add shm support

kitty.py

@@ -5,14 +5,103 @@ import sys
 import termios
 import tty
 from base64 import standard_b64encode
-from io import BytesIO
 import array
 import fcntl
 
+import zlib
 
-async def draw_to_terminal(buffer: BytesIO) -> None:
-    """Display a PNG image in the terminal."""
-    await _write_chunked(a="T", i=1, f=100, q=2, data=buffer)
+
+import mmap
+import os
+import select
+from enum import Enum
+
+SHM_NAME = "/kitty-shm-frame"
+
+
+class Kitty_Format(Enum):
+    RGB = 24
+    RGBA = 32
+    PNG = 100
+
+
+async def draw_to_terminal(
+    buffer,
+    width: int | None,
+    height: int | None,
+    pixel_format: Kitty_Format = Kitty_Format.RGBA,
+    image_num: int = 1,
+    compress=False,
+    use_shm: bool = False,
+) -> None:
+    """Display an image in the terminal."""
+    if (pixel_format != Kitty_Format.PNG or use_shm) and (width is None or height is None):
+        raise ValueError(
+            "shm transfer or using image formats other than PNG and require height and width"
+        )
+
+    kwargs = {"a": "T", "i": image_num, "f": pixel_format.value, "t": "s" if use_shm else "d", "q": 2}
+
+    if width:
+        kwargs["s"] = width
+    if height:
+        kwargs["v"] = height
+
+    if compress:
+        kwargs["o"] = "z"
+        data = zlib.compress(buffer)
+    else:
+        data = buffer
+
+    if use_shm:
+        # write to shm
+        _mmap(data, width, height)
+        # set shm name as payload
+        data = SHM_NAME
+
+    await _write_chunked(**kwargs, data=data)
+    await asyncio.sleep(0.001)
+
+
+def _mmap(np_image, width: int, height: int) -> None:
+    """Write image data to shared memory"""
+    shm_size = width * height * 4  # RGBA
+
+    fd = os.open(f"/dev/shm{SHM_NAME}", os.O_CREAT | os.O_RDWR)
+    os.ftruncate(fd, shm_size)
+    shm = mmap.mmap(fd, shm_size, mmap.MAP_SHARED, mmap.PROT_WRITE)
+
+    # write to shared memory
+    shm.seek(0)
+    shm.write(np_image.tobytes())
+    shm.flush()
+
+
+def supports_kitty_graphics(timeout=0.1) -> bool:
+    """Check if the terminal has support for the graphics protocol."""
+    if not sys.stdout.isatty():
+        return False
+
+    fd = sys.stdin.fileno()
+    old_settings = termios.tcgetattr(fd)
+    try:
+        # Set terminal to raw mode
+        tty.setraw(fd)
+        # Send Kitty graphics query escape code
+        sys.stdout.write("\033_Gs=1,v=1,a=q,t=d,f=24;AAAA\033\\")
+        sys.stdout.flush()
+
+        # Wait for response with timeout
+        rlist, _, _ = select.select([fd], [], [], timeout)
+        if not rlist:
+            return False
+
+        # Read response
+        response = os.read(fd, 1024).decode("utf-8", "ignore")
+        return response.startswith("\033_GOK")
+    finally:
+        # Restore terminal settings
+        termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
 
 
 async def get_terminal_cell_size() -> tuple[int, int]:
@@ -60,14 +149,16 @@ def _serialize_gr_command(**cmd) -> bytes:
 
 
 async def _write_chunked(**cmd) -> None:
-    data = standard_b64encode(cmd.pop("data"))
-    loop = asyncio.get_running_loop()
+    if cmd["t"] == "s":
+        data = standard_b64encode(bytes(cmd.pop("data"), "utf-8"))
+    else:
+        data = standard_b64encode(cmd.pop("data"))
     while data:
         chunk, data = data[:4096], data[4096:]
         m = 1 if data else 0
         payload = _serialize_gr_command(payload=chunk, m=m, **cmd)
-        await loop.run_in_executor(None, sys.stdout.buffer.write, payload)
-        await loop.run_in_executor(None, sys.stdout.flush)
+        sys.stdout.buffer.write(payload)
+        sys.stdout.flush()
         cmd.clear()
 
 
@@ -86,7 +177,19 @@ def set_position(y: int, x: int) -> None:
     _write_stdout(f"\x1b[{y};{x}H")
 
 
+async def get_position() -> tuple[int, int]:
+    """Get the (y, x) position of the cursor"""
+    reply = await _query_terminal("\x1b[6n", "R")
+
+    match = re.search(r"\[(\d+);(\d+)R", reply)
+    if match:
+        y, x = map(int, match.groups())
+        return y, x
+    raise ValueError("Failed to parse cursor position response")
+
+
 def _write_stdout(cmd: str) -> None:
+    """Write a command string to stdout and flush."""
     sys.stdout.write(cmd)
     sys.stdout.flush()
 
@@ -120,43 +223,18 @@ async def _query_terminal(escape: str, endchar: str) -> str:
     return response
 
 
-async def get_position() -> tuple[int, int]:
-    """Get the (y, x) position of the cursor"""
-    reply = await _query_terminal("\x1b[6n", "R")
-
-    match = re.search(r"\[(\d+);(\d+)R", reply)
-    if match:
-        y, x = map(int, match.groups())
-        return y, x
-    raise ValueError("Failed to parse cursor position response")
-
-
 async def main():
-    import pyvista as pv
-
     rows, cols = get_terminal_size()
     v_pix, h_pix = await get_terminal_cell_size()
     height, width = await get_terminal_size_pixel()
     y, x = await get_position()
 
-    y, x = await get_position()
     print(f"Terminal has {rows} rows, {cols} cols = {rows * cols} cells")
     print(f"Cell size: {h_pix}x{v_pix} px")
     print(f"Dimensions: {width}x{height} px")
     print("Cursor is at y, x:", y, x)
+    print(f"Supports graphics: {supports_kitty_graphics()}")
 
-    new_lines = int((height / v_pix) - 6)
-    print("\n" * new_lines, end="")
-
-    set_position(y - new_lines - 6, x)
-
-    s = pv.Sphere()
-    pl = pv.Plotter(off_screen=True)
-    pl.add_mesh(s)
-    b = BytesIO()
-    pl.screenshot(b, transparent_background=True, window_size=(width, height))
-
-    await draw_to_terminal(b)
 
 if __name__ == "__main__":
     asyncio.run(main())