--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libfreetype/src/type1/t1afm.c Mon Apr 25 01:46:54 2011 +0200
@@ -0,0 +1,397 @@
+/***************************************************************************/
+/* */
+/* t1afm.c */
+/* */
+/* AFM support for Type 1 fonts (body). */
+/* */
+/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, */
+/* 2010 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 <ft2build.h>
+#include "t1afm.h"
+#include "t1errors.h"
+#include FT_INTERNAL_STREAM_H
+#include FT_INTERNAL_POSTSCRIPT_AUX_H
+
+
+ /*************************************************************************/
+ /* */
+ /* 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_t1afm
+
+
+ FT_LOCAL_DEF( void )
+ T1_Done_Metrics( FT_Memory memory,
+ AFM_FontInfo fi )
+ {
+ FT_FREE( fi->KernPairs );
+ fi->NumKernPair = 0;
+
+ FT_FREE( fi->TrackKerns );
+ fi->NumTrackKern = 0;
+
+ FT_FREE( fi );
+ }
+
+
+ /* read a glyph name and return the equivalent glyph index */
+ static FT_Int
+ t1_get_index( const char* name,
+ FT_Offset len,
+ void* user_data )
+ {
+ T1_Font type1 = (T1_Font)user_data;
+ FT_Int n;
+
+
+ /* PS string/name length must be < 16-bit */
+ if ( len > 0xFFFFU )
+ return 0;
+
+ for ( n = 0; n < type1->num_glyphs; n++ )
+ {
+ char* gname = (char*)type1->glyph_names[n];
+
+
+ if ( gname && gname[0] == name[0] &&
+ ft_strlen( gname ) == len &&
+ ft_strncmp( gname, name, len ) == 0 )
+ return n;
+ }
+
+ return 0;
+ }
+
+
+#undef KERN_INDEX
+#define KERN_INDEX( g1, g2 ) ( ( (FT_ULong)(g1) << 16 ) | (g2) )
+
+
+ /* compare two kerning pairs */
+ FT_CALLBACK_DEF( int )
+ compare_kern_pairs( const void* a,
+ const void* b )
+ {
+ AFM_KernPair pair1 = (AFM_KernPair)a;
+ AFM_KernPair pair2 = (AFM_KernPair)b;
+
+ FT_ULong index1 = KERN_INDEX( pair1->index1, pair1->index2 );
+ FT_ULong index2 = KERN_INDEX( pair2->index1, pair2->index2 );
+
+
+ if ( index1 > index2 )
+ return 1;
+ else if ( index1 < index2 )
+ return -1;
+ else
+ return 0;
+ }
+
+
+ /* parse a PFM file -- for now, only read the kerning pairs */
+ static FT_Error
+ T1_Read_PFM( FT_Face t1_face,
+ FT_Stream stream,
+ AFM_FontInfo fi )
+ {
+ FT_Error error = T1_Err_Ok;
+ FT_Memory memory = stream->memory;
+ FT_Byte* start;
+ FT_Byte* limit;
+ FT_Byte* p;
+ AFM_KernPair kp;
+ FT_Int width_table_length;
+ FT_CharMap oldcharmap;
+ FT_CharMap charmap;
+ FT_Int n;
+
+
+ start = (FT_Byte*)stream->cursor;
+ limit = (FT_Byte*)stream->limit;
+ p = start;
+
+ /* Figure out how long the width table is. */
+ /* This info is a little-endian short at offset 99. */
+ p = start + 99;
+ if ( p + 2 > limit )
+ {
+ error = T1_Err_Unknown_File_Format;
+ goto Exit;
+ }
+ width_table_length = FT_PEEK_USHORT_LE( p );
+
+ p += 18 + width_table_length;
+ if ( p + 0x12 > limit || FT_PEEK_USHORT_LE( p ) < 0x12 )
