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freetype/src/truetype/ttgxvar.c
Werner Lemberg 7209110345 * src/truetype/ttgxvar.c (TT_Vary_Apply_Glyph_Deltas): Thinko. 
I should really stop coding late in the evening...

Thanks again to Ben for checking.
2016-12-21 23:46:29 +01:00

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/***************************************************************************/
/* */
/* ttgxvar.c */
/* */
/* TrueType GX Font Variation loader */
/* */
/* Copyright 2004-2016 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 `fvar' is inconsistent. At one point it says */
/* that `countSizePairs' should be 3, at another point 2. It should */
/* be 2. */
/* */
/* The documentation for `gvar' is not intelligible; `cvar' refers you */
/* to `gvar' and is thus also incomprehensible. */
/* */
/* The documentation for `avar' appears correct, but Apple has no fonts */
/* with an `avar' table, so it is hard to test. */
/* */
/* Many thanks to John Jenkins (at Apple) in figuring this out. */
/* */
/* */
/* Apple's `kern' table has some references to tuple indices, but as */
/* there is no indication where these indices are defined, nor how to */
/* interpolate the kerning values (different tuples have different */
/* classes) this issue is ignored. */
/* */
/*************************************************************************/
#include <ft2build.h>
#include FT_INTERNAL_DEBUG_H
#include FT_CONFIG_CONFIG_H
#include FT_INTERNAL_STREAM_H
#include FT_INTERNAL_SFNT_H
#include FT_TRUETYPE_TAGS_H
#include FT_MULTIPLE_MASTERS_H
#include "ttpload.h"
#include "ttgxvar.h"
#include "tterrors.h"
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
#define FT_Stream_FTell( stream ) \
(FT_ULong)( (stream)->cursor - (stream)->base )
#define FT_Stream_SeekSet( stream, off ) \
( (stream)->cursor = (stream)->base + (off) )
/*************************************************************************/
/* */
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_ttgxvar
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** Internal Routines *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* The macro ALL_POINTS is used in `ft_var_readpackedpoints'. It */
/* indicates that there is a delta for every point without needing to */
/* enumerate all of them. */
/* */
/* 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_Short containing the deltas for the affected */
/* points. (This only gets the deltas for one dimension. It will */
/* generally be called twice, once for x, once for y. When used in */
/* cvt table, it will only be called once.) */
/* */
static FT_Short*
ft_var_readpackeddeltas( FT_Stream stream,
FT_ULong size,
FT_UInt delta_cnt )
{
FT_Short *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_GET_SHORT();
}
else
{
/* `runcnt' signed bytes from the stack */
for ( j = 0; j <= cnt && i < delta_cnt; j++ )
deltas[i++] = 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_checked = 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 `cvar'\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++ )
{
/* convert to Fixed */
segment->correspondence[j].fromCoord = FT_GET_SHORT() * 4;
segment->correspondence[j].toCoord = FT_GET_SHORT() * 4;
FT_TRACE5(( " mapping %.4f to %.4f\n",
segment->correspondence[j].fromCoord / 65536.0,
segment->correspondence[j].toCoord / 65536.0 ));
}
FT_TRACE5(( "\n" ));
}
Exit:
FT_FRAME_EXIT();
}
/* some macros we need */
#define FT_FIXED_ONE ( (FT_Fixed)0x10000 )
#define FT_fdot14ToFixed( x ) \
( ( (FT_Fixed)( (FT_Int16)(x) ) ) << 2 )
#define FT_intToFixed( i ) \
( (FT_Fixed)( (FT_UInt32)(i) << 16 ) )
#define FT_fixedToInt( x ) \
( (FT_Short)( ( (FT_UInt32)(x) + 0x8000U ) >> 16 ) )
/*************************************************************************/
/* */
/* <Function> */
/* ft_var_load_hvar */
/* */
/* <Description> */
/* Parse the `HVAR' table and set `blend->hvar_loaded' to TRUE. */
/* */
/* On success, `blend->hvar_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_hvar( TT_Face face )
{
FT_Stream stream = FT_FACE_STREAM( face );
FT_Memory memory = stream->memory;
GX_Blend blend = face->blend;
FT_Error error;
FT_UShort majorVersion;
FT_ULong table_len;
FT_ULong table_offset;
FT_ULong store_offset;
FT_ULong* dataOffsetArray = NULL;
