Simplify the transport dib situation across our various platforms, as a

pre-cursor to moving Chrome OS + Aura away from legacy GTK+X11 dibs. Now, we
have just:
- Windows style dibs
- POSIX style dibs
- Legacy GTK+X11 style dibs.

There's some ifdef hoops that will be removed in a follow-up CL when
Chrome OS + Aura will be moved away from legacy GTK+X11 dibs and on to POSIX
dibs.

BUG=147622
Review URL: https://codereview.chromium.org/13582008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@192629 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 118 insertions, 0 deletions

diff --git a/ui/surface/transport_dib_posix.cc b/ui/surface/transport_dib_posix.cc
new file mode 100644
index 0000000..fcb935d
--- /dev/null
+++ b/ui/surface/transport_dib_posix.cc
@@ -0,0 +1,118 @@
+// Copyright (c) 2012 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 "ui/surface/transport_dib.h"
+
+// Desktop GTK Linux builds use the old-style SYSV SHM based DIBs.
+// Linux Aura and Chrome OS do too. This will change very soon.
+#if !defined(TOOLKIT_GTK) && !(defined(OS_LINUX) && defined(USE_AURA))
+
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/shared_memory.h"
+#include "base/posix/eintr_wrapper.h"
+#include "skia/ext/platform_canvas.h"
+
+TransportDIB::TransportDIB()
+    : size_(0) {
+}
+
+TransportDIB::TransportDIB(TransportDIB::Handle dib)
+    : shared_memory_(dib, false /* read write */),
+      size_(0) {
+}
+
+TransportDIB::~TransportDIB() {
+}
+
+// static
+TransportDIB* TransportDIB::Create(size_t size, uint32 sequence_num) {
+  TransportDIB* dib = new TransportDIB;
+  if (!dib->shared_memory_.CreateAndMapAnonymous(size)) {
+    delete dib;
+    return NULL;
+  }
+
+  dib->size_ = size;
+  return dib;
+}
+
+// static
+TransportDIB* TransportDIB::Map(Handle handle) {
+  scoped_ptr<TransportDIB> dib(CreateWithHandle(handle));
+  if (!dib->Map())
+    return NULL;
+  return dib.release();
+}
+
+// static
+TransportDIB* TransportDIB::CreateWithHandle(Handle handle) {
+  return new TransportDIB(handle);
+}
+
+// static
+bool TransportDIB::is_valid_handle(Handle dib) {
+  return dib.fd >= 0;
+}
+
+// static
+bool TransportDIB::is_valid_id(Id id) {
+#if defined(OS_ANDROID)
+  return is_valid_handle(id);
+#else
+  return id != 0;
+#endif
+}
+
+skia::PlatformCanvas* TransportDIB::GetPlatformCanvas(int w, int h) {
+  if ((!memory() && !Map()) || !VerifyCanvasSize(w, h))
+    return NULL;
+  return skia::CreatePlatformCanvas(w, h, true, 
+                                    reinterpret_cast<uint8_t*>(memory()),
+                                    skia::RETURN_NULL_ON_FAILURE);
+}
+
+bool TransportDIB::Map() {
+  if (!is_valid_handle(handle()))
+    return false;
+#if defined(OS_ANDROID)
+  if (!shared_memory_.Map(0))
+    return false;
+  size_ = shared_memory_.mapped_size();
+#else
+  if (memory())
+    return true;
+
+  struct stat st;
+  if ((fstat(shared_memory_.handle().fd, &st) != 0) ||
+      (!shared_memory_.Map(st.st_size))) {
+    return false;
+  }
+
+  size_ = st.st_size;
+#endif
+  return true;
+}
+
+void* TransportDIB::memory() const {
+  return shared_memory_.memory();
+}
+
+TransportDIB::Id TransportDIB::id() const {
+#if defined(OS_ANDROID)
+  return handle();
+#else
+  return shared_memory_.id();
+#endif
+}
+
+TransportDIB::Handle TransportDIB::handle() const {
+  return shared_memory_.handle();
+}
+
+#endif  // !defined(TOOLKIT_GTK) && !(defined(OS_LINUX) && defined(USE_AURA))
+