Introduce fractional scaling

backend/wayland/wl_seat.c

@@ -66,7 +66,8 @@ static void pointer_handle_motion(void *data, struct wl_pointer *wl_pointer,
 	box.y /= wlr_output->scale;
 
 	struct wlr_box layout_box;
-	wlr_wl_output_layout_get_box(wlr_wl_pointer->current_output->backend, &layout_box);
+	wlr_wl_output_layout_get_box(wlr_wl_pointer->current_output->backend,
+		&layout_box);
 
 	struct wlr_event_pointer_motion_absolute wlr_event;
 	wlr_event.device = dev;

include/rootston/config.h

@@ -9,7 +9,7 @@ struct roots_output_config {
 	char *name;
 	enum wl_output_transform transform;
 	int x, y;
-	int scale;
+	float scale;
 	struct wl_list link;
 	struct {
 		int width, height;

include/wlr/types/wlr_cursor.h

@@ -68,7 +68,7 @@ void wlr_cursor_move(struct wlr_cursor *cur, struct wlr_input_device *dev,
  */
 void wlr_cursor_set_image(struct wlr_cursor *cur, const uint8_t *pixels,
 	int32_t stride, uint32_t width, uint32_t height, int32_t hotspot_x,
-	int32_t hotspot_y, uint32_t scale);
+	int32_t hotspot_y, float scale);
 
 /**
  * Set the cursor surface. The surface can be committed to update the cursor

include/wlr/types/wlr_output.h

@@ -45,7 +45,7 @@ struct wlr_output {
 	char make[48];
 	char model[16];
 	char serial[16];
-	uint32_t scale;
+	float scale;
 	int32_t width, height;
 	int32_t phys_width, phys_height; // mm
 	enum wl_output_subpixel subpixel;
@@ -92,7 +92,7 @@ bool wlr_output_set_custom_mode(struct wlr_output *output, int32_t width,
 void wlr_output_set_transform(struct wlr_output *output,
 	enum wl_output_transform transform);
 void wlr_output_set_position(struct wlr_output *output, int32_t lx, int32_t ly);
-void wlr_output_set_scale(struct wlr_output *output, uint32_t scale);
+void wlr_output_set_scale(struct wlr_output *output, float scale);
 void wlr_output_destroy(struct wlr_output *output);
 void wlr_output_effective_resolution(struct wlr_output *output,
 	int *width, int *height);

include/wlr/types/wlr_xcursor_manager.h

@@ -9,7 +9,7 @@
  * A scaled XCursor theme.
  */
 struct wlr_xcursor_manager_theme {
-	uint32_t scale;
+	float scale;
 	struct wlr_xcursor_theme *theme;
 	struct wl_list link;
 };
@@ -38,10 +38,10 @@ struct wlr_xcursor_manager *wlr_xcursor_manager_create(const char *name,
 void wlr_xcursor_manager_destroy(struct wlr_xcursor_manager *manager);
 
 int wlr_xcursor_manager_load(struct wlr_xcursor_manager *manager,
-	uint32_t scale);
+	float scale);
 
 struct wlr_xcursor *wlr_xcursor_manager_get_xcursor(
-	struct wlr_xcursor_manager *manager, const char *name, uint32_t scale);
+	struct wlr_xcursor_manager *manager, const char *name, float scale);
 
 /**
  * Set a `wlr_cursor` image. The manager uses all currently loaded scaled

rootston/config.c

@@ -270,7 +270,7 @@ static int config_ini_handler(void *user, const char *section, const char *name,
 		} else if (strcmp(name, "y") == 0) {
 			oc->y = strtol(value, NULL, 10);
 		} else if (strcmp(name, "scale") == 0) {
-			oc->scale = strtol(value, NULL, 10);
+			oc->scale = strtof(value, NULL);
 			assert(oc->scale >= 1);
 		} else if (strcmp(name, "rotate") == 0) {
 			if (strcmp(value, "normal") == 0) {

