libhwcomposer/hwc_mdpcomp.cpp

/*
 * Copyright (C) 2012-2015, 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 <math.h>
#include "hwc_mdpcomp.h"
#include <sys/ioctl.h>
#include <dlfcn.h>
#include "hdmi.h"
#include "qdMetaData.h"
#include "mdp_version.h"
#include "hwc_fbupdate.h"
#include "hwc_ad.h"
#include <overlayRotator.h>
#include "hwc_copybit.h"
#include "qd_utils.h"

using namespace overlay;
using namespace qdutils;
using namespace overlay::utils;
namespace ovutils = overlay::utils;

namespace qhwc {

//==============MDPComp========================================================

IdleInvalidator *MDPComp::sIdleInvalidator = NULL;
bool MDPComp::sIdleFallBack = false;
bool MDPComp::sDebugLogs = false;
bool MDPComp::sEnabled = false;
bool MDPComp::sEnableMixedMode = true;
int MDPComp::sSimulationFlags = 0;
int MDPComp::sMaxPipesPerMixer = 0;
bool MDPComp::sEnableYUVsplit = false;
bool MDPComp::sSrcSplitEnabled = false;
int MDPComp::sMaxSecLayers = 1;
bool MDPComp::enablePartialUpdateForMDP3 = false;
bool MDPComp::sIsPartialUpdateActive = true;
void *MDPComp::sLibPerfHint = NULL;
int MDPComp::sPerfLockHandle = 0;
int (*MDPComp::sPerfLockAcquire)(int, int, int*, int) = NULL;
int (*MDPComp::sPerfLockRelease)(int value) = NULL;
int MDPComp::sPerfHintWindow = -1;

MDPComp* MDPComp::getObject(hwc_context_t *ctx, const int& dpy) {
    if(qdutils::MDPVersion::getInstance().isSrcSplit()) {
        sSrcSplitEnabled = true;
        return new MDPCompSrcSplit(dpy);
    } else if(isDisplaySplit(ctx, dpy)) {
        return new MDPCompSplit(dpy);
    }
    return new MDPCompNonSplit(dpy);
}

MDPComp::MDPComp(int dpy):mDpy(dpy){};

void MDPComp::dump(android::String8& buf, hwc_context_t *ctx)
{
    if(mCurrentFrame.layerCount > MAX_NUM_APP_LAYERS)
        return;

    dumpsys_log(buf,"HWC Map for Dpy: %s \n",
                (mDpy == 0) ? "\"PRIMARY\"" :
                (mDpy == 1) ? "\"EXTERNAL\"" : "\"VIRTUAL\"");
    dumpsys_log(buf,"CURR_FRAME: layerCount:%2d mdpCount:%2d "
                "fbCount:%2d \n", mCurrentFrame.layerCount,
                mCurrentFrame.mdpCount, mCurrentFrame.fbCount);
    dumpsys_log(buf,"needsFBRedraw:%3s  pipesUsed:%2d  MaxPipesPerMixer: %d \n",
                (mCurrentFrame.needsRedraw? "YES" : "NO"),
                mCurrentFrame.mdpCount, sMaxPipesPerMixer);
    if(isDisplaySplit(ctx, mDpy)) {
        dumpsys_log(buf, "Programmed ROI's: Left: [%d, %d, %d, %d] "
                "Right: [%d, %d, %d, %d] \n",
                ctx->listStats[mDpy].lRoi.left, ctx->listStats[mDpy].lRoi.top,
                ctx->listStats[mDpy].lRoi.right,
                ctx->listStats[mDpy].lRoi.bottom,
                ctx->listStats[mDpy].rRoi.left,ctx->listStats[mDpy].rRoi.top,
                ctx->listStats[mDpy].rRoi.right,
                ctx->listStats[mDpy].rRoi.bottom);
    } else {
        dumpsys_log(buf, "Programmed ROI: [%d, %d, %d, %d] \n",
                ctx->listStats[mDpy].lRoi.left,ctx->listStats[mDpy].lRoi.top,
                ctx->listStats[mDpy].lRoi.right,
                ctx->listStats[mDpy].lRoi.bottom);
    }
    dumpsys_log(buf," ---------------------------------------------  \n");
    dumpsys_log(buf," listIdx | cached? | mdpIndex | comptype  |  Z  \n");
    dumpsys_log(buf," ---------------------------------------------  \n");
    for(int index = 0; index < mCurrentFrame.layerCount; index++ )
        dumpsys_log(buf," %7d | %7s | %8d | %9s | %2d \n",
                    index,
                    (mCurrentFrame.isFBComposed[index] ? "YES" : "NO"),
                     mCurrentFrame.layerToMDP[index],
                    (mCurrentFrame.isFBComposed[index] ?
                    (mCurrentFrame.drop[index] ? "DROP" :
                    (mCurrentFrame.needsRedraw ? "GLES" : "CACHE")) : "MDP"),
                    (mCurrentFrame.isFBComposed[index] ? mCurrentFrame.fbZ :
    mCurrentFrame.mdpToLayer[mCurrentFrame.layerToMDP[index]].pipeInfo->zOrder));
    dumpsys_log(buf,"\n");
}

