pinephone-sway-poc/patches/lisgd.patch

diff --git a/lisgd.c b/lisgd.c
index 9d3442b..af49a80 100644
--- a/lisgd.c
+++ b/lisgd.c
@@ -1,3 +1,4 @@
+#include <stdbool.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <libinput.h>
@@ -86,6 +87,51 @@ touchmotion(struct libinput_event *e)
 	yend[slot] = libinput_event_touch_get_y(tevent);
 }
 
+bool display_rotation_matches(char* transform) {
+	char cmd[256];
+	snprintf(cmd, sizeof(cmd),
+		"swaymsg -t get_outputs | grep DSI-1 -A 50 | grep transform | grep %s",
+	 	transform);
+	return system(cmd) == 0;
+}
+
+enum rotation{normal, left, right, invert};
+enum rotation get_display_rotation()
+{
+	if (display_rotation_matches("normal"))
+		return normal;
+	if (display_rotation_matches("90"))
+		return left;
+	if (display_rotation_matches("180"))
+		return invert;
+	if (display_rotation_matches("270"))
+		return right;
+	return normal;
+}
+
+void rotate_move_based_on_display(int* move_x, int* move_y)
+{
+	enum rotation rot = get_display_rotation();
+	int t;
+	switch (get_display_rotation()) {
+		case normal:
+			break;
+		case left:
+			t = *move_x;
+			(*move_x) = (*move_y);
+			(*move_y) = -t;
+			break;
+		case right:
+			t = *move_x;
+			(*move_x) = -(*move_y);
+			(*move_y) = t;
+			break;
+		case invert:
+			(*move_y) = -(*move_y);
+			break;
+	}
+}
+
 void
 touchup(struct libinput_event *e)
 {
@@ -109,19 +155,27 @@ touchup(struct libinput_event *e)
 		);
 	}
 
-	if (xend[slot] > xstart[slot] && fabs(xend[slot] - xstart[slot]) > threshold) {
-		start = Left;
-		end = Right;
-	} else if (xend[slot] < xstart[slot] && fabs(xend[slot] - xstart[slot]) > threshold) {
-		start = Right;
-		end = Left;
-	} else if (yend[slot] > ystart[slot] && fabs(yend[slot] - ystart[slot]) > threshold) {
-		start = Up;
-		end = Down;
-	} else if (yend[slot] < ystart[slot] && fabs(yend[slot] - ystart[slot]) > threshold) {
-		start = Down;
-		end = Up;
-	} else {
+	int move_x = fabs(xend[slot] - xstart[slot]) > threshold
+		? (xend[slot] > xstart[slot] ? 1 : -1) : 0;
+	int move_y = fabs(yend[slot] - ystart[slot]) > threshold
+		? (yend[slot] > ystart[slot] ? 1 : -1) : 0;
+
+	rotate_move_based_on_display(&move_x, &move_y);
+
+#define X_DIR 4
+#define Y_DIR 1
+#define NODIR 0
+	switch (move_x * X_DIR + move_y * Y_DIR) {
+	    case -X_DIR -Y_DIR: start = Right; end = Up;    break;
+	    case -X_DIR +NODIR: start = Right; end = Left;  break;
+	    case -X_DIR +Y_DIR: start = Right; end = Down;  break;
+	    case +NODIR -Y_DIR: start = Down;  end = Up;    break;
+	    case +NODIR +Y_DIR: start = Up;    end = Down;  break;
+	    case +X_DIR -Y_DIR: start = Left;  end = Up;    break;
+	    case +X_DIR +NODIR: start = Left;  end = Right; break;
+	    case +X_DIR +Y_DIR: start = Left;  end = Down;  break;
+	    case +NODIR +NODIR:
+	    default:
 		if (verbose) {
 			fprintf(stderr, "Input didn't match a known gesture\n");
 		}