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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "content/common/gpu/surface_handle_types_mac.h" |
| 6 |
| 7 #include "base/logging.h" |
| 8 |
| 9 namespace content { |
| 10 namespace { |
| 11 |
| 12 // The type of the handle is stored in the upper 64 bits. |
| 13 const uint64 kTypeMask = 0xFFFFFFFFull << 32; |
| 14 |
| 15 const uint64 kTypeIOSurface = 0x01010101ull << 32; |
| 16 const uint64 kTypeCAContext = 0x02020202ull << 32; |
| 17 |
| 18 // To make it a bit less likely that we'll just cast off the top bits of the |
| 19 // handle to get the ID, XOR lower bits with a type-specific mask. |
| 20 const uint32 kXORMaskIOSurface = 0x01010101; |
| 21 const uint32 kXORMaskCAContext = 0x02020202; |
| 22 |
| 23 } // namespace |
| 24 |
| 25 SurfaceHandleType GetSurfaceHandleType(uint64 surface_handle) { |
| 26 switch(surface_handle & kTypeMask) { |
| 27 case kTypeIOSurface: |
| 28 return kSurfaceHandleTypeIOSurface; |
| 29 case kTypeCAContext: |
| 30 return kSurfaceHandleTypeCAContext; |
| 31 } |
| 32 return kSurfaceHandleTypeInvalid; |
| 33 } |
| 34 |
| 35 IOSurfaceID IOSurfaceIDFromSurfaceHandle(uint64 surface_handle) { |
| 36 DCHECK_EQ(kSurfaceHandleTypeIOSurface, GetSurfaceHandleType(surface_handle)); |
| 37 return static_cast<uint32>(surface_handle) ^ kXORMaskIOSurface; |
| 38 } |
| 39 |
| 40 CAContextID CAContextIDFromSurfaceHandle(uint64 surface_handle) { |
| 41 DCHECK_EQ(kSurfaceHandleTypeCAContext, GetSurfaceHandleType(surface_handle)); |
| 42 return static_cast<uint32>(surface_handle) ^ kXORMaskCAContext; |
| 43 } |
| 44 |
| 45 uint64 SurfaceHandleFromIOSurfaceID(IOSurfaceID io_surface_id) { |
| 46 return kTypeIOSurface | (io_surface_id ^ kXORMaskIOSurface); |
| 47 } |
| 48 |
| 49 uint64 SurfaceHandleFromCAContextID(CAContextID ca_context_id) { |
| 50 return kTypeCAContext | (ca_context_id ^ kXORMaskCAContext); |
| 51 } |
| 52 |
| 53 } // namespace content |
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