David Gwilliam
6d2c5ba304
- Print first few frames periodically to aid debugging - Remove obsolete design doc This helps inspect buffer contents when running headless tests.
104 lines
3.1 KiB
Python
104 lines
3.1 KiB
Python
"""
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Null/headless display backend.
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"""
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import time
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class NullDisplay:
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"""Headless/null display - discards all output.
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This display does nothing - useful for headless benchmarking
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or when no display output is needed. Captures last buffer
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for testing purposes.
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"""
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width: int = 80
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height: int = 24
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_last_buffer: list[str] | None = None
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def __init__(self):
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self._last_buffer = None
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def init(self, width: int, height: int, reuse: bool = False) -> None:
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"""Initialize display with dimensions.
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Args:
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width: Terminal width in characters
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height: Terminal height in rows
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reuse: Ignored for NullDisplay (no resources to reuse)
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"""
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self.width = width
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self.height = height
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self._last_buffer = None
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def show(self, buffer: list[str], border: bool = False) -> None:
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import sys
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from engine.display import get_monitor, render_border
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# Get FPS for border (if available)
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fps = 0.0
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frame_time = 0.0
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monitor = get_monitor()
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if monitor:
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stats = monitor.get_stats()
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avg_ms = stats.get("pipeline", {}).get("avg_ms", 0) if stats else 0
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frame_count = stats.get("frame_count", 0) if stats else 0
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if avg_ms and frame_count > 0:
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fps = 1000.0 / avg_ms
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frame_time = avg_ms
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# Apply border if requested (same as terminal display)
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if border:
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buffer = render_border(buffer, self.width, self.height, fps, frame_time)
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self._last_buffer = buffer
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# For debugging: print first few frames to stdout
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if hasattr(self, "_frame_count"):
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self._frame_count += 1
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else:
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self._frame_count = 0
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# Only print first 5 frames or every 10th frame
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if self._frame_count <= 5 or self._frame_count % 10 == 0:
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sys.stdout.write("\n" + "=" * 80 + "\n")
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sys.stdout.write(
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f"Frame {self._frame_count} (buffer height: {len(buffer)})\n"
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)
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sys.stdout.write("=" * 80 + "\n")
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for i, line in enumerate(buffer[:30]): # Show first 30 lines
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sys.stdout.write(f"{i:2}: {line}\n")
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if len(buffer) > 30:
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sys.stdout.write(f"... ({len(buffer) - 30} more lines)\n")
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sys.stdout.flush()
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if monitor:
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t0 = time.perf_counter()
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chars_in = sum(len(line) for line in buffer)
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elapsed_ms = (time.perf_counter() - t0) * 1000
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monitor.record_effect("null_display", elapsed_ms, chars_in, chars_in)
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def clear(self) -> None:
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pass
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def cleanup(self) -> None:
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pass
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def get_dimensions(self) -> tuple[int, int]:
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"""Get current dimensions.
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Returns:
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(width, height) in character cells
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"""
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return (self.width, self.height)
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def is_quit_requested(self) -> bool:
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"""Check if quit was requested (optional protocol method)."""
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return False
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def clear_quit_request(self) -> None:
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"""Clear quit request (optional protocol method)."""
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pass
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