bool MDPComp::init(hwc_context_t *ctx) {

    if(!ctx) {
        ALOGE("%s: Invalid hwc context!!",__FUNCTION__);
        return false;
    }

    char property[PROPERTY_VALUE_MAX] = {0};

    sEnabled = false;
    if((ctx->mMDP.version >= qdutils::MDP_V4_0) &&
       (property_get("persist.hwc.mdpcomp.enable", property, NULL) > 0) &&
       (!strncmp(property, "1", PROPERTY_VALUE_MAX ) ||
        (!strncasecmp(property,"true", PROPERTY_VALUE_MAX )))) {
        sEnabled = true;
    }

    sEnableMixedMode = true;
    if((property_get("debug.mdpcomp.mixedmode.disable", property, NULL) > 0) &&
       (!strncmp(property, "1", PROPERTY_VALUE_MAX ) ||
        (!strncasecmp(property,"true", PROPERTY_VALUE_MAX )))) {
        sEnableMixedMode = false;
    }

    qdutils::MDPVersion &mdpVersion = qdutils::MDPVersion::getInstance();

    sMaxPipesPerMixer = (int)mdpVersion.getBlendStages();
    if(property_get("persist.hwc.mdpcomp.maxpermixer", property, "-1") > 0) {
        int val = atoi(property);
        if(val >= 0)
            sMaxPipesPerMixer = min(val, sMaxPipesPerMixer);
    }

    /* Maximum layers allowed to use MDP on secondary panels. If property
     * doesn't exist, default to 1. Using the property it can be set to 0 or
     * more.
     */
    if(property_get("persist.hwc.maxseclayers", property, "1") > 0) {
        int val = atoi(property);
        sMaxSecLayers = (val >= 0) ? val : 1;
        sMaxSecLayers = min(sMaxSecLayers, sMaxPipesPerMixer);
    }

    if(ctx->mMDP.panel != MIPI_CMD_PANEL) {
        sIdleInvalidator = IdleInvalidator::getInstance();
        if(sIdleInvalidator->init(timeout_handler, ctx) < 0) {
            delete sIdleInvalidator;
            sIdleInvalidator = NULL;
        }
    }

    if(!qdutils::MDPVersion::getInstance().isSrcSplit() &&
        !qdutils::MDPVersion::getInstance().isRotDownscaleEnabled() &&
            property_get("persist.mdpcomp.4k2kSplit", property, "0") > 0 &&
            (!strncmp(property, "1", PROPERTY_VALUE_MAX) ||
            !strncasecmp(property,"true", PROPERTY_VALUE_MAX))) {
        sEnableYUVsplit = true;
    }

    bool defaultPTOR = false;
    //Enable PTOR when "persist.hwc.ptor.enable" is not defined for
    //8x16 and 8x39 targets by default
    if((property_get("persist.hwc.ptor.enable", property, NULL) <= 0) &&
            (qdutils::MDPVersion::getInstance().is8x16() ||
                qdutils::MDPVersion::getInstance().is8x39())) {
        defaultPTOR = true;
    }

    if (defaultPTOR || (!strncasecmp(property, "true", PROPERTY_VALUE_MAX)) ||
                (!strncmp(property, "1", PROPERTY_VALUE_MAX ))) {
        ctx->mCopyBit[HWC_DISPLAY_PRIMARY] = new CopyBit(ctx,
                                                    HWC_DISPLAY_PRIMARY);
    }

    if((property_get("persist.mdp3.partialUpdate", property, NULL) <= 0) &&
          (ctx->mMDP.version == qdutils::MDP_V3_0_5)) {
       enablePartialUpdateForMDP3 = true;
    }

