Add another paging mode to onscreen debug output. Activated by pressing "t" it

will show the next page after a timeout of 3 seconds instead of waiting for a key
to be pressed. This allows you to enjoy onscreen debug output even when you only
have a USB keyboard. Should be enough time to take a quick look or take a photo.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@31814 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/kernel/debug/blue_screen.cpp

@@ -49,6 +49,7 @@ struct screen_info {
 	bool	reverse_attr;
 	int32	in_command_rows;
 	bool	paging;
+	bool	paging_timeout;
 	bool	boot_debug_output;
 	bool	ignore_output;
 
@@ -121,6 +122,9 @@ next_line(void)
 	if (sScreen.paging && ((sScreen.in_command_rows > 0
 			&& ((sScreen.in_command_rows + 3) % sScreen.rows) == 0)
 		|| (sScreen.boot_debug_output && sScreen.y == sScreen.rows - 1))) {
+		if (sScreen.paging_timeout)
+			spin(1000 * 1000 * 3);
+		else {
 			// Use the paging mechanism: either, we're in the debugger, and a
 			// command is being executed, or we're currently showing boot debug
 			// output
@@ -148,11 +152,14 @@ next_line(void)
 				sScreen.ignore_output = true;
 			} else if (c == 'p' && !in_command_invocation())
 				sScreen.paging = false;
+			else if (c == 't' && !in_command_invocation())
+				sScreen.paging_timeout = true;
 
 			// remove on screen text again
 			sModule->fill_glyph(sScreen.columns - length, sScreen.y, length,
 				1, ' ', sScreen.attr);
 		}
+	}
 	if (sScreen.y == sScreen.rows - 1) {
 		sScreen.y = 0;
 		sModule->fill_glyph(0, 0, sScreen.columns, 2, ' ', sScreen.attr);
@@ -580,6 +587,7 @@ blue_screen_init(void)
 
 	sModule = &gFrameBufferConsoleModule;
 	sScreen.paging = true;
+	sScreen.paging_timeout = false;
 
 	add_debugger_command("paging", set_paging, "Enable or disable paging");
 	return B_OK;