diff options
Diffstat (limited to 'backend/Backend.cpp')
-rw-r--r-- | backend/Backend.cpp | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/backend/Backend.cpp b/backend/Backend.cpp new file mode 100644 index 0000000..50ef900 --- /dev/null +++ b/backend/Backend.cpp @@ -0,0 +1,136 @@ +/* + * 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 "BackendManager.h" + +namespace android { + +HWC2::Error Backend::ValidateDisplay(DrmHwcTwo::HwcDisplay *display, + uint32_t *num_types, + uint32_t *num_requests) { + *num_types = 0; + *num_requests = 0; + size_t avail_planes = display->primary_planes().size() + + display->overlay_planes().size(); + + /* + * If more layers then planes, save one plane + * for client composited layers + */ + if (avail_planes < display->layers().size()) + avail_planes--; + + std::map<uint32_t, DrmHwcTwo::HwcLayer *> z_map, z_map_tmp; + uint32_t z_index = 0; + // First create a map of layers and z_order values + for (std::pair<const hwc2_layer_t, DrmHwcTwo::HwcLayer> &l : + display->layers()) + z_map_tmp.emplace(std::make_pair(l.second.z_order(), &l.second)); + // normalise the map so that the lowest z_order layer has key 0 + for (std::pair<const uint32_t, DrmHwcTwo::HwcLayer *> &l : z_map_tmp) + z_map.emplace(std::make_pair(z_index++, l.second)); + + uint32_t total_pixops = display->CalcPixOps(z_map, 0, z_map.size()); + uint32_t gpu_pixops = 0; + + int client_start = -1, client_size = 0; + + if (display->compositor().ShouldFlattenOnClient()) { + client_start = 0; + client_size = z_map.size(); + display->MarkValidated(z_map, client_start, client_size); + } else { + std::tie(client_start, client_size) = GetClientLayers(display, z_map); + + int extra_client = (z_map.size() - client_size) - avail_planes; + if (extra_client > 0) { + int start = 0, steps; + if (client_size != 0) { + int prepend = std::min(client_start, extra_client); + int append = std::min(int(z_map.size() - (client_start + client_size)), + extra_client); + start = client_start - prepend; + client_size += extra_client; + steps = 1 + std::min(std::min(append, prepend), + int(z_map.size()) - (start + client_size)); + } else { + client_size = extra_client; + steps = 1 + z_map.size() - extra_client; + } + + gpu_pixops = INT_MAX; + for (int i = 0; i < steps; i++) { + uint32_t po = display->CalcPixOps(z_map, start + i, client_size); + if (po < gpu_pixops) { + gpu_pixops = po; + client_start = start + i; + } + } + } + + display->MarkValidated(z_map, client_start, client_size); + + bool testing_needed = !(client_start == 0 && client_size == z_map.size()); + + if (testing_needed && + display->CreateComposition(true) != HWC2::Error::None) { + ++display->total_stats().failed_kms_validate_; + gpu_pixops = total_pixops; + client_size = z_map.size(); + display->MarkValidated(z_map, 0, client_size); + } + } + + *num_types = client_size; + + display->total_stats().frames_flattened_ = display->compositor() + .GetFlattenedFramesCount(); + display->total_stats().gpu_pixops_ += gpu_pixops; + display->total_stats().total_pixops_ += total_pixops; + + return *num_types ? HWC2::Error::HasChanges : HWC2::Error::None; +} + +std::tuple<int, int> Backend::GetClientLayers( + DrmHwcTwo::HwcDisplay *display, + const std::map<uint32_t, DrmHwcTwo::HwcLayer *> &z_map) { + int client_start = -1, client_size = 0; + + for (auto & [ z_order, layer ] : z_map) { + if (IsClientLayer(display, layer)) { + if (client_start < 0) + client_start = z_order; + client_size = (z_order - client_start) + 1; + } + } + + return std::make_tuple(client_start, client_size); +} + +bool Backend::IsClientLayer(DrmHwcTwo::HwcDisplay *display, + DrmHwcTwo::HwcLayer *layer) { + return !display->HardwareSupportsLayerType(layer->sf_type()) || + !display->importer()->CanImportBuffer(layer->buffer()) || + display->color_transform_hint() != HAL_COLOR_TRANSFORM_IDENTITY || + (layer->RequireScalingOrPhasing() && + display->resource_manager()->ForcedScalingWithGpu()); +} + +REGISTER_BACKEND("generic", Backend); + +} // namespace android |