ZVISION: Create method for clipping a rect to the working window

2 files changed, 19 insertions, 0 deletions

diff --git a/engines/zvision/render_manager.cpp b/engines/zvision/render_manager.cpp
index c0554dc20a..8ac07632d6 100644
--- a/engines/zvision/render_manager.cpp
+++ b/engines/zvision/render_manager.cpp
@@ -351,6 +351,17 @@ const Common::Point RenderManager::imageSpaceToWorkingWindowSpace(const Common::
 	return newPoint;
 }
 
+bool RenderManager::clipRectToWorkingWindow(Common::Rect &rect) {
+	if (!_workingWindow.contains(rect)) {
+		return false;
+	}
+
+	// We can't clip against the actual working window rect because it's in screen space
+	// But rect is in working window space
+	rect.clip(_workingWidth, _workingHeight);
+	return true;
+}
+
 RenderTable *RenderManager::getRenderTable() {
 	return &_renderTable;
 }
diff --git a/engines/zvision/render_manager.h b/engines/zvision/render_manager.h
index 0294d6a19f..cbf69b9df2 100644
--- a/engines/zvision/render_manager.h
+++ b/engines/zvision/render_manager.h
@@ -182,6 +182,14 @@ public:
 	 */
 	const Common::Point imageSpaceToWorkingWindowSpace(const Common::Point &point);
 
+	/**
+	 * Clip a rectangle to the working window. If it returns false, the original rect
+	 * is not inside the working window.
+	 *
+	 * @param rect    The rectangle to clip against the working window
+	 * @return        Is rect at least partially inside the working window (true) or completely outside (false)
+	 */
+	bool clipRectToWorkingWindow(Common::Rect &rect);
 
 	RenderTable *getRenderTable();
 	uint32 getCurrentBackgroundOffset();