ref: 728da1c863acace7dc9dcd0d732ccdb30c6f210d
dir: /src/type1/t1gload.c/
/***************************************************************************/
/* */
/* t1gload.c */
/* */
/* Type 1 Glyph Loader (body). */
/* */
/* Copyright 1996-2000 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 <freetype/internal/ftdebug.h>
#include <freetype/internal/ftstream.h>
#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
#include <t1hinter.h>
#endif
#include <string.h> /* for strcmp() */
/*************************************************************************/
/* */
/* 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_t1gload
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/********** *********/
/********** *********/
/********** GENERIC CHARSTRING PARSING *********/
/********** *********/
/********** *********/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
static
void T1_Reset_Builder( T1_Builder* builder,
FT_Bool reset_base )
{
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->pass = 0;
builder->hint_point = 0;
if ( builder->loader )
{
if ( reset_base )
FT_GlyphLoader_Rewind( builder->loader );
FT_GlyphLoader_Prepare( builder->loader );
}
}
/*************************************************************************/
/* */
/* <Function> */
/* T1_Init_Builder */
/* */
/* <Description> */
/* Initializes a given glyph builder. */
/* */
/* <InOut> */
/* builder :: A pointer to the glyph builder to initialize. */
/* */
/* <Input> */
/* face :: The current face object. */
/* */
/* size :: The current size object. */
/* */
/* glyph :: The current glyph object. */
/* */
/* funcs :: Glyph builder functions (or `methods'). */
/* */
LOCAL_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 )
{
FT_GlyphLoader* loader = FT_SLOT( glyph )->loader;
builder->loader = loader;
builder->base = &loader->base.outline;
builder->current = &loader->current.outline;
}
if ( size )
{
builder->scale_x = size->root.metrics.x_scale;
builder->scale_y = size->root.metrics.y_scale;
}
T1_Reset_Builder( builder, 1 );
}
/*************************************************************************/
/* */
/* <Function> */
/* T1_Done_Builder */
/* */
/* <Description> */
/* Finalizes a given glyph builder. Its contents can still be used */
/* after the call, but the function saves important information */
/* within the corresponding glyph slot. */
/* */
/* <Input> */
/* builder :: A pointer to the glyph builder to finalize. */
/* */
LOCAL_FUNC
void T1_Done_Builder( T1_Builder* builder )
{
T1_GlyphSlot glyph = builder->glyph;
if ( glyph )
glyph->root.outline = *builder->base;
}
/*************************************************************************/
/* */
/* <Function> */
/* T1_Init_Decoder */
/* */
/* <Description> */
/* Initializes a given glyph decoder. */
/* */
/* <InOut> */
/* decoder :: A pointer to the glyph builder to initialize. */
/* */
/* <Input> */
/* funcs :: The hinting functions interface. */
LOCAL_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> */
/* Looks up a given glyph by its StandardEncoding charcode. Used */
/* to implement the SEAC Type 1 operator. */
/* */
/* <Input> */
/* face :: The current face object. */
/* */
/* charcode :: The character code to look for. */
/* */
/* <Return> */
/* A glyph index in the font face. Returns -1 if the corresponding */
/* glyph wasn't found. */
/* */
static
FT_Int lookup_glyph_by_stdcharcode( T1_Face face,
FT_Int charcode )
{
FT_Int n;
const FT_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++ )
{
FT_String* name = (FT_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 :: The current CID decoder. */
/* */
/* asb :: The accent's side bearing. */
/* */
/* adx :: The horizontal offset of the accent. */
/* */
/* ady :: The vertical offset of the accent. */
/* */
/* bchar :: The base character's StandardEncoding charcode. */
/* */
/* achar :: The accent character's StandardEncoding charcode. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
static
FT_Error t1operator_seac( T1_Decoder* decoder,
FT_Pos asb,
FT_Pos adx,
FT_Pos ady,
FT_Int bchar,
FT_Int achar )
{
FT_Error error;
FT_Int bchar_index, achar_index, n_base_points;
FT_Outline* cur = decoder->builder.current;
FT_Outline* base = decoder->builder.base;
FT_Vector left_bearing, advance;
T1_Face face = decoder->builder.face;
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(( "t1operator_seac: invalid seac character code arguments\n" ));
return T1_Err_Syntax_Error;
}
/* if we are trying to load a composite glyph, do not load the */
/* accent character and return the array of subglyphs. */
if ( decoder->builder.no_recurse )
{
