REVIEWED: Avoid `rtext` dependency on `rcore_desktop_sdl` #4959

src/platforms/rcore_desktop_sdl.c

@@ -424,6 +424,8 @@ void ClosePlatform(void);                                    // Close platform
 
 static KeyboardKey ConvertScancodeToKey(SDL_Scancode sdlScancode);  // Help convert SDL scancodes to raylib key
 
+static int GetCodepointNextSDL(const char *text, int *codepointSize); // Get next codepoint in a byte sequence and bytes processed
+
 //----------------------------------------------------------------------------------
 // Module Functions Declaration
 //----------------------------------------------------------------------------------
@@ -1601,13 +1603,18 @@ void PollInputEvents(void)
             {
                 // NOTE: event.text.text data comes an UTF-8 text sequence but we register codepoints (int)
 
-                int codepointSize = 0;
-
                 // Check if there is space available in the queue
                 if (CORE.Input.Keyboard.charPressedQueueCount < MAX_CHAR_PRESSED_QUEUE)
                 {
                     // Add character (codepoint) to the queue
-                    CORE.Input.Keyboard.charPressedQueue[CORE.Input.Keyboard.charPressedQueueCount] = GetCodepointNext(event.text.text, &codepointSize);
+                    #if defined(PLATFORM_DESKTOP_SDL3)
+                    unsigned int textLen = strlen(event.text.text);
+                    unsigned int codepoint = (unsigned int)SDL_StepUTF8(&event.text.text, textLen);
+                    #else
+                    int codepointSize = 0;
+                    codepoint = GetCodepointNextSDL(event.text.text, &codepointSize);
+                    #endif
+                    CORE.Input.Keyboard.charPressedQueue[CORE.Input.Keyboard.charPressedQueueCount] = codepoint;
                     CORE.Input.Keyboard.charPressedQueueCount++;
                 }
             } break;
@@ -2093,4 +2100,42 @@ static KeyboardKey ConvertScancodeToKey(SDL_Scancode sdlScancode)
 
     return KEY_NULL; // No equivalent key in Raylib
 }
-// EOF
+
+// Get next codepoint in a byte sequence and bytes processed
+static int GetCodepointNextSDL(const char *text, int *codepointSize)
+{
+    const char *ptr = text;
+    int codepoint = 0x3f;       // Codepoint (defaults to '?')
+    *codepointSize = 1;
+
+    // Get current codepoint and bytes processed
+    if (0xf0 == (0xf8 & ptr[0]))
+    {
+        // 4 byte UTF-8 codepoint
+        if (((ptr[1] & 0xC0) ^ 0x80) || ((ptr[2] & 0xC0) ^ 0x80) || ((ptr[3] & 0xC0) ^ 0x80)) { return codepoint; } // 10xxxxxx checks
+        codepoint = ((0x07 & ptr[0]) << 18) | ((0x3f & ptr[1]) << 12) | ((0x3f & ptr[2]) << 6) | (0x3f & ptr[3]);
+        *codepointSize = 4;
+    }
+    else if (0xe0 == (0xf0 & ptr[0]))
+    {
+        // 3 byte UTF-8 codepoint */
+        if (((ptr[1] & 0xC0) ^ 0x80) || ((ptr[2] & 0xC0) ^ 0x80)) { return codepoint; } // 10xxxxxx checks
+        codepoint = ((0x0f & ptr[0]) << 12) | ((0x3f & ptr[1]) << 6) | (0x3f & ptr[2]);
+        *codepointSize = 3;
+    }
+    else if (0xc0 == (0xe0 & ptr[0]))
+    {
+        // 2 byte UTF-8 codepoint
+        if ((ptr[1] & 0xC0) ^ 0x80) { return codepoint; } // 10xxxxxx checks
+        codepoint = ((0x1f & ptr[0]) << 6) | (0x3f & ptr[1]);
+        *codepointSize = 2;
+    }
+    else if (0x00 == (0x80 & ptr[0]))
+    {
+        // 1 byte UTF-8 codepoint
+        codepoint = ptr[0];
+        *codepointSize = 1;
+    }
+
+    return codepoint;
+}