mirror of https://github.com/freetype/freetype
[truetype] Add `HVAR' table parsing.
Note that this is not complete yet; it only handles advance width variation. Activation of the code follows in another commit. * include/freetype/ftmm.h (FT_Var_Named_Style): Add `psid' member. * src/truetype/ttgxvar.h (GX_HVarData, GX_AxisCoords, GX_HVarRegion, GX_HVStore, GX_WidthMap): New auxiliary structures for... (GX_HVarTable): ... HVAR main structure. (GX_BlendRec): Add data for HVAR loading. * src/truetype/ttgxvar.c (FT_FIXED_ONE, FT_fdot14ToFixed, FT_intToFixed, FT_fixedToInt): New macros. (ft_var_load_hvar): New function. (TT_Get_MM_Var): Updated. (tt_done_blend): Deallocate HVAR data.
This commit is contained in:
Dave Arnold
Werner Lemberg
parent
abd5858102
commit
097cd874ee
23
ChangeLog
23
ChangeLog
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@ -1,3 +1,26 @@
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2016-12-15 Dave Arnold <darnold@adobe.com>
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Werner Lemberg <wl@gnu.org>
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[truetype] Add `HVAR' table parsing.
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Note that this is not complete yet; it only handles advance width
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variation.
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Activation of the code follows in another commit.
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* include/freetype/ftmm.h (FT_Var_Named_Style): Add `psid' member.
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* src/truetype/ttgxvar.h (GX_HVarData, GX_AxisCoords, GX_HVarRegion,
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GX_HVStore, GX_WidthMap): New auxiliary structures for...
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(GX_HVarTable): ... HVAR main structure.
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(GX_BlendRec): Add data for HVAR loading.
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* src/truetype/ttgxvar.c (FT_FIXED_ONE, FT_fdot14ToFixed,
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FT_intToFixed, FT_fixedToInt): New macros.
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(ft_var_load_hvar): New function.
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(TT_Get_MM_Var): Updated.
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(tt_done_blend): Deallocate HVAR data.
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2016-12-15 Dave Arnold <darnold@adobe.com>
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[cff] Extend number parsing.
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@ -171,6 +171,7 @@ FT_BEGIN_HEADER
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{
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FT_Fixed* coords;
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FT_UInt strid;
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FT_UInt psid; /* since 2.7.1 */
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} FT_Var_Named_Style;
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@ -393,6 +393,361 @@
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}
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/* some macros we need */
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#define FT_FIXED_ONE ( (FT_Fixed)0x10000 )
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#define FT_fdot14ToFixed( x ) \
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( ( (FT_Fixed)( (FT_Int16)(x) ) ) << 2 )
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#define FT_intToFixed( i ) \
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( (FT_Fixed)( (FT_UInt32)(i) << 16 ) )
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#define FT_fixedToInt( x ) \
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( (FT_Short)( ( (FT_UInt32)(x) + 0x8000U ) >> 16 ) )
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/*************************************************************************/
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/* */
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/* <Function> */
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/* ft_var_load_hvar */
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/* */
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/* <Description> */
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/* Parse the `HVAR' table and set `blend->hvar_loaded' to TRUE. */
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/* */
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/* On success, `blend->hvar_checked' is set to TRUE. */
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/* */
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/* Some memory may remain allocated on error; it is always freed in */
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/* `tt_done_blend', however. */
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/* */
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/* <InOut> */
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/* face :: The font face. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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static FT_Error
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ft_var_load_hvar( TT_Face face )
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{
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FT_Stream stream = FT_FACE_STREAM( face );
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FT_Memory memory = stream->memory;
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GX_Blend blend = face->blend;
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FT_Error error;
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FT_UShort majorVersion;
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FT_UShort minorVersion;
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FT_ULong table_len;
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FT_ULong table_offset;
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FT_ULong store_offset;
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FT_ULong map_offset;
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FT_ULong* dataOffsetArray = NULL;
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blend->hvar_loaded = TRUE;
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FT_TRACE2(( "HVAR " ));
