ref: e97cb9127dbc8a10d07209aee679a0717346f1f6
dir: /src/type1z/z1gload.c/
/***************************************************************************/
/* */
/* z1gload.c */
/* */
/* Experimental 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. */
/* */
/***************************************************************************/
#ifdef FT_FLAT_COMPILE
#include "z1gload.h"
#else
#include <type1z/z1gload.h>
#endif
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftstream.h>
#include <freetype/ftoutln.h>
#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_z1gload
typedef enum Z1_Operator_
{
op_none = 0,
op_endchar,
op_hsbw,
op_seac,
op_sbw,
op_closepath,
op_hlineto,
op_hmoveto,
op_hvcurveto,
op_rlineto,
op_rmoveto,
op_rrcurveto,
op_vhcurveto,
op_vlineto,
op_vmoveto,
op_dotsection,
op_hstem,
op_hstem3,
op_vstem,
op_vstem3,
op_div,
op_callothersubr,
op_callsubr,
op_pop,
op_return,
op_setcurrentpoint,
op_max /* never remove this one */
} Z1_Operator;
static
const FT_Int t1_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 */
};
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/********** *********/
/********** *********/
/********** GENERIC CHARSTRING PARSING *********/
/********** *********/
/********** *********/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Function> */
/* Z1_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. */
/* */
LOCAL_FUNC
void Z1_Init_Builder( Z1_Builder* builder,
T1_Face face,
Z1_Size size,
Z1_GlyphSlot glyph )
{
builder->path_begun = 0;
builder->load_points = 1;
builder->face = face;
builder->glyph = glyph;
builder->memory = face->root.memory;
if ( glyph )
{
FT_GlyphLoader* loader = glyph->root.loader;
builder->loader = loader;
builder->current = &loader->current.outline;
builder->base = &loader->base.outline;
FT_GlyphLoader_Rewind( loader );
}
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;
}
/*************************************************************************/
/* */
/* <Function> */
/* Z1_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 Z1_Done_Builder( Z1_Builder* builder )
{
Z1_GlyphSlot glyph = builder->glyph;
if ( glyph )
glyph->root.outline = *builder->base;
}
/*************************************************************************/
/* */
/* <Function> */
/* Z1_Init_Decoder */
/* */
/* <Description> */
/* Initializes a given glyph decoder. */
/* */
/* <InOut> */
/* decoder :: A pointer to the glyph builder to initialize. */
/* */
LOCAL_FUNC
void Z1_Init_Decoder( Z1_Decoder* decoder )
{
decoder->top = 0;
decoder->zone = 0;
decoder->flex_state = 0;
decoder->num_flex_vectors = 0;
decoder->blend = 0;
/* Clear loader */
MEM_Set( &decoder->builder, 0, sizeof ( decoder->builder ) );
}
/* check that there is enough space for `count' more points */
static
FT_Error check_points( Z1_Builder* builder,
FT_Int count )
{
return FT_GlyphLoader_Check_Points( builder->loader, count, 0 );
}
/* add a new point; do not check space */
static
void add_point( Z1_Builder* builder,
FT_Pos x,
FT_Pos y,
FT_Byte flag )
{
FT_Outline* outline = builder->current;
if ( builder->load_points )
{
FT_Vector* point = outline->points + outline->n_points;
FT_Byte* control = (FT_Byte*)outline->tags + outline->n_points;
point->x = x;
point->y = y;
*control = flag ? FT_Curve_Tag_On : FT_Curve_Tag_Cubic;
builder->last = *point;
}
outline->n_points++;
}
/* check space for a new on-curve point, then add it */
static
FT_Error add_point1( Z1_Builder* builder,
FT_Pos x,
FT_Pos y )
{
FT_Error error;
error = check_points( builder, 1 );
if ( !error )
add_point( builder, x, y, 1 );
return error;
}
