Implements swaynagbar

1 files changed, 152 insertions, 0 deletions

diff --git a/swaynagbar/render.c b/swaynagbar/render.c
new file mode 100644
index 00000000..c0f59298
--- /dev/null
+++ b/swaynagbar/render.c
@@ -0,0 +1,152 @@
+#include <stdint.h>
+#include "cairo.h"
+#include "log.h"
+#include "pango.h"
+#include "pool-buffer.h"
+#include "swaynagbar/nagbar.h"
+#include "wlr-layer-shell-unstable-v1-client-protocol.h"
+
+static uint32_t render_message(cairo_t *cairo, struct sway_nagbar *nagbar) {
+	uint32_t height = nagbar->height * nagbar->scale;
+	height -= NAGBAR_BAR_BORDER_THICKNESS * nagbar->scale;
+
+	int text_width, text_height;
+	get_text_size(cairo, nagbar->font, &text_width, &text_height,
+			nagbar->scale, true, "%s", nagbar->message);
+
+	int padding = NAGBAR_MESSAGE_PADDING * nagbar->scale;
+
+	uint32_t ideal_height = text_height + padding * 2;
+	uint32_t ideal_surface_height = ideal_height / nagbar->scale;
+	if (nagbar->height < ideal_surface_height) {
+		return ideal_surface_height;
+	}
+
+	cairo_set_source_u32(cairo, nagbar->colors.text);
+	cairo_move_to(cairo, padding, (int)(height / 2.0 - text_height / 2.0));
+	pango_printf(cairo, nagbar->font, nagbar->scale, true, "%s",
+			nagbar->message);
+
+	return nagbar->height;
+}
+
+static uint32_t render_button(cairo_t *cairo, struct sway_nagbar *nagbar,
+		int button_index, int *x) {
+	uint32_t height = nagbar->height * nagbar->scale;
+	height -= NAGBAR_BAR_BORDER_THICKNESS * nagbar->scale;
+	struct sway_nagbar_button *button = nagbar->buttons->items[button_index];
+
+	int text_width, text_height;
+	get_text_size(cairo, nagbar->font, &text_width, &text_height,
+			nagbar->scale, true, "%s", button->text);
+
+	int border = NAGBAR_BUTTON_BORDER_THICKNESS * nagbar->scale;
+	int padding = NAGBAR_BUTTON_PADDING * nagbar->scale;
+
+	uint32_t ideal_height = text_height + padding * 2 + border * 2;
+	uint32_t ideal_surface_height = ideal_height / nagbar->scale;
+	if (nagbar->height < ideal_surface_height) {
+		return ideal_surface_height;
+	}
+
+	button->x = *x - border - text_width - padding * 2;
+	button->y = (int)(height / 2.0 - text_height / 2.0) - padding;
+	button->width = text_width + padding * 2;
+	button->height = text_height + padding * 2;
+
+	cairo_set_source_u32(cairo, nagbar->colors.border);
+	cairo_rectangle(cairo, button->x - border, button->y - border,
+			button->width + border * 2, button->height + border * 2);
+	cairo_fill(cairo);
+
+	cairo_set_source_u32(cairo, nagbar->colors.button_background);
+	cairo_rectangle(cairo, button->x, button->y,
+			button->width, button->height);
+	cairo_fill(cairo);
+
+	cairo_set_source_u32(cairo, nagbar->colors.text);
+	cairo_move_to(cairo, button->x + padding, button->y + padding);
+	pango_printf(cairo, nagbar->font, nagbar->scale, true, "%s", button->text);
+
+	*x = button->x - border;
+
+	return nagbar->height;
+}
+
+static uint32_t render_to_cairo(cairo_t *cairo, struct sway_nagbar *nagbar) {
+	uint32_t max_height = 0;
+
+	cairo_set_operator(cairo, CAIRO_OPERATOR_SOURCE);
+	cairo_set_source_u32(cairo, nagbar->colors.background);
+	cairo_paint(cairo);
+
+	uint32_t h = render_message(cairo, nagbar);
+	max_height = h > max_height ? h : max_height;
+
+	int x = (nagbar->width - NAGBAR_BUTTON_MARGIN_RIGHT) * nagbar->scale;
+	for (int i = 0; i < nagbar->buttons->length; i++) {
+		h = render_button(cairo, nagbar, i, &x);
+		max_height = h > max_height ? h : max_height;
+		x -= NAGBAR_BUTTON_GAP * nagbar->scale;
+		if (i == 0) {
+			x -= NAGBAR_BUTTON_GAP_CLOSE * nagbar->scale;
+		}
+	}
+
+	int border = NAGBAR_BAR_BORDER_THICKNESS * nagbar->scale;
+	if (max_height > nagbar->height) {
+		max_height += border;
+	}
+	cairo_set_source_u32(cairo, nagbar->colors.border_bottom);
+	cairo_rectangle(cairo, 0, nagbar->height * nagbar->scale - border,
+			nagbar->width * nagbar->scale, border);
+	cairo_fill(cairo);
+
+	return max_height > nagbar->height ? max_height : nagbar->height;
+}
+
+void render_frame(struct sway_nagbar *nagbar) {
+	if (!nagbar->run_display) {
+		return;
+	}
+
+	cairo_surface_t *recorder = cairo_recording_surface_create(
+			CAIRO_CONTENT_COLOR_ALPHA, NULL);
+	cairo_t *cairo = cairo_create(recorder);
+	cairo_save(cairo);
+	cairo_set_operator(cairo, CAIRO_OPERATOR_CLEAR);
+	cairo_paint(cairo);
+	cairo_restore(cairo);
+	uint32_t height = render_to_cairo(cairo, nagbar);
+	if (height != nagbar->height) {
+		zwlr_layer_surface_v1_set_size(nagbar->layer_surface, 0, height);
+		zwlr_layer_surface_v1_set_exclusive_zone(nagbar->layer_surface,
+				height);
+		wl_surface_commit(nagbar->surface);
+		wl_display_roundtrip(nagbar->display);
+	} else {
+		nagbar->current_buffer = get_next_buffer(nagbar->shm,
+				nagbar->buffers,
+				nagbar->width * nagbar->scale,
+				nagbar->height * nagbar->scale);
+		cairo_t *shm = nagbar->current_buffer->cairo;
+
+		cairo_save(shm);
+		cairo_set_operator(shm, CAIRO_OPERATOR_CLEAR);
+		cairo_paint(shm);
+		cairo_restore(shm);
+
+		cairo_set_source_surface(shm, recorder, 0.0, 0.0);
+		cairo_paint(shm);
+
+		wl_surface_set_buffer_scale(nagbar->surface, nagbar->scale);
+		wl_surface_attach(nagbar->surface,
+				nagbar->current_buffer->buffer, 0, 0);
+		wl_surface_damage(nagbar->surface, 0, 0,
+				nagbar->width, nagbar->height);
+		wl_surface_commit(nagbar->surface);
+		wl_display_roundtrip(nagbar->display);
+	}
+	cairo_surface_destroy(recorder);
+	cairo_destroy(cairo);
+}