WII: Abuse pollEvent() to update the screen of skipped frames.

updateScreen() itself skips redraws when called too frequently. With
the right timing and number of consecutive calls this can result in
missing gfx updates, so lets abuse pollEvent() to check for overdue
redraws.

svn-id: r52456

3 files changed, 20 insertions, 0 deletions

diff --git a/backends/platform/wii/osystem.h b/backends/platform/wii/osystem.h
index eaaf616538..ed33b43a81 100644
--- a/backends/platform/wii/osystem.h
+++ b/backends/platform/wii/osystem.h
@@ -117,6 +117,7 @@ private:
 	void deinitGfx();
 	void updateScreenResolution();
 	void switchVideoMode(int mode);
+	bool needsScreenUpdate();
 
 	void initSfx();
 	void deinitSfx();
diff --git a/backends/platform/wii/osystem_events.cpp b/backends/platform/wii/osystem_events.cpp
index 488834fc20..5d0bca453f 100644
--- a/backends/platform/wii/osystem_events.cpp
+++ b/backends/platform/wii/osystem_events.cpp
@@ -300,6 +300,9 @@ bool OSystem_Wii::pollEvent(Common::Event &event) {
 		return true;
 	}
 
+	if (needsScreenUpdate())
+		updateScreen();
+
 	u32 bd = 0, bh = 0, bu = 0;
 
 	if (PAD_ScanPads() & 1) {
diff --git a/backends/platform/wii/osystem_gfx.cpp b/backends/platform/wii/osystem_gfx.cpp
index 3ce6343800..09575bb83d 100644
--- a/backends/platform/wii/osystem_gfx.cpp
+++ b/backends/platform/wii/osystem_gfx.cpp
@@ -441,6 +441,22 @@ void OSystem_Wii::copyRectToScreen(const byte *buf, int pitch, int x, int y,
 	_gameDirty = true;
 }
 
+bool OSystem_Wii::needsScreenUpdate() {
+	if (getMillis() - _lastScreenUpdate < 1000 / MAX_FPS)
+		return false;
+
+	if (_gameRunning && _gameDirty)
+		return true;
+
+	if (_overlayVisible && _overlayDirty)
+		return true;
+
+	if (_mouseVisible && _texMouse.palette && _cursorPaletteDirty)
+		return true;
+
+	return false;
+}
+
 void OSystem_Wii::updateScreen() {
 	static f32 ar;
 	static gfx_screen_coords_t cc;