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internals: Support characters beyond the first unicode plane (WIP)

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We used 16-bit variables to store the 'character code' everywhere but
this won't let us represent anything beyond U+FFFF.

This patch changes those variables to a custom type that can be 32 or 16
bits depending on the build, and adjusts numerous internal APIs and
datastructures to match.  This includes:

 * utf8decode() and friends
 * on-screen keyboard
 * font manipulation, caching, rendering, and generation
 * VFAT code parses and generates utf16 dirents
 * WIN32 simulator reads and writes utf16 filenames

Note that this patch doesn't _enable_ >16bit unicode support; a followup
patch will turn that on for appropriate targets.

Known bugs:

  * Native players in 32-bit unicode mode generate mangled filename
    entries if they include UTF16 surrogate codepoints.  Root cause
    is unclear, and may reside in core dircache code.

Needs testing on:

 * windows simulator (16bit+32bit)

Change-Id: I193a00fe2a11a4181ddc82df2d71be52bf00b6e6
This commit is contained in:
Solomon Peachy 2024-12-17 08:55:21 -05:00
parent 94712b34d4
commit d05c59f35b
44 changed files with 480 additions and 335 deletions
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4
tools/convbdf.c
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@ -116,7 +116,7 @@ int gen_h = 0;
int gen_fnt = 0;
int gen_map = 1;
int start_char = 0;
int limit_char = 65535;
int limit_char = 1024*1024; /* 2**20, ie max unicode codepoint */
int oflag = 0;
char outfile[256];
@ -569,7 +569,7 @@ struct font* bdf_read_font(char *path)
int bdf_read_header(FILE *fp, struct font* pf)
{
int encoding;
int firstchar = 65535;
int firstchar = 1024*1024; /* Max Unicode is 2**20 */
int lastchar = -1;
char buf[256];
char facename[256];