forked from minhngoc25a/freetype2
1549 lines
55 KiB
C
1549 lines
55 KiB
C
/***************************************************************************/
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/* */
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/* ttgxvar.c */
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/* */
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/* TrueType GX Font Variation loader */
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/* */
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/* Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010 by */
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/* David Turner, Robert Wilhelm, Werner Lemberg, and George Williams. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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/*************************************************************************/
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/* */
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/* Apple documents the `fvar', `gvar', `cvar', and `avar' tables at */
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/* */
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/* http://developer.apple.com/fonts/TTRefMan/RM06/Chap6[fgca]var.html */
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/* */
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/* The documentation for `fvar' is inconsistent. At one point it says */
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/* that `countSizePairs' should be 3, at another point 2. It should */
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/* be 2. */
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/* */
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/* The documentation for `gvar' is not intelligible; `cvar' refers you */
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/* to `gvar' and is thus also incomprehensible. */
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/* */
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/* The documentation for `avar' appears correct, but Apple has no fonts */
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/* with an `avar' table, so it is hard to test. */
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/* */
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/* Many thanks to John Jenkins (at Apple) in figuring this out. */
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/* */
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/* */
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/* Apple's `kern' table has some references to tuple indices, but as */
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/* there is no indication where these indices are defined, nor how to */
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/* interpolate the kerning values (different tuples have different */
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/* classes) this issue is ignored. */
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/* */
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/*************************************************************************/
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#include <ft2build.h>
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#include FT_INTERNAL_DEBUG_H
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#include FT_CONFIG_CONFIG_H
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#include FT_INTERNAL_STREAM_H
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#include FT_INTERNAL_SFNT_H
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#include FT_TRUETYPE_TAGS_H
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#include FT_MULTIPLE_MASTERS_H
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#include "ttpload.h"
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#include "ttgxvar.h"
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#include "tterrors.h"
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#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
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#define FT_Stream_FTell( stream ) \
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( (stream)->cursor - (stream)->base )
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#define FT_Stream_SeekSet( stream, off ) \
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( (stream)->cursor = (stream)->base+(off) )
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/*************************************************************************/
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/* */
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/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
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/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
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/* messages during execution. */
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/* */
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_ttgxvar
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** Internal Routines *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/* */
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/* The macro ALL_POINTS is used in `ft_var_readpackedpoints'. It */
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/* indicates that there is a delta for every point without needing to */
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/* enumerate all of them. */
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/* */
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#define ALL_POINTS (FT_UShort*)( -1 )
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#define GX_PT_POINTS_ARE_WORDS 0x80
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#define GX_PT_POINT_RUN_COUNT_MASK 0x7F
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/*************************************************************************/
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/* */
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/* <Function> */
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/* ft_var_readpackedpoints */
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/* */
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/* <Description> */
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/* Read a set of points to which the following deltas will apply. */
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/* Points are packed with a run length encoding. */
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/* */
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/* <Input> */
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/* stream :: The data stream. */
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/* */
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/* <Output> */
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/* point_cnt :: The number of points read. A zero value means that */
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/* all points in the glyph will be affected, without */
