diff options
| -rw-r--r-- | engines/zvision/render_manager.cpp | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/engines/zvision/render_manager.cpp b/engines/zvision/render_manager.cpp index 1c1ce40c6c..a5c659d115 100644 --- a/engines/zvision/render_manager.cpp +++ b/engines/zvision/render_manager.cpp @@ -60,10 +60,6 @@ RenderManager::~RenderManager() { } void RenderManager::update(uint deltaTimeInMillis) { - // Clear the dirty rects from last frame - _workingWindowDirtyRect = Common::Rect(); - _backBufferDirtyRect = Common::Rect(); - // An inverse velocity of 0 would be infinitely fast, so we'll let 0 mean no velocity. if (_backgroundInverseVelocity != 0) { _accumulatedVelocityMilliseconds += deltaTimeInMillis; @@ -93,7 +89,14 @@ void RenderManager::renderBackbufferToScreen() { // Translate the working window dirty rect to screen coords _workingWindowDirtyRect.translate(_workingWindow.left, _workingWindow.top); // Then extend the backbuffer dirty rect to contain it - _backBufferDirtyRect.extend(_workingWindowDirtyRect); + if (_backBufferDirtyRect.isEmpty()) { + _backBufferDirtyRect = _workingWindowDirtyRect; + } else { + _backBufferDirtyRect.extend(_workingWindowDirtyRect); + } + + // Clear the dirty rect + _workingWindowDirtyRect = Common::Rect(); } // TODO: Add menu rendering @@ -103,6 +106,7 @@ void RenderManager::renderBackbufferToScreen() { if (!_backBufferDirtyRect.isEmpty()) { _system->copyRectToScreen(_backBuffer.getBasePtr(_backBufferDirtyRect.left, _backBufferDirtyRect.top), _backBuffer.pitch, _backBufferDirtyRect.left, _backBufferDirtyRect.top, _backBufferDirtyRect.width(), _backBufferDirtyRect.height()); + _backBufferDirtyRect = Common::Rect(); } } |