From 7c290476afd877cf4be48f458a6d2666a2562c8c Mon Sep 17 00:00:00 2001
From: Alexander Sulfrian <alexander@sulfrian.net>
Date: Mon, 17 Sep 2012 01:37:56 +0200
Subject: menu/background_*: vertices are only recalculated if the size changed

The size of the parent component is cached by the backgrounds and the
vertices to draw the backgrounds are only calculated again, if the
size of the parent component changed.
---
 src/menu/background_image.hpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'src/menu/background_image.hpp')

diff --git a/src/menu/background_image.hpp b/src/menu/background_image.hpp
index 23b1a68e..8b28a2e3 100644
--- a/src/menu/background_image.hpp
+++ b/src/menu/background_image.hpp
@@ -31,6 +31,7 @@
 #include "background.hpp"
 #include "texture.hpp"
 #include "utils/disposer.hpp"
+#include "utils/dimension.hpp"
 
 namespace usdx
 {
@@ -46,8 +47,26 @@ namespace usdx
 		 */
 		Disposer<Texture>* texture;
 
+		/**
+		 * Vertices to draw the background rectangle filled with the
+		 * texture. Cached until size of the parent component changes.
+		 *
+		 * @see updateVertices()
+		 */
 		GLint vertices[8];
 
+		/**
+		 * Cache for the size of the parent component, to be able to detect
+		 * changes.
+		 */
+		Dimension<int> size;
+
+		/**
+		 * Update the vertices for drawing the background, if the size if the
+		 * parent component changes.
+		 */
+		void updateVertices();
+
 	protected:
 		void draw(void);
 
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