/*
 * Copyright (C) 2010 The Android Open Source Project
 * Copyright (C) 2012-2014, The Linux Foundation. All rights reserved.
 *
 * Not a Contribution, Apache license notifications and license are retained
 * for attribution purposes only.
 *
 * 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 <fcntl.h>
#include <errno.h>

#include <cutils/log.h>
#include <utils/Trace.h>
#include <overlayWriteback.h>
#include "hwc_utils.h"
#include "hwc_fbupdate.h"
#include "hwc_mdpcomp.h"
#include "hwc_dump_layers.h"
#include "hwc_copybit.h"
#include "hwc_virtual.h"

#define HWCVIRTUAL_LOG 0

using namespace qhwc;
using namespace overlay;

HWCVirtualBase* HWCVirtualBase::getObject(bool isVDSEnabled) {

    if(isVDSEnabled) {
        ALOGD_IF(HWCVIRTUAL_LOG, "%s: VDS is enabled for Virtual display",
                 __FUNCTION__);
        return new HWCVirtualVDS();
    } else {
        ALOGD_IF(HWCVIRTUAL_LOG, "%s: V4L2 is enabled for Virtual display",
                 __FUNCTION__);
        return new HWCVirtualV4L2();
    }
}

void HWCVirtualVDS::init(hwc_context_t *ctx) {
    const int dpy = HWC_DISPLAY_VIRTUAL;
    ctx->mFBUpdate[dpy] =
            IFBUpdate::getObject(ctx, dpy);
    ctx->mMDPComp[dpy] =  MDPComp::getObject(ctx, dpy);

    if(ctx->mFBUpdate[dpy])
        ctx->mFBUpdate[dpy]->reset();
    if(ctx->mMDPComp[dpy])
        ctx->mMDPComp[dpy]->reset();
}

void HWCVirtualVDS::destroy(hwc_context_t *ctx, size_t /*numDisplays*/,
                       hwc_display_contents_1_t** displays) {
    int dpy = HWC_DISPLAY_VIRTUAL;

    //Cleanup virtual display objs, since there is no explicit disconnect
    if(ctx->dpyAttr[dpy].connected && (displays[dpy] == NULL)) {
        ctx->dpyAttr[dpy].connected = false;
        ctx->dpyAttr[dpy].isPause = false;

        if(ctx->mFBUpdate[dpy]) {
            delete ctx->mFBUpdate[dpy];
            ctx->mFBUpdate[dpy] = NULL;
        }
        if(ctx->mMDPComp[dpy]) {
            delete ctx->mMDPComp[dpy];
            ctx->mMDPComp[dpy] = NULL;
        }
        // We reset the WB session to non-secure when the virtual display
        // has been disconnected.
        if(!Writeback::getInstance()->setSecure(false)) {
            ALOGE("Failure while attempting to reset WB session.");
        }
        ctx->mWfdSyncLock.lock();
        ctx->mWfdSyncLock.signal();
        ctx->mWfdSyncLock.unlock();
    }
}

int HWCVirtualVDS::prepare(hwc_composer_device_1 *dev,
        hwc_display_contents_1_t *list) {
    ATRACE_CALL();
    //XXX: Fix when framework support is added
    hwc_context_t* ctx = (hwc_context_t*)(dev);
    const int dpy = HWC_DISPLAY_VIRTUAL;

    if (list && list->outbuf && list->numHwLayers > 0) {
        reset_layer_prop(ctx, dpy, (int)list->numHwLayers - 1);
        uint32_t last = (uint32_t)list->numHwLayers - 1;
        hwc_layer_1_t *fbLayer = &list->hwLayers[last];
        int fbWidth = 0, fbHeight = 0;
        getLayerResolution(fbLayer, fbWidth, fbHeight);
        ctx->dpyAttr[dpy].xres = fbWidth;
        ctx->dpyAttr[dpy].yres = fbHeight;

