--- Screen.pm	2007/08/05 15:16:10	150
+++ Screen.pm	2007/08/06 07:04:40	165
@@ -14,7 +14,7 @@
 use Data::Dump qw/dump/;
 
 use Exporter 'import';
-our @EXPORT = qw'$white $black';
+our @EXPORT = qw'$white $black @flip';
 
 use base qw(Class::Accessor Prefs);
 __PACKAGE__->mk_accessors(qw(app event));
@@ -23,6 +23,33 @@
 
 Screen - simulated 256*256 pixels monochrome screen using SDL
 
+=head1 Architecture dependent
+
+You may override following methods if you want to implement keyboard on each
+keypress event. Alternative is to use <read> hook and trap memory access.
+
+=head2 key_down
+
+  $self->key_down( 'a' );
+
+=cut
+
+sub key_down {}
+
+=head2 key_up
+
+  $self->key_up( 'a' );
+
+=cut
+
+sub key_up {}
+
+
+=head1 Architecture independent
+
+You don't need to override any of following function in your architecture,
+but you might want to call them.
+
 =head2 open_screen
 
 Open simulated screen
@@ -49,7 +76,7 @@
 	);
 	#$app->grab_input( SDL_GRAB_QUERY );
 	$app->grab_input( SDL_GRAB_OFF );
-	$app->title( ref($self) . ' ' . $self::VERSION );
+	$app->title( ref($self) );
 
 	$self->app( $app );
 
@@ -220,15 +247,6 @@
 my $pending_key;
 my $run_for = 2000;
 
-my $key_down;
-
-sub key_down {
-	my $self = shift;
-	my $key = shift;
-	warn "key_down($key) = ",$key_down->{$key}, "\n" if $self->debug;
-	return $key_down->{$key};
-}
-
 sub key_pressed {
 	my $self = shift;
 
@@ -238,12 +256,15 @@
 	my $event = $self->event || confess "no event?";
 
 	if ( ! $event->poll ) {
+		return $pending_key unless $self->can('session_event');
 		if ( my $h = $self->session_event('key_pressed') ) {
 			my ( $key, $state ) = %$h;
 			if ( $state ) {
 				$pending_key = $key;
+				$self->key_down( $key );
 			} else {
 				undef $pending_key;
+				$self->key_up( $key );
 			}
 		}
 		return $pending_key;
@@ -257,7 +278,6 @@
 
 	if ($type == SDL_KEYDOWN) {
 		$k = $event->key_name();
-		$key_down->{$k}++;
 		if ( $k eq 'escape' ) {
 			$run_for = $self->cli;
 			warn "will check event loop every $run_for cycles\n";
@@ -265,13 +285,14 @@
 		} else {
 			warn "SDL_KEYDOWN ($type) = '$k'", $just_checking ? ' fake' : '', "\n";
 			$pending_key = $k;
+			$self->key_down( $k );
 			$self->record_session('key_pressed', { $k => 1 });
 		}
 	} elsif ( $type == SDL_KEYUP ) {
 		my $up = $event->key_name();
 		warn "SDL_KEYUP ($type) = '$up'", $just_checking ? ' fake' : '', "\n";
+		$self->key_up( $up );
 		$self->record_session('key_pressed', { $up => 0 });
-		$key_down->{$up} = 0;
 		undef $pending_key;
 	}
 
@@ -305,6 +326,23 @@
 	}
 }
 
+# helper array to flip bytes for display
+our @flip;
+
+foreach my $i ( 0 .. 255 ) {
+	my $t = 0;
+	$i & 0b00000001 and $t = $t | 0b10000000;
+	$i & 0b00000010 and $t = $t | 0b01000000;
+	$i & 0b00000100 and $t = $t | 0b00100000;
+	$i & 0b00001000 and $t = $t | 0b00010000;
+	$i & 0b00010000 and $t = $t | 0b00001000;
+	$i & 0b00100000 and $t = $t | 0b00000100;
+	$i & 0b01000000 and $t = $t | 0b00000010;
+	$i & 0b10000000 and $t = $t | 0b00000001;
+	#warn "$i = $t\n";
+	$flip[$i] = $t;
+}
+
 =head1 SEE ALSO
 
 L<Orao> is sample implementation using this module