ref: e35cac66c652480b0d682647e92c2e7ef5cf7081
dir: /src/cff/t2gload.c/
/***************************************************************************/
/* */
/* t2gload.c */
/* */
/* OpenType Glyph Loader (body). */
/* */
/* 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 <freetype/internal/ftdebug.h>
#include <freetype/internal/ftcalc.h>
#include <freetype/internal/ftstream.h>
#include <freetype/internal/sfnt.h>
#include <freetype/tttags.h>
#undef FT_COMPONENT
#define FT_COMPONENT trace_t1gload
#include <t2load.h>
#include <t2gload.h>
typedef enum T2_Operator_
{
t2_op_unknown = 0,
t2_op_rmoveto,
t2_op_hmoveto,
t2_op_vmoveto,
t2_op_rlineto,
t2_op_hlineto,
t2_op_vlineto,
t2_op_rrcurveto,
t2_op_hhcurveto,
t2_op_hvcurveto,
t2_op_rcurveline,
t2_op_rlinecurve,
t2_op_vhcurveto,
t2_op_vvcurveto,
t2_op_flex,
t2_op_hflex,
t2_op_hflex1,
t2_op_flex1,
t2_op_endchar,
t2_op_hstem,
t2_op_vstem,
t2_op_hstemhm,
t2_op_vstemhm,
t2_op_hintmask,
t2_op_cntrmask,
t2_op_abs,
t2_op_add,
t2_op_sub,
t2_op_div,
t2_op_neg,
t2_op_random,
t2_op_mul,
t2_op_sqrt,
t2_op_blend,
t2_op_drop,
t2_op_exch,
t2_op_index,
t2_op_roll,
t2_op_dup,
t2_op_put,
t2_op_get,
t2_op_store,
t2_op_load,
t2_op_and,
t2_op_or,
t2_op_not,
t2_op_eq,
t2_op_ifelse,
t2_op_callsubr,
t2_op_callgsubr,
t2_op_return,
/* do not remove */
t2_op_max
} T2_Operator;
#define T2_COUNT_CHECK_WIDTH 0x80
#define T2_COUNT_EXACT 0x40
#define T2_COUNT_CLEAR_STACK 0x20
static const FT_Byte t2_argument_counts[] =
{
0, /* unknown */
2 | T2_COUNT_CHECK_WIDTH | T2_COUNT_EXACT, /* rmoveto */
1 | T2_COUNT_CHECK_WIDTH | T2_COUNT_EXACT,
1 | T2_COUNT_CHECK_WIDTH | T2_COUNT_EXACT,
0 | T2_COUNT_CLEAR_STACK, /* rlineto */
0 | T2_COUNT_CLEAR_STACK,
0 | T2_COUNT_CLEAR_STACK,
0 | T2_COUNT_CLEAR_STACK, /* rrcurveto */
0 | T2_COUNT_CLEAR_STACK,
0 | T2_COUNT_CLEAR_STACK,
0 | T2_COUNT_CLEAR_STACK,
0 | T2_COUNT_CLEAR_STACK,
0 | T2_COUNT_CLEAR_STACK,
0 | T2_COUNT_CLEAR_STACK,
13, /* flex */
7,
9,
11,
0, /* enchar */
2 | T2_COUNT_CHECK_WIDTH, /* hstem */
2 | T2_COUNT_CHECK_WIDTH,
2 | T2_COUNT_CHECK_WIDTH,
2 | T2_COUNT_CHECK_WIDTH,
0, /* hintmask */
0, /* cntrmask */
1, /* abs */
2,
2,
2,
1,
0,
2,
1,
1, /* blend */
1, /* drop */
2,
1,
2,
1,
2, /* put */
1,
4,
3,
2, /* and */
2,
1,
2,
4,
1, /* callsubr */
1,
0
};
/* required for the tracing mode */
#undef FT_COMPONENT
#define FT_COMPONENT trace_ttgload
/**********************************************************************/
/**********************************************************************/
/**********************************************************************/
/********** *********/
/********** *********/
/********** GENERIC CHARSTRINGS PARSING *********/
/********** *********/
/********** *********/
/**********************************************************************/
/**********************************************************************/
/**********************************************************************/
/*********************************************************************
*
* <Function>
* T2_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
*
*********************************************************************/
static
void T2_Init_Builder( T2_Builder* builder,
TT_Face face,
T2_Size size,
T2_GlyphSlot glyph )
{
builder->path_begun = 0;