/* check space for a new contour, then add it */
static
FT_Error add_contour( Z1_Builder* builder )
{
FT_Outline* outline = builder->current;
FT_Error error;
if ( !builder->load_points )
{
outline->n_contours++;
return FT_Err_Ok;
}
/* reallocate contours array if necessary */
error = FT_GlyphLoader_Check_Points( builder->loader, 0, 1 );
if ( !error )
{
if ( outline->n_contours > 0 )
outline->contours[outline->n_contours - 1] = outline->n_points - 1;
outline->n_contours++;
}
return error;
}
/* if a path was begun, add its first on-curve point */
static
FT_Error start_point( Z1_Builder* builder,
FT_Pos x,
FT_Pos y )
{
/* test whether we are building a new contour */
if ( !builder->path_begun )
{
FT_Error error;
builder->path_begun = 1;
error = add_contour( builder );
if ( error )
return error;
}
return add_point1( builder, x, y );
}
/* close the current contour */
static
void close_contour( Z1_Builder* builder )
{
FT_Outline* outline = builder->current;
/* XXX: we must not include the last point in the path if it */
/* is located on the first point */
if ( outline->n_points > 1 )
{
FT_Int first = 0;
FT_Vector* p1 = outline->points + first;
FT_Vector* p2 = outline->points + outline->n_points-1;
if ( outline->n_contours > 1 )
{
first = outline->contours[outline->n_contours - 2] + 1;
p1 = outline->points + first;
}
if ( p1->x == p2->x && p1->y == p2->y )
outline->n_points--;
}
if ( outline->n_contours > 0 )
outline->contours[outline->n_contours - 1] = outline->n_points - 1;
}
/*************************************************************************/
/* */
/* <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( Z1_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* 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:" ));
FT_ERROR(( " 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->subglyphs = loader->base.subglyphs;
glyph->format = ft_glyph_format_composite;
loader->current.num_subglyphs = 2;
}
/* First load `bchar' in builder */
/* now load the unscaled outline */
FT_GlyphLoader_Prepare( decoder->builder.loader ); /* prepare loader */
error = Z1_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 = base->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 = Z1_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;
}
#define USE_ARGS( n ) do \
{ \
top -= n; \
if ( top < decoder->stack ) \
goto Stack_Underflow; \
} while ( 0 )
/*************************************************************************/
/* */
/* <Function> */
/* Z1_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 Z1_Parse_CharStrings( Z1_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;
Z1_Decoder_Zone* zone;
FT_Byte* ip;
FT_Byte* limit;
Z1_Builder* builder = &decoder->builder;
FT_Outline* outline;
FT_Pos x, y;
/* 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;
outline = builder->current;
x = builder->pos_x;
y = builder->pos_y;
/* now, execute loop */
while ( ip < limit )
{
FT_Int* top = decoder->top;
Z1_Operator op = op_none;
FT_Long value = 0;
/*********************************************************************/
/* */
/* Decode operator or operand */
/* */
/* */
/* 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(( "Z1_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(( "Z1_Parse_CharStrings: invalid escape (12+%d)\n",
ip[-1] ));
goto Syntax_Error;
}
break;
case 255: /* four bytes integer */
if ( ip + 4 > limit )
{
FT_ERROR(( "Z1_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(( "Z1_Parse_CharStrings:" ));
FT_ERROR(( " 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(( "Z1_Parse_CharStrings: invalid byte (%d)\n",
ip[-1] ));
