blob: ef7254241da381359dfb2a8cd71e67af1c0e77b5 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/common/gpu/surface_handle_types_mac.h"
#include "base/logging.h"
namespace content {
namespace {
// The type of the handle is stored in the upper 64 bits.
const uint64 kTypeMask = 0xFFFFFFFFull << 32;
const uint64 kTypeIOSurface = 0x01010101ull << 32;
const uint64 kTypeCAContext = 0x02020202ull << 32;
// To make it a bit less likely that we'll just cast off the top bits of the
// handle to get the ID, XOR lower bits with a type-specific mask.
const uint32 kXORMaskIOSurface = 0x01010101;
const uint32 kXORMaskCAContext = 0x02020202;
} // namespace
SurfaceHandleType GetSurfaceHandleType(uint64 surface_handle) {
switch(surface_handle & kTypeMask) {
case kTypeIOSurface:
return kSurfaceHandleTypeIOSurface;
case kTypeCAContext:
return kSurfaceHandleTypeCAContext;
}
return kSurfaceHandleTypeInvalid;
}
IOSurfaceID IOSurfaceIDFromSurfaceHandle(uint64 surface_handle) {
DCHECK_EQ(kSurfaceHandleTypeIOSurface, GetSurfaceHandleType(surface_handle));
return static_cast<uint32>(surface_handle) ^ kXORMaskIOSurface;
}
CAContextID CAContextIDFromSurfaceHandle(uint64 surface_handle) {
DCHECK_EQ(kSurfaceHandleTypeCAContext, GetSurfaceHandleType(surface_handle));
return static_cast<uint32>(surface_handle) ^ kXORMaskCAContext;
}
uint64 SurfaceHandleFromIOSurfaceID(IOSurfaceID io_surface_id) {
return kTypeIOSurface | (io_surface_id ^ kXORMaskIOSurface);
}
uint64 SurfaceHandleFromCAContextID(CAContextID ca_context_id) {
return kTypeCAContext | (ca_context_id ^ kXORMaskCAContext);
}
} // namespace content
|