        if(ctx->dpyAttr[dpy].connected == false) {
            ctx->dpyAttr[dpy].connected = true;
            ctx->dpyAttr[dpy].isPause = false;
            // We set the vsync period to the primary refresh rate, leaving
            // it up to the consumer to decide how fast to consume frames.
            ctx->dpyAttr[dpy].vsync_period
                              = ctx->dpyAttr[HWC_DISPLAY_PRIMARY].vsync_period;
            init(ctx);
            // XXX: for architectures with limited resources we would normally
            // allow one padding round to free up resources but this breaks
            // certain use cases.
        }
        if(!ctx->dpyAttr[dpy].isPause) {
            ctx->dpyAttr[dpy].isConfiguring = false;
            ctx->dpyAttr[dpy].fd = Writeback::getInstance()->getFbFd();
            private_handle_t *ohnd = (private_handle_t *)list->outbuf;
            Writeback::getInstance()->configureDpyInfo(ohnd->width,
                                                          ohnd->height);
            setListStats(ctx, list, dpy);

            if(ctx->mMDPComp[dpy]->prepare(ctx, list) < 0) {
                const int fbZ = 0;
                if(not ctx->mFBUpdate[dpy]->prepareAndValidate(ctx, list, fbZ))
                {
                    ctx->mOverlay->clear(dpy);
                    ctx->mLayerRotMap[dpy]->clear();
                }
            }
        } else {
            /* Virtual Display is in Pause state.
             * Mark all application layers as OVERLAY so that
             * GPU will not compose.
             */
            for(size_t i = 0 ;i < (size_t)(list->numHwLayers - 1); i++) {
                hwc_layer_1_t *layer = &list->hwLayers[i];
                layer->compositionType = HWC_OVERLAY;
            }
        }
    }
    return 0;
}

int HWCVirtualVDS::set(hwc_context_t *ctx, hwc_display_contents_1_t *list) {
    ATRACE_CALL();
    int ret = 0;
    const int dpy = HWC_DISPLAY_VIRTUAL;

    if (list && list->outbuf && list->numHwLayers > 0) {
        uint32_t last = (uint32_t)list->numHwLayers - 1;
        hwc_layer_1_t *fbLayer = &list->hwLayers[last];

        if(ctx->dpyAttr[dpy].connected
                && (!ctx->dpyAttr[dpy].isPause))
        {
            private_handle_t *ohnd = (private_handle_t *)list->outbuf;
            int format = ohnd->format;
            if (format == HAL_PIXEL_FORMAT_RGBA_8888)
                format = HAL_PIXEL_FORMAT_RGBX_8888;
            Writeback::getInstance()->setOutputFormat(
                                    utils::getMdpFormat(format));

            // Configure WB as secure if the output buffer handle is secure.
            if(isSecureBuffer(ohnd)){
                if(! Writeback::getInstance()->setSecure(true))
                {
                    ALOGE("Failed to set WB as secure for virtual display");
                    return false;
                }
            }

            int fd = -1; //FenceFD from the Copybit
            hwc_sync(ctx, list, dpy, fd);

            if (!ctx->mMDPComp[dpy]->draw(ctx, list)) {
                ALOGE("%s: MDPComp draw failed", __FUNCTION__);
                ret = -1;
            }
            // We need an FB layer handle check to cater for this usecase:
            // Video is playing in landscape on primary, then launch
            // ScreenRecord app.
            // In this scenario, the first VDS draw call will have HWC
            // composition and VDS does nit involve GPU to get eglSwapBuffer
            // to get valid fb handle.
            if (fbLayer->handle && !ctx->mFBUpdate[dpy]->draw(ctx,
                        (private_handle_t *)fbLayer->handle)) {
                ALOGE("%s: FBUpdate::draw fail!", __FUNCTION__);
                ret = -1;
            }

            Writeback::getInstance()->queueBuffer(ohnd->fd,
                                        (uint32_t)ohnd->offset);
            if(!Overlay::displayCommit(ctx->dpyAttr[dpy].fd)) {
                ALOGE("%s: display commit fail!", __FUNCTION__);
                ret = -1;
            }