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error = face->goto_table( face, TTAG_HVAR, stream, &table_len );
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if ( error )
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{
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FT_TRACE2(( "is missing\n" ));
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goto Exit;
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}
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table_offset = FT_STREAM_POS();
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if ( FT_READ_USHORT( majorVersion ) ||
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FT_READ_USHORT( minorVersion ) )
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goto Exit;
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if ( majorVersion != 1 )
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{
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FT_TRACE2(( "bad table version %d\n", majorVersion ));
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error = FT_THROW( Invalid_Table );
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goto Exit;
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}
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if ( FT_READ_ULONG( store_offset ) ||
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FT_READ_ULONG( map_offset ) )
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goto Exit;
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/* parse item variation store */
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{
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FT_UShort format;
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FT_ULong region_offset;
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FT_UInt i, j, k;
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FT_UInt shortDeltaCount;
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GX_HVStore itemStore;
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GX_HVarTable hvarTable;
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GX_HVarData hvarData;
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if ( FT_STREAM_SEEK( table_offset + store_offset ) ||
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FT_READ_USHORT( format ) )
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goto Exit;
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if ( format != 1 )
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{
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FT_TRACE2(( "bad store format %d\n", format ));
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error = FT_THROW( Invalid_Table );
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goto Exit;
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}
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if ( FT_NEW( blend->hvar_table ) ) /* allocate table at top level */
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goto Exit;
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hvarTable = blend->hvar_table;
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itemStore = &hvarTable->itemStore;
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/* read top level fields */
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if ( FT_READ_ULONG( region_offset ) ||
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FT_READ_USHORT( itemStore->dataCount ) )
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goto Exit;
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/* make temporary copy of item variation data offsets; */
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/* we will parse region list first, then come back */
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if ( FT_NEW_ARRAY( dataOffsetArray, itemStore->dataCount ) )
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goto Exit;
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for ( i = 0; i < itemStore->dataCount; i++ )
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{
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if ( FT_READ_ULONG( dataOffsetArray[i] ) )
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goto Exit;
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}
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/* parse array of region records (region list) */
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if ( FT_STREAM_SEEK( table_offset + store_offset + region_offset ) )
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goto Exit;
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if ( FT_READ_USHORT( itemStore->axisCount ) ||
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FT_READ_USHORT( itemStore->regionCount ) )
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goto Exit;
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if ( FT_NEW_ARRAY( itemStore->varRegionList, itemStore->regionCount ) )
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goto Exit;
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for ( i = 0; i < itemStore->regionCount; i++ )
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{
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GX_AxisCoords axisCoords;
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if ( FT_NEW_ARRAY( itemStore->varRegionList[i].axisList,
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itemStore->axisCount ) )
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goto Exit;
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axisCoords = itemStore->varRegionList[i].axisList;
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for ( j = 0; j < itemStore->axisCount; j++ )
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{
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FT_Short start, peak, end;
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if ( FT_READ_SHORT( start ) ||
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FT_READ_SHORT( peak ) ||
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FT_READ_SHORT( end ) )
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goto Exit;
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axisCoords[j].startCoord = FT_fdot14ToFixed( start );
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axisCoords[j].peakCoord = FT_fdot14ToFixed( peak );
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axisCoords[j].endCoord = FT_fdot14ToFixed( end );
