--- a/misc/libfreetype/src/truetype/ttgxvar.c Thu Jul 25 23:16:06 2013 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,1548 +0,0 @@
-/***************************************************************************/
-/* */
-/* ttgxvar.c */
-/* */
-/* TrueType GX Font Variation loader */
-/* */
-/* Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010 by */
-/* David Turner, Robert Wilhelm, Werner Lemberg, and George Williams. */
-/* */
-/* 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. */
-/* */
-/***************************************************************************/
-
-
- /*************************************************************************/
- /* */
- /* Apple documents the `fvar', `gvar', `cvar', and `avar' tables at */
- /* */
- /* http://developer.apple.com/fonts/TTRefMan/RM06/Chap6[fgca]var.html */
- /* */
- /* The documentation for `fvar' is inconsistent. At one point it says */
- /* that `countSizePairs' should be 3, at another point 2. It should */
- /* be 2. */
- /* */
- /* The documentation for `gvar' is not intelligible; `cvar' refers you */
- /* to `gvar' and is thus also incomprehensible. */
- /* */
- /* The documentation for `avar' appears correct, but Apple has no fonts */
- /* with an `avar' table, so it is hard to test. */
- /* */
- /* Many thanks to John Jenkins (at Apple) in figuring this out. */
- /* */
- /* */
- /* Apple's `kern' table has some references to tuple indices, but as */
- /* there is no indication where these indices are defined, nor how to */
- /* interpolate the kerning values (different tuples have different */
- /* classes) this issue is ignored. */
- /* */
- /*************************************************************************/
-
-
-#include <ft2build.h>
-#include FT_INTERNAL_DEBUG_H
-#include FT_CONFIG_CONFIG_H
-#include FT_INTERNAL_STREAM_H
-#include FT_INTERNAL_SFNT_H
-#include FT_TRUETYPE_TAGS_H
-#include FT_MULTIPLE_MASTERS_H
-
-#include "ttpload.h"
-#include "ttgxvar.h"
-
-#include "tterrors.h"
-
-
-#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
-
-
-#define FT_Stream_FTell( stream ) \
- ( (stream)->cursor - (stream)->base )
-#define FT_Stream_SeekSet( stream, off ) \
- ( (stream)->cursor = (stream)->base+(off) )
-
-
- /*************************************************************************/
- /* */
- /* 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_ttgxvar
-
-
- /*************************************************************************/
- /*************************************************************************/
- /***** *****/
- /***** Internal Routines *****/
- /***** *****/
- /*************************************************************************/
- /*************************************************************************/
-
-
- /*************************************************************************/
- /* */
- /* The macro ALL_POINTS is used in `ft_var_readpackedpoints'. It */
- /* indicates that there is a delta for every point without needing to */
- /* enumerate all of them. */
- /* */
-#define ALL_POINTS (FT_UShort*)( -1 )
-
-
-#define GX_PT_POINTS_ARE_WORDS 0x80
-#define GX_PT_POINT_RUN_COUNT_MASK 0x7F
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* ft_var_readpackedpoints */
- /* */
- /* <Description> */
- /* Read a set of points to which the following deltas will apply. */
- /* Points are packed with a run length encoding. */
- /* */
- /* <Input> */
- /* stream :: The data stream. */
- /* */
- /* <Output> */
- /* point_cnt :: The number of points read. A zero value means that */
- /* all points in the glyph will be affected, without */
- /* enumerating them individually. */
- /* */
- /* <Return> */
- /* An array of FT_UShort containing the affected points or the */
- /* special value ALL_POINTS. */
- /* */
- static FT_UShort*
- ft_var_readpackedpoints( FT_Stream stream,
- FT_UInt *point_cnt )
- {
- FT_UShort *points;