FT_GlyphSlot glyph = (FT_GlyphSlot)decoder->builder.glyph;
FT_GlyphLoader* loader = glyph->loader;
FT_SubGlyph* subg;
/* reallocate subglyph array if necessary */
error = FT_GlyphLoader_Check_Subglyphs( loader, 2 );
if ( error )
goto Exit;
subg = loader->current.subglyphs;
/* subglyph 0 = base character */
subg->index = bchar_index;
subg->flags = FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES |
FT_SUBGLYPH_FLAG_USE_MY_METRICS;
subg->arg1 = 0;
subg->arg2 = 0;
subg++;
/* subglyph 1 = accent character */
subg->index = achar_index;
subg->flags = FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES;
subg->arg1 = adx - asb;
subg->arg2 = ady;
/* set up remaining glyph fields */
glyph->num_subglyphs = 2;
glyph->format = ft_glyph_format_composite;
loader->current.num_subglyphs = 2;
goto Exit;
}
/* First load `bchar' in builder */
/* now load the unscaled outline */
if ( decoder->builder.loader )
FT_GlyphLoader_Prepare( decoder->builder.loader ); /* prepare loader */
error = T1_Parse_CharStrings( decoder,
type1->charstrings [bchar_index],
type1->charstrings_len[bchar_index],
type1->num_subrs,
type1->subrs,
type1->subrs_len );
if ( error )
goto Exit;
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 */
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;
/* 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 */
if ( decoder->builder.load_points )
{
FT_Outline dummy;
dummy.n_points = base->n_points - n_base_points;
dummy.points = base->points + n_base_points;
FT_Outline_Translate( &dummy, adx - asb, ady );
}
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* t1operator_flex */
/* */
/* <Description> */
/* Implements the `flex' Type 1 operator for a Type 1 decoder. */
/* */
/* <Input> */
/* decoder :: The current Type 1 decoder. */
/* threshold :: The threshold. */
/* end_x :: The horizontal position of the final flex point. */
/* end_y :: The vertical position of the final flex point. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
static
FT_Error t1operator_flex( T1_Decoder* decoder,
FT_Pos threshold,
FT_Pos end_x,
FT_Pos end_y )
{
FT_Vector vec;
FT_Vector* flex = decoder->flex_vectors;
FT_Int n;
UNUSED( threshold );
UNUSED( end_x );
UNUSED( end_y );
/* 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++;
}
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 :: The current Type 1 decoder. */
/* */
/* charstring_base :: The base address of the charstring stream. */
/* */
/* charstring_len :: The length in bytes of the charstring stream. */
/* */
/* num_subrs :: The number of sub-routines. */
/* */
/* subrs_base :: An array of sub-routines addresses. */
/* */
/* subrs_len :: An array of sub-routines lengths. */
/* */
/* <Return> */
/* Free error code. 0 means success. */
/* */
LOCAL_FUNC
FT_Error T1_Parse_CharStrings( T1_Decoder* decoder,
FT_Byte* charstring_base,
FT_Int charstring_len,
FT_Int num_subrs,
FT_Byte** subrs_base,
FT_Int* subrs_len )
{
FT_Error error;
T1_Decoder_Zone* zone;
FT_Byte* ip;
FT_Byte* limit;
T1_Builder* builder = &decoder->builder;
T1_Builder_Funcs* builds = &builder->funcs;
T1_Hinter_Funcs* hints = &decoder->hinter;
static const FT_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, initialize 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 )
{
FT_Int* top = decoder->top;
T1_Operator op = op_none;
FT_Long value = 0;
/* Start with the decompression of 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 = ( (FT_Long)ip[0] << 24 ) |
( (FT_Long)ip[1] << 16 ) |
( (FT_Long)ip[2] << 8 ) |
ip[3];
ip += 4;
break;
default:
if ( ip[-1] >= 32 )
{
if ( ip[-1] < 247 )
value = (FT_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 = ((FT_Long)( ip[-2] - 247 ) << 8 ) + ip[-1] + 108;
else
value = -( ( ( (FT_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 */
{
FT_Int index;
FT_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
{
FT_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];
++top;
}
else
{
FT_ERROR(( "T1_Parse_CHarStrings: division by 0\n" ));
goto Syntax_Error;
}
break;
case op_callsubr:
{
FT_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 :: A pointer to the glyph builder object. */
/* */
/* num_points :: The number of points that will be added later. */
/* */
/* <Return> */
/* FreeType 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 has been invoked. */
/* */
LOCAL_FUNC
FT_Error T1_Add_Points( T1_Builder* builder,
FT_Int num_points )
{
return FT_GlyphLoader_Check_Points( builder->loader, num_points, 0 );
}
/*************************************************************************/
/* */
/* <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 */
/* function grows the load outline's arrays accordingly. */
