swaybar, swaylock, & tree/container: Set cairo font options to render text and lines with subpixel hinting (if available).

common/cairo.c

@@ -13,6 +13,22 @@ void cairo_set_source_u32(cairo_t *cairo, uint32_t color) {
 			(color >> (0*8) & 0xFF) / 255.0);
 }
 
+cairo_subpixel_order_t to_cairo_subpixel_order(enum wl_output_subpixel subpixel) {
+	switch (subpixel) {
+	case WL_OUTPUT_SUBPIXEL_HORIZONTAL_RGB:
+		return CAIRO_SUBPIXEL_ORDER_RGB;
+	case WL_OUTPUT_SUBPIXEL_HORIZONTAL_BGR:
+		return CAIRO_SUBPIXEL_ORDER_BGR;
+	case WL_OUTPUT_SUBPIXEL_VERTICAL_RGB:
+		return CAIRO_SUBPIXEL_ORDER_VRGB;
+	case WL_OUTPUT_SUBPIXEL_VERTICAL_BGR:
+		return CAIRO_SUBPIXEL_ORDER_VBGR;
+	default:
+		return CAIRO_SUBPIXEL_ORDER_DEFAULT;
+	}
+	return CAIRO_SUBPIXEL_ORDER_DEFAULT;
+}
+
 cairo_surface_t *cairo_image_surface_scale(cairo_surface_t *image,
 		int width, int height) {
 	int image_width = cairo_image_surface_get_width(image);

include/cairo.h

@@ -2,8 +2,10 @@
 #define _SWAY_CAIRO_H
 #include <stdint.h>
 #include <cairo/cairo.h>
+#include <wlr/types/wlr_output.h>
 
 void cairo_set_source_u32(cairo_t *cairo, uint32_t color);
+cairo_subpixel_order_t to_cairo_subpixel_order(enum wl_output_subpixel subpixel);
 
 cairo_surface_t *cairo_image_surface_scale(cairo_surface_t *image,
 		int width, int height);

include/swaybar/bar.h

@@ -81,6 +81,7 @@ struct swaybar_output {
 
 	uint32_t width, height;
 	int32_t scale;
+	enum wl_output_subpixel subpixel;
 	struct pool_buffer buffers[2];
 	struct pool_buffer *current_buffer;
 };

include/swaylock/swaylock.h

@@ -82,6 +82,7 @@ struct swaylock_surface {
 	bool frame_pending, dirty;
 	uint32_t width, height;
 	int32_t scale;
+	enum wl_output_subpixel subpixel;
 	char *output_name;
 	struct wl_list link;
 };

sway/tree/container.c

@@ -465,11 +465,17 @@ static void update_title_texture(struct sway_container *con,
 	cairo_surface_t *surface = cairo_image_surface_create(
 			CAIRO_FORMAT_ARGB32, width, height);
 	cairo_t *cairo = cairo_create(surface);
+	cairo_set_antialias(cairo, CAIRO_ANTIALIAS_BEST);
+	cairo_font_options_t *fo = cairo_font_options_create();
+	cairo_font_options_set_hint_style(fo, CAIRO_HINT_STYLE_FULL);
+	cairo_font_options_set_antialias(fo, CAIRO_ANTIALIAS_SUBPIXEL);
+	cairo_font_options_set_subpixel_order(fo, to_cairo_subpixel_order(output->wlr_output->subpixel));
+	cairo_set_font_options(cairo, fo);
+	cairo_font_options_destroy(fo);
 	cairo_set_source_rgba(cairo, class->background[0], class->background[1],
 			class->background[2], class->background[3]);
 	cairo_paint(cairo);
 	PangoContext *pango = pango_cairo_create_context(cairo);
-	cairo_set_antialias(cairo, CAIRO_ANTIALIAS_BEST);
 	cairo_set_source_rgba(cairo, class->text[0], class->text[1],
 			class->text[2], class->text[3]);
 	cairo_move_to(cairo, 0, 0);

swaybar/bar.c

@@ -319,10 +319,14 @@ static bool bar_uses_output(struct swaybar *bar, const char *name) {
 	return false;
 }
 
-static void output_geometry(void *data, struct wl_output *output, int32_t x,
+static void output_geometry(void *data, struct wl_output *wl_output, int32_t x,
 		int32_t y, int32_t width_mm, int32_t height_mm, int32_t subpixel,
 		const char *make, const char *model, int32_t transform) {
-	// Who cares
+	struct swaybar_output *output = data;
+	output->subpixel = subpixel;
+	if (output->surface) {
+		render_frame(output->bar, output);
+	}
 }
 
 static void output_mode(void *data, struct wl_output *output, uint32_t flags,

swaybar/render.c

@@ -495,6 +495,13 @@ void render_frame(struct swaybar *bar, struct swaybar_output *output) {
 	cairo_surface_t *recorder = cairo_recording_surface_create(
 			CAIRO_CONTENT_COLOR_ALPHA, NULL);
 	cairo_t *cairo = cairo_create(recorder);
+	cairo_set_antialias(cairo, CAIRO_ANTIALIAS_BEST);
+	cairo_font_options_t *fo = cairo_font_options_create();
+	cairo_font_options_set_hint_style(fo, CAIRO_HINT_STYLE_FULL);
+	cairo_font_options_set_antialias(fo, CAIRO_ANTIALIAS_SUBPIXEL);
+	cairo_font_options_set_subpixel_order(fo, to_cairo_subpixel_order(output->subpixel));
+	cairo_set_font_options(cairo, fo);
+	cairo_font_options_destroy(fo);
 	cairo_save(cairo);
 	cairo_set_operator(cairo, CAIRO_OPERATOR_CLEAR);
 	cairo_paint(cairo);

swaylock/main.c

@@ -195,11 +195,15 @@ void damage_state(struct swaylock_state *state) {
 	}
 }
 
-static void handle_wl_output_geometry(void *data, struct wl_output *output,
+static void handle_wl_output_geometry(void *data, struct wl_output *wl_output,
 		int32_t x, int32_t y, int32_t width_mm, int32_t height_mm,
 		int32_t subpixel, const char *make, const char *model,
 		int32_t transform) {
-	// Who cares
+	struct swaylock_surface *surface = data;
+	surface->subpixel = subpixel;
+	if (surface->state->run_display) {
+		damage_surface(surface);
+	}
 }
 
 static void handle_wl_output_mode(void *data, struct wl_output *output,

swaylock/render.c

@@ -39,6 +39,13 @@ void render_frame(struct swaylock_surface *surface) {
 	}
 
 	cairo_t *cairo = surface->current_buffer->cairo;
+	cairo_set_antialias(cairo, CAIRO_ANTIALIAS_BEST);
+	cairo_font_options_t *fo = cairo_font_options_create();
+	cairo_font_options_set_hint_style(fo, CAIRO_HINT_STYLE_FULL);
+	cairo_font_options_set_antialias(fo, CAIRO_ANTIALIAS_SUBPIXEL);
+	cairo_font_options_set_subpixel_order(fo, to_cairo_subpixel_order(surface->subpixel));
+	cairo_set_font_options(cairo, fo);
+	cairo_font_options_destroy(fo);
 	cairo_identity_matrix(cairo);
 
 	cairo_save(cairo);