    if(!enablePartialUpdateForMDP3 &&
          (!strncmp(property, "1", PROPERTY_VALUE_MAX ) ||
           (!strncasecmp(property,"true", PROPERTY_VALUE_MAX )))) {
       enablePartialUpdateForMDP3 = true;
    }

    sIsPartialUpdateActive = getPartialUpdatePref(ctx);

    if(property_get("persist.mdpcomp_perfhint", property, "-1") > 0) {
        int val = atoi(property);
        if(val > 0 && loadPerfLib()) {
            sPerfHintWindow = val;
            ALOGI("PerfHintWindow = %d", sPerfHintWindow);
        }
    }

    return true;
}

void MDPComp::reset(hwc_context_t *ctx) {
    const int numLayers = ctx->listStats[mDpy].numAppLayers;
    mCurrentFrame.reset(numLayers);
    ctx->mOverlay->clear(mDpy);
    ctx->mLayerRotMap[mDpy]->clear();
}

void MDPComp::reset() {
    mPrevModeOn = mModeOn;
    mModeOn = false;
}

void MDPComp::timeout_handler(void *udata) {
    struct hwc_context_t* ctx = (struct hwc_context_t*)(udata);
    bool handleTimeout = false;

    if(!ctx) {
        ALOGE("%s: received empty data in timer callback", __FUNCTION__);
        return;
    }

    ctx->mDrawLock.lock();

    /* Handle timeout event only if the previous composition
       on any display is MDP or MIXED*/
    for(int i = 0; i < HWC_NUM_DISPLAY_TYPES; i++) {
        if(ctx->mMDPComp[i])
            handleTimeout =
                    ctx->mMDPComp[i]->isMDPComp() || handleTimeout;
    }

    if(!handleTimeout) {
        ALOGD_IF(isDebug(), "%s:Do not handle this timeout", __FUNCTION__);
        ctx->mDrawLock.unlock();
        return;
    }
    if(!ctx->proc) {
        ALOGE("%s: HWC proc not registered", __FUNCTION__);
        ctx->mDrawLock.unlock();
        return;
    }
    sIdleFallBack = true;
    ctx->mDrawLock.unlock();
    /* Trigger SF to redraw the current frame */
    ctx->proc->invalidate(ctx->proc);
}

void MDPComp::setMaxPipesPerMixer(const uint32_t value) {
    qdutils::MDPVersion &mdpVersion = qdutils::MDPVersion::getInstance();
    uint32_t maxSupported = (int)mdpVersion.getBlendStages();
    if(value > maxSupported) {
        ALOGW("%s: Input exceeds max value supported. Setting to"
                "max value: %d", __FUNCTION__, maxSupported);
    }
    sMaxPipesPerMixer = min(value, maxSupported);
}

void MDPComp::setIdleTimeout(const uint32_t& timeout) {
    enum { ONE_REFRESH_PERIOD_MS = 17, ONE_BILLION_MS = 1000000000 };

    if(sIdleInvalidator) {
        if(timeout <= ONE_REFRESH_PERIOD_MS) {
            //If the specified timeout is < 1 draw cycle worth, "virtually"
            //disable idle timeout. The ideal way for clients to disable
            //timeout is to set it to 0
            sIdleInvalidator->setIdleTimeout(ONE_BILLION_MS);
            ALOGI("Disabled idle timeout");
            return;
        }
        sIdleInvalidator->setIdleTimeout(timeout);
        ALOGI("Idle timeout set to %u", timeout);
    } else {
        ALOGW("Cannot set idle timeout, IdleInvalidator not enabled");
    }
}

void MDPComp::setMDPCompLayerFlags(hwc_context_t *ctx,
                                   hwc_display_contents_1_t* list) {
    LayerProp *layerProp = ctx->layerProp[mDpy];

    for(int index = 0; index < ctx->listStats[mDpy].numAppLayers; index++) {
        hwc_layer_1_t* layer = &(list->hwLayers[index]);
        if(!mCurrentFrame.isFBComposed[index]) {
            layerProp[index].mFlags |= HWC_MDPCOMP;
            layer->compositionType = HWC_OVERLAY;
            layer->hints |= HWC_HINT_CLEAR_FB;
        } else {
            /* Drop the layer when its already present in FB OR when it lies
             * outside frame's ROI */
            if(!mCurrentFrame.needsRedraw || mCurrentFrame.drop[index]) {
                layer->compositionType = HWC_OVERLAY;
            }
        }
    }
}

void MDPComp::setRedraw(hwc_context_t *ctx,
        hwc_display_contents_1_t* list) {
    mCurrentFrame.needsRedraw = false;
    if(!mCachedFrame.isSameFrame(mCurrentFrame, list) ||
            (list->flags & HWC_GEOMETRY_CHANGED) ||
            isSkipPresent(ctx, mDpy)) {
        mCurrentFrame.needsRedraw = true;
    }
}