/* */
/* <Input> */
/* builder :: A pointer to the glyph builder object. */
/* */
/* num_contours :: The number of contours that will be added later. */
/* */
/* <Return> */
/* FreeType 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
FT_Error T1_Add_Contours( T1_Builder* builder,
FT_Int num_contours )
{
return FT_GlyphLoader_Check_Points( builder->loader, 0, num_contours );
}
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/********** *********/
/********** COMPUTE THE MAXIMUM ADVANCE WIDTH *********/
/********** *********/
/********** The following code is in charge of computing *********/
/********** the maximum advance width of the font. It *********/
/********** quickly processes each glyph charstring to *********/
/********** extract the value from either a `sbw' or `seac' *********/
/********** operator. *********/
/********** *********/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
static
FT_Error maxadv_sbw( T1_Decoder* decoder,
FT_Pos sbx,
FT_Pos sby,
FT_Pos wx,
FT_Pos wy )
{
UNUSED( sbx );
UNUSED( sby );
UNUSED( wy );
if ( wx > decoder->builder.advance.x )
decoder->builder.advance.x = wx;
return -1; /* return an error code to exit the Type 1 parser */
/* immediately. */
}
static
FT_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_hinter_interface always return an error. */
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
FT_Error T1_Compute_Max_Advance( T1_Face face,
FT_Int* max_advance )
{
FT_Error error;
T1_Decoder decoder;
FT_Int glyph_index;
T1_Font* type1 = &face->type1;
*max_advance = 0;
/* Initialize 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 */
}
*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
FT_Error close_open_path( T1_Builder* builder )
{
FT_Error error;
FT_Outline* cur = builder->current;
FT_Int num_points;
FT_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 )
{
FT_Vector* source_point;
char* source_tags;
FT_Vector* point;
char* tags;
error = T1_Add_Points( builder, num_points );
if ( error )
return error;
point = cur->points + cur->n_points;
tags = cur->tags + cur->n_points;
source_point = point - 2;
source_tags = tags - 2;
cur->n_points += num_points;
if ( builder->load_points )
do
{
*point++ = *source_point--;
*tags++ = *source_tags--;
num_points--;
} while ( num_points > 0 );
}
builder->path_begun = 0;
return T1_Err_Ok;
}
static
FT_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
FT_Error gload_endchar( T1_Builder* builder )
{
FT_Error error;
/* close path if needed */
if ( builder->path_begun )
{
error = close_open_path( builder );
if ( error )
return error;
}
error = gload_closepath( builder );
FT_GlyphLoader_Add( builder->loader );
return error;
}
static
FT_Error gload_sbw( T1_Builder* builder,
FT_Pos sbx,
FT_Pos sby,
FT_Pos wx,
FT_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
FT_Error gload_rlineto( T1_Builder* builder,
FT_Pos dx,
FT_Pos dy )
{
FT_Error error;
FT_Outline* cur = builder->current;
FT_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->tags [cur->n_points] = FT_Curve_Tag_On;
builder->last = vec;
}
cur->n_points++;
builder->path_begun = 1;
return T1_Err_Ok;
}
static
FT_Error gload_rmoveto( T1_Builder* builder,
FT_Pos dx,
FT_Pos dy )
{
FT_Error error;
FT_Outline* cur = builder->current;
FT_Vector vec;
/* in the case where `path_begun' is set, we have an `rmoveto' */
/* after some normal path definition. If 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 paths, 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->tags [cur->n_points] = FT_Curve_Tag_On;
builder->last = vec;
}
cur->n_contours++;
cur->n_points++;
return T1_Err_Ok;
}
static
FT_Error gload_rrcurveto( T1_Builder* builder,
FT_Pos dx1,
FT_Pos dy1,
FT_Pos dx2,
FT_Pos dy2,
FT_Pos dx3,
FT_Pos dy3 )
{
FT_Error error;
FT_Outline* cur = builder->current;
FT_Vector vec;
FT_Vector* points;
char* tags;
/* 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;
tags = cur->tags + cur->n_points;
vec.x = builder->last.x + dx1;
vec.y = builder->last.y + dy1;
points[0] = vec;
tags[0] = FT_Curve_Tag_Cubic;
vec.x += dx2;
vec.y += dy2;
points[1] = vec;
tags[1] = FT_Curve_Tag_Cubic;
vec.x += dx3;
vec.y += dy3;
points[2] = vec;
tags[2] = FT_Curve_Tag_On;
builder->last = vec;
}
cur->n_points += 3;
builder->path_begun = 1;
return T1_Err_Ok;
}
static
FT_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 */
};
#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. */
/* */
/*************************************************************************/
static
FT_Error t1_load_hinted_glyph( T1_Decoder* decoder,
FT_UInt glyph_index,
FT_Bool recurse )
{
T1_Builder* builder = &decoder->builder;