builder->load_points = 1;
builder->face = face;
builder->glyph = glyph;
builder->memory = face->root.memory;
if (glyph)
{
builder->base = glyph->root.outline;
builder->max_points = glyph->max_points;
builder->max_contours = glyph->max_contours;
}
if (size)
{
builder->scale_x = size->metrics.x_scale;
builder->scale_y = size->metrics.y_scale;
}
builder->pos_x = 0;
builder->pos_y = 0;
builder->left_bearing.x = 0;
builder->left_bearing.y = 0;
builder->advance.x = 0;
builder->advance.y = 0;
builder->base.n_points = 0;
builder->base.n_contours = 0;
builder->current = builder->base;
}
/*********************************************************************
*
* <Function>
* T2_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
*
*********************************************************************/
static
void T2_Done_Builder( T2_Builder* builder )
{
T2_GlyphSlot glyph = builder->glyph;
if (glyph)
{
glyph->root.outline = builder->base;
glyph->max_points = builder->max_points;
glyph->max_contours = builder->max_contours;
}
}
/*********************************************************************
*
* <Function>
* T2_Init_Decoder
*
* <Description>
* Initialise a given Type 2 decoder for parsing
*
* <Input>
* decoder :: Type 1 decoder to initialise
* funcs :: hinter functions interface
*
*********************************************************************/
static FT_Int t2_compute_bias( FT_UInt num_subrs )
{
FT_Int result;
if (num_subrs < 1240)
result = 107;
else if (num_subrs < 33900)
result = 1131;
else
result = 32768;
return result;
}
LOCAL_FUNC
void T2_Init_Decoder( T2_Decoder* decoder,
TT_Face face,
T2_Size size,
T2_GlyphSlot slot )
{
CFF_Font* cff = (CFF_Font*)face->other;
/* clear everything */
MEM_Set( decoder, 0, sizeof(*decoder) );
/* initialise builder */
T2_Init_Builder( &decoder->builder, face, size, slot );
/* initialise Type2 decoder */
decoder->num_locals = cff->num_local_subrs;
decoder->num_globals = cff->num_global_subrs;
decoder->locals = cff->local_subrs;
decoder->globals = cff->global_subrs;
decoder->locals_bias = t2_compute_bias( decoder->num_locals );
decoder->globals_bias = t2_compute_bias( decoder->num_globals );
decoder->glyph_width = cff->private_dict.default_width;
decoder->nominal_width = cff->private_dict.nominal_width;
}
/* check that there is enough room for "count" more points */
static
FT_Error check_points( T2_Builder* builder,
FT_Int count )
{
FT_Outline* base = &builder->base;
FT_Outline* outline = &builder->current;
if (!builder->load_points)
return FT_Err_Ok;
count += base->n_points + outline->n_points;
/* realloc points table if necessary */
if ( count >= builder->max_points )
{
FT_Error error;
FT_Memory memory = builder->memory;
FT_Int increment = outline->points - base->points;
FT_Int current = builder->max_points;
while ( builder->max_points < count )
builder->max_points += 8;
if ( REALLOC_ARRAY( base->points, current,
builder->max_points, FT_Vector ) ||
REALLOC_ARRAY( base->tags, current,
builder->max_points, FT_Byte ) )
{
builder->error = error;
return error;
}
outline->points = base->points + increment;
outline->tags = base->tags + increment;
}
return FT_Err_Ok;
}
/* add a new point, do not check room */
static
void add_point( T2_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 >> 16;