goto Syntax_Error;
}
}
/*********************************************************************/
/* */
/* Push value on stack, or process operator */
/* */
/* */
if ( op == op_none )
{
if ( top - decoder->stack >= T1_MAX_CHARSTRINGS_OPERANDS )
{
FT_ERROR(( "Z1_Parse_CharStrings: stack overflow!\n" ));
goto Syntax_Error;
}
FT_TRACE4(( " %ld", value ));
*top++ = value;
decoder->top = top;
}
else if ( op == op_callothersubr ) /* callothersubr */
{
FT_TRACE4(( " callothersubr" ));
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;
if ( start_point( builder, x, y ) ||
check_points( builder, 6 ) )
goto Memory_Error;
break;
case 2: /* add flex vectors */
{
FT_Int index;
if ( top[0] != 0 )
goto Unexpected_OtherSubr;
/* note that we should not add a point for index 0; */
/* this will move our current position to the flex */
/* point without adding any point to the outline */
index = decoder->num_flex_vectors++;
if ( index > 0 && index < 7 )
add_point( builder,
x,
y,
(FT_Byte)( index == 3 || index == 6 ) );
}
break;
case 0: /* end flex feature */
if ( top[0] != 3 )
goto Unexpected_OtherSubr;
if ( decoder->flex_state == 0 ||
decoder->num_flex_vectors != 7 )
{
FT_ERROR(( "Z1_Parse_CharStrings: unexpected flex end\n" ));
goto Syntax_Error;
}
/* now consume the remaining `pop pop setcurpoint' */
if ( ip + 6 > limit ||
ip[0] != 12 || ip[1] != 17 || /* pop */
ip[2] != 12 || ip[3] != 17 || /* pop */
ip[4] != 12 || ip[5] != 33 ) /* setcurpoint */
{
FT_ERROR(( "Z1_Parse_CharStrings: invalid flex charstring\n" ));
goto Syntax_Error;
}
ip += 6;
decoder->flex_state = 0;
break;
case 3: /* change hints */
if ( top[0] != 1 )
goto Unexpected_OtherSubr;
/* eat the following `pop' */
if ( ip + 2 > limit )
{
FT_ERROR(( "Z1_Parse_CharStrings: invalid escape (12+%d)\n",
ip[-1] ));
goto Syntax_Error;
}
if ( ip[0] != 12 || ip[1] != 17 )
{
FT_ERROR(( "Z1_Parse_CharStrings:" ));
FT_ERROR(( " `pop' expected, found (%d %d)\n",
ip[0], ip[1] ));
goto Syntax_Error;
}
ip += 2;
break;
case 12:
case 13:
/* counter control hints, clear stack */
top = decoder->stack;
break;
case 14:
case 15:
case 16:
case 17:
case 18: /* multiple masters */
{
T1_Blend* blend = decoder->blend;
FT_UInt num_points, nn, mm;
FT_Int* delta;
FT_Int* values;
if ( !blend )
{
FT_ERROR(( "Z1_Parse_CharStrings:" ));
FT_ERROR(( " unexpected multiple masters operator!\n" ));
goto Syntax_Error;
}
num_points = top[1] - 13 + ( top[1] == 18 );
if ( top[0] != (FT_Int)( num_points * blend->num_designs ) )
{
FT_ERROR(( "Z1_Parse_CharStrings:" ));
FT_ERROR(( " incorrect number of mm arguments\n" ));
goto Syntax_Error;
}
top -= blend->num_designs*num_points;
if ( top < decoder->stack )
goto Stack_Underflow;
/* we want to compute: */
/* */
/* a0*w0 + a1*w1 + ... + ak*wk */
/* */
/* but we only have the a0, a1-a0, a2-a0, .. ak-a0 */
/* however, given that w0 + w1 + ... + wk == 1, we can */
/* rewrite it easily as: */
/* */
/* a0 + (a1-a0)*w1 + (a2-a0)*w2 + .. + (ak-a0)*wk */
/* */
/* where k == num_designs-1 */
/* */
/* I guess that's why it's written in this `compact' */
/* form. */
/* */
delta = top + num_points;
values = top;
for ( nn = 0; nn < num_points; nn++ )
{
FT_Int x = values[0];
for ( mm = 1; mm < blend->num_designs; mm++ )
x += FT_MulFix( *delta++, blend->weight_vector[mm] );
*values++ = x;
}
/* note that `top' will be incremented later by calls to `pop' */
break;
}
default:
Unexpected_OtherSubr:
FT_ERROR(( "Z1_Parse_CharStrings: invalid othersubr [%d %d]!\n",
top[0], top[1] ));
goto Syntax_Error;
}
decoder->top = top;
}
else /* general operator */
{
FT_Int num_args = t1_args_count[op];
