add a way to specify resample method for xdisplay_mirror

examples/xdisplay_mirror.py

@@ -20,20 +20,35 @@
 
 import click
 import numpy as np
-from PIL import ImageGrab
+from PIL import Image, ImageGrab
 
 import adafruit_blinka_raspberry_pi5_piomatter as piomatter
 import adafruit_blinka_raspberry_pi5_piomatter.click as piomatter_click
 from adafruit_blinka_raspberry_pi5_piomatter.pixelmappers import simple_multilane_mapper
 
+RESAMPLE_MAP = {
+    "nearest": Image.NEAREST,
+    "bilinear": Image.BILINEAR,
+    "lanczos": Image.LANCZOS,
+    "bicubic": Image.BICUBIC
+}
+
 
 @click.command
 @click.option("--mirror-region", help="Region of X display to mirror. Comma seperated x,y,w,h. "
                                       "Default will mirror entire display.", default="")
 @click.option("--x-display", help="The X display to mirror. Default is :0", default=":0")
+@click.option("--resample-method",
+              help="The resample method for PIL to use when resizing the screen image."
+                   "Valid values are: nearest, bilinear, lanczos, and bicubic. Default is nearest",
+              default="nearest")
 @piomatter_click.standard_options(n_lanes=2, n_temporal_planes=0)
 def main(width, height, serpentine, rotation, pinout, n_planes,
-         n_temporal_planes, n_addr_lines, n_lanes, mirror_region, x_display):
+         n_temporal_planes, n_addr_lines, n_lanes, mirror_region, x_display, resample_method):
+
+    if resample_method not in RESAMPLE_MAP.keys():
+        raise ValueError(f"--resample-method must be one of: {RESAMPLE_MAP.keys()}")
+
     if n_lanes != 2:
         pixelmap = simple_multilane_mapper(width, height, n_addr_lines, n_lanes)
         geometry = piomatter.Geometry(width=width, height=height, n_planes=n_planes, n_addr_lines=n_addr_lines,
@@ -56,13 +71,14 @@ def main(width, height, serpentine, rotation, pinout, n_planes,
     while True:
         img = ImageGrab.grab(xdisplay=x_display)
         if mirror_region is not None:
-            img = img.crop((mirror_region[0], mirror_region[1],    # left,top
-                            mirror_region[0] + mirror_region[2],   # right
+            img = img.crop((mirror_region[0], mirror_region[1],  # left,top
+                            mirror_region[0] + mirror_region[2],  # right
                             mirror_region[1] + mirror_region[3]))  # bottom
-        img = img.resize((width, height))
+        img = img.resize((width, height), RESAMPLE_MAP[resample_method])
 
         framebuffer[:, :] = np.array(img)
         matrix.show()
 
+
 if __name__ == '__main__':
     main()