diff options
Diffstat (limited to 'src/truetype/ttgxvar.c')
| -rw-r--r-- | src/truetype/ttgxvar.c | 1539 |
1 files changed, 0 insertions, 1539 deletions
diff --git a/src/truetype/ttgxvar.c b/src/truetype/ttgxvar.c deleted file mode 100644 index 0b3adbc..0000000 --- a/src/truetype/ttgxvar.c +++ /dev/null @@ -1,1539 +0,0 @@ -/***************************************************************************/ -/* */ -/* ttgxvar.c */ -/* */ -/* TrueType GX Font Variation loader */ -/* */ -/* Copyright 2004, 2005, 2006, 2007, 2008 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_IDS_H -#include FT_TRUETYPE_TAGS_H -#include FT_MULTIPLE_MASTERS_H - -#include "ttdriver.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 ) - - - enum - { - GX_PT_POINTS_ARE_WORDS = 0x80, - 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(); - - /* 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(); - - for ( j = 0; j < runcnt; ++j ) - points[i++] = (FT_UShort)( first += FT_GET_BYTE() ); - } - } - - 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_Int delta_cnt ) - { - FT_Short *deltas; - FT_Int runcnt; - FT_Int i; - FT_Int 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 || - fvar_head.instanceSize != 4 + 4 * fvar_head.axisCount || - 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; - - /* XXX: TODO - check for overflows */ - 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 - { - for ( i = 0; - i < num_coords && blend->normalizedcoords[i] == coords[i]; - ++i ); - if ( i == num_coords ) - manageCvt = mcvt_retain; - else - manageCvt = mcvt_load; - - /* 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(( "no blend specified!\n" )); - - error = TT_Err_Ok; - goto Exit; - } - - if ( face->cvt == NULL ) - { - FT_TRACE2(( "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 */ |