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Win32: Fix keymap for keyboard layouts that can print UTF-16 surrogates and ligatures 

Old implementation with `MapVirtualKey(..., MAPVK_VK_TO_CHAR) & 0x7FFFF` simply returned `A`..`Z` for VK_A..VK_Z and
completely useless <U+0002 START OF TEXT> (`WCH_LGTR 0xF002` without high-order bit) in case of ligature.

See https://kbdlayout.info/features/ligatures for a list of affected keyboard layouts.
More info on `MAPVK_VK_TO_CHAR`: https://stackoverflow.com/a/72464584/1795050
main
Dimitriy Ryazantcev 2023-11-22 15:44:53 +02:00 committed by Sam Lantinga
parent 08c6ac1b16
commit 7e86b6aef2
1 changed files with 33 additions and 11 deletions
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44
src/video/windows/SDL_windowskeyboard.c
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@ -44,9 +44,6 @@ static SDL_bool IME_IsTextInputShown(SDL_VideoData *videodata);
#ifndef MAPVK_VSC_TO_VK
#define MAPVK_VSC_TO_VK 1
#endif
#ifndef MAPVK_VK_TO_CHAR
#define MAPVK_VK_TO_CHAR 2
#endif
/* Alphabetic scancodes for PC keyboards */
void WIN_InitKeyboard(SDL_VideoDevice *_this)
@ -120,6 +117,7 @@ void WIN_UpdateKeymap(SDL_bool send_event)
SDL_Keycode keymap[SDL_NUM_SCANCODES];
SDL_GetDefaultKeymap(keymap);
WIN_ResetDeadKeys();
for (i = 0; i < SDL_arraysize(windows_scancode_table); i++) {
int vk;
@ -130,20 +128,44 @@ void WIN_UpdateKeymap(SDL_bool send_event)
}
/* If this key is one of the non-mappable keys, ignore it */
/* Uncomment the second part re-enable the behavior of not mapping the "`"(grave) key to the users actual keyboard layout */
if ((keymap[scancode] & SDLK_SCANCODE_MASK) /*|| scancode == SDL_SCANCODE_GRAVE*/) {
/* Uncomment the third part to re-enable the behavior of not mapping the "`"(grave) key to the users actual keyboard layout */
if ((keymap[scancode] & SDLK_SCANCODE_MASK) || scancode == SDL_SCANCODE_DELETE /*|| scancode == SDL_SCANCODE_GRAVE*/) {
continue;
}
vk = MapVirtualKey(i, MAPVK_VSC_TO_VK);
if (vk) {
int ch = (MapVirtualKey(vk, MAPVK_VK_TO_CHAR) & 0x7FFF);
if (!vk) {
continue;
}
/* Always map VK_A..VK_Z to SDLK_a..SDLK_z codes.
* This was behavior with MapVirtualKey(MAPVK_VK_TO_CHAR). */
//if (vk >= 'A' && vk <= 'Z') {
// keymap[scancode] = SDLK_a + (vk - 'A');
//} else {
{
BYTE keyboardState[256] = { 0 };
WCHAR buffer[16] = { 0 };
Uint32 *ch = 0;
int result = ToUnicode(vk, i, keyboardState, buffer, 16, 0);
buffer[SDL_abs(result) + 1] = 0;
/* Convert UTF-16 to UTF-32 code points */
ch = (Uint32 *)SDL_iconv_string("UTF-32LE", "UTF-16LE", (const char *)buffer, (SDL_abs(result) + 1) * sizeof(WCHAR));
if (ch) {
if (ch >= 'A' && ch <= 'Z') {
keymap[scancode] = SDLK_a + (ch - 'A');
if (ch[0] != 0 && ch[1] != 0) {
/* We have several UTF-32 code points on a single key press.
* Cannot fit into single SDL_Keycode in keymap.
* See https://kbdlayout.info/features/ligatures */
keymap[scancode] = 0xfffd; /* U+FFFD REPLACEMENT CHARACTER */
} else {
keymap[scancode] = ch;
keymap[scancode] = ch[0];
}
SDL_free(ch);
}
if (result < 0) {
WIN_ResetDeadKeys();
}
}
}
@ -186,7 +208,7 @@ void WIN_ResetDeadKeys()
}
for (i = 0; i < 5; i++) {
result = ToUnicode(keycode, scancode, keyboardState, (LPWSTR)buffer, 16, 0);
result = ToUnicode(keycode, scancode, keyboardState, buffer, 16, 0);
if (result > 0) {
/* success */
return;