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/*
* Copyright (C) 2020 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.
*/
#include "Backend.h"
#include <climits>
#include "BackendManager.h"
#include "bufferinfo/BufferInfoGetter.h"
namespace android {
HWC2::Error Backend::ValidateDisplay(HwcDisplay *display, uint32_t *num_types,
uint32_t *num_requests) {
*num_types = 0;
*num_requests = 0;
auto layers = display->GetOrderLayersByZPos();
int client_start = -1;
size_t client_size = 0;
if (display->ProcessClientFlatteningState(layers.size() <= 1)) {
display->total_stats().frames_flattened_++;
client_start = 0;
client_size = layers.size();
MarkValidated(layers, client_start, client_size);
} else {
std::tie(client_start, client_size) = GetClientLayers(display, layers);
MarkValidated(layers, client_start, client_size);
bool testing_needed = !(client_start == 0 && client_size == layers.size());
AtomicCommitArgs a_args = {.test_only = true};
if (testing_needed &&
display->CreateComposition(a_args) != HWC2::Error::None) {
++display->total_stats().failed_kms_validate_;
client_start = 0;
client_size = layers.size();
MarkValidated(layers, 0, client_size);
}
}
*num_types = client_size;
display->total_stats().gpu_pixops_ += CalcPixOps(layers, client_start,
client_size);
display->total_stats().total_pixops_ += CalcPixOps(layers, 0, layers.size());
return *num_types != 0 ? HWC2::Error::HasChanges : HWC2::Error::None;
}
std::tuple<int, size_t> Backend::GetClientLayers(
HwcDisplay *display, const std::vector<HwcLayer *> &layers) {
int client_start = -1;
size_t client_size = 0;
for (size_t z_order = 0; z_order < layers.size(); ++z_order) {
if (IsClientLayer(display, layers[z_order])) {
if (client_start < 0)
client_start = (int)z_order;
client_size = (z_order - client_start) + 1;
}
}
return GetExtraClientRange(display, layers, client_start, client_size);
}
bool Backend::IsClientLayer(HwcDisplay *display, HwcLayer *layer) {
return !HardwareSupportsLayerType(layer->GetSfType()) ||
!layer->IsLayerUsableAsDevice() ||
display->color_transform_hint() != HAL_COLOR_TRANSFORM_IDENTITY ||
(layer->GetLayerData().pi.RequireScalingOrPhasing() &&
display->GetHwc2()->GetResMan().ForcedScalingWithGpu());
}
bool Backend::HardwareSupportsLayerType(HWC2::Composition comp_type) {
return comp_type == HWC2::Composition::Device ||
comp_type == HWC2::Composition::Cursor;
}
uint32_t Backend::CalcPixOps(const std::vector<HwcLayer *> &layers,
size_t first_z, size_t size) {
uint32_t pixops = 0;
for (size_t z_order = 0; z_order < layers.size(); ++z_order) {
if (z_order >= first_z && z_order < first_z + size) {
hwc_rect_t &df = layers[z_order]->GetLayerData().pi.display_frame;
pixops += (df.right - df.left) * (df.bottom - df.top);
}
}
return pixops;
}
void Backend::MarkValidated(std::vector<HwcLayer *> &layers,
size_t client_first_z, size_t client_size) {
for (size_t z_order = 0; z_order < layers.size(); ++z_order) {
if (z_order >= client_first_z && z_order < client_first_z + client_size)
layers[z_order]->SetValidatedType(HWC2::Composition::Client);
else
layers[z_order]->SetValidatedType(HWC2::Composition::Device);
}
}
std::tuple<int, int> Backend::GetExtraClientRange(
HwcDisplay *display, const std::vector<HwcLayer *> &layers,
int client_start, size_t client_size) {
auto planes = display->GetPipe().GetUsablePlanes();
size_t avail_planes = planes.size();
/*
* If more layers then planes, save one plane
* for client composited layers
*/
if (avail_planes < display->layers().size())
avail_planes--;
int extra_client = int(layers.size() - client_size) - int(avail_planes);
if (extra_client > 0) {
int start = 0;
size_t steps = 0;
if (client_size != 0) {
int prepend = std::min(client_start, extra_client);
int append = std::min(int(layers.size()) -
int(client_start + client_size),
extra_client);
start = client_start - (int)prepend;
client_size += extra_client;
steps = 1 + std::min(std::min(append, prepend),
int(layers.size()) - int(start + client_size));
} else {
client_size = extra_client;
steps = 1 + layers.size() - extra_client;
}
uint32_t gpu_pixops = UINT32_MAX;
for (size_t i = 0; i < steps; i++) {
uint32_t po = CalcPixOps(layers, start + i, client_size);
if (po < gpu_pixops) {
gpu_pixops = po;
client_start = start + int(i);
}
}
}
return std::make_tuple(client_start, client_size);
}
// clang-format off
// NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables, cert-err58-cpp)
REGISTER_BACKEND("generic", Backend);
// clang-format on
} // namespace android
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