);
}
break;
default:
/* invalid OtherSubrs call */
Unexpected_OtherSubr:
FT_ERROR(( "T1.Parse_CharStrings: unexpected OtherSubrs [%d %d]\n",
top[0], top[1] ));
goto Syntax_Error;
}
decoder->top = top;
}
else
{
T1_Int num_args = args_count[op];
if ( top - decoder->stack < num_args )
goto Stack_Underflow;
top -= num_args;
switch (op)
{
case op_endchar:
error = builds->end_char( builder );
break;
case op_hsbw:
error = builds->set_bearing_point( builder, top[0], 0,
top[1], 0 );
break;
case op_seac:
/* return immediately after the processing */
return t1operator_seac( decoder, top[0], top[1],
top[2], top[3], top[4] );
case op_sbw:
error = builds->set_bearing_point( builder, top[0], top[1],
top[2], top[3] );
break;
case op_closepath:
error = builds->close_path( builder );
break;
case op_hlineto:
error = builds->rline_to( builder, top[0], 0 );
break;
case op_hmoveto:
error = builds->rmove_to( builder, top[0], 0 );
break;
case op_hvcurveto:
error = builds->rcurve_to( builder, top[0], 0,
top[1], top[2],
0, top[3] );
break;
case op_rlineto:
error = builds->rline_to( builder, top[0], top[1] );
break;
case op_rmoveto:
/* ignore operator when in flex mode */
if (decoder->flex_state == 0)
error = builds->rmove_to( builder, top[0], top[1] );
else
top += 2;
break;
case op_rrcurveto:
{
error = builds->rcurve_to( builder, top[0], top[1],
top[2], top[3],
top[4], top[5] );
}
break;
case op_vhcurveto:
error = builds->rcurve_to( builder, 0, top[0],
top[1], top[2],
top[3], 0 );
break;
case op_vlineto:
error = builds->rline_to( builder, 0, top[0] );
break;
case op_vmoveto:
error = builds->rmove_to( builder, 0, top[0] );
break;
case op_dotsection:
error = hints->dot_section( builder );
break;
case op_hstem:
error = hints->stem( builder, top[0], top[1], 0 );
break;
case op_hstem3:
error = hints->stem3( builder, top[0], top[1], top[2],
top[3], top[4], top[5], 0 );
break;
case op_vstem:
error = hints->stem( builder, top[0], top[1], 1 );
break;
case op_vstem3:
error = hints->stem3( builder, top[0], top[1], top[2],
top[3], top[4], top[5], 1 );
break;
case op_div:
if (top[1])
*top++ = top[0] / top[1];
else
{
FT_ERROR(( "T1.Parse_CHarStrings : division by 0\n" ));
goto Syntax_Error;
}
break;
case op_callsubr:
{
T1_Int index = top[0];
if ( index < 0 || index >= num_subrs )
{
FT_ERROR(( "T1.Parse_CharStrings : invalid subrs index\n" ));
goto Syntax_Error;
}
if ( zone - decoder->zones >= T1_MAX_SUBRS_CALLS )
{
FT_ERROR(( "T1.Parse_CharStrings : too many nested subrs\n" ));
goto Syntax_Error;
}
zone->cursor = ip; /* save current instruction pointer */
zone++;
zone->base = subrs_base[index];
zone->limit = zone->base + subrs_len[index];
zone->cursor = zone->base;
if (!zone->base)
{
FT_ERROR(( "T1.Parse_CharStrings : invoking empty subrs !!\n" ));
goto Syntax_Error;
}
decoder->zone = zone;
ip = zone->base;
limit = zone->limit;
}
break;
case op_pop:
FT_ERROR(( "T1.Parse_CharStrings : unexpected POP\n" ));
goto Syntax_Error;
case op_return:
if ( zone <= decoder->zones )
{
FT_ERROR(( "T1.Parse_CharStrings : unexpected return\n" ));
goto Syntax_Error;
}
zone--;
ip = zone->cursor;
limit = zone->limit;
decoder->zone = zone;
break;
case op_setcurrentpoint:
FT_ERROR(( "T1.Parse_CharStrings : unexpected SETCURRENTPOINT\n" ));
goto Syntax_Error;
break;
default:
FT_ERROR(( "T1.Parse_CharStrings : unhandled opcode %d\n", op ));
goto Syntax_Error;
}
decoder->top = top;