point->y = y >> 16;
*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( T2_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( T2_Builder* builder )
{
FT_Outline* base = &builder->base;
FT_Outline* outline = &builder->current;
if (!builder->load_points)
{
outline->n_contours++;
return FT_Err_Ok;
}
/* realloc contours array if necessary */
if ( base->n_contours + outline->n_contours >= builder->max_contours &&
builder->load_points )
{
FT_Error error;
FT_Memory memory = builder->memory;
FT_Int increment = outline->contours - base->contours;
FT_Int current = builder->max_contours;
builder->max_contours += 4;
if ( REALLOC_ARRAY( base->contours,
current, builder->max_contours, FT_Short ) )
{
builder->error = error;
return error;
}
outline->contours = base->contours + increment;
}
if (outline->n_contours > 0)
outline->contours[ outline->n_contours-1 ] = outline->n_points-1;
outline->n_contours++;
return FT_Err_Ok;
}
/* if a path was begun, add its first on-curve point */
static
FT_Error start_point( T2_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( T2_Builder* builder )
{
FT_Outline* outline = &builder->current;
if ( outline->n_contours > 0 )
outline->contours[outline->n_contours-1] = outline->n_points-1;
}
/*********************************************************************
*
* <Function>
* T2_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 T2_Parse_CharStrings( T2_Decoder* decoder,
FT_Byte* charstring_base,
FT_Int charstring_len )
{
FT_Error error;
T2_Decoder_Zone* zone;
FT_Byte* ip;
FT_Byte* limit;
T2_Builder* builder = &decoder->builder;
FT_Outline* outline;
FT_Pos x, y;
FT_Fixed seed;
FT_Fixed* stack;
/* set default width */
decoder->num_hints = 0;
decoder->read_width = 1;
/* compute random seed from stack address of parameter */
seed = (FT_Fixed)(char*)&seed ^
(FT_Fixed)(char*)&decoder ^
(FT_Fixed)(char*)&charstring_base;
seed = (seed ^ (seed >> 10) ^ (seed >> 20)) & 0xFFFF;
if (seed == 0)
seed = 0x7384;
/* First of all, initialise the decoder */
decoder->top = decoder->stack;
decoder->zone = decoder->zones;
zone = decoder->zones;
stack = decoder->top;
builder->path_begun = 0;
zone->base = charstring_base;
limit = zone->limit = charstring_base + charstring_len;
ip = zone->cursor = zone->base;
error = FT_Err_Ok;
outline = &builder->current;
x = builder->pos_x;
y = builder->pos_y;
/* now, execute loop */
while ( ip < limit )
{
T2_Operator op;
FT_Byte v;
FT_Byte count;
/********************************************************************/
/* */
/* Decode operator or operand */
/* */
/* */
v = *ip++;
if (v >= 32 || v == 28)
{
FT_Int shift = 16;
FT_Long val;
/* this is an operand, push it on the stack */
if ( v == 28)
{
if ( ip+1 >= limit ) goto Syntax_Error;
val = (FT_Short)(((FT_Int)ip[0] << 8) + ip[1]);
ip += 2;
}
else if ( v < 247 )
val = v - 139;
else if ( v < 251 )
{
if ( ip >= limit ) goto Syntax_Error;
val = (v-247)*256 + *ip++ + 108;
}
else if ( v < 255 )
{
if ( ip >= limit ) goto Syntax_Error;
val = -((v-251)*256) - *ip++ - 108;
}
else
{
if ( ip + 3 >= limit ) goto Syntax_Error;
val = ((FT_Long)ip[0] << 24) |
((FT_Long)ip[1] << 16) |
((FT_Long)ip[2] << 8) | ip[3];
ip += 4;
shift = 0;
}
if (decoder->top - stack >= T2_MAX_OPERANDS)
goto Stack_Overflow;
val <<= shift;
