ZVISION: Create method for transposing a surface

2 files changed, 29 insertions, 0 deletions

diff --git a/engines/zvision/render_manager.cpp b/engines/zvision/render_manager.cpp
index 8ac07632d6..441580c1bc 100644
--- a/engines/zvision/render_manager.cpp
+++ b/engines/zvision/render_manager.cpp
@@ -432,4 +432,22 @@ uint32 RenderManager::getCurrentBackgroundOffset() {
 	}
 }
 
+Graphics::Surface *RenderManager::tranposeSurface(const Graphics::Surface *surface) {
+	Graphics::Surface *tranposedSurface = new Graphics::Surface();
+	tranposedSurface->create(surface->h, surface->w, surface->format);
+
+	uint16 *source = (uint16 *)surface->getPixels();
+	uint16 *dest = (uint16 *)tranposedSurface->getPixels();
+
+	for (uint32 y = 0; y < tranposedSurface->h; y++) {
+		uint32 columnIndex = y * tranposedSurface->w;
+
+		for (uint32 x = 0; x < tranposedSurface->w; x++) {
+			dest[columnIndex + x] = source[x * surface->w + y];
+		}
+	}
+
+	return tranposedSurface;
+}
+
 } // End of namespace ZVision
diff --git a/engines/zvision/render_manager.h b/engines/zvision/render_manager.h
index cbf69b9df2..51636ef682 100644
--- a/engines/zvision/render_manager.h
+++ b/engines/zvision/render_manager.h
@@ -195,6 +195,17 @@ public:
 	uint32 getCurrentBackgroundOffset();
 	const Graphics::Surface *getBackBuffer() { return &_backBuffer; }
 
+	/**
+	 * Creates a copy of surface and transposes the data.
+	 *
+	 * Note: The user is responsible for calling free() on the returned surface
+	 * and then deleting it
+	 *
+	 * @param surface    The data to be transposed
+	 * @return           A copy of the surface with the data transposed
+	 */
+	static Graphics::Surface *tranposeSurface(const Graphics::Surface *surface);
+
 private:
 	/**
 	 * Renders a subRectangle of an image to the backbuffer. The destinationRect and SubRect