system/hwc3/DrmSwapchain.cpp

/*
 * Copyright 2023 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 "DrmSwapchain.h"

#include <log/log.h>
#include <sync/sync.h>
#include <ui/GraphicBufferAllocator.h>

namespace aidl::android::hardware::graphics::composer3::impl {

DrmSwapchain::Image::Image(const native_handle_t* buffer, std::shared_ptr<DrmBuffer> drmBuffer)
    : mBuffer(buffer), mDrmBuffer(drmBuffer) {}

DrmSwapchain::Image::Image(Image&& other)
    : mBuffer(std::move(other.mBuffer)),
      mDrmBuffer(std::move(other.mDrmBuffer)),
      mLastUseFenceFd(std::move(other.mLastUseFenceFd)) {
    other.mBuffer = nullptr;
}

DrmSwapchain::Image::~Image() {
    if (mBuffer) {
        ::android::GraphicBufferAllocator::get().free(mBuffer);
    }
}

int DrmSwapchain::Image::wait() {
    if (!mLastUseFenceFd.ok()) {
        return 0;
    }
    int err = sync_wait(mLastUseFenceFd.get(), 3000);
    mLastUseFenceFd = ::android::base::unique_fd();
    if (err < 0 && errno == ETIME) {
        ALOGE("%s waited on fence %d for 3000 ms", __FUNCTION__, mLastUseFenceFd.get());
    }
    if (err < 0) {
        return err;
    }
    return 0;
}

void DrmSwapchain::Image::markAsInUse(::android::base::unique_fd useCompleteFenceFd) {
    mLastUseFenceFd = std::move(useCompleteFenceFd);
}

const native_handle_t* DrmSwapchain::Image::getBuffer() { return mBuffer; }

const std::shared_ptr<DrmBuffer> DrmSwapchain::Image::getDrmBuffer() { return mDrmBuffer; }

std::unique_ptr<DrmSwapchain> DrmSwapchain::create(uint32_t width, uint32_t height, uint32_t usage,
                                                   DrmClient* client, uint32_t numImages) {
    DEBUG_LOG("%s: creating swapchain w:%" PRIu32 " h:%" PRIu32 " usage:%" PRIu32 " count:%" PRIu32,
              __FUNCTION__, width, height, usage, numImages);
    std::vector<Image> images;
    for (uint32_t i = 0; i < numImages; i++) {
        const uint32_t layerCount = 1;
        buffer_handle_t handle;
        uint32_t stride;
        if (::android::GraphicBufferAllocator::get().allocate(
                width, height, ::android::PIXEL_FORMAT_RGBA_8888, layerCount, usage, &handle,
                &stride, "RanchuHwc") != ::android::OK) {
            ALOGE("%s: Failed to allocate drm ahb", __FUNCTION__);
            return nullptr;
        }
        auto ahb = static_cast<const native_handle_t*>(handle);

        HWC3::Error drmBufferCreateError;
        std::shared_ptr<DrmBuffer> drmBuffer;
        if (client) {
            std::tie(drmBufferCreateError, drmBuffer) = client->create(ahb);
            if (drmBufferCreateError != HWC3::Error::None) {
                ALOGE("%s: failed to create target drm ahb", __FUNCTION__);
                return nullptr;
            }
        }

        images.emplace_back(Image(ahb, std::move(drmBuffer)));
    }
    return std::unique_ptr<DrmSwapchain>(new DrmSwapchain(std::move(images)));
}

DrmSwapchain::DrmSwapchain(std::vector<Image> images) : mImages(std::move(images)) {}

DrmSwapchain::Image* DrmSwapchain::getNextImage() {
    auto index = (mLastUsedIndex + 1) % mImages.size();
    mLastUsedIndex = index;
    return &mImages[index];
}

}  // namespace aidl::android::hardware::graphics::composer3::impl