1 /*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
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
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
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.
15 */
16
17 #include <compositionengine/impl/HwcBufferCache.h>
18
19 // TODO(b/129481165): remove the #pragma below and fix conversion issues
20 #pragma clang diagnostic push
21 #pragma clang diagnostic ignored "-Wconversion"
22
23 #include <gui/BufferQueue.h>
24 #include <ui/GraphicBuffer.h>
25
26 // TODO(b/129481165): remove the #pragma below and fix conversion issues
27 #pragma clang diagnostic pop // ignored "-Wconversion"
28
29 namespace android::compositionengine::impl {
30
HwcBufferCache()31 HwcBufferCache::HwcBufferCache() {
32 std::fill(std::begin(mBuffers), std::end(mBuffers), wp<GraphicBuffer>(nullptr));
33 }
34
getHwcBuffer(int slot,const sp<GraphicBuffer> & buffer,uint32_t * outSlot,sp<GraphicBuffer> * outBuffer)35 void HwcBufferCache::getHwcBuffer(int slot, const sp<GraphicBuffer>& buffer, uint32_t* outSlot,
36 sp<GraphicBuffer>* outBuffer) {
37 // default is 0
38 if (slot == BufferQueue::INVALID_BUFFER_SLOT || slot < 0 ||
39 slot >= static_cast<int32_t>(kMaxLayerBufferCount)) {
40 *outSlot = 0;
41 } else {
42 *outSlot = static_cast<uint32_t>(slot);
43 }
44
45 auto& currentBuffer = mBuffers[*outSlot];
46 wp<GraphicBuffer> weakCopy(buffer);
47 if (currentBuffer == weakCopy) {
48 // already cached in HWC, skip sending the buffer
49 *outBuffer = nullptr;
50 } else {
51 *outBuffer = buffer;
52
53 // update cache
54 currentBuffer = buffer;
55 }
56 }
57
58 } // namespace android::compositionengine::impl
59