ref: bf9b1ef90564987856a42461147435f143e9e7cd
dir: /src/pshinter/pshrec.c/
/****************************************************************************
*
* pshrec.c
*
* FreeType PostScript hints recorder (body).
*
* Copyright (C) 2001-2021 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/freetype.h>
#include <freetype/internal/ftobjs.h>
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftcalc.h>
#include "pshrec.h"
#include "pshalgo.h"
#include "pshnterr.h"
#undef FT_COMPONENT
#define FT_COMPONENT pshrec
#ifdef DEBUG_HINTER
PS_Hints ps_debug_hints = NULL;
int ps_debug_no_horz_hints = 0;
int ps_debug_no_vert_hints = 0;
#endif
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** PS_HINT MANAGEMENT *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* destroy hints table */
static void
ps_hint_table_done( PS_Hint_Table table,
FT_Memory memory )
{
FT_FREE( table->hints );
table->num_hints = 0;
table->max_hints = 0;
}
/* ensure that a table can contain "count" elements */
static FT_Error
ps_hint_table_ensure( PS_Hint_Table table,
FT_UInt count,
FT_Memory memory )
{
FT_UInt old_max = table->max_hints;
FT_UInt new_max = count;
FT_Error error = FT_Err_Ok;
if ( new_max > old_max )
{
/* try to grow the table */
new_max = FT_PAD_CEIL( new_max, 8 );
if ( !FT_RENEW_ARRAY( table->hints, old_max, new_max ) )
table->max_hints = new_max;
}
return error;
}
static FT_Error
ps_hint_table_alloc( PS_Hint_Table table,
FT_Memory memory,
PS_Hint *ahint )
{
FT_Error error = FT_Err_Ok;
FT_UInt count;
PS_Hint hint = NULL;
count = table->num_hints;
count++;
if ( count >= table->max_hints )
{
error = ps_hint_table_ensure( table, count, memory );
if ( error )
goto Exit;
}
hint = table->hints + count - 1;
hint->pos = 0;
hint->len = 0;
hint->flags = 0;
table->num_hints = count;
Exit:
*ahint = hint;
return error;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** PS_MASK MANAGEMENT *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* destroy mask */
static void
ps_mask_done( PS_Mask mask,
FT_Memory memory )
{
FT_FREE( mask->bytes );
mask->num_bits = 0;
mask->max_bits = 0;
mask->end_point = 0;
}
/* ensure that a mask can contain "count" bits */
static FT_Error
ps_mask_ensure( PS_Mask mask,
FT_UInt count,
FT_Memory memory )
{
FT_UInt old_max = ( mask->max_bits + 7 ) >> 3;
FT_UInt new_max = ( count + 7 ) >> 3;
FT_Error error = FT_Err_Ok;
if ( new_max > old_max )
{
new_max = FT_PAD_CEIL( new_max, 8 );
if ( !FT_RENEW_ARRAY( mask->bytes, old_max, new_max ) )
mask->max_bits = new_max * 8;
}
return error;
}
/* test a bit value in a given mask */
static FT_Int
ps_mask_test_bit( PS_Mask mask,
FT_Int idx )
{
if ( (FT_UInt)idx >= mask->num_bits )
return 0;
return mask->bytes[idx >> 3] & ( 0x80 >> ( idx & 7 ) );
}
/* clear a given bit */
static void
ps_mask_clear_bit( PS_Mask mask,
FT_UInt idx )
{
FT_Byte* p;
if ( idx >= mask->num_bits )
return;
p = mask->bytes + ( idx >> 3 );
p[0] = (FT_Byte)( p[0] & ~( 0x80 >> ( idx & 7 ) ) );
}
/* set a given bit, possibly grow the mask */
static FT_Error
ps_mask_set_bit( PS_Mask mask,
FT_UInt idx,
FT_Memory memory )
{
FT_Error error = FT_Err_Ok;
FT_Byte* p;
if ( idx >= mask->num_bits )
{
error = ps_mask_ensure( mask, idx + 1, memory );
if ( error )
goto Exit;
mask->num_bits = idx + 1;
}
p = mask->bytes + ( idx >> 3 );
p[0] = (FT_Byte)( p[0] | ( 0x80 >> ( idx & 7 ) ) );
Exit:
return error;
}
/* destroy mask table */
static void
ps_mask_table_done( PS_Mask_Table table,
FT_Memory memory )
{
FT_UInt count = table->max_masks;
PS_Mask mask = table->masks;