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;
}
/* skip map offset */
if ( FT_READ_ULONG( store_offset ) ||
FT_STREAM_SKIP( 4 ) )
goto Exit;
/* parse item variation store */
{
FT_UShort format;
FT_ULong region_offset;
FT_UInt i, j, k;
FT_UInt shortDeltaCount;
GX_HVStore itemStore;
GX_HVarTable hvarTable;
GX_HVarData hvarData;
if ( FT_STREAM_SEEK( table_offset + store_offset ) ||
FT_READ_USHORT( format ) )
goto Exit;
if ( format != 1 )
{
FT_TRACE2(( "bad store format %d\n", format ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
if ( FT_NEW( blend->hvar_table ) ) /* allocate table at top level */
goto Exit;
hvarTable = blend->hvar_table;
itemStore = &hvarTable->itemStore;
/* read top level fields */
if ( FT_READ_ULONG( region_offset ) ||
FT_READ_USHORT( itemStore->dataCount ) )
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( table_offset + store_offset + region_offset ) )
goto Exit;
if ( FT_READ_USHORT( itemStore->axisCount ) ||
FT_READ_USHORT( itemStore->regionCount ) )
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++ )
{
hvarData = &itemStore->varData[i];
if ( FT_STREAM_SEEK( table_offset +
store_offset +
dataOffsetArray[i] ) )
goto Exit;
if ( FT_READ_USHORT( hvarData->itemCount ) ||
FT_READ_USHORT( shortDeltaCount ) ||
FT_READ_USHORT( hvarData->regionIdxCount ) )
goto Exit;
/* check some data consistency */
if ( shortDeltaCount > hvarData->regionIdxCount )
{
FT_TRACE2(( "bad short count %d or region count %d\n",
shortDeltaCount,
hvarData->regionIdxCount ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
if ( hvarData->regionIdxCount > itemStore->regionCount )
{
FT_TRACE2(( "inconsistent regionCount %d in varData[%d]\n",
hvarData->regionIdxCount,
i ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
/* parse region indices */
if ( FT_NEW_ARRAY( hvarData->regionIndices,
hvarData->regionIdxCount ) )
goto Exit;
for ( j = 0; j < hvarData->regionIdxCount; j++ )
{
if ( FT_READ_USHORT( hvarData->regionIndices[j] ) )
goto Exit;
if ( hvarData->regionIndices[j] >= itemStore->regionCount )
{
FT_TRACE2(( "bad region index %d\n",
hvarData->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( hvarData->deltaSet,
hvarData->regionIdxCount * hvarData->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 < hvarData->itemCount * hvarData->regionIdxCount; )
{
for ( k = 0; k < shortDeltaCount; k++, j++ )
{
/* read the short deltas */
FT_Short delta;
if ( FT_READ_SHORT( delta ) )
goto Exit;
hvarData->deltaSet[j] = delta;
}
for ( ; k < hvarData->regionIdxCount; k++, j++ )
{
/* read the (signed) byte deltas */
FT_Char delta;
if ( FT_READ_CHAR( delta ) )
goto Exit;
hvarData->deltaSet[j] = delta;
}
}
}
}
/* end parse item variation store */
/* parse width map */
{
GX_WidthMap widthMap;
FT_UShort format;
FT_UInt entrySize;
FT_UInt innerBitCount;
FT_UInt innerIndexMask;
FT_UInt i, j;
widthMap = &blend->hvar_table->widthMap;
if ( FT_READ_USHORT( format ) ||
FT_READ_USHORT( widthMap->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( widthMap->innerIndex, widthMap->mapCount ) )
goto Exit;
if ( FT_NEW_ARRAY( widthMap->outerIndex, widthMap->mapCount ) )
goto Exit;
for ( i = 0; i < widthMap->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 >= blend->hvar_table->itemStore.dataCount )
{
FT_TRACE2(( "outerIndex[%d] == %d out of range\n",
i,
outerIndex ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
widthMap->outerIndex[i] = outerIndex;
innerIndex = mapData & innerIndexMask;
if ( innerIndex >=
blend->hvar_table->itemStore.varData[outerIndex].itemCount )
{
FT_TRACE2(( "innerIndex[%d] == %d out of range\n",
i,
innerIndex ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
widthMap->innerIndex[i] = innerIndex;
}
}
/* end parse width map */
FT_TRACE2(( "loaded\n" ));
error = FT_Err_Ok;
Exit:
FT_FREE( dataOffsetArray );
if ( !error )
{
blend->hvar_checked = TRUE;
/* TODO: implement other HVAR stuff */
face->variation_support |= TT_FACE_FLAG_VAR_HADVANCE;
}
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* tt_hadvance_adjust */
/* */
/* <Description> */
/* Apply HVAR advance width adjustment of a given glyph. */
/* */
/* <Input> */
/* gindex :: The glyph index. */
/* */
/* <InOut> */
/* face :: The font face. */
/* */
/* adelta :: Points to width value that gets modified. */
