Import of the watch repository from Pebble

src/fw/applib/graphics/framebuffer.c

@@ -0,0 +1,66 @@
+/*
+ * 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.
+ */
+
+//! @file framebuffer.c
+//! Bitdepth independant routines for framebuffer.h
+//! Bitdepth depenedant routines can be found in the 1_bit & 8_bit folders in their
+//! respective framebuffer.c files.
+
+#include "applib/graphics/framebuffer.h"
+#include "system/passert.h"
+
+void framebuffer_init(FrameBuffer *fb, const GSize *size) {
+  PBL_ASSERTN(!gsize_equal(size, &GSizeZero));
+  fb->size = *size;
+  framebuffer_reset_dirty(fb);
+  // make sure the size is not bigger than the actual buffer size
+  PBL_ASSERTN(framebuffer_get_size_bytes(fb) <= FRAMEBUFFER_SIZE_BYTES);
+}
+
+GBitmap framebuffer_get_as_bitmap(FrameBuffer *fb, const GSize *size) {
+  PBL_ASSERTN(!gsize_equal(size, &GSizeZero));
+  const GBitmapDataRowInfoInternal *data_row_infos =
+    PBL_IF_RECT_ELSE(NULL, g_gbitmap_spalding_data_row_infos);
+
+  return (GBitmap) {
+    .addr = fb->buffer,
+    .row_size_bytes = gbitmap_format_get_row_size_bytes(size->w, GBITMAP_NATIVE_FORMAT),
+    .info = (BitmapInfo) {.format = GBITMAP_NATIVE_FORMAT, .version = GBITMAP_VERSION_CURRENT},
+    .bounds = (GRect) { GPointZero, *size },
+    .data_row_infos = data_row_infos,
+  };
+}
+
+void framebuffer_dirty_all(FrameBuffer *fb) {
+  PBL_ASSERTN(!gsize_equal(&fb->size, &GSizeZero));
+  fb->dirty_rect = (GRect) { GPointZero, fb->size };
+  fb->is_dirty = true;
+}
+
+void framebuffer_reset_dirty(FrameBuffer *fb) {
+  PBL_ASSERTN(!gsize_equal(&fb->size, &GSizeZero));
+  fb->dirty_rect = GRectZero;
+  fb->is_dirty = false;
+}
+
+bool framebuffer_is_dirty(FrameBuffer *fb) {
+  PBL_ASSERTN(!gsize_equal(&fb->size, &GSizeZero));
+  return fb->is_dirty;
+}
+
+GSize framebuffer_get_size(FrameBuffer *fb) {
+  return fb->size;
+}