*decoder->top ++ = val;
#ifdef FT_DEBUG_LEVEL_TRACE
if (!(val & 0xFFFF))
FT_TRACE4(( " %d", (FT_Int)(val >> 16) ));
else
FT_TRACE4(( " %.2f", val/65536.0 ));
#endif
}
else
{
FT_Fixed* args = decoder->top;
FT_Int num_args = args - decoder->stack;
FT_Int req_args;
/* find operator */
op = t2_op_unknown;
switch (v)
{
case 1: op = t2_op_hstem; break;
case 3: op = t2_op_vstem; break;
case 4: op = t2_op_vmoveto; break;
case 5: op = t2_op_rlineto; break;
case 6: op = t2_op_hlineto; break;
case 7: op = t2_op_vlineto; break;
case 8: op = t2_op_rrcurveto; break;
case 10: op = t2_op_callsubr; break;
case 11: op = t2_op_return; break;
case 12:
{
if (ip >= limit) goto Syntax_Error;
v = *ip++;
switch (v)
{
case 3: op = t2_op_and; break;
case 4: op = t2_op_or; break;
case 5: op = t2_op_not; break;
case 8: op = t2_op_store; break;
case 9: op = t2_op_abs; break;
case 10: op = t2_op_add; break;
case 11: op = t2_op_sub; break;
case 12: op = t2_op_div; break;
case 13: op = t2_op_load; break;
case 14: op = t2_op_neg; break;
case 15: op = t2_op_eq; break;
case 18: op = t2_op_drop; break;
case 20: op = t2_op_put; break;
case 21: op = t2_op_get; break;
case 22: op = t2_op_ifelse; break;
case 23: op = t2_op_random; break;
case 24: op = t2_op_mul; break;
case 26: op = t2_op_sqrt; break;
case 27: op = t2_op_dup; break;
case 28: op = t2_op_exch; break;
case 29: op = t2_op_index; break;
case 30: op = t2_op_roll; break;
case 34: op = t2_op_hflex; break;
case 35: op = t2_op_flex; break;
case 36: op = t2_op_hflex1; break;
case 37: op = t2_op_flex1; break;
default:
/* decrement ip for syntax error message */
ip--;
}
}
break;
case 14: op = t2_op_endchar; break;
case 16: op = t2_op_blend; break;
case 18: op = t2_op_hstemhm; break;
case 19: op = t2_op_hintmask; break;
case 20: op = t2_op_cntrmask; break;
case 21: op = t2_op_rmoveto; break;
case 22: op = t2_op_hmoveto; break;
case 23: op = t2_op_vstemhm; break;
case 24: op = t2_op_rcurveline; break;
case 25: op = t2_op_rlinecurve; break;
case 26: op = t2_op_vvcurveto; break;
case 27: op = t2_op_hhcurveto; break;
case 29: op = t2_op_callgsubr; break;
case 30: op = t2_op_vhcurveto; break;
case 31: op = t2_op_hvcurveto; break;
default:
;
}
if ( op == t2_op_unknown )
goto Syntax_Error;
/* check arguments */
req_args = count = t2_argument_counts[op];
if (req_args & T2_COUNT_CHECK_WIDTH)
{
args = stack;
if ( decoder->read_width )
{
decoder->glyph_width = decoder->nominal_width + (stack[0] >> 16);
decoder->read_width = 0;
num_args--;
args++;
}
req_args = 0;
}
req_args &= 15;
if (num_args < req_args) goto Stack_Underflow;
args -= req_args;
num_args -= req_args;
switch (op)
{
case t2_op_hstem:
case t2_op_vstem:
case t2_op_hstemhm:
case t2_op_vstemhm:
{
/* if the number of arguments is no even, the first one */
/* is simply the glyph width.. encoded as the difference */
/* to nominalWidthX */
FT_TRACE4(( op == t2_op_hstem ? " hstem" :
op == t2_op_vstem ? " vstem" :
op == t2_op_hstemhm ? " hstemhm" :
" vstemhm" ));
decoder->num_hints += num_args/2;
args = stack;
}
break;
case t2_op_hintmask:
case t2_op_cntrmask:
{
FT_TRACE4(( op == t2_op_hintmask ? " hintmask" : " cntrmask" ));
decoder->num_hints += num_args/2;
ip += (decoder->num_hints+7) >> 3;
if (ip >= limit) goto Syntax_Error;
args = stack;
}
break;