/* */
FT_LOCAL_DEF( FT_Error )
tt_hadvance_adjust( TT_Face face,
FT_UInt gindex,
FT_Int *avalue )
{
FT_Error error = FT_Err_Ok;
GX_HVarData varData;
FT_UInt innerIndex, outerIndex;
FT_UInt master, j;
FT_Fixed netAdjustment = 0; /* accumulated adjustment */
FT_Fixed scaledDelta;
FT_Short* deltaSet;
FT_Fixed delta;
if ( !face->blend )
goto Exit;
if ( !face->blend->hvar_loaded )
{
/* initialize hvar table */
face->blend->hvar_error = ft_var_load_hvar( face );
}
if ( !face->blend->hvar_checked )
{
error = face->blend->hvar_error;
goto Exit;
}
/* advance width adjustments are always present in an `HVAR' table, */
/* so need to test for this capability */
if ( gindex >= face->blend->hvar_table->widthMap.mapCount )
{
FT_TRACE2(( "gindex %d out of range\n", gindex ));
error = FT_THROW( Invalid_Argument );
goto Exit;
}
/* trust that HVAR parser has checked indices */
outerIndex = face->blend->hvar_table->widthMap.outerIndex[gindex];
innerIndex = face->blend->hvar_table->widthMap.innerIndex[gindex];
varData = &face->blend->hvar_table->itemStore.varData[outerIndex];
deltaSet = &varData->deltaSet[varData->regionIdxCount * innerIndex];
/* See pseudo code from `Font Variations Overview' */
/* in the OpenType specification. */
/* outer loop steps through master designs to be blended */
for ( master = 0; master < varData->regionIdxCount; master++ )
{
FT_Fixed scalar = FT_FIXED_ONE;
FT_UInt regionIndex = varData->regionIndices[master];
GX_AxisCoords axis = face->blend
->hvar_table
->itemStore.varRegionList[regionIndex]
.axisList;
/* inner loop steps through axes in this region */
for ( j = 0;
j < face->blend->hvar_table->itemStore.axisCount;
j++, axis++ )
{
FT_Fixed axisScalar;
/* compute the scalar contribution of this axis; */
/* ignore invalid ranges */
if ( axis->startCoord > axis->peakCoord ||
axis->peakCoord > axis->endCoord )
axisScalar = FT_FIXED_ONE;
else if ( axis->startCoord < 0 &&
axis->endCoord > 0 &&
axis->peakCoord != 0 )
axisScalar = FT_FIXED_ONE;
/* peak of 0 means ignore this axis */
else if ( axis->peakCoord == 0 )
axisScalar = FT_FIXED_ONE;
/* ignore this region if coords are out of range */
else if ( face->blend->normalizedcoords[j] < axis->startCoord ||
face->blend->normalizedcoords[j] > axis->endCoord )
axisScalar = 0;
/* calculate a proportional factor */
else
{
if ( face->blend->normalizedcoords[j] == axis->peakCoord )
axisScalar = FT_FIXED_ONE;
else if ( face->blend->normalizedcoords[j] < axis->peakCoord )
axisScalar =
FT_DivFix( face->blend->normalizedcoords[j] - axis->startCoord,
axis->peakCoord - axis->startCoord );
else
axisScalar =
FT_DivFix( axis->endCoord - face->blend->normalizedcoords[j],
axis->endCoord - axis->peakCoord );
}
/* take product of all the axis scalars */
scalar = FT_MulFix( scalar, axisScalar );
} /* per-axis loop */
FT_TRACE4(( ", %f ", scalar / 65536.0 ));
/* 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 */
FT_TRACE4(( "]\n" ));
/* apply the accumulated adjustment to derive the interpolated value */
*avalue += FT_fixedToInt( netAdjustment );
Exit:
return error;
}
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;
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;
}
/* rough sanity check: offsets can be either 2 or 4 bytes, */
/* and a single variation needs at least 4 bytes per glyph */
if ( (FT_ULong)gvar_head.glyphCount *
( ( gvar_head.flags & 1 ) ? 8 : 6 ) > 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;
blend->tuplecount = gvar_head.globalCoordCount;
blend->gv_glyphcnt = gvar_head.glyphCount;
offsetToData = gvar_start + gvar_head.offsetToData;
FT_TRACE5(( "gvar: there are %d shared coordinates:\n",
blend->tuplecount ));
if ( FT_NEW_ARRAY( blend->glyphoffsets, blend->gv_glyphcnt + 1 ) )
goto Exit;
if ( gvar_head.flags & 1 )
{
/* long offsets (one more offset than glyphs, to mark size of last) */
if ( FT_FRAME_ENTER( ( blend->gv_glyphcnt + 1 ) * 4L ) )
goto Exit;
for ( i = 0; i <= blend->gv_glyphcnt; i++ )
blend->glyphoffsets[i] = offsetToData + FT_GET_ULONG();
FT_FRAME_EXIT();
}
else
{
/* short offsets (one more offset than glyphs, to mark size of last) */
if ( FT_FRAME_ENTER( ( blend->gv_glyphcnt + 1 ) * 2L ) )
goto Exit;
for ( i = 0; i <= blend->gv_glyphcnt; i++ )
blend->glyphoffsets[i] = offsetToData + FT_GET_USHORT() * 2;
