Plumb in flag for reusing scratch textures

include/gpu/GrContext.h

Index: include/gpu/GrContext.h
===================================================================
--- include/gpu/GrContext.h	(revision 10125)
+++ include/gpu/GrContext.h	(working copy)
@@ -47,7 +47,7 @@
     /**
      * Creates a GrContext for a backend context.
      */

[robertphillips, 2013/07/17 16:51:32]

An option would be to pass in a tri-value enum (e.g., reuse, don't, default).

-    static GrContext* Create(GrBackend, GrBackendContext);
+    static GrContext* Create(GrBackend, GrBackendContext, bool* reuseScratchTextures = NULL);
 
     /**
      * Returns the number of GrContext instances for the current thread.
@@ -85,6 +85,15 @@
     }
 
     /**
+     * Change the context's scratch texture reuse behavior. On some platforms
+     * reusing scratch textures can cause the driver to ghost the texture 
+     * which, in excess, can lead to out of memory problems
+     */

[robertphillips, 2013/07/17 16:51:32]

This would remain a bool

+    void setReuseScratchTextures(bool reuseScratchTextures) { 
+        fReuseScratchTextures = reuseScratchTextures; 
+    }
+
+    /**
      * Abandons all GPU resources, assumes 3D API state is unknown. Call this
      * if you have lost the associated GPU context, and thus internal texture,
      * buffer, etc. references/IDs are now invalid. Should be called even when
@@ -867,6 +876,8 @@
     int                             fPMToUPMConversion;
     int                             fUPMToPMConversion;
 

[robertphillips, 2013/07/17 16:51:32]

This would remain a bool

+    bool                            fReuseScratchTextures;
+
     struct CleanUpData {
         PFCleanUpFunc fFunc;
         void*         fInfo;
@@ -875,7 +886,7 @@
     SkTDArray<CleanUpData>      fCleanUpData;
 
     GrContext(); // init must be called after the constructor.

[robertphillips, 2013/07/17 16:51:32]

This would also become tri-value

-    bool init(GrBackend, GrBackendContext);
+    bool init(GrBackend, GrBackendContext, bool *reuseScratchTextures);
 
     void setupDrawBuffer();