implemented copy surface as draw for metal gpu backend

Bug: skia:
Change-Id: Ie61bd6ad9f288b8a025d44f887a0954101a7d710
Reviewed-on: https://skia-review.googlesource.com/142687
Commit-Queue: Timothy Liang <timliang@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/src/gpu/mtl/GrMtlResourceProvider.h b/src/gpu/mtl/GrMtlResourceProvider.h
new file mode 100644
index 0000000000..d5b66ede66
--- /dev/null
+++ b/src/gpu/mtl/GrMtlResourceProvider.h
@@ -0,0 +1,33 @@
+/*
+ * 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 GrMtlResourceProvider_DEFINED
+#define GrMtlResourceProvider_DEFINED
+
+#include "GrMtlCopyPipelineState.h"
+#include "SkTArray.h"
+
+#import <metal/metal.h>
+
+class GrMtlGpu;
+
+class GrMtlResourceProvider {
+public:
+    GrMtlResourceProvider(GrMtlGpu* gpu) : fGpu(gpu) {}
+
+    GrMtlCopyPipelineState* findOrCreateCopyPipelineState(MTLPixelFormat dstPixelFormat,
+                                                          id<MTLFunction> vertexFunction,
+                                                          id<MTLFunction> fragmentFunction,
+                                                          MTLVertexDescriptor* vertexDescriptor);
+
+private:
+    SkTArray<std::unique_ptr<GrMtlCopyPipelineState>> fCopyPipelineStateCache;
+
+    GrMtlGpu* fGpu;
+};
+
+#endif