From c2edca6d7bf25ab7598aa5e44f6ae03942c33df5 Mon Sep 17 00:00:00 2001
From: gazer <makhotkin_viktor@bk.ru>
Date: Fri, 29 Jan 2016 11:03:39 +0300
Subject: [PATCH] a little optimization

---
 src/dlangui/graphics/gldrawbuf.d   |  5 +----
 src/dlangui/platforms/sdl/sdlapp.d | 16 ++++++++--------
 2 files changed, 9 insertions(+), 12 deletions(-)

diff --git a/src/dlangui/graphics/gldrawbuf.d b/src/dlangui/graphics/gldrawbuf.d
index 2cca3ed5..73c28fa6 100644
--- a/src/dlangui/graphics/gldrawbuf.d
+++ b/src/dlangui/graphics/gldrawbuf.d
@@ -46,10 +46,8 @@ class GLDrawBuf : DrawBuf, GLConfigCallback {
     @property Scene scene() { return _scene; }
 
     this(int dx, int dy, bool framebuffer = false) {
-        _dx = dx;
-        _dy = dy;
+        resize(dx, dy);
         _framebuffer = framebuffer;
-        resetClipping();
     }
 
     /// returns current width
@@ -65,7 +63,6 @@ class GLDrawBuf : DrawBuf, GLConfigCallback {
 
     /// reserved for hardware-accelerated drawing - begins drawing batch
     override void beforeDrawing() {
-        resetClipping();
         _alpha = 0;
         if (_scene !is null) {
             _scene.reset();
diff --git a/src/dlangui/platforms/sdl/sdlapp.d b/src/dlangui/platforms/sdl/sdlapp.d
index 421a4375..a16e07db 100644
--- a/src/dlangui/platforms/sdl/sdlapp.d
+++ b/src/dlangui/platforms/sdl/sdlapp.d
@@ -422,12 +422,13 @@ class SDLWindow : Window {
                 float b = ((_backgroundColor >> 0) & 255) / 255.0f;
                 glClearColor(r, g, b, a);
                 glClear(GL_COLOR_BUFFER_BIT);
-                GLDrawBuf buf = new GLDrawBuf(_dx, _dy, false);
-                buf.beforeDrawing();
-                onDraw(buf);
-                buf.afterDrawing();
+                if (!_drawbuf)
+                    _drawbuf = new GLDrawBuf(_dx, _dy);
+                _drawbuf.resize(_dx, _dy);
+                _drawbuf.beforeDrawing();
+                onDraw(_drawbuf);
+                _drawbuf.afterDrawing();
                 SDL_GL_SwapWindow(_win);
-                destroy(buf);
             }
         } else {
             // Select the color for drawing.
@@ -441,10 +442,9 @@ class SDLWindow : Window {
             if (!_drawbuf)
                 _drawbuf = new ColorDrawBuf(_dx, _dy);
             _drawbuf.resize(_dx, _dy);
-            _drawbuf.resetClipping();
             _drawbuf.fill(_backgroundColor);
             onDraw(_drawbuf);
-            draw(_drawbuf);
+            draw(cast(ColorDrawBuf)_drawbuf);
 
             // Up until now everything was drawn behind the scenes.
             // This will show the new, red contents of the window.
@@ -452,7 +452,7 @@ class SDLWindow : Window {
         }
     }
 
-    ColorDrawBuf _drawbuf;
+    DrawBuf _drawbuf;
 
     //bool _exposeSent;
     void processExpose() {