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/* enumerating them individually. */
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/* */
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/* <Return> */
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/* An array of FT_UShort containing the affected points or the */
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/* special value ALL_POINTS. */
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/* */
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static FT_UShort*
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ft_var_readpackedpoints( FT_Stream stream,
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FT_UInt *point_cnt )
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{
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FT_UShort *points;
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FT_Int n;
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FT_Int runcnt;
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FT_Int i;
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FT_Int j;
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FT_Int first;
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FT_Memory memory = stream->memory;
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FT_Error error = TT_Err_Ok;
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FT_UNUSED( error );
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*point_cnt = n = FT_GET_BYTE();
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if ( n == 0 )
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return ALL_POINTS;
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if ( n & GX_PT_POINTS_ARE_WORDS )
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n = FT_GET_BYTE() | ( ( n & GX_PT_POINT_RUN_COUNT_MASK ) << 8 );
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if ( FT_NEW_ARRAY( points, n ) )
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return NULL;
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i = 0;
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while ( i < n )
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{
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runcnt = FT_GET_BYTE();
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if ( runcnt & GX_PT_POINTS_ARE_WORDS )
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{
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runcnt = runcnt & GX_PT_POINT_RUN_COUNT_MASK;
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first = points[i++] = FT_GET_USHORT();
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if ( runcnt < 1 || i + runcnt >= n )
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goto Exit;
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/* first point not included in runcount */
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for ( j = 0; j < runcnt; ++j )
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points[i++] = (FT_UShort)( first += FT_GET_USHORT() );
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}
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else
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{
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first = points[i++] = FT_GET_BYTE();
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if ( runcnt < 1 || i + runcnt >= n )
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goto Exit;
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for ( j = 0; j < runcnt; ++j )
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points[i++] = (FT_UShort)( first += FT_GET_BYTE() );
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}
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}
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Exit:
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return points;
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}
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enum
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{
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GX_DT_DELTAS_ARE_ZERO = 0x80,
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GX_DT_DELTAS_ARE_WORDS = 0x40,
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GX_DT_DELTA_RUN_COUNT_MASK = 0x3F
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};
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/*************************************************************************/
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/* */
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/* <Function> */
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/* ft_var_readpackeddeltas */
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/* */
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/* <Description> */
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/* Read a set of deltas. These are packed slightly differently than */
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/* points. In particular there is no overall count. */
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/* */
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/* <Input> */
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/* stream :: The data stream. */
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/* */
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/* delta_cnt :: The number of to be read. */
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/* */
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/* <Return> */
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/* An array of FT_Short containing the deltas for the affected */
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/* points. (This only gets the deltas for one dimension. It will */
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/* generally be called twice, once for x, once for y. When used in */
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/* cvt table, it will only be called once.) */
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/* */
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static FT_Short*
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ft_var_readpackeddeltas( FT_Stream stream,
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FT_Offset delta_cnt )
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{
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FT_Short *deltas = NULL;
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FT_UInt runcnt;
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FT_Offset i;
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FT_UInt j;
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FT_Memory memory = stream->memory;
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FT_Error error = TT_Err_Ok;
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FT_UNUSED( error );
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if ( FT_NEW_ARRAY( deltas, delta_cnt ) )
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return NULL;
