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[truetype] Add HVAR access without advance width map. 

* src/truetype/ttgxvar.c (ft_var_load_hvar): Handle case where
`offsetToAdvanceWidthMapping' is zero.
(tt_hadvance_adjust): Implement direct deltaSet access by glyph
index.
This commit is contained in:
Werner Lemberg 2017-01-06 20:31:22 +01:00
parent 8b755445bb
commit 7e1cce58b5
3 changed files with 48 additions and 17 deletions
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9
ChangeLog
View File

@ -1,3 +1,12 @@
2017-01-06 Werner Lemberg <wl@gnu.org>
[truetype] Add HVAR access without advance width map.
* src/truetype/ttgxvar.c (ft_var_load_hvar): Handle case where
`offsetToAdvanceWidthMapping' is zero.
(tt_hadvance_adjust): Implement direct deltaSet access by glyph
index.
2017-01-06 Werner Lemberg <wl@gnu.org>
[pcf] Revise driver.

52
src/truetype/ttgxvar.c
View File

@ -436,6 +436,7 @@
FT_ULong table_len;
FT_ULong table_offset;
FT_ULong store_offset;
FT_ULong widthMap_offset;
FT_ULong* dataOffsetArray = NULL;
@ -464,9 +465,8 @@
goto Exit;
}
/* skip map offset */
if ( FT_READ_ULONG( store_offset ) ||
FT_STREAM_SKIP( 4 ) )
if ( FT_READ_ULONG( store_offset ) ||
FT_READ_ULONG( widthMap_offset ) )
goto Exit;
/* parse item variation store */
@ -619,7 +619,7 @@
/* Parse delta set. */
/* */
/* On input, deltas are ( shortDeltaCount + regionIdxCount ) bytes */
/* On input, deltas are (shortDeltaCount + regionIdxCount) bytes */
/* each; on output, deltas are expanded to `regionIdxCount' shorts */
/* each. */
if ( FT_NEW_ARRAY( hvarData->deltaSet,
@ -660,6 +660,7 @@
/* end parse item variation store */
/* parse width map */
if ( widthMap_offset )
{
GX_WidthMap widthMap;
@ -789,7 +790,6 @@
GX_HVarData varData;
FT_UInt innerIndex, outerIndex;
FT_UInt master, j;
FT_Fixed netAdjustment = 0; /* accumulated adjustment */
FT_Fixed scaledDelta;
@ -815,18 +815,40 @@
/* 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 )
if ( face->blend->hvar_table->widthMap.innerIndex )
{
FT_TRACE2(( "gindex %d out of range\n", gindex ));
error = FT_THROW( Invalid_Argument );
goto Exit;
}
FT_UInt innerIndex, outerIndex;
/* 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];
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];
}
else
{
/* no widthMap data; use glyph index as inner index instead */
/* (and value 0 for outer index) */
varData = &face->blend->hvar_table->itemStore.varData[0];
if ( gindex >= varData->itemCount )
{
FT_TRACE2(( "gindex %d out of range\n", gindex ));
error = FT_THROW( Invalid_Argument );
goto Exit;
}
deltaSet = &varData->deltaSet[varData->regionIdxCount * gindex];
}
/* See pseudo code from `Font Variations Overview' */
/* in the OpenType specification. */

4
src/truetype/ttgxvar.h
View File

@ -125,8 +125,8 @@ FT_BEGIN_HEADER
GX_HVStoreRec itemStore; /* Item Variation Store */
GX_WidthMapRec widthMap; /* Advance Width Mapping */
#if 0
GX_LSBMap LsbMap; /* not implemented */
GX_RSBMap RsbMap; /* not implemented */
GX_LSBMap lsbMap; /* not implemented */
GX_RSBMap rsbMap; /* not implemented */
#endif
} GX_HVarTableRec, *GX_HVarTable;