        } else if(list->outbufAcquireFenceFd >= 0) {
            //If we dont handle the frame, set retireFenceFd to outbufFenceFd,
            //which will make sure, the framework waits on it and closes it.
            //The other way is to wait on outbufFenceFd ourselves, close it and
            //set retireFenceFd to -1. Since we want hwc to be async, choosing
            //the former.
            //Also dup because, the closeAcquireFds() will close the outbufFence
            list->retireFenceFd = dup(list->outbufAcquireFenceFd);
        }
    }

    closeAcquireFds(list);
    return ret;
}

void HWCVirtualVDS::pause(hwc_context_t* ctx, int dpy) {
    {
        Locker::Autolock _l(ctx->mDrawLock);
        ctx->dpyAttr[dpy].isActive = true;
        ctx->dpyAttr[dpy].isPause = true;
        ctx->proc->invalidate(ctx->proc);
    }
    usleep(ctx->dpyAttr[HWC_DISPLAY_PRIMARY].vsync_period
            * 2 / 1000);
    return;
}

void HWCVirtualVDS::resume(hwc_context_t* ctx, int dpy) {
    {
        Locker::Autolock _l(ctx->mDrawLock);
        ctx->dpyAttr[dpy].isConfiguring = true;
        ctx->dpyAttr[dpy].isActive = true;
        ctx->proc->invalidate(ctx->proc);
    }
    usleep(ctx->dpyAttr[HWC_DISPLAY_PRIMARY].vsync_period
            * 2 / 1000);
    //At this point external has all the pipes it would need.
    {
        Locker::Autolock _l(ctx->mDrawLock);
        ctx->dpyAttr[dpy].isPause = false;
        ctx->proc->invalidate(ctx->proc);
    }
    return;
}

/* Implementation for HWCVirtualV4L2 class */

int HWCVirtualV4L2::prepare(hwc_composer_device_1 *dev,
        hwc_display_contents_1_t *list) {
    ATRACE_CALL();

    hwc_context_t* ctx = (hwc_context_t*)(dev);
    const int dpy = HWC_DISPLAY_VIRTUAL;

    if (LIKELY(list && list->numHwLayers > 1) &&
            ctx->dpyAttr[dpy].isActive &&
            ctx->dpyAttr[dpy].connected &&
            canUseMDPforVirtualDisplay(ctx,list)) {
        reset_layer_prop(ctx, dpy, (int)list->numHwLayers - 1);
        if(!ctx->dpyAttr[dpy].isPause) {
            ctx->dpyAttr[dpy].isConfiguring = false;
            setListStats(ctx, list, dpy);
            if(ctx->mMDPComp[dpy]->prepare(ctx, list) < 0) {
                const int fbZ = 0;
                if(not ctx->mFBUpdate[dpy]->prepareAndValidate(ctx, list, fbZ))
                {
                    ctx->mOverlay->clear(dpy);
                    ctx->mLayerRotMap[dpy]->clear();
                }
            }
        } else {
            /* Virtual Display is in Pause state.
             * Mark all application layers as OVERLAY so that
             * GPU will not compose.
             */
            for(size_t i = 0 ;i < (size_t)(list->numHwLayers - 1); i++) {
                hwc_layer_1_t *layer = &list->hwLayers[i];
                layer->compositionType = HWC_OVERLAY;
            }
        }
    }
    return 0;
}

int HWCVirtualV4L2::set(hwc_context_t *ctx, hwc_display_contents_1_t *list) {
    ATRACE_CALL();
    int ret = 0;

    const int dpy = HWC_DISPLAY_VIRTUAL;

    if (LIKELY(list) && ctx->dpyAttr[dpy].isActive &&
            ctx->dpyAttr[dpy].connected &&
            (!ctx->dpyAttr[dpy].isPause) &&
            canUseMDPforVirtualDisplay(ctx,list)) {
        uint32_t last = (uint32_t)list->numHwLayers - 1;
        hwc_layer_1_t *fbLayer = &list->hwLayers[last];
        int fd = -1; //FenceFD from the Copybit(valid in async mode)
        bool copybitDone = false;
        if(ctx->mCopyBit[dpy])
            copybitDone = ctx->mCopyBit[dpy]->draw(ctx, list, dpy, &fd);

        if(list->numHwLayers > 1)
            hwc_sync(ctx, list, dpy, fd);