case t2_op_rmoveto:
{
FT_TRACE4(( " rmoveto" ));
close_contour( builder );
builder->path_begun = 0;
x += args[0];
y += args[1];
args = stack;
}
break;
case t2_op_vmoveto:
{
FT_TRACE4(( " vmoveto" ));
close_contour( builder );
builder->path_begun = 0;
y += args[0];
args = stack;
}
break;
case t2_op_hmoveto:
{
FT_TRACE4(( " vmoveto" ));
close_contour( builder );
builder->path_begun = 0;
x += args[0];
args = stack;
}
break;
case t2_op_rlineto:
{
FT_TRACE4(( " rlineto" ));
if ( start_point ( builder, x, y ) ||
check_points( builder, num_args/2 ) ) goto Memory_Error;
if ( num_args < 2 || num_args & 1 ) goto Stack_Underflow;
args = stack;
while ( args < decoder->top )
{
x += args[0];
y += args[1];
add_point( builder, x, y, 1 );
args += 2;
}
args = stack;
}
break;
case t2_op_hlineto:
case t2_op_vlineto:
{
FT_Int phase = ( op == t2_op_hlineto );
FT_TRACE4(( op == t2_op_hlineto ? " hlineto" : " vlineto" ));
if ( start_point ( builder, x, y ) ||
check_points( builder, num_args ) ) goto Memory_Error;
args = stack;
while (args < decoder->top )
{
if (phase) x += args[0];
else y += args[0];
if (add_point1( builder, x, y )) goto Memory_Error;
args++;
phase ^= 1;
}
args = stack;
}
break;
case t2_op_rrcurveto:
{
FT_TRACE4(( " rrcurveto" ));
/* check number of arguments, must be a multiple of 6 */
if (num_args % 6 != 0) goto Stack_Underflow;
if ( start_point ( builder, x, y ) ||
check_points( builder, num_args/2 ) ) goto Memory_Error;
args = stack;
while (args < decoder->top)
{
x += args[0];
y += args[1];
add_point( builder, x, y, 0 );
x += args[2];
y += args[3];
add_point( builder, x, y, 0 );
x += args[4];
y += args[5];
add_point( builder, x, y, 1 );
args += 6;
}
args = stack;
}
break;
case t2_op_vvcurveto:
{
FT_TRACE4(( " vvcurveto" ));
if ( start_point ( builder, x, y ) ) goto Memory_Error;
args = stack;
if (num_args & 1)
{
x += args[0];
args++;
num_args--;
}
if (num_args % 4 != 0) goto Stack_Underflow;
if (check_points( builder, 3*(num_args/4) )) goto Memory_Error;
while (args < decoder->top)
{
y += args[0];
add_point( builder, x, y, 0 );
x += args[1];
y += args[2];
add_point( builder, x, y, 0 );
y += args[3];
add_point( builder, x, y, 1 );
args += 4;
}
args = stack;
}
break;
case t2_op_hhcurveto:
{
FT_TRACE4(( " hhcurveto" ));
if ( start_point ( builder, x, y ) ) goto Memory_Error;
args = stack;
if (num_args & 1)
{
y += args[0];
args++;
num_args--;
}
if (num_args % 4 != 0) goto Stack_Underflow;
if (check_points( builder, 3*(num_args/4) )) goto Memory_Error;
while (args < decoder->top)
{
x += args[0];
add_point( builder, x, y, 0 );
x += args[1];
y += args[2];
add_point( builder, x, y, 0 );
x += args[3];
add_point( builder, x, y, 1 );
args += 4;
}
args = stack;
}
break;
case t2_op_vhcurveto:
case t2_op_hvcurveto:
{
FT_Int phase;
FT_TRACE4(( op == t2_op_vhcurveto ? " vhcurveto" : " hvcurveto" ));
if ( start_point ( builder, x, y ) ) goto Memory_Error;
args = stack;
if (num_args < 4 || (num_args % 4) > 1 ) goto Stack_Underflow;
if (check_points( builder, (num_args/4)*3 )) goto Stack_Underflow;
phase = ( op == t2_op_hvcurveto );
while (num_args >= 4)
{
num_args -= 4;
if (phase)
{
x += args[0];
add_point( builder, x, y, 0 );
x += args[1];
y += args[2];
add_point( builder, x, y, 0 );
y += args[3];
if (num_args == 1)
x += args[4];
add_point( builder, x, y, 1 );
}
else
{
y += args[0];
add_point( builder, x, y, 0 );
x += args[1];
y += args[2];
add_point( builder, x, y, 0 );
x += args[3];
if (num_args == 1)
y += args[4];
add_point( builder, x, y, 1 );
}
args += 4;
phase ^= 1;
}
args = stack;
}
break;
case t2_op_rlinecurve:
case t2_op_rcurveline:
{
FT_Int mod6 = num_args % 6;
FT_TRACE4(( op == t2_op_rcurveline ? " rcurveline" :
" rlinecurve" ));
if ( num_args < 8 || (mod6 != 0 && mod6 != 2) )
goto Stack_Underflow;
if ( start_point ( builder, x, y ) ||
check_points( builder, (num_args/6)*3 + mod6/2 ) )
goto Memory_Error;
args = stack;
if (op == t2_op_rlinecurve && mod6)
{
x += args[0];
y += args[1];
add_point( builder, x, y, 1 );
args += 2;
num_args -= 2;
}
while (num_args >= 6)
{
x += args[0];
y += args[1];
add_point( builder, x, y, 0 );
x += args[2];
y += args[3];
add_point( builder, x, y, 0 );
x += args[4];
y += args[5];
add_point( builder, x, y, 1 );
args += 6;
num_args -= 6;
}
if ( op == t2_op_rcurveline && num_args)
{
x += args[0];
y += args[1];
add_point( builder, x, y, 1 );
}
args = stack;
}
break;
case t2_op_endchar:
{
FT_TRACE4(( " endchar" ));
close_contour( builder );
/* add current outline to the glyph slot */
builder->base.n_points += builder->current.n_points;
builder->base.n_contours += builder->current.n_contours;
/* return now !! */
FT_TRACE4(( "\n\n" ));
return FT_Err_Ok;
}
case t2_op_abs:
{
FT_TRACE4(( " abs" ));
if (args[0] < 0)
args[0] = -args[0];
args++;
}
break;
case t2_op_add:
{
FT_TRACE4(( " add" ));
args[0] += args[1];
args++;
}
break;
case t2_op_sub:
{
FT_TRACE4(( " sub" ));
args[0] -= args[1];
args++;
}
break;
case t2_op_div:
{
FT_TRACE4(( " div" ));
args[0] = FT_DivFix( args[0], args[1] );
args++;
}
break;
case t2_op_neg:
{
FT_TRACE4(( " neg" ));
args[0] = -args[0];
args++;
}
break;
case t2_op_random:
{
FT_Fixed rand;
FT_TRACE4(( " rand" ));
rand = seed;
if (rand >= 0x8000)
rand++;
args[0] = rand;
seed = FT_MulFix( seed, 0x10000 - seed );
if (seed == 0) seed += 0x2873;
args++;
}
break;
case t2_op_mul:
{
FT_TRACE4(( " mul" ));
args[0] = FT_MulFix( args[0], args[1] );
args++;
}
break;
case t2_op_sqrt:
{
FT_TRACE4(( " sqrt" ));
if (args[0] > 0)
{
FT_Int count = 9;
FT_Fixed root = args[0];
FT_Fixed new_root;
for (;;)
{
new_root = ( root + FT_DivFix(args[0],root) + 1 ) >> 1;
if (new_root == root || count <= 0)
break;
root = new_root;
}
args[0] = new_root;
}
else
args[0] = 0;
args++;
}
break;
case t2_op_drop:
{
/* nothing */
FT_TRACE4(( " drop" ));
}
break;
case t2_op_exch:
{
FT_Fixed tmp;
FT_TRACE4(( " exch" ));
tmp = args[0];
args[0] = args[1];
args[1] = tmp;
args += 2;
}
break;
case t2_op_index:
{
FT_Int index = args[0] >> 16;
FT_TRACE4(( " index" ));
if (index < 0)
index = 0;
else if (index > num_args-2)
index = num_args-2;
args[0] = args[-(index+1)];
args++;
}
break;
case t2_op_roll:
{
FT_Int count = (FT_Int)(args[0] >> 16);
FT_Int index = (FT_Int)(args[1] >> 16);
FT_TRACE4(( " roll" ));
if (count <= 0)
count = 1;
args -= count;
if (args < stack) goto Stack_Underflow;
if (index >= 0)
{
while (index > 0)
{
FT_Fixed tmp = args[count-1];
FT_Int i;
for ( i = count-2; i >= 0; i-- )
args[i+1] = args[i];
args[0] = tmp;
index--;
}
}
else
{
while (index < 0)
{
FT_Fixed tmp = args[0];
FT_Int i;
for ( i = 0; i < count-1; i++ )
args[i] = args[i+1];
args[count-1] = tmp;
index++;
}
}
args += count;
}
break;
case t2_op_dup:
{
FT_TRACE4(( " dup" ));
args[1] = args[0];
args++;
}
break;
case t2_op_put:
{
FT_Fixed val = args[0];
FT_Int index = (FT_Int)(args[1] >> 16);
FT_TRACE4(( " put" ));
if (index >= 0 && index < decoder->len_buildchar)
decoder->buildchar[index] = val;
}
break;
case t2_op_get:
{
FT_Int index = (FT_Int)(args[0] >> 16);
FT_Fixed val = 0;
FT_TRACE4(( " get" ));
if (index >= 0 && index < decoder->len_buildchar)
val = decoder->buildchar[index];
args[0] = val;
args++;
}
break;
case t2_op_store:
FT_TRACE4(( " store "));
goto Unimplemented;
case t2_op_load:
FT_TRACE4(( " load" ));
goto Unimplemented;
case t2_op_and:
{
FT_Fixed cond = args[0] && args[1];
FT_TRACE4(( " and" ));
args[0] = cond ? 0x10000 : 0;
args++;
}
break;
case t2_op_or:
{
FT_Fixed cond = args[0] || args[1];
FT_TRACE4(( " or" ));
args[0] = cond ? 0x10000 : 0;
args++;
}
break;
case t2_op_eq:
{
FT_Fixed cond = !args[0];
FT_TRACE4(( " eq" ));
args[0] = cond ? 0x10000 : 0;
args++;
}
break;
case t2_op_ifelse:
{
FT_Fixed cond = args[2] <= args[3];
FT_TRACE4(( " ifelse" ));
if (!cond)
args[0] = args[1];
args++;
}
break;
case t2_op_callsubr:
{
FT_UInt index = (FT_UInt)((args[0] >> 16) + decoder->locals_bias);
FT_TRACE4(( " callsubr(%d)", index ));
if (index >= decoder->num_locals)
{
FT_ERROR(( "T2.Parse_Charstrings: invalid local subr index\n" ));
goto Syntax_Error;
}
if ( zone - decoder->zones >= T2_MAX_SUBRS_CALLS )
{
FT_ERROR(( "T2.Parse_CharStrings : too many nested subrs\n" ));
goto Syntax_Error;
}
zone->cursor = ip; /* save current instruction pointer */
zone++;
zone->base = decoder->locals[index];
zone->limit = decoder->locals[index+1];
zone->cursor = zone->base;
if (!zone->base)
{
FT_ERROR(( "T2.Parse_CharStrings : invoking empty subrs !!\n" ));
goto Syntax_Error;
}
decoder->zone = zone;
ip = zone->base;
limit = zone->limit;
}
break;
case t2_op_callgsubr:
{
FT_UInt index = (FT_UInt)((args[0] >> 16) + decoder->globals_bias);
FT_TRACE4(( " callgsubr(%d)", index ));
if (index >= decoder->num_globals)
{
FT_ERROR(( "T2.Parse_Charstrings: invalid global subr index\n" ));
goto Syntax_Error;
}
if ( zone - decoder->zones >= T2_MAX_SUBRS_CALLS )
{
FT_ERROR(( "T2.Parse_CharStrings : too many nested subrs\n" ));
goto Syntax_Error;
}
zone->cursor = ip; /* save current instruction pointer */
zone++;
zone->base = decoder->globals[index];
zone->limit = decoder->globals[index+1];
zone->cursor = zone->base;
if (!zone->base)
{
FT_ERROR(( "T2.Parse_CharStrings : invoking empty subrs !!\n" ));
goto Syntax_Error;
}
decoder->zone = zone;
ip = zone->base;
limit = zone->limit;
}
break;
case t2_op_return:
{
FT_TRACE4(( " return" ));
if ( decoder->zone <= decoder->zones )
{
FT_ERROR(( "T2.Parse_CharStrings : unexpected return\n" ));
goto Syntax_Error;
}
decoder->zone--;
zone = decoder->zone;
ip = zone->cursor;
limit = zone->limit;
}
break;
default:
Unimplemented:
FT_ERROR(( "Unimplemented opcode: %d", ip[-1] ));
if (ip[-1] == 12)
{
FT_ERROR(( " %d", ip[0] ));
}
FT_ERROR(( "\n" ));
return FT_Err_Unimplemented_Feature;
}
decoder->top = args;
} /* general operator processing */
} /* while ip < limit */
FT_TRACE4(( "..end..\n\n" ));
return error;
Syntax_Error:
return FT_Err_Invalid_File_Format;