/* XXX: Undocumented: `*2'! */
FT_FRAME_EXIT();
}
if ( blend->tuplecount != 0 )
{
if ( FT_NEW_ARRAY( blend->tuplecoords,
gvar_head.axisCount * blend->tuplecount ) )
goto Exit;
if ( FT_STREAM_SEEK( gvar_start + gvar_head.offsetToCoord ) ||
FT_FRAME_ENTER( blend->tuplecount * gvar_head.axisCount * 2L ) )
goto Exit;
for ( i = 0; i < blend->tuplecount; i++ )
{
FT_TRACE5(( " [ " ));
for ( j = 0; j < (FT_UInt)gvar_head.axisCount; j++ )
{
blend->tuplecoords[i * gvar_head.axisCount + j] =
FT_GET_SHORT() * 4; /* convert to FT_Fixed */
FT_TRACE5(( "%.4f ",
blend->tuplecoords[i * gvar_head.axisCount + j] / 65536.0 ));
}
FT_TRACE5(( "]\n" ));
}
FT_TRACE5(( "\n" ));
FT_FRAME_EXIT();
}
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* ft_var_apply_tuple */
/* */
/* <Description> */
/* Figure out whether a given tuple (design) applies to the current */
/* blend, and if so, what is the scaling factor. */
/* */
/* <Input> */
/* blend :: The current blend of the font. */
/* */
/* tupleIndex :: A flag saying whether this is an intermediate */
/* tuple or not. */
/* */
/* tuple_coords :: The coordinates of the tuple in normalized axis */
/* units. */
/* */
/* im_start_coords :: The initial coordinates where this tuple starts */
/* to apply (for intermediate coordinates). */
/* */
/* im_end_coords :: The final coordinates after which this tuple no */
/* longer applies (for intermediate coordinates). */
/* */
/* <Return> */
/* An FT_Fixed value containing the scaling factor. */
/* */
static FT_Fixed
ft_var_apply_tuple( GX_Blend blend,
FT_UShort tupleIndex,
FT_Fixed* tuple_coords,
FT_Fixed* im_start_coords,
FT_Fixed* im_end_coords )
{
FT_UInt i;
FT_Fixed apply = 0x10000L;
for ( i = 0; i < blend->num_axis; i++ )
{
FT_TRACE6(( " axis coordinate %d (%.4f):\n",
i, blend->normalizedcoords[i] / 65536.0 ));
if ( !( tupleIndex & GX_TI_INTERMEDIATE_TUPLE ) )
FT_TRACE6(( " intermediate coordinates %d (%.4f, %.4f):\n",
i,
im_start_coords[i] / 65536.0,
im_end_coords[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, ignored\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 value %.4f 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 value %.4f is exceeded, stop\n",
tuple_coords[i] / 65536.0 ));
apply = 0;
break;
}
FT_TRACE6(( " tuple coordinate value %.4f 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 [%.4f;%.4f] is exceeded,"
" stop\n",
im_start_coords[i] / 65536.0,
im_end_coords[i] / 65536.0 ));
apply = 0;
break;
}
else if ( blend->normalizedcoords[i] < tuple_coords[i] )
{
FT_TRACE6(( " intermediate tuple range [%.4f;%.4f] fits\n",
im_start_coords[i] / 65536.0,
im_end_coords[i] / 65536.0 ));
apply = FT_MulDiv( apply,
blend->normalizedcoords[i] - im_start_coords[i],
tuple_coords[i] - im_start_coords[i] );
}
else
{
FT_TRACE6(( " intermediate tuple range [%.4f;%.4f] fits\n",
im_start_coords[i] / 65536.0,
im_end_coords[i] / 65536.0 ));
apply = FT_MulDiv( apply,
im_end_coords[i] - blend->normalizedcoords[i],
im_end_coords[i] - tuple_coords[i] );
}
}
}
FT_TRACE6(( " apply factor is %.4f\n", apply / 65536.0 ));
return apply;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** MULTIPLE MASTERS SERVICE FUNCTIONS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
typedef struct GX_FVar_Head_
{
FT_Long version;
FT_UShort offsetToData;
FT_UShort countSizePairs;
FT_UShort axisCount;
FT_UShort axisSize;
FT_UShort instanceCount;
FT_UShort instanceSize;
} GX_FVar_Head;
typedef struct fvar_axis_
{
FT_ULong axisTag;
FT_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. */
/* */
/* <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;
FT_Int i, j;
FT_MM_Var* mmvar = NULL;
FT_Fixed* next_coords;
FT_String* next_name;
FT_Var_Axis* a;
FT_Var_Named_Style* ns;
GX_FVar_Head fvar_head;
FT_Bool usePsName;
static const FT_Frame_Field fvar_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE GX_FVar_Head
FT_FRAME_START( 16 ),
FT_FRAME_LONG ( version ),
FT_FRAME_USHORT( offsetToData ),
FT_FRAME_USHORT( countSizePairs ),
FT_FRAME_USHORT( axisCount ),
FT_FRAME_USHORT( axisSize ),
FT_FRAME_USHORT( instanceCount ),
FT_FRAME_USHORT( instanceSize ),
FT_FRAME_END
};
static const FT_Frame_Field fvaraxis_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE GX_FVar_Axis
FT_FRAME_START( 20 ),