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i = 0;
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while ( i < delta_cnt )
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{
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runcnt = FT_GET_BYTE();
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if ( runcnt & GX_DT_DELTAS_ARE_ZERO )
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{
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/* runcnt zeroes get added */
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for ( j = 0;
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j <= ( runcnt & GX_DT_DELTA_RUN_COUNT_MASK ) && i < delta_cnt;
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++j )
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deltas[i++] = 0;
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}
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else if ( runcnt & GX_DT_DELTAS_ARE_WORDS )
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{
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/* runcnt shorts from the stack */
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for ( j = 0;
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j <= ( runcnt & GX_DT_DELTA_RUN_COUNT_MASK ) && i < delta_cnt;
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++j )
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deltas[i++] = FT_GET_SHORT();
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}
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else
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{
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/* runcnt signed bytes from the stack */
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for ( j = 0;
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j <= ( runcnt & GX_DT_DELTA_RUN_COUNT_MASK ) && i < delta_cnt;
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++j )
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deltas[i++] = FT_GET_CHAR();
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}
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if ( j <= ( runcnt & GX_DT_DELTA_RUN_COUNT_MASK ) )
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{
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/* Bad format */
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FT_FREE( deltas );
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return NULL;
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}
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}
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return deltas;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* ft_var_load_avar */
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/* */
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/* <Description> */
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/* Parse the `avar' table if present. It need not be, so we return */
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/* nothing. */
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/* */
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/* <InOut> */
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/* face :: The font face. */
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/* */
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static void
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ft_var_load_avar( TT_Face face )
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{
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FT_Stream stream = FT_FACE_STREAM(face);
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FT_Memory memory = stream->memory;
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GX_Blend blend = face->blend;
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GX_AVarSegment segment;
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FT_Error error = TT_Err_Ok;
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FT_ULong version;
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FT_Long axisCount;
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FT_Int i, j;
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FT_ULong table_len;
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FT_UNUSED( error );
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blend->avar_checked = TRUE;
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if ( (error = face->goto_table( face, TTAG_avar, stream, &table_len )) != 0 )
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return;
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if ( FT_FRAME_ENTER( table_len ) )
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return;
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version = FT_GET_LONG();
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axisCount = FT_GET_LONG();
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if ( version != 0x00010000L ||
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axisCount != (FT_Long)blend->mmvar->num_axis )
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goto Exit;
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if ( FT_NEW_ARRAY( blend->avar_segment, axisCount ) )
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goto Exit;
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segment = &blend->avar_segment[0];
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for ( i = 0; i < axisCount; ++i, ++segment )
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{
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segment->pairCount = FT_GET_USHORT();
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if ( FT_NEW_ARRAY( segment->correspondence, segment->pairCount ) )
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{
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/* Failure. Free everything we have done so far. We must do */
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/* it right now since loading the `avar' table is optional. */
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for ( j = i - 1; j >= 0; --j )
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FT_FREE( blend->avar_segment[j].correspondence );
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FT_FREE( blend->avar_segment );
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blend->avar_segment = NULL;
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goto Exit;
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}
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for ( j = 0; j < segment->pairCount; ++j )
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{
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segment->correspondence[j].fromCoord =
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FT_GET_SHORT() << 2; /* convert to Fixed */
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segment->correspondence[j].toCoord =
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FT_GET_SHORT()<<2; /* convert to Fixed */
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}
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}
