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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef FLUTTER_FLOW_SURFACE_FRAME_H_
#define FLUTTER_FLOW_SURFACE_FRAME_H_
#include <memory>
#include <optional>
#include "flutter/common/graphics/gl_context_switch.h"
#include "flutter/display_list/display_list_canvas_recorder.h"
#include "flutter/fml/macros.h"
#include "flutter/fml/time/time_point.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkSurface.h"
namespace flutter {
// This class represents a frame that has been fully configured for the
// underlying client rendering API. A frame may only be submitted once.
class SurfaceFrame {
public:
using SubmitCallback =
std::function<bool(SurfaceFrame& surface_frame, SkCanvas* canvas)>;
// Information about the underlying framebuffer
struct FramebufferInfo {
// Indicates whether or not the surface supports pixel readback as used in
// circumstances such as a BackdropFilter.
bool supports_readback = false;
// Indicates that target device supports partial repaint. At very minimum
// this means that the surface will provide valid existing damage.
bool supports_partial_repaint = false;
// For some targets it may be beneficial or even required to snap clip
// rect to tile grid. I.e. repainting part of a tile may cause performance
// degradation if the tile needs to be decompressed first.
int vertical_clip_alignment = 1;
int horizontal_clip_alignment = 1;
// This is the area of framebuffer that lags behind the front buffer.
//
// Correctly providing exiting_damage is necessary for supporting double and
// triple buffering. Embedder is responsible for tracking this area for each
// of the back buffers used. When doing partial redraw, this area will be
// repainted alongside of dirty area determined by diffing current and
// last successfully rasterized layer tree;
//
// If existing damage is unspecified (nullopt), entire frame will be
// rasterized (no partial redraw). To signal that there is no existing
// damage use an empty SkIRect.
std::optional<SkIRect> existing_damage = std::nullopt;
};
SurfaceFrame(sk_sp<SkSurface> surface,
FramebufferInfo framebuffer_info,
const SubmitCallback& submit_callback,
std::unique_ptr<GLContextResult> context_result = nullptr,
bool display_list_fallback = false);
struct SubmitInfo {
// The frame damage for frame n is the difference between frame n and
// frame (n-1), and represents the area that a compositor must recompose.
//
// Corresponds to EGL_KHR_swap_buffers_with_damage
std::optional<SkIRect> frame_damage;
// The buffer damage for a frame is the area changed since that same buffer
// was last used. If the buffer has not been used before, the buffer damage
// is the entire area of the buffer.
//
// Corresponds to EGL_KHR_partial_update
std::optional<SkIRect> buffer_damage;
// Time at which this frame is scheduled to be presented. This is a hint
// that can be passed to the platform to drop queued frames.
std::optional<fml::TimePoint> presentation_time;
};
bool Submit();
bool IsSubmitted() const;
sk_sp<SkSurface> SkiaSurface() const;
SkCanvas* SkiaCanvas();
const FramebufferInfo& framebuffer_info() const { return framebuffer_info_; }
void set_submit_info(const SubmitInfo& submit_info) {
submit_info_ = submit_info;
}
const SubmitInfo& submit_info() const { return submit_info_; }
sk_sp<DisplayListBuilder> GetDisplayListBuilder();
sk_sp<DisplayList> BuildDisplayList();
private:
bool submitted_ = false;
sk_sp<DisplayListCanvasRecorder> dl_recorder_;
sk_sp<SkSurface> surface_;
SkCanvas* canvas_ = nullptr;
FramebufferInfo framebuffer_info_;
SubmitInfo submit_info_;
SubmitCallback submit_callback_;
std::unique_ptr<GLContextResult> context_result_;
bool PerformSubmit();
FML_DISALLOW_COPY_AND_ASSIGN(SurfaceFrame);
};
} // namespace flutter
#endif // FLUTTER_FLOW_SURFACE_FRAME_H_