MDPComp::FrameInfo::FrameInfo() {
    memset(&mdpToLayer, 0, sizeof(mdpToLayer));
    reset(0);
}

void MDPComp::FrameInfo::reset(const int& numLayers) {
    for(int i = 0 ; i < MAX_NUM_BLEND_STAGES; i++ ) {
        if(mdpToLayer[i].pipeInfo) {
            delete mdpToLayer[i].pipeInfo;
            mdpToLayer[i].pipeInfo = NULL;
            //We dont own the rotator
            mdpToLayer[i].rot = NULL;
        }
    }

    memset(&mdpToLayer, 0, sizeof(mdpToLayer));
    memset(&layerToMDP, -1, sizeof(layerToMDP));
    memset(&isFBComposed, 1, sizeof(isFBComposed));

    layerCount = numLayers;
    fbCount = numLayers;
    mdpCount = 0;
    needsRedraw = true;
    fbZ = -1;
}

void MDPComp::FrameInfo::map() {
    // populate layer and MDP maps
    int mdpIdx = 0;
    for(int idx = 0; idx < layerCount; idx++) {
        if(!isFBComposed[idx]) {
            mdpToLayer[mdpIdx].listIndex = idx;
            layerToMDP[idx] = mdpIdx++;
        }
    }
}

MDPComp::LayerCache::LayerCache() {
    reset();
}

void MDPComp::LayerCache::reset() {
    memset(&hnd, 0, sizeof(hnd));
    memset(&isFBComposed, true, sizeof(isFBComposed));
    memset(&drop, false, sizeof(drop));
    layerCount = 0;
}

void MDPComp::LayerCache::cacheAll(hwc_display_contents_1_t* list) {
    const int numAppLayers = (int)list->numHwLayers - 1;
    for(int i = 0; i < numAppLayers; i++) {
        hnd[i] = list->hwLayers[i].handle;
    }
}

void MDPComp::LayerCache::updateCounts(const FrameInfo& curFrame) {
    layerCount = curFrame.layerCount;
    memcpy(&isFBComposed, &curFrame.isFBComposed, sizeof(isFBComposed));
    memcpy(&drop, &curFrame.drop, sizeof(drop));
}

bool MDPComp::LayerCache::isSameFrame(const FrameInfo& curFrame,
                                      hwc_display_contents_1_t* list) {
    if(layerCount != curFrame.layerCount)
        return false;
    for(int i = 0; i < curFrame.layerCount; i++) {
        if((curFrame.isFBComposed[i] != isFBComposed[i]) ||
                (curFrame.drop[i] != drop[i])) {
            return false;
        }
        if(curFrame.isFBComposed[i] &&
           (hnd[i] != list->hwLayers[i].handle)){
            return false;
        }
    }
    return true;
}

bool MDPComp::LayerCache::isSameFrame(hwc_context_t *ctx, int dpy,
                                      hwc_display_contents_1_t* list) {

    if(layerCount != ctx->listStats[dpy].numAppLayers)
        return false;

    if((list->flags & HWC_GEOMETRY_CHANGED) ||
       isSkipPresent(ctx, dpy)) {
        return false;
    }

    for(int i = 0; i < layerCount; i++) {
        if(hnd[i] != list->hwLayers[i].handle)
            return false;
    }

    return true;
}

bool MDPComp::isSupportedForMDPComp(hwc_context_t *ctx, hwc_layer_1_t* layer) {
    private_handle_t *hnd = (private_handle_t *)layer->handle;
    if((has90Transform(layer) and (not isRotationDoable(ctx, hnd))) ||
        (not isValidDimension(ctx,layer)) ||
        isSkipLayer(layer)) {
        //More conditions here, sRGB+Blend etc
        return false;
    }
    return true;
}

bool MDPComp::isValidDimension(hwc_context_t *ctx, hwc_layer_1_t *layer) {
    private_handle_t *hnd = (private_handle_t *)layer->handle;

    if(!hnd) {
        if (layer->flags & HWC_COLOR_FILL) {
            // Color layer
            return true;
        }
        ALOGD_IF(isDebug(), "%s: layer handle is NULL", __FUNCTION__);
        return false;
    }

