[Remoting] OpenGL Rendering Layer

remoting/client/gl_desktop.cc

+// Copyright 2016 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 "remoting/client/gl_desktop.h"
+
+#include "base/logging.h"
+#include "remoting/client/gl_canvas.h"
+#include "remoting/client/gl_render_layer.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
+
+namespace {
+
+const int kTextureId = 0;
+
+}  // namespace
+
+namespace remoting {
+
+GlDesktop::GlDesktop() {}
+
+GlDesktop::~GlDesktop() {}
+
+void GlDesktop::SetCanvas(GlCanvas* canvas) {
+  if (!canvas) {
+    layer_.reset();
+    return;
+  }
+  layer_.reset(new GlRenderLayer(kTextureId, canvas));
+  if (last_frame_) {
+    layer_->SetTexture(last_frame_->data(), last_frame_->size().width(),
+                       last_frame_->size().height());
+  }
+}
+
+void GlDesktop::SetVideoFrame(std::unique_ptr<webrtc::DesktopFrame> frame) {
+  if (layer_) {
+    if (!last_frame_ || !frame->size().equals(last_frame_->size())) {
+      layer_->SetTexture(frame->data(), frame->size().width(),
+                         frame->size().height());
+    } else {
+      for (webrtc::DesktopRegion::Iterator i(frame->updated_region());
+          !i.IsAtEnd(); i.Advance()) {
+        const uint8_t* rect_start =
+            frame->GetFrameDataAtPos(i.rect().top_left());
+        layer_->UpdateTexture(
+            rect_start, i.rect().left(), i.rect().top(), i.rect().width(),
+            i.rect().height(), frame->stride());
+      }
+    }
+  }
+  last_frame_ = std::move(frame);
+}
+
+void GlDesktop::Draw() {
+  if (layer_ && last_frame_) {
+    layer_->Draw();
+  }
+}
+
+}  // namespace remoting