ref: 079a22da037835daf5be2bd9eccf7bc1eaa2e783
dir: /src/truetype/ttgxvar.c/
/**************************************************************************** * * ttgxvar.c * * TrueType GX Font Variation loader * * Copyright (C) 2004-2022 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 * * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6[fgca]var.html * * 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 <freetype/internal/ftdebug.h> #include FT_CONFIG_CONFIG_H #include <freetype/internal/ftstream.h> #include <freetype/internal/sfnt.h> #include <freetype/tttags.h> #include <freetype/ttnameid.h> #include <freetype/ftmm.h> #include <freetype/ftlist.h> #include "ttpload.h" #include "ttgxvar.h" #include "tterrors.h" #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT #define FT_Stream_FTell( stream ) \ (FT_ULong)( (stream)->cursor - (stream)->base ) #define FT_Stream_SeekSet( stream, off ) \ (stream)->cursor = \ ( (off) < (FT_ULong)( (stream)->limit - (stream)->base ) ) \ ? (stream)->base + (off) \ : (stream)->limit /* some macros we need */ #define FT_fdot14ToFixed( x ) \ ( (FT_Fixed)( (FT_ULong)(x) << 2 ) ) #define FT_intToFixed( i ) \ ( (FT_Fixed)( (FT_ULong)(i) << 16 ) ) #define FT_fdot6ToFixed( i ) \ ( (FT_Fixed)( (FT_ULong)(i) << 10 ) ) #define FT_fixedToInt( x ) \ ( (FT_Short)( ( (x) + 0x8000U ) >> 16 ) ) #define FT_fixedToFdot6( x ) \ ( (FT_Pos)( ( (x) + 0x200 ) >> 10 ) ) /************************************************************************** * * 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 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. */ /* ensure that value `0' has the same width as a pointer */ #define ALL_POINTS (FT_UShort*)~(FT_PtrDist)0 #define GX_PT_POINTS_ARE_WORDS 0x80U #define GX_PT_POINT_RUN_COUNT_MASK 0x7FU /************************************************************************** * * @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. * * size :: * The size of the table holding the data. * * @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_ULong size, FT_UInt *point_cnt ) { FT_UShort *points = NULL; FT_UInt n; FT_UInt runcnt; FT_UInt i, j; FT_UShort first; FT_Memory memory = stream->memory; FT_Error error; *point_cnt = 0; n = FT_GET_BYTE(); if ( n == 0 ) return ALL_POINTS; if ( n & GX_PT_POINTS_ARE_WORDS ) { n &= GX_PT_POINT_RUN_COUNT_MASK; n <<= 8; n |= FT_GET_BYTE(); } if ( n > size ) { FT_TRACE1(( "ft_var_readpackedpoints: number of points too large\n" )); return NULL; } /* in the nested loops below we increase `i' twice; */ /* it is faster to simply allocate one more slot */ /* than to add another test within the loop */ if ( FT_QNEW_ARRAY( points, n + 1 ) ) return NULL; *point_cnt = n; first = 0; i = 0; while ( i < n ) { runcnt = FT_GET_BYTE(); if ( runcnt & GX_PT_POINTS_ARE_WORDS ) { runcnt &= GX_PT_POINT_RUN_COUNT_MASK; first += FT_GET_USHORT(); points[i++] = first; /* first point not included in run count */ for ( j = 0; j < runcnt; j++ ) { first += FT_GET_USHORT(); points[i++] = first; if ( i >= n ) break; } } else { first += FT_GET_BYTE(); points[i++] = first; for ( j = 0; j < runcnt; j++ ) { first += FT_GET_BYTE(); points[i++] = first; if ( i >= n ) break; } } } return points; } #define GX_DT_DELTAS_ARE_ZERO 0x80U #define GX_DT_DELTAS_ARE_WORDS 0x40U #define GX_DT_DELTA_RUN_COUNT_MASK 0x3FU /************************************************************************** * * @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. * * size :: * The size of the table holding the data. * * delta_cnt :: * The number of deltas to be read. * * @Return: * An array of FT_Fixed 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.) * * We use FT_Fixed to avoid accumulation errors while summing up all * deltas (the rounding to integer values happens as the very last * step). */ static FT_Fixed* ft_var_readpackeddeltas( FT_Stream stream, FT_ULong size, FT_UInt delta_cnt ) { FT_Fixed *deltas = NULL; FT_UInt runcnt, cnt; FT_UInt i, j; FT_UInt bytes_used; FT_Memory memory = stream->memory; FT_Error error; if ( FT_QNEW_ARRAY( deltas, delta_cnt ) ) return NULL; i = 0; bytes_used = 0; while ( i < delta_cnt && bytes_used < size ) { runcnt = FT_GET_BYTE(); cnt = runcnt & GX_DT_DELTA_RUN_COUNT_MASK; bytes_used++; if ( runcnt & GX_DT_DELTAS_ARE_ZERO ) { /* `cnt` + 1 zeroes get added */ for ( j = 0; j <= cnt && i < delta_cnt; j++ ) deltas[i++] = 0; } else if ( runcnt & GX_DT_DELTAS_ARE_WORDS ) { /* `cnt` + 1 shorts from the stack */ bytes_used += 2 * ( cnt + 1 ); if ( bytes_used > size ) { FT_TRACE1(( "ft_var_readpackeddeltas:" " number of short deltas too large\n" )); goto Fail; } for ( j = 0; j <= cnt && i < delta_cnt; j++ ) deltas[i++] = FT_intToFixed( FT_GET_SHORT() ); } else { /* `cnt` + 1 signed bytes from the stack */ bytes_used += cnt + 1; if ( bytes_used > size ) { FT_TRACE1(( "ft_var_readpackeddeltas:" " number of byte deltas too large\n" )); goto Fail; } for ( j = 0; j <= cnt && i < delta_cnt; j++ ) deltas[i++] = FT_intToFixed( FT_GET_CHAR() ); } if ( j <= cnt ) { FT_TRACE1(( "ft_var_readpackeddeltas:" " number of deltas too large\n" )); goto Fail; } } if ( i < delta_cnt ) { FT_TRACE1(( "ft_var_readpackeddeltas: not enough deltas\n" )); goto Fail; } return deltas; Fail: FT_FREE( deltas ); return NULL; } /************************************************************************** * * @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; FT_Long version; FT_Long axisCount; FT_Int i, j; FT_ULong table_len; FT_TRACE2(( "AVAR " )); blend->avar_loaded = TRUE; error = face->goto_table( face, TTAG_avar, stream, &table_len ); if ( error ) { FT_TRACE2(( "is missing\n" )); return; } if ( FT_FRAME_ENTER( table_len ) ) return; version = FT_GET_LONG(); axisCount = FT_GET_LONG(); if ( version != 0x00010000L ) { FT_TRACE2(( "bad table version\n" )); goto Exit; } FT_TRACE2(( "loaded\n" )); if ( axisCount != (FT_Long)blend->mmvar->num_axis ) { FT_TRACE2(( "ft_var_load_avar:" " number of axes in `avar' and `fvar'\n" )); FT_TRACE2(( " table are different\n" )); goto Exit; } if ( FT_QNEW_ARRAY( blend->avar_segment, axisCount ) ) goto Exit; segment = &blend->avar_segment[0]; for ( i = 0; i < axisCount; i++, segment++ ) { FT_TRACE5(( " axis %d:\n", i )); segment->pairCount = FT_GET_USHORT(); if ( (FT_ULong)segment->pairCount * 4 > table_len || FT_QNEW_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 ); goto Exit; } for ( j = 0; j < segment->pairCount; j++ ) { segment->correspondence[j].fromCoord = FT_fdot14ToFixed( FT_GET_SHORT() ); segment->correspondence[j].toCoord = FT_fdot14ToFixed( FT_GET_SHORT() ); FT_TRACE5(( " mapping %.5f to %.5f\n", segment->correspondence[j].fromCoord / 65536.0, segment->correspondence[j].toCoord / 65536.0 )); } FT_TRACE5(( "\n" )); } Exit: FT_FRAME_EXIT(); } static FT_Error ft_var_load_item_variation_store( TT_Face face, FT_ULong offset, GX_ItemVarStore itemStore ) { FT_Stream stream = FT_FACE_STREAM( face ); FT_Memory memory = stream->memory; FT_Error error; FT_UShort format; FT_ULong region_offset; FT_UInt i, j, k; FT_UInt wordDeltaCount; FT_Bool long_words; GX_Blend blend = face->blend; GX_ItemVarData varData; FT_ULong* dataOffsetArray = NULL; if ( FT_STREAM_SEEK( offset ) || FT_READ_USHORT( format ) ) goto Exit; if ( format != 1 ) { FT_TRACE2(( "ft_var_load_item_variation_store: bad store format %d\n", format )); error = FT_THROW( Invalid_Table ); goto Exit; } /* read top level fields */ if ( FT_READ_ULONG( region_offset ) || FT_READ_USHORT( itemStore->dataCount ) ) goto Exit; /* we need at least one entry in `itemStore->varData' */ if ( !itemStore->dataCount ) { FT_TRACE2(( "ft_var_load_item_variation_store: missing varData\n" )); error = FT_THROW( Invalid_Table ); goto Exit; } /* make temporary copy of item variation data offsets; */ /* we will parse region list first, then come back */ if ( FT_QNEW_ARRAY( dataOffsetArray, itemStore->dataCount ) ) goto Exit; for ( i = 0; i < itemStore->dataCount; i++ ) { if ( FT_READ_ULONG( dataOffsetArray[i] ) ) goto Exit; } /* parse array of region records (region list) */ if ( FT_STREAM_SEEK( offset + region_offset ) ) goto Exit; if ( FT_READ_USHORT( itemStore->axisCount ) || FT_READ_USHORT( itemStore->regionCount ) ) goto Exit; if ( itemStore->axisCount != (FT_Long)blend->mmvar->num_axis ) { FT_TRACE2(( "ft_var_load_item_variation_store:" " number of axes in item variation store\n" )); FT_TRACE2(( " " " and `fvar' table are different\n" )); error = FT_THROW( Invalid_Table ); goto Exit; } /* new constraint in OpenType 1.8.4 */ if ( itemStore->regionCount >= 32768U ) { FT_TRACE2(( "ft_var_load_item_variation_store:" " too many variation region tables\n" )); error = FT_THROW( Invalid_Table ); goto Exit; } if ( FT_NEW_ARRAY( itemStore->varRegionList, itemStore->regionCount ) ) goto Exit; for ( i = 0; i < itemStore->regionCount; i++ ) { GX_AxisCoords axisCoords; if ( FT_NEW_ARRAY( itemStore->varRegionList[i].axisList, itemStore->axisCount ) ) goto Exit; axisCoords = itemStore->varRegionList[i].axisList; for ( j = 0; j < itemStore->axisCount; j++ ) { FT_Short start, peak, end; if ( FT_READ_SHORT( start ) || FT_READ_SHORT( peak ) || FT_READ_SHORT( end ) ) goto Exit; axisCoords[j].startCoord = FT_fdot14ToFixed( start ); axisCoords[j].peakCoord = FT_fdot14ToFixed( peak ); axisCoords[j].endCoord = FT_fdot14ToFixed( end ); } } /* end of region list parse */ /* use dataOffsetArray now to parse varData items */ if ( FT_NEW_ARRAY( itemStore->varData, itemStore->dataCount ) ) goto Exit; for ( i = 0; i < itemStore->dataCount; i++ ) { varData = &itemStore->varData[i]; if ( FT_STREAM_SEEK( offset + dataOffsetArray[i] ) ) goto Exit; if ( FT_READ_USHORT( varData->itemCount ) || FT_READ_USHORT( wordDeltaCount ) || FT_READ_USHORT( varData->regionIdxCount ) ) goto Exit; long_words = !!