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freetype2/src/type1z/z1gload.c

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/*******************************************************************
*
* 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 <z1gload.h>
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftstream.h>
#undef FT_COMPONENT
#define FT_COMPONENT trace_t1gload
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 CHARSTRINGS PARSING *********/
/********** *********/
/********** *********/
/**********************************************************************/
/**********************************************************************/
/**********************************************************************/
/*********************************************************************
*
* <Function>
* Z1_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
*
*********************************************************************/
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>
* 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
*
*********************************************************************/
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>
* Initialise a given Type 1 decoder for parsing
*
* <Input>
* decoder :: Type 1 decoder to initialise
* funcs :: hinter functions interface
*
*********************************************************************/
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 room 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 room */
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 room 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 room 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;
}
/* realloc 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 wether we're 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;
/* XXXX : 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>
* 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
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 :: 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
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* 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->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 = 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 = 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;
}
/*********************************************************************
*
* <Function>
* Z1_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.
*
*********************************************************************/
#define USE_ARGS(n) top -= n; if (top < decoder->stack) goto Stack_Underflow
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, 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;
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(( "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 on stack, or process operator */
/* */
/* */
if ( op == op_none )
{
if ( top - decoder->stack >= T1_MAX_CHARSTRINGS_OPERANDS )
{
FT_ERROR(( "T1.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(( "T1.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(( "T1.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(( "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;
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(( "T1.Parse_CharStrings: 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(( "T1.Parse_CharStrings: 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(( "T1.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(( "T1.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(( "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_TRACE4(( " pop" ));
/* theorically, the arguments are already on the stack */
top++;
break;
}
case op_return: /************************************************/
{
FT_TRACE4(( " 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_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(( "T1.Parse_CharStrings : unexpected SETCURRENTPOINT\n" ));
goto Syntax_Error;
}
default:
FT_ERROR(( "T1.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 process 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;
/* Initialise 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. *********/
/********** *********/
/**********************************************************************/
/**********************************************************************/
/**********************************************************************/
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 = (FT_Bool)!!(load_flags & FT_LOAD_NO_RECURSE);
/* 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)
{
/* 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;
/* 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 && size->root.metrics.y_ppem < 24 )
glyph->root.outline.flags |= ft_outline_high_precision;
glyph->root.outline.flags |= ft_outline_reverse_fill;
/*
glyph->root.outline.second_pass = TRUE;
glyph->root.outline.high_precision = ( size->root.metrics.y_ppem < 24 );
glyph->root.outline.dropout_mode = 2;
*/
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->vertBearingX = FT_MulFix( metrics->vertBearingX, x_scale );
metrics->vertBearingY = FT_MulFix( metrics->vertBearingY, y_scale );
metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, x_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;
}
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