blob: 22c7025f535b3810856a513c05d478b9bd1fc5b6 [file] [log] [blame]
/****************************************************************************
*
* ttgxvar.c
*
* TrueType GX Font Variation loader
*
* Copyright (C) 2004-2020 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 = FT_Err_Ok;
FT_UNUSED( 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_NEW_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_Memory memory = stream->memory;
FT_Error error = FT_Err_Ok;
FT_UNUSED( error );
if ( delta_cnt > size )
{
FT_TRACE1(( "ft_var_readpackeddeltas: number of points too large\n" ));
return NULL;
}
if ( FT_NEW_ARRAY( deltas, delta_cnt ) )
return NULL;
i = 0;
while ( i < delta_cnt )
{
runcnt = FT_GET_BYTE();
cnt = runcnt & GX_DT_DELTA_RUN_COUNT_MASK;
if ( runcnt & GX_DT_DELTAS_ARE_ZERO )
{
/* `runcnt' zeroes get added */
for ( j = 0; j <= cnt && i < delta_cnt; j++ )
deltas[i++] = 0;
}
else if ( runcnt & GX_DT_DELTAS_ARE_WORDS )
{
/* `runcnt' shorts from the stack */
for ( j = 0; j <= cnt && i < delta_cnt; j++ )
deltas[i++] = FT_intToFixed( FT_GET_SHORT() );
}
else
{
/* `runcnt' signed bytes from the stack */
for ( j = 0; j <= cnt && i < delta_cnt; j++ )
deltas[i++] = FT_intToFixed( FT_GET_CHAR() );
}
if ( j <= cnt )
{
/* 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 = FT_Err_Ok;
FT_Long version;
FT_Long axisCount;
FT_Int i, j;
FT_ULong table_len;
FT_UNUSED( error );
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"
" table are different\n" ));
goto Exit;
}
if ( FT_NEW_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_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_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 shortDeltaCount;
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_NEW_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"
" "
" and `fvar' table are different\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( shortDeltaCount ) ||
FT_READ_USHORT( varData->regionIdxCount ) )
goto Exit;
/* check some data consistency */
if ( shortDeltaCount > varData->regionIdxCount )
{
FT_TRACE2(( "bad short count %d or region count %d\n",
shortDeltaCount,
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 (shortDeltaCount + regionIdxCount) bytes */
/* each; 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; */
/* sign-extend signed bytes to signed shorts */
for ( j = 0; j < varData->itemCount * varData->regionIdxCount; )
{
for ( k = 0; k < shortDeltaCount; 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_Stream stream = FT_FACE_STREAM( face );
FT_Memory memory = stream->memory;
FT_Error error;
FT_UShort format;
FT_UInt entrySize;
FT_UInt innerBitCount;
FT_UInt innerIndexMask;
FT_UInt i, j;
if ( FT_STREAM_SEEK( offset ) ||
FT_READ_USHORT( format ) ||
FT_READ_USHORT( map->mapCount ) )
goto Exit;
if ( format & 0xFFC0 )
{
FT_TRACE2(( "bad map format %d\n", format ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
/* bytes per entry: 1, 2, 3, or 4 */
entrySize = ( ( format & 0x0030 ) >> 4 ) + 1;
innerBitCount = ( format & 0x000F ) + 1;
innerIndexMask = ( 1 << innerBitCount ) - 1;
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[%d] == %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[%d] == %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 );
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"
" 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_NEW_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_NEW_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", i ));
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"
" is out of range [%.5f;%.5f]; clamping\n",
coord / 65536.0,
a->minimum / 65536.0,
a->maximum / 65536.0 ));
if ( coord > a->maximum )
coord = a->maximum;
else
coord = a->minimum;
}
if ( coord < a->def )
normalized[i] = -FT_DivFix( SUB_LONG( coord, a->def ),
SUB_LONG( a->minimum, a->def ) );
else if ( coord > a->def )
normalized[i] = FT_DivFix( SUB_LONG( coord, a->def ),
SUB_LONG( a->maximum, a->def ) );
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;
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"
"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"
" 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"
" is out of range [-1;1]\n",
coords[i] / 65536.0 ));
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;
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 );
face->cvt = NULL;
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 );
face->postscript_name = NULL;
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;