FT_FRAME_ULONG ( axisTag ),
FT_FRAME_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 */
if ( face->blend == NULL )
{
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(( "number of GX style axes: %d\n", fvar_head.axisCount ));
if ( FT_NEW( face->blend ) )
goto Exit;
/* cannot overflow 32-bit arithmetic because of limits above */
face->blend->mmvar_len =
sizeof ( FT_MM_Var ) +
fvar_head.axisCount * sizeof ( FT_Var_Axis ) +
fvar_head.instanceCount * sizeof ( FT_Var_Named_Style ) +
fvar_head.instanceCount * fvar_head.axisCount * sizeof ( FT_Fixed ) +
5 * fvar_head.axisCount;
if ( FT_ALLOC( mmvar, face->blend->mmvar_len ) )
goto Exit;
face->blend->mmvar = mmvar;
/* set up pointers and offsets into the `mmvar' array; */
/* the data gets filled in later on */
mmvar->num_axis =
fvar_head.axisCount;
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 =
fvar_head.instanceCount;
mmvar->axis =
(FT_Var_Axis*)&( mmvar[1] );
mmvar->namedstyle =
(FT_Var_Named_Style*)&( mmvar->axis[fvar_head.axisCount] );
next_coords =
(FT_Fixed*)&( mmvar->namedstyle[fvar_head.instanceCount] );
for ( i = 0; i < fvar_head.instanceCount; i++ )
{
mmvar->namedstyle[i].coords = next_coords;
next_coords += fvar_head.axisCount;
}
next_name = (FT_String*)next_coords;
for ( i = 0; i < fvar_head.axisCount; i++ )
{
mmvar->axis[i].name = next_name;
next_name += 5;
}
/* now fill in the data */
if ( FT_STREAM_SEEK( fvar_start + fvar_head.offsetToData ) )
goto Exit;
a = mmvar->axis;
for ( i = 0; i < fvar_head.axisCount; i++ )
{
GX_FVar_Axis axis_rec;
if ( FT_STREAM_READ_FIELDS( fvaraxis_fields, &axis_rec ) )
goto Exit;
a->tag = axis_rec.axisTag;
a->minimum = axis_rec.minValue;
a->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';
FT_TRACE5(( " \"%s\": minimum=%.4f, default=%.4f, maximum=%.4f\n",
a->name,
a->minimum / 65536.0,
a->def / 65536.0,
a->maximum / 65536.0 ));
a++;
}
FT_TRACE5(( "\n" ));
ns = mmvar->namedstyle;
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 * fvar_head.axisCount ) )
goto Exit;
ns->strid = FT_GET_USHORT();
(void) /* flags = */ FT_GET_USHORT();
for ( j = 0; j < fvar_head.axisCount; j++ )
ns->coords[j] = FT_GET_LONG();
if ( usePsName )
ns->psid = FT_GET_USHORT();
FT_FRAME_EXIT();
}
}
/* fill the output array if requested */
if ( master != NULL )
{
FT_UInt n;
if ( FT_ALLOC( mmvar, face->blend->mmvar_len ) )
goto Exit;
FT_MEM_COPY( mmvar, face->blend->mmvar, face->blend->mmvar_len );
mmvar->axis =
(FT_Var_Axis*)&( mmvar[1] );
mmvar->namedstyle =
(FT_Var_Named_Style*)&( mmvar->axis[mmvar->num_axis] );
next_coords =
(FT_Fixed*)&( mmvar->namedstyle[mmvar->num_namedstyles] );
for ( n = 0; n < mmvar->num_namedstyles; n++ )
{
mmvar->namedstyle[n].coords = next_coords;
next_coords += mmvar->num_axis;
}
a = mmvar->axis;
next_name = (FT_String*)next_coords;
for ( n = 0; n < mmvar->num_axis; n++ )
{
a->name = next_name;
/* standard PostScript names for some standard apple tags */
if ( a->tag == TTAG_wght )
a->name = (char*)"Weight";
else if ( a->tag == TTAG_wdth )
a->name = (char*)"Width";
else if ( a->tag == TTAG_opsz )
a->name = (char*)"OpticalSize";
else if ( a->tag == TTAG_slnt )
a->name = (char*)"Slant";
next_name += 5;
a++;
}
*master = mmvar;
}
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_Set_MM_Blend */
/* */
/* <Description> */
/* Set the blend (normalized) coordinates for this instance of the */
/* font. Check that the `gvar' table is reasonable and does some */
/* initial preparation. */
/* */
/* <InOut> */
/* face :: The font. */
/* Initialize the blend structure with `gvar' data. */
/* */
/* <Input> */
/* num_coords :: 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 = FT_Err_Ok;
GX_Blend blend;
FT_MM_Var* mmvar;
FT_UInt i;
FT_Bool is_default_instance = 1;
FT_Memory memory = face->root.memory;
enum
{
mcvt_retain,
mcvt_modify,
mcvt_load
} manageCvt;
face->doblend = FALSE;
if ( face->blend == NULL )
{
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(( "normalized design coordinates:\n" ));
for ( i = 0; i < num_coords; i++ )
{
FT_TRACE5(( " %.4f\n", coords[i] / 65536.0 ));
if ( coords[i] < -0x00010000L || coords[i] > 0x00010000L )
{
FT_TRACE1(( "TT_Set_MM_Blend: normalized design coordinate %.4f\n"
" is out of range [-1;1]\n",
coords[i] / 65536.0 ));
error = FT_THROW( Invalid_Argument );