for ( ; count > 0; count--, mask++ )
ps_mask_done( mask, memory );
FT_FREE( table->masks );
table->num_masks = 0;
table->max_masks = 0;
}
/* ensure that a mask table can contain "count" masks */
static FT_Error
ps_mask_table_ensure( PS_Mask_Table table,
FT_UInt count,
FT_Memory memory )
{
FT_UInt old_max = table->max_masks;
FT_UInt new_max = count;
FT_Error error = FT_Err_Ok;
if ( new_max > old_max )
{
new_max = FT_PAD_CEIL( new_max, 8 );
if ( !FT_RENEW_ARRAY( table->masks, old_max, new_max ) )
table->max_masks = new_max;
}
return error;
}
/* allocate a new mask in a table */
static FT_Error
ps_mask_table_alloc( PS_Mask_Table table,
FT_Memory memory,
PS_Mask *amask )
{
FT_UInt count;
FT_Error error = FT_Err_Ok;
PS_Mask mask = NULL;
count = table->num_masks;
count++;
if ( count > table->max_masks )
{
error = ps_mask_table_ensure( table, count, memory );
if ( error )
goto Exit;
}
mask = table->masks + count - 1;
mask->num_bits = 0;
mask->end_point = 0;
table->num_masks = count;
Exit:
*amask = mask;
return error;
}
/* return last hint mask in a table, create one if the table is empty */
static FT_Error
ps_mask_table_last( PS_Mask_Table table,
FT_Memory memory,
PS_Mask *amask )
{
FT_Error error = FT_Err_Ok;
FT_UInt count;
PS_Mask mask;
count = table->num_masks;
if ( count == 0 )
{
error = ps_mask_table_alloc( table, memory, &mask );
if ( error )
goto Exit;
}
else
mask = table->masks + count - 1;
Exit:
*amask = mask;
return error;
}
/* set a new mask to a given bit range */
static FT_Error
ps_mask_table_set_bits( PS_Mask_Table table,
const FT_Byte* source,
FT_UInt bit_pos,
FT_UInt bit_count,
FT_Memory memory )
{
FT_Error error;
PS_Mask mask;
error = ps_mask_table_last( table, memory, &mask );
if ( error )
goto Exit;
error = ps_mask_ensure( mask, bit_count, memory );
if ( error )
goto Exit;
mask->num_bits = bit_count;
/* now, copy bits */
{
FT_Byte* read = (FT_Byte*)source + ( bit_pos >> 3 );
FT_Int rmask = 0x80 >> ( bit_pos & 7 );
FT_Byte* write = mask->bytes;
FT_Int wmask = 0x80;
FT_Int val;
for ( ; bit_count > 0; bit_count-- )
{
val = write[0] & ~wmask;
if ( read[0] & rmask )
val |= wmask;
write[0] = (FT_Byte)val;
rmask >>= 1;
if ( rmask == 0 )
{
read++;
rmask = 0x80;
}
wmask >>= 1;
if ( wmask == 0 )
{
write++;
wmask = 0x80;
}
}
}
Exit:
return error;
}
/* test whether two masks in a table intersect */
static FT_Int
ps_mask_table_test_intersect( PS_Mask_Table table,
FT_UInt index1,
FT_UInt index2 )
{
PS_Mask mask1 = table->masks + index1;
PS_Mask mask2 = table->masks + index2;
FT_Byte* p1 = mask1->bytes;
FT_Byte* p2 = mask2->bytes;
FT_UInt count1 = mask1->num_bits;
FT_UInt count2 = mask2->num_bits;
FT_UInt count;
count = FT_MIN( count1, count2 );
for ( ; count >= 8; count -= 8 )
{
if ( p1[0] & p2[0] )
return 1;
p1++;
p2++;
}
if ( count == 0 )
return 0;
return ( p1[0] & p2[0] ) & ~( 0xFF >> count );
}
/* merge two masks, used by ps_mask_table_merge_all */
static FT_Error
ps_mask_table_merge( PS_Mask_Table table,
FT_UInt index1,
FT_UInt index2,
FT_Memory memory )
{
FT_Error error = FT_Err_Ok;
/* swap index1 and index2 so that index1 < index2 */
if ( index1 > index2 )
{
FT_UInt temp;
temp = index1;
index1 = index2;
index2 = temp;
}
if ( index1 < index2 && index2 < table->num_masks )
{
/* we need to merge the bitsets of index1 and index2 with a */
/* simple union */
PS_Mask mask1 = table->masks + index1;
PS_Mask mask2 = table->masks + index2;
FT_UInt count1 = mask1->num_bits;
FT_UInt count2 = mask2->num_bits;
FT_Int delta;
if ( count2 > 0 )
{
FT_UInt pos;
FT_Byte* read;
FT_Byte* write;