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Exit:
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FT_FRAME_EXIT();
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}
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typedef struct GX_GVar_Head_
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{
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FT_Long version;
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FT_UShort axisCount;
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FT_UShort globalCoordCount;
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FT_ULong offsetToCoord;
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FT_UShort glyphCount;
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FT_UShort flags;
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FT_ULong offsetToData;
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} GX_GVar_Head;
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/*************************************************************************/
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/* */
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/* <Function> */
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/* ft_var_load_gvar */
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/* */
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/* <Description> */
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/* Parses the `gvar' table if present. If `fvar' is there, `gvar' */
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/* had better be there too. */
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/* */
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/* <InOut> */
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/* face :: The font face. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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static FT_Error
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ft_var_load_gvar( TT_Face face )
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{
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FT_Stream stream = FT_FACE_STREAM(face);
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FT_Memory memory = stream->memory;
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GX_Blend blend = face->blend;
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FT_Error error;
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FT_UInt i, j;
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FT_ULong table_len;
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FT_ULong gvar_start;
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FT_ULong offsetToData;
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GX_GVar_Head gvar_head;
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static const FT_Frame_Field gvar_fields[] =
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{
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#undef FT_STRUCTURE
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#define FT_STRUCTURE GX_GVar_Head
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FT_FRAME_START( 20 ),
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FT_FRAME_LONG ( version ),
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FT_FRAME_USHORT( axisCount ),
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FT_FRAME_USHORT( globalCoordCount ),
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FT_FRAME_ULONG ( offsetToCoord ),
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FT_FRAME_USHORT( glyphCount ),
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FT_FRAME_USHORT( flags ),
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FT_FRAME_ULONG ( offsetToData ),
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FT_FRAME_END
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};
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if ( (error = face->goto_table( face, TTAG_gvar, stream, &table_len )) != 0 )
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goto Exit;
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gvar_start = FT_STREAM_POS( );
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if ( FT_STREAM_READ_FIELDS( gvar_fields, &gvar_head ) )
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goto Exit;
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blend->tuplecount = gvar_head.globalCoordCount;
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blend->gv_glyphcnt = gvar_head.glyphCount;
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offsetToData = gvar_start + gvar_head.offsetToData;
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if ( gvar_head.version != (FT_Long)0x00010000L ||
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gvar_head.axisCount != (FT_UShort)blend->mmvar->num_axis )
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{
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error = TT_Err_Invalid_Table;
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goto Exit;
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}
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if ( FT_NEW_ARRAY( blend->glyphoffsets, blend->gv_glyphcnt + 1 ) )
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goto Exit;
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if ( gvar_head.flags & 1 )
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{
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/* long offsets (one more offset than glyphs, to mark size of last) */
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if ( FT_FRAME_ENTER( ( blend->gv_glyphcnt + 1 ) * 4L ) )
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goto Exit;
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for ( i = 0; i <= blend->gv_glyphcnt; ++i )
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blend->glyphoffsets[i] = offsetToData + FT_GET_LONG();
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FT_FRAME_EXIT();
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}
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else
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{
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/* short offsets (one more offset than glyphs, to mark size of last) */
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if ( FT_FRAME_ENTER( ( blend->gv_glyphcnt + 1 ) * 2L ) )
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goto Exit;
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for ( i = 0; i <= blend->gv_glyphcnt; ++i )
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blend->glyphoffsets[i] = offsetToData + FT_GET_USHORT() * 2;
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/* XXX: Undocumented: `*2'! */
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FT_FRAME_EXIT();
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}
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|
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if ( blend->tuplecount != 0 )
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{
