The estimate is based on the taxi perimeter with extra space added
for local extrema.
* src/smooth/ftgrays.c (gray_taxi): New function for the perimeter.
(gray_convert_glyph): Updated, banding suppressed.
This is a proof of concept for `malloc` overhead benchmarking.
* src/smooth/ftgrays.c (gray_TWorker): Store `memory`.
(gray_convert_glyph): Allocate memory dynamically and handle errors.
(gray_raster_render): Set memory.
The general square root calculations are not necessary in FreeType.
For vector normalization or length, FreeType uses special functions.
It is, however, required in the legacy CFF specifications.
* src/base/ftcalc.c (FT_SqrtFixed): New function that uses either
Babylonian or bit-wise algorithm, whichever is faster for the given
situation.
* include/freetype/internal/ftcalc.h (FT_SqrtFixed): Declare it.
When matching the keywords, we avoid calculating their lengths by
checking the stored values. This itself is a sufficient pre-check
before diving into `memcmp`. Therefore, we remove explicit check of
the first characters.
* include/freetype/internal/psaux.h (T1_FieldRec): Store length.
* src/cid/cidload.c (cid_parse_dict): Use `memcmp` and stored length.
* src/type1/t1load.c (parse_dict): Ditto.
* src/type42/t42parse.c (t42_parse_dict): Ditto.
* src/cff/cffobjs.c (remove_style): Rewrite using pointers.
(remove_subset_prefix): Unwrap loop and use `memmove`.
* src/truetype/ttobjs.c (tt_skip_pdffont_random_tag): Unwrap loop
and avoid `strlen`.
This also reduces the used heap size by a large factor.
From Behdad.
* src/autofit/afcjk.h (AF_CJKAxisRec): Use `AF_BLUE_STRINGSET_MAX_LEN`.
* src/autofit/aflatin.h (AF_LatinAxisRec): Ditto.
==========================
Tag sources with `VER-2-13-2'.
* docs/VERSION.TXT: Add entry for version 2.13.2.
* docs/CHANGES: Updated.
* docs/release, docs/README, builds/macs/README: Updated.
* README, src/base/ftver.rc, builds/windows/vc2010/index.html,
builds/windows/visualc/index.html, builds/windows/visualce/index.html,
builds/wince/vc2005-ce/index.html, builds/wince/vc2008-ce/index.html,
docs/freetype-config.1: s/2.13.1/2.13.2/, s/2131/2132/.
* include/freetype/freetype.h (FREETYPE_PATCH): Set to 2.
* builds/unix/configure.raw (version_info): Set to 26:1:20.
* CMakeLists.txt (VERSION_PATCH): Set to 2.
`FT_NEW_ARRAY(p, 0)` sets `p` to `NULL`. `FT_Stream_ReadAt` with a
memory based stream uses `FT_MEM_COPY` which is `memcpy` which specifies
that it is undefined behavior for either the `src` or `dst` to be
`NULL`. Instead of forcing all callers work around calling
`FT_Stream_Read` when `buffer == NULL && count == 0` do the check in
`FT_StreamRead`. This allows any call with `count == 0` to succesfully
read zero bytes without UB.
* src/base/ftstream.c (FT_Stream_ReadAt): skip `FT_MEM_COPY` when
`count == 0`. (FT_Stream_TryRead): ditto
Fixes: #1250
The values read into `base_glyphs_offset_v1` and `layer_offset_v1` may
be in the range 0xFFFFFFFD-0xFFFFFFFF. On systems where `unsigned long`
is 32 bits adding 4 to such values will wrap and pass bounds checks but
accessing values at such offsets will be out of bounds.
On the other hand `table_size` has already been tested to be at least
`COLRV1_HEADER_SIZE` (34) so it is safe to subtract 4 from it.
* src/sfnt/ttcolr.c (tt_face_load_colr): subtract 4 from `table_size`
instead of adding 4 to font data offsets in bounds checks
Fixes: https://crbug.com/1469348
In WOFF the `totalSfntSize` must be correct, however in WOFF2 this value
is now just a hint and a conforming implementation must not reject
otherwise valid data if the `totalSfntSize` turns out not to be exact.
* src/sfnt/sfwoff2.c (woff2_open_font): remove check that uncompressed
woff2 data would fit in the sfnt size guess.
Fixes: #1235
Alexei Podtelezhnikov