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, 37 insertions, 0 deletions

diff --git a/src/gpu/mtl/GrMtlCopyPipelineState.h b/src/gpu/mtl/GrMtlCopyPipelineState.h
new file mode 100644
index 0000000000..ce4cbb2bf7
--- /dev/null
+++ b/src/gpu/mtl/GrMtlCopyPipelineState.h
@@ -0,0 +1,37 @@
+/*
+ * 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 GrMtlCopyPipelineState_DEFINED
+#define GrMtlCopyPipelineState_DEFINED
+
+#import <metal/metal.h>
+
+class GrMtlGpu;
+
+class GrMtlCopyPipelineState {
+public:
+    static GrMtlCopyPipelineState* CreateCopyPipelineState(GrMtlGpu* gpu,
+                                                           MTLPixelFormat dstPixelFormat,
+                                                           id<MTLFunction> vertexFunction,
+                                                           id<MTLFunction> fragmentFunction,
+                                                           MTLVertexDescriptor* vertexDescriptor);
+
+    id<MTLRenderPipelineState> mtlCopyPipelineState() { return fPipelineState; }
+
+private:
+    GrMtlCopyPipelineState(id<MTLRenderPipelineState> pipelineState,
+                       MTLPixelFormat pixelFormat)
+            : fPipelineState(pipelineState)
+            , fPixelFormat(pixelFormat) {}
+
+    id<MTLRenderPipelineState> fPipelineState;
+    MTLPixelFormat fPixelFormat;
+
+    friend class GrMtlCopyManager;
+};
+
+#endif