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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_DRM_DISPLAY_COMPOSITOR_H_
#define ANDROID_DRM_DISPLAY_COMPOSITOR_H_
#include "drmhwcomposer.h"
#include "drmdisplaycomposition.h"
#include "drmframebuffer.h"
#include "separate_rects.h"
#include <pthread.h>
#include <memory>
#include <sstream>
#include <tuple>
#include <hardware/hardware.h>
#include <hardware/hwcomposer.h>
// One for the front, one for the back, and one for cases where we need to
// squash a frame that the hw can't display with hw overlays.
#define DRM_DISPLAY_BUFFERS 3
namespace android {
class GLWorkerCompositor;
class SquashState {
public:
static const unsigned kHistoryLength = 6; // TODO: make this number not magic
static const unsigned kMaxLayers = 64;
struct Region {
DrmHwcRect<int> rect;
std::bitset<kMaxLayers> layer_refs;
std::bitset<kHistoryLength> change_history;
bool squashed = false;
};
bool is_stable(int region_index) const {
return valid_history_ >= kHistoryLength &&
regions_[region_index].change_history.none();
}
const std::vector<Region> ®ions() const {
return regions_;
}
void Init(DrmHwcLayer *layers, size_t num_layers);
void GenerateHistory(DrmHwcLayer *layers, size_t num_layers,
std::vector<bool> &changed_regions) const;
void StableRegionsWithMarginalHistory(
const std::vector<bool> &changed_regions,
std::vector<bool> &stable_regions) const;
void RecordHistory(DrmHwcLayer *layers, size_t num_layers,
const std::vector<bool> &changed_regions);
bool RecordAndCompareSquashed(const std::vector<bool> &squashed_regions);
void Dump(std::ostringstream *out) const;
private:
size_t generation_number_ = 0;
unsigned valid_history_ = 0;
std::vector<buffer_handle_t> last_handles_;
std::vector<Region> regions_;
};
class DrmDisplayCompositor {
public:
DrmDisplayCompositor();
~DrmDisplayCompositor();
int Init(DrmResources *drm, int display);
std::unique_ptr<DrmDisplayComposition> CreateComposition() const;
int ApplyComposition(std::unique_ptr<DrmDisplayComposition> composition);
int Composite();
int SquashAll();
void Dump(std::ostringstream *out) const;
std::tuple<uint32_t, uint32_t, int> GetActiveModeResolution();
SquashState *squash_state() {
return &squash_state_;
}
private:
struct ModeState {
bool needs_modeset = false;
DrmMode mode;
uint32_t blob_id = 0;
uint32_t old_blob_id = 0;
};
DrmDisplayCompositor(const DrmDisplayCompositor &) = delete;
// We'll wait for acquire fences to fire for kAcquireWaitTimeoutMs,
// kAcquireWaitTries times, logging a warning in between.
static const int kAcquireWaitTries = 5;
static const int kAcquireWaitTimeoutMs = 100;
int PrepareFramebuffer(DrmFramebuffer &fb,
DrmDisplayComposition *display_comp);
int ApplySquash(DrmDisplayComposition *display_comp);
int ApplyPreComposite(DrmDisplayComposition *display_comp);
int PrepareFrame(DrmDisplayComposition *display_comp);
int CommitFrame(DrmDisplayComposition *display_comp, bool test_only);
int SquashFrame(DrmDisplayComposition *src, DrmDisplayComposition *dst);
int ApplyDpms(DrmDisplayComposition *display_comp);
int DisablePlanes(DrmDisplayComposition *display_comp);
void ClearDisplay();
void ApplyFrame(std::unique_ptr<DrmDisplayComposition> composition,
int status);
std::tuple<int, uint32_t> CreateModeBlob(const DrmMode &mode);
DrmResources *drm_;
int display_;
std::unique_ptr<DrmDisplayComposition> active_composition_;
bool initialized_;
bool active_;
bool use_hw_overlays_;
ModeState mode_;
int framebuffer_index_;
DrmFramebuffer framebuffers_[DRM_DISPLAY_BUFFERS];
std::unique_ptr<GLWorkerCompositor> pre_compositor_;
SquashState squash_state_;
int squash_framebuffer_index_;
DrmFramebuffer squash_framebuffers_[2];
// mutable since we need to acquire in Dump()
mutable pthread_mutex_t lock_;
// State tracking progress since our last Dump(). These are mutable since
// we need to reset them on every Dump() call.
mutable uint64_t dump_frames_composited_;
mutable uint64_t dump_last_timestamp_ns_;
};
}
#endif // ANDROID_DRM_DISPLAY_COMPOSITOR_H_
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