Fixed block rendering issues

Fixed issues where graphic blocks had horizontal stripes in them

src/teletext/charsets.py

@@ -15,10 +15,10 @@ ENGLISH = {
 
 # Swedish/Finnish/Hungarian - Option 010 (2)
 SWEDISH_FINNISH = {
-    0x23: '#', 0x24: '¤', 0x40: 'É', 
+    0x23: '#', 0x24: '\u00A4', 0x40: '\u00C9', 
-    0x5B: 'Ä', 0x5C: 'Ö', 0x5D: 'Å', 0x5E: 'Ü', 
+    0x5B: '\u00C4', 0x5C: '\u00D6', 0x5D: '\u00C5', 0x5E: '\u00DC', 
-    0x5F: '_', 0x60: 'é', 
+    0x5F: '_', 0x60: '\u00E9', 
-    0x7B: 'ä', 0x7C: 'ö', 0x7D: 'å', 0x7E: 'ü'
+    0x7B: '\u00E4', 0x7C: '\u00F6', 0x7D: '\u00E5', 0x7E: '\u00FC'
 }
 
 # German - Option 001 (1) 
@@ -58,3 +58,22 @@ def get_char(byte_val, subset_idx):
         return mapping[valid_byte]
         
     return chr(valid_byte)
+
+import unicodedata
+
+def get_byte_from_char(char, subset_idx):
+    if len(char) != 1: return 0
+    
+    # Normalize input to NFC to match our map keys (if they are NFC, which python literals usually are)
+    char = unicodedata.normalize('NFC', char)
+    
+    if subset_idx < 0 or subset_idx >= len(SETS):
+        subset_idx = 0
+        
+    mapping = SETS[subset_idx]
+    
+    for code, mapped_char in mapping.items():
+        if mapped_char == char:
+            return code
+            
+    return ord(char)

src/teletext/renderer.py

@@ -4,7 +4,7 @@ from PyQt6.QtGui import QPainter, QColor, QFont, QImage, QBrush, QPen
 from PyQt6.QtCore import Qt, QRect, QSize, pyqtSignal
 
 from .models import Page, Packet
-from .charsets import get_char
+from .charsets import get_char, get_byte_from_char
 
 # Helper to create a blank packet
 def create_blank_packet(magazine: int, row: int) -> Packet:
@@ -168,7 +168,8 @@ class TeletextCanvas(QWidget):
                 
                 # Check if text is a single char
                 if len(text) == 1:
-                    byte_val = ord(text)
+                    byte_val = get_byte_from_char(text, self.subset_idx)
+                    
                     # Simple filter
                     if byte_val > 255: byte_val = 0x3F # ?
                     
@@ -188,7 +189,7 @@ class TeletextCanvas(QWidget):
                      # But for sanity, let's just append.
                      
                      # Write the char
-                     byte_val = ord(text)
+                     byte_val = get_byte_from_char(text, self.subset_idx)
                      if byte_val > 255: byte_val = 0x3F
                      new_packet.data[self.cursor_x] = byte_val
                      
@@ -365,7 +366,12 @@ class TeletextCanvas(QWidget):
         if val >= 0x20:
             bits = val - 0x20
             
-        blocks = [
+        # Grid definitions for 2x3 grid
+        x_splits = [0, int(self.cell_w / 2), self.cell_w]
+        y_splits = [0, int(self.cell_h / 3), int(2 * self.cell_h / 3), self.cell_h]
+        
+        # Block indices (col, row) for the 6 bits
+        block_indices = [
             (0, 0), (1, 0), # Top
             (0, 1), (1, 1), # Mid
             (0, 2), (1, 2)  # Bot
@@ -373,24 +379,26 @@ class TeletextCanvas(QWidget):
         
         bit_mask = [1, 2, 4, 8, 16, 64] # 64 is bit 6
         
-        bw = self.cell_w / 2
-        bh = self.cell_h / 3
-        
-        if not contiguous:
-            bw -= 1
-            bh -= 1
-        
         painter.setPen(Qt.PenStyle.NoPen)
         painter.setBrush(QBrush(color))
         
         for i in range(6):
             if bits & bit_mask[i]:
-                bx = x + blocks[i][0] * (self.cell_w / 2)
+                c, r = block_indices[i]
-                by = y + blocks[i][1] * (self.cell_h / 3)
+                
+                bx_local = x_splits[c]
+                by_local = y_splits[r]
+                bw = x_splits[c+1] - x_splits[c]
+                bh = y_splits[r+1] - y_splits[r]
+                
+                bx = x + bx_local
+                by = y + by_local
                 
                 if not contiguous:
                     bx += 1
                     by += 1
+                    bw -= 1
+                    bh -= 1
                     
                 painter.drawRect(QRect(int(bx), int(by), int(bw), int(bh)))