goto Exit;
}
if ( coords[i] != 0 )
is_default_instance = 0;
}
FT_TRACE5(( "\n" ));
if ( !face->isCFF2 && blend->glyphoffsets == NULL )
if ( FT_SET_ERROR( ft_var_load_gvar( face ) ) )
goto Exit;
if ( blend->normalizedcoords == NULL )
{
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
{
manageCvt = mcvt_retain;
for ( i = 0; i < num_coords; i++ )
{
if ( blend->normalizedcoords[i] != coords[i] )
{
manageCvt = mcvt_load;
break;
}
}
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 ) );
face->doblend = TRUE;
if ( face->cvt != NULL )
{
switch ( manageCvt )
{
case mcvt_load:
/* The cvt table has been loaded already; every time we change the */
/* blend we may need to reload and remodify the cvt table. */
FT_FREE( face->cvt );
face->cvt = NULL;
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;
}
}
face->is_default_instance = is_default_instance;
Exit:
return error;
}
/*************************************************************************/
/* */
/* <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 == NULL )
{
if ( FT_SET_ERROR( TT_Get_MM_Var( face, NULL ) ) )
return error;
}
blend = face->blend;
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;
}
for ( i = 0; i < nc; ++i )
coords[i] = blend->normalizedcoords[i];
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;
FT_Fixed* normalized = NULL;
GX_Blend blend;
FT_MM_Var* mmvar;
FT_UInt i, j;
FT_Var_Axis* a;
GX_AVarSegment av;
FT_Memory memory = face->root.memory;
if ( face->blend == NULL )
{
if ( 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;
}
/* Axis normalization is a two stage process. First we normalize */
/* based on the [min,def,max] values for the axis to be [-1,0,1]. */
/* Then, if there's an `avar' table, we renormalize this range. */
if ( FT_NEW_ARRAY( normalized, mmvar->num_axis ) )
goto Exit;
FT_TRACE5(( "design coordinates:\n" ));
a = mmvar->axis;
for ( i = 0; i < num_coords; i++, a++ )
{
FT_Fixed coord = coords[i];
FT_TRACE5(( " %.4f\n", coord / 65536.0 ));
if ( coord > a->maximum || coord < a->minimum )
{
FT_TRACE1((
"TT_Set_Var_Design: normalized design coordinate %.4f\n"
" is out of range [%.4f;%.4f]; 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( coords[i] - a->def,
a->minimum - a->def );
else if ( coord > a->def )
normalized[i] = FT_DivFix( coords[i] - a->def,
a->maximum - a->def );
else
normalized[i] = 0;
}
FT_TRACE5(( "\n" ));
for ( ; i < mmvar->num_axis; i++ )
normalized[i] = 0;
if ( !blend->avar_checked )
ft_var_load_avar( face );
if ( blend->avar_segment != NULL )
{
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++ )
{
FT_TRACE5(( " %.4f\n", normalized[i] / 65536.0 ));
if ( normalized[i] < av->correspondence[j].fromCoord )
{
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;
}
}
}
}
error = TT_Set_MM_Blend( face, mmvar->num_axis, normalized );
Exit:
FT_FREE( normalized );
return error;
}
FT_LOCAL_DEF( FT_Error )
TT_Get_Var_Design( TT_Face face,
FT_UInt num_coords,
FT_Fixed* coords )
{
FT_UNUSED( face );
FT_UNUSED( num_coords );
FT_UNUSED( coords );
/* TODO: Implement this function. */
return FT_THROW( Unimplemented_Feature );
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GX VAR PARSING ROUTINES *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_vary_cvt */
/* */
/* <Description> */
/* Modify the loaded cvt table according to the `cvar' table and the */
/* font's blend. */
/* */
/* <InOut> */
/* face :: A handle to the target face object. */
/* */
/* <Input> */
/* stream :: A handle to the input stream. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* Most errors are ignored. It is perfectly valid not to have a */
/* `cvar' table even if there is a `gvar' and `fvar' table. */
/* */
FT_LOCAL_DEF( FT_Error )
tt_face_vary_cvt( TT_Face face,
FT_Stream stream )
{
FT_Error error;
FT_Memory memory = stream->memory;
FT_ULong table_start;
FT_ULong table_len;
FT_UInt tupleCount;
FT_ULong offsetToData;
FT_ULong here;
FT_UInt i, j;
FT_Fixed* tuple_coords = NULL;
FT_Fixed* im_start_coords = NULL;
FT_Fixed* im_end_coords = NULL;
GX_Blend blend = face->blend;
FT_UInt point_count;
FT_UShort* localpoints;
FT_Short* deltas;
FT_TRACE2(( "CVAR " ));
if ( blend == NULL )
{
FT_TRACE2(( "\n"
"tt_face_vary_cvt: no blend specified\n" ));
error = FT_Err_Ok;