+ /* extension table is probably optional */
+ goto Exit;
+
+ /* Kerning offset is 14 bytes from start of extensions table. */
+ p += 14;
+ p = start + FT_PEEK_ULONG_LE( p );
+
+ if ( p == start )
+ /* zero offset means no table */
+ goto Exit;
+
+ if ( p + 2 > limit )
+ {
+ error = T1_Err_Unknown_File_Format;
+ goto Exit;
+ }
+
+ fi->NumKernPair = FT_PEEK_USHORT_LE( p );
+ p += 2;
+ if ( p + 4 * fi->NumKernPair > limit )
+ {
+ error = T1_Err_Unknown_File_Format;
+ goto Exit;
+ }
+
+ /* Actually, kerning pairs are simply optional! */
+ if ( fi->NumKernPair == 0 )
+ goto Exit;
+
+ /* allocate the pairs */
+ if ( FT_QNEW_ARRAY( fi->KernPairs, fi->NumKernPair ) )
+ goto Exit;
+
+ /* now, read each kern pair */
+ kp = fi->KernPairs;
+ limit = p + 4 * fi->NumKernPair;
+
+ /* PFM kerning data are stored by encoding rather than glyph index, */
+ /* so find the PostScript charmap of this font and install it */
+ /* temporarily. If we find no PostScript charmap, then just use */
+ /* the default and hope it is the right one. */
+ oldcharmap = t1_face->charmap;
+ charmap = NULL;
+
+ for ( n = 0; n < t1_face->num_charmaps; n++ )
+ {
+ charmap = t1_face->charmaps[n];
+ /* check against PostScript pseudo platform */
+ if ( charmap->platform_id == 7 )
+ {
+ error = FT_Set_Charmap( t1_face, charmap );
+ if ( error )
+ goto Exit;
+ break;
+ }
+ }
+
+ /* Kerning info is stored as: */
+ /* */
+ /* encoding of first glyph (1 byte) */
+ /* encoding of second glyph (1 byte) */
+ /* offset (little-endian short) */
+ for ( ; p < limit ; p += 4 )
+ {
+ kp->index1 = FT_Get_Char_Index( t1_face, p[0] );
+ kp->index2 = FT_Get_Char_Index( t1_face, p[1] );
+
+ kp->x = (FT_Int)FT_PEEK_SHORT_LE(p + 2);
+ kp->y = 0;
+
+ kp++;
+ }
+
+ if ( oldcharmap != NULL )
+ error = FT_Set_Charmap( t1_face, oldcharmap );
+ if ( error )
+ goto Exit;
+
+ /* now, sort the kern pairs according to their glyph indices */
+ ft_qsort( fi->KernPairs, fi->NumKernPair, sizeof ( AFM_KernPairRec ),
+ compare_kern_pairs );
+
+ Exit:
+ if ( error )
+ {
+ FT_FREE( fi->KernPairs );
+ fi->NumKernPair = 0;
+ }
+
+ return error;
+ }
+
+
+ /* parse a metrics file -- either AFM or PFM depending on what */
+ /* it turns out to be */
+ FT_LOCAL_DEF( FT_Error )
+ T1_Read_Metrics( FT_Face t1_face,
+ FT_Stream stream )
+ {
+ PSAux_Service psaux;
+ FT_Memory memory = stream->memory;
+ AFM_ParserRec parser;
+ AFM_FontInfo fi = NULL;
+ FT_Error error = T1_Err_Unknown_File_Format;
+ T1_Font t1_font = &( (T1_Face)t1_face )->type1;
+
+
+ if ( FT_NEW( fi ) ||
+ FT_FRAME_ENTER( stream->size ) )
+ goto Exit;
+
+ fi->FontBBox = t1_font->font_bbox;
+ fi->Ascender = t1_font->font_bbox.yMax;
+ fi->Descender = t1_font->font_bbox.yMin;
+
+ psaux = (PSAux_Service)( (T1_Face)t1_face )->psaux;
