Make GrTextContext be owned by the GrDrawContext

include/gpu/GrContext.h

Index: include/gpu/GrContext.h
diff --git a/include/gpu/GrContext.h b/include/gpu/GrContext.h
index acd7b1ad911ee3e1ce92d5f40a8e846fdc66f243..97d2f8258d1b2bdd61ba745772a698e16cd25a48 100644
--- a/include/gpu/GrContext.h
+++ b/include/gpu/GrContext.h
@@ -43,7 +43,6 @@ class GrTextureParams;
 class GrVertexBuffer;
 class GrStrokeInfo;
 class GrSoftwarePathRenderer;
-class SkGpuDevice;
 
 class SK_API GrContext : public SkRefCnt {
 public:
@@ -175,10 +174,13 @@ public:
     /**
      * Returns a helper object to orchestrate draws. 

[reed1, 2015/06/10 15:10:45]

I presume there is no ownership change w/ this? i.e. the caller doesn't need to
delete or unref anything?

[robertphillips, 2015/06/10 15:17:44]

Done - added some comments.

      *
+     * @param  devProps the device properties (mainly defines text drawing)
+     * @param  uesDFT should Distance Field Text be used?
+     *
      * @return a draw context
      */
-    GrDrawContext* drawContext() {
-        return fDrawingMgr.drawContext();    
+    GrDrawContext* drawContext(const SkDeviceProperties* devProps = NULL, bool useDFT = false) {
+        return fDrawingMgr.drawContext(devProps, useDFT);    
     }
 
     ///////////////////////////////////////////////////////////////////////////
@@ -390,15 +392,17 @@ private:
     GrContext(); // init must be called after the constructor.
     bool init(GrBackend, GrBackendContext, const GrContextOptions& options);
 
-    // Currently the DrawingMgr just wraps the single GrDrawTarget in a single
-    // GrDrawContext and hands it out. In the future this class will allocate
-    // a new GrDrawContext for each GrRenderTarget/GrDrawTarget and manage
-    // the DAG.
+    // Currently the DrawingMgr stores a separate GrDrawContext for each
+    // combination of text drawing options (pixel geometry x DFT use)
+    // and hands the appropriate one back given the user's request.
+    // All of the GrDrawContexts still land in the same GrDrawTarget!
+    //
+    // In the future this class will allocate a new GrDrawContext for 
+    // each GrRenderTarget/GrDrawTarget and manage the DAG.
     class DrawingMgr {
     public:
-        DrawingMgr()
-            : fDrawTarget(NULL)
-            , fDrawContext(NULL) {
+        DrawingMgr() : fDrawTarget(NULL) {
+            sk_bzero(fDrawContext, sizeof(fDrawContext));
         }
 
         ~DrawingMgr();
@@ -414,14 +418,18 @@ private:
 
         // Callers should take a ref if they rely on the GrDrawContext sticking around.
         // NULL will be returned if the context has been abandoned.
-        GrDrawContext* drawContext();
+        GrDrawContext* drawContext(const SkDeviceProperties* devProps, bool useDFT);
 
     private:
         friend class GrContext;  // for access to fDrawTarget for testing
 
+        static const int kNumPixelGeometries = 5; // The different pixel geometries
+        static const int kNumDFTOptions = 2;      // DFT or no DFT
+
+        GrContext*        fContext;
         GrDrawTarget*     fDrawTarget;
 
-        GrDrawContext*    fDrawContext;
+        GrDrawContext*    fDrawContext[kNumPixelGeometries][kNumDFTOptions];
     };
 
     DrawingMgr                      fDrawingMgr;
@@ -430,18 +438,6 @@ private:
     void initCommon();
 
     /**
-     * Creates a new text rendering context that is optimal for the
-     * render target and the context. Caller assumes the ownership
-     * of the returned object. The returned object must be deleted
-     * before the context is destroyed.
-     * TODO bury this behind context!
-     */
-    GrTextContext* createTextContext(GrRenderTarget*,
-                                     const SkDeviceProperties&,
-                                     bool enableDistanceFieldFonts);
-
-
-    /**
      * These functions create premul <-> unpremul effects if it is possible to generate a pair
      * of effects that make a readToUPM->writeToPM->readToUPM cycle invariant. Otherwise, they
      * return NULL.
@@ -461,9 +457,6 @@ private:
      */
     static void TextBlobCacheOverBudgetCB(void* data);
 
-    // TODO see note on createTextContext
-    friend class SkGpuDevice;
-
     typedef SkRefCnt INHERITED;
 };