( wordDeltaCount & 0x8000 ); wordDeltaCount &= 0x7FFF; /* check some data consistency */ if ( wordDeltaCount > varData->regionIdxCount ) { FT_TRACE2(( "bad short count %d or region count %d\n", wordDeltaCount, varData->regionIdxCount )); error = FT_THROW( Invalid_Table ); goto Exit; } if ( varData->regionIdxCount > itemStore->regionCount ) { FT_TRACE2(( "inconsistent regionCount %d in varData[%d]\n", varData->regionIdxCount, i )); error = FT_THROW( Invalid_Table ); goto Exit; } /* parse region indices */ if ( FT_NEW_ARRAY( varData->regionIndices, varData->regionIdxCount ) ) goto Exit; for ( j = 0; j < varData->regionIdxCount; j++ ) { if ( FT_READ_USHORT( varData->regionIndices[j] ) ) goto Exit; if ( varData->regionIndices[j] >= itemStore->regionCount ) { FT_TRACE2(( "bad region index %d\n", varData->regionIndices[j] )); error = FT_THROW( Invalid_Table ); goto Exit; } } /* Parse delta set. */ /* */ /* On input, deltas are (wordDeltaCount + regionIdxCount) bytes */ /* each if `long_words` isn't set, and twice as much otherwise. */ /* */ /* On output, deltas are expanded to `regionIdxCount` shorts each. */ if ( FT_NEW_ARRAY( varData->deltaSet, varData->regionIdxCount * varData->itemCount ) ) goto Exit; /* the delta set is stored as a 2-dimensional array of shorts */ if ( long_words ) { /* new in OpenType 1.9, currently for 'COLR' table only; */ /* the deltas are interpreted as 16.16 fixed-point scaling values */ /* not supported yet */ error = FT_THROW( Invalid_Table ); goto Exit; } else { for ( j = 0; j < varData->itemCount * varData->regionIdxCount; ) { for ( k = 0; k < wordDeltaCount; k++, j++ ) { /* read the short deltas */ FT_Short delta; if ( FT_READ_SHORT( delta ) ) goto Exit; varData->deltaSet[j] = delta; } for ( ; k < varData->regionIdxCount; k++, j++ ) { /* read the (signed) byte deltas */ FT_Char delta; if ( FT_READ_CHAR( delta ) ) goto Exit; varData->deltaSet[j] = delta; } } } } Exit: FT_FREE( dataOffsetArray ); return error; } static FT_Error ft_var_load_delta_set_index_mapping( TT_Face face, FT_ULong offset, GX_DeltaSetIdxMap map, GX_ItemVarStore itemStore, FT_ULong table_len ) { FT_Stream stream = FT_FACE_STREAM( face ); FT_Memory memory = stream->memory; FT_Error error; FT_Byte format; FT_Byte entryFormat; FT_UInt entrySize; FT_UInt innerBitCount; FT_UInt innerIndexMask; FT_ULong i; FT_UInt j; if ( FT_STREAM_SEEK( offset ) || FT_READ_BYTE( format ) || FT_READ_BYTE( entryFormat ) ) goto Exit; if ( format == 0 ) { if ( FT_READ_USHORT( map->mapCount ) ) goto Exit; } else if ( format == 1 ) /* new in OpenType 1.9 */ { if ( FT_READ_ULONG( map->mapCount ) ) goto Exit; } else { FT_TRACE2(( "bad map format %d\n", format )); error = FT_THROW( Invalid_Table ); goto Exit; } if ( entryFormat & 0xC0 ) { FT_TRACE2(( "bad entry format %d\n", format )); error = FT_THROW( Invalid_Table ); goto Exit; } /* bytes per entry: 1, 2, 3, or 4 */ entrySize = ( ( entryFormat & 0x30 ) >> 4 ) + 1; innerBitCount = ( entryFormat & 0x0F ) + 1; innerIndexMask = ( 1 << innerBitCount ) - 1; /* rough sanity check */ if ( map->mapCount * entrySize > table_len ) { FT_TRACE1(( "ft_var_load_delta_set_index_mapping:" " invalid number of delta-set index mappings\n" )); error = FT_THROW( Invalid_Table ); goto Exit; } if ( FT_NEW_ARRAY( map->innerIndex, map->mapCount ) ) goto Exit; if ( FT_NEW_ARRAY( map->outerIndex, map->mapCount ) ) goto Exit; for ( i = 0; i < map->mapCount; i++ ) { FT_UInt mapData = 0; FT_UInt outerIndex, innerIndex; /* read map data one unsigned byte at a time, big endian */ for ( j = 0; j < entrySize; j++ ) { FT_Byte data; if ( FT_READ_BYTE( data ) ) goto Exit; mapData = ( mapData << 8 ) | data; } outerIndex = mapData >> innerBitCount; if ( outerIndex >= itemStore->dataCount ) { FT_TRACE2(( "outerIndex[%ld] == %d out of range\n", i, outerIndex )); error = FT_THROW( Invalid_Table ); goto Exit; } map->outerIndex[i] = outerIndex; innerIndex = mapData & innerIndexMask; if ( innerIndex >= itemStore->varData[outerIndex].itemCount ) { FT_TRACE2(( "innerIndex[%ld] == %d out of range\n", i, innerIndex )); error = FT_THROW( Invalid_Table ); goto Exit; } map->innerIndex[i] = innerIndex; } Exit: return error; } /************************************************************************** * * @Function: * ft_var_load_hvvar * * @Description: * If `vertical' is zero, parse the `HVAR' table and set * `blend->hvar_loaded' to TRUE. On success, `blend->hvar_checked' * is set to TRUE. * * If `vertical' is not zero, parse the `VVAR' table and set * `blend->vvar_loaded' to TRUE. On success, `blend->vvar_checked' * is set to TRUE. * * Some memory may remain allocated on error; it is always freed in * `tt_done_blend', however. * * @InOut: * face :: * The font face. * * @Return: * FreeType error code. 0 means success. */ static FT_Error ft_var_load_hvvar( TT_Face face, FT_Bool vertical ) { FT_Stream stream = FT_FACE_STREAM( face ); FT_Memory memory = stream->memory; GX_Blend blend = face->blend; GX_HVVarTable table; FT_Error error; FT_UShort majorVersion; FT_ULong table_len; FT_ULong table_offset; FT_ULong store_offset; FT_ULong widthMap_offset; if ( vertical ) { blend->vvar_loaded = TRUE; FT_TRACE2(( "VVAR " )); error = face->goto_table( face, TTAG_VVAR, stream, &table_len ); } else { blend->hvar_loaded = TRUE; FT_TRACE2(( "HVAR " )); error = face->goto_table( face, TTAG_HVAR, stream, &table_len ); } if ( error ) { FT_TRACE2(( "is missing\n" )); goto Exit; } table_offset = FT_STREAM_POS(); /* skip minor version */ if ( FT_READ_USHORT( majorVersion ) || FT_STREAM_SKIP( 2 ) ) goto Exit; if ( majorVersion != 1 ) { FT_TRACE2(( "bad table version %d\n", majorVersion )); error = FT_THROW( Invalid_Table ); goto Exit; } if ( FT_READ_ULONG( store_offset ) || FT_READ_ULONG( widthMap_offset ) ) goto Exit; if ( vertical ) { if ( FT_NEW( blend->vvar_table ) ) goto Exit; table = blend->vvar_table; } else { if ( FT_NEW( blend->hvar_table ) ) goto Exit; table = blend->hvar_table; } error = ft_var_load_item_variation_store( face, table_offset + store_offset, &table->itemStore ); if ( error ) goto Exit; if ( widthMap_offset ) { error = ft_var_load_delta_set_index_mapping( face, table_offset + widthMap_offset, &table->widthMap, &table->itemStore, table_len ); if ( error ) goto Exit; } FT_TRACE2(( "loaded\n" )); error = FT_Err_Ok; Exit: if ( !error ) { if ( vertical ) { blend->vvar_checked = TRUE; /* FreeType doesn't provide functions to quickly retrieve */ /* TSB, BSB, or VORG values; we thus don't have to implement */ /* support for those three item variation stores. */ face->variation_support |= TT_FACE_FLAG_VAR_VADVANCE; } else { blend->hvar_checked = TRUE; /* FreeType doesn't provide functions to quickly retrieve */ /* LSB or RSB values; we thus don't have to implement */ /* support for those two item variation stores. */ face->variation_support |= TT_FACE_FLAG_VAR_HADVANCE; } } return error; } static FT_Int ft_var_get_item_delta( TT_Face face, GX_ItemVarStore itemStore, FT_UInt outerIndex, FT_UInt innerIndex ) { GX_ItemVarData varData; FT_Short* deltaSet; FT_UInt master, j; FT_Fixed netAdjustment = 0; /* accumulated adjustment */ FT_Fixed scaledDelta; FT_Fixed delta; /* See pseudo code from `Font Variations Overview' */ /* in the OpenType specification. */ varData = &itemStore->varData[outerIndex]; deltaSet = &varData->deltaSet[varData->regionIdxCount * innerIndex]; /* outer loop steps through master designs to be blended */ for ( master = 0; master < varData->regionIdxCount; master++ ) { FT_Fixed scalar = 0x10000L; FT_UInt regionIndex = varData->regionIndices[master]; GX_AxisCoords axis = itemStore->varRegionList[regionIndex].axisList; /* inner loop steps through axes in this region */ for ( j = 0; j < itemStore->axisCount; j++, axis++ ) { /* compute the scalar contribution of this axis; */ /* ignore invalid ranges */ if ( axis->startCoord > axis->peakCoord || axis->peakCoord > axis->endCoord ) continue; else if ( axis->startCoord < 0 && axis->endCoord > 0 && axis->peakCoord != 0 ) continue; /* peak of 0 means ignore this axis */ else if ( axis->peakCoord == 0 ) continue; else if ( face->blend->normalizedcoords[j] == axis->peakCoord ) continue; /* ignore this region if coords are out of range */ else if ( face->blend->normalizedcoords[j] <= axis->startCoord || face->blend->normalizedcoords[j] >= axis->endCoord ) { scalar = 0; break; } /* cumulative product of all the axis scalars */ else if ( face->blend->normalizedcoords[j] < axis->peakCoord ) scalar = FT_MulDiv( scalar, face->blend->normalizedcoords[j] - axis->startCoord, axis->peakCoord - axis->startCoord ); else scalar = FT_MulDiv( scalar, axis->endCoord - face->blend->normalizedcoords[j], axis->endCoord - axis->peakCoord ); } /* per-axis loop */ /* get the scaled delta for this region */ delta = FT_intToFixed( deltaSet[master] ); scaledDelta = FT_MulFix( scalar, delta ); /* accumulate the adjustments from each region */ netAdjustment = netAdjustment + scaledDelta; } /* per-region loop */ return FT_fixedToInt( netAdjustment ); } /************************************************************************** * * @Function: * tt_hvadvance_adjust * * @Description: * Apply `HVAR' advance width or `VVAR' advance height adjustment of * a given glyph. * * @Input: * gindex :: * The glyph index. * * vertical :: * If set, handle `VVAR' table. * * @InOut: * face :: * The font face. * * adelta :: * Points to width or height value that gets modified. */ static FT_Error tt_hvadvance_adjust( TT_Face face, FT_UInt gindex, FT_Int *avalue, FT_Bool vertical ) { FT_Error error = FT_Err_Ok; FT_UInt innerIndex, outerIndex; FT_Int delta; GX_HVVarTable table; if ( !face->doblend || !face->blend ) goto Exit; if ( vertical ) { if ( !face->blend->vvar_loaded ) { /* initialize vvar table */ face->blend->vvar_error = ft_var_load_hvvar( face, 1 ); } if ( !face->blend->vvar_checked ) { error = face->blend->vvar_error; goto Exit; } table = face->blend->vvar_table; } else { if ( !face->blend->hvar_loaded ) { /* initialize hvar table */ face->blend->hvar_error = ft_var_load_hvvar( face, 0 ); } if ( !face->blend->hvar_checked ) { error = face->blend->hvar_error; goto Exit; } table = face->blend->hvar_table; } /* advance width or height adjustments are always present in an */ /* `HVAR' or `VVAR' table; no need to test for this capability */ if ( table->widthMap.innerIndex ) { FT_UInt idx = gindex; if ( idx >= table->widthMap.mapCount ) idx = table->widthMap.mapCount - 1; /* trust that HVAR parser has checked indices */ outerIndex = table->widthMap.outerIndex[idx]; innerIndex = table->widthMap.innerIndex[idx]; } else { GX_ItemVarData varData; /* no widthMap data */ outerIndex = 0; innerIndex = gindex; varData = &table->itemStore.varData[outerIndex]; if ( gindex >= varData->itemCount ) { FT_TRACE2(( "gindex %d out of range\n", gindex )); error = FT_THROW( Invalid_Argument ); goto Exit; } } delta = ft_var_get_item_delta( face, &table->itemStore, outerIndex, innerIndex ); FT_TRACE5(( "%s value %d adjusted by %d unit%s (%s)\n", vertical ? "vertical height" : "horizontal width", *avalue, delta, delta == 1 ? "" : "s", vertical ? "VVAR" : "HVAR" )); *avalue += delta; Exit: return error; } FT_LOCAL_DEF( FT_Error ) tt_hadvance_adjust( TT_Face face, FT_UInt gindex, FT_Int *avalue ) { return tt_hvadvance_adjust( face, gindex, avalue, 0 ); } FT_LOCAL_DEF( FT_Error ) tt_vadvance_adjust( TT_Face face, FT_UInt gindex, FT_Int *avalue ) { return tt_hvadvance_adjust( face, gindex, avalue, 1 ); } #define GX_VALUE_SIZE 8 /* all values are FT_Short or FT_UShort entities; */ /* we treat them consistently as FT_Short */ #define GX_VALUE_CASE( tag, dflt ) \ case MVAR_TAG_ ## tag : \ p = (FT_Short*)&face->dflt; \ break #define GX_GASP_CASE( idx ) \ case MVAR_TAG_GASP_ ## idx : \ if ( idx < face->gasp.numRanges - 1 ) \ p = (FT_Short*)&face->gasp.gaspRanges[idx].maxPPEM; \ else \ p = NULL; \ break static FT_Short* ft_var_get_value_pointer( TT_Face face, FT_ULong mvar_tag ) { FT_Short* p; switch ( mvar_tag ) { GX_GASP_CASE( 0 ); GX_GASP_CASE( 1 ); GX_GASP_CASE( 2 ); GX_GASP_CASE( 3 ); GX_GASP_CASE( 4 ); GX_GASP_CASE( 5 ); GX_GASP_CASE( 6 ); GX_GASP_CASE( 7 ); GX_GASP_CASE( 8 ); GX_GASP_CASE( 9 ); GX_VALUE_CASE( CPHT, os2.sCapHeight ); GX_VALUE_CASE( HASC, os2.sTypoAscender ); GX_VALUE_CASE( HCLA, os2.usWinAscent ); GX_VALUE_CASE( HCLD, os2.usWinDescent ); GX_VALUE_CASE( HCOF, horizontal.caret_Offset ); GX_VALUE_CASE( HCRN, horizontal.caret_Slope_Run ); GX_VALUE_CASE( HCRS, horizontal.caret_Slope_Rise ); GX_VALUE_CASE( HDSC, os2.sTypoDescender ); GX_VALUE_CASE( HLGP, os2.sTypoLineGap ); GX_VALUE_CASE( SBXO, os2.ySubscriptXOffset); GX_VALUE_CASE( SBXS, os2.ySubscriptXSize ); GX_VALUE_CASE( SBYO, os2.ySubscriptYOffset ); GX_VALUE_CASE( SBYS, os2.ySubscriptYSize ); GX_VALUE_CASE( SPXO, os2.ySuperscriptXOffset ); GX_VALUE_CASE( SPXS, os2.ySuperscriptXSize ); GX_VALUE_CASE( SPYO, os2.ySuperscriptYOffset ); GX_VALUE_CASE( SPYS, os2.ySuperscriptYSize ); GX_VALUE_CASE( STRO, os2.yStrikeoutPosition ); GX_VALUE_CASE( STRS, os2.yStrikeoutSize ); GX_VALUE_CASE( UNDO, postscript.underlinePosition ); GX_VALUE_CASE( UNDS, postscript.underlineThickness ); GX_VALUE_CASE( VASC, vertical.Ascender ); GX_VALUE_CASE( VCOF, vertical.caret_Offset ); GX_VALUE_CASE( VCRN, vertical.caret_Slope_Run ); GX_VALUE_CASE( VCRS, vertical.caret_Slope_Rise ); GX_VALUE_CASE( VDSC, vertical.Descender ); GX_VALUE_CASE( VLGP, vertical.Line_Gap ); GX_VALUE_CASE( XHGT, os2.sxHeight ); default: /* ignore unknown tag */ p = NULL; } return p; } /************************************************************************** * * @Function: * ft_var_load_mvar * * @Description: * Parse the `MVAR' table. * * Some memory may remain allocated on error; it is always freed in * `tt_done_blend', however. * * @InOut: * face :: * The font face. */ static void ft_var_load_mvar( TT_Face face ) { FT_Stream stream = FT_FACE_STREAM( face ); FT_Memory memory = stream->memory; GX_Blend blend = face->blend; GX_ItemVarStore itemStore; GX_Value value, limit; FT_Error error; FT_UShort majorVersion; FT_ULong table_len; FT_ULong table_offset; FT_UShort store_offset; FT_ULong records_offset; FT_TRACE2(( "MVAR " )); error = face->goto_table( face, TTAG_MVAR, stream, &table_len ); if ( error ) { FT_TRACE2(( "is missing\n" )); return; } table_offset = FT_STREAM_POS(); /* skip minor version */ if ( FT_READ_USHORT( majorVersion ) || FT_STREAM_SKIP( 2 ) ) return; if ( majorVersion != 1 ) { FT_TRACE2(( "bad table version %d\n", majorVersion )); return; } if ( FT_NEW( blend->mvar_table ) ) return; /* skip reserved entry and value record size */ if ( FT_STREAM_SKIP( 4 ) || FT_READ_USHORT( blend->mvar_table->valueCount ) || FT_READ_USHORT( store_offset ) ) return; records_offset = FT_STREAM_POS(); error = ft_var_load_item_variation_store( face, table_offset + store_offset, &blend->mvar_table->itemStore ); if ( error ) return; if ( FT_NEW_ARRAY( blend->mvar_table->values, blend->mvar_table->valueCount ) ) return; if ( FT_STREAM_SEEK( records_offset ) || FT_FRAME_ENTER( blend->mvar_table->valueCount * GX_VALUE_SIZE ) ) return; value = blend->mvar_table->values; limit = value + blend->mvar_table->valueCount; itemStore = &blend->mvar_table->itemStore; for ( ; value < limit; value++ ) { value->tag = FT_GET_ULONG(); value->outerIndex = FT_GET_USHORT(); value->innerIndex = FT_GET_USHORT(); if ( value->outerIndex >= itemStore->dataCount || value->innerIndex >= itemStore->varData[value->outerIndex] .itemCount ) { error = FT_THROW( Invalid_Table ); break; } } FT_FRAME_EXIT(); if ( error ) return; FT_TRACE2(( "loaded\n" )); value = blend->mvar_table->values; limit = value + blend->mvar_table->valueCount; /* save original values of the data MVAR is going to modify */ for ( ; value < limit; value++ ) { FT_Short* p = ft_var_get_value_pointer( face, value->tag ); if ( p ) value->unmodified = *p; #ifdef FT_DEBUG_LEVEL_TRACE else FT_TRACE1(( "ft_var_load_mvar: Ignoring unknown tag `%c%c%c%c'\n", (FT_Char)( value->tag >> 24 ), (FT_Char)( value->tag >> 16 ), (FT_Char)( value->tag >> 8 ), (FT_Char)( value->tag ) )); #endif } face->variation_support |= TT_FACE_FLAG_VAR_MVAR; } static FT_Error tt_size_reset_iterator( FT_ListNode node, void* user ) { TT_Size size = (TT_Size)node->data; FT_UNUSED( user ); tt_size_reset( size, 1 ); return FT_Err_Ok; } /************************************************************************** * * @Function: * tt_apply_mvar * * @Description: * Apply `MVAR' table adjustments. * * @InOut: * face :: * The font face. */ FT_LOCAL_DEF( void ) tt_apply_mvar( TT_Face face ) { GX_Blend blend = face->blend; GX_Value value, limit; FT_Short mvar_hasc_delta = 0; FT_Short mvar_hdsc_delta = 0; FT_Short mvar_hlgp_delta = 0; if ( !( face->variation_support & TT_FACE_FLAG_VAR_MVAR ) ) return; value = blend->mvar_table->values; limit = value + blend->mvar_table->valueCount; for ( ; value < limit; value++ ) { FT_Short* p = ft_var_get_value_pointer( face, value->tag ); FT_Int delta; delta = ft_var_get_item_delta( face, &blend->mvar_table->itemStore, value->outerIndex, value->innerIndex ); if ( p ) { FT_TRACE5(( "value %c%c%c%c (%d unit%s) adjusted by %d unit%s (MVAR)\n", (FT_Char)( value->tag >> 24 ), (FT_Char)( value->tag >> 16 ), (FT_Char)( value->tag >> 8 ), (FT_Char)( value->tag ), value->unmodified, value->unmodified == 1 ? "" : "s", delta, delta == 1 ? "" : "s" )); /* since we handle both signed and unsigned values as FT_Short, */ /* ensure proper overflow arithmetic */ *p = (FT_Short)( value->unmodified + (FT_Short)delta ); /* Treat hasc, hdsc and hlgp specially, see below. */ if ( value->tag == MVAR_TAG_HASC ) mvar_hasc_delta = (FT_Short)delta; else if ( value->tag == MVAR_TAG_HDSC ) mvar_hdsc_delta = (FT_Short)delta; else if ( value->tag == MVAR_TAG_HLGP ) mvar_hlgp_delta = (FT_Short)delta; } } /* adjust all derived values */ { FT_Face root = &face->root; /* * Apply the deltas of hasc, hdsc and hlgp to the FT_Face's ascender, * descender and height attributes, no matter how they were originally * computed. * * (Code that ignores those and accesses the font's metrics values * directly is already served by the delta application code above.) * * The MVAR table supports variations for both typo and win metrics. * According to Behdad Esfahbod, the thinking of the working group was * that no one uses win metrics anymore for setting line metrics (the * specification even calls these metrics "horizontal clipping * ascent/descent", probably for their role on the Windows platform in * computing clipping boxes), and new fonts should use typo metrics, so * typo deltas should be applied to whatever sfnt_load_face decided the * line metrics should be. * * Before, the following led to different line metrics between default * outline and instances, visible when e.g. the default outlines were * used as the regular face and instances for everything else: * * 1. sfnt_load_face applied the hhea metrics by default. * 2. This code later applied the typo metrics by default, regardless of * whether they were actually changed or the font had the OS/2 table's * fsSelection's bit 7 (USE_TYPO_METRICS) set. */ FT_Short current_line_gap = root->height - root->ascender + root->descender; root->ascender = root->ascender + mvar_hasc_delta; root->descender = root->descender + mvar_hdsc_delta; root->height = root->ascender - root->descender + current_line_gap + mvar_hlgp_delta; root->underline_position = face->postscript.underlinePosition - face->postscript.underlineThickness / 2; root->underline_thickness = face->postscript.underlineThickness; /* iterate over all FT_Size objects and call `tt_size_reset' */ /* to propagate the metrics changes */ FT_List_Iterate( &root->sizes_list, tt_size_reset_iterator, NULL ); } } 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: * Parse 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; FT_ULong offsets_len; 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 }; FT_TRACE2(( "GVAR " )); if ( FT_SET_ERROR( face->goto_table( face, TTAG_gvar, stream, &table_len ) ) ) { FT_TRACE2(( "is missing\n" )); goto Exit; } gvar_start = FT_STREAM_POS( ); if ( FT_STREAM_READ_FIELDS( gvar_fields, &gvar_head ) ) goto Exit; if ( gvar_head.version != 0x00010000L ) { FT_TRACE1(( "bad table version\n" )); error = FT_THROW( Invalid_Table ); goto Exit; } if ( gvar_head.axisCount != (FT_UShort)blend->mmvar->num_axis ) { FT_TRACE1(( "ft_var_load_gvar:" " number of axes in `gvar' and `cvar'\n" )); FT_TRACE1(( " table are different\n" )); error = FT_THROW( Invalid_Table ); goto Exit; } /* rough sanity check, ignoring offsets */ if ( (FT_ULong)gvar_head.globalCoordCount * gvar_head.axisCount > table_len / 2 ) { FT_TRACE1(( "ft_var_load_gvar:" " invalid number of global coordinates\n" )); error = FT_THROW( Invalid_Table ); goto Exit; } /* offsets can be either 2 or 4 bytes */ /* (one more offset than glyphs, to mark size of last) */ offsets_len = ( gvar_head.glyphCount + 1 ) * ( ( gvar_head.flags & 1 ) ? 