1 // Copyright (c) 2012 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 "ui/surface/transport_dib.h"
6
7 #include <sys/stat.h>
8 #include <unistd.h>
9
10 #include "base/logging.h"
11 #include "base/memory/scoped_ptr.h"
12 #include "base/memory/shared_memory.h"
13 #include "skia/ext/platform_canvas.h"
14
TransportDIB()15 TransportDIB::TransportDIB()
16 : size_(0) {
17 }
18
TransportDIB(TransportDIB::Handle dib)19 TransportDIB::TransportDIB(TransportDIB::Handle dib)
20 : shared_memory_(dib, false /* read write */),
21 size_(0) {
22 }
23
~TransportDIB()24 TransportDIB::~TransportDIB() {
25 }
26
27 // static
Create(size_t size,uint32 sequence_num)28 TransportDIB* TransportDIB::Create(size_t size, uint32 sequence_num) {
29 TransportDIB* dib = new TransportDIB;
30 if (!dib->shared_memory_.CreateAndMapAnonymous(size)) {
31 delete dib;
32 return NULL;
33 }
34
35 dib->size_ = size;
36 return dib;
37 }
38
39 // static
Map(Handle handle)40 TransportDIB* TransportDIB::Map(Handle handle) {
41 scoped_ptr<TransportDIB> dib(CreateWithHandle(handle));
42 if (!dib->Map())
43 return NULL;
44 return dib.release();
45 }
46
47 // static
CreateWithHandle(Handle handle)48 TransportDIB* TransportDIB::CreateWithHandle(Handle handle) {
49 return new TransportDIB(handle);
50 }
51
52 // static
is_valid_handle(Handle dib)53 bool TransportDIB::is_valid_handle(Handle dib) {
54 return dib.fd >= 0;
55 }
56
57 // static
is_valid_id(Id id)58 bool TransportDIB::is_valid_id(Id id) {
59 #if defined(OS_ANDROID)
60 return is_valid_handle(id);
61 #else
62 return id != 0;
63 #endif
64 }
65
GetPlatformCanvas(int w,int h)66 skia::PlatformCanvas* TransportDIB::GetPlatformCanvas(int w, int h) {
67 if ((!memory() && !Map()) || !VerifyCanvasSize(w, h))
68 return NULL;
69 return skia::CreatePlatformCanvas(w, h, true,
70 reinterpret_cast<uint8_t*>(memory()),
71 skia::RETURN_NULL_ON_FAILURE);
72 }
73
Map()74 bool TransportDIB::Map() {
75 if (!is_valid_handle(handle()))
76 return false;
77 #if defined(OS_ANDROID)
78 if (!shared_memory_.Map(0))
79 return false;
80 size_ = shared_memory_.mapped_size();
81 #else
82 if (memory())
83 return true;
84
85 struct stat st;
86 if ((fstat(shared_memory_.handle().fd, &st) != 0) ||
87 (!shared_memory_.Map(st.st_size))) {
88 return false;
89 }
90
91 size_ = st.st_size;
92 #endif
93 return true;
94 }
95
memory() const96 void* TransportDIB::memory() const {
97 return shared_memory_.memory();
98 }
99
id() const100 TransportDIB::Id TransportDIB::id() const {
101 #if defined(OS_ANDROID)
102 return handle();
103 #else
104 return shared_memory_.id();
105 #endif
106 }
107
handle() const108 TransportDIB::Handle TransportDIB::handle() const {
109 return shared_memory_.handle();
110 }
111