Import of the watch repository from Pebble

tests/fakes/fake_display.h

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#define DISP_BYTES_LINE DISP_COLS / 8
+// Bytes_per_line + 1 byte for the line address + 1 byte for a null trailer + 1 optional byte for a write command
+#define DISP_DMA_BUFFER_SIZE (DISP_BYTES_LINE + 3)
+
+typedef struct {
+  uint8_t address;
+  uint8_t* data;
+} DisplayRow;
+
+typedef bool(*NextRowCallback)(DisplayRow* row);
+typedef void(*UpdateCompleteCallback)(void);
+
+typedef enum {
+  DISPLAY_STATE_IDLE,
+  DISPLAY_STATE_WRITING
+} DisplayState;
+
+typedef struct {
+  DisplayState state;
+  NextRowCallback get_next_row;
+  UpdateCompleteCallback complete;
+} DisplayContext;
+
+
+void display_init(void);
+
+void display_clear(void);
+
+void display_update(NextRowCallback nrcb, UpdateCompleteCallback uccb);
+
+void display_enter_static(void);
+
+void display_pulse_vcom(void);