ZVISION: Add method to copy a portion of the working window to a surface

2 files changed, 15 insertions, 0 deletions

diff --git a/engines/zvision/render_manager.cpp b/engines/zvision/render_manager.cpp
index 04163fab61..38807a7457 100644
--- a/engines/zvision/render_manager.cpp
+++ b/engines/zvision/render_manager.cpp
@@ -311,6 +311,20 @@ void RenderManager::copyRectToWorkingWindow(const uint16 *buffer, int32 destX, i
 		sourceOffset += imageWidth;
 	}
 
+void RenderManager::copyWorkingWindowSubRectToSurface(Graphics::Surface *destSurface, uint16 destX, uint16 destY, Common::Rect subRect) const {
+	uint32 destOffset = 0;
+	uint32 sourceOffset = 0;
+	uint16 *workingWindowBufferPtr = (uint16 *)_workingWindowBuffer.getBasePtr(subRect.left, subRect.top);
+	uint16 *destPtr = (uint16 *)destSurface->getBasePtr(destX, destY);
+
+	for (int32 y = 0; y < subRect.height(); y++) {
+		for (int32 x = 0; x < subRect.width(); x++) {
+			destPtr[destOffset + x] = workingWindowBufferPtr[sourceOffset + x];
+		}
+
+		destOffset += destSurface->w;
+		sourceOffset += _workingWidth;
+	}
 	_workingWindowDirtyRect.extend(Common::Rect(destX, destY, destX + width, destY + height));
 }
 
diff --git a/engines/zvision/render_manager.h b/engines/zvision/render_manager.h
index 51636ef682..ce5c774917 100644
--- a/engines/zvision/render_manager.h
+++ b/engines/zvision/render_manager.h
@@ -194,6 +194,7 @@ public:
 	RenderTable *getRenderTable();
 	uint32 getCurrentBackgroundOffset();
 	const Graphics::Surface *getBackBuffer() { return &_backBuffer; }
+	void copyWorkingWindowSubRectToSurface(Graphics::Surface *destSurface, uint16 destX, uint16 destY, Common::Rect subRect) const;
 
 	/**
 	 * Creates a copy of surface and transposes the data.