    //XXX: Investigate doing this with pixel phase on MDSS
    if(!isSecureBuffer(hnd) && isNonIntegralSourceCrop(layer->sourceCropf))
        return false;

    hwc_rect_t crop = integerizeSourceCrop(layer->sourceCropf);
    hwc_rect_t dst = layer->displayFrame;
    bool rotated90 = (bool)(layer->transform & HAL_TRANSFORM_ROT_90);
    int crop_w = rotated90 ? crop.bottom - crop.top : crop.right - crop.left;
    int crop_h = rotated90 ? crop.right - crop.left : crop.bottom - crop.top;
    int dst_w = dst.right - dst.left;
    int dst_h = dst.bottom - dst.top;
    float w_scale = ((float)crop_w / (float)dst_w);
    float h_scale = ((float)crop_h / (float)dst_h);
    MDPVersion& mdpHw = MDPVersion::getInstance();

    /* Workaround for MDP HW limitation in DSI command mode panels where
     * FPS will not go beyond 30 if buffers on RGB pipes are of width or height
     * less than 5 pixels
     * There also is a HW limilation in MDP, minimum block size is 2x2
     * Fallback to GPU if height is less than 2.
     */
    if(mdpHw.hasMinCropWidthLimitation() and (crop_w < 5 or crop_h < 5))
        return false;

    /* crop_w and crop_h should be even for yuv layer, so fallback to GPU for
     * those cases
     */
    if(isYuvBuffer(hnd) && (crop_w < 2 || crop_h < 2)) {
        return false;
    }

    if((w_scale > 1.0f) || (h_scale > 1.0f)) {
        const uint32_t maxMDPDownscale = mdpHw.getMaxMDPDownscale();
        const float w_dscale = w_scale;
        const float h_dscale = h_scale;

        if(ctx->mMDP.version >= qdutils::MDSS_V5) {

            if(!mdpHw.supportsDecimation()) {
                /* On targets that doesnt support Decimation (eg.,8x26)
                 * maximum downscale support is overlay pipe downscale.
                 */
                if(crop_w > (int) mdpHw.getMaxPipeWidth() ||
                        w_dscale > maxMDPDownscale ||
                        h_dscale > maxMDPDownscale)
                    return false;
            } else {
                // Decimation on macrotile format layers is not supported.
                if(isTileRendered(hnd)) {
                    /* Bail out if
                     *      1. Src crop > Mixer limit on nonsplit MDPComp
                     *      2. exceeds maximum downscale limit
                     */
                    if(((crop_w > (int) mdpHw.getMaxPipeWidth()) &&
                                !sSrcSplitEnabled) ||
                            w_dscale > maxMDPDownscale ||
                            h_dscale > maxMDPDownscale) {
                        return false;
                    }
                } else if(w_dscale > 64 || h_dscale > 64)
                    return false;
            }
        } else { //A-family
            if(w_dscale > maxMDPDownscale || h_dscale > maxMDPDownscale)
                return false;
        }
    }

    if((w_scale < 1.0f) || (h_scale < 1.0f)) {
        const uint32_t upscale = mdpHw.getMaxMDPUpscale();
        const float w_uscale = 1.0f / w_scale;
        const float h_uscale = 1.0f / h_scale;

        if(w_uscale > upscale || h_uscale > upscale)
            return false;
    }

    return true;
}

bool MDPComp::isFrameDoable(hwc_context_t *ctx) {
    bool ret = true;

    if(!isEnabled()) {
        ALOGD_IF(isDebug(),"%s: MDP Comp. not enabled.", __FUNCTION__);
        ret = false;
    } else if((qdutils::MDPVersion::getInstance().is8x26() ||
               qdutils::MDPVersion::getInstance().is8x16() ||
               qdutils::MDPVersion::getInstance().is8x39()) &&
            ctx->mVideoTransFlag &&
            isSecondaryConnected(ctx)) {
        //1 Padding round to shift pipes across mixers
        ALOGD_IF(isDebug(),"%s: MDP Comp. video transition padding round",
                __FUNCTION__);
        ret = false;
    } else if(qdutils::MDPVersion::getInstance().getTotalPipes() < 8) {
       /* TODO: freeing up all the resources only for the targets having total
                number of pipes < 8. Need to analyze number of VIG pipes used
                for primary in previous draw cycle and accordingly decide
                whether to fall back to full GPU comp or video only