}
}
return error;
Syntax_Error:
return T1_Err_Syntax_Error;
Stack_Underflow:
return T1_Err_Stack_Underflow;
}
/*************************************************************************/
/* */
/* <Function> T1_Add_Points */
/* */
/* <Description> */
/* Checks that there is enough room in the current load glyph outline */
/* to accept "num_points" additional outline points. If not, this */
/* function grows the load outline's arrays accordingly.. */
/* */
/* <Input> */
/* builder :: pointer to glyph builder object */
/* num_points :: number of points that will be added later */
/* */
/* <Return> */
/* Type1 error code. 0 means success */
/* */
/* <Note> */
/* This function does NOT update the points count in the glyph builder*/
/* This must be done by the caller itself, after this function is */
/* invoked.. */
/* */
LOCAL_FUNC
T1_Error T1_Add_Points( T1_Builder* builder,
T1_Int num_points )
{
T1_Int new_points;
new_points = builder->base.n_points +
builder->current.n_points +
num_points;
if ( new_points > builder->max_points )
{
FT_Memory memory = builder->memory;
T1_Error error;
T1_Int increment = builder->current.points - builder->base.points;
T1_Int current = builder->max_points;
while ( builder->max_points < new_points )
builder->max_points += 16;
if ( REALLOC_ARRAY( builder->base.points,
current, builder->max_points, T1_Vector ) ||
REALLOC_ARRAY( builder->base.flags,
current, builder->max_points, T1_Byte ) )
return error;
builder->current.points = builder->base.points + increment;
builder->current.flags = builder->base.flags + increment;
}
return T1_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> T1_Add_Contours */
/* */
/* <Description> */
/* Checks that there is enough room in the current load glyph outline */
/* to accept "num_contours" additional contours. If not, this func */
/* the load outline's arrays accordingly.. */
/* */
/* <Input> */
/* builder :: pointer to glyph builder object */
/* num_contours :: number of contours that will be added later */
/* */
/* <Return> */
/* Type1 error code. 0 means success */
/* */
/* <Note> */
/* This function does NOT update the contours count in the load glyph */
/* This must be done by the caller itself, after this function is */
/* invoked.. */
/* */
LOCAL_FUNC
T1_Error T1_Add_Contours( T1_Builder* builder,
T1_Int num_contours )
{
T1_Int new_contours;
new_contours = builder->base.n_contours +
builder->current.n_contours +
num_contours;
if ( new_contours > builder->max_contours && builder->load_points )
{
T1_Error error;
FT_Memory memory = builder->memory;
T1_Int increment = builder->current.contours - builder->base.contours;
T1_Int current = builder->max_contours;
while ( builder->max_contours < new_contours )
builder->max_contours += 4;
if ( REALLOC_ARRAY( builder->base.contours,
current, builder->max_contours, T1_Short ) )
return error;
builder->current.contours = builder->base.contours + increment;
}
return T1_Err_Ok;
}
/**********************************************************************/
/**********************************************************************/
/**********************************************************************/
/********** *********/
/********** *********/
/********** COMPUTE THE MAXIMUM ADVANCE WIDTH *********/
/********** *********/
/********** The following code is in charge of computing *********/
