video_capture_overlay.h | Explore in Territory

// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_VIZ_SERVICE_FRAME_SINKS_VIDEO_CAPTURE_VIDEO_CAPTURE_OVERLAY_H_
#define COMPONENTS_VIZ_SERVICE_FRAME_SINKS_VIDEO_CAPTURE_VIDEO_CAPTURE_OVERLAY_H_

#include <stdint.h>

#include <memory>
#include <optional>
#include <string>
#include <vector>

#include "base/functional/callback.h"
#include "base/memory/raw_ref.h"
#include "base/memory/ref_counted.h"
#include "base/sequence_checker.h"
#include "components/viz/service/frame_sinks/video_capture/capturable_frame_sink.h"
#include "components/viz/service/viz_service_export.h"
#include "media/base/video_types.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "services/viz/privileged/mojom/compositing/frame_sink_video_capture.mojom.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/gfx/color_space.h"
#include "ui/gfx/color_transform.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/gfx/geometry/size.h"

namespace media {
class VideoFrame;
}

namespace viz {

// An overlay image to be blitted onto video frames. A mojo client sets the
// image, position, and size of the overlay in the video frame; and then this
// VideoCaptureOverlay scales the image and maps its color space to match that
// of the video frame before the blitting.
//
// As an optimization, the client's bitmap image is transformed (scaled, color
// space converted, and pre-multiplied by alpha), and then this cached Sprite is
// re-used for blitting to all successive video frames until some change
// requires a different transformation. MakeRenderer() produces a Renderer
// callback that holds a reference to an existing Sprite, or will create a new
// one if necessary. The Renderer callback can then be run at any point in the
// future, unaffected by later image, size, or color space settings changes.
//
// The blit algorithm uses naive linear blending. Thus, the use of non-linear
// color spaces will cause losses in color accuracy.
class VIZ_SERVICE_EXPORT VideoCaptureOverlay
    : public mojom::FrameSinkVideoCaptureOverlay { … };

}  // namespace viz

#endif  // COMPONENTS_VIZ_SERVICE_FRAME_SINKS_VIDEO_CAPTURE_VIDEO_CAPTURE_OVERLAY_H_
chromium/components/viz/service/frame_sinks/video_capture/video_capture_overlay.h