if ( top - decoder->stack < num_args )
goto Stack_Underflow;
top -= num_args;
switch ( op )
{
case op_endchar:
FT_TRACE4(( " endchar" ));
close_contour( builder );
/* add current outline to the glyph slot */
FT_GlyphLoader_Add( builder->loader );
/* return now! */
FT_TRACE4(( "\n\n" ));
return T1_Err_Ok;
case op_hsbw:
FT_TRACE4(( " hsbw" ));
builder->left_bearing.x += top[0];
builder->advance.x = top[1];
builder->advance.y = 0;
builder->last.x = x = top[0];
builder->last.y = y = 0;
/* the `metrics_only' indicates that we only want to compute */
/* the glyph's metrics (lsb + advance width), not load the */
/* rest of it; so exit immediately */
if ( builder->metrics_only )
return T1_Err_Ok;
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:
FT_TRACE4(( " sbw" ));
builder->left_bearing.x += top[0];
builder->left_bearing.y += top[1];
builder->advance.x = top[2];
builder->advance.y = top[3];
builder->last.x = x = top[0];
builder->last.y = y = top[1];
/* the `metrics_only' indicates that we only want to compute */
/* the glyph's metrics (lsb + advance width), not load the */
/* rest of it; so exit immediately */
if ( builder->metrics_only )
return T1_Err_Ok;
break;
case op_closepath:
FT_TRACE4(( " closepath" ));
close_contour( builder );
builder->path_begun = 0;
break;
case op_hlineto:
FT_TRACE4(( " hlineto" ));
if ( start_point( builder, x, y ) )
goto Memory_Error;
x += top[0];
goto Add_Line;
case op_hmoveto:
FT_TRACE4(( " hmoveto" ));
x += top[0];
break;
case op_hvcurveto:
FT_TRACE4(( " hvcurveto" ));
if ( start_point( builder, x, y ) ||
check_points( builder, 3 ) )
goto Memory_Error;
x += top[0];
add_point( builder, x, y, 0 );
x += top[1];
y += top[2];
add_point( builder, x, y, 0 );
y += top[3];
add_point( builder, x, y, 1 );
break;
case op_rlineto:
FT_TRACE4(( " rlineto" ));
if ( start_point( builder, x, y ) )
goto Memory_Error;
x += top[0];
y += top[1];
Add_Line:
if ( add_point1( builder, x, y ) )
goto Memory_Error;
break;
case op_rmoveto:
FT_TRACE4(( " rmoveto" ));
x += top[0];
y += top[1];
break;
case op_rrcurveto:
FT_TRACE4(( " rcurveto" ));
if ( start_point( builder, x, y ) ||
check_points( builder, 3 ) )
goto Memory_Error;
x += top[0];
y += top[1];
add_point( builder, x, y, 0 );
x += top[2];
y += top[3];
add_point( builder, x, y, 0 );
x += top[4];
y += top[5];
add_point( builder, x, y, 1 );
break;
case op_vhcurveto:
FT_TRACE4(( " vhcurveto" ));
if ( start_point( builder, x, y ) ||
check_points( builder, 3 ) )
goto Memory_Error;
y += top[0];
add_point( builder, x, y, 0 );
x += top[1];
y += top[2];
add_point( builder, x, y, 0 );
x += top[3];
add_point( builder, x, y, 1 );
break;
case op_vlineto:
FT_TRACE4(( " vlineto" ));
if ( start_point( builder, x, y ) )
goto Memory_Error;
y += top[0];
goto Add_Line;
case op_vmoveto:
FT_TRACE4(( " vmoveto" ));
y += top[0];
break;
case op_div:
FT_TRACE4(( " div" ));
if ( top[1] )
{
*top = top[0] / top[1];
++top;
}
else
{
FT_ERROR(( "Z1_Parse_CharStrings: division by 0\n" ));
goto Syntax_Error;
}
break;
case op_callsubr:
{
FT_Int index;
FT_TRACE4(( " callsubr" ));
index = top[0];
if ( index < 0 || index >= num_subrs )
{
FT_ERROR(( "Z1_Parse_CharStrings: invalid subrs index\n" ));
goto Syntax_Error;
}
if ( zone - decoder->zones >= T1_MAX_SUBRS_CALLS )
{
FT_ERROR(( "Z1_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(( "Z1_Parse_CharStrings: invoking empty subrs!\n" ));
goto Syntax_Error;
}
decoder->zone = zone;
ip = zone->base;
limit = zone->limit;
break;
}
case op_pop:
FT_TRACE4(( " pop" ));
/* theorically, the arguments are already on the stack */
top++;
break;
case op_return:
FT_TRACE4(( " return" ));
