[FL-2556] Update complete screen (#1332)

* Desktop: slideshow implementation
* Updater: handling splashscreen installation; added format version field to slideshow binary
* Desktop: added bidirectional slideshow navigation + instant cancel by "back" button; Updater: rebalanced update stages weights
* Updater: fixed missing field init; fixed potential loop when baking slideshows
* Assets: fixed "update complete" image to match original
* Desktop: added check for slideshow file version
* Scripts: slideshow.py cleanup
* Desktop: removed first start intro sequence
* Desktop: removed first start remnants

scripts/slideshow.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python3
+
+import os
+import struct
+
+from flipper.app import App
+from flipper.assets.icon import file2image
+
+
+class Main(App):
+    MAGIC = 0x72676468
+    VERSION = 1
+
+    def init(self):
+        self.parser.add_argument("-i", "--input", help="input folder", required=True)
+        self.parser.add_argument("-o", "--output", help="output file", required=True)
+
+        self.parser.set_defaults(func=self.pack)
+
+    def pack(self):
+        if not os.path.exists(self.args.input):
+            self.logger.error(f'"{self.args.input}" does not exist')
+            return 1
+
+        file_idx = 0
+        images = []
+        while True:
+            frame_filename = os.path.join(self.args.input, f"frame_{file_idx:02}.png")
+            if not os.path.exists(frame_filename):
+                break
+
+            self.logger.debug(f"working on {frame_filename}")
+            try:
+                images.append(file2image(frame_filename))
+                self.logger.debug(f"Processed frame #{file_idx}")
+                file_idx += 1
+            except Exception as e:
+                self.logger.error(e)
+                break
+
+        widths = set(img.width for img in images)
+        heights = set(img.height for img in images)
+        if len(widths) != 1 or len(heights) != 1:
+            self.logger.error("All images must have same dimensions!")
+            return 2
+
+        data = struct.pack(
+            "<IBBBB", self.MAGIC, self.VERSION, widths.pop(), heights.pop(), len(images)
+        )
+        for image in images:
+            data += struct.pack("<H", len(image.data))
+            data += image.data
+
+        with open(self.args.output, mode="wb") as file:
+            file.write(data)
+
+        return 0
+
+
+if __name__ == "__main__":
+    Main()()