From 493206d552628511259e4f1d579f755e2f7f6a17 Mon Sep 17 00:00:00 2001
From: June Tate-Gans <june@theonelab.com>
Date: Sun, 2 May 2021 15:23:07 -0500
Subject: [PATCH] g13gui: g13: Add a bitwidgets backend for displaying to the
 G13

---
 g13gui/g13gui/g13/displaydevice.py       | 57 ++++++++++++++++++++++++
 g13gui/g13gui/g13/displaydevice_tests.py | 34 ++++++++++++++
 2 files changed, 91 insertions(+)
 create mode 100644 g13gui/g13gui/g13/displaydevice.py
 create mode 100644 g13gui/g13gui/g13/displaydevice_tests.py

diff --git a/g13gui/g13gui/g13/displaydevice.py b/g13gui/g13gui/g13/displaydevice.py
new file mode 100644
index 0000000..633befb
--- /dev/null
+++ b/g13gui/g13gui/g13/displaydevice.py
@@ -0,0 +1,57 @@
+import PIL
+import struct
+from io import BytesIO
+
+from g13gui.bitwidgets.displaydevice import DisplayDevice
+
+
+class DisplayMetrics(object):
+    WIDTH_PIXELS = 160
+    HEIGHT_PIXELS = 48
+
+
+def ImageToLPBM(image):
+    """Simple function to convert a PIL Image into LPBM format."""
+
+    i = PIL.PyAccess.new(image, readonly=True)
+    bio = BytesIO()
+
+    maxBytes = (DisplayMetrics.WIDTH_PIXELS *
+                DisplayMetrics.HEIGHT_PIXELS // 8)
+    row = 0
+    col = 0
+
+    for byteNum in range(0, maxBytes):
+        b = int()
+
+        if row == 40:
+            maxSubrow = 3
+        else:
+            maxSubrow = 8
+
+        for subrow in range(0, maxSubrow):
+            b |= i[col, row + subrow] << subrow
+
+        bio.write(struct.pack('<B', b))
+
+        col += 1
+        if (col % 160) == 0:
+            col = 0
+            row += 8
+
+    return bio.getvalue()
+
+
+class G13DisplayDevice(DisplayDevice):
+    """A bitwidget display device for the G13 LCD"""
+
+    def __init__(self, manager):
+        self._manager = manager
+
+    @property
+    def dimensions(self):
+        return (DisplayMetrics.WIDTH_PIXELS, DisplayMetrics.HEIGHT_PIXELS)
+
+    def update(self, image):
+        lpbm = ImageToLPBM(image)
+        self._manager.setLCDBuffer(lpbm)
diff --git a/g13gui/g13gui/g13/displaydevice_tests.py b/g13gui/g13gui/g13/displaydevice_tests.py
new file mode 100644
index 0000000..8c79e81
--- /dev/null
+++ b/g13gui/g13gui/g13/displaydevice_tests.py
@@ -0,0 +1,34 @@
+import unittest
+import time
+
+from g13gui.model.prefs import Preferences
+from g13gui.bitwidgets.display import Display
+from g13gui.bitwidgets.screen import Screen
+from g13gui.bitwidgets.label import Label
+from g13gui.g13.displaydevice import G13DisplayDevice
+from g13gui.g13.manager import Manager
+
+
+class DisplayDeviceTests(unittest.TestCase):
+    def setUp(self):
+        self.prefs = Preferences()
+        self.manager = Manager(self.prefs)
+        self.manager.start()
+        time.sleep(0.25)
+        self.dd = G13DisplayDevice(self.manager)
+        self.d = Display(self.dd)
+        self.s = Screen(self.d)
+
+    def tearDown(self):
+        time.sleep(1)
+        self.manager.shutdown()
+
+    def testDisplay(self):
+        label = Label(0, 0, 'Hello, world!')
+        label.show()
+        self.s.addChild(label)
+        self.s.nextFrame()
+
+
+if __name__ == '__main__':
+    unittest.main()