modules/rtv: add captions

The idea is to have captions similar to how MTV did back in the 80s.

It'd be nice to make the text resolution independent, but this is a
good first stab for an afternoon of tooling around.

1 files changed, 37 insertions, 5 deletions

diff --git a/src/modules/rtv/rtv.c b/src/modules/rtv/rtv.c
index 8848e82..215f5d2 100644
--- a/src/modules/rtv/rtv.c
+++ b/src/modules/rtv/rtv.c
@@ -3,6 +3,7 @@
 
 #include "fb.h"
 #include "rototiller.h"
+#include "txt/txt.h"
 #include "util.h"
 
 /* Copyright (C) 2019 - Vito Caputo <vcaputo@pengaru.com> */
@@ -24,16 +25,18 @@
  *   same thing over and over.
  */
 
-#define RTV_SNOW_DURATION_SECS	1
-#define RTV_DURATION_SECS	15
+#define RTV_SNOW_DURATION_SECS		1
+#define RTV_DURATION_SECS		15
+#define RTV_CAPTION_DURATION_SECS	5
 
 typedef struct rtv_context_t {
 	const rototiller_module_t	**modules;
 	size_t				n_modules;
 
-	time_t				next_switch;
+	time_t				next_switch, next_hide_caption;
 	const rototiller_module_t	*module;
 	void				*module_ctxt;
+	txt_t				*caption;
 
 	const rototiller_module_t	*snow_module;
 } rtv_context_t;
@@ -69,6 +72,7 @@ static void setup_next_module(rtv_context_t *ctxt)
 			ctxt->module->destroy_context(ctxt->module_ctxt);
 
 		ctxt->module_ctxt = NULL;
+		ctxt->caption = txt_free(ctxt->caption);
 	}
 
 	if (ctxt->module != ctxt->snow_module) {
@@ -82,7 +86,15 @@ static void setup_next_module(rtv_context_t *ctxt)
 			 ctxt->modules[i] == ctxt->snow_module);
 
 		ctxt->module = ctxt->modules[i];
+
+		ctxt->caption = txt_newf("Title: %s\nAuthor: %s\nDescription: %s\nLicense: %s",
+					 ctxt->module->name,
+					 ctxt->module->author,
+					 ctxt->module->description,
+					 ctxt->module->license);
+
 		ctxt->next_switch = time(NULL) + RTV_DURATION_SECS;
+		ctxt->next_hide_caption = time(NULL) + RTV_CAPTION_DURATION_SECS;
 	}
 
 	if (ctxt->module->create_context)
@@ -111,15 +123,35 @@ static void rtv_destroy_context(void *context)
 static void rtv_prepare_frame(void *context, unsigned n_cpus, fb_fragment_t *fragment, rototiller_fragmenter_t *res_fragmenter)
 {
 	rtv_context_t	*ctxt = context;
+	time_t		now = time(NULL);
 
-	if (time(NULL) >= ctxt->next_switch)
+	if (now >= ctxt->next_switch)
 		setup_next_module(ctxt);
 
+	if (now >= ctxt->next_hide_caption)
+		ctxt->caption = txt_free(ctxt->caption);
+
 	rototiller_module_render(ctxt->module, ctxt->module_ctxt, fragment);
 }
 
 
 static void rtv_finish_frame(void *context, fb_fragment_t *fragment)
 {
-	/* TODO: this is stubbed here for drawing the caption overlay */
+	rtv_context_t	*ctxt = context;
+
+	if (!ctxt->caption)
+		return;
+
+	txt_render_fragment(ctxt->caption, fragment, 0x00000000,
+			    1, fragment->frame_height + 1,
+			    (txt_align_t){
+					.horiz = TXT_HALIGN_LEFT,
+					.vert = TXT_VALIGN_BOTTOM
+			    });
+	txt_render_fragment(ctxt->caption, fragment, 0xffffffff,
+			    0, fragment->frame_height,
+			    (txt_align_t){
+				.horiz = TXT_HALIGN_LEFT,
+				.vert = TXT_VALIGN_BOTTOM
+			    });
 }