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if ( FT_NEW_ARRAY( blend->tuplecoords,
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gvar_head.axisCount * blend->tuplecount ) )
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goto Exit;
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|
|
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if ( FT_STREAM_SEEK( gvar_start + gvar_head.offsetToCoord ) ||
|
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FT_FRAME_ENTER( blend->tuplecount * gvar_head.axisCount * 2L ) )
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goto Exit;
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|
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for ( i = 0; i < blend->tuplecount; ++i )
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for ( j = 0 ; j < (FT_UInt)gvar_head.axisCount; ++j )
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blend->tuplecoords[i * gvar_head.axisCount + j] =
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FT_GET_SHORT() << 2; /* convert to FT_Fixed */
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FT_FRAME_EXIT();
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}
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|
|
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Exit:
|
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return error;
|
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}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* ft_var_apply_tuple */
|
|
/* */
|
|
/* <Description> */
|
|
/* Figure out whether a given tuple (design) applies to the current */
|
|
/* blend, and if so, what is the scaling factor. */
|
|
/* */
|
|
/* <Input> */
|
|
/* blend :: The current blend of the font. */
|
|
/* */
|
|
/* tupleIndex :: A flag saying whether this is an intermediate */
|
|
/* tuple or not. */
|
|
/* */
|
|
/* tuple_coords :: The coordinates of the tuple in normalized axis */
|
|
/* units. */
|
|
/* */
|
|
/* im_start_coords :: The initial coordinates where this tuple starts */
|
|
/* to apply (for intermediate coordinates). */
|
|
/* */
|
|
/* im_end_coords :: The final coordinates after which this tuple no */
|
|
/* longer applies (for intermediate coordinates). */
|
|
/* */
|
|
/* <Return> */
|
|
/* An FT_Fixed value containing the scaling factor. */
|
|
/* */
|
|
static FT_Fixed
|
|
ft_var_apply_tuple( GX_Blend blend,
|
|
FT_UShort tupleIndex,
|
|
FT_Fixed* tuple_coords,
|
|
FT_Fixed* im_start_coords,
|
|
FT_Fixed* im_end_coords )
|
|
{
|
|
FT_UInt i;
|
|
FT_Fixed apply;
|
|
FT_Fixed temp;
|
|
|
|
|
|
apply = 0x10000L;
|
|
for ( i = 0; i < blend->num_axis; ++i )
|
|
{
|
|
if ( tuple_coords[i] == 0 )
|
|
/* It's not clear why (for intermediate tuples) we don't need */
|
|
/* to check against start/end -- the documentation says we don't. */
|
|
/* Similarly, it's unclear why we don't need to scale along the */
|
|
/* axis. */
|
|
continue;
|
|
|
|
else if ( blend->normalizedcoords[i] == 0 ||
|
|
( blend->normalizedcoords[i] < 0 && tuple_coords[i] > 0 ) ||
|
|
( blend->normalizedcoords[i] > 0 && tuple_coords[i] < 0 ) )
|
|
{
|
|
apply = 0;
|
|
break;
|
|
}
|
|
|
|
else if ( !( tupleIndex & GX_TI_INTERMEDIATE_TUPLE ) )
|
|
/* not an intermediate tuple */
|
|
apply = FT_MulDiv( apply,
|
|
blend->normalizedcoords[i] > 0
|
|
? blend->normalizedcoords[i]
|
|
: -blend->normalizedcoords[i],
|
|
0x10000L );
|
|
|
|
else if ( blend->normalizedcoords[i] <= im_start_coords[i] ||
|
|
blend->normalizedcoords[i] >= im_end_coords[i] )
|
|
{
|
|
apply = 0;
|
|
break;
|
|
}
|
|
|
|
else if ( blend->normalizedcoords[i] < tuple_coords[i] )
|
|
{
|
|
temp = FT_MulDiv( blend->normalizedcoords[i] - im_start_coords[i],
|
|
0x10000L,
|
|
tuple_coords[i] - im_start_coords[i]);
|
|
apply = FT_MulDiv( apply, temp, 0x10000L );
|
|
}
|
|
|
|
else
|
|
{
|
|
temp = FT_MulDiv( im_end_coords[i] - blend->normalizedcoords[i],
|
|
0x10000L,
|
|
im_end_coords[i] - tuple_coords[i] );
|
|
apply = FT_MulDiv( apply, temp, 0x10000L );
|
|
}
|
|
}
|
|
|
|
return apply;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/***** *****/
|
|
/***** MULTIPLE MASTERS SERVICE FUNCTIONS *****/
|
|
/***** *****/
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
|
|
|
|
typedef struct GX_FVar_Head_
|
|
{
|
|
FT_Long version;
|
|
FT_UShort offsetToData;
|
|
FT_UShort countSizePairs;
|
|
FT_UShort axisCount;
|
|
FT_UShort axisSize;
|
|
FT_UShort instanceCount;
|
|
FT_UShort instanceSize;
|
|
|
|
} GX_FVar_Head;
|
|
|
|
|
|
typedef struct fvar_axis_
|
|
{
|
|
FT_ULong axisTag;
|
|
FT_ULong minValue;
|
|
FT_ULong defaultValue;
|
|
FT_ULong maxValue;
|
|
FT_UShort flags;
|
|
FT_UShort nameID;
|
|
|
|
} GX_FVar_Axis;
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* TT_Get_MM_Var */
|
|
/* */
|
|
/* <Description> */
|
|
/* Check that the font's `fvar' table is valid, parse it, and return */
|
|
/* those data. */
|
|
/* */
|
|
/* <InOut> */
|
|
/* face :: The font face. */
|
|
/* TT_Get_MM_Var initializes the blend structure. */
|
|
/* */
|
|
/* <Output> */
|
|
/* master :: The `fvar' data (must be freed by caller). */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
FT_LOCAL_DEF( FT_Error )
|
|
TT_Get_MM_Var( TT_Face face,
|
|
FT_MM_Var* *master )
|
|
{
|
|
FT_Stream stream = face->root.stream;
|
|
FT_Memory memory = face->root.memory;
|
|
FT_ULong table_len;
|
|
FT_Error error = TT_Err_Ok;
|
|
FT_ULong fvar_start;
|
|
FT_Int i, j;
|
|
FT_MM_Var* mmvar;
|
|
FT_Fixed* next_coords;
|
|
FT_String* next_name;
|
|
FT_Var_Axis* a;
|
|
FT_Var_Named_Style* ns;
|
|
GX_FVar_Head fvar_head;
|
|
|
|
static const FT_Frame_Field fvar_fields[] =
|
|
{
|
|
|
|
#undef FT_STRUCTURE
|
|
#define FT_STRUCTURE GX_FVar_Head
|
|
|
|
FT_FRAME_START( 16 ),
|
|
FT_FRAME_LONG ( version ),
|
|
FT_FRAME_USHORT( offsetToData ),
|
|
FT_FRAME_USHORT( countSizePairs ),
|
|
FT_FRAME_USHORT( axisCount ),
|
|
FT_FRAME_USHORT( axisSize ),
|
|
FT_FRAME_USHORT( instanceCount ),
|
|
FT_FRAME_USHORT( instanceSize ),
|
|
FT_FRAME_END
|
|
};
|
|
|
|
static const FT_Frame_Field fvaraxis_fields[] =
|
|
{
|
|
|
|
#undef FT_STRUCTURE
|
|
#define FT_STRUCTURE GX_FVar_Axis
|
|
|
|
FT_FRAME_START( 20 ),
|
|
FT_FRAME_ULONG ( axisTag ),
|
|
FT_FRAME_ULONG ( minValue ),
|
|
FT_FRAME_ULONG ( defaultValue ),
|
|
FT_FRAME_ULONG ( maxValue ),
|
|
FT_FRAME_USHORT( flags ),
|
|
FT_FRAME_USHORT( nameID ),
|
|
FT_FRAME_END
|
|
};
|
|
|
|
|
|
if ( face->blend == NULL )
|
|
{
|
|
/* both `fvar' and `gvar' must be present */
|
|
if ( (error = face->goto_table( face, TTAG_gvar,
|
|
stream, &table_len )) != 0 )
|
|
goto Exit;
|
|
|
|
if ( (error = face->goto_table( face, TTAG_fvar,
|
|
stream, &table_len )) != 0 )
|
|
goto Exit;
|
|
|
|
fvar_start = FT_STREAM_POS( );
|
|
|
|
if ( FT_STREAM_READ_FIELDS( fvar_fields, &fvar_head ) )
|
|
goto Exit;
|
|
|
|
if ( fvar_head.version != (FT_Long)0x00010000L ||
|
|
fvar_head.countSizePairs != 2 ||
|
|
fvar_head.axisSize != 20 ||
|
|
/* axisCount limit implied by 16-bit instanceSize */
|
|
fvar_head.axisCount > 0x3FFE ||
|
|
fvar_head.instanceSize != 4 + 4 * fvar_head.axisCount ||
|
|
/* instanceCount limit implied by limited range of name IDs */