+ if ( psaux && psaux->afm_parser_funcs )
+ {
+ error = psaux->afm_parser_funcs->init( &parser,
+ stream->memory,
+ stream->cursor,
+ stream->limit );
+
+ if ( !error )
+ {
+ parser.FontInfo = fi;
+ parser.get_index = t1_get_index;
+ parser.user_data = t1_font;
+
+ error = psaux->afm_parser_funcs->parse( &parser );
+ psaux->afm_parser_funcs->done( &parser );
+ }
+ }
+
+ if ( error == T1_Err_Unknown_File_Format )
+ {
+ FT_Byte* start = stream->cursor;
+
+
+ /* MS Windows allows versions up to 0x3FF without complaining */
+ if ( stream->size > 6 &&
+ start[1] < 4 &&
+ FT_PEEK_ULONG_LE( start + 2 ) == stream->size )
+ error = T1_Read_PFM( t1_face, stream, fi );
+ }
+
+ if ( !error )
+ {
+ t1_font->font_bbox = fi->FontBBox;
+
+ t1_face->bbox.xMin = fi->FontBBox.xMin >> 16;
+ t1_face->bbox.yMin = fi->FontBBox.yMin >> 16;
+ /* no `U' suffix here to 0xFFFF! */
+ t1_face->bbox.xMax = ( fi->FontBBox.xMax + 0xFFFF ) >> 16;
+ t1_face->bbox.yMax = ( fi->FontBBox.yMax + 0xFFFF ) >> 16;
+
+ /* no `U' suffix here to 0x8000! */
+ t1_face->ascender = (FT_Short)( ( fi->Ascender + 0x8000 ) >> 16 );
+ t1_face->descender = (FT_Short)( ( fi->Descender + 0x8000 ) >> 16 );
+
+ if ( fi->NumKernPair )
+ {
+ t1_face->face_flags |= FT_FACE_FLAG_KERNING;
+ ( (T1_Face)t1_face )->afm_data = fi;
+ fi = NULL;
+ }
+ }
+
+ FT_FRAME_EXIT();
+
+ Exit:
+ if ( fi != NULL )
+ T1_Done_Metrics( memory, fi );
+
+ return error;
+ }
+
+
+ /* find the kerning for a given glyph pair */
+ FT_LOCAL_DEF( void )
+ T1_Get_Kerning( AFM_FontInfo fi,
+ FT_UInt glyph1,
+ FT_UInt glyph2,
+ FT_Vector* kerning )
+ {
+ AFM_KernPair min, mid, max;
+ FT_ULong idx = KERN_INDEX( glyph1, glyph2 );
+
+
+ /* simple binary search */
+ min = fi->KernPairs;
+ max = min + fi->NumKernPair - 1;
+
+ while ( min <= max )
+ {
+ FT_ULong midi;
+
+
+ mid = min + ( max - min ) / 2;
+ midi = KERN_INDEX( mid->index1, mid->index2 );
+
+ if ( midi == idx )
+ {
+ kerning->x = mid->x;
+ kerning->y = mid->y;
+
+ return;
+ }
+
+ if ( midi < idx )
+ min = mid + 1;
+ else
+ max = mid - 1;
+ }
+
+ kerning->x = 0;
+ kerning->y = 0;
+ }
+
+
+ FT_LOCAL_DEF( FT_Error )
+ T1_Get_Track_Kerning( FT_Face face,
+ FT_Fixed ptsize,
+ FT_Int degree,
+ FT_Fixed* kerning )
+ {
+ AFM_FontInfo fi = (AFM_FontInfo)( (T1_Face)face )->afm_data;
+ FT_Int i;
+
+
+ if ( !fi )
+ return T1_Err_Invalid_Argument;
+
+ for ( i = 0; i < fi->NumTrackKern; i++ )
+ {
+ AFM_TrackKern tk = fi->TrackKerns + i;
+
+
+ if ( tk->degree != degree )
+ continue;
+
+ if ( ptsize < tk->min_ptsize )
+ *kerning = tk->min_kern;
+ else if ( ptsize > tk->max_ptsize )
+ *kerning = tk->max_kern;
+ else
+ {
+ *kerning = FT_MulDiv( ptsize - tk->min_ptsize,
+ tk->max_kern - tk->min_kern,
+ tk->max_ptsize - tk->min_ptsize ) +
+ tk->min_kern;
+ }
+ }
+
+ return T1_Err_Ok;
+ }
+
+
+/* END */