Don't re-render the display if nothing has changed

[ipdf/code.git] / src / view.cpp

diff --git a/src/view.cpp b/src/view.cpp
index c5a1841..d9227b4 100644 (file)
--- a/src/view.cpp
+++ b/src/view.cpp
@@ -13,7 +13,10 @@ void View::Translate(Real x, Real y)
        m_bounds.y += y;
        Debug("View Bounds => %s", m_bounds.Str().c_str());
        if (!m_use_gpu_transform)
-               m_bounds_dirty = true;
+       {
+               m_buffer_dirty = true;
+       }
+       m_bounds_dirty = true;
 }
 
 void View::ScaleAroundPoint(Real x, Real y, Real scaleAmt)
@@ -39,7 +42,8 @@ void View::ScaleAroundPoint(Real x, Real y, Real scaleAmt)
        m_bounds.h *= scaleAmt;
        Debug("View Bounds => %s", m_bounds.Str().c_str());
        if (!m_use_gpu_transform)
-               m_bounds_dirty = true;
+               m_buffer_dirty = true;
+       m_bounds_dirty = true;
 }
 
 Rect View::TransformToViewCoords(const Rect& inp) const
@@ -80,8 +84,22 @@ void View::DrawGrid()
 
 void glPrimitiveRestartIndex(GLuint index);
 
-void View::Render()
+void View::Render(int width, int height)
 {
+       if (width != m_cached_display.GetWidth() || height != m_cached_display.GetHeight())
+       {
+               m_cached_display.Create(width, height);
+               m_bounds_dirty = true;
+       }
+
+       if (!m_bounds_dirty)
+       {
+               m_cached_display.UnBind();
+               m_cached_display.Blit();
+               return;
+       }
+       m_cached_display.Bind();
+       m_cached_display.Clear();
        
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
@@ -94,7 +112,7 @@ void View::Render()
                glOrtho(0,1,1,0,-1,1);
        }
 
-       if (m_bounds_dirty)
+       if (m_buffer_dirty)
                ReRender();
 
        glMatrixMode(GL_MODELVIEW);
@@ -118,7 +136,8 @@ void View::Render()
        {
                glDisable(GL_BLEND);
        }
-
+       m_cached_display.UnBind();
+       m_cached_display.Blit();
 
 }