/********** the maximum advance width of the font. It *********/
/********** quickly process each glyph charstring to *********/
/********** extract the value from either a "sbw" or "seac" *********/
/********** operator. *********/
/********** *********/
/**********************************************************************/
/**********************************************************************/
/**********************************************************************/
static
T1_Error maxadv_sbw( T1_Decoder* decoder,
T1_Pos sbx,
T1_Pos sby,
T1_Pos wx,
T1_Pos wy )
{
if (wx > decoder->builder.advance.x)
decoder->builder.advance.x = wx;
(void)sbx;
(void)sby;
(void)wy;
return -1; /* return an error code to exit the Type 1 parser */
/* immediately. */
}
static
T1_Int maxadv_error( void )
{
/* we should never reach this code, unless with a buggy font */
return -2;
}
/* the maxadv_gbuilder_interface is used when computing the maximum */
/* advance width of all glyphs in a given font. We only process the */
/* 'sbw' operator here, and return an error for all others.. */
/* Note that "seac" is processed by the T1_Decoder */
static
const T1_Builder_Funcs maxadv_builder_interface =
{
(T1_Builder_EndChar) maxadv_error,
(T1_Builder_Sbw) maxadv_sbw,
(T1_Builder_ClosePath) maxadv_error,
(T1_Builder_RLineTo) maxadv_error,
(T1_Builder_RMoveTo) maxadv_error,
(T1_Builder_RCurveTo) maxadv_error
};
/* the maxadv_interface is used when computing the maximum advance */
/* with of the set of glyphs in a given font file. We only process */
/* the "seac" operator and return immediately.. */
static
const T1_Hinter_Funcs maxadv_hinter_interface =
{
(T1_Hinter_DotSection) maxadv_error,
(T1_Hinter_ChangeHints) maxadv_error,
(T1_Hinter_Stem) maxadv_error,
(T1_Hinter_Stem3) maxadv_error,
};
LOCAL_FUNC
T1_Error T1_Compute_Max_Advance( T1_Face face,
T1_Int *max_advance )
{
T1_Error error;
T1_Decoder decoder;
T1_Int glyph_index;
T1_Font* type1 = &face->type1;
*max_advance = 0;
/* Initialise load decoder */
T1_Init_Decoder( &decoder, &maxadv_hinter_interface );
T1_Init_Builder( &decoder.builder, face, 0, 0,
&maxadv_builder_interface );
/* For each glyph, parse the glyph charstring and extract */
/* the advance width.. */
for ( glyph_index = 0; glyph_index < type1->num_glyphs; glyph_index++ )
{
/* now get load the unscaled outline */
error = T1_Parse_CharStrings( &decoder,
type1->charstrings [glyph_index],
type1->charstrings_len[glyph_index],
type1->num_subrs,
type1->subrs,
type1->subrs_len );
/* ignore the error if one occured - skip to next glyph */
(void)error;
}
*max_advance = decoder.builder.advance.x;
return T1_Err_Ok;
}
/**********************************************************************/
/**********************************************************************/
/**********************************************************************/
/********** *********/
/********** *********/
/********** UNHINTED GLYPH LOADER *********/
/********** *********/
/********** The following code is in charge of loading a *********/
/********** single outline. It completely ignores hinting *********/
/********** and is used when FT_LOAD_NO_HINTING is set. *********/
/********** *********/
/********** The Type 1 hinter is located in "t1hint.c" *********/
/********** *********/
/**********************************************************************/
/**********************************************************************/
