Import of the watch repository from Pebble

tests/fakes/fake_framebuffer.c

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+/*
+ * 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.
+ */
+
+#include "framebuffer.h"
+
+#include "drivers/display.h"
+#include "system/logging.h"
+#include "system/passert.h"
+#include "util/bitset.h"
+
+#include <stdint.h>
+#include <string.h>
+
+const int FrameBuffer_MaxX = DISP_COLS;
+const int FrameBuffer_MaxY = DISP_ROWS;
+
+static FrameBuffer* s_current_framebuffer;
+static uint8_t s_current_flush_line;
+
+static void flush_complete(void);
+static bool flush_get_next_line(DisplayRow* row);
+static void framebuffer_reset_dirty_lines(FrameBuffer* f);
+
+uint32_t* framebuffer_get_line(FrameBuffer* f, uint8_t y) {
+  PBL_ASSERT(y < FrameBuffer_MaxY, "Y coordinate is outside of framebuffer dimensions");
+
+  return f->buffer + (y * FRAMEBUFFER_WORDS_PER_ROW);
+}
+
+void framebuffer_clear(FrameBuffer* f) {
+  memset(f->buffer, 0xffffffff, FRAMEBUFFER_SIZE_BYTES);
+  memset(f->dirty_lines, 0xff, DISP_ROWS / 8);
+  f->is_dirty = true;
+  f->is_cleared = false;
+}
+
+void framebuffer_clear_line(FrameBuffer* f, uint8_t y) {
+  uint32_t* line = framebuffer_get_line(f, y);
+  memset(line, 0xffffffff, FRAMEBUFFER_SIZE_BYTES);
+  bitset8_set(f->dirty_lines, y);
+
+  f->is_dirty = true;
+}
+
+void framebuffer_mark_dirty_rect(FrameBuffer* f, GRect rect) {
+  const uint16_t y_start = rect.origin.y;
+  const uint16_t y_end = y_start + rect.size.h;
+  for (uint16_t y = y_start; y < y_end; ++y) {
+    bitset8_update(f->dirty_lines, y, is_dirty);
+  }
+
+  f->is_dirty = true;
+}
+
+void framebuffer_set_line(FrameBuffer* f, uint8_t y, const uint32_t* buffer) {
+  memcpy(framebuffer_get_line(f, y), buffer, FRAMEBUFFER_WORDS_PER_ROW);
+  bitset8_set(f->dirty_lines, y);
+
+  f->is_dirty = true;
+}
+
+void framebuffer_set_lines(FrameBuffer* f, uint8_t y, const uint8_t num_lines, const uint32_t* buffer) {
+  uint32_t* line = framebuffer_get_line(f, y);
+  memcpy(line, buffer, num_lines * FRAMEBUFFER_WORDS_PER_ROW);
+  const GRect dirty_rect = GRect(0, y, DISP_COLS, num_lines);
+  framebuffer_mark_dirty_rect(f, dirty_rect);
+}
+
+void framebuffer_flush(FrameBuffer* f) {
+  // If the framebuffer hasn't been cleared but it is dirty, issue a
+  // display command to blank the screen.
+  if (f->is_cleared) {
+    display_clear();
+    f->is_cleared = false;
+  }
+
+  if (!f->is_dirty) {
+    return;
+  }
+
+  s_current_framebuffer = f;
+  s_current_flush_line = 0;
+  display_update(&flush_get_next_line, &flush_complete);
+}
+
+static void flush_complete(void) {
+  s_current_flush_line = 0;
+  framebuffer_reset_dirty_lines(s_current_framebuffer);
+}
+
+static bool flush_get_next_line(DisplayRow* row) {
+  while (s_current_flush_line < DISP_ROWS) {
+    if (bitset8_get(s_current_framebuffer->dirty_lines, s_current_flush_line)) {
+      row->address = s_current_flush_line;
+      row->data = framebuffer_get_line(s_current_framebuffer, s_current_flush_line);
+      s_current_flush_line++;
+      return true;
+    }
+
+    s_current_flush_line++;
+  }
+
+  return false;
+}
+
+static void framebuffer_reset_dirty(FrameBuffer* f) {
+  memset(f->dirty_lines, 0x00, DISP_ROWS / 8);
+  f->is_dirty = false;
+  f->is_cleared = false;
+}
+
+