PEGASUS: Implement dirty rect erase code (as used by the space chase)

1 files changed, 13 insertions, 0 deletions

diff --git a/engines/pegasus/graphics.cpp b/engines/pegasus/graphics.cpp
index cc6dcf04a8..06db31f71d 100644
--- a/engines/pegasus/graphics.cpp
+++ b/engines/pegasus/graphics.cpp
@@ -45,6 +45,7 @@ GraphicsManager::GraphicsManager(PegasusEngine *vm) : _vm(vm) {
 	_workArea.create(640, 480, _vm->_system->getScreenFormat());
 	_modifiedScreen = false;
 	_curSurface = &_workArea;
+	_erase = false;
 }
 	
 GraphicsManager::~GraphicsManager() {
@@ -150,6 +151,10 @@ void GraphicsManager::updateDisplay() {
 	bool screenDirty = false;
 
 	if (!_dirtyRect.isEmpty()) {
+		// Fill the dirty area with black if erase mode is enabled
+		if (_erase)
+			_workArea.fillRect(_dirtyRect, _workArea.format.RGBToColor(0, 0, 0));
+
 		for (DisplayElement *runner = _firstDisplayElement; runner != 0; runner = runner->_nextElement) {
 			Common::Rect bounds;
 			runner->getBounds(bounds);
@@ -320,5 +325,13 @@ void GraphicsManager::shakeTheWorld(TimeValue duration, TimeScale scale) {
 
 	oldScreen.free();
 }
+
+void GraphicsManager::enableErase() {
+	_erase = true;
+}
+
+void GraphicsManager::disableErase() {
+	_erase = false;
+}
 	
 } // End of namespace Pegasus