The deprecated POST version 2.5 can be handled using the data
structures of version 2.0. The goal is to reduce the footprint.
* include/freetype/internal/tttypes.h (TT_Post_Names): Absorb and...
(TT_Post_20, TT_Post_25): ... remove these structures.
src/sfnt/ttpost.c (load_post_names, tt_face_get_ps_name,
tt_face_free_ps_names, load_format_20): Updated accordingly.
(load_format_25): ditto and convert offsets to glyph indices.
* src/sfnt/ttpost.c (load_format_20): Decrease casts.
(load_format_25): Check the table length and impose a theoretical
glyph number limit usable with 8-bit offset. Decrease casts.
(load_post_names): Pass the mapping data length without 2 bytes.
* src/sfnt/ttpost.c (load_format_20): Co-allocate the string data and
their pointers, which makes it easier to handle and free them.
(tt_face_free_ps_names): Updated.
* include/freetype/internal/tttypes.h (TT_Post_20): Update type.
Modern compilers get more insistent on that...
* include/freetype/internal/compiler-macros.h (FALL_THROUGH): Define.
* src/*: Use it instead of `/* fall through */` comments.
Fixes https://bugs.chromium.org/p/skia/issues/detail?id=14021
* src/sfnt/ttcolr.c (VAR_IDX_BASE_SIZE): New macro.
(tt_face_get_colorline_stops): Fix off-by-one bounds check calculation, take
`VarColorStop` into account, and hopefully make it easier to read.
* src/sfnt/ttcolr.c (read_paint): Add `colr` argument, necessary for...
... another use of `ENSURE_READ_BYTES`.
Update callers.
(tt_face_get_paint_layers): Ensure that the 4-byte paint table
offset can be read.
This is a follow-up to !124 and issue
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=52404
* src/sfnt/ttcolr.c (ENSURE_READ_BYTES): New macro.
(read_paint): Use it – after the start pointer `p` has been checked for
whether it allows reading the format byte, each successive paint table field
read need to be bounds-checked before reading further values.
Reported as
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=52404
Add a check that the document content is actually contained within the
`SVG ` table. Without this check a malformed font may claim arbitrary
memory as its document content.
* src/sfnt/ttsvg.c (tt_face_load_svg): Take `numEntries` into account when
testing 'documentRecord' extents.
(find_doc): Rename `stream` to `document_records` for clarity.
(tt_face_load_svg_doc): Split `doc` from `doc_list` pointer for clarity.
Test that the document content is contained within the table.
Ensure minimum length of document before testing for gzip format.
Reported as
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=51812
* src/sfnt/ttcolr.c (tt_face_load_colr): If the version is determined to
be 1, then the table size has to be at least the size of the v1 header.
Also, for peeking the number of base glyphs and entries in the layer list,
ensure that the table is sufficiently long.
Fixes#1179. Original patch by Sergey Temnikov.
Fixes#1178.
* src/sfnt/ttcolr.c (get_deltas_for_var_index_base): Set outer index to
0 and inner index to the delta index when retrieving deltas if the
`COLR` table has no delta set index map.
Fixes#1172.
* src/sfnt/sfobjs.c (sfnt_load_face): Tag font as Multiple Masters font if
`fvar` is present; do not require other tables to be present.
* src/truetype/ttgxvar.c (tt_set_mm_blend): Allow for a missing 'gvar' table
when setting variation coordinates. However, if a 'gvar' table is actually
present, do perform a sanity check and fail on malformedness.
(TT_Get_MM_Var): Don't assume 'fvar' needs 'gvar' or 'CFF2 tables in all
cases, which is an overly tight check.
* src/sfnt/ttcolr.c (FT_PaintFormat_Internal): New enumeration values
`FT_COLR_PAINTFORMAT_INTERNAL_VAR_SKEW`,
`FT_COLR_PAINTFORMAT_INTERNAL_SKEW_CENTER`, and
`FT_COLR_PAINTFORMAT_INTERNAL_VAR_SKEW_CENTER`.
(read_paint): Handle new enumeration values.
* src/sfnt/ttcolr.c (FT_PaintFormat_Internal): New enumeration values
`FT_COLR_PAINTFORMAT_INTERNAL_VAR_ROTATE` and
`FT_COLR_PAINTFORMAT_INTERNAL_VAR_ROTATE_CENTER`.
(read_paint): Handle new enumeration values.
* src/sfnt/ttcolr.c (FT_PaintFormat_Internal): New enumeration value
`FT_COLR_PAINTFORMAT_INTERNAL_VAR_TRANSLATE`.
(read_paint): Handle new enumeration value.
* src/sfnt/ttcolr.c (FT_PaintFormat_Internal): New enumeration value
`FT_COLR_PAINTFORMAT_INTERNAL_VAR_TRANSFORM`.
(read_paint): Handle new enumeration value.
* src/sfnt/ttcolr.c (read_paint) [TT_CONFIG_OPTION_GX_VAR_SUPPORT]: Read and
apply deltas to radial, linear, and sweep gradient coordinates such as 'p0',
'p1', 'p2', 'center', 'radii', and 'angles'.
* include/freetype/ftcolor.h (FT_ColorStopIterator): Add field
`read_variable` to indicate whether a variation index base should be read.
* src/sfnt/ttcolr.c: (FT_PaintFormat_Internal): New enumerations
`FT_COLR_PAINTFORMAT_INTERNAL_VAR_LINEAR_GRADIENT`
`FT_COLR_PAINTFORMAT_INTERNAL_VAR_RADIAL_GRADIENT`, and
`FT_COLR_PAINTFORMAT_INTERNAL_VAR_SWEEP_GRADIENT`.
(read_color_line): New parameter `read_variable`; update callers.
(read_paint): Handle new enumerations.
* src/sfnt/ttcolr.c (FT_PaintFormat_Internal_): New enumeration
`FT_COLR_PAINTFORMAT_INTERNAL_VAR_SOLID`.
(get_deltas_for_var_index_base) [TT_CONFIG_OPTION_GX_VAR_SUPPORT]: New
function to retrieve an array of delta values, which will be used for most
of 'COLR' v1 variation formats (in follow-up commits).
(read_paint): Add `face` parameter; update caller.
Handle `FT_COLR_PAINTFORMAT_INTERNAL_VAR_SOLID`.
* src/sfnt/ttcolr.c: Include `ttobjs.h` temporarily.
(VARIABLE_COLRV1_ENABLED): New temporary macro to detect whether variable
COLRv1 is enabled.
(Colr): New fields `var_store` and `delta_set_idx_map`.
(tt_face_load_colr, tt_face_free_colr) [VARIABLE_COLRV1_ENABLED]: Load and
free variation store data using the functions from the Multiple Masters
service.
