#22 use bytesio

src/picam/picam.py

@@ -1,3 +1,5 @@
+from io import BytesIO
+
 class PiCam:
     def __init__(self, config: dict):
         self.capture_resolution = config["capture_resolution"]
@@ -17,14 +19,14 @@ class PiCam:
         """
         self.preview_resolution = resolution
 
-    def capture(self) -> bytearray:
+    def capture(self) -> BytesIO:
         """Capture an image
 
         :returns: Image data as a byte buffer
         """
         raise NotImplementedError
 
-    def capture_preview(self) -> bytearray:
+    def capture_preview(self) -> BytesIO:
         """Capture a preview image for the viewfinder
 
         :returns: Image data as a byte buffer

src/picam/picam1.py

@@ -34,14 +34,7 @@ class PiCam1(PiCam):
         self.camera.close()
         self.camera = None
 
-    def capture(self, preview: bool = False) -> bytearray:
-        # Bytes to hold output buffer
-        if preview:
-            # Multiply by 3 for individual R, G, B values
-            out = bytearray((self.preview_resolution[0] * self.preview_resolution[1]) * 3)
-        else:
-            out = bytearray((self.capture_resolution[0] * self.capture_resolution[1]) * 3)
-
+    def capture(self, preview: bool = False) -> BytesIO:
         if not preview:
             # If preview we'll already have the right resolution
             self.set_camera_resolution(self.capture_resolution)
@@ -49,15 +42,13 @@ class PiCam1(PiCam):
         bytes_stream = BytesIO()
         self.camera.capture(bytes_stream, format='rgb', use_video_port=preview)
 
-        bytes_stream.seek(0)
-        bytes_stream.readinto(out)
-        bytes_stream.close()
-
         if not preview:
             # If preview we'll already have the right resolution
             self.set_camera_resolution(self.preview_resolution)
 
-        return out
+        bytes_stream.seek(0)
 
-    def capture_preview(self) -> bytearray:
+        return bytes_stream
+
+    def capture_preview(self) -> BytesIO:
         return self.capture(preview=True)

src/picamui/picamui.py

@@ -41,7 +41,7 @@ class PiCamUi:
         self.uiElements.append(btnExit)
 
     def updatePreview(self, rgb, res):
-        img = pygame.image.frombuffer(rgb, res, 'RGB')
+        img = pygame.image.load(rgb, res, 'RGB')
         img = pygame.transform.scale(img, (self.screen.get_width(), self.screen.get_height()))
 
         if img: