Refactor BufferData class into a separate file to be later used by individual gbm_bo's in EGLImage.

ui/ozone/platform/dri/buffer_data.cc

+// 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 "ui/ozone/platform/dri/buffer_data.h"
+
+#include <gbm.h>
+
+#include "base/logging.h"
+#include "ui/ozone/platform/dri/dri_wrapper.h"
+
+namespace ui {
+
+// Pixel configuration for the current buffer format.
+// TODO(dnicoara) These will need to change once we'll query the hardware for

[rjkroege, 2014/06/11 14:43:04]

grammar nit: "once we query"

[alexst (slow to review), 2014/06/11 15:00:06]

Done.

+// supported configurations.
+const uint8_t kColorDepth = 24;
+const uint8_t kPixelDepth = 32;
+
+BufferData::BufferData(DriWrapper* dri, gbm_bo* buffer)
+    : dri_(dri),
+      handle_(gbm_bo_get_handle(buffer).u32),
+      framebuffer_(0) {
+  // Register the buffer with the controller. This will allow us to scan out the
+  // buffer once we're done drawing into it. If we can't register the buffer
+  // then there's no point in having BufferData associated with it.
+  if (!dri_->AddFramebuffer(gbm_bo_get_width(buffer),
+                            gbm_bo_get_height(buffer),
+                            kColorDepth,
+                            kPixelDepth,
+                            gbm_bo_get_stride(buffer),
+                            handle_,
+                            &framebuffer_)) {
+    LOG(ERROR) << "Failed to register buffer";
+  }
+}
+
+BufferData::~BufferData() {
+  if (framebuffer_)
+    dri_->RemoveFramebuffer(framebuffer_);
+}
+
+// static
+BufferData* BufferData::CreateData(DriWrapper* dri,
+                                   gbm_bo* buffer) {
+  BufferData* data = new BufferData(dri, buffer);
+  if (!data->framebuffer()) {
+    delete data;
+    return NULL;
+  }
+
+  // GBM can destroy the buffers at any time as long as they aren't locked. This
+  // sets a callback such that we can clean up all our state when GBM destroys
+  // the buffer.
+  gbm_bo_set_user_data(buffer, data, BufferData::Destroy);
+
+  return data;
+}
+
+// static
+void BufferData::Destroy(gbm_bo* buffer, void* data) {

[rjkroege, 2014/06/11 14:43:04]

this is necessary because gbm is a C-style API and calls back into this class?
bd here is "this"?

[alexst (slow to review), 2014/06/11 15:00:06]

yes

+  BufferData* bd = static_cast<BufferData*>(data);
+  delete bd;
+}
+
+// static
+BufferData* BufferData::GetData(gbm_bo* buffer) {
+  return static_cast<BufferData*>(gbm_bo_get_user_data(buffer));
+}
+
+}  // namespace ui