if ( zone <= decoder->zones )
{
FT_ERROR(( "Z1_Parse_CharStrings: unexpected return\n" ));
goto Syntax_Error;
}
zone--;
ip = zone->cursor;
limit = zone->limit;
decoder->zone = zone;
break;
case op_dotsection:
FT_TRACE4(( " dotsection" ));
break;
case op_hstem:
FT_TRACE4(( " hstem" ));
break;
case op_hstem3:
FT_TRACE4(( " hstem3" ));
break;
case op_vstem:
FT_TRACE4(( " vstem" ));
break;
case op_vstem3:
FT_TRACE4(( " vstem3" ));
break;
case op_setcurrentpoint:
FT_TRACE4(( " setcurrentpoint" ));
FT_ERROR(( "Z1_Parse_CharStrings:" ));
FT_ERROR(( " unexpected `setcurrentpoint'\n" ));
goto Syntax_Error;
default:
FT_ERROR(( "Z1_Parse_CharStrings: unhandled opcode %d\n", op ));
goto Syntax_Error;
}
decoder->top = top;
} /* general operator processing */
} /* while ip < limit */
FT_TRACE4(( "..end..\n\n" ));
return error;
Syntax_Error:
return T1_Err_Syntax_Error;
Stack_Underflow:
return T1_Err_Stack_Underflow;
Memory_Error:
return builder->error;
}
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/********** *********/
/********** 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. *********/
/********** *********/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
LOCAL_FUNC
FT_Error Z1_Compute_Max_Advance( T1_Face face,
FT_Int* max_advance )
{
FT_Error error;
Z1_Decoder decoder;
FT_Int glyph_index;
T1_Font* type1 = &face->type1;
*max_advance = 0;
/* Initialize load decoder */
Z1_Init_Decoder( &decoder );
Z1_Init_Builder( &decoder.builder, face, 0, 0 );
decoder.blend = face->blend;
decoder.builder.metrics_only = 1;
decoder.builder.load_points = 0;
/* 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 = Z1_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' *********/
/********** *********/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
LOCAL_FUNC
FT_Error Z1_Load_Glyph( Z1_GlyphSlot glyph,
Z1_Size size,
FT_Int glyph_index,
FT_Int load_flags )
{
FT_Error error;
Z1_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;
hinting = ( load_flags & FT_LOAD_NO_SCALE ) == 0 &&
( load_flags & FT_LOAD_NO_HINTING ) == 0;
glyph->root.format = ft_glyph_format_outline;
Z1_Init_Decoder( &decoder );
Z1_Init_Builder( &decoder.builder, face, size, glyph );
decoder.blend = ((T1_Face)glyph->root.face)->blend;
decoder.builder.no_recurse = ( load_flags & FT_LOAD_NO_RECURSE ) != 0;
/* now load the unscaled outline */
error = Z1_Parse_CharStrings( &decoder,
type1->charstrings [glyph_index],
type1->charstrings_len[glyph_index],
type1->num_subrs,
type1->subrs,
type1->subrs_len );
/* save new glyph tables */
Z1_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 )
{
glyph->root.outline.flags &= ft_outline_owner;
glyph->root.outline.flags |= ft_outline_reverse_fill;
/* for composite glyphs, return only left side bearing and */
/* 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;
/* 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;
if ( size && size->root.metrics.y_ppem < 24 )
glyph->root.outline.flags |= ft_outline_high_precision;
#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 /* 0 */
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 );
}
FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
/* Then scale the metrics */
metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
metrics->vertBearingX = FT_MulFix( metrics->vertBearingX, x_scale );
metrics->vertBearingY = FT_MulFix( metrics->vertBearingY, y_scale );
}
/* apply the font matrix */
FT_Outline_Transform( &glyph->root.outline,
&face->type1.font_matrix );
/* compute the other metrics */
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;
}
}
return error;
}
/* END */