rootston/seat.c

@@ -459,11 +459,10 @@ void roots_seat_configure_xcursor(struct roots_seat *seat) {
 
 	struct roots_output *output;
 	wl_list_for_each(output, &seat->input->server->desktop->outputs, link) {
-		if (wlr_xcursor_manager_load(seat->cursor->xcursor_manager,
-				output->wlr_output->scale)) {
+		float scale = output->wlr_output->scale;
+		if (wlr_xcursor_manager_load(seat->cursor->xcursor_manager, scale)) {
 			wlr_log(L_ERROR, "Cannot load xcursor theme for output '%s' "
-				"with scale %d", output->wlr_output->name,
-				output->wlr_output->scale);
+				"with scale %f", output->wlr_output->name, scale);
 		}
 	}
 

types/wlr_cursor.c

@@ -299,11 +299,11 @@ void wlr_cursor_move(struct wlr_cursor *cur, struct wlr_input_device *dev,
 
 void wlr_cursor_set_image(struct wlr_cursor *cur, const uint8_t *pixels,
 		int32_t stride, uint32_t width, uint32_t height, int32_t hotspot_x,
-		int32_t hotspot_y, uint32_t scale) {
+		int32_t hotspot_y, float scale) {
 	struct wlr_cursor_output_cursor *output_cursor;
 	wl_list_for_each(output_cursor, &cur->state->output_cursors, link) {
-		if (scale != 0 &&
-				output_cursor->output_cursor->output->scale != scale) {
+		float output_scale = output_cursor->output_cursor->output->scale;
+		if (scale > 0 && output_scale != scale) {
 			continue;
 		}
 

types/wlr_output.c

@@ -43,7 +43,7 @@ static void wl_output_send_to_resource(struct wl_resource *resource) {
 		}
 	}
 	if (version >= WL_OUTPUT_SCALE_SINCE_VERSION) {
-		wl_output_send_scale(resource, output->scale);
+		wl_output_send_scale(resource, (uint32_t)ceil(output->scale));
 	}
 	if (version >= WL_OUTPUT_DONE_SINCE_VERSION) {
 		wl_output_send_done(resource);
@@ -240,7 +240,7 @@ void wlr_output_set_position(struct wlr_output *output, int32_t lx,
 	}
 }
 
-void wlr_output_set_scale(struct wlr_output *output, uint32_t scale) {
+void wlr_output_set_scale(struct wlr_output *output, float scale) {
 	if (output->scale == scale) {
 		return;
 	}
@@ -256,6 +256,10 @@ void wlr_output_set_scale(struct wlr_output *output, uint32_t scale) {
 	wl_signal_emit(&output->events.scale, output);
 }
 
+uint32_t wlr_output_integral_scale(struct wlr_output *output) {
+	return ceil(output->scale);
+}
+
 void wlr_output_init(struct wlr_output *output, struct wlr_backend *backend,
 		const struct wlr_output_impl *impl) {
 	assert(impl->make_current && impl->swap_buffers && impl->transform);

types/wlr_xcursor_manager.c

@@ -33,7 +33,7 @@ void wlr_xcursor_manager_destroy(struct wlr_xcursor_manager *manager) {
 }
 
 int wlr_xcursor_manager_load(struct wlr_xcursor_manager *manager,
-		uint32_t scale) {
+		float scale) {
 	struct wlr_xcursor_manager_theme *theme;
 	wl_list_for_each(theme, &manager->scaled_themes, link) {
 		if (theme->scale == scale) {
@@ -56,7 +56,7 @@ int wlr_xcursor_manager_load(struct wlr_xcursor_manager *manager,
 }
 
 struct wlr_xcursor *wlr_xcursor_manager_get_xcursor(
-		struct wlr_xcursor_manager *manager, const char *name, uint32_t scale) {
+		struct wlr_xcursor_manager *manager, const char *name, float scale) {
 	struct wlr_xcursor_manager_theme *theme;
 	wl_list_for_each(theme, &manager->scaled_themes, link) {
 		if (theme->scale == scale) {