goto Exit;
}
if ( face->cvt == NULL )
{
FT_TRACE2(( "\n"
"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;
/* The documentation implies there are flags packed into */
/* `tupleCount', but John Jenkins says that shared points don't apply */
/* to `cvar', and no other flags are defined. */
FT_TRACE5(( "cvar: there are %d tuples:\n", tupleCount & 0xFFF ));
for ( i = 0; i < ( tupleCount & 0xFFF ); i++ )
{
FT_UInt tupleDataSize;
FT_UInt tupleIndex;
FT_Fixed apply;
FT_TRACE6(( " tuple %d:\n", i ));
tupleDataSize = FT_GET_USHORT();
tupleIndex = FT_GET_USHORT();
/* There is no provision here for a global tuple coordinate section, */
/* so John says. There are no tuple indices, just embedded tuples. */
if ( tupleIndex & GX_TI_EMBEDDED_TUPLE_COORD )
{
for ( j = 0; j < blend->num_axis; j++ )
tuple_coords[j] = FT_GET_SHORT() * 4; /* convert from */
/* short frac to fixed */
}
else
{
/* skip this tuple; it makes no sense */
if ( tupleIndex & GX_TI_INTERMEDIATE_TUPLE )
for ( j = 0; j < 2 * blend->num_axis; j++ )
(void)FT_GET_SHORT();
offsetToData += tupleDataSize;
continue;
}
if ( tupleIndex & GX_TI_INTERMEDIATE_TUPLE )
{
for ( j = 0; j < blend->num_axis; j++ )
im_start_coords[j] = FT_GET_SHORT() * 4;
for ( j = 0; j < blend->num_axis; j++ )
im_end_coords[j] = FT_GET_SHORT() * 4;
}
apply = ft_var_apply_tuple( blend,
(FT_UShort)tupleIndex,
tuple_coords,
im_start_coords,
im_end_coords );
if ( /* tuple isn't active for our blend */
apply == 0 ||
/* global points not allowed, */
/* if they aren't local, makes no sense */
!( tupleIndex & GX_TI_PRIVATE_POINT_NUMBERS ) )
{
offsetToData += tupleDataSize;
continue;
}
here = FT_Stream_FTell( stream );
FT_Stream_SeekSet( stream, offsetToData );
localpoints = ft_var_readpackedpoints( stream,
table_len,
&point_count );
deltas = ft_var_readpackeddeltas( stream,
table_len,
point_count == 0 ? face->cvt_size
: point_count );
if ( localpoints == NULL || deltas == NULL )
; /* 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_Long orig_cvt = face->cvt[j];
face->cvt[j] = (FT_Short)( orig_cvt +
FT_MulFix( deltas[j], apply ) );
#ifdef FT_DEBUG_LEVEL_TRACE
if ( orig_cvt != face->cvt[j] )
{
FT_TRACE7(( " %d: %d -> %d\n",
j, orig_cvt, face->cvt[j] ));
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_Long orig_cvt;
pindex = localpoints[j];
if ( (FT_ULong)pindex >= face->cvt_size )
continue;
orig_cvt = face->cvt[pindex];
face->cvt[pindex] = (FT_Short)( orig_cvt +
FT_MulFix( deltas[j], apply ) );
#ifdef FT_DEBUG_LEVEL_TRACE
if ( orig_cvt != face->cvt[pindex] )
{
FT_TRACE7(( " %d: %d -> %d\n",
pindex, orig_cvt, face->cvt[pindex] ));
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" ));
FExit:
FT_FRAME_EXIT();
Exit:
FT_FREE( tuple_coords );
FT_FREE( im_start_coords );
FT_FREE( im_end_coords );
return error;
}
/* 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' */
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 ( out1 == out2 || in1 == in2 )
{
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;
out_points[p].x = out;
}
}
else
{
FT_Fixed scale = FT_DivFix( out2 - out1, in2 - in1 );
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. */
/* */
/* <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_UInt n_points )
{
FT_Stream stream = face->root.stream;
FT_Memory memory = stream->memory;
GX_Blend blend = face->blend;
FT_Vector* points_org = NULL;
FT_Vector* points_out = NULL;
FT_Bool* has_delta = NULL;
FT_Error error;
FT_ULong glyph_start;
FT_UInt tupleCount;
FT_ULong offsetToData;
FT_ULong here;
FT_UInt i, j;
FT_Fixed* tuple_coords = NULL;
FT_Fixed* im_start_coords = NULL;
FT_Fixed* im_end_coords = NULL;
FT_UInt point_count, spoint_count = 0;
FT_UShort* sharedpoints = NULL;
FT_UShort* localpoints = NULL;
FT_UShort* points;
FT_Short *deltas_x, *deltas_y;
if ( !face->doblend || blend == NULL )
return FT_THROW( Invalid_Argument );
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 this glyph\n" ));
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;
if ( FT_STREAM_SEEK( blend->glyphoffsets[glyph_index] ) ||
FT_FRAME_ENTER( blend->glyphoffsets[glyph_index + 1] -
blend->glyphoffsets[glyph_index] ) )
goto Fail1;
glyph_start = FT_Stream_FTell( stream );
/* each set of glyph variation data is formatted similarly to `cvar' */