/* if "count2" is greater than "count1", we need to grow the */
/* first bitset, and clear the highest bits */
if ( count2 > count1 )
{
error = ps_mask_ensure( mask1, count2, memory );
if ( error )
goto Exit;
for ( pos = count1; pos < count2; pos++ )
ps_mask_clear_bit( mask1, pos );
}
/* merge (unite) the bitsets */
read = mask2->bytes;
write = mask1->bytes;
pos = ( count2 + 7 ) >> 3;
for ( ; pos > 0; pos-- )
{
write[0] = (FT_Byte)( write[0] | read[0] );
write++;
read++;
}
}
/* Now, remove "mask2" from the list. We need to keep the masks */
/* sorted in order of importance, so move table elements. */
mask2->num_bits = 0;
mask2->end_point = 0;
/* number of masks to move */
delta = (FT_Int)( table->num_masks - 1 - index2 );
if ( delta > 0 )
{
/* move to end of table for reuse */
PS_MaskRec dummy = *mask2;
ft_memmove( mask2,
mask2 + 1,
(FT_UInt)delta * sizeof ( PS_MaskRec ) );
mask2[delta] = dummy;
}
table->num_masks--;
}
else
FT_TRACE0(( "ps_mask_table_merge: ignoring invalid indices (%d,%d)\n",
index1, index2 ));
Exit:
return error;
}
/* Try to merge all masks in a given table. This is used to merge */
/* all counter masks into independent counter "paths". */
/* */
static FT_Error
ps_mask_table_merge_all( PS_Mask_Table table,
FT_Memory memory )
{
FT_UInt index1, index2;
FT_Error error = FT_Err_Ok;
/* the loops stop when unsigned indices wrap around after 0 */
for ( index1 = table->num_masks - 1; index1 < table->num_masks; index1-- )
{
for ( index2 = index1 - 1; index2 < index1; index2-- )
{
if ( ps_mask_table_test_intersect( table, index1, index2 ) )
{
error = ps_mask_table_merge( table, index2, index1, memory );
if ( error )
goto Exit;
break;
}
}
}
Exit:
return error;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** PS_DIMENSION MANAGEMENT *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* finalize a given dimension */
static void
ps_dimension_done( PS_Dimension dimension,
FT_Memory memory )
{
ps_mask_table_done( &dimension->counters, memory );
ps_mask_table_done( &dimension->masks, memory );
ps_hint_table_done( &dimension->hints, memory );
}
/* initialize a given dimension */
static void
ps_dimension_init( PS_Dimension dimension )
{
dimension->hints.num_hints = 0;
dimension->masks.num_masks = 0;
dimension->counters.num_masks = 0;
}
#if 0
/* set a bit at a given index in the current hint mask */
static FT_Error
ps_dimension_set_mask_bit( PS_Dimension dim,
FT_UInt idx,
FT_Memory memory )
{
PS_Mask mask;
FT_Error error = FT_Err_Ok;
/* get last hint mask */
error = ps_mask_table_last( &dim->masks, memory, &mask );
if ( error )
goto Exit;
error = ps_mask_set_bit( mask, idx, memory );
Exit:
return error;
}
#endif
/* set the end point in a mask, called from "End" & "Reset" methods */
static void
ps_dimension_end_mask( PS_Dimension dim,
FT_UInt end_point )
{
FT_UInt count = dim->masks.num_masks;
if ( count > 0 )
{
PS_Mask mask = dim->masks.masks + count - 1;
mask->end_point = end_point;
}
}
/* set the end point in the current mask, then create a new empty one */
/* (called by "Reset" method) */
static FT_Error
ps_dimension_reset_mask( PS_Dimension dim,
FT_UInt end_point,
FT_Memory memory )
{
PS_Mask mask;
/* end current mask */
ps_dimension_end_mask( dim, end_point );
/* allocate new one */
return ps_mask_table_alloc( &dim->masks, memory, &mask );
}
/* set a new mask, called from the "T2Stem" method */
static FT_Error
ps_dimension_set_mask_bits( PS_Dimension dim,
const FT_Byte* source,
FT_UInt source_pos,
FT_UInt source_bits,
FT_UInt end_point,
FT_Memory memory )