4L : 2L ); /* rough sanity check */ if (offsets_len > table_len ) { FT_TRACE1(( "ft_var_load_gvar: invalid number of glyphs\n" )); error = FT_THROW( Invalid_Table ); goto Exit; } FT_TRACE2(( "loaded\n" )); blend->gvar_size = table_len; offsetToData = gvar_start + gvar_head.offsetToData; FT_TRACE5(( "gvar: there %s %d shared coordinate%s:\n", gvar_head.globalCoordCount == 1 ? "is" : "are", gvar_head.globalCoordCount, gvar_head.globalCoordCount == 1 ? "" : "s" )); if ( FT_FRAME_ENTER( offsets_len ) ) goto Exit; /* offsets (one more offset than glyphs, to mark size of last) */ if ( FT_QNEW_ARRAY( blend->glyphoffsets, gvar_head.glyphCount + 1 ) ) goto Fail2; if ( gvar_head.flags & 1 ) { FT_ULong limit = gvar_start + table_len; FT_ULong max_offset = 0; for ( i = 0; i <= gvar_head.glyphCount; i++ ) { blend->glyphoffsets[i] = offsetToData + FT_GET_ULONG(); if ( max_offset <= blend->glyphoffsets[i] ) max_offset = blend->glyphoffsets[i]; else { FT_TRACE2(( "ft_var_load_gvar:" " glyph variation data offset %d not monotonic\n", i )); blend->glyphoffsets[i] = max_offset; } /* use `<', not `<=' */ if ( limit < blend->glyphoffsets[i] ) { FT_TRACE2(( "ft_var_load_gvar:" " glyph variation data offset %d out of range\n", i )); blend->glyphoffsets[i] = limit; } } } else { FT_ULong limit = gvar_start + table_len; FT_ULong max_offset = 0; for ( i = 0; i <= gvar_head.glyphCount; i++ ) { blend->glyphoffsets[i] = offsetToData + FT_GET_USHORT() * 2; if ( max_offset <= blend->glyphoffsets[i] ) max_offset = blend->glyphoffsets[i]; else { FT_TRACE2(( "ft_var_load_gvar:" " glyph variation data offset %d not monotonic\n", i )); blend->glyphoffsets[i] = max_offset; } /* use `<', not `<=' */ if ( limit < blend->glyphoffsets[i] ) { FT_TRACE2(( "ft_var_load_gvar:" " glyph variation data offset %d out of range\n", i )); blend->glyphoffsets[i] = limit; } } } blend->gv_glyphcnt = gvar_head.glyphCount; FT_FRAME_EXIT(); if ( gvar_head.globalCoordCount != 0 ) { if ( FT_STREAM_SEEK( gvar_start + gvar_head.offsetToCoord ) || FT_FRAME_ENTER( gvar_head.globalCoordCount * gvar_head.axisCount * 2L ) ) { FT_TRACE2(( "ft_var_load_gvar:" " glyph variation shared tuples missing\n" )); goto Fail; } if ( FT_QNEW_ARRAY( blend->tuplecoords, gvar_head.axisCount * gvar_head.globalCoordCount ) ) goto Fail2; for ( i = 0; i < gvar_head.globalCoordCount; i++ ) { FT_TRACE5(( " [ " )); for ( j = 0; j < (FT_UInt)gvar_head.axisCount; j++ ) { blend->tuplecoords[i * gvar_head.axisCount + j] = FT_fdot14ToFixed( FT_GET_SHORT() ); FT_TRACE5(( "%.5f ", blend->tuplecoords[i * gvar_head.axisCount + j] / 65536.0 )); } FT_TRACE5(( "]\n" )); } blend->tuplecount = gvar_head.globalCoordCount; FT_TRACE5(( "\n" )); FT_FRAME_EXIT(); } Exit: return error; Fail2: FT_FRAME_EXIT(); Fail: FT_FREE( blend->glyphoffsets ); blend->gv_glyphcnt = 0; goto Exit; } /************************************************************************** * * @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 = 0x10000L; for ( i = 0; i < blend->num_axis; i++ ) { FT_TRACE6(( " axis %d coordinate %.5f:\n", i, blend->normalizedcoords[i] / 65536.0 )); /* 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. */ if ( tuple_coords[i] == 0 ) { FT_TRACE6(( " tuple coordinate is zero, ignore\n" )); continue; } if ( blend->normalizedcoords[i] == 0 ) { FT_TRACE6(( " axis coordinate is zero, stop\n" )); apply = 0; break; } if ( blend->normalizedcoords[i] == tuple_coords[i] ) { FT_TRACE6(( " tuple coordinate %.5f fits perfectly\n", tuple_coords[i] / 65536.0 )); /* `apply' does not change */ continue; } if ( !( tupleIndex & GX_TI_INTERMEDIATE_TUPLE ) ) { /* not an intermediate tuple */ if ( blend->normalizedcoords[i] < FT_MIN( 0, tuple_coords[i] ) || blend->normalizedcoords[i] > FT_MAX( 0, tuple_coords[i] ) ) { FT_TRACE6(( " tuple coordinate %.5f is exceeded, stop\n", tuple_coords[i] / 65536.0 )); apply = 0; break; } FT_TRACE6(( " tuple coordinate %.5f fits\n", tuple_coords[i] / 65536.0 )); apply = FT_MulDiv( apply, blend->normalizedcoords[i], tuple_coords[i] ); } else { /* intermediate tuple */ if ( blend->normalizedcoords[i] <= im_start_coords[i] || blend->normalizedcoords[i] >= im_end_coords[i] ) { FT_TRACE6(( " intermediate tuple range ]%.5f;%.5f[ is exceeded," " stop\n", im_start_coords[i] / 65536.0, im_end_coords[i] / 65536.0 )); apply = 0; break; } FT_TRACE6(( " intermediate tuple range ]%.5f;%.5f[ fits\n", im_start_coords[i] / 65536.0, im_end_coords[i] / 65536.0 )); if ( blend->normalizedcoords[i] < tuple_coords[i] ) apply = FT_MulDiv( apply, blend->normalizedcoords[i] - im_start_coords[i], tuple_coords[i] - im_start_coords[i] ); else apply = FT_MulDiv( apply, im_end_coords[i] - blend->normalizedcoords[i], im_end_coords[i] - tuple_coords[i] ); } } FT_TRACE6(( " apply factor is %.5f\n", apply / 65536.0 )); return apply; } /* convert from design coordinates to normalized coordinates */ static void ft_var_to_normalized( TT_Face face, FT_UInt num_coords, FT_Fixed* coords, FT_Fixed* normalized ) { GX_Blend blend; FT_MM_Var* mmvar; FT_UInt i, j; FT_Var_Axis* a; GX_AVarSegment av; blend = face->blend; mmvar = blend->mmvar; if ( num_coords > mmvar->num_axis ) { FT_TRACE2(( "ft_var_to_normalized:" " only using first %d of %d coordinates\n", mmvar->num_axis, num_coords )); num_coords = mmvar->num_axis; } /* 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. */ a = mmvar->axis; for ( i = 0; i < num_coords; i++, a++ ) { FT_Fixed coord = coords[i]; FT_TRACE5(( " %d: %.5f\n", i, coord / 65536.0 )); if ( coord > a->maximum || coord < a->minimum ) { FT_TRACE1(( "ft_var_to_normalized: design coordinate %.5f\n", coord / 65536.0 )); FT_TRACE1(( " is out of range [%.5f;%.5f];" " clamping\n", a->minimum / 65536.0, a->maximum / 65536.0 )); } if ( coord > a->def ) normalized[i] = coord >= a->maximum ? 0x10000L : FT_DivFix( SUB_LONG( coord, a->def ), SUB_LONG( a->maximum, a->def ) ); else if ( coord < a->def ) normalized[i] = coord <= a->minimum ? -0x10000L : FT_DivFix( SUB_LONG( coord, a->def ), SUB_LONG( a->def, a->minimum ) ); else normalized[i] = 0; } FT_TRACE5(( "\n" )); for ( ; i < mmvar->num_axis; i++ ) normalized[i] = 0; if ( blend->avar_segment ) { FT_TRACE5(( "normalized design coordinates" " before applying `avar' data:\n" )); 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 ) { FT_TRACE5(( " %.5f\n", normalized[i] / 65536.0 )); normalized[i] = FT_MulDiv( normalized[i] - av->correspondence[j - 1].fromCoord, av->correspondence[j].toCoord - av->correspondence[j - 1].toCoord, av->correspondence[j].fromCoord - av->correspondence[j - 1].fromCoord ) + av->correspondence[j - 1].toCoord; break; } } } } } /* convert from normalized coordinates to design coordinates */ static void ft_var_to_design( TT_Face face, FT_UInt num_coords, FT_Fixed* coords, FT_Fixed* design ) { GX_Blend blend; FT_MM_Var* mmvar; FT_Var_Axis* a; FT_UInt i, j, nc; blend = face->blend; nc = num_coords; if ( num_coords > blend->num_axis ) { FT_TRACE2(( "ft_var_to_design:" " only using first %d of %d coordinates\n", blend->num_axis, num_coords )); nc = blend->num_axis; } for ( i = 0; i < nc; i++ ) design[i] = coords[i]; for ( ; i < num_coords; i++ ) design[i] = 0; if ( blend->avar_segment ) { GX_AVarSegment av = blend->avar_segment; FT_TRACE5(( "design coordinates" " after removing `avar' distortion:\n" )); for ( i = 0; i < nc; i++, av++ ) { for ( j = 1; j < (FT_UInt)av->pairCount; j++ ) { if ( design[i] < av->correspondence[j].toCoord ) { design[i] = FT_MulDiv( design[i] - av->correspondence[j - 1].toCoord, av->correspondence[j].fromCoord - av->correspondence[j - 1].fromCoord, av->correspondence[j].toCoord - av->correspondence[j - 1].toCoord ) + av->correspondence[j - 1].fromCoord; FT_TRACE5(( " %.5f\n", design[i] / 65536.0 )); break; } } } } mmvar = blend->mmvar; a = mmvar->axis; for ( i = 0; i < nc; i++, a++ ) { if ( design[i] < 0 ) design[i] = a->def + FT_MulFix( design[i], a->def - a->minimum ); else if ( design[i] > 0 ) design[i] = a->def + FT_MulFix( design[i], a->maximum - a->def ); else design[i] = a->def; } } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** MULTIPLE MASTERS SERVICE FUNCTIONS *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ typedef struct GX_FVar_Head_ { FT_Long version; FT_UShort offsetToData; FT_UShort axisCount; FT_UShort axisSize; FT_UShort instanceCount; FT_UShort instanceSize; } GX_FVar_Head; typedef struct fvar_axis_ { FT_ULong axisTag; FT_Fixed minValue; FT_Fixed defaultValue; FT_Fixed 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. It also loads (and parses) the `MVAR' table, if * possible. * * @InOut: * face :: * The font face. * TT_Get_MM_Var initializes the blend structure. * * @Output: * master :: * The `fvar' data (must be freed by caller). Can be NULL, * which makes this function simply load MM support. * * @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 = FT_Err_Ok; FT_ULong fvar_start = 0; FT_UInt i, j; FT_MM_Var* mmvar = NULL; FT_Fixed* next_coords; FT_Fixed* nsc; FT_String* next_name; FT_Var_Axis* a; FT_Fixed* c; FT_Var_Named_Style* ns; GX_FVar_Head fvar_head = { 0, 0, 0, 0, 0, 0 }; FT_Bool usePsName = 0; FT_UInt num_instances; FT_UInt num_axes; FT_UShort* axis_flags; FT_Offset mmvar_size; FT_Offset axis_flags_size; FT_Offset axis_size; FT_Offset namedstyle_size; FT_Offset next_coords_size; FT_Offset next_name_size; FT_Bool need_init; 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_SKIP_SHORT, 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_LONG ( minValue ), FT_FRAME_LONG ( defaultValue ), FT_FRAME_LONG ( maxValue ), FT_FRAME_USHORT( flags ), FT_FRAME_USHORT( nameID ), FT_FRAME_END }; /* read the font data and set up the