unicode: Support characters beyond the first unicode plane

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
 * font manipulation, caching, rendering, and generation
 * on-screen keyboard
 * FAT filesystem (parsing and generating utf16 LFNs)
 * WIN32 simulator platform code

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

Appears to work on:

  * hosted linux, native, linux simulator in both 16/32-bit modes.

Needs testing on:

  * windows and macos simulator (16bit+32bit)

Change-Id: Iba111b27d2433019b6bff937cf1ebd2c4353a0e8
This commit is contained in:
Solomon Peachy 2024-12-17 08:55:21 -05:00
parent 2a88253426
commit a2c10f6189
44 changed files with 476 additions and 330 deletions

View file

@ -70,7 +70,7 @@ static const char keybd_layout[] =
* - \n does not create a key, but it also consumes one element
* - the final null terminator is equivalent to \n
* - since sizeof includes the null terminator we don't need +1 for that. */
static unsigned short kbd_buf[sizeof(keybd_layout)];
static ucschar_t kbd_buf[sizeof(keybd_layout)];
/****************** prototypes ******************/
void print_scroll(char* string); /* implements a scrolling screen */
@ -164,7 +164,7 @@ static void config_set_defaults(void)
gAnnounce.announce_on = 0;
gAnnounce.grouping = 0;
gAnnounce.wps_fmt[0] = '\0';
gAnnounce.show_prompt = true;
gAnnounce.show_prompt = true;
}
static void config_reset_voice(void)
@ -250,7 +250,7 @@ static int announce_menu_cb(int action,
struct gui_synclist *this_list)
{
(void)this_item;
unsigned short* kbd_p;
ucschar_t *kbd_p;
int selection = rb->gui_synclist_get_sel_pos(this_list);