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/****************************************************************************
*
* pfrcmap.c
*
* FreeType PFR cmap handling (body).
*
* Copyright (C) 2002-2023 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 "pfrcmap.h"
#include "pfrobjs.h"
#include "pfrerror.h"
FT_CALLBACK_DEF( FT_Error )
pfr_cmap_init( FT_CMap cmap, /* PFR_CMap */
FT_Pointer pointer )
{
PFR_CMap pfrcmap = (PFR_CMap)cmap;
FT_Error error = FT_Err_Ok;
PFR_Face face = (PFR_Face)FT_CMAP_FACE( cmap );
FT_UNUSED( pointer );
pfrcmap->num_chars = face->phy_font.num_chars;
pfrcmap->chars = face->phy_font.chars;
/* just for safety, check that the character entries are correctly */
/* sorted in increasing character code order */
{
FT_UInt n;
for ( n = 1; n < pfrcmap->num_chars; n++ )
{
if ( pfrcmap->chars[n - 1].char_code >= pfrcmap->chars[n].char_code )
{
error = FT_THROW( Invalid_Table );
goto Exit;
}
}
}
Exit:
return error;
}
FT_CALLBACK_DEF( void )
pfr_cmap_done( FT_CMap cmap ) /* PFR_CMap */
{
PFR_CMap pfrcmap = (PFR_CMap)cmap;
pfrcmap->chars = NULL;
pfrcmap->num_chars = 0;
}
FT_CALLBACK_DEF( FT_UInt )
pfr_cmap_char_index( FT_CMap cmap, /* PFR_CMap */
FT_UInt32 char_code )
{
PFR_CMap pfrcmap = (PFR_CMap)cmap;
FT_UInt min = 0;
FT_UInt max = pfrcmap->num_chars;
FT_UInt mid = min + ( max - min ) / 2;
PFR_Char gchar;
while ( min < max )
{
gchar = pfrcmap->chars + mid;
if ( gchar->char_code == char_code )
return mid + 1;
if ( gchar->char_code < char_code )
min = mid + 1;
else
max = mid;
/* reasonable prediction in a continuous block */
mid += char_code - gchar->char_code;
if ( mid >= max || mid < min )
mid = min + ( max - min ) / 2;
}
return 0;
}
FT_CALLBACK_DEF( FT_UInt )
pfr_cmap_char_next( FT_CMap cmap, /* PFR_CMap */
FT_UInt32 *pchar_code )
{
PFR_CMap pfrcmap = (PFR_CMap)cmap;
FT_UInt result = 0;
FT_UInt32 char_code = *pchar_code + 1;
Restart:
{
FT_UInt min = 0;
FT_UInt max = pfrcmap->num_chars;
FT_UInt mid = min + ( max - min ) / 2;
PFR_Char gchar;
while ( min < max )
{
gchar = pfrcmap->chars + mid;
if ( gchar->char_code == char_code )
{
result = mid;
if ( result != 0 )
{
result++;
goto Exit;
}
char_code++;
goto Restart;
}
if ( gchar->char_code < char_code )
min = mid + 1;
else
max = mid;
/* reasonable prediction in a continuous block */
mid += char_code - gchar->char_code;
if ( mid >= max || mid < min )
mid = min + ( max - min ) / 2;
}
/* we didn't find it, but we have a pair just above it */
char_code = 0;
if ( min < pfrcmap->num_chars )
{
gchar = pfrcmap->chars + min;
result = min;
if ( result != 0 )
{
result++;
char_code = gchar->char_code;
}
}
}
Exit:
*pchar_code = char_code;
return result;
}
FT_CALLBACK_TABLE_DEF const FT_CMap_ClassRec
pfr_cmap_class_rec =
{
sizeof ( PFR_CMapRec ),
(FT_CMap_InitFunc) pfr_cmap_init, /* init */
(FT_CMap_DoneFunc) pfr_cmap_done, /* done */
(FT_CMap_CharIndexFunc)pfr_cmap_char_index, /* char_index */
(FT_CMap_CharNextFunc) pfr_cmap_char_next, /* char_next */
(FT_CMap_CharVarIndexFunc) NULL, /* char_var_index */
(FT_CMap_CharVarIsDefaultFunc)NULL, /* char_var_default */
(FT_CMap_VariantListFunc) NULL, /* variant_list */
(FT_CMap_CharVariantListFunc) NULL, /* charvariant_list */
(FT_CMap_VariantCharListFunc) NULL /* variantchar_list */
};
/* END */
|
