minhngoc25a
/
freetype2
mirror of git://git.savannah.gnu.org/freetype/freetype2.git
2
1
Fork 2
Code Issues 9 Releases Wiki Activity

[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.
This commit is contained in:
Dominik Röttsches 2022-07-30 12:09:21 +03:00 committed by Werner Lemberg
parent 649352ab73
commit 919561ca8c
1 changed files with 30 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
src/sfnt/ttcolr.c
View File

@ -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 */