Replace factory generation of TextContexts with persistent objects.

src/gpu/GrTextContext.h

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrTextContext_DEFINED
 #define GrTextContext_DEFINED
 
 #include "GrPoint.h"
 #include "GrGlyph.h"
 #include "GrPaint.h"
 #include "SkDeviceProperties.h"
 
 #include "SkPostConfig.h"
 
 class GrContext;
 class GrDrawTarget;
 class GrFontScaler;
 
 /*
  * This class wraps the state for a single text render
  */
 class GrTextContext {
 public:
     virtual ~GrTextContext() {}
-    virtual void drawText(const char text[], size_t byteLength, SkScalar x, SkScalar y) = 0;
-    virtual void drawPosText(const char text[], size_t byteLength,
+    virtual void drawText(const GrPaint&, const SkPaint&, const char text[], size_t byteLength, 
+                          SkScalar x, SkScalar y) = 0;
+    virtual void drawPosText(const GrPaint&, const SkPaint&,
+                             const char text[], size_t byteLength,
                              const SkScalar pos[], SkScalar constY,
                              int scalarsPerPosition) = 0;
+
+    virtual bool canDraw(const SkPaint& paint) = 0;
     
 protected:
-    GrTextContext(GrContext*, const GrPaint&, const SkPaint&, const SkDeviceProperties&);
+    GrTextContext(GrContext*, const SkDeviceProperties&);
 
     static GrFontScaler* GetGrFontScaler(SkGlyphCache* cache);
     static void MeasureText(SkGlyphCache* cache, SkDrawCacheProc glyphCacheProc,
                             const char text[], size_t byteLength, SkVector* stopVector);
 
+    void init(const GrPaint&, const SkPaint&);
+    void finish() { fDrawTarget = NULL; }
+
     GrContext*         fContext;
+    SkDeviceProperties fDeviceProperties;
+
+    GrDrawTarget*      fDrawTarget;
+    SkIRect            fClipRect;
     GrPaint            fPaint;
     SkPaint            fSkPaint;
-    SkDeviceProperties fDeviceProperties;
-    GrDrawTarget*      fDrawTarget;
-
-    SkIRect            fClipRect;
-};
-
-/*
- * These classes wrap the creation of a single text context for a given GPU device. The
- * assumption is that we'll only be using one text context at a time for that device.
- */
-class GrTextContextManager {
-public:
-    virtual ~GrTextContextManager() {}
-    virtual GrTextContext* create(GrContext* grContext, const GrPaint& grPaint,
-                                  const SkPaint& skPaint, const SkDeviceProperties& props) = 0;
-    virtual bool canDraw(const SkPaint& paint, const SkMatrix& ctm) = 0;
-};
-
-template <class TextContextClass>
-class GrTTextContextManager : public GrTextContextManager {
-private:
-    class ManagedTextContext : public TextContextClass {
-    public:
-        virtual ~ManagedTextContext() {}
-
-        ManagedTextContext(GrContext* grContext,
-                           const GrPaint& grPaint,
-                           const SkPaint& skPaint,
-                           const SkDeviceProperties& properties,
-                           GrTTextContextManager<TextContextClass>* manager) :
-                          TextContextClass(grContext, grPaint, skPaint, properties) {
-            fManager = manager;
-        }
-
-        static void operator delete(void* ptr) {
-            if (ptr == NULL) {
-                return;
-            }
-            ManagedTextContext* context = reinterpret_cast<ManagedTextContext*>(ptr);
-            context->fManager->recycle(context);
-        }
-
-        static void operator delete(void*, void*) {
-        }
-
-        GrTTextContextManager<TextContextClass>* fManager;
-    };
-
-public:
-    GrTTextContextManager() {
-        fAllocation = sk_malloc_throw(sizeof(ManagedTextContext));
-        fUsed = false;
-    }
-
-    virtual ~GrTTextContextManager() {
-        SkASSERT(!fUsed);
-        sk_free(fAllocation);
-    }
-
-    virtual GrTextContext* create(GrContext* grContext, const GrPaint& grPaint,
-                                  const SkPaint& skPaint, const SkDeviceProperties& properties)
-                                 SK_OVERRIDE {
-        // add check for usePath here?
-        SkASSERT(!fUsed);
-        ManagedTextContext* obj = SkNEW_PLACEMENT_ARGS(fAllocation, ManagedTextContext,
-                                                       (grContext, grPaint, skPaint, properties,
-                                                        this));
-        fUsed = true;
-        return obj;
-    }
-
-    virtual bool canDraw(const SkPaint& paint, const SkMatrix& ctm) SK_OVERRIDE {
-        return TextContextClass::CanDraw(paint, ctm);
-    }
-
-private:
-    void recycle(GrTextContext* textContext) {
-        SkASSERT((void*)textContext == fAllocation);
-        SkASSERT(fUsed);
-        fUsed = false;
-    }
-
-    void* fAllocation;
-    bool  fUsed;
 };
 
 #endif