            // Dump the layers for virtual
            if(ctx->mHwcDebug[dpy])
                ctx->mHwcDebug[dpy]->dumpLayers(list);

        if (!ctx->mMDPComp[dpy]->draw(ctx, list)) {
            ALOGE("%s: MDPComp draw failed", __FUNCTION__);
            ret = -1;
        }

        int extOnlyLayerIndex =
            ctx->listStats[dpy].extOnlyLayerIndex;

        private_handle_t *hnd = (private_handle_t *)fbLayer->handle;
        if(extOnlyLayerIndex!= -1) {
            hwc_layer_1_t *extLayer = &list->hwLayers[extOnlyLayerIndex];
            hnd = (private_handle_t *)extLayer->handle;
        } else if(copybitDone) {
            hnd = ctx->mCopyBit[dpy]->getCurrentRenderBuffer();
        }

        if(hnd && !isYuvBuffer(hnd)) {
            if (!ctx->mFBUpdate[dpy]->draw(ctx, hnd)) {
                ALOGE("%s: FBUpdate::draw fail!", __FUNCTION__);
                ret = -1;
            }
        }

        if(!Overlay::displayCommit(ctx->dpyAttr[dpy].fd)) {
            ALOGE("%s: display commit fail for %d dpy!", __FUNCTION__, dpy);
            ret = -1;
        }
    }

    closeAcquireFds(list);

    if (list && list->outbuf && (list->retireFenceFd < 0) ) {
        // SF assumes HWC waits for the acquire fence and returns a new fence
        // that signals when we're done. Since we don't wait, and also don't
        // touch the buffer, we can just handle the acquire fence back to SF
        // as the retire fence.
        list->retireFenceFd = list->outbufAcquireFenceFd;
    }

    return ret;
}

void HWCVirtualV4L2::pause(hwc_context_t* ctx, int dpy) {
    {
        Locker::Autolock _l(ctx->mDrawLock);
        ctx->dpyAttr[dpy].isActive = true;
        ctx->dpyAttr[dpy].isPause = true;
        ctx->proc->invalidate(ctx->proc);
    }
    usleep(ctx->dpyAttr[HWC_DISPLAY_PRIMARY].vsync_period
            * 2 / 1000);
    // At this point all the pipes used by External have been
    // marked as UNSET.
    {
        Locker::Autolock _l(ctx->mDrawLock);
        // Perform commit to unstage the pipes.
        if (!Overlay::displayCommit(ctx->dpyAttr[dpy].fd)) {
            ALOGE("%s: display commit fail! for %d dpy",
                    __FUNCTION__, dpy);
        }
    }
    return;
}

void HWCVirtualV4L2::resume(hwc_context_t* ctx, int dpy){
    //Treat Resume as Online event
    //Since external didnt have any pipes, force primary to give up
    //its pipes; we don't allow inter-mixer pipe transfers.
    {
        Locker::Autolock _l(ctx->mDrawLock);

        // A dynamic resolution change (DRC) can be made for a WiFi
        // display. In order to support the resolution change, we
        // need to reconfigure the corresponding display attributes.
        // Since DRC is only on WiFi display, we only need to call
        // configure() on the VirtualDisplay device.
        //TODO: clean up
        if(dpy == HWC_DISPLAY_VIRTUAL)
            ctx->mVirtualDisplay->configure();

        ctx->dpyAttr[dpy].isConfiguring = true;
        ctx->dpyAttr[dpy].isActive = true;
        ctx->proc->invalidate(ctx->proc);
    }
    usleep(ctx->dpyAttr[HWC_DISPLAY_PRIMARY].vsync_period
            * 2 / 1000);
    //At this point external has all the pipes it would need.
    {
        Locker::Autolock _l(ctx->mDrawLock);
        ctx->dpyAttr[dpy].isPause = false;
        ctx->proc->invalidate(ctx->proc);
    }
    return;
}