73 lines
2.7 KiB
C++
73 lines
2.7 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <cstdint>
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#include <vector>
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// TODO(b/129481165): remove the #pragma below and fix conversion issues
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wconversion"
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#pragma clang diagnostic ignored "-Wextra"
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#include <gui/BufferQueue.h>
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// TODO(b/129481165): remove the #pragma below and fix conversion issues
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#pragma clang diagnostic pop // ignored "-Wconversion -Wextra"
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#include <utils/StrongPointer.h>
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namespace android {
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class GraphicBuffer;
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namespace compositionengine::impl {
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// With HIDLized hwcomposer HAL, the HAL can maintain a buffer cache for each
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// HWC display and layer. When updating a display target or a layer buffer,
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// we have the option to send the buffer handle over or to request the HAL to
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// retrieve it from its cache. The latter is cheaper since it eliminates the
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// overhead to transfer the handle over the trasport layer, and the overhead
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// for the HAL to clone and retain the handle.
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//
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// To be able to find out whether a buffer is already in the HAL's cache, we
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// use HWComposerBufferCache to mirror the cache in SF.
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class HwcBufferCache {
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public:
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HwcBufferCache();
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// Given a buffer, return the HWC cache slot and
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// buffer to be sent to HWC.
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//
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// outBuffer is set to buffer when buffer is not in the HWC cache;
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// otherwise, outBuffer is set to nullptr.
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void getHwcBuffer(int slot, const sp<GraphicBuffer>& buffer, uint32_t* outSlot,
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sp<GraphicBuffer>* outBuffer);
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// Special caching slot for the layer caching feature.
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static const constexpr size_t FLATTENER_CACHING_SLOT = BufferQueue::NUM_BUFFER_SLOTS;
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private:
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// an array where the index corresponds to a slot and the value corresponds to a (counter,
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// buffer) pair. "counter" is a unique value that indicates the last time this slot was updated
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// or used and allows us to keep track of the least-recently used buffer.
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static const constexpr size_t kMaxLayerBufferCount = BufferQueue::NUM_BUFFER_SLOTS + 1;
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wp<GraphicBuffer> mBuffers[kMaxLayerBufferCount];
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};
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} // namespace compositionengine::impl
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} // namespace android
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