make album art fit inside overlay, use top left pixel of album art as overlay color, only change album art on album changes

SoundslabDisplay.py

@@ -24,10 +24,14 @@ class SoundslabDisplay:
         self.current_overlay    = Image.new("RGBA", self.screen_size, (0, 0, 0, 0))
         self.current_menu       = Image.new("RGBA", self.screen_size, (0, 0, 0, 0))
         self.fg_color = (255, 255, 255, 211)
-        self.bg_color = (0, 0, 0, 78)
+        self.bg_color = (0, 0, 0, 127)
         # set up connection to mpd here - TODO: this belongs elsewhere and should be passed or pulled in
         self.player_client = musicpd.MPDClient()
         self.player_client.connect()
+        # track battery voltage over time so we can figure out if we're charging the battery or not
+        self.previous_voltage = 0.0
+        # track currently playing song's art path to eliminate unnecessary reloads of the same image file
+        self.current_art_path = None
 
     def getBatteryState(self):
         bus = smbus.SMBus(1)
@@ -42,14 +46,16 @@ class SoundslabDisplay:
         swapped = struct.unpack("<H", struct.pack(">H", read))[0]
         capacity = swapped / 256
 
+        self.previous_voltage = voltage
+
         return (voltage, capacity)
 
     
-    def updateOverlay(self, battery_level_percent):
+    def updateOverlay(self):
         # initialize overlay
         im_overlay = Image.new("RGBA", self.screen_size, (0, 0, 0, 0))
         font = ImageFont.truetype(font='/usr/share/fonts/truetype/hack/Hack-Bold.ttf', size=18)
-        small_font = ImageFont.truetype(font='/usr/share/fonts/truetype/hack/Hack-Regular.ttf', size=12)
+        small_font = ImageFont.truetype(font='/usr/share/fonts/truetype/hack/Hack-Regular.ttf', size=14)
         overlay = ImageDraw.Draw(im_overlay)
 
         # draw four rects on edges of screen_size
@@ -69,11 +75,12 @@ class SoundslabDisplay:
         overlay.text((10, 0), track_and_queue, font=font, fill=self.fg_color)
         
         # add battery level 
+        previous_voltage = self.previous_voltage
         (voltage, capacity) = self.getBatteryState()
         battery_display = '{:02.2f}'.format(capacity) + '%'
-        (voltage2, capacity2) = self.getBatteryState()
         battery_display_offset = 80
-        if voltage2 > voltage:
+        print("Battery: voltage: " + str(voltage) + " prev voltage: " + str(previous_voltage) + " capacity: " + str(capacity))
+        if voltage > previous_voltage:
             # we're probably charging!
             battery_display = 'Chrg ' + battery_display
             battery_display_offset = 130
@@ -95,13 +102,21 @@ class SoundslabDisplay:
     def updateAlbumArt(self):
         current_status = self.player_client.status()
         song_data = self.player_client.playlistid(current_status['songid'])
-        print(song_data[0]['file'])
         path_info = song_data[0]['file'].split('/')
-        print(path_info)
         cover_image_file = '/media/usb0/' + path_info[0] + '/' + path_info[1] + '/cover.jpg'
-        im = Image.open(cover_image_file).convert("RGBA")
+        if cover_image_file != self.current_art_path:
-        image = im.resize(self.screen_size)
+            self.current_art_path = cover_image_file
-        self.current_background = image.copy()
+            im = Image.open(cover_image_file).convert("RGBA")
+            image = im.resize((200, 200))
+            # get dominant color from album art
+            #test_image = im.convert("RGB")
+            #test_image.resize((1, 1), resample=0)
+            #dominant_color = test_image.getpixel((0, 0))
+            # get top left pixel color instead and use that!
+            dominant_color = image.getpixel((0, 0))
+            backing = Image.new("RGBA", self.screen_size, dominant_color)
+            backing.paste(image, (20, 20))
+            self.current_background = backing.copy()
         
     def updateDisplay(self):
         tempoutput = Image.alpha_composite(self.current_background, self.current_overlay)