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}
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}
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/* end of region list parse */
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/* use dataOffsetArray now to parse varData items */
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if ( FT_NEW_ARRAY( itemStore->varData, itemStore->dataCount ) )
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goto Exit;
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for ( i = 0; i < itemStore->dataCount; i++ )
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{
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hvarData = &itemStore->varData[i];
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if ( FT_STREAM_SEEK( table_offset +
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store_offset +
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dataOffsetArray[i] ) )
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goto Exit;
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if ( FT_READ_USHORT( hvarData->itemCount ) ||
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FT_READ_USHORT( shortDeltaCount ) ||
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FT_READ_USHORT( hvarData->regionIdxCount ) )
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goto Exit;
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/* check some data consistency */
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if ( shortDeltaCount > hvarData->regionIdxCount )
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{
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FT_TRACE2(( "bad short count %d or region count %d\n",
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shortDeltaCount,
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hvarData->regionIdxCount ));
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error = FT_THROW( Invalid_Table );
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goto Exit;
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}
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if ( hvarData->regionIdxCount > itemStore->regionCount )
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{
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FT_TRACE2(( "inconsistent regionCount %d in varData[%d]\n",
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hvarData->regionIdxCount,
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i ));
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error = FT_THROW( Invalid_Table );
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goto Exit;
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}
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/* parse region indices */
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if ( FT_NEW_ARRAY( hvarData->regionIndices,
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hvarData->regionIdxCount ) )
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goto Exit;
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for ( j = 0; j < hvarData->regionIdxCount; j++ )
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{
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if ( FT_READ_USHORT( hvarData->regionIndices[j] ) )
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goto Exit;
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if ( hvarData->regionIndices[j] >= itemStore->regionCount )
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{
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FT_TRACE2(( "bad region index %d\n",
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hvarData->regionIndices[j] ));
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error = FT_THROW( Invalid_Table );
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goto Exit;
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}
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}
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/* Parse delta set. */
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/* */
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/* On input, deltas are ( shortDeltaCount + regionIdxCount ) bytes */
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/* each; on output, deltas are expanded to `regionIdxCount' shorts */
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/* each. */
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if ( FT_NEW_ARRAY( hvarData->deltaSet,
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hvarData->regionIdxCount * hvarData->itemCount ) )
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goto Exit;
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/* the delta set is stored as a 2-dimensional array of shorts; */
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/* sign-extend signed bytes to signed shorts */
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for ( j = 0; j < hvarData->itemCount * hvarData->regionIdxCount; )
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{
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for ( k = 0; k < shortDeltaCount; k++, j++ )
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{
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/* read the short deltas */
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FT_Short delta;
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if ( FT_READ_SHORT( delta ) )
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goto Exit;
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hvarData->deltaSet[j] = delta;
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}
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for ( ; k < hvarData->regionIdxCount; k++, j++ )
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{
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/* read the (signed) byte deltas */
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FT_Char delta;
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if ( FT_READ_CHAR( delta ) )
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goto Exit;
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hvarData->deltaSet[j] = delta;
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}
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}
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}
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}
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/* end parse item variation store */
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/* parse width map */
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{
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GX_WidthMap widthMap;
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FT_UShort format;
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FT_UInt entrySize;
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FT_UInt innerBitCount;
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FT_UInt innerIndexMask;
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FT_UInt i, j;
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widthMap = &blend->hvar_table->widthMap;
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if ( FT_READ_USHORT( format ) ||
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FT_READ_USHORT( widthMap->mapCount ) )
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goto Exit;
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if ( format & 0xFFC0 )
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{
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FT_TRACE2(( "bad map format %d\n", format ));
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error = FT_THROW( Invalid_Table );
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goto Exit;
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}
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/* bytes per entry: 1, 2, 3, or 4 */
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entrySize = ( ( format & 0x0030 ) >> 4 ) + 1;
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innerBitCount = ( format & 0x000F ) + 1;
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innerIndexMask = ( 1 << innerBitCount ) - 1;
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if ( FT_NEW_ARRAY( widthMap->innerIndex, widthMap->mapCount ) )
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goto Exit;
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if ( FT_NEW_ARRAY( widthMap->outerIndex, widthMap->mapCount ) )
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goto Exit;
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for ( i = 0; i < widthMap->mapCount; i++ )
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{
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FT_UInt mapData = 0;
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FT_UInt outerIndex, innerIndex;
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/* read map data one unsigned byte at a time, big endian */
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for ( j = 0; j < entrySize; j++ )
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{
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FT_Byte data;
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if ( FT_READ_BYTE( data ) )
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goto Exit;
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mapData = ( mapData << 8 ) | data;
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}
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outerIndex = mapData >> innerBitCount;
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if ( outerIndex >= blend->hvar_table->itemStore.dataCount )
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{
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FT_TRACE2(( "outerIndex[%d] == %d out of range\n",
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i,
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outerIndex ));
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error = FT_THROW( Invalid_Table );
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goto Exit;
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}
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widthMap->outerIndex[i] = outerIndex;
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innerIndex = mapData & innerIndexMask;
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if ( innerIndex >=
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blend->hvar_table->itemStore.varData[outerIndex].itemCount )
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{
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FT_TRACE2(( "innerIndex[%d] == %d out of range\n",
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i,
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innerIndex ));
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error = FT_THROW( Invalid_Table );
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goto Exit;
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}
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widthMap->innerIndex[i] = innerIndex;
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}
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}
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/* end parse width map */
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FT_TRACE2(( "loaded\n" ));
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error = FT_Err_Ok;
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Exit:
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FT_FREE( dataOffsetArray );
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if ( !error )
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blend->hvar_checked = TRUE;
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return error;
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}
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typedef struct GX_GVar_Head_
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{
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FT_Long version;
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@ -778,6 +1133,7 @@
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FT_Var_Axis* a;
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FT_Var_Named_Style* ns;
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GX_FVar_Head fvar_head;
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FT_Bool usePsName;
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static const FT_Frame_Field fvar_fields[] =
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{
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|
@ -851,8 +1207,6 @@
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fvar_head.axisSize != 20 ||
