From bbaa7f5a81cfaf26f3d5dd51edb38cf56284cb41 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Sun, 19 Sep 2021 20:10:28 +0200
Subject: Offsets are now calculated during arranging

---
 text.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/text.c b/text.c
index 6e3da86..3f65048 100644
--- a/text.c
+++ b/text.c
@@ -72,6 +72,7 @@ struct Layout
 {
 	PangoFontDescription * desc;
 	int size;
+	int * offsets;
 	PangoLayout ** v;
 };
 
@@ -211,6 +212,7 @@ void finalize(struct State * state, struct Layout * layout)
 	for (int i = 0; i < layout->size; ++i)
 		g_object_unref(layout->v[i]);
 	free(layout->v);
+	free(layout->offsets);
 	cairo_destroy(state->ctx);
 	cairo_surface_destroy(state->surface);
 	xcb_disconnect(state->c);
@@ -332,8 +334,9 @@ void arrange(struct State * state, struct Layout * layout, union Command body[])
 	{
 		for (int i = 0; i < layout->size; ++i)
 			g_object_unref(layout->v[i]);
-		layout->v = malloc(sizeof(PangoLayout *) * size);
-		if (NULL == layout->v)
+		layout->v = malloc(sizeof(PangoLayout *) * size);  // TODO: Free when changing data
+		layout->offsets = malloc(sizeof(int) * size);
+		if (NULL == layout->v || NULL == layout->offsets)
 			abort();  // TODO: Be more graceful?
 		for (int i = 0; i < size; ++i)
 			layout->v[i] = pango_cairo_create_layout(state->ctx);
@@ -341,6 +344,7 @@ void arrange(struct State * state, struct Layout * layout, union Command body[])
 	}
 	PangoAttrList * attrs = pango_attr_list_new();
 	int i = 0;
+	int offset = MARGIN;
 	for (union Command * c = body; COMMAND_DONE != c->type; ++c)
 	{
 		switch (c->type)
@@ -368,6 +372,10 @@ void arrange(struct State * state, struct Layout * layout, union Command body[])
 			pango_layout_set_wrap(layout->v[i], PANGO_WRAP_WORD);
 			pango_layout_set_width(layout->v[i], (state->width - 2 * MARGIN) * PANGO_SCALE);
 			pango_layout_set_text(layout->v[i], c->block.data, c->block.length);
+			int height;
+			pango_layout_get_pixel_size(layout->v[i], NULL, &height);
+			layout->offsets[i] = offset;
+			offset += height + MARGIN;
 			i++;
 			break;
 		case COMMAND_NOTHING:
@@ -384,15 +392,11 @@ void draw(struct State * state, struct Layout * layout)
 	cairo_set_source_rgb(state->ctx, 1., 1., 1.);
 	cairo_paint(state->ctx);
 	cairo_set_source_rgb(state->ctx, 0., 0., 0.);
-	int y = MARGIN;
 	for (int i = 0; i < layout->size; ++i)
 	{
-		cairo_move_to(state->ctx, MARGIN, y);
+		cairo_move_to(state->ctx, MARGIN, layout->offsets[i]);
 		pango_cairo_update_layout(state->ctx, layout->v[i]);
 		pango_cairo_show_layout(state->ctx, layout->v[i]);
-		int height;
-		pango_layout_get_pixel_size(layout->v[i], NULL, &height);
-		y += height + MARGIN;
 	}
 	cairo_surface_flush(state->surface);
 	xcb_flush(state->c);
-- 
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