Add GrResourceProviderPriv and expose GrGpu in it

Bug: skia:
Change-Id: Iad965ecf33c9dc75c4f068d547698d973f52eb94
Reviewed-on: https://skia-review.googlesource.com/91440
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>

3 files changed, 47 insertions, 0 deletions

diff --git a/gn/gpu.gni b/gn/gpu.gni
index f203437832..f41dc4ae45 100644
--- a/gn/gpu.gni
+++ b/gn/gpu.gni
@@ -169,6 +169,7 @@ skia_gpu_sources = [
   "$_src/gpu/GrResourceHandle.h",
   "$_src/gpu/GrResourceProvider.cpp",
   "$_src/gpu/GrResourceProvider.h",
+  "$_src/gpu/GrResourceProviderPriv.h",
   "$_src/gpu/GrScissorState.h",
   "$_src/gpu/GrSemaphore.h",
   "$_src/gpu/GrShaderCaps.cpp",
diff --git a/src/gpu/GrResourceProvider.h b/src/gpu/GrResourceProvider.h
index f7f7850b31..64c9a8bea3 100644
--- a/src/gpu/GrResourceProvider.h
+++ b/src/gpu/GrResourceProvider.h
@@ -20,6 +20,7 @@ class GrBackendTexture;
 class GrGpu;
 class GrPath;
 class GrRenderTarget;
+class GrResourceProviderPriv;
 class GrSemaphore;
 class GrSingleOwner;
 class GrStencilAttachment;
@@ -275,6 +276,9 @@ public:
     const GrCaps* caps() const { return fCaps.get(); }
     bool overBudget() const { return fCache->overBudget(); }
 
+    inline GrResourceProviderPriv priv();
+    inline const GrResourceProviderPriv priv() const;
+
 private:
     sk_sp<GrGpuResource> findResourceByUniqueKey(const GrUniqueKey&);
 
@@ -291,6 +295,9 @@ private:
     GrResourceCache* cache() { return fCache; }
     const GrResourceCache* cache() const { return fCache; }
 
+    friend class GrResourceProviderPriv;
+
+    // Method made available via GrResourceProviderPriv
     GrGpu* gpu() { return fGpu; }
     const GrGpu* gpu() const { return fGpu; }
 
diff --git a/src/gpu/GrResourceProviderPriv.h b/src/gpu/GrResourceProviderPriv.h
new file mode 100644
index 0000000000..d7d73d86ca
--- /dev/null
+++ b/src/gpu/GrResourceProviderPriv.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2018 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrResourceProviderPriv_DEFINED
+#define GrResourceProviderPriv_DEFINED
+
+#include "GrResourceProvider.h"
+
+/** Class that adds methods to GrResourceProvider that are only intended for use internal to Skia.
+    This class is purely a privileged window into GrResourceProvider. It should never have
+    additional data members or virtual methods. */
+class GrResourceProviderPriv {
+public:
+    GrGpu* gpu() { return fResourceProvider->gpu(); }
+
+private:
+    explicit GrResourceProviderPriv(GrResourceProvider* provider) : fResourceProvider(provider) {}
+    GrResourceProviderPriv(const GrResourceProviderPriv&); // unimpl
+    GrResourceProviderPriv& operator=(const GrResourceProviderPriv&); // unimpl
+
+    // No taking addresses of this type.
+    const GrResourceProviderPriv* operator&() const;
+    GrResourceProviderPriv* operator&();
+
+    GrResourceProvider* fResourceProvider;
+    friend class GrResourceProvider; // to construct/copy this type
+};
+
+inline GrResourceProviderPriv GrResourceProvider::priv() { return GrResourceProviderPriv(this); }
+
+inline const GrResourceProviderPriv GrResourceProvider::priv() const {
+    return GrResourceProviderPriv(const_cast<GrResourceProvider*>(this));
+}
+
+#endif