use 0x0 / zeros as redraw sentinel

Author: jquast

gambaterm/run.py

@@ -132,7 +132,7 @@ def run(
                     maybe_clear_seq = b"\033[H\033[2J"
                     height, width = new_size
                     refx, refy = get_ref(width, height, console)
-                    last_frame = ~video
+                    last_frame.fill(0)
                 else:
                     maybe_clear_seq = b""
                 # Render frame with synchronized output mode (DEC 2026) to prevent flickering

termblit_ext/termblit.pyx

@@ -154,10 +154,10 @@ cdef char* _blit(
 
     cdef int current_x = refx
     cdef int current_y = refy
-    # Use values that can never match a real pixel (high byte is always
-    # 0xFF in GB pixel format)
-    cdef uint32_t current_fg = 0x00DEAD00
-    cdef uint32_t current_bg = 0x00BEEF00
+    # Use 0x0 as "undrawn" sentinel: real GB pixels always have 0xFF
+    # in the high byte, so 0x0 can never match
+    cdef uint32_t current_fg = 0x0
+    cdef uint32_t current_bg = 0x0
     cdef int row_index, column_index
     cdef uint32_t color1, color2
     cdef int new_x, new_y