internal representation */ /* if not already done */ need_init = !face->blend; if ( need_init ) { FT_TRACE2(( "FVAR " )); /* both `fvar' and `gvar' must be present */ if ( FT_SET_ERROR( face->goto_table( face, TTAG_gvar, stream, &table_len ) ) ) { /* CFF2 is an alternate to gvar here */ if ( FT_SET_ERROR( face->goto_table( face, TTAG_CFF2, stream, &table_len ) ) ) { FT_TRACE1(( "\n" )); FT_TRACE1(( "TT_Get_MM_Var: `gvar' or `CFF2' table is missing\n" )); goto Exit; } } if ( FT_SET_ERROR( face->goto_table( face, TTAG_fvar, stream, &table_len ) ) ) { FT_TRACE1(( "is missing\n" )); goto Exit; } fvar_start = FT_STREAM_POS( ); /* the validity of the `fvar' header data was already checked */ /* in function `sfnt_init_face' */ if ( FT_STREAM_READ_FIELDS( fvar_fields, &fvar_head ) ) goto Exit; usePsName = FT_BOOL( fvar_head.instanceSize == 6 + 4 * fvar_head.axisCount ); FT_TRACE2(( "loaded\n" )); FT_TRACE5(( "%d variation ax%s\n", fvar_head.axisCount, fvar_head.axisCount == 1 ? "is" : "es" )); if ( FT_NEW( face->blend ) ) goto Exit; num_axes = fvar_head.axisCount; face->blend->num_axis = num_axes; } else num_axes = face->blend->num_axis; /* `num_instances' holds the number of all named instances, */ /* including the default instance which might be missing */ /* in fvar's table of named instances */ num_instances = (FT_UInt)face->root.style_flags >> 16; /* prepare storage area for MM data; this cannot overflow */ /* 32-bit arithmetic because of the size limits used in the */ /* `fvar' table validity check in `sfnt_init_face' */ /* the various `*_size' variables, which we also use as */ /* offsets into the `mmvar' array, must be multiples of the */ /* pointer size (except the last one); without such an */ /* alignment there might be runtime errors due to */ /* misaligned addresses */ #undef ALIGN_SIZE #define ALIGN_SIZE( n ) \ ( ( (n) + sizeof (void*) - 1 ) & ~( sizeof (void*) - 1 ) ) mmvar_size = ALIGN_SIZE( sizeof ( FT_MM_Var ) ); axis_flags_size = ALIGN_SIZE( num_axes * sizeof ( FT_UShort ) ); axis_size = ALIGN_SIZE( num_axes * sizeof ( FT_Var_Axis ) ); namedstyle_size = ALIGN_SIZE( num_instances * sizeof ( FT_Var_Named_Style ) ); next_coords_size = ALIGN_SIZE( num_instances * num_axes * sizeof ( FT_Fixed ) ); next_name_size = num_axes * 5; if ( need_init ) { face->blend->mmvar_len = mmvar_size + axis_flags_size + axis_size + namedstyle_size + next_coords_size + next_name_size; if ( FT_ALLOC( mmvar, face->blend->mmvar_len ) ) goto Exit; face->blend->mmvar = mmvar; /* set up pointers and offsets into the `mmvar' array; */ /* the data gets filled in later on */ mmvar->num_axis = num_axes; mmvar->num_designs = ~0U; /* meaningless in this context; each glyph */ /* may have a different number of designs */ /* (or tuples, as called by Apple) */ mmvar->num_namedstyles = num_instances; /* alas, no public field in `FT_Var_Axis' for axis flags */ axis_flags = (FT_UShort*)( (char*)mmvar + mmvar_size ); mmvar->axis = (FT_Var_Axis*)( (char*)axis_flags + axis_flags_size ); mmvar->namedstyle = (FT_Var_Named_Style*)( (char*)mmvar->axis + axis_size ); next_coords = (FT_Fixed*)( (char*)mmvar->namedstyle + namedstyle_size ); for ( i = 0; i < num_instances; i++ ) { mmvar->namedstyle[i].coords = next_coords; next_coords += num_axes; } next_name = (FT_String*)( (char*)mmvar->namedstyle + namedstyle_size + next_coords_size ); for ( i = 0; i < num_axes; i++ ) { mmvar->axis[i].name = next_name; next_name += 5; } /* now fill in the data */ if ( FT_STREAM_SEEK( fvar_start + fvar_head.offsetToData ) ) goto Exit; a = mmvar->axis; for ( i = 0; i < num_axes; i++ ) { GX_FVar_Axis axis_rec; #ifdef FT_DEBUG_LEVEL_TRACE int invalid = 0; #endif if ( FT_STREAM_READ_FIELDS( fvaraxis_fields, &axis_rec ) ) goto Exit; a->tag = axis_rec.axisTag; a->minimum = axis_rec.minValue; a->def = axis_rec.defaultValue; a->maximum = axis_rec.maxValue; 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'; *axis_flags = axis_rec.flags; if ( a->minimum > a->def || a->def > a->maximum ) { a->minimum = a->def; a->maximum = a->def; #ifdef FT_DEBUG_LEVEL_TRACE invalid = 1; #endif } #ifdef FT_DEBUG_LEVEL_TRACE if ( i == 0 ) FT_TRACE5(( " idx tag " /* " XXX `XXXX'" */ " minimum default maximum flags\n" )); /* " XXXX.XXXXX XXXX.XXXXX XXXX.XXXXX 0xXXXX" */ FT_TRACE5(( " %3d `%s'" " %10.5f %10.5f %10.5f 0x%04X%s\n", i, a->name, a->minimum / 65536.0, a->def / 65536.0, a->maximum / 65536.0, *axis_flags, invalid ? " (invalid, disabled)" : "" )); #endif a++; axis_flags++; } FT_TRACE5(( "\n" )); /* named instance coordinates are stored as design coordinates; */ /* we have to convert them to normalized coordinates also */ if ( FT_NEW_ARRAY( face->blend->normalized_stylecoords, num_axes * num_instances ) ) goto Exit; if ( fvar_head.instanceCount && !face->blend->avar_loaded ) { FT_ULong offset = FT_STREAM_POS(); ft_var_load_avar( face ); if ( FT_STREAM_SEEK( offset ) ) goto Exit; } FT_TRACE5(( "%d instance%s\n", fvar_head.instanceCount, fvar_head.instanceCount == 1 ? "" : "s" )); ns = mmvar->namedstyle; nsc = face->blend->normalized_stylecoords; for ( i = 0; i < fvar_head.instanceCount; i++, ns++ ) { /* PostScript names add 2 bytes to the instance record size */ if ( FT_FRAME_ENTER( ( usePsName ? 6L : 4L ) + 4L * num_axes ) ) goto Exit; ns->strid = FT_GET_USHORT(); (void) /* flags = */ FT_GET_USHORT(); c = ns->coords; for ( j = 0; j < num_axes; j++, c++ ) *c = FT_GET_LONG(); /* valid psid values are 6, [256;32767], and 0xFFFF */ if ( usePsName ) ns->psid = FT_GET_USHORT(); else ns->psid = 0xFFFF; #ifdef FT_DEBUG_LEVEL_TRACE { SFNT_Service sfnt = (SFNT_Service)face->sfnt; FT_String* strname = NULL; FT_String* psname = NULL; FT_ULong pos; pos = FT_STREAM_POS(); if ( ns->strid != 0xFFFF ) { (void)sfnt->get_name( face, (FT_UShort)ns->strid, &strname ); if ( strname && !ft_strcmp( strname, ".notdef" ) ) strname = NULL; } if ( ns->psid != 0xFFFF ) { (void)sfnt->get_name( face, (FT_UShort)ns->psid, &psname ); if ( psname && !ft_strcmp( psname, ".notdef" ) ) psname = NULL; } (void)FT_STREAM_SEEK( pos ); FT_TRACE5(( " instance %d (%s%s%s, %s%s%s)\n", i, strname ? "name: `" : "", strname ? strname : "unnamed", strname ? "'" : "", psname ? "PS name: `" : "", psname ? psname : "no PS name", psname ? "'" : "" )); FT_FREE( strname ); FT_FREE( psname ); } #endif /* FT_DEBUG_LEVEL_TRACE */ ft_var_to_normalized( face, num_axes, ns->coords, nsc ); nsc += num_axes; FT_FRAME_EXIT(); } if ( num_instances != fvar_head.instanceCount ) { SFNT_Service sfnt = (SFNT_Service)face->sfnt; FT_Int found, dummy1, dummy2; FT_UInt strid = ~0U; /* the default instance is missing in array the */ /* of named instances; try to synthesize an entry */ found = sfnt->get_name_id( face, TT_NAME_ID_TYPOGRAPHIC_SUBFAMILY, &dummy1, &dummy2 ); if ( found ) strid = TT_NAME_ID_TYPOGRAPHIC_SUBFAMILY; else { found = sfnt->get_name_id( face, TT_NAME_ID_FONT_SUBFAMILY, &dummy1, &dummy2 ); if ( found ) strid = TT_NAME_ID_FONT_SUBFAMILY; } if ( found ) { found = sfnt->get_name_id( face, TT_NAME_ID_PS_NAME, &dummy1, &dummy2 ); if ( found ) { FT_TRACE5(( "TT_Get_MM_Var:" " Adding default instance to named instances\n" )); ns = &mmvar->namedstyle[fvar_head.instanceCount]; ns->strid = strid; ns->psid = TT_NAME_ID_PS_NAME; a = mmvar->axis; c = ns->coords; for ( j = 0; j < num_axes; j++, a++, c++ ) *c = a->def; } } } ft_var_load_mvar( face ); } /* fill the output array if requested */ if ( master ) { FT_UInt n; if ( FT_ALLOC( mmvar, face->blend->mmvar_len ) ) goto Exit; FT_MEM_COPY( mmvar, face->blend->mmvar, face->blend->mmvar_len ); axis_flags = (FT_UShort*)( (char*)mmvar + mmvar_size ); mmvar->axis = (FT_Var_Axis*)( (char*)axis_flags + axis_flags_size ); mmvar->namedstyle = (FT_Var_Named_Style*)( (char*)mmvar->axis+ axis_size ); next_coords = (FT_Fixed*)( (char*)mmvar->namedstyle + namedstyle_size ); for ( n = 0; n < mmvar->num_namedstyles; n++ ) { mmvar->namedstyle[n].coords = next_coords; next_coords += num_axes; } a = mmvar->axis; next_name = (FT_String*)( (char*)mmvar->namedstyle + namedstyle_size + next_coords_size ); for ( n = 0; n < num_axes; 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; } static FT_Error tt_set_mm_blend( TT_Face face, FT_UInt num_coords, FT_Fixed* coords, FT_Bool set_design_coords ) { FT_Error error = FT_Err_Ok; GX_Blend blend; FT_MM_Var* mmvar; FT_UInt i; FT_Bool all_design_coords = FALSE; FT_Memory memory = face->root.memory; enum { mcvt_retain, mcvt_modify, mcvt_load } manageCvt; face->doblend = FALSE; if ( !face->blend ) { if ( FT_SET_ERROR( TT_Get_MM_Var( face, NULL ) ) ) goto Exit; } blend = face->blend; mmvar = blend->mmvar; if ( num_coords > mmvar->num_axis ) { FT_TRACE2(( "TT_Set_MM_Blend:" " only using first %d of %d coordinates\n", mmvar->num_axis, num_coords )); num_coords = mmvar->num_axis; } FT_TRACE5(( "TT_Set_MM_Blend:\n" )); FT_TRACE5(( " normalized design coordinates:\n" )); for ( i = 0; i < num_coords; i++ ) { FT_TRACE5(( " %.5f\n", coords[i] / 65536.0 )); if ( coords[i] < -0x00010000L || coords[i] > 0x00010000L ) { FT_TRACE1(( "TT_Set_MM_Blend: normalized design coordinate %.5f\n", coords[i] / 65536.0 )); FT_TRACE1(( " is out of range [-1;1]\n" )); error = FT_THROW( Invalid_Argument ); goto Exit; } } FT_TRACE5(( "\n" )); if ( !face->is_cff2 && !blend->glyphoffsets ) if ( FT_SET_ERROR( ft_var_load_gvar( face ) ) ) goto Exit; if ( !blend->coords ) { if ( FT_NEW_ARRAY( blend->coords, mmvar->num_axis ) ) goto Exit; /* the first time we have to compute all design coordinates */ all_design_coords = TRUE; } if ( !blend->normalizedcoords ) { if ( FT_NEW_ARRAY( blend->normalizedcoords, mmvar->num_axis ) ) 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 { FT_Bool have_diff = 0; FT_UInt j; FT_Fixed* c; FT_Fixed* n; manageCvt = mcvt_retain; for ( i = 0; i < num_coords; i++ ) { if ( blend->normalizedcoords[i] != coords[i] ) { manageCvt = mcvt_load; have_diff = 1; break; } } if ( FT_IS_NAMED_INSTANCE( FT_FACE( face ) ) ) { FT_UInt instance_index = (FT_UInt)face->root.face_index >> 16; c = blend->normalizedcoords + i; n = blend->normalized_stylecoords + ( instance_index - 1 ) * mmvar->num_axis + i; for ( j = i; j < mmvar->num_axis; j++, n++, c++ ) if ( *c != *n ) have_diff = 1; } else { c = blend->normalizedcoords + i; for ( j = i; j < mmvar->num_axis; j++, c++ ) if ( *c != 0 ) have_diff = 1; } /* return value -1 indicates `no change' */ if ( !have_diff ) { face->doblend = TRUE; return -1; } for ( ; i < mmvar->num_axis; i++ ) { if ( blend->normalizedcoords[i] != 0 ) { 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 = mmvar->num_axis; if ( coords ) FT_MEM_COPY( blend->normalizedcoords, coords, num_coords * sizeof ( FT_Fixed ) ); if ( set_design_coords ) ft_var_to_design( face, all_design_coords ? blend->num_axis : num_coords, blend->normalizedcoords, blend->coords ); face->doblend = TRUE; if ( face->cvt ) { 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 ); error = 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). */ error = tt_face_vary_cvt( face, face->root.stream ); break; case mcvt_retain: /* The cvt table is correct for this set of coordinates. */ break; } } /* enforce recomputation of the PostScript name; */ FT_FREE( face->postscript_name ); 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 :: * The number of available coordinates. If it is * larger than the number of axes, ignore the excess * values. If it is smaller than the number of axes, * use the default value (0) for the remaining axes. * * 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; error = tt_set_mm_blend( face, num_coords, coords, 1 ); if ( error ) return error; if ( num_coords ) face->root.face_flags |= FT_FACE_FLAG_VARIATION; else face->root.face_flags &= ~FT_FACE_FLAG_VARIATION; return FT_Err_Ok; } /************************************************************************** * * @Function: * TT_Get_MM_Blend * * @Description: * Get the blend (normalized) coordinates for this instance of the * font. * * @InOut: * face :: * The font. * Initialize the blend structure with `gvar' data. * * @Input: * num_coords :: * The number of available coordinates. If it is * larger than the number of axes, set the excess * values to 0. * * coords :: * An array of `num_coords', each between [-1,1]. * * @Return: * FreeType error code. 0 means success. */ FT_LOCAL_DEF( FT_Error ) TT_Get_MM_Blend( TT_Face face, FT_UInt num_coords, FT_Fixed* coords ) { FT_Error error = FT_Err_Ok; GX_Blend blend; FT_UInt i, nc; if ( !face->blend ) { if ( FT_SET_ERROR( TT_Get_MM_Var( face, NULL ) ) ) return error; } blend = face->blend; if ( !blend->coords ) { /* select default instance coordinates */ /* if no instance is selected yet */ if ( FT_SET_ERROR( tt_set_mm_blend( face, 0, NULL, 1 ) ) ) return error; } nc = num_coords; if ( num_coords > blend->num_axis ) { FT_TRACE2(( "TT_Get_MM_Blend:" " only using first %d of %d coordinates\n", blend->num_axis, num_coords )); nc = blend->num_axis; } if ( face->doblend ) { for ( i = 0; i < nc; i++ ) coords[i] = blend->normalizedcoords[i]; } else { for ( i = 0; i < nc; i++ ) coords[i] = 0; } for ( ; i < num_coords; i++ ) coords[i] = 0; return FT_Err_Ok; } /************************************************************************** * * @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 :: * The number of available coordinates. If it is * larger than the number of axes, ignore the excess * values. If it is smaller than the number of axes, * use the default values for the remaining axes. * * 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 = FT_Err_Ok; GX_Blend blend; FT_MM_Var* mmvar; FT_UInt i; FT_Memory memory = face->root.memory; FT_Fixed* c; FT_Fixed* n; FT_Fixed* normalized = NULL; FT_Bool have_diff = 0; if ( !face->blend ) { if ( FT_SET_ERROR( TT_Get_MM_Var( face, NULL ) ) ) goto Exit; } blend = face->blend; mmvar = blend->mmvar; if ( num_coords > mmvar->num_axis ) { FT_TRACE2(( "TT_Set_Var_Design:" " only using first %d of %d coordinates\n", mmvar->num_axis, num_coords )); num_coords = mmvar->num_axis; } if ( !blend->coords ) { if ( FT_NEW_ARRAY( blend->coords, mmvar->num_axis ) ) goto Exit; } c = blend->coords; n = coords; for ( i = 0; i < num_coords; i++, n++, c++ ) { if ( *c != *n ) { *c = *n; have_diff = 1; } } if ( FT_IS_NAMED_INSTANCE( FT_FACE( face ) ) ) { FT_UInt instance_index; FT_Var_Named_Style* named_style; instance_index = (FT_UInt)face->root.face_index >> 16; named_style = mmvar->namedstyle + instance_index - 1; n = named_style->coords + num_coords; for ( ; i < mmvar->num_axis; i++, n++, c++ ) { if ( *c != *n ) { *c = *n; have_diff = 1; } } } else { FT_Var_Axis* a; a = mmvar->axis + num_coords; for ( ; i < mmvar->num_axis; i++, a++, c++ ) { if ( *c != a->def ) { *c = a->def; have_diff = 1; } } } /* return value -1 indicates `no change'; */ /* we can exit early if `normalizedcoords' is already computed */ if ( blend->normalizedcoords && !have_diff ) return -1; if ( FT_NEW_ARRAY( normalized, mmvar->num_axis ) ) goto Exit; if ( !face->blend->avar_loaded ) ft_var_load_avar( face ); FT_TRACE5(( "TT_Set_Var_Design:\n" )); FT_TRACE5(( " normalized design coordinates:\n" )); ft_var_to_normalized( face, num_coords, blend->coords, normalized ); error = tt_set_mm_blend( face, mmvar->num_axis, normalized, 0 ); if ( error ) goto Exit; if ( num_coords ) face->root.face_flags |= FT_FACE_FLAG_VARIATION; else face->root.face_flags &= ~FT_FACE_FLAG_VARIATION; Exit: FT_FREE( normalized ); return error; } /************************************************************************** * * @Function: * TT_Get_Var_Design * * @Description: * Get the design coordinates of the currently selected interpolated * font. * * @Input: * face :: * A handle to the source face. * * num_coords :: * The number of design coordinates to retrieve. If it * is larger than the number of axes, set the excess * values to~0. * * @Output: * coords :: * The design coordinates array. * * @Return: * FreeType error code. 0~means success. */ FT_LOCAL_DEF( FT_Error ) TT_Get_Var_Design( TT_Face face, FT_UInt num_coords, FT_Fixed* coords ) { FT_Error error = FT_Err_Ok; GX_Blend blend; FT_UInt i, nc; if ( !face->blend ) { if ( FT_SET_ERROR( TT_Get_MM_Var( face, NULL ) ) ) return error; } blend = face->blend; if ( !blend->coords ) { /* select default instance coordinates */ /* if no instance is selected yet */ if ( FT_SET_ERROR( tt_set_mm_blend( face, 0, NULL, 1 ) ) ) return error; } nc = num_coords; if ( num_coords > blend->num_axis ) { FT_TRACE2(( "TT_Get_Var_Design:" " only using first %d of %d coordinates\n", blend->num_axis, num_coords )); nc = blend->num_axis; } if ( face->doblend ) { for ( i = 0; i < nc; i++ ) coords[i] = blend->coords[i]; } else { for ( i = 0; i < nc; i++ ) coords[i] = 0; } for ( ; i < num_coords; i++ ) coords[i] = 0; return FT_Err_Ok; } /************************************************************************** * * @Function: * TT_Set_Named_Instance * * @Description: * Set the given named instance, also resetting any further * variation. * * @Input: * face :: * A handle to the source face. * * instance_index :: * The instance index, starting with value 1. * Value 0 indicates to not use an instance. * * @Return: * FreeType error code. 0~means success. */ FT_LOCAL_DEF( FT_Error ) TT_Set_Named_Instance( TT_Face face, FT_UInt instance_index ) { FT_Error error; GX_Blend blend; FT_MM_Var* mmvar; FT_UInt num_instances; if ( !face->blend ) { if ( FT_SET_ERROR( TT_Get_MM_Var( face, NULL ) ) ) goto Exit; } blend = face->blend; mmvar = blend->mmvar; num_instances = (FT_UInt)face->root.style_flags >> 16; /* `instance_index' starts with value 1, thus `>' */ if ( instance_index > num_instances ) { error = FT_ERR( Invalid_Argument ); goto Exit; } if ( instance_index > 0 ) { FT_Memory memory = face->root.memory; SFNT_Service sfnt = (SFNT_Service)face->sfnt; FT_Var_Named_Style* named_style; FT_String* style_name; named_style = mmvar->namedstyle + instance_index - 1; error = sfnt->get_name( face, (FT_UShort)named_style->strid, &style_name ); if ( error ) goto Exit; /* set (or replace) style name */ FT_FREE( face->root.style_name ); face->root.style_name = style_name; /* finally, select the named instance */ error = TT_Set_Var_Design( face, mmvar->num_axis, named_style->coords ); if ( error ) { /* internal error code -1 means `no change' */ if ( error == -1 ) error = FT_Err_Ok; goto Exit; } } else error = TT_Set_Var_Design( face, 0, NULL ); face->root.face_index = ( instance_index << 16 ) | ( face->root.face_index & 0xFFFFL ); face->root.face_flags &= ~FT_FACE_FLAG_VARIATION; Exit: return error; } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** GX VAR PARSING ROUTINES *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER static FT_Error tt_cvt_ready_iterator( FT_ListNode node, void* user ) { TT_Size size = (TT_Size)node->data; FT_UNUSED( user ); size->cvt_ready = -1; return FT_Err_Ok; } #endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ /************************************************************************** * * @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 ) { #ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER FT_Error error; FT_Memory memory = stream->memory; FT_Face root = &face->root; 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_UInt spoint_count = 0; FT_UShort* sharedpoints = NULL; FT_UShort* localpoints = NULL; FT_UShort* points; FT_Fixed* deltas = NULL; FT_Fixed* cvt_deltas = NULL; FT_TRACE2(( "CVAR " )); if ( !blend ) { FT_TRACE2(( "\n" )); FT_TRACE2(( "tt_face_vary_cvt: no blend specified\n" )); error = FT_Err_Ok; goto Exit; } if ( !face->cvt ) { FT_TRACE2(( "\n" )); FT_TRACE2(( "tt_face_vary_cvt: no `cvt ' table\n" )); error = FT_Err_Ok; goto Exit; } error = face->goto_table( face, TTAG_cvar, stream, &table_len ); if ( error ) { FT_TRACE2(( "is missing\n" )); error = FT_Err_Ok; goto Exit; } if ( FT_FRAME_ENTER( table_len ) ) { error = FT_Err_Ok; goto Exit; } table_start = FT_Stream_FTell( stream ); if ( FT_GET_LONG() != 0x00010000L ) { FT_TRACE2(( "bad table version\n" )); error = FT_Err_Ok; goto FExit; } FT_TRACE2(( "loaded\n" )); 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 = FT_GET_USHORT(); /* rough sanity test */ if ( offsetToData + ( tupleCount & GX_TC_TUPLE_COUNT_MASK ) * 4 > table_len ) { FT_TRACE2(( "tt_face_vary_cvt:" " invalid CVT variation array header\n" )); error = FT_THROW( Invalid_Table ); goto FExit; } offsetToData += table_start; if ( tupleCount & GX_TC_TUPLES_SHARE_POINT_NUMBERS ) { here = FT_Stream_FTell( stream ); FT_Stream_SeekSet( stream, offsetToData ); sharedpoints = ft_var_readpackedpoints( stream, table_len, &spoint_count ); offsetToData = FT_Stream_FTell( stream ); FT_Stream_SeekSet( stream, here ); } FT_TRACE5(( "cvar: there %s %d tuple%s:\n", ( tupleCount & GX_TC_TUPLE_COUNT_MASK ) == 1 ? "is" : "are", tupleCount & GX_TC_TUPLE_COUNT_MASK, ( tupleCount & GX_TC_TUPLE_COUNT_MASK ) == 1 ? "" : "s" )); if ( FT_NEW_ARRAY( cvt_deltas, face->cvt_size ) ) goto FExit; for ( i = 0; i < ( tupleCount & GX_TC_TUPLE_COUNT_MASK ); i++ ) { FT_UInt tupleDataSize; FT_UInt tupleIndex; FT_Fixed apply; FT_TRACE6(( " tuple %d:\n", i )); 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_fdot14ToFixed( FT_GET_SHORT() ); } else if ( ( tupleIndex & GX_TI_TUPLE_INDEX_MASK ) >= blend->tuplecount ) { FT_TRACE2(( "tt_face_vary_cvt:" " invalid tuple index\n" )); error = FT_THROW( Invalid_Table ); goto FExit; } else { if ( !blend->tuplecoords ) { FT_TRACE2(( "tt_face_vary_cvt:" " no valid tuple coordinates available\n" )); error = FT_THROW( Invalid_Table ); goto FExit; } FT_MEM_COPY( tuple_coords, blend->tuplecoords + ( tupleIndex & GX_TI_TUPLE_INDEX_MASK ) * 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_fdot14ToFixed( FT_GET_SHORT() ); for ( j = 0; j < blend->num_axis; j++ ) im_end_coords[j] = FT_fdot14ToFixed( FT_GET_SHORT() ); } 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 ); FT_Stream_SeekSet( stream, offsetToData ); if ( tupleIndex & GX_TI_PRIVATE_POINT_NUMBERS ) { localpoints = ft_var_readpackedpoints( stream, table_len, &point_count ); points = localpoints; } else { localpoints = NULL; points = sharedpoints; point_count = spoint_count; } deltas = ft_var_readpackeddeltas( stream, table_len, point_count == 0 ? face->cvt_size : point_count ); if ( !points || !deltas ) ; /* failure, ignore it */ else if ( localpoints == ALL_POINTS ) { #ifdef FT_DEBUG_LEVEL_TRACE int count = 0; #endif FT_TRACE7(( " CVT deltas:\n" )); /* this means that there are deltas for every entry in cvt */ for ( j = 0; j < face->cvt_size; j++ ) { FT_Fixed old_cvt_delta; old_cvt_delta = cvt_deltas[j]; cvt_deltas[j] = old_cvt_delta + FT_MulFix( deltas[j], apply ); #ifdef FT_DEBUG_LEVEL_TRACE if ( old_cvt_delta != cvt_deltas[j] ) { FT_TRACE7(( " %d: %f -> %f\n", j, ( FT_fdot6ToFixed( face->cvt[j] ) + old_cvt_delta ) / 65536.0, ( FT_fdot6ToFixed( face->cvt[j] ) + cvt_deltas[j] ) / 65536.0 )); count++; } #endif } #ifdef FT_DEBUG_LEVEL_TRACE if ( !count ) FT_TRACE7(( " none\n" )); #endif } else { #ifdef FT_DEBUG_LEVEL_TRACE int count = 0; #endif FT_TRACE7(( " CVT deltas:\n" )); for ( j = 0; j < point_count; j++ ) { int pindex; FT_Fixed old_cvt_delta; pindex = points[j]; if ( (FT_ULong)pindex >= face->cvt_size ) continue; old_cvt_delta = cvt_deltas[pindex]; cvt_deltas[pindex] = old_cvt_delta + FT_MulFix( deltas[j], apply ); #ifdef FT_DEBUG_LEVEL_TRACE if ( old_cvt_delta != cvt_deltas[pindex] ) { FT_TRACE7(( " %d: %f -> %f\n", pindex, ( FT_fdot6ToFixed( face->cvt[pindex] ) + old_cvt_delta ) / 65536.0, ( FT_fdot6ToFixed( face->cvt[pindex] ) + cvt_deltas[pindex] ) / 65536.0 )); count++; } #endif } #ifdef FT_DEBUG_LEVEL_TRACE if ( !count ) FT_TRACE7(( " none\n" )); #endif } if ( localpoints != ALL_POINTS ) FT_FREE( localpoints ); FT_FREE( deltas ); offsetToData += tupleDataSize; FT_Stream_SeekSet( stream, here ); } FT_TRACE5(( "\n" )); for ( i = 0; i < face->cvt_size; i++ ) face->cvt[i] += FT_fixedToFdot6( cvt_deltas[i] ); FExit: FT_FRAME_EXIT(); Exit: if ( sharedpoints != ALL_POINTS ) FT_FREE( sharedpoints ); FT_FREE( tuple_coords ); FT_FREE( im_start_coords ); FT_FREE( im_end_coords ); FT_FREE( cvt_deltas ); /* iterate over all FT_Size objects and set `cvt_ready' to -1 */ /* to trigger rescaling of all CVT values */ FT_List_Iterate( &root->sizes_list, tt_cvt_ready_iterator, NULL ); return error; #else /* !TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ FT_UNUSED( face ); FT_UNUSED( stream ); return FT_Err_Ok; #endif /* !TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ } /* Shift the original coordinates of all points between indices `p1' */ /* and `p2', using the same difference as given by index `ref'. */ /* modeled after `af_iup_shift' */ static void tt_delta_shift( int p1, int p2, int ref, FT_Vector* in_points, FT_Vector* out_points ) { int p; FT_Vector delta; delta.x = out_points[ref].x - in_points[ref].x; delta.y = out_points[ref].y - in_points[ref].y; if ( delta.x == 0 && delta.y == 0 ) return; for ( p = p1; p < ref; p++ ) { out_points[p].x += delta.x; out_points[p].y += delta.y; } for ( p = ref + 1; p <= p2; p++ ) { out_points[p].x += delta.x; out_points[p].y += delta.y; } } /* Interpolate the original coordinates of all points with indices */ /* between `p1' and `p2', using `ref1' and `ref2' as the reference */ /* point indices. */ /* modeled after `af_iup_interp', `_iup_worker_interpolate', and */ /* `Ins_IUP' with spec differences in handling ill-defined cases. */ static void tt_delta_interpolate( int p1, int p2, int ref1, int ref2, FT_Vector* in_points, FT_Vector* out_points ) { int p, i; FT_Pos out, in1, in2, out1, out2, d1, d2; if ( p1 > p2 ) return; /* handle both horizontal and vertical coordinates */ for ( i = 0; i <= 1; i++ ) { /* shift array pointers so that we can access `foo.y' as `foo.x' */ in_points = (FT_Vector*)( (FT_Pos*)in_points + i ); out_points = (FT_Vector*)( (FT_Pos*)out_points + i ); if ( in_points[ref1].x > in_points[ref2].x ) { p = ref1; ref1 = ref2; ref2 = p; } in1 = in_points[ref1].x; in2 = in_points[ref2].x; out1 = out_points[ref1].x; out2 = out_points[ref2].x; d1 = out1 - in1; d2 = out2 - in2; /* If the reference points have the same coordinate but different */ /* delta, inferred delta is zero. Otherwise interpolate. */ if ( in1 != in2 || out1 == out2 ) { FT_Fixed scale = in1 != in2 ? FT_DivFix( out2 - out1, in2 - in1 ) : 0; for ( p = p1; p <= p2; p++ ) { out = in_points[p].x; if ( out <= in1 ) out += d1; else if ( out >= in2 ) out += d2; else out = out1 + FT_MulFix( out - in1, scale ); out_points[p].x = out; } } } } /* Interpolate points without delta values, similar to */ /* the `IUP' hinting instruction. */ /* modeled after `Ins_IUP */ static void tt_interpolate_deltas( FT_Outline* outline, FT_Vector* out_points, FT_Vector* in_points, FT_Bool* has_delta ) { FT_Int first_point; FT_Int end_point; FT_Int first_delta; FT_Int cur_delta; FT_Int point; FT_Short contour; /* ignore empty outlines */ if ( !outline->n_contours ) return; contour = 0; point = 0; do { end_point = outline->contours[contour]; first_point = point; /* search first point that has a delta */ while ( point <= end_point && !has_delta[point] ) point++; if ( point <= end_point ) { first_delta = point; cur_delta = point; point++; while ( point <= end_point ) { /* search next point that has a delta */ /* and interpolate intermediate points */ if ( has_delta[point] ) { tt_delta_interpolate( cur_delta + 1, point - 1, cur_delta, point, in_points, out_points ); cur_delta = point; } point++; } /* shift contour if we only have a single delta */ if ( cur_delta == first_delta ) tt_delta_shift( first_point, end_point, cur_delta, in_points, out_points ); else { /* otherwise handle remaining points */ /* at the end and beginning of the contour */ tt_delta_interpolate( cur_delta + 1, end_point, cur_delta, first_delta, in_points, out_points ); if ( first_delta > 0 ) tt_delta_interpolate( first_point, first_delta - 1, cur_delta, first_delta, in_points, out_points ); } } contour++; } while ( contour < outline->n_contours ); } /************************************************************************** * * @Function: * TT_Vary_Apply_Glyph_Deltas * * @Description: * Apply the appropriate deltas to 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. * * @InOut: * outline :: * The outline to change. * * @Output: * unrounded :: * An array with `n_points' elements that is filled with unrounded * point coordinates (in 26.6 format). * * @Return: * FreeType error code. 0 means success. */ FT_LOCAL_DEF( FT_Error ) TT_Vary_Apply_Glyph_Deltas( TT_Face face, FT_UInt glyph_index, FT_Outline* outline, FT_Vector* unrounded, FT_UInt n_points ) { FT_Error error; FT_Stream stream = face->root.stream; FT_Memory memory = stream->memory; FT_Vector* points_org = NULL; /* coordinates in 16.16 format */ FT_Vector* points_out = NULL; /* coordinates in 16.16 format */ FT_Bool* has_delta = NULL; FT_ULong glyph_start; FT_UInt tupleCount; FT_ULong offsetToData; FT_ULong dataSize; 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_UInt spoint_count = 0; FT_UShort* sharedpoints = NULL; FT_UShort* localpoints = NULL; FT_UShort* points; FT_Fixed* deltas_x = NULL; FT_Fixed* deltas_y = NULL; FT_Fixed* point_deltas_x = NULL; FT_Fixed* point_deltas_y = NULL; if ( !face->doblend || !blend ) return FT_THROW( Invalid_Argument ); for ( i = 0; i < n_points; i++ ) { unrounded[i].x = INT_TO_F26DOT6( outline->points[i].x ); unrounded[i].y = INT_TO_F26DOT6( outline->points[i].y ); } if ( glyph_index >= blend->gv_glyphcnt || blend->glyphoffsets[glyph_index] == blend->glyphoffsets[glyph_index + 1] ) { FT_TRACE2(( "TT_Vary_Apply_Glyph_Deltas:" " no variation data for glyph %d\n", glyph_index )); return FT_Err_Ok; } if ( FT_NEW_ARRAY( points_org, n_points ) || FT_NEW_ARRAY( points_out, n_points ) || FT_NEW_ARRAY( has_delta, n_points ) ) goto Fail1; dataSize = blend->glyphoffsets[glyph_index + 1] - blend->glyphoffsets[glyph_index]; if ( FT_STREAM_SEEK( blend->glyphoffsets[glyph_index] ) || FT_FRAME_ENTER( dataSize ) ) goto Fail1; glyph_start = FT_Stream_FTell( stream ); /* each set of glyph variation data is formatted similarly to `cvar' */ 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 = FT_GET_USHORT(); /* rough sanity test */ if ( offsetToData > dataSize || ( tupleCount & GX_TC_TUPLE_COUNT_MASK ) * 4 > dataSize ) { FT_TRACE2(( "TT_Vary_Apply_Glyph_Deltas:" " invalid glyph variation array header\n" )); error = FT_THROW( Invalid_Table ); goto Fail2; } offsetToData += glyph_start; if ( tupleCount & GX_TC_TUPLES_SHARE_POINT_NUMBERS ) { here = FT_Stream_FTell( stream ); FT_Stream_SeekSet( stream, offsetToData ); sharedpoints = ft_var_readpackedpoints( stream, blend->gvar_size, &spoint_count ); offsetToData = FT_Stream_FTell( stream ); FT_Stream_SeekSet( stream, here ); } FT_TRACE5(( "gvar: there %s %d tuple%s:\n", ( tupleCount & GX_TC_TUPLE_COUNT_MASK ) == 1 ? "is" : "are", tupleCount & GX_TC_TUPLE_COUNT_MASK, ( tupleCount & GX_TC_TUPLE_COUNT_MASK ) == 1 ? "" : "s" )); if ( FT_NEW_ARRAY( point_deltas_x, n_points ) || FT_NEW_ARRAY( point_deltas_y, n_points ) ) goto Fail3; for ( j = 0; j < n_points; j++ ) { points_org[j].x = FT_intToFixed( outline->points[j].x ); points_org[j].y = FT_intToFixed( outline->points[j].y ); } for ( i = 0; i < ( tupleCount & GX_TC_TUPLE_COUNT_MASK ); i++ ) { FT_UInt tupleDataSize; FT_UInt tupleIndex; FT_Fixed apply; FT_TRACE6(( " tuple %d:\n", i )); 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_fdot14ToFixed( FT_GET_SHORT() ); } else if ( ( tupleIndex & GX_TI_TUPLE_INDEX_MASK ) >= blend->tuplecount ) { FT_TRACE2(( "TT_Vary_Apply_Glyph_Deltas:" " invalid tuple index\n" )); error = FT_THROW( Invalid_Table ); goto Fail3; } else FT_MEM_COPY( tuple_coords, blend->tuplecoords + ( tupleIndex & GX_TI_TUPLE_INDEX_MASK ) * 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_fdot14ToFixed( FT_GET_SHORT() ); for ( j = 0; j < blend->num_axis; j++ ) im_end_coords[j] = FT_fdot14ToFixed( FT_GET_SHORT() ); } 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 ); FT_Stream_SeekSet( stream, offsetToData ); if ( tupleIndex & GX_TI_PRIVATE_POINT_NUMBERS ) { localpoints = ft_var_readpackedpoints( stream, blend->gvar_size, &point_count ); points = localpoints; } else { points = sharedpoints; point_count = spoint_count; } deltas_x = ft_var_readpackeddeltas( stream, blend->gvar_size, point_count == 0 ? n_points : point_count ); deltas_y = ft_var_readpackeddeltas( stream, blend->gvar_size, point_count == 0 ? n_points : point_count ); if ( !points || !deltas_y || !deltas_x ) ; /* failure, ignore it */ else if ( points == ALL_POINTS ) { #ifdef FT_DEBUG_LEVEL_TRACE int count = 0; #endif FT_TRACE7(( " point deltas:\n" )); /* this means that there are deltas for every point in the glyph */ for ( j = 0; j < n_points; j++ ) { FT_Fixed old_point_delta_x = point_deltas_x[j]; FT_Fixed old_point_delta_y = point_deltas_y[j]; FT_Fixed point_delta_x = FT_MulFix( deltas_x[j], apply ); FT_Fixed point_delta_y = FT_MulFix( deltas_y[j], apply ); if ( j < n_points - 4 ) { point_deltas_x[j] = old_point_delta_x + point_delta_x; point_deltas_y[j] = old_point_delta_y + point_delta_y; } else { /* To avoid double adjustment of advance width or height, */ /* adjust phantom points only if there is no HVAR or VVAR */ /* support, respectively. */ if ( j == ( n_points - 4 ) && !( face->variation_support & TT_FACE_FLAG_VAR_LSB ) ) point_deltas_x[j] = old_point_delta_x + point_delta_x; else if ( j == ( n_points - 3 ) && !( face->variation_support & TT_FACE_FLAG_VAR_HADVANCE ) ) point_deltas_x[j] = old_point_delta_x + point_delta_x; else if ( j == ( n_points - 2 ) && !( face->variation_support & TT_FACE_FLAG_VAR_TSB ) ) point_deltas_y[j] = old_point_delta_y + point_delta_y; else if ( j == ( n_points - 1 ) && !( face->variation_support & TT_FACE_FLAG_VAR_VADVANCE ) ) point_deltas_y[j] = old_point_delta_y + point_delta_y; } #ifdef FT_DEBUG_LEVEL_TRACE if ( point_delta_x || point_delta_y ) { FT_TRACE7(( " %d: (%f, %f) -> (%f, %f)\n", j, ( FT_intToFixed( outline->points[j].x ) + old_point_delta_x ) / 65536.0, ( FT_intToFixed( outline->points[j].y ) + old_point_delta_y ) / 65536.0, ( FT_intToFixed( outline->points[j].x ) + point_deltas_x[j] ) / 65536.0, ( FT_intToFixed( outline->points[j].y ) + point_deltas_y[j] ) / 65536.0 )); count++; } #endif } #ifdef FT_DEBUG_LEVEL_TRACE if ( !count ) FT_TRACE7(( " none\n" )); #endif } else { #ifdef FT_DEBUG_LEVEL_TRACE int count = 0; #endif /* we have to interpolate the missing deltas similar to the */ /* IUP bytecode instruction */ for ( j = 0; j < n_points; j++ ) { has_delta[j] = FALSE; points_out[j] = points_org[j]; } for ( j = 0; j < point_count; j++ ) { FT_UShort idx = points[j]; if ( idx >= n_points ) continue; has_delta[idx] = TRUE; points_out[idx].x += FT_MulFix( deltas_x[j], apply ); points_out[idx].y += FT_MulFix( deltas_y[j], apply ); } /* no need to handle phantom points here, */ /* since solitary points can't be interpolated */ tt_interpolate_deltas( outline, points_out, points_org, has_delta ); FT_TRACE7(( " point deltas:\n" )); for ( j = 0; j < n_points; j++ ) { FT_Fixed old_point_delta_x = point_deltas_x[j]; FT_Fixed old_point_delta_y = point_deltas_y[j]; FT_Pos point_delta_x = points_out[j].x - points_org[j].x; FT_Pos point_delta_y = points_out[j].y - points_org[j].y; if ( j < n_points - 4 ) { point_deltas_x[j] = old_point_delta_x + point_delta_x; point_deltas_y[j] = old_point_delta_y + point_delta_y; } else { /* To avoid double adjustment of advance width or height, */ /* adjust phantom points only if there is no HVAR or VVAR */ /* support, respectively. */ if ( j == ( n_points - 4 ) && !( face->variation_support & TT_FACE_FLAG_VAR_LSB ) ) point_deltas_x[j] = old_point_delta_x + point_delta_x; else if ( j == ( n_points - 3 ) && !( face->variation_support & TT_FACE_FLAG_VAR_HADVANCE ) ) point_deltas_x[j] = old_point_delta_x + point_delta_x; else if ( j == ( n_points - 2 ) && !( face->variation_support & TT_FACE_FLAG_VAR_TSB ) ) point_deltas_y[j] = old_point_delta_y + point_delta_y; else if ( j == ( n_points - 1 ) && !( face->variation_support & TT_FACE_FLAG_VAR_VADVANCE ) ) point_deltas_y[j] = old_point_delta_y + point_delta_y; } #ifdef FT_DEBUG_LEVEL_TRACE if ( point_delta_x || point_delta_y ) { FT_TRACE7(( " %d: (%f, %f) -> (%f, %f)\n", j, ( FT_intToFixed( outline->points[j].x ) + old_point_delta_x ) / 65536.0, ( FT_intToFixed( outline->points[j].y ) + old_point_delta_y ) / 65536.0, ( FT_intToFixed( outline->points[j].x ) + point_deltas_x[j] ) / 65536.0, ( FT_intToFixed( outline->points[j].y ) + point_deltas_y[j] ) / 65536.0 )); count++; } #endif } #ifdef FT_DEBUG_LEVEL_TRACE if ( !count ) FT_TRACE7(( " none\n" )); #endif } if ( localpoints != ALL_POINTS ) FT_FREE( localpoints ); FT_FREE( deltas_x ); FT_FREE( deltas_y ); offsetToData += tupleDataSize; FT_Stream_SeekSet( stream, here ); } FT_TRACE5(( "\n" )); for ( i = 0; i < n_points; i++ ) { unrounded[i].x += FT_fixedToFdot6( point_deltas_x[i] ); unrounded[i].y += FT_fixedToFdot6( point_deltas_y[i] ); outline->points[i].x += FT_fixedToInt( point_deltas_x[i] ); outline->points[i].y += FT_fixedToInt( point_deltas_y[i] ); } Fail3: FT_FREE( point_deltas_x ); FT_FREE( point_deltas_y ); Fail2: if ( sharedpoints != ALL_POINTS ) FT_FREE( sharedpoints ); FT_FREE( tuple_coords ); FT_FREE( im_start_coords ); FT_FREE( im_end_coords ); FT_FRAME_EXIT(); Fail1: FT_FREE( points_org ); FT_FREE( points_out ); FT_FREE( has_delta ); return error; } /************************************************************************** * * @Function: * tt_get_var_blend * * @Description: * An extended internal version of `TT_Get_MM_Blend' that returns * pointers instead of copying data, without any initialization of * the MM machinery in case it isn't loaded yet. */ FT_LOCAL_DEF( FT_Error ) tt_get_var_blend( TT_Face face, FT_UInt *num_coords, FT_Fixed* *coords, FT_Fixed* *normalizedcoords, FT_MM_Var* *mm_var ) { if ( face->blend ) { if ( num_coords ) *num_coords = face->blend->num_axis; if ( coords ) *coords = face->blend->coords; if ( normalizedcoords ) *normalizedcoords = face->blend->normalizedcoords; if ( mm_var ) *mm_var = face->blend->mmvar; } else { if ( num_coords ) *num_coords = 0; if ( coords ) *coords = NULL; if ( mm_var ) *mm_var = NULL; } return FT_Err_Ok; } static void ft_var_done_item_variation_store( TT_Face face, GX_ItemVarStore itemStore ) { FT_Memory memory = FT_FACE_MEMORY( face ); FT_UInt i; if ( itemStore->varData ) { for ( i = 0; i < itemStore->dataCount; i++ ) { FT_FREE( itemStore->varData[i].regionIndices ); FT_FREE( itemStore->varData[i].deltaSet ); } FT_FREE( itemStore->varData ); } if ( itemStore->varRegionList ) { for ( i = 0; i < itemStore->regionCount; i++ ) FT_FREE( itemStore->varRegionList[i].axisList ); FT_FREE( itemStore->varRegionList ); } } /************************************************************************** * * @Function: * tt_done_blend * * @Description: * Free the blend internal data structure. */ FT_LOCAL_DEF( void ) tt_done_blend( TT_Face face ) { FT_Memory memory = FT_FACE_MEMORY( face ); GX_Blend blend = face->blend; if ( blend ) { FT_UInt i, num_axes; /* blend->num_axis might not be set up yet */ num_axes = blend->mmvar->num_axis; FT_FREE( blend->coords ); FT_FREE( blend->normalizedcoords ); FT_FREE( blend->normalized_stylecoords ); FT_FREE( blend->mmvar ); if ( blend->avar_segment ) { for ( i = 0; i < num_axes; i++ ) FT_FREE( blend->avar_segment[i].correspondence ); FT_FREE( blend->avar_segment ); } if ( blend->hvar_table ) { ft_var_done_item_variation_store( face, &blend->hvar_table->itemStore ); FT_FREE( blend->hvar_table->widthMap.innerIndex ); FT_FREE( blend->hvar_table->widthMap.outerIndex ); FT_FREE( blend->hvar_table ); } if ( blend->vvar_table ) { ft_var_done_item_variation_store( face, &blend->vvar_table->itemStore ); FT_FREE( blend->vvar_table->widthMap.innerIndex ); FT_FREE( blend->vvar_table->widthMap.outerIndex ); FT_FREE( blend->vvar_table ); } if ( blend->mvar_table ) { ft_var_done_item_variation_store( face, &blend->mvar_table->itemStore ); FT_FREE( blend->mvar_table->values ); FT_FREE( blend->mvar_table ); } FT_FREE( blend->tuplecoords ); FT_FREE( blend->glyphoffsets ); FT_FREE( blend ); } } #else /* !TT_CONFIG_OPTION_GX_VAR_SUPPORT */ /* ANSI C doesn't like empty source files */ typedef int _tt_gxvar_dummy; #endif /* !TT_CONFIG_OPTION_GX_VAR_SUPPORT */ /* END */