From e422322650f9cb057937182987071438f9c79e84 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Fri, 30 Oct 2020 09:49:54 +0100
Subject: Add support for korean and all chinese characters

---
 src/Text.cpp | 41 +++++++++++++++++++++++++++++++----------
 1 file changed, 31 insertions(+), 10 deletions(-)

(limited to 'src/Text.cpp')

diff --git a/src/Text.cpp b/src/Text.cpp
index 51ff054..360f290 100644
--- a/src/Text.cpp
+++ b/src/Text.cpp
@@ -202,17 +202,38 @@ namespace QuickMedia
             || (codepoint >= 0xFF5F && codepoint <= 0xFF9F);    // Katakana and punctuation (half width)
     }
 
-    static size_t find_end_of_japanese(const sf::Uint32 *str, size_t size) {
+    static bool is_korean_codepoint(sf::Uint32 codepoint) {
+        return codepoint >= 0xAC00 && codepoint <= 0xD7A3;
+    }
+
+    // TODO: Is there a more efficient way to do this? maybe chinese characters have a specific bit-pattern?
+    static bool is_chinese_codepoint(sf::Uint32 codepoint) {
+        return (codepoint >= 0x4E00 && codepoint <= 0x9FFF)     // CJK Unified Ideographs
+            || (codepoint >= 0x3400 && codepoint <= 0x4DBF)     // CJK Unified Ideographs Extension A
+            || (codepoint >= 0x20000 && codepoint <= 0x2A6DF)   // CJK Unified Ideographs Extension B
+            || (codepoint >= 0x2A700 && codepoint <= 0x2B73F)   // CJK Unified Ideographs Extension C
+            || (codepoint >= 0x2B740 && codepoint <= 0x2B81F)   // CJK Unified Ideographs Extension D
+            || (codepoint >= 0x2B820 && codepoint <= 0x2CEAF)   // CJK Unified Ideographs Extension E
+            || (codepoint >= 0xF900 && codepoint <= 0xFAFF)     // CJK Compatibility Ideographs
+            || (codepoint >= 0x2F800 && codepoint <= 0x2FA1F);  // CJK Compatibility Ideographs Supplement
+    }
+
+    // TODO: Merge chinese, japanese and korean codepoints into one function since they share ranges
+    static bool is_cjk_codepoint(sf::Uint32 codepoint) {
+        return is_chinese_codepoint(codepoint) || is_japanese_codepoint(codepoint) || is_korean_codepoint(codepoint);
+    }
+
+    static size_t find_end_of_cjk(const sf::Uint32 *str, size_t size) {
         for(size_t i = 0; i < size; ++i) {
-            if(!is_japanese_codepoint(str[i]))
+            if(!is_cjk_codepoint(str[i]))
                 return i;
         }
         return size;
     }
 
-    static size_t find_end_of_non_japanese(const sf::Uint32 *str, size_t size) {
+    static size_t find_end_of_non_cjk(const sf::Uint32 *str, size_t size) {
         for(size_t i = 0; i < size; ++i) {
-            if(is_japanese_codepoint(str[i]))
+            if(is_cjk_codepoint(str[i]))
                 return i;
         }
         return size;
@@ -224,13 +245,13 @@ namespace QuickMedia
         size_t size = str.getSize();
         while(index < size) {
             size_t offset;
-            bool is_japanese = is_japanese_codepoint(str[index]);
-            if(is_japanese)
-                offset = find_end_of_japanese(str.getData() + index + 1, size - index - 1);
+            bool is_cjk = is_cjk_codepoint(str[index]);
+            if(is_cjk)
+                offset = find_end_of_cjk(str.getData() + index + 1, size - index - 1);
             else
-                offset = find_end_of_non_japanese(str.getData() + index + 1, size - index - 1);
+                offset = find_end_of_non_cjk(str.getData() + index + 1, size - index - 1);
             textElements.push_back({ StringViewUtf32(str.getData() + index, offset + 1), TextElement::Type::TEXT });
-            textElements.back().is_japanese = is_japanese;
+            textElements.back().is_cjk = is_cjk;
             index += 1 + offset;
         }
     }
@@ -302,7 +323,7 @@ namespace QuickMedia
             TextElement &textElement = textElements[textElementIndex];
             const sf::Font *ff = font;
             int vertices_index = 0;
-            if(textElement.is_japanese) {
+            if(textElement.is_cjk) {
                 ff = cjk_font;
                 vertices_index = 1;
             }
-- 
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