/**********************************************************************/
static
T1_Error close_open_path( T1_Builder* builder )
{
T1_Error error;
FT_Outline* cur = &builder->current;
T1_Int num_points;
T1_Int first_point;
/* Some fonts, like Hershey, are made of "open paths" which are */
/* now managed directly by FreeType. In this case, it is necessary */
/* to close the path by duplicating its points in reverse order, */
/* which is precisely the purpose of this function */
/* first compute the number of points to duplicate.. */
if (cur->n_contours > 1)
first_point = cur->contours[ cur->n_contours-2 ]+1;
else
first_point = 0;
num_points = cur->n_points - first_point - 2;
if ( num_points > 0 )
{
T1_Vector* source_point;
char* source_flags;
T1_Vector* point;
char* flags;
error = T1_Add_Points( builder, num_points );
if (error) return error;
point = cur->points + cur->n_points;
flags = cur->flags + cur->n_points;
source_point = point - 2;
source_flags = flags - 2;
cur->n_points += num_points;
if ( builder->load_points )
do
{
*point++ = *source_point--;
*flags++ = *source_flags--;
num_points--;
}
while (num_points > 0);
}
builder->path_begun = 0;
return T1_Err_Ok;
}
static
T1_Error gload_closepath( T1_Builder* builder )
{
FT_Outline* cur = &builder->current;
/* save current contour, if any */
if ( cur->n_contours > 0 )
cur->contours[cur->n_contours-1] = cur->n_points-1;
#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
/* hint latest points if needed - this is not strictly required */
/* there, but it helps for debugging, and doesn't affect performance */
if ( builder->pass == 1 )
T1_Hint_Points( builder );
#endif
builder->path_begun = 0;
return T1_Err_Ok;
}
static
T1_Error gload_endchar( T1_Builder* builder )
{
FT_Outline* cur = &builder->current;
T1_Error error;
/* close path if needed */
if (builder->path_begun)
{
error = close_open_path( builder );
if (error) return error;
}
error = gload_closepath( builder );
builder->base.n_points += cur->n_points;
builder->base.n_contours += cur->n_contours;
return error;
}
static
T1_Error gload_sbw( T1_Builder* builder,
T1_Pos sbx,
T1_Pos sby,
T1_Pos wx,
T1_Pos wy )
{
builder->left_bearing.x += sbx;
builder->left_bearing.y += sby;
builder->advance.x = wx;
builder->advance.y = wy;
builder->last.x = sbx;
builder->last.y = sby;
return 0;
}
static
T1_Error gload_rlineto( T1_Builder* builder,
T1_Pos dx,
T1_Pos dy )
{
T1_Error error;
FT_Outline* cur = &builder->current;
T1_Vector vec;
/* grow buffer if necessary */
error = T1_Add_Points ( builder, 1 );
if (error) return error;
if ( builder->load_points )
{
/* save point */
vec.x = builder->last.x + dx;
vec.y = builder->last.y + dy;
cur->points[cur->n_points] = vec;
cur->flags [cur->n_points] = FT_Curve_Tag_On;
builder->last = vec;
}
cur->n_points++;
builder->path_begun = 1;
return T1_Err_Ok;
}
static
T1_Error gload_rmoveto( T1_Builder* builder,
T1_Pos dx,
T1_Pos dy )
{
T1_Error error;
FT_Outline* cur = &builder->current;
T1_Vector vec;
/* in the case where "path_begun" is set, we have a rmoveto */
/* after some normal path definition. When the face's paint */
/* type is set to 1, this means that we have an "open path", */
/* also called a 'stroke'. The FreeType raster doesn't support */
/* opened path, so we'll close it explicitely there.. */
if ( builder->path_begun && builder->face->type1.paint_type == 1 )
