Import of the watch repository from Pebble

src/fw/applib/graphics/graphics_circle_private.h

@@ -0,0 +1,56 @@
+/*
+ * 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 "gtypes.h"
+
+// For arc/radial fill algorithms
+#define QUADRANTS_NUM 4 // Just in case of fluctuation
+#define QUADRANT_ANGLE (TRIG_MAX_ANGLE / QUADRANTS_NUM)
+
+static GCornerMask radius_quadrants[QUADRANTS_NUM] =
+{ GCornerTopRight, GCornerBottomRight, GCornerBottomLeft, GCornerTopLeft };
+
+typedef struct {
+  int32_t angle;
+  GCornerMask quadrant;
+} EllipsisPartDrawConfig;
+
+typedef struct {
+  EllipsisPartDrawConfig start_quadrant;
+  GCornerMask full_quadrants;
+  EllipsisPartDrawConfig end_quadrant;
+} EllipsisDrawConfig;
+
+typedef struct {
+  GCornerMask mask;
+  int8_t x_mul;
+  int8_t y_mul;
+} GCornerMultiplier;
+
+static GCornerMultiplier quadrant_mask_mul[] = {
+  {GCornerTopRight,     1, -1},
+  {GCornerBottomRight,  1,  1},
+  {GCornerBottomLeft,  -1,  1},
+  {GCornerTopLeft,     -1, -1}
+};
+
+T_STATIC EllipsisDrawConfig prv_calc_draw_config_ellipsis(int32_t angle_start, int32_t angle_end);
+
+void prv_fill_oval_quadrant(GContext *ctx, GPoint point,
+                            uint16_t outer_radius_x, uint16_t outer_radius_y,
+                            uint16_t inner_radius_x, uint16_t inner_radius_y,
+                            GCornerMask quadrant);