1// Copyright 2013 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 "cc/resources/texture_mailbox.h"
6
7#include "base/logging.h"
8#include "cc/resources/shared_bitmap.h"
9#include "third_party/khronos/GLES2/gl2.h"
10
11namespace cc {
12
13TextureMailbox::TextureMailbox() : shared_memory_(NULL) {}
14
15TextureMailbox::TextureMailbox(const gpu::MailboxHolder& mailbox_holder)
16    : mailbox_holder_(mailbox_holder),
17      shared_memory_(NULL),
18      allow_overlay_(false) {}
19
20TextureMailbox::TextureMailbox(const gpu::Mailbox& mailbox,
21                               uint32 target,
22                               uint32 sync_point)
23    : mailbox_holder_(mailbox, target, sync_point),
24      shared_memory_(NULL),
25      allow_overlay_(false) {}
26
27TextureMailbox::TextureMailbox(base::SharedMemory* shared_memory,
28                               const gfx::Size& size)
29    : shared_memory_(shared_memory),
30      shared_memory_size_(size),
31      allow_overlay_(false) {
32  // If an embedder of cc gives an invalid TextureMailbox, we should crash
33  // here to identify the offender.
34  CHECK(SharedBitmap::VerifySizeInBytes(shared_memory_size_));
35}
36
37TextureMailbox::~TextureMailbox() {}
38
39bool TextureMailbox::Equals(const TextureMailbox& other) const {
40  if (other.IsTexture()) {
41    return IsTexture() && !memcmp(mailbox_holder_.mailbox.name,
42                                  other.mailbox_holder_.mailbox.name,
43                                  sizeof(mailbox_holder_.mailbox.name));
44  } else if (other.IsSharedMemory()) {
45    return IsSharedMemory() &&
46           shared_memory_->handle() == other.shared_memory_->handle();
47  }
48
49  DCHECK(!other.IsValid());
50  return !IsValid();
51}
52
53size_t TextureMailbox::SharedMemorySizeInBytes() const {
54  // UncheckedSizeInBytes is okay because we VerifySizeInBytes in the
55  // constructor and the field is immutable.
56  return SharedBitmap::UncheckedSizeInBytes(shared_memory_size_);
57}
58
59}  // namespace cc
60