{
if ( builder->face->type1.paint_type == 1 )
{
error = close_open_path( builder );
if (error) return error;
}
}
/* grow buffer if necessary */
error = T1_Add_Contours( builder, 1 ) ||
T1_Add_Points ( builder, 1 );
if (error) return error;
/* save current contour, if any */
if ( cur->n_contours > 0 )
cur->contours[cur->n_contours-1] = cur->n_points-1;
if ( builder->load_points )
{
/* save point */
vec.x = builder->last.x + dx;
vec.y = builder->last.y + dy;
cur->points[cur->n_points] = vec;
cur->flags [cur->n_points] = FT_Curve_Tag_On;
builder->last = vec;
}
cur->n_contours++;
cur->n_points++;
return T1_Err_Ok;
}
static
T1_Error gload_rrcurveto( T1_Builder* builder,
T1_Pos dx1,
T1_Pos dy1,
T1_Pos dx2,
T1_Pos dy2,
T1_Pos dx3,
T1_Pos dy3 )
{
T1_Error error;
FT_Outline* cur = &builder->current;
T1_Vector vec;
T1_Vector* points;
char* flags;
/* grow buffer if necessary */
error = T1_Add_Points ( builder, 3 );
if (error) return error;
if ( builder->load_points )
{
/* save point */
points = cur->points + cur->n_points;
flags = cur->flags + cur->n_points;
vec.x = builder->last.x + dx1;
vec.y = builder->last.y + dy1;
points[0] = vec; flags[0] = FT_Curve_Tag_Cubic;
vec.x += dx2;
vec.y += dy2;
points[1] = vec; flags[1] = FT_Curve_Tag_Cubic;
vec.x += dx3;
vec.y += dy3;
points[2] = vec; flags[2] = FT_Curve_Tag_On;
builder->last = vec;
}
cur->n_points += 3;
builder->path_begun = 1;
return T1_Err_Ok;
}
static
T1_Error gload_ignore( void )
{
return 0;
}
static
const T1_Builder_Funcs gload_builder_interface =
{
gload_endchar,
gload_sbw,
gload_closepath,
gload_rlineto,
gload_rmoveto,
gload_rrcurveto
};
static
const T1_Builder_Funcs gload_builder_interface_null =
{
(T1_Builder_EndChar) gload_ignore,
(T1_Builder_Sbw) gload_sbw, /* record left bearing */
(T1_Builder_ClosePath) gload_ignore,
(T1_Builder_RLineTo) gload_ignore,
(T1_Builder_RMoveTo) gload_ignore,
(T1_Builder_RCurveTo) gload_ignore
};
static
const T1_Hinter_Funcs gload_hinter_interface =
{
(T1_Hinter_DotSection) gload_ignore, /* dotsection */
(T1_Hinter_ChangeHints) gload_ignore, /* changehints */
(T1_Hinter_Stem) gload_ignore, /* hstem & vstem */
(T1_Hinter_Stem3) gload_ignore, /* hstem3 & vestem3 */
};
LOCAL_FUNC
T1_Error T1_Load_Glyph( T1_GlyphSlot glyph,
T1_Size size,
T1_Int glyph_index,
T1_Int load_flags )
{
T1_Error error;
T1_Decoder decoder;
T1_Face face = (T1_Face)glyph->root.face;
T1_Bool hinting;
T1_Font* type1 = &face->type1;
glyph->x_scale = size->root.metrics.x_scale;
glyph->y_scale = size->root.metrics.y_scale;
glyph->root.outline.n_points = 0;
glyph->root.outline.n_contours = 0;
glyph->root.format = ft_glyph_format_none;
hinting = 0;
#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
/*****************************************************************/
/* */
/* Hinter overview : */
/* */
/* This is a two-pass hinter. On the first pass, the hints */
/* are all recorded by the hinter, and no point is loaded */
/* in the outline. */
/* */
/* When the first pass is finished, all stems hints are */
/* grid-fitted at once. */
/* */
/* Then, a second pass is performed to load the outline */
/* points as well as hint/scale them correctly. */
/* */
hinting = (load_flags & (FT_LOAD_NO_SCALE|FT_LOAD_NO_HINTING)) == 0;
if ( hinting )
{
/* Pass 1 - don't record points, simply stem hints */
T1_Init_Decoder( &decoder, &t1_hinter_funcs );
T1_Init_Builder( &decoder.builder, face, size, glyph,