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/* axisCount limit implied by 16-bit instanceSize */
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fvar_head.axisCount > 0x3FFE ||
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fvar_head.instanceSize != 4 + 4 * fvar_head.axisCount ||
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/* instanceCount limit implied by limited range of name IDs */
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fvar_head.instanceCount > 0x7EFF ||
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fvar_head.offsetToData + fvar_head.axisCount * 20U +
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fvar_head.instanceCount * fvar_head.instanceSize > table_len )
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|
|
@ -863,6 +1217,18 @@
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goto Exit;
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}
|
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|
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if ( fvar_head.instanceSize == 4 + 4 * fvar_head.axisCount )
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usePsName = FALSE;
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else if ( fvar_head.instanceSize == 6 + 4 * fvar_head.axisCount )
|
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usePsName = TRUE;
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else
|
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{
|
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FT_TRACE1(( "\n"
|
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"TT_Get_MM_Var: invalid `fvar' header\n" ));
|
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error = FT_THROW( Invalid_Table );
|
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goto Exit;
|
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}
|
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|
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FT_TRACE2(( "loaded\n" ));
|
||||
|
||||
FT_TRACE5(( "number of GX style axes: %d\n", fvar_head.axisCount ));
|
||||
|
|
@ -952,7 +1318,9 @@
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ns = mmvar->namedstyle;
|
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for ( i = 0; i < fvar_head.instanceCount; i++, ns++ )
|
||||
{
|
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if ( FT_FRAME_ENTER( 4L + 4L * fvar_head.axisCount ) )
|
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/* PostScript names add 2 bytes to the instance record size */
|
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if ( FT_FRAME_ENTER( ( usePsName ? 6L : 4L ) +
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4L * fvar_head.axisCount ) )
|
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goto Exit;
|
||||
|
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ns->strid = FT_GET_USHORT();
|
||||
|
|
@ -961,6 +1329,9 @@
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for ( j = 0; j < fvar_head.axisCount; j++ )
|
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ns->coords[j] = FT_GET_LONG();
|
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|
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if ( usePsName )
|
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ns->psid = FT_GET_USHORT();
|
||||
|
||||
FT_FRAME_EXIT();
|
||||
}
|
||||
}
|
||||
|
|
@ -2296,6 +2667,30 @@
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FT_FREE( blend->avar_segment );
|
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}
|
||||
|
||||
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 );
|
||||
|
|
|
|||
|
|
@ -61,6 +61,77 @@ FT_BEGIN_HEADER
|
|||
} GX_AVarSegmentRec, *GX_AVarSegment;
|
||||
|
||||
|
||||
typedef struct GX_HVarDataRec_
|
||||
{
|
||||
FT_UInt itemCount; /* number of delta sets per item */
|
||||
FT_UInt regionIdxCount; /* number of region indices in this data */
|
||||
FT_UInt* regionIndices; /* array of `regionCount' indices; */
|
||||
/* these index `varRegionList' */
|
||||
FT_Short* deltaSet; /* array of `itemCount' deltas */
|
||||
/* use `innerIndex' for this array */
|
||||
|
||||
} GX_HVarDataRec, *GX_HVarData;
|
||||
|
||||
|
||||
/* contribution of one axis to a region */
|
||||
typedef struct GX_AxisCoordsRec_
|
||||
{
|
||||
FT_Fixed startCoord;
|
||||
FT_Fixed peakCoord; /* zero means no effect (factor = 1) */
|
||||
FT_Fixed endCoord;
|
||||
|
||||
} GX_AxisCoordsRec, *GX_AxisCoords;
|
||||
|
||||
|
||||
typedef struct GX_HVarRegionRec_
|
||||
{
|
||||
GX_AxisCoords axisList; /* array of axisCount records */
|
||||
|
||||
} GX_HVarRegionRec, *GX_HVarRegion;
|
||||
|
||||
|
||||
/* HVAR item variation store */
|
||||
typedef struct GX_HVStoreRec_
|
||||
{
|
||||
FT_UInt dataCount;
|
||||
GX_HVarData varData; /* array of dataCount records; */
|
||||
/* use `outerIndex' for this array */
|
||||
FT_UShort axisCount;
|
||||
FT_UInt regionCount; /* total number of regions defined */
|
||||
GX_HVarRegion varRegionList;
|
||||
|
||||
} GX_HVStoreRec, *GX_HVStore;
|
||||
|
||||
|
||||
typedef struct GX_WidthMapRec_
|
||||
{
|
||||
FT_UInt mapCount;
|
||||
FT_UInt* outerIndex; /* indices to item var data */
|
||||
FT_UInt* innerIndex; /* indices to delta set */
|
||||
|
||||
} GX_WidthMapRec, *GX_WidthMap;
|
||||
|
||||
|
||||
/*************************************************************************/
|
||||
/* */
|
||||
/* <Struct> */
|
||||
/* GX_HVarTableRec */
|
||||
/* */
|
||||
/* <Description> */
|
||||
/* Data from the `HVAR' table. */
|
||||
/* */
|
||||
typedef struct GX_HVarTableRec_
|
||||
{
|
||||
GX_HVStoreRec itemStore; /* Item Variation Store */
|
||||
GX_WidthMapRec widthMap; /* Advance Width Mapping */
|
||||
#if 0
|
||||
GX_LSBMap LsbMap; /* not implemented */
|
||||
GX_RSBMap RsbMap; /* not implemented */
|
||||
#endif
|
||||
|
||||
} GX_HVarTableRec, *GX_HVarTable;
|
||||
|
||||
|
||||
/*************************************************************************/
|
||||
/* */
|
||||
/* <Struct> */
|
||||
|
|
@ -89,6 +160,11 @@ FT_BEGIN_HEADER
|
|||
FT_Bool avar_checked;
|
||||
GX_AVarSegment avar_segment;
|
||||
|
||||
FT_Bool hvar_loaded;
|
||||
FT_Bool hvar_checked;
|
||||
FT_Error hvar_error;
|
||||
GX_HVarTable hvar_table;
|
||||
|
||||
FT_UInt tuplecount; /* shared tuples in `gvar' */
|
||||
FT_Fixed* tuplecoords; /* tuplecoords[tuplecount][num_axis] */
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue