Add Gr*Proxy classes

src/gpu/GrTextureProxy.cpp

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrTextureProxy.h"
+
+#include "GrTextureProvider.h"
+#include "GrGpuResourcePriv.h"
+
+GrTextureProxy::GrTextureProxy(sk_sp<GrTexture> tex)
+    : INHERITED(tex->desc(), SkBackingFit::kExact, tex->resourcePriv().isBudgeted())
+    , fTexture(std::move(tex)) {
+}
+
+GrTexture* GrTextureProxy::instantiate(GrTextureProvider* texProvider) {
+    if (fTexture) {
+        return fTexture.get();
+    }
+
+    if (SkBackingFit::kApprox == fFit) {
+        fTexture.reset(texProvider->createApproxTexture(fDesc));
+    } else {
+        fTexture.reset(texProvider->createTexture(fDesc, fBudgeted));
+    }
+
+    return fTexture.get();
+}
+
+sk_sp<GrTextureProxy> GrTextureProxy::Make(const GrSurfaceDesc& desc,
+                                           SkBackingFit fit,
+                                           SkBudgeted budgeted,
+                                           const void* srcData,
+                                           size_t rowBytes) {
+    // TODO: handle 'srcData' (we could use the wrapped version if there is data)
+    SkASSERT(!srcData && !rowBytes);
+    return sk_sp<GrTextureProxy>(new GrTextureProxy(desc, fit, budgeted, srcData, rowBytes));
+}
+
+sk_sp<GrTextureProxy> GrTextureProxy::Make(sk_sp<GrTexture> tex) {
+    return sk_sp<GrTextureProxy>(new GrTextureProxy(std::move(tex)));
+}