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