|
|
fvar_head.instanceCount > 0x7EFF ||
|
|
fvar_head.offsetToData + fvar_head.axisCount * 20U +
|
|
fvar_head.instanceCount * fvar_head.instanceSize > table_len )
|
|
{
|
|
error = TT_Err_Invalid_Table;
|
|
goto Exit;
|
|
}
|
|
|
|
if ( FT_NEW( face->blend ) )
|
|
goto Exit;
|
|
|
|
/* cannot overflow 32-bit arithmetic because of limits above */
|
|
face->blend->mmvar_len =
|
|
sizeof ( FT_MM_Var ) +
|
|
fvar_head.axisCount * sizeof ( FT_Var_Axis ) +
|
|
fvar_head.instanceCount * sizeof ( FT_Var_Named_Style ) +
|
|
fvar_head.instanceCount * fvar_head.axisCount * sizeof ( FT_Fixed ) +
|
|
5 * fvar_head.axisCount;
|
|
|
|
if ( FT_ALLOC( mmvar, face->blend->mmvar_len ) )
|
|
goto Exit;
|
|
face->blend->mmvar = mmvar;
|
|
|
|
mmvar->num_axis =
|
|
fvar_head.axisCount;
|
|
mmvar->num_designs =
|
|
(FT_UInt)-1; /* meaningless in this context; each glyph */
|
|
/* may have a different number of designs */
|
|
/* (or tuples, as called by Apple) */
|
|
mmvar->num_namedstyles =
|
|
fvar_head.instanceCount;
|
|
mmvar->axis =
|
|
(FT_Var_Axis*)&(mmvar[1]);
|
|
mmvar->namedstyle =
|
|
(FT_Var_Named_Style*)&(mmvar->axis[fvar_head.axisCount]);
|
|
|
|
next_coords =
|
|
(FT_Fixed*)&(mmvar->namedstyle[fvar_head.instanceCount]);
|
|
for ( i = 0; i < fvar_head.instanceCount; ++i )
|
|
{
|
|
mmvar->namedstyle[i].coords = next_coords;
|
|
next_coords += fvar_head.axisCount;
|
|
}
|
|
|
|
next_name = (FT_String*)next_coords;
|
|
for ( i = 0; i < fvar_head.axisCount; ++i )
|
|
{
|
|
mmvar->axis[i].name = next_name;
|
|
next_name += 5;
|
|
}
|
|
|
|
if ( FT_STREAM_SEEK( fvar_start + fvar_head.offsetToData ) )
|
|
goto Exit;
|
|
|
|
a = mmvar->axis;
|
|
for ( i = 0; i < fvar_head.axisCount; ++i )
|
|
{
|
|
GX_FVar_Axis axis_rec;
|
|
|
|
|
|
if ( FT_STREAM_READ_FIELDS( fvaraxis_fields, &axis_rec ) )
|
|
goto Exit;
|
|
a->tag = axis_rec.axisTag;
|
|
a->minimum = axis_rec.minValue; /* A Fixed */
|
|
a->def = axis_rec.defaultValue; /* A Fixed */
|
|
a->maximum = axis_rec.maxValue; /* A Fixed */
|
|
a->strid = axis_rec.nameID;
|
|
|
|
a->name[0] = (FT_String)( a->tag >> 24 );
|
|
a->name[1] = (FT_String)( ( a->tag >> 16 ) & 0xFF );
|
|
a->name[2] = (FT_String)( ( a->tag >> 8 ) & 0xFF );
|
|
a->name[3] = (FT_String)( ( a->tag ) & 0xFF );
|
|
a->name[4] = 0;
|
|
|
|
++a;
|
|
}
|
|
|
|
ns = mmvar->namedstyle;
|
|
for ( i = 0; i < fvar_head.instanceCount; ++i, ++ns )
|
|
{
|
|
if ( FT_FRAME_ENTER( 4L + 4L * fvar_head.axisCount ) )
|
|
goto Exit;
|
|
|
|
ns->strid = FT_GET_USHORT();
|
|
(void) /* flags = */ FT_GET_USHORT();
|
|
|
|
for ( j = 0; j < fvar_head.axisCount; ++j )
|
|
ns->coords[j] = FT_GET_ULONG(); /* A Fixed */
|
|
|
|
FT_FRAME_EXIT();
|
|
}
|
|
}
|
|
|
|
if ( master != NULL )
|
|
{
|
|
FT_UInt n;
|
|
|
|
|
|
if ( FT_ALLOC( mmvar, face->blend->mmvar_len ) )
|
|
goto Exit;
|
|
FT_MEM_COPY( mmvar, face->blend->mmvar, face->blend->mmvar_len );
|
|
|
|
mmvar->axis =
|
|
(FT_Var_Axis*)&(mmvar[1]);
|
|
mmvar->namedstyle =
|
|
(FT_Var_Named_Style*)&(mmvar->axis[mmvar->num_axis]);
|
|
next_coords =
|
|
(FT_Fixed*)&(mmvar->namedstyle[mmvar->num_namedstyles]);
|
|
|
|
for ( n = 0; n < mmvar->num_namedstyles; ++n )
|
|
{
|
|
mmvar->namedstyle[n].coords = next_coords;
|
|
next_coords += mmvar->num_axis;
|
|
}
|
|
|
|
a = mmvar->axis;
|
|
next_name = (FT_String*)next_coords;
|
|
for ( n = 0; n < mmvar->num_axis; ++n )
|
|
{
|
|
a->name = next_name;
|
|
|
|
/* standard PostScript names for some standard apple tags */
|
|
if ( a->tag == TTAG_wght )
|
|
a->name = (char *)"Weight";
|
|
else if ( a->tag == TTAG_wdth )
|
|
a->name = (char *)"Width";
|
|
else if ( a->tag == TTAG_opsz )
|
|
a->name = (char *)"OpticalSize";
|
|
else if ( a->tag == TTAG_slnt )
|
|
a->name = (char *)"Slant";
|
|
|
|
next_name += 5;
|
|
++a;
|
|
}
|
|
|
|
*master = mmvar;
|
|
}
|
|
|
|
Exit:
|
|
return error;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* TT_Set_MM_Blend */
|
|
/* */
|
|
/* <Description> */
|
|
/* Set the blend (normalized) coordinates for this instance of the */
|
|
/* font. Check that the `gvar' table is reasonable and does some */
|
|
/* initial preparation. */
|
|
/* */
|
|
/* <InOut> */
|
|
/* face :: The font. */
|
|
/* Initialize the blend structure with `gvar' data. */
|
|
/* */
|
|
/* <Input> */
|
|
/* num_coords :: Must be the axis count of the font. */
|
|
/* */
|
|
/* coords :: An array of num_coords, each between [-1,1]. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
FT_LOCAL_DEF( FT_Error )
|
|
TT_Set_MM_Blend( TT_Face face,
|
|
FT_UInt num_coords,
|
|
FT_Fixed* coords )
|
|
{
|
|
FT_Error error = TT_Err_Ok;
|
|
GX_Blend blend;
|
|
FT_MM_Var* mmvar;
|
|
FT_UInt i;
|
|
FT_Memory memory = face->root.memory;
|
|
|
|
enum
|
|
{
|
|
mcvt_retain,
|
|
mcvt_modify,
|
|
mcvt_load
|
|
|
|
} manageCvt;
|
|
|
|
|
|
face->doblend = FALSE;
|
|
|
|
if ( face->blend == NULL )
|
|
{
|
|
if ( (error = TT_Get_MM_Var( face, NULL)) != 0 )
|
|
goto Exit;
|
|
}
|
|
|
|
blend = face->blend;
|
|
mmvar = blend->mmvar;
|
|
|
|
if ( num_coords != mmvar->num_axis )
|
|
{
|
|
error = TT_Err_Invalid_Argument;
|
|
goto Exit;
|
|
}
|
|
|
|
for ( i = 0; i < num_coords; ++i )
|
|
if ( coords[i] < -0x00010000L || coords[i] > 0x00010000L )
|
|
{
|
|
error = TT_Err_Invalid_Argument;
|
|
goto Exit;
|
|
}
|
|
|
|
if ( blend->glyphoffsets == NULL )
|
|
if ( (error = ft_var_load_gvar( face )) != 0 )
|
|
goto Exit;
|
|
|
|
if ( blend->normalizedcoords == NULL )
|
|
{
|
|
if ( FT_NEW_ARRAY( blend->normalizedcoords, num_coords ) )
|
|
goto Exit;
|
|
|
|
manageCvt = mcvt_modify;
|
|
|
|
/* If we have not set the blend coordinates before this, then the */
|
|
/* cvt table will still be what we read from the `cvt ' table and */
|
|
/* we don't need to reload it. We may need to change it though... */
|
|
}
|
|
else
|
|
{
|
|
manageCvt = mcvt_retain;
|
|
for ( i = 0; i < num_coords; ++i )
|
|
{
|
|
if ( blend->normalizedcoords[i] != coords[i] )
|
|
{
|
|
manageCvt = mcvt_load;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* If we don't change the blend coords then we don't need to do */
|
|
/* anything to the cvt table. It will be correct. Otherwise we */
|
|
/* no longer have the original cvt (it was modified when we set */
|
|
/* the blend last time), so we must reload and then modify it. */
|
|
}
|
|
|
|
blend->num_axis = num_coords;
|
|
FT_MEM_COPY( blend->normalizedcoords,
|
|
coords,
|
|
num_coords * sizeof ( FT_Fixed ) );
|
|
|
|
face->doblend = TRUE;
|
|
|
|
if ( face->cvt != NULL )
|
|
{
|
|
switch ( manageCvt )
|
|
{
|
|
case mcvt_load:
|
|
/* The cvt table has been loaded already; every time we change the */
|
|
/* blend we may need to reload and remodify the cvt table. */
|
|
FT_FREE( face->cvt );
|
|
face->cvt = NULL;
|
|
|
|
tt_face_load_cvt( face, face->root.stream );
|
|
break;
|
|
|
|
case mcvt_modify:
|
|
/* The original cvt table is in memory. All we need to do is */
|
|
/* apply the `cvar' table (if any). */
|
|
tt_face_vary_cvt( face, face->root.stream );
|
|
break;
|
|
|
|
case mcvt_retain:
|
|
/* The cvt table is correct for this set of coordinates. */
|
|
break;
|
|
}
|
|
}
|
|
|
|
