tree 1ac228293c2e369407ac25d5c3a57b74b6eb2bca
parent 81cf5326d59282265ccc0911050005a4b5d20a99
author Nikhil Ramakrishnan <ramakrishnan.nikhil@gmail.com> 1562967857 +0530
committer Werner Lemberg <wl@gnu.org> 1566891558 +0200

[woff2] Reconstruct transformed `glyf' table.

Reconstruct `glyf' table if it is transformed in the uncompressed
table stream.  Also add necessary structures, macros and functions.

* include/freetype/internal/wofftypes.h (WOFF2_InfoRec,
WOFF2_SubstreamRec, WOFF2_PointRec): New structures.
(WOFF2_TableRec): s/OrigLength/dst_length/.

* src/sfnt/sfwoff2.c (READ_255USHORT, READ_BASE128): Use
`FT_SET_ERROR' to set implicit `error' variable.

(WRITE_SHORT): New macro.

(N_CONTOUR_STREAM, N_POINTS_STREAM, FLAG_STREAM, GLYPH_STREAM,
COMPOSITE_STREAM, BBOX_STREAM, INSTRUCTION_STREAM): New macros to
refer to substreams of the transformed `glyf' tables.

(Read255UShort, ReadBase128): Return errors set by `FT_READ_XXX'
macros.

(with_sign, safe_int_addition): New functions to add sign to values
based on a flag and perform safe addition respectively.

(triplet_decode): Decode variable-length (flag, xCoordinate,
yCoordinate) triplet for a simple glyph.   See

  https://www.w3.org/TR/WOFF2/#triplet_decoding

(store_points, compute_bbox, composteGlyph_size, reconstruct_glyf):
New functions.

(reconstruct_font): Call `reconstruct_glyf'.

* src/sfnt/sfwoff2.h: Add required constants.

* src/sfnt/woff2tags.h: Move out constants to `sfwoff2.h'.