&gload_builder_interface_null );
glyph->hints->hori_stems.num_stems = 0;
glyph->hints->vert_stems.num_stems = 0;
error = T1_Parse_CharStrings( &decoder,
type1->charstrings [glyph_index],
type1->charstrings_len[glyph_index],
type1->num_subrs,
type1->subrs,
type1->subrs_len );
/* All right, pass 1 is finished, now grid-fit all stem hints */
T1_Hint_Stems( &decoder.builder );
/* Pass 2 - record and scale/hint the points */
T1_Init_Decoder( &decoder, &t1_hinter_funcs );
T1_Init_Builder( &decoder.builder, face, size, glyph,
&gload_builder_interface );
decoder.builder.pass = 1;
error = T1_Parse_CharStrings( &decoder,
type1->charstrings [glyph_index],
type1->charstrings_len[glyph_index],
type1->num_subrs,
type1->subrs,
type1->subrs_len );
/* save new glyph tables */
T1_Done_Builder( &decoder.builder );
}
else
#endif
{
T1_Init_Decoder( &decoder, &gload_hinter_interface );
T1_Init_Builder( &decoder.builder, face, size, glyph,
&gload_builder_interface );
/* now load the unscaled outline */
error = T1_Parse_CharStrings( &decoder,
type1->charstrings [glyph_index],
type1->charstrings_len[glyph_index],
type1->num_subrs,
type1->subrs,
type1->subrs_len );
/* save new glyph tables */
T1_Done_Builder( &decoder.builder );
}
/* Now, set the metrics.. - this is rather simple, as : */
/* the left side bearing is the xMin, and the top side */
/* bearing the yMax.. */
if (!error)
{
FT_BBox cbox;
FT_Glyph_Metrics* metrics = &glyph->root.metrics;
FT_Get_Outline_CBox( &glyph->root.outline, &cbox );
/* grid fit the bounding box if necessary */
if (hinting)
{
cbox.xMin &= -64;
cbox.yMin &= -64;
cbox.xMax = ( cbox.xMax+63 ) & -64;
cbox.yMax = ( cbox.yMax+63 ) & -64;
}
metrics->width = cbox.xMax - cbox.xMin;
metrics->height = cbox.yMax - cbox.yMin;
metrics->horiBearingX = cbox.xMin;
metrics->horiBearingY = cbox.yMax;
/* copy the _unscaled_ advance width */
metrics->horiAdvance = decoder.builder.advance.x;
/* make up vertical metrics */
metrics->vertBearingX = 0;
metrics->vertBearingY = 0;
metrics->vertAdvance = 0;
glyph->root.format = ft_glyph_format_outline;
glyph->root.outline.second_pass = TRUE;
glyph->root.outline.high_precision = ( size->root.metrics.y_ppem < 24 );
glyph->root.outline.dropout_mode = 2;
if ( hinting )
{
/* adjust the advance width */
/* XXX : TODO : consider stem hints grid-fit */
metrics->horiAdvance = FT_MulFix( metrics->horiAdvance,
glyph->x_scale );
}
else if ( (load_flags & FT_LOAD_NO_SCALE) == 0 )
{
/* scale the outline and the metrics */
T1_Int n;
FT_Outline* cur = &decoder.builder.base;
T1_Vector* vec = cur->points;
T1_Fixed x_scale = glyph->x_scale;
T1_Fixed y_scale = glyph->y_scale;
/* First of all, scale the points */
for ( n = cur->n_points; n > 0; n--, vec++ )
{
vec->x = FT_MulFix( vec->x, x_scale );
vec->y = FT_MulFix( vec->y, y_scale );
}
/* Then scale the metrics */
metrics->width = FT_MulFix( metrics->width, x_scale );
metrics->height = FT_MulFix( metrics->height, y_scale );
metrics->horiBearingX = FT_MulFix( metrics->horiBearingX, x_scale );
metrics->horiBearingY = FT_MulFix( metrics->horiBearingY, y_scale );
metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
metrics->vertBearingX = FT_MulFix( metrics->vertBearingX, x_scale );
metrics->vertBearingY = FT_MulFix( metrics->vertBearingY, y_scale );
metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, x_scale );
}
}
return error;
}