add support for overlay_position

adafruit_pycamera/__init__.py

@@ -238,6 +238,8 @@ def __init__(self) -> None:  # pylint: disable=too-many-statements
         self.overlay_transparency_color = None
         self.overlay_bmp = None
         self.combined_bmp = None
+        self.preview_scale = None
+        self.overlay_position = [None, None]
         self.splash = displayio.Group()
 
         # Reset display and I/O expander
@@ -645,6 +647,8 @@ def resolution(self, res):
             microcontroller.nvm[_NVM_RESOLUTION] = res
             self._resolution = res
             self._res_label.text = self.resolutions[res]
+            _width = int(self.resolutions[self.resolution].split("x")[0])
+            self.preview_scale = 240 / _width
         self.display.refresh()
 
     @property
@@ -928,8 +932,8 @@ def blit_overlay_into_last_capture(self):
         bitmaptools.blit(
             photo_bitmap,
             self.overlay_bmp,
-            0,
-            0,
+            self.overlay_position[0] if self.overlay_position[0] is not None else 0,
+            self.overlay_position[1] if self.overlay_position[1] is not None else 0,
             skip_source_index=self.overlay_transparency_color,
             skip_dest_index=None,
         )
@@ -1003,8 +1007,16 @@ def blit(self, bitmap, x_offset=0, y_offset=32):
             bitmaptools.rotozoom(
                 self.combined_bmp,
                 self.overlay_bmp,
-                scale=0.75,
+                scale=self.preview_scale,
                 skip_index=self.overlay_transparency_color,
+                ox=int(self.overlay_position[0] * self.preview_scale)
+                if self.overlay_position[0] is not None
+                else None,
+                oy=int(self.overlay_position[1] * self.preview_scale)
+                if self.overlay_position[1] is not None
+                else None,
+                px=0 if self.overlay_position[0] is not None else None,
+                py=0 if self.overlay_position[1] is not None else None,
             )
             bitmap = self.combined_bmp
 

examples/overlay/code_select.py

@@ -11,7 +11,6 @@
 import traceback
 import adafruit_pycamera  # pylint: disable=import-error
 
-
 pycam = adafruit_pycamera.PyCamera()
 pycam.mode = 0  # only mode 0 (JPEG) will work in this example
 
@@ -34,6 +33,7 @@
 
 pycam.overlay = f"/sd/overlays/{overlay_files[cur_overlay_idx]}"
 pycam.overlay_transparency_color = 0xE007
+pycam.overlay_position = [0, 0]
 
 overlay_files = os.listdir("/sd/overlays/")
 cur_overlay_idx = 0
@@ -49,6 +49,16 @@
         print(f"changing overlay to {overlay_files[cur_overlay_idx]}")
         pycam.overlay = f"/sd/overlays/{overlay_files[cur_overlay_idx]}"
 
+    if not pycam.down.value:
+        pycam.overlay_position[1] += 1 * (int(pycam.down.current_duration / 0.3) + 1)
+    if not pycam.up.value:
+        pycam.overlay_position[1] -= 1 * (int(pycam.up.current_duration / 0.3) + 1)
+
+    if not pycam.left.value:
+        pycam.overlay_position[0] -= 1 * (int(pycam.left.current_duration / 0.3) + 1)
+    if not pycam.right.value:
+        pycam.overlay_position[0] += 1 * (int(pycam.right.current_duration / 0.3) + 1)
+
     if pycam.shutter.short_count:
         print("Shutter released")
         pycam.tone(1200, 0.05)