/* (except we get shared points and global tuples) */
if ( FT_NEW_ARRAY( tuple_coords, blend->num_axis ) ||
FT_NEW_ARRAY( im_start_coords, blend->num_axis ) ||
FT_NEW_ARRAY( im_end_coords, blend->num_axis ) )
goto Fail2;
tupleCount = FT_GET_USHORT();
offsetToData = FT_GET_USHORT();
/* rough sanity test */
if ( offsetToData + ( tupleCount & GX_TC_TUPLE_COUNT_MASK ) * 4 >
blend->gvar_size )
{
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 are %d tuples:\n",
tupleCount & GX_TC_TUPLE_COUNT_MASK ));
for ( j = 0; j < n_points; j++ )
points_org[j] = outline->points[j];
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_GET_SHORT() * 4; /* convert from */
/* short frac to fixed */
}
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 Fail2;
}
else
FT_MEM_COPY(
tuple_coords,
&blend->tuplecoords[( tupleIndex & 0xFFF ) * blend->num_axis],
blend->num_axis * sizeof ( FT_Fixed ) );
if ( tupleIndex & GX_TI_INTERMEDIATE_TUPLE )
{
for ( j = 0; j < blend->num_axis; j++ )
im_start_coords[j] = FT_GET_SHORT() * 4;
for ( j = 0; j < blend->num_axis; j++ )
im_end_coords[j] = FT_GET_SHORT() * 4;
}
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 == NULL || deltas_y == NULL || deltas_x == NULL )
; /* 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_Pos delta_x = FT_MulFix( deltas_x[j], apply );
FT_Pos delta_y = FT_MulFix( deltas_y[j], apply );
if ( j < n_points - 3 )
{
outline->points[j].x += delta_x;
outline->points[j].y += 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 - 3 ) &&
!( face->variation_support &
TT_FACE_FLAG_VAR_HADVANCE ) )
outline->points[j].x += delta_x;
else if ( j == ( n_points - 2 ) &&
!( face->variation_support &
TT_FACE_FLAG_VAR_LSB ) )
outline->points[j].x += delta_x;
else if ( j == ( n_points - 1 ) &&
!( face->variation_support &
TT_FACE_FLAG_VAR_VADVANCE ) )
outline->points[j].y += delta_y;
else if ( j == ( n_points - 0 ) &&
!( face->variation_support &
TT_FACE_FLAG_VAR_TSB ) )
outline->points[j].y += delta_y;
}
#ifdef FT_DEBUG_LEVEL_TRACE
if ( delta_x || delta_y )
{
FT_TRACE7(( " %d: (%d, %d) -> (%d, %d)\n",
j,
outline->points[j].x - delta_x,
outline->points[j].y - delta_y,
outline->points[j].x,
outline->points[j].y ));
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_Pos delta_x = points_out[j].x - points_org[j].x;
FT_Pos delta_y = points_out[j].y - points_org[j].y;
outline->points[j].x += delta_x;
outline->points[j].y += delta_y;
#ifdef FT_DEBUG_LEVEL_TRACE
if ( delta_x || delta_y )
{
FT_TRACE7(( " %d: (%d, %d) -> (%d, %d)\n",
j,
outline->points[j].x - delta_x,
outline->points[j].y - delta_y,
outline->points[j].x,
outline->points[j].y ));
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" ));
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_MM_Var* *mm_var )
{
if ( face->blend )
{
if ( num_coords )
*num_coords = face->blend->num_axis;
if ( coords )
*coords = 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;
}
/*************************************************************************/
/* */
/* <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 != NULL )
{
FT_UInt i, num_axes;
/* blend->num_axis might not be set up yet */
num_axes = blend->mmvar->num_axis;
FT_FREE( blend->normalizedcoords );
FT_FREE( blend->mmvar );
if ( blend->avar_segment != NULL )
{
for ( i = 0; i < num_axes; i++ )
FT_FREE( blend->avar_segment[i].correspondence );
FT_FREE( blend->avar_segment );
}
if ( blend->hvar_table != NULL )
{
if ( blend->hvar_table->itemStore.varData )
{
for ( i = 0; i < blend->hvar_table->itemStore.dataCount; i++ )
{
FT_FREE( blend->hvar_table->itemStore.varData[i].regionIndices );
FT_FREE( blend->hvar_table->itemStore.varData[i].deltaSet );
}
FT_FREE( blend->hvar_table->itemStore.varData );
}
if ( blend->hvar_table->itemStore.varRegionList )
{
for ( i = 0; i < blend->hvar_table->itemStore.regionCount; i++ )
FT_FREE( blend->hvar_table->itemStore.varRegionList[i].axisList );
FT_FREE( blend->hvar_table->itemStore.varRegionList );
}
FT_FREE( blend->hvar_table->widthMap.innerIndex );
FT_FREE( blend->hvar_table->widthMap.outerIndex );
FT_FREE( blend->hvar_table );
}
FT_FREE( blend->tuplecoords );
FT_FREE( blend->glyphoffsets );
FT_FREE( blend );
}
}
#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
/* END */
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