1 files changed, 300 insertions, 0 deletions
diff --git a/swaynag/render.c b/swaynag/render.c
new file mode 100644
index 00000000..150ae3f2
--- /dev/null
+++ b/swaynag/render.c
@@ -0,0 +1,300 @@
+#include <stdint.h>
+#include "cairo.h"
+#include "log.h"
+#include "pango.h"
+#include "pool-buffer.h"
+#include "swaynag/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)(ideal_height - text_height) / 2);
+	pango_printf(cairo, nagbar->font, nagbar->scale, true, "%s",
+			nagbar->message);
+
+	return ideal_height;
+}
+
+static void render_details_scroll_button(cairo_t *cairo,
+		struct sway_nagbar *nagbar, struct sway_nagbar_button *button) {
+	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;
+
+	cairo_set_source_u32(cairo, nagbar->colors.border);
+	cairo_rectangle(cairo, button->x, button->y,
+			button->width, button->height);
+	cairo_fill(cairo);
+
+	cairo_set_source_u32(cairo, nagbar->colors.button_background);
+	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.text);
+	cairo_move_to(cairo, button->x + border + padding,
+			button->y + border + (button->height - text_height) / 2);
+	pango_printf(cairo, nagbar->font, nagbar->scale, true, "%s", button->text);
+}
+
+static int get_detailed_scroll_button_width(cairo_t *cairo,
+		struct sway_nagbar *nagbar) {
+	int up_width, down_width, temp_height;
+	get_text_size(cairo, nagbar->font, &up_width, &temp_height,
+			nagbar->scale, true, "%s", nagbar->details.button_up.text);
+	get_text_size(cairo, nagbar->font, &down_width, &temp_height,
+			nagbar->scale, true, "%s", nagbar->details.button_down.text);
+
+	int text_width =  up_width > down_width ? up_width : down_width;
+	int border = NAGBAR_BUTTON_BORDER_THICKNESS * nagbar->scale;
+	int padding = NAGBAR_BUTTON_PADDING * nagbar->scale;
+
+	return text_width + border * 2 + padding * 2;
+}
+
+static uint32_t render_detailed(cairo_t *cairo, struct sway_nagbar *nagbar,
+		uint32_t y) {
+	uint32_t width = nagbar->width * nagbar->scale;
+	uint32_t height = nagbar->height * nagbar->scale;
+	height -= NAGBAR_BAR_BORDER_THICKNESS * nagbar->scale;
+
+	int border = NAGBAR_DETAILS_BORDER_THICKNESS * nagbar->scale;
+	int padding = NAGBAR_MESSAGE_PADDING * nagbar->scale;
+	int decor = padding + border;
+
+	nagbar->details.x = decor;
+	nagbar->details.y = y + decor;
+	nagbar->details.width = width - decor * 2;
+
+	PangoLayout *layout = get_pango_layout(cairo, nagbar->font,
+			nagbar->details.message, nagbar->scale, true);
+	pango_layout_set_width(layout,
+			(nagbar->details.width - padding * 2) * PANGO_SCALE);
+	pango_layout_set_wrap(layout, PANGO_WRAP_WORD_CHAR);
+	pango_layout_set_single_paragraph_mode(layout, false);
+	pango_cairo_update_layout(cairo, layout);
+	nagbar->details.total_lines = pango_layout_get_line_count(layout);
+
+	PangoLayoutLine *line;
+	line = pango_layout_get_line_readonly(layout, nagbar->details.offset);
+	gint offset = line->start_index;
+	const char *text = pango_layout_get_text(layout);
+	pango_layout_set_text(layout, text + offset, strlen(text) - offset);
+
+	int text_width, text_height;
+	pango_cairo_update_layout(cairo, layout);
+	pango_layout_get_pixel_size(layout, &text_width, &text_height);
+
+	bool show_buttons = nagbar->details.offset > 0;
+	int button_width = get_detailed_scroll_button_width(cairo, nagbar);
+	if (show_buttons) {
+		nagbar->details.width -= button_width;
+		pango_layout_set_width(layout,
+				(nagbar->details.width - padding * 2) * PANGO_SCALE);
+	}
+
+	uint32_t ideal_height;
+	do {
+		ideal_height = nagbar->details.y + text_height + decor + padding * 2;
+		if (ideal_height > NAGBAR_MAX_HEIGHT) {
+			ideal_height = NAGBAR_MAX_HEIGHT;
+
+			if (!show_buttons) {
+				show_buttons = true;
+				nagbar->details.width -= button_width;
+				pango_layout_set_width(layout,
+						(nagbar->details.width - padding * 2) * PANGO_SCALE);
+			}
+		}
+
+		nagbar->details.height = ideal_height - nagbar->details.y - decor;
+		pango_layout_set_height(layout,
+				(nagbar->details.height - padding * 2) * PANGO_SCALE);
+		pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
+		pango_cairo_update_layout(cairo, layout);
+		pango_layout_get_pixel_size(layout, &text_width, &text_height);
+	} while (text_height != (nagbar->details.height - padding * 2));
+
+	nagbar->details.visible_lines = pango_layout_get_line_count(layout);
+
+	if (show_buttons) {
+		nagbar->details.button_up.x =
+			nagbar->details.x + nagbar->details.width;
+		nagbar->details.button_up.y = nagbar->details.y;
+		nagbar->details.button_up.width = button_width;
+		nagbar->details.button_up.height = nagbar->details.height / 2;
+		render_details_scroll_button(cairo, nagbar,
+				&nagbar->details.button_up);
+
+		nagbar->details.button_down.x =
+			nagbar->details.x + nagbar->details.width;
+		nagbar->details.button_down.y =
+			nagbar->details.button_up.y + nagbar->details.button_up.height;
+		nagbar->details.button_down.width = button_width;
+		nagbar->details.button_down.height = nagbar->details.height / 2;
+		render_details_scroll_button(cairo, nagbar,
+				&nagbar->details.button_down);
+	}
+
+	cairo_set_source_u32(cairo, nagbar->colors.border);
+	cairo_rectangle(cairo, nagbar->details.x, nagbar->details.y,
+			nagbar->details.width, nagbar->details.height);
+	cairo_fill(cairo);
+
+	cairo_move_to(cairo, nagbar->details.x + padding,
+			nagbar->details.y + padding);
+	cairo_set_source_u32(cairo, nagbar->colors.text);
+	pango_cairo_show_layout(cairo, layout);
+	g_object_unref(layout);
+
+	return ideal_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)(ideal_height - text_height) / 2 - 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 ideal_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;
+		}
+	}
+
+	if (nagbar->details.visible) {
+		h = render_detailed(cairo, nagbar, max_height);
+		max_height = h > max_height ? h : max_height;
+	}
+
+	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;
+}
+
+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);
+		if (!nagbar->current_buffer) {
+			wlr_log(WLR_DEBUG, "Failed to get buffer. Skipping frame.");
+			goto cleanup;
+		}
+
+		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);
+	}
+
+cleanup:
+	cairo_surface_destroy(recorder);
+	cairo_destroy(cairo);
+}