common: Add the display module.

[gps-watch.git] / src / common / screen.rs

diff --git a/src/common/screen.rs b/src/common/screen.rs
new file mode 100644 (file)
index 0000000..71425c4
--- /dev/null
+++ b/src/common/screen.rs
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2019 Tilman Sauerbeck (tilman at code-monkey de)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+pub const HEIGHT_PX: usize = 70;
+pub const WIDTH_PX: usize = 70;
+
+pub const WIDTH_BYTES: usize = (WIDTH_PX as usize + 7) / 8;
+
+pub const SIZE_BYTES: usize = HEIGHT_PX as usize * WIDTH_BYTES;
+
+pub struct Screen {
+    pixels: [u8; SIZE_BYTES],
+}
+
+impl Screen {
+    pub fn new() -> Screen {
+        Screen {
+            pixels: [0u8; SIZE_BYTES],
+        }
+    }
+
+    pub fn pixel(&self, index: usize) -> u8 {
+        self.pixels[index]
+    }
+
+    pub fn blit(&mut self, new_contents: [u8; SIZE_BYTES]) {
+        self.pixels = new_contents;
+    }
+}