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 54
