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Windows: Use UTF-32 for preedit text encoding

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The char stream of GLFW API must be UTF-32.
This commit is contained in:
Daijiro Fukuda 2022-05-23 18:16:09 +09:00
parent 68c977ee4d
commit 6c6f5d712f
1 changed files with 59 additions and 24 deletions
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83
src/win32_window.c
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@ -35,6 +35,41 @@
#include <windowsx.h>
#include <shellapi.h>
// Converts utf16 units to Unicode code points (UTF32).
// Returns GLFW_TRUE when the converting completes and the result is assigned to
// the argument `codepoint`.
// Returns GLFW_FALSE when the converting is not yet completed (for
// Surrogate-pair processing) and the unit is assigned to the argument
// `highsurrogate`. It will be used in the next unit's processing.
//
static int convertToUTF32FromUTF16(WCHAR utf16_unit,
WCHAR* highsurrogate,
uint32_t* codepoint)
{
*codepoint = 0;
if (utf16_unit >= 0xd800 && utf16_unit <= 0xdbff)
{
*highsurrogate = (WCHAR) utf16_unit;
return GLFW_FALSE;
}
if (utf16_unit >= 0xdc00 && utf16_unit <= 0xdfff)
{
if (*highsurrogate)
{
*codepoint += (*highsurrogate - 0xd800) << 10;
*codepoint += (WCHAR) utf16_unit - 0xdc00;
*codepoint += 0x10000;
}
}
else
*codepoint = (WCHAR) utf16_unit;
*highsurrogate = 0;
return GLFW_TRUE;
}
// Returns the window style for the specified window
//
static DWORD getWindowStyle(const _GLFWwindow* window)
@ -544,10 +579,13 @@ static GLFWbool getImmPreedit(_GLFWwindow* window)
if (preeditBytes > 0)
{
int i;
uint32_t codepoint;
WCHAR highSurrogate = 0;
int ctext = window->ctext;
int cblocks = window->cblocks;
int focusedBlock = 0;
int length = preeditBytes / sizeof(WCHAR);
int convertedLength = 0;
LPWSTR buffer = _glfw_calloc(preeditBytes, 1);
LPSTR attributes = _glfw_calloc(attrBytes, 1);
DWORD *clauses = _glfw_calloc(clauseBytes, 1);
@ -577,10 +615,16 @@ static GLFWbool getImmPreedit(_GLFWwindow* window)
window->preeditText = preeditText;
window->ctext = ctext;
}
window->ntext = length;
window->preeditText[length] = 0;
for (i = 0; i < length; i++)
window->preeditText[i] = buffer[i];
{
if (convertToUTF32FromUTF16(buffer[i],
&highSurrogate,
&codepoint))
window->preeditText[convertedLength++] = codepoint;
}
window->ntext = convertedLength;
window->preeditText[convertedLength] = 0;
// store blocks
window->nblocks = clauseBytes / sizeof(DWORD) - 1;
@ -628,6 +672,8 @@ static GLFWbool commitImmResultStr(_GLFWwindow* window)
{
HIMC hIMC;
LONG bytes;
uint32_t codepoint;
WCHAR highSurrogate = 0;
if (!window->callbacks.character)
return GLFW_FALSE;
@ -646,7 +692,12 @@ static GLFWbool commitImmResultStr(_GLFWwindow* window)
ImmGetCompositionStringW(hIMC, GCS_RESULTSTR, buffer, bytes);
for (i = 0; i < length; i++)
window->callbacks.character((GLFWwindow*) window, buffer[i]);
{
if (convertToUTF32FromUTF16(buffer[i],
&highSurrogate,
&codepoint))
window->callbacks.character((GLFWwindow*) window, codepoint);
}
_glfw_free(buffer);
}
@ -815,27 +866,11 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM l
case WM_CHAR:
case WM_SYSCHAR:
{
if (wParam >= 0xd800 && wParam <= 0xdbff)
window->win32.highSurrogate = (WCHAR) wParam;
else
{
uint32_t codepoint = 0;
if (wParam >= 0xdc00 && wParam <= 0xdfff)
{
if (window->win32.highSurrogate)
{
codepoint += (window->win32.highSurrogate - 0xd800) << 10;
codepoint += (WCHAR) wParam - 0xdc00;
codepoint += 0x10000;
}
}
else
codepoint = (WCHAR) wParam;
window->win32.highSurrogate = 0;
uint32_t codepoint;
if (convertToUTF32FromUTF16((WCHAR) wParam,
&window->win32.highSurrogate,
&codepoint))
_glfwInputChar(window, codepoint, getKeyMods(), uMsg != WM_SYSCHAR);
}
if (uMsg == WM_SYSCHAR && window->win32.keymenu)
break;