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| author | Dominik Röttsches <drott@chromium.org> | 2022-07-30 12:09:21 +0300 |
|---|---|---|
| committer | Werner Lemberg <wl@gnu.org> | 2022-07-30 15:24:58 +0200 |
| commit | 919561ca8c2a7b245644767b49d08e638d34d4eb (patch) | |
| tree | 6f978a96166e6892de733e273693023d6950109f | |
| parent | 649352ab7370c4d7c3dbbe12cf6768681422ac39 (diff) | |
| download | freetype2-919561ca8c2a7b245644767b49d08e638d34d4eb.tar.gz | |
[sfnt] Implement VarClipBox.
* src/sfnt/ttcolr.c (tt_face_get_color_glyph_clipbox): Depending on the
format, read `var_index_base`, then retrieve and apply scaled deltas.
| -rw-r--r-- | src/sfnt/ttcolr.c | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/src/sfnt/ttcolr.c b/src/sfnt/ttcolr.c index 9a1e9a301..25051a49c 100644 --- a/src/sfnt/ttcolr.c +++ b/src/sfnt/ttcolr.c @@ -1362,7 +1362,7 @@ clip_list_format = FT_NEXT_BYTE ( p ); /* Format byte used here to be able to upgrade ClipList for >16bit */ - /* glyph ids; for now we can expect it to be 0. */ + /* glyph ids; for now we can expect it to be 1. */ if ( !( clip_list_format == 1 ) ) return 0; @@ -1390,7 +1390,7 @@ format = FT_NEXT_BYTE( p1 ); - if ( format > 1 ) + if ( format > 2 ) return 0; /* Check whether we can extract four `FWORD`. */ @@ -1410,6 +1410,34 @@ font_clip_box.yMax = FT_MulFix( FT_NEXT_SHORT( p1 ), face->root.size->metrics.y_scale ); +#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT + if ( VARIABLE_COLRV1_ENABLED && format == 2 ) + { + FT_ULong var_index_base = 0; + /* varIndexBase offset for clipbox is 3 at most. */ + FT_ItemVarDelta item_deltas[4] = { 0, 0, 0, 0 }; + + + /* Check whether we can extract a 32-bit VarIdxBase now. */ + if ( p1 > limit - 4 ) + return 0; + + var_index_base = FT_NEXT_ULONG( p1 ); + + if ( !get_deltas_for_var_index_base( face, colr, var_index_base, 4, + item_deltas ) ) + return 0; + + font_clip_box.xMin += + FT_MulFix( item_deltas[0], face->root.size->metrics.x_scale ); + font_clip_box.yMin += + FT_MulFix( item_deltas[1], face->root.size->metrics.y_scale ); + font_clip_box.xMax += + FT_MulFix( item_deltas[2], face->root.size->metrics.x_scale ); + font_clip_box.yMax += + FT_MulFix( item_deltas[3], face->root.size->metrics.y_scale ); + } +#endif /* Make 4 corner points (xMin, yMin), (xMax, yMax) and transform */ /* them. If we we would only transform two corner points and */ |