{
FT_Error error;
/* reset current mask, if any */
error = ps_dimension_reset_mask( dim, end_point, memory );
if ( error )
goto Exit;
/* set bits in new mask */
error = ps_mask_table_set_bits( &dim->masks, source,
source_pos, source_bits, memory );
Exit:
return error;
}
/* add a new single stem (called from "T1Stem" method) */
static FT_Error
ps_dimension_add_t1stem( PS_Dimension dim,
FT_Int pos,
FT_Int len,
FT_Memory memory,
FT_Int *aindex )
{
FT_Error error = FT_Err_Ok;
FT_UInt flags = 0;
/* detect ghost stem */
if ( len < 0 )
{
flags |= PS_HINT_FLAG_GHOST;
if ( len == -21 )
{
flags |= PS_HINT_FLAG_BOTTOM;
pos = ADD_INT( pos, len );
}
len = 0;
}
if ( aindex )
*aindex = -1;
/* now, lookup stem in the current hints table */
{
PS_Mask mask;
FT_UInt idx;
FT_UInt max = dim->hints.num_hints;
PS_Hint hint = dim->hints.hints;
for ( idx = 0; idx < max; idx++, hint++ )
{
if ( hint->pos == pos && hint->len == len )
break;
}
/* we need to create a new hint in the table */
if ( idx >= max )
{
error = ps_hint_table_alloc( &dim->hints, memory, &hint );
if ( error )
goto Exit;
hint->pos = pos;
hint->len = len;
hint->flags = flags;
}
/* now, store the hint in the current mask */
error = ps_mask_table_last( &dim->masks, memory, &mask );
if ( error )
goto Exit;
error = ps_mask_set_bit( mask, idx, memory );
if ( error )
goto Exit;
if ( aindex )
*aindex = (FT_Int)idx;
}
Exit:
return error;
}
/* add a "hstem3/vstem3" counter to our dimension table */
static FT_Error
ps_dimension_add_counter( PS_Dimension dim,
FT_Int hint1,
FT_Int hint2,
FT_Int hint3,
FT_Memory memory )
{
FT_Error error = FT_Err_Ok;
FT_UInt count = dim->counters.num_masks;
PS_Mask counter = dim->counters.masks;
/* try to find an existing counter mask that already uses */
/* one of these stems here */
for ( ; count > 0; count--, counter++ )
{
if ( ps_mask_test_bit( counter, hint1 ) ||
ps_mask_test_bit( counter, hint2 ) ||
ps_mask_test_bit( counter, hint3 ) )
break;
}
/* create a new counter when needed */
if ( count == 0 )
{
error = ps_mask_table_alloc( &dim->counters, memory, &counter );
if ( error )
goto Exit;
}
/* now, set the bits for our hints in the counter mask */
if ( hint1 >= 0 )
{
error = ps_mask_set_bit( counter, (FT_UInt)hint1, memory );
if ( error )
goto Exit;
}
if ( hint2 >= 0 )
{
error = ps_mask_set_bit( counter, (FT_UInt)hint2, memory );
if ( error )
goto Exit;
}
if ( hint3 >= 0 )
{
error = ps_mask_set_bit( counter, (FT_UInt)hint3, memory );
if ( error )
goto Exit;
}
Exit:
return error;
}
/* end of recording session for a given dimension */
static FT_Error
ps_dimension_end( PS_Dimension dim,
FT_UInt end_point,
FT_Memory memory )
{
/* end hint mask table */
ps_dimension_end_mask( dim, end_point );
/* merge all counter masks into independent "paths" */
return ps_mask_table_merge_all( &dim->counters, memory );
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** PS_RECORDER MANAGEMENT *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* destroy hints */
FT_LOCAL( void )
ps_hints_done( PS_Hints hints )
{
FT_Memory memory = hints->memory;
ps_dimension_done( &hints->dimension[0], memory );
ps_dimension_done( &hints->dimension[1], memory );
hints->error = FT_Err_Ok;
hints->memory = NULL;
}
FT_LOCAL( void )
ps_hints_init( PS_Hints hints,
FT_Memory memory )
{
FT_ZERO( hints );
hints->memory = memory;
}
/* initialize a hints for a new session */
static void
ps_hints_open( PS_Hints hints,
PS_Hint_Type hint_type )
{
hints->error = FT_Err_Ok;
hints->hint_type = hint_type;
ps_dimension_init( &hints->dimension[0] );
