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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_PLATFORM_H_
#define ANDROID_DRM_PLATFORM_H_
#include "drmdisplaycomposition.h"
#include "drmhwcomposer.h"
#include <hardware/hardware.h>
#include <hardware/hwcomposer.h>
#include <map>
#include <vector>
namespace android {
class DrmResources;
class Importer {
public:
virtual ~Importer() {
}
// Creates a platform-specific importer instance
static Importer *CreateInstance(DrmResources *drm);
// Imports the buffer referred to by handle into bo.
//
// Note: This can be called from a different thread than ReleaseBuffer. The
// implementation is responsible for ensuring thread safety.
virtual int ImportBuffer(buffer_handle_t handle, hwc_drm_bo_t *bo) = 0;
// Releases the buffer object (ie: does the inverse of ImportBuffer)
//
// Note: This can be called from a different thread than ImportBuffer. The
// implementation is responsible for ensuring thread safety.
virtual int ReleaseBuffer(hwc_drm_bo_t *bo) = 0;
};
class Planner {
public:
class PlanStage {
public:
virtual ~PlanStage() {
}
virtual int ProvisionPlanes(std::vector<DrmCompositionPlane> *composition,
std::map<size_t, DrmHwcLayer *> &layers,
DrmCrtc *crtc,
std::vector<DrmPlane *> *planes) = 0;
protected:
// Removes and returns the next available plane from planes
static DrmPlane *PopPlane(std::vector<DrmPlane *> *planes) {
if (planes->empty())
return NULL;
DrmPlane *plane = planes->front();
planes->erase(planes->begin());
return plane;
}
// Finds and returns the squash layer from the composition
static DrmCompositionPlane *GetPrecomp(
std::vector<DrmCompositionPlane> *composition) {
auto l = GetPrecompIter(composition);
if (l == composition->end())
return NULL;
return &(*l);
}
// Inserts the given layer:plane in the composition right before the precomp
// layer
static int Emplace(std::vector<DrmCompositionPlane> *composition,
std::vector<DrmPlane *> *planes,
DrmCompositionPlane::Type type, DrmCrtc *crtc,
size_t source_layer) {
DrmPlane *plane = PopPlane(planes);
if (!plane)
return -ENOENT;
auto precomp = GetPrecompIter(composition);
composition->emplace(precomp, type, plane, crtc, source_layer);
return 0;
}
private:
static std::vector<DrmCompositionPlane>::iterator GetPrecompIter(
std::vector<DrmCompositionPlane> *composition) {
return std::find_if(composition->begin(), composition->end(),
[](const DrmCompositionPlane &p) {
return p.type() == DrmCompositionPlane::Type::kPrecomp;
});
}
};
// Creates a planner instance with platform-specific planning stages
static std::unique_ptr<Planner> CreateInstance(DrmResources *drm);
// Takes a stack of layers and provisions hardware planes for them. If the
// entire stack can't fit in hardware, the Planner may place the remaining
// layers in a PRECOMP plane. Layers in the PRECOMP plane will be composited
// using GL. PRECOMP planes should be placed above any 1:1 layer:plane
// compositions. If use_squash_fb is true, the Planner should try to reserve a
// plane at the highest z-order with type SQUASH.
//
// @layers: a map of index:layer of layers to composite
// @use_squash_fb: reserve a squash framebuffer
// @primary_planes: a vector of primary planes available for this frame
// @overlay_planes: a vector of overlay planes available for this frame
//
// Returns: A tuple with the status of the operation (0 for success) and
// a vector of the resulting plan (ie: layer->plane mapping).
std::tuple<int, std::vector<DrmCompositionPlane>> ProvisionPlanes(
std::map<size_t, DrmHwcLayer *> &layers, bool use_squash_fb,
DrmCrtc *crtc, std::vector<DrmPlane *> *primary_planes,
std::vector<DrmPlane *> *overlay_planes);
template <typename T, typename... A>
void AddStage(A &&... args) {
stages_.emplace_back(
std::unique_ptr<PlanStage>(new T(std::forward(args)...)));
}
private:
std::vector<DrmPlane *> GetUsablePlanes(
DrmCrtc *crtc, std::vector<DrmPlane *> *primary_planes,
std::vector<DrmPlane *> *overlay_planes);
std::vector<std::unique_ptr<PlanStage>> stages_;
};
// This plan stage extracts all protected layers and places them on dedicated
// planes.
class PlanStageProtected : public Planner::PlanStage {
public:
int ProvisionPlanes(std::vector<DrmCompositionPlane> *composition,
std::map<size_t, DrmHwcLayer *> &layers, DrmCrtc *crtc,
std::vector<DrmPlane *> *planes);
};
// This plan stage provisions the precomp plane with any remaining layers that
// are on top of the current precomp layers. This stage should be included in
// all platforms before loosely allocating layers (i.e. PlanStageGreedy) if
// any previous plan could have modified the precomp plane layers
// (ex. PlanStageProtected).
class PlanStagePrecomp : public Planner::PlanStage {
public:
int ProvisionPlanes(std::vector<DrmCompositionPlane> *composition,
std::map<size_t, DrmHwcLayer *> &layers, DrmCrtc *crtc,
std::vector<DrmPlane *> *planes);
};
// This plan stage places as many layers on dedicated planes as possible (first
// come first serve), and then sticks the rest in a precomposition plane (if
// needed).
class PlanStageGreedy : public Planner::PlanStage {
public:
int ProvisionPlanes(std::vector<DrmCompositionPlane> *composition,
std::map<size_t, DrmHwcLayer *> &layers, DrmCrtc *crtc,
std::vector<DrmPlane *> *planes);
};
}
#endif
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