Add other corner triangles & enable in C side

kitty/fonts.c

@@ -556,10 +556,14 @@ START_ALLOW_CASE_RANGE
             return BLANK_FONT;
         case 0x2500 ... 0x2570:
         case 0x2574 ... 0x259f:
-        case 0xe0b0:
-        case 0xe0b2:
-        case 0xe0b4:
-        case 0xe0b6:
+        case 0xe0b0: // 
+        case 0xe0b2: // 
+        case 0xe0b4: // 
+        case 0xe0b6: // 
+        case 0xe0b8: // 
+        case 0xe0ba: //   
+        case 0xe0bc: // 
+        case 0xe0be: //   
             return BOX_FONT;
         default:
             ans = in_symbol_maps(fg, cpu_cell->ch);

kitty/fonts/box_drawing.py

@@ -173,12 +173,19 @@ def triangle(buf, width, height, left=True):
 
 
 def corner_triangle(buf, width, height, corner):
-    diagonal_y = line_equation(0, 0, width - 1, height - 1)
-
-    if corner == 'top-right':
-        xlimits = [(0, diagonal_y(x)) for x in range(width)]
-    elif corner == 'bottom-left':
-        xlimits = [(diagonal_y(x), height - 1) for x in range(width)]
+    print(f"corner_triangle: corner is '{corner}'")
+    if corner == 'top-right' or corner == 'bottom-left':
+        diagonal_y = line_equation(0, 0, width - 1, height - 1)
+        if corner == 'top-right':
+            xlimits = [(0, diagonal_y(x)) for x in range(width)]
+        elif corner == 'bottom-left':
+            xlimits = [(diagonal_y(x), height - 1) for x in range(width)]
+    else:
+        diagonal_y = line_equation(width - 1, 0, 0, height - 1)
+        if corner == 'top-left':
+            xlimits = [(0, diagonal_y(x)) for x in range(width)]
+        elif corner == 'bottom-right':
+            xlimits = [(diagonal_y(x), height - 1) for x in range(width)]
     fill_region(buf, width, height, xlimits)
 
 
@@ -469,8 +476,10 @@ box_chars = {
     '': [p(triangle, left=False)],
     '': [D],
     '': [p(D, left=False)],
-    '': [p(corner_triangle, corner='top-right')],
     '': [p(corner_triangle, corner='bottom-left')],
+    '': [p(corner_triangle, corner='bottom-right')],
+    '': [p(corner_triangle, corner='top-left')],
+    '': [p(corner_triangle, corner='top-right')],
     '═': [dhline],
     '║': [dvline],
     '╞': [vline, p(half_dhline, which='right')],