- FT_Int n;
- FT_Int runcnt;
- FT_Int i;
- FT_Int j;
- FT_Int first;
- FT_Memory memory = stream->memory;
- FT_Error error = TT_Err_Ok;
-
- FT_UNUSED( error );
-
-
- *point_cnt = n = FT_GET_BYTE();
- if ( n == 0 )
- return ALL_POINTS;
-
- if ( n & GX_PT_POINTS_ARE_WORDS )
- n = FT_GET_BYTE() | ( ( n & GX_PT_POINT_RUN_COUNT_MASK ) << 8 );
-
- if ( FT_NEW_ARRAY( points, n ) )
- return NULL;
-
- i = 0;
- while ( i < n )
- {
- runcnt = FT_GET_BYTE();
- if ( runcnt & GX_PT_POINTS_ARE_WORDS )
- {
- runcnt = runcnt & GX_PT_POINT_RUN_COUNT_MASK;
- first = points[i++] = FT_GET_USHORT();
-
- if ( runcnt < 1 || i + runcnt >= n )
- goto Exit;
-
- /* first point not included in runcount */
- for ( j = 0; j < runcnt; ++j )
- points[i++] = (FT_UShort)( first += FT_GET_USHORT() );
- }
- else
- {
- first = points[i++] = FT_GET_BYTE();
-
- if ( runcnt < 1 || i + runcnt >= n )
- goto Exit;
-
- for ( j = 0; j < runcnt; ++j )
- points[i++] = (FT_UShort)( first += FT_GET_BYTE() );
- }
- }
-
- Exit:
- return points;
- }
-
-
- enum
- {
- GX_DT_DELTAS_ARE_ZERO = 0x80,
- GX_DT_DELTAS_ARE_WORDS = 0x40,
- GX_DT_DELTA_RUN_COUNT_MASK = 0x3F
- };
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* ft_var_readpackeddeltas */
- /* */
- /* <Description> */
- /* Read a set of deltas. These are packed slightly differently than */
- /* points. In particular there is no overall count. */
- /* */
- /* <Input> */
- /* stream :: The data stream. */
- /* */
- /* delta_cnt :: The number of to be read. */
- /* */
- /* <Return> */
- /* An array of FT_Short containing the deltas for the affected */
- /* points. (This only gets the deltas for one dimension. It will */
- /* generally be called twice, once for x, once for y. When used in */
- /* cvt table, it will only be called once.) */
- /* */
- static FT_Short*
- ft_var_readpackeddeltas( FT_Stream stream,
- FT_Offset delta_cnt )
- {
- FT_Short *deltas = NULL;
- FT_UInt runcnt;
- FT_Offset i;
- FT_UInt j;
- FT_Memory memory = stream->memory;
- FT_Error error = TT_Err_Ok;
-
- FT_UNUSED( error );
-
-
- if ( FT_NEW_ARRAY( deltas, delta_cnt ) )
- return NULL;
-
- i = 0;
- while ( i < delta_cnt )
- {
- runcnt = FT_GET_BYTE();
- if ( runcnt & GX_DT_DELTAS_ARE_ZERO )
- {
- /* runcnt zeroes get added */
- for ( j = 0;
- j <= ( runcnt & GX_DT_DELTA_RUN_COUNT_MASK ) && i < delta_cnt;
- ++j )
- deltas[i++] = 0;
- }
- else if ( runcnt & GX_DT_DELTAS_ARE_WORDS )
- {
- /* runcnt shorts from the stack */
- for ( j = 0;
- j <= ( runcnt & GX_DT_DELTA_RUN_COUNT_MASK ) && i < delta_cnt;
- ++j )
- deltas[i++] = FT_GET_SHORT();
- }
- else
- {
- /* runcnt signed bytes from the stack */
- for ( j = 0;
- j <= ( runcnt & GX_DT_DELTA_RUN_COUNT_MASK ) && i < delta_cnt;
- ++j )
- deltas[i++] = FT_GET_CHAR();
- }
-
- if ( j <= ( runcnt & GX_DT_DELTA_RUN_COUNT_MASK ) )
- {
- /* Bad format */
- FT_FREE( deltas );
- return NULL;
- }
- }
-
- return deltas;
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* ft_var_load_avar */
- /* */
- /* <Description> */
- /* Parse the `avar' table if present. It need not be, so we return */
- /* nothing. */
- /* */
- /* <InOut> */
- /* face :: The font face. */
- /* */
- static void
- ft_var_load_avar( TT_Face face )
- {
- FT_Stream stream = FT_FACE_STREAM(face);
- FT_Memory memory = stream->memory;
- GX_Blend blend = face->blend;
- GX_AVarSegment segment;
- FT_Error error = TT_Err_Ok;
- FT_ULong version;
- FT_Long axisCount;
- FT_Int i, j;
- FT_ULong table_len;
-
- FT_UNUSED( error );
-
-
- blend->avar_checked = TRUE;
- if ( (error = face->goto_table( face, TTAG_avar, stream, &table_len )) != 0 )
- return;
-
- if ( FT_FRAME_ENTER( table_len ) )
- return;
-
- version = FT_GET_LONG();
- axisCount = FT_GET_LONG();
-
- if ( version != 0x00010000L ||
- axisCount != (FT_Long)blend->mmvar->num_axis )
- goto Exit;
-
- if ( FT_NEW_ARRAY( blend->avar_segment, axisCount ) )
- goto Exit;
-
- segment = &blend->avar_segment[0];
