From e6d6284517ade1e71c9962909c1268cbfd5b6f9e Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Tue, 7 Sep 2021 20:07:38 +0200
Subject: Expanded input to drawing function

---
 text.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 60 insertions(+), 17 deletions(-)

diff --git a/text.c b/text.c
index 17a6cbd..b89b72a 100644
--- a/text.c
+++ b/text.c
@@ -9,12 +9,35 @@
 #include <xcb/xcb.h>
 #include <xcb/xcb_util.h>
 
+enum CommandType
+{
+	COMMAND_NOTHING,
+	COMMAND_DONE,
+	COMMAND_BLOCK,
+	COMMAND_SPAN,
+};
+
+union Command
+{
+	int type;
+	struct {
+		int type;
+		int length;
+		const char * data;
+	} block;
+	struct {
+		int type;
+		int position;
+		int length;
+	} span;
+};
+
 int init_x(void);
-void draw_text(cairo_t *, const char *);
+void draw_body(cairo_t *);
 xcb_visualtype_t * find_visual(xcb_screen_t *);
 
 static const int MARGIN = 20;
-static const char * const FONT = "Serif 34";
+static const char * const FONT = "Serif 16";
 
 static int width = 800;
 static int height = 600;
@@ -24,12 +47,23 @@ static xcb_screen_t * s;
 static xcb_visualtype_t * v;
 static xcb_window_t w;
 
+#define _BLOCK(_txt) {.block = {.type = COMMAND_BLOCK, .length = sizeof(_txt) - 1, .data = _txt}}
+union Command body[] = {
+	_BLOCK(
+		"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam auctor porta eros at tempus. Aliquam "
+		"elementum lectus id mi fermentum, non consectetur urna lobortis."
+	),
+	{.span = {.type = COMMAND_SPAN, .position = 27, .length = 11}},
+	_BLOCK("Phasellus dignissim rhoncus magna at imperdiet."),
+	{.type = COMMAND_DONE},
+};
+#undef _BLOCK
+
 
 int main(int argc, const char ** argv)
 {
-	const char * text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.";
-	if (2 == argc)
-		text = argv[2];
+	(void) argc;
+	(void) argv;
 	const int res = init_x();
 	if (-1 == res)
 		return 1;
@@ -54,8 +88,7 @@ int main(int argc, const char ** argv)
 		case XCB_EXPOSE:
 			cairo_set_source_rgb(ctx, 1., 1., 1.);
 			cairo_paint(ctx);
-			cairo_set_source_rgb(ctx, 0., 0., 0.);
-			draw_text(ctx, text);
+			draw_body(ctx);
 			cairo_surface_flush(surface);
 			xcb_flush(c);
 			break;
@@ -116,17 +149,27 @@ xcb_visualtype_t * find_visual(xcb_screen_t * screen)
 }
 
 
-void draw_text(cairo_t * ctx, const char * text)
+void draw_body(cairo_t * ctx)
 {
-	cairo_move_to(ctx, MARGIN, MARGIN);
-	PangoLayout * layout = pango_cairo_create_layout(ctx);
 	PangoFontDescription * desc = pango_font_description_from_string(FONT);
-	pango_layout_set_font_description(layout, desc);
+	cairo_set_source_rgb(ctx, 0., 0., 0.);
+	int y = MARGIN;
+	for (union Command * command = body; COMMAND_DONE != command->type; ++command)
+	{
+		if (COMMAND_SPAN == command->type)
+			continue;
+		cairo_move_to(ctx, MARGIN, y);
+		PangoLayout * layout = pango_cairo_create_layout(ctx);
+		pango_layout_set_font_description(layout, desc);
+		pango_layout_set_wrap(layout, PANGO_WRAP_WORD);
+		pango_layout_set_width(layout, (width - 2 * MARGIN) * PANGO_SCALE);
+		pango_layout_set_text(layout, command->block.data, command->block.length);
+		pango_cairo_update_layout(ctx, layout);
+		pango_cairo_show_layout(ctx, layout);
+		int height;
+		pango_layout_get_pixel_size(layout, NULL, &height);
+		y += height + MARGIN;
+		g_object_unref(layout);
+	}
 	pango_font_description_free(desc);
-	pango_layout_set_text(layout, text, -1);
-	pango_layout_set_wrap(layout, PANGO_WRAP_WORD);
-	pango_layout_set_width(layout, (width - 2 * MARGIN) * PANGO_SCALE);
-	pango_cairo_update_layout(ctx, layout);
-	pango_cairo_show_layout(ctx, layout);
-	g_object_unref(layout);
 }
-- 
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