Exit:
|
|
return error;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* TT_Set_Var_Design */
|
|
/* */
|
|
/* <Description> */
|
|
/* Set the coordinates for the instance, measured in the user */
|
|
/* coordinate system. Parse the `avar' table (if present) to convert */
|
|
/* from user to normalized coordinates. */
|
|
/* */
|
|
/* <InOut> */
|
|
/* face :: The font face. */
|
|
/* Initialize the blend struct with `gvar' data. */
|
|
/* */
|
|
/* <Input> */
|
|
/* num_coords :: This must be the axis count of the font. */
|
|
/* */
|
|
/* coords :: A coordinate array with `num_coords' elements. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
FT_LOCAL_DEF( FT_Error )
|
|
TT_Set_Var_Design( TT_Face face,
|
|
FT_UInt num_coords,
|
|
FT_Fixed* coords )
|
|
{
|
|
FT_Error error = TT_Err_Ok;
|
|
FT_Fixed* normalized = NULL;
|
|
GX_Blend blend;
|
|
FT_MM_Var* mmvar;
|
|
FT_UInt i, j;
|
|
FT_Var_Axis* a;
|
|
GX_AVarSegment av;
|
|
FT_Memory memory = face->root.memory;
|
|
|
|
|
|
if ( face->blend == NULL )
|
|
{
|
|
if ( (error = TT_Get_MM_Var( face, NULL )) != 0 )
|
|
goto Exit;
|
|
}
|
|
|
|
blend = face->blend;
|
|
mmvar = blend->mmvar;
|
|
|
|
if ( num_coords != mmvar->num_axis )
|
|
{
|
|
error = TT_Err_Invalid_Argument;
|
|
goto Exit;
|
|
}
|
|
|
|
/* Axis normalization is a two stage process. First we normalize */
|
|
/* based on the [min,def,max] values for the axis to be [-1,0,1]. */
|
|
/* Then, if there's an `avar' table, we renormalize this range. */
|
|
|
|
if ( FT_NEW_ARRAY( normalized, mmvar->num_axis ) )
|
|
goto Exit;
|
|
|
|
a = mmvar->axis;
|
|
for ( i = 0; i < mmvar->num_axis; ++i, ++a )
|
|
{
|
|
if ( coords[i] > a->maximum || coords[i] < a->minimum )
|
|
{
|
|
error = TT_Err_Invalid_Argument;
|
|
goto Exit;
|
|
}
|
|
|
|
if ( coords[i] < a->def )
|
|
{
|
|
normalized[i] = -FT_MulDiv( coords[i] - a->def,
|
|
0x10000L,
|
|
a->minimum - a->def );
|
|
}
|
|
else if ( a->maximum == a->def )
|
|
normalized[i] = 0;
|
|
else
|
|
{
|
|
normalized[i] = FT_MulDiv( coords[i] - a->def,
|
|
0x10000L,
|
|
a->maximum - a->def );
|
|
}
|
|
}
|
|
|
|
if ( !blend->avar_checked )
|
|
ft_var_load_avar( face );
|
|
|
|
if ( blend->avar_segment != NULL )
|
|
{
|
|
av = blend->avar_segment;
|
|
for ( i = 0; i < mmvar->num_axis; ++i, ++av )
|
|
{
|
|
for ( j = 1; j < (FT_UInt)av->pairCount; ++j )
|
|
if ( normalized[i] < av->correspondence[j].fromCoord )
|
|
{
|
|
normalized[i] =
|
|
FT_MulDiv(
|
|
FT_MulDiv(
|
|
normalized[i] - av->correspondence[j - 1].fromCoord,
|
|
0x10000L,
|
|
av->correspondence[j].fromCoord -
|
|
av->correspondence[j - 1].fromCoord ),
|
|
av->correspondence[j].toCoord -
|
|
av->correspondence[j - 1].toCoord,
|
|
0x10000L ) +
|
|
av->correspondence[j - 1].toCoord;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
error = TT_Set_MM_Blend( face, num_coords, normalized );
|
|
|
|
Exit:
|
|
FT_FREE( normalized );
|
|
return error;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/***** *****/
|
|
/***** GX VAR PARSING ROUTINES *****/
|
|
/***** *****/
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* tt_face_vary_cvt */
|
|
/* */
|
|
/* <Description> */
|
|
/* Modify the loaded cvt table according to the `cvar' table and the */
|
|
/* font's blend. */
|
|
/* */
|
|
/* <InOut> */
|
|
/* face :: A handle to the target face object. */
|
|
/* */
|
|
/* <Input> */
|
|
/* stream :: A handle to the input stream. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
/* Most errors are ignored. It is perfectly valid not to have a */
|
|
/* `cvar' table even if there is a `gvar' and `fvar' table. */
|
|
/* */
|
|
FT_LOCAL_DEF( FT_Error )
|
|
tt_face_vary_cvt( TT_Face face,
|
|
FT_Stream stream )
|
|
{
|
|
FT_Error error;
|
|
FT_Memory memory = stream->memory;
|
|
FT_ULong table_start;
|
|
FT_ULong table_len;
|
|
FT_UInt tupleCount;
|
|
FT_ULong offsetToData;
|
|
FT_ULong here;
|
|
FT_UInt i, j;
|
|
FT_Fixed* tuple_coords = NULL;
|
|
FT_Fixed* im_start_coords = NULL;
|
|
FT_Fixed* im_end_coords = NULL;
|
|
GX_Blend blend = face->blend;
|
|
FT_UInt point_count;
|
|
FT_UShort* localpoints;
|
|
FT_Short* deltas;
|
|
|
|
|
|
FT_TRACE2(( "CVAR " ));
|
|
|
|
if ( blend == NULL )
|
|
{
|
|
FT_TRACE2(( "tt_face_vary_cvt: no blend specified\n" ));
|
|
|
|
error = TT_Err_Ok;
|
|
goto Exit;
|
|
}
|
|
|
|
if ( face->cvt == NULL )
|
|
{
|
|
FT_TRACE2(( "tt_face_vary_cvt: no `cvt ' table\n" ));
|
|
|
|
error = TT_Err_Ok;
|
|
goto Exit;
|
|
}
|
|
|
|
error = face->goto_table( face, TTAG_cvar, stream, &table_len );
|
|
if ( error )
|
|
{
|
|
FT_TRACE2(( "is missing\n" ));
|
|
|
|
error = TT_Err_Ok;
|
|
goto Exit;
|
|
}
|
|
|
|
if ( FT_FRAME_ENTER( table_len ) )
|
|
{
|
|
error = TT_Err_Ok;
|
|
goto Exit;
|
|
}
|
|
|
|
table_start = FT_Stream_FTell( stream );
|
|
if ( FT_GET_LONG() != 0x00010000L )
|
|
{
|
|
FT_TRACE2(( "bad table version\n" ));
|
|
|
|
error = TT_Err_Ok;
|
|
goto FExit;
|
|
}
|
|
|
|
if ( FT_NEW_ARRAY( tuple_coords, blend->num_axis ) ||
|
|
FT_NEW_ARRAY( im_start_coords, blend->num_axis ) ||
|
|
FT_NEW_ARRAY( im_end_coords, blend->num_axis ) )
|
|
goto FExit;
|
|
|
|
tupleCount = FT_GET_USHORT();
|
|
offsetToData = table_start + FT_GET_USHORT();
|
|
|
|
/* The documentation implies there are flags packed into the */
|
|
/* tuplecount, but John Jenkins says that shared points don't apply */
|
|
/* to `cvar', and no other flags are defined. */
|
|
|
|
for ( i = 0; i < ( tupleCount & 0xFFF ); ++i )
|
|
{
|
|
FT_UInt tupleDataSize;
|
|
FT_UInt tupleIndex;
|
|
FT_Fixed apply;
|
|
|
|
|
|
tupleDataSize = FT_GET_USHORT();
|
|
tupleIndex = FT_GET_USHORT();
|
|
|
|
/* There is no provision here for a global tuple coordinate section, */
|
|
/* so John says. There are no tuple indices, just embedded tuples. */
|
|
|
|
if ( tupleIndex & GX_TI_EMBEDDED_TUPLE_COORD )
|
|
{
|
|
for ( j = 0; j < blend->num_axis; ++j )
|
|
tuple_coords[j] = FT_GET_SHORT() << 2; /* convert from */
|
|
/* short frac to fixed */
|
|
}
|
|
else
|
|
{
|
|
/* skip this tuple; it makes no sense */
|
|
|
|
if ( tupleIndex & GX_TI_INTERMEDIATE_TUPLE )
|
|
for ( j = 0; j < 2 * blend->num_axis; ++j )
|
|
(void)FT_GET_SHORT();
|
|
|
|
offsetToData += tupleDataSize;
|
|
continue;
|
|
}
|
|
|
|
if ( tupleIndex & GX_TI_INTERMEDIATE_TUPLE )
|
|
{
|
|
for ( j = 0; j < blend->num_axis; ++j )
|
|
im_start_coords[j] = FT_GET_SHORT() << 2;
|
|
for ( j = 0; j < blend->num_axis; ++j )
|
|
im_end_coords[j] = FT_GET_SHORT() << 2;
|
|
}
|
|
|
|
apply = ft_var_apply_tuple( blend,
|
|
(FT_UShort)tupleIndex,
|
|
tuple_coords,
|
|
im_start_coords,
|
|
im_end_coords );
|
|
if ( /* tuple isn't active for our blend */
|
|
apply == 0 ||
|
|
/* global points not allowed, */
|
|
/* if they aren't local, makes no sense */
|
|
!( tupleIndex & GX_TI_PRIVATE_POINT_NUMBERS ) )
|
|
{
|
|
offsetToData += tupleDataSize;
|
|
continue;
|
|
}
|
|
|
|
here = FT_Stream_FTell( stream );
|
|
|
|
FT_Stream_SeekSet( stream, offsetToData );
|
|
|
|
localpoints = ft_var_readpackedpoints( stream, &point_count );
|
|
deltas = ft_var_readpackeddeltas( stream,
|
|
point_count == 0 ? face->cvt_size
|
|
: point_count );
|
|