ps_dimension_init( &hints->dimension[1] );
}
/* add one or more stems to the current hints table */
static void
ps_hints_stem( PS_Hints hints,
FT_UInt dimension,
FT_Int count,
FT_Long* stems )
{
PS_Dimension dim;
if ( hints->error )
return;
/* limit "dimension" to 0..1 */
if ( dimension > 1 )
{
FT_TRACE0(( "ps_hints_stem: invalid dimension (%d) used\n",
dimension ));
dimension = ( dimension != 0 );
}
/* record the stems in the current hints/masks table */
/* (Type 1 & 2's `hstem' or `vstem' operators) */
dim = &hints->dimension[dimension];
for ( ; count > 0; count--, stems += 2 )
{
FT_Error error;
FT_Memory memory = hints->memory;
error = ps_dimension_add_t1stem( dim,
(FT_Int)stems[0],
(FT_Int)stems[1],
memory,
NULL );
if ( error )
{
FT_ERROR(( "ps_hints_stem: could not add stem"
" (%ld,%ld) to hints table\n", stems[0], stems[1] ));
hints->error = error;
return;
}
}
}
/* add one Type1 counter stem to the current hints table */
static void
ps_hints_t1stem3( PS_Hints hints,
FT_UInt dimension,
FT_Fixed* stems )
{
FT_Error error = FT_Err_Ok;
if ( !hints->error )
{
PS_Dimension dim;
FT_Memory memory = hints->memory;
FT_Int count;
FT_Int idx[3];
/* limit "dimension" to 0..1 */
if ( dimension > 1 )
{
FT_TRACE0(( "ps_hints_t1stem3: invalid dimension (%d) used\n",
dimension ));
dimension = ( dimension != 0 );
}
dim = &hints->dimension[dimension];
/* there must be 6 elements in the 'stem' array */
if ( hints->hint_type == PS_HINT_TYPE_1 )
{
/* add the three stems to our hints/masks table */
for ( count = 0; count < 3; count++, stems += 2 )
{
error = ps_dimension_add_t1stem( dim,
(FT_Int)FIXED_TO_INT( stems[0] ),
(FT_Int)FIXED_TO_INT( stems[1] ),
memory, &idx[count] );
if ( error )
goto Fail;
}
/* now, add the hints to the counters table */
error = ps_dimension_add_counter( dim, idx[0], idx[1], idx[2],
memory );
if ( error )
goto Fail;
}
else
{
FT_ERROR(( "ps_hints_t1stem3: called with invalid hint type\n" ));
error = FT_THROW( Invalid_Argument );
goto Fail;
}
}
return;
Fail:
FT_ERROR(( "ps_hints_t1stem3: could not add counter stems to table\n" ));
hints->error = error;
}
/* reset hints (only with Type 1 hints) */
static void
ps_hints_t1reset( PS_Hints hints,
FT_UInt end_point )
{
FT_Error error = FT_Err_Ok;
if ( !hints->error )
{
FT_Memory memory = hints->memory;
if ( hints->hint_type == PS_HINT_TYPE_1 )
{
error = ps_dimension_reset_mask( &hints->dimension[0],
end_point, memory );
if ( error )
goto Fail;
error = ps_dimension_reset_mask( &hints->dimension[1],
end_point, memory );
if ( error )
goto Fail;
}
else
{
/* invalid hint type */
error = FT_THROW( Invalid_Argument );
goto Fail;
}
}
return;
Fail:
hints->error = error;
}
/* Type2 "hintmask" operator, add a new hintmask to each direction */
static void
ps_hints_t2mask( PS_Hints hints,
FT_UInt end_point,
FT_UInt bit_count,
const FT_Byte* bytes )
{
FT_Error error;
if ( !hints->error )
{
PS_Dimension dim = hints->dimension;
FT_Memory memory = hints->memory;
FT_UInt count1 = dim[0].hints.num_hints;
FT_UInt count2 = dim[1].hints.num_hints;
/* check bit count; must be equal to current total hint count */
if ( bit_count != count1 + count2 )
{
FT_TRACE0(( "ps_hints_t2mask:"
" called with invalid bitcount %d (instead of %d)\n",
bit_count, count1 + count2 ));
/* simply ignore the operator */
return;
}
/* set-up new horizontal and vertical hint mask now */
error = ps_dimension_set_mask_bits( &dim[0], bytes, count2, count1,
end_point, memory );
if ( error )
goto Fail;
error = ps_dimension_set_mask_bits( &dim[1], bytes, 0, count2,