Stack_Underflow:
return T2_Err_Too_Few_Arguments;
Stack_Overflow:
return T2_Err_Stack_Overflow;
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. *********/
/********** *********/
/**********************************************************************/
/**********************************************************************/
/**********************************************************************/
#if 0 /* unused until we support pure CFF fonts */
LOCAL_FUNC
FT_Error T2_Compute_Max_Advance( TT_Face face,
FT_Int *max_advance )
{
FT_Error error = 0;
T2_Decoder decoder;
FT_Int glyph_index;
CFF_Font* cff = (CFF_Font*)face->other;
*max_advance = 0;
/* Initialise load decoder */
T2_Init_Decoder( &decoder, face, 0, 0 );
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 < face->root.num_glyphs; glyph_index++ )
{
FT_Byte* charstring;
FT_ULong charstring_len;
/* now get load the unscaled outline */
error = T2_Access_Element( &cff->charstrings_index, glyph_index,
&charstring, &charstring_len );
if (!error)
{
error = T2_Parse_CharStrings( &decoder, charstring, charstring_len );
T2_Forget_Element( &cff->charstrings_index, &charstring );
}
/* ignore the error if one occured - skip to next glyph */
error = 0;
}
*max_advance = decoder.builder.advance.x;
return FT_Err_Ok;
}
#endif
/**********************************************************************/
/**********************************************************************/
/**********************************************************************/
/********** *********/
/********** *********/
/********** 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 T2_Load_Glyph( T2_GlyphSlot glyph,
T2_Size size,
FT_Int glyph_index,
FT_Int load_flags )
{
FT_Error error;
T2_Decoder decoder;
TT_Face face = (TT_Face)glyph->root.face;
FT_Bool hinting;
CFF_Font* cff = (CFF_Font*)face->other;
if (load_flags & FT_LOAD_NO_RECURSE)
load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
glyph->x_scale = size->metrics.x_scale;
glyph->y_scale = size->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_none;
{
FT_Byte* charstring;
FT_ULong charstring_len;
T2_Init_Decoder( &decoder, face, size, glyph );
decoder.builder.no_recurse = (FT_Bool)!!(load_flags & FT_LOAD_NO_RECURSE);
/* now load the unscaled outline */
error = T2_Access_Element( &cff->charstrings_index, glyph_index,
&charstring, &charstring_len );
if (!error)
{
error = T2_Parse_CharStrings( &decoder, charstring, charstring_len );
T2_Forget_Element( &cff->charstrings_index, &charstring );
}
/* save new glyph tables */
T2_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 )
{
#if 0
glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x;
glyph->root.metrics.horiAdvance = decoder.builder.advance.x;
#else
glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x;
glyph->root.metrics.horiAdvance = decoder.glyph_width;
#endif
}
else
{
FT_BBox cbox;
FT_Glyph_Metrics* metrics = &glyph->root.metrics;
/* copy the _unscaled_ advance width */
#if 0
metrics->horiAdvance = decoder.builder.advance.x;
#else
metrics->horiAdvance = decoder.glyph_width;
#endif
/* 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->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, cff->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 */