if ( localpoints == NULL || deltas == NULL )
|
|
/* failure, ignore it */;
|
|
|
|
else if ( localpoints == ALL_POINTS )
|
|
{
|
|
/* this means that there are deltas for every entry in cvt */
|
|
for ( j = 0; j < face->cvt_size; ++j )
|
|
face->cvt[j] = (FT_Short)( face->cvt[j] +
|
|
FT_MulFix( deltas[j], apply ) );
|
|
}
|
|
|
|
else
|
|
{
|
|
for ( j = 0; j < point_count; ++j )
|
|
{
|
|
int pindex = localpoints[j];
|
|
|
|
face->cvt[pindex] = (FT_Short)( face->cvt[pindex] +
|
|
FT_MulFix( deltas[j], apply ) );
|
|
}
|
|
}
|
|
|
|
if ( localpoints != ALL_POINTS )
|
|
FT_FREE( localpoints );
|
|
FT_FREE( deltas );
|
|
|
|
offsetToData += tupleDataSize;
|
|
|
|
FT_Stream_SeekSet( stream, here );
|
|
}
|
|
|
|
FExit:
|
|
FT_FRAME_EXIT();
|
|
|
|
Exit:
|
|
FT_FREE( tuple_coords );
|
|
FT_FREE( im_start_coords );
|
|
FT_FREE( im_end_coords );
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* TT_Vary_Get_Glyph_Deltas */
|
|
/* */
|
|
/* <Description> */
|
|
/* Load the appropriate deltas for the current glyph. */
|
|
/* */
|
|
/* <Input> */
|
|
/* face :: A handle to the target face object. */
|
|
/* */
|
|
/* glyph_index :: The index of the glyph being modified. */
|
|
/* */
|
|
/* n_points :: The number of the points in the glyph, including */
|
|
/* phantom points. */
|
|
/* */
|
|
/* <Output> */
|
|
/* deltas :: The array of points to change. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
FT_LOCAL_DEF( FT_Error )
|
|
TT_Vary_Get_Glyph_Deltas( TT_Face face,
|
|
FT_UInt glyph_index,
|
|
FT_Vector* *deltas,
|
|
FT_UInt n_points )
|
|
{
|
|
FT_Stream stream = face->root.stream;
|
|
FT_Memory memory = stream->memory;
|
|
GX_Blend blend = face->blend;
|
|
FT_Vector* delta_xy;
|
|
|
|
FT_Error error;
|
|
FT_ULong glyph_start;
|
|
FT_UInt tupleCount;
|
|
FT_ULong offsetToData;
|
|
FT_ULong here;
|
|
FT_UInt i, j;
|
|
FT_Fixed* tuple_coords = NULL;
|
|
FT_Fixed* im_start_coords = NULL;
|
|
FT_Fixed* im_end_coords = NULL;
|
|
FT_UInt point_count, spoint_count = 0;
|
|
FT_UShort* sharedpoints = NULL;
|
|
FT_UShort* localpoints = NULL;
|
|
FT_UShort* points;
|
|
FT_Short *deltas_x, *deltas_y;
|
|
|
|
|
|
if ( !face->doblend || blend == NULL )
|
|
return TT_Err_Invalid_Argument;
|
|
|
|
/* to be freed by the caller */
|
|
if ( FT_NEW_ARRAY( delta_xy, n_points ) )
|
|
goto Exit;
|
|
*deltas = delta_xy;
|
|
|
|
if ( glyph_index >= blend->gv_glyphcnt ||
|
|
blend->glyphoffsets[glyph_index] ==
|
|
blend->glyphoffsets[glyph_index + 1] )
|
|
return TT_Err_Ok; /* no variation data for this glyph */
|
|
|
|
if ( FT_STREAM_SEEK( blend->glyphoffsets[glyph_index] ) ||
|
|
FT_FRAME_ENTER( blend->glyphoffsets[glyph_index + 1] -
|
|
blend->glyphoffsets[glyph_index] ) )
|
|
goto Fail1;
|
|
|
|
glyph_start = FT_Stream_FTell( stream );
|
|
|
|
/* each set of glyph variation data is formatted similarly to `cvar' */
|
|
/* (except we get shared points and global tuples) */
|
|
|
|
if ( FT_NEW_ARRAY( tuple_coords, blend->num_axis ) ||
|
|
FT_NEW_ARRAY( im_start_coords, blend->num_axis ) ||
|
|
FT_NEW_ARRAY( im_end_coords, blend->num_axis ) )
|
|
goto Fail2;
|
|
|
|
tupleCount = FT_GET_USHORT();
|
|
offsetToData = glyph_start + FT_GET_USHORT();
|
|
|
|
if ( tupleCount & GX_TC_TUPLES_SHARE_POINT_NUMBERS )
|
|
{
|
|
here = FT_Stream_FTell( stream );
|
|
|
|
FT_Stream_SeekSet( stream, offsetToData );
|
|
|
|
sharedpoints = ft_var_readpackedpoints( stream, &spoint_count );
|
|
offsetToData = FT_Stream_FTell( stream );
|
|
|
|
FT_Stream_SeekSet( stream, here );
|
|
}
|
|
|
|
for ( i = 0; i < ( tupleCount & GX_TC_TUPLE_COUNT_MASK ); ++i )
|
|
{
|
|
FT_UInt tupleDataSize;
|
|
FT_UInt tupleIndex;
|
|
FT_Fixed apply;
|
|
|
|
|
|
tupleDataSize = FT_GET_USHORT();
|
|
tupleIndex = FT_GET_USHORT();
|
|
|
|
if ( tupleIndex & GX_TI_EMBEDDED_TUPLE_COORD )
|
|
{
|
|
for ( j = 0; j < blend->num_axis; ++j )
|
|
tuple_coords[j] = FT_GET_SHORT() << 2; /* convert from */
|
|
/* short frac to fixed */
|
|
}
|
|
else if ( ( tupleIndex & GX_TI_TUPLE_INDEX_MASK ) >= blend->tuplecount )
|
|
{
|
|
error = TT_Err_Invalid_Table;
|
|
goto Fail3;
|
|
}
|
|
else
|
|
{
|
|
FT_MEM_COPY(
|
|
tuple_coords,
|
|
&blend->tuplecoords[(tupleIndex & 0xFFF) * blend->num_axis],
|
|
blend->num_axis * sizeof ( FT_Fixed ) );
|
|
}
|
|
|
|
if ( tupleIndex & GX_TI_INTERMEDIATE_TUPLE )
|
|
{
|
|
for ( j = 0; j < blend->num_axis; ++j )
|
|
im_start_coords[j] = FT_GET_SHORT() << 2;
|
|
for ( j = 0; j < blend->num_axis; ++j )
|
|
im_end_coords[j] = FT_GET_SHORT() << 2;
|
|
}
|
|
|
|
apply = ft_var_apply_tuple( blend,
|
|
(FT_UShort)tupleIndex,
|
|
tuple_coords,
|
|
im_start_coords,
|
|
im_end_coords );
|
|
|
|
if ( apply == 0 ) /* tuple isn't active for our blend */
|
|
{
|
|
offsetToData += tupleDataSize;
|
|
continue;
|
|
}
|
|
|
|
here = FT_Stream_FTell( stream );
|
|
|
|
if ( tupleIndex & GX_TI_PRIVATE_POINT_NUMBERS )
|
|
{
|
|
FT_Stream_SeekSet( stream, offsetToData );
|
|
|
|
localpoints = ft_var_readpackedpoints( stream, &point_count );
|
|
points = localpoints;
|
|
}
|
|
else
|
|
{
|
|
points = sharedpoints;
|
|
point_count = spoint_count;
|
|
}
|
|
|
|
deltas_x = ft_var_readpackeddeltas( stream,
|
|
point_count == 0 ? n_points
|
|
: point_count );
|
|
deltas_y = ft_var_readpackeddeltas( stream,
|
|
point_count == 0 ? n_points
|
|
: point_count );
|
|
|
|
if ( points == NULL || deltas_y == NULL || deltas_x == NULL )
|
|
; /* failure, ignore it */
|
|
|
|
else if ( points == ALL_POINTS )
|
|
{
|
|
/* this means that there are deltas for every point in the glyph */
|
|
for ( j = 0; j < n_points; ++j )
|
|
{
|
|
delta_xy[j].x += FT_MulFix( deltas_x[j], apply );
|
|
delta_xy[j].y += FT_MulFix( deltas_y[j], apply );
|
|
}
|
|
}
|
|
|
|
else
|
|
{
|
|
for ( j = 0; j < point_count; ++j )
|
|
{
|
|
delta_xy[localpoints[j]].x += FT_MulFix( deltas_x[j], apply );
|
|
delta_xy[localpoints[j]].y += FT_MulFix( deltas_y[j], apply );
|
|
}
|
|
}
|
|
|
|
if ( localpoints != ALL_POINTS )
|
|
FT_FREE( localpoints );
|
|
FT_FREE( deltas_x );
|
|
FT_FREE( deltas_y );
|
|
|
|
offsetToData += tupleDataSize;
|
|
|
|
FT_Stream_SeekSet( stream, here );
|
|
}
|
|
|
|
Fail3:
|
|
FT_FREE( tuple_coords );
|
|
FT_FREE( im_start_coords );
|
|
FT_FREE( im_end_coords );
|
|
|
|
Fail2:
|
|
FT_FRAME_EXIT();
|
|
|
|
Fail1:
|
|
if ( error )
|
|
{
|
|
FT_FREE( delta_xy );
|
|
*deltas = NULL;
|
|
}
|
|
|
|
Exit:
|
|
return error;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* tt_done_blend */
|
|
/* */
|
|
/* <Description> */
|
|
/* Frees the blend internal data structure. */
|
|
/* */
|
|
FT_LOCAL_DEF( void )
|
|
tt_done_blend( FT_Memory memory,
|
|
GX_Blend blend )
|
|
{
|
|
if ( blend != NULL )
|
|
{
|
|
FT_UInt i;
|
|
|
|
|
|
FT_FREE( blend->normalizedcoords );
|
|
FT_FREE( blend->mmvar );
|
|
|
|
if ( blend->avar_segment != NULL )
|
|
{
|
|
for ( i = 0; i < blend->num_axis; ++i )
|
|
FT_FREE( blend->avar_segment[i].correspondence );
|
|
FT_FREE( blend->avar_segment );
|
|
}
|
|
|
|
FT_FREE( blend->tuplecoords );
|
|
FT_FREE( blend->glyphoffsets );
|
|
FT_FREE( blend );
|
|
}
|
|
}
|
|
|
|
#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
|
|
|
|
|
|
/* END */
|