end_point, memory );
if ( error )
goto Fail;
}
return;
Fail:
hints->error = error;
}
static void
ps_hints_t2counter( PS_Hints hints,
FT_UInt bit_count,
const FT_Byte* bytes )
{
FT_Error error;
if ( !hints->error )
{
PS_Dimension dim = hints->dimension;
FT_Memory memory = hints->memory;
FT_UInt count1 = dim[0].hints.num_hints;
FT_UInt count2 = dim[1].hints.num_hints;
/* check bit count, must be equal to current total hint count */
if ( bit_count != count1 + count2 )
{
FT_TRACE0(( "ps_hints_t2counter:"
" called with invalid bitcount %d (instead of %d)\n",
bit_count, count1 + count2 ));
/* simply ignore the operator */
return;
}
/* set-up new horizontal and vertical hint mask now */
error = ps_dimension_set_mask_bits( &dim[0], bytes, 0, count1,
0, memory );
if ( error )
goto Fail;
error = ps_dimension_set_mask_bits( &dim[1], bytes, count1, count2,
0, memory );
if ( error )
goto Fail;
}
return;
Fail:
hints->error = error;
}
/* end recording session */
static FT_Error
ps_hints_close( PS_Hints hints,
FT_UInt end_point )
{
FT_Error error;
error = hints->error;
if ( !error )
{
FT_Memory memory = hints->memory;
PS_Dimension dim = hints->dimension;
error = ps_dimension_end( &dim[0], end_point, memory );
if ( !error )
{
error = ps_dimension_end( &dim[1], end_point, memory );
}
}
#ifdef DEBUG_HINTER
if ( !error )
ps_debug_hints = hints;
#endif
return error;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** TYPE 1 HINTS RECORDING INTERFACE *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static void
t1_hints_open( T1_Hints hints )
{
ps_hints_open( (PS_Hints)hints, PS_HINT_TYPE_1 );
}
static void
t1_hints_stem( T1_Hints hints,
FT_UInt dimension,
FT_Fixed* coords )
{
FT_Pos stems[2];
stems[0] = FIXED_TO_INT( coords[0] );
stems[1] = FIXED_TO_INT( coords[1] );
ps_hints_stem( (PS_Hints)hints, dimension, 1, stems );
}
FT_LOCAL_DEF( void )
t1_hints_funcs_init( T1_Hints_FuncsRec* funcs )
{
FT_ZERO( funcs );
funcs->open = (T1_Hints_OpenFunc) t1_hints_open;
funcs->close = (T1_Hints_CloseFunc) ps_hints_close;
funcs->stem = (T1_Hints_SetStemFunc) t1_hints_stem;
funcs->stem3 = (T1_Hints_SetStem3Func)ps_hints_t1stem3;
funcs->reset = (T1_Hints_ResetFunc) ps_hints_t1reset;
funcs->apply = (T1_Hints_ApplyFunc) ps_hints_apply;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** TYPE 2 HINTS RECORDING INTERFACE *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static void
t2_hints_open( T2_Hints hints )
{
ps_hints_open( (PS_Hints)hints, PS_HINT_TYPE_2 );
}
static void
t2_hints_stems( T2_Hints hints,
FT_UInt dimension,
FT_Int count,
FT_Fixed* coords )
{
FT_Pos stems[32], y;
FT_Int total = count, n;
y = 0;
while ( total > 0 )
{
/* determine number of stems to write */
count = total;
if ( count > 16 )
count = 16;
/* compute integer stem positions in font units */
for ( n = 0; n < count * 2; n++ )
{
y = ADD_LONG( y, coords[n] );
stems[n] = FIXED_TO_INT( y );
}
/* compute lengths */
for ( n = 0; n < count * 2; n += 2 )
stems[n + 1] = stems[n + 1] - stems[n];
/* add them to the current dimension */
ps_hints_stem( (PS_Hints)hints, dimension, count, stems );
total -= count;
}
}
FT_LOCAL_DEF( void )
t2_hints_funcs_init( T2_Hints_FuncsRec* funcs )
{
FT_ZERO( funcs );
funcs->open = (T2_Hints_OpenFunc) t2_hints_open;
funcs->close = (T2_Hints_CloseFunc) ps_hints_close;
funcs->stems = (T2_Hints_StemsFunc) t2_hints_stems;
funcs->hintmask= (T2_Hints_MaskFunc) ps_hints_t2mask;
funcs->counter = (T2_Hints_CounterFunc)ps_hints_t2counter;
funcs->apply = (T2_Hints_ApplyFunc) ps_hints_apply;
}
/* END */