2 * Copyright (C) 2020 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
21 #include "BackendManager.h"
22 #include "bufferinfo/BufferInfoGetter.h"
26 HWC2::Error Backend::ValidateDisplay(DrmHwcTwo::HwcDisplay *display,
28 uint32_t *num_requests) {
32 auto layers = display->GetOrderLayersByZPos();
34 int client_start = -1;
35 size_t client_size = 0;
37 if (display->compositor().ShouldFlattenOnClient()) {
39 client_size = layers.size();
40 MarkValidated(layers, client_start, client_size);
42 std::tie(client_start, client_size) = GetClientLayers(display, layers);
44 MarkValidated(layers, client_start, client_size);
46 bool testing_needed = !(client_start == 0 && client_size == layers.size());
49 display->CreateComposition(true) != HWC2::Error::None) {
50 ++display->total_stats().failed_kms_validate_;
52 client_size = layers.size();
53 MarkValidated(layers, 0, client_size);
57 *num_types = client_size;
59 display->total_stats().frames_flattened_ = display->compositor()
60 .GetFlattenedFramesCount();
61 display->total_stats().gpu_pixops_ += CalcPixOps(layers, client_start,
63 display->total_stats().total_pixops_ += CalcPixOps(layers, 0, layers.size());
65 return *num_types ? HWC2::Error::HasChanges : HWC2::Error::None;
68 std::tuple<int, size_t> Backend::GetClientLayers(
69 DrmHwcTwo::HwcDisplay *display,
70 const std::vector<DrmHwcTwo::HwcLayer *> &layers) {
71 int client_start = -1;
72 size_t client_size = 0;
74 for (int z_order = 0; z_order < layers.size(); ++z_order) {
75 if (IsClientLayer(display, layers[z_order])) {
77 client_start = (int)z_order;
78 client_size = (z_order - client_start) + 1;
82 return GetExtraClientRange(display, layers, client_start, client_size);
85 bool Backend::IsClientLayer(DrmHwcTwo::HwcDisplay *display,
86 DrmHwcTwo::HwcLayer *layer) {
87 return !HardwareSupportsLayerType(layer->sf_type()) ||
88 !BufferInfoGetter::GetInstance()->IsHandleUsable(layer->buffer()) ||
89 display->color_transform_hint() != HAL_COLOR_TRANSFORM_IDENTITY ||
90 (layer->RequireScalingOrPhasing() &&
91 display->resource_manager()->ForcedScalingWithGpu());
94 bool Backend::HardwareSupportsLayerType(HWC2::Composition comp_type) {
95 return comp_type == HWC2::Composition::Device ||
96 comp_type == HWC2::Composition::Cursor;
99 uint32_t Backend::CalcPixOps(const std::vector<DrmHwcTwo::HwcLayer *> &layers,
100 size_t first_z, size_t size) {
102 for (int z_order = 0; z_order < layers.size(); ++z_order) {
103 if (z_order >= first_z && z_order < first_z + size) {
104 hwc_rect_t df = layers[z_order]->display_frame();
105 pixops += (df.right - df.left) * (df.bottom - df.top);
111 void Backend::MarkValidated(std::vector<DrmHwcTwo::HwcLayer *> &layers,
112 size_t client_first_z, size_t client_size) {
113 for (int z_order = 0; z_order < layers.size(); ++z_order) {
114 if (z_order >= client_first_z && z_order < client_first_z + client_size)
115 layers[z_order]->set_validated_type(HWC2::Composition::Client);
117 layers[z_order]->set_validated_type(HWC2::Composition::Device);
121 std::tuple<int, int> Backend::GetExtraClientRange(
122 DrmHwcTwo::HwcDisplay *display,
123 const std::vector<DrmHwcTwo::HwcLayer *> &layers, int client_start,
124 size_t client_size) {
125 size_t avail_planes = display->primary_planes().size() +
126 display->overlay_planes().size();
129 * If more layers then planes, save one plane
130 * for client composited layers
132 if (avail_planes < display->layers().size())
135 size_t extra_client = (layers.size() - client_size) - avail_planes;
137 if (extra_client > 0) {
140 if (client_size != 0) {
141 size_t prepend = std::min((size_t)client_start, extra_client);
142 size_t append = std::min(layers.size() - (client_start + client_size),
144 start = client_start - (int)prepend;
145 client_size += extra_client;
146 steps = 1 + std::min(std::min(append, prepend),
147 int(layers.size()) - (start + client_size));
149 client_size = extra_client;
150 steps = 1 + layers.size() - extra_client;
153 uint32_t gpu_pixops = INT_MAX;
154 for (int i = 0; i < steps; i++) {
155 uint32_t po = CalcPixOps(layers, start + i, client_size);
156 if (po < gpu_pixops) {
158 client_start = start + i;
163 return std::make_tuple(client_start, client_size);
167 // NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables, cert-err58-cpp)
168 REGISTER_BACKEND("generic", Backend);
171 } // namespace android