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Add Arabic text shaping support for chat functionality

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This commit introduces Arabic text shaping in the chat application by adding `ArabicShaping.cpp` and `ArabicShaping.h` for handling contextual forms and visual reordering.

The rendering logic in `ChatScreen.cpp` is updated to utilize this new functionality, adjusting cursor positions accordingly. Other UI components, including `UIControl_Base.cpp`, `UIControl_Label.cpp`, and `UIControl_SaveList.cpp`, are modified to ensure proper display of Arabic text.

Additionally, `Font.cpp` is enhanced with methods for efficient rendering of pre-shaped text.
This commit is contained in:
Revela
2026-03-17 17:08:58 -05:00
parent d473ef0dc5
commit e786604228
17 changed files with 717 additions and 28 deletions
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22
Minecraft.Client/ChatScreen.cpp
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@@ -6,6 +6,7 @@
#include "..\Minecraft.World\SharedConstants.h"
#include "..\Minecraft.World\StringHelpers.h"
#include "..\Minecraft.World\ChatPacket.h"
#include "..\Minecraft.World\ArabicShaping.h"
const wstring ChatScreen::allowedChars = SharedConstants::acceptableLetters;
vector<wstring> ChatScreen::s_chatHistory;
@@ -154,14 +155,21 @@ void ChatScreen::render(int xm, int ym, float a)
int x = 4;
drawString(font, prefix, x, height - 12, 0xe0e0e0);
x += font->width(prefix);
wstring beforeCursor = message.substr(0, cursorIndex);
wstring afterCursor = message.substr(cursorIndex);
drawStringLiteral(font, beforeCursor, x, height - 12, 0xe0e0e0);
x += font->widthLiteral(beforeCursor);
// Shape the full message as one unit so letter connections and word order
// are correct. Track where the logical cursor maps in the visual string.
int visualCursorPos = 0;
wstring shaped = shapeArabicText(message, cursorIndex, &visualCursorPos);
// Render the full shaped message without re-shaping it
drawStringPreshaped(font, shaped, x, height - 12, 0xe0e0e0);
// Place the cursor at the correct visual position
wstring beforeCursorVisual = shaped.substr(0, visualCursorPos);
int cursorX = x + font->widthPreshaped(beforeCursorVisual);
if (frame / 6 % 2 == 0)
drawString(font, L"_", x, height - 12, 0xe0e0e0);
x += font->width(L"_");
drawStringLiteral(font, afterCursor, x, height - 12, 0xe0e0e0);
drawString(font, L"_", cursorX, height - 12, 0xe0e0e0);
Screen::render(xm, ym, a);
}