Optimization for text drawing on OpenGL

Only call glBindTexture() if the glyph cache texture is not already
bound. This can potentially give performance improvement of around 30%.

Reviewed-by: Gunnar

1 files changed, 3 insertions, 1 deletions

diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h b/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
index c60eac1..7108741 100644
--- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
+++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2_p.h
@@ -176,7 +176,8 @@ public:
             useSystemClip(true),
             snapToPixelGrid(false),
             addOffset(false),
-            inverseScale(1)
+            inverseScale(1),
+            lastMaskTextureUsed(0)
     { }
 
     ~QGL2PaintEngineExPrivate();
@@ -278,6 +279,7 @@ public:
     GLfloat inverseScale;
 
     GLuint lastTextureUsed;
+    GLuint lastMaskTextureUsed;
 
     bool needsSync;
     bool multisamplingAlwaysEnabled;