- for ( i = 0; i < axisCount; ++i, ++segment )
- {
- segment->pairCount = FT_GET_USHORT();
- if ( FT_NEW_ARRAY( segment->correspondence, segment->pairCount ) )
- {
- /* Failure. Free everything we have done so far. We must do */
- /* it right now since loading the `avar' table is optional. */
-
- for ( j = i - 1; j >= 0; --j )
- FT_FREE( blend->avar_segment[j].correspondence );
-
- FT_FREE( blend->avar_segment );
- blend->avar_segment = NULL;
- goto Exit;
- }
-
- for ( j = 0; j < segment->pairCount; ++j )
- {
- segment->correspondence[j].fromCoord =
- FT_GET_SHORT() << 2; /* convert to Fixed */
- segment->correspondence[j].toCoord =
- FT_GET_SHORT()<<2; /* convert to Fixed */
- }
- }
-
- Exit:
- FT_FRAME_EXIT();
- }
-
-
- typedef struct GX_GVar_Head_
- {
- FT_Long version;
- FT_UShort axisCount;
- FT_UShort globalCoordCount;
- FT_ULong offsetToCoord;
- FT_UShort glyphCount;
- FT_UShort flags;
- FT_ULong offsetToData;
-
- } GX_GVar_Head;
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* ft_var_load_gvar */
- /* */
- /* <Description> */
- /* Parses the `gvar' table if present. If `fvar' is there, `gvar' */
- /* had better be there too. */
- /* */
- /* <InOut> */
- /* face :: The font face. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. */
- /* */
- static FT_Error
- ft_var_load_gvar( TT_Face face )
- {
- FT_Stream stream = FT_FACE_STREAM(face);
- FT_Memory memory = stream->memory;
- GX_Blend blend = face->blend;
- FT_Error error;
- FT_UInt i, j;
- FT_ULong table_len;
- FT_ULong gvar_start;
- FT_ULong offsetToData;
- GX_GVar_Head gvar_head;
-
- static const FT_Frame_Field gvar_fields[] =
- {
-
-#undef FT_STRUCTURE
-#define FT_STRUCTURE GX_GVar_Head
-
- FT_FRAME_START( 20 ),
- FT_FRAME_LONG ( version ),
- FT_FRAME_USHORT( axisCount ),
- FT_FRAME_USHORT( globalCoordCount ),
- FT_FRAME_ULONG ( offsetToCoord ),
- FT_FRAME_USHORT( glyphCount ),
- FT_FRAME_USHORT( flags ),
- FT_FRAME_ULONG ( offsetToData ),
- FT_FRAME_END
- };
-
- if ( (error = face->goto_table( face, TTAG_gvar, stream, &table_len )) != 0 )
- goto Exit;
-
- gvar_start = FT_STREAM_POS( );
- if ( FT_STREAM_READ_FIELDS( gvar_fields, &gvar_head ) )
- goto Exit;
-
- blend->tuplecount = gvar_head.globalCoordCount;
- blend->gv_glyphcnt = gvar_head.glyphCount;
- offsetToData = gvar_start + gvar_head.offsetToData;
-
- if ( gvar_head.version != (FT_Long)0x00010000L ||
- gvar_head.axisCount != (FT_UShort)blend->mmvar->num_axis )
- {
- error = TT_Err_Invalid_Table;
- goto Exit;
- }
-
- if ( FT_NEW_ARRAY( blend->glyphoffsets, blend->gv_glyphcnt + 1 ) )
- goto Exit;
-
- if ( gvar_head.flags & 1 )
- {
- /* long offsets (one more offset than glyphs, to mark size of last) */
- if ( FT_FRAME_ENTER( ( blend->gv_glyphcnt + 1 ) * 4L ) )
- goto Exit;
-
- for ( i = 0; i <= blend->gv_glyphcnt; ++i )
- blend->glyphoffsets[i] = offsetToData + FT_GET_LONG();
-
- FT_FRAME_EXIT();
- }
- else
- {
- /* short offsets (one more offset than glyphs, to mark size of last) */
- if ( FT_FRAME_ENTER( ( blend->gv_glyphcnt + 1 ) * 2L ) )
- goto Exit;
-
- for ( i = 0; i <= blend->gv_glyphcnt; ++i )
- blend->glyphoffsets[i] = offsetToData + FT_GET_USHORT() * 2;
- /* XXX: Undocumented: `*2'! */
-
- FT_FRAME_EXIT();
- }
-
- if ( blend->tuplecount != 0 )
- {
- if ( FT_NEW_ARRAY( blend->tuplecoords,
- gvar_head.axisCount * blend->tuplecount ) )
- goto Exit;
-
- if ( FT_STREAM_SEEK( gvar_start + gvar_head.offsetToCoord ) ||
- FT_FRAME_ENTER( blend->tuplecount * gvar_head.axisCount * 2L ) )
- goto Exit;
-
- for ( i = 0; i < blend->tuplecount; ++i )
- for ( j = 0 ; j < (FT_UInt)gvar_head.axisCount; ++j )
- blend->tuplecoords[i * gvar_head.axisCount + j] =
- FT_GET_SHORT() << 2; /* convert to FT_Fixed */
-
- FT_FRAME_EXIT();
- }
-
- Exit:
- return error;
- }
-
-
- /*************************************************************************/
- /* */
- /* <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 */