T1_GlyphSlot glyph = builder->glyph;
T1_Font* type1 = &builder->face->type1;
FT_UInt old_points, old_contours;
FT_GlyphLoader* loader = decoder->builder.loader;
FT_Error error;
/* Pass 1 - try to load first glyph, simply recording points */
old_points = loader->base.outline.n_points;
old_contours = loader->base.outline.n_contours;
FT_GlyphLoader_Prepare( decoder->builder.loader );
T1_Reset_Builder( builder, 0 );
builder->no_recurse = recurse;
builder->pass = 0;
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 );
if ( error )
goto Exit;
/* check for composite (i.e. `seac' operator) */
if ( glyph->root.format == ft_glyph_format_composite )
{
/* this is a composite glyph, we must then load the first one, */
/* then load the second one on top of it and translate it by a */
/* fixed amount. */
FT_UInt n_base_points;
FT_SubGlyph* subglyph = loader->base.subglyphs;
T1_Size size = builder->size;
FT_Pos dx, dy;
FT_Vector left_bearing, advance;
/* clean glyph format */
glyph->root.format = ft_glyph_format_none;
/* First load `bchar' in builder */
builder->no_recurse = 0;
error = t1_load_hinted_glyph( decoder, subglyph->index, 0 );
if ( error )
goto Exit;
/* save the left bearing and width of the base character */
/* as they will be erased by the next load */
left_bearing = builder->left_bearing;
advance = builder->advance;
/* Then load `achar' in builder */
n_base_points = builder->base->n_points;
subglyph++;
error = t1_load_hinted_glyph( decoder, subglyph->index, 0 );
if ( error )
goto Exit;
/* Finally, move the accent */
dx = FT_MulFix( subglyph->arg1, size->root.metrics.x_scale );
dy = FT_MulFix( subglyph->arg2, size->root.metrics.y_scale );
dx = ( dx + 32 ) & -64;
dy = ( dy + 32 ) & -64;
{
FT_Outline dummy;
dummy.n_points = loader->base.outline.n_points - n_base_points;
dummy.points = loader->base.outline.points + n_base_points;
FT_Outline_Translate( &dummy, dx, dy );
}
/* restore the left side bearing and */
/* advance width of the base character */
builder->left_bearing = left_bearing;
builder->advance = advance;
}
else
{
/* All right, pass 1 is finished, now grid-fit all stem hints */
T1_Hint_Stems( &decoder->builder );
/* undo the end-char */
builder->base->n_points = old_points;
builder->base->n_contours = old_contours;
/* Pass 2 - record and scale/hint the points */
T1_Reset_Builder( builder, 0 );
builder->pass = 1;
builder->no_recurse = 0;
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 */
if ( recurse )
T1_Done_Builder( builder );
Exit:
return error;
}
#endif /* T1_CONFIG_OPTION_DISABLE_HINTER */
LOCAL_FUNC
FT_Error T1_Load_Glyph( T1_GlyphSlot glyph,
T1_Size size,
FT_Int glyph_index,
FT_Int load_flags )
{
FT_Error error;
T1_Decoder decoder;
T1_Face face = (T1_Face)glyph->root.face;
FT_Bool hinting;
T1_Font* type1 = &face->type1;
if ( load_flags & FT_LOAD_NO_RECURSE )
load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
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
hinting = ( load_flags & ( FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING ) ) == 0;
if ( hinting )
{
T1_Init_Decoder( &decoder, &t1_hinter_funcs );
T1_Init_Builder( &decoder.builder, face, size, glyph,
&gload_builder_interface );
error = t1_load_hinted_glyph( &decoder, glyph_index, 1 );
}
else
#endif /* T1_CONFIG_OPTION_DISABLE_HINTER */
{
T1_Init_Decoder( &decoder, &gload_hinter_interface );
T1_Init_Builder( &decoder.builder, face, size, glyph,
&gload_builder_interface );
decoder.builder.no_recurse = ( load_flags & FT_LOAD_NO_RECURSE ) != 0;
/* 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 )
{
/* for composite glyphs, return only the left side bearing and the */
/* advance width */
if ( load_flags & FT_LOAD_NO_RECURSE )
{
glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x;
glyph->root.metrics.horiAdvance = decoder.builder.advance.x;
}
else
{
FT_BBox cbox;
FT_Glyph_Metrics* metrics = &glyph->root.metrics;
/* apply the font matrix */
FT_Outline_Transform( &glyph->root.outline,
&face->type1.font_matrix );
FT_Outline_Get_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.flags &= ft_outline_owner;
if ( size->root.metrics.y_ppem < 24 )
glyph->root.outline.flags |= ft_outline_high_precision;
glyph->root.outline.flags |= ft_outline_reverse_fill;
#if 0
glyph->root.outline.second_pass = TRUE;
glyph->root.outline.high_precision = size->root.metrics.y_ppem < 24;
glyph->root.outline.dropout_mode = 2;
#endif
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 */
FT_Int n;
FT_Outline* cur = decoder.builder.base;
FT_Vector* vec = cur->points;
FT_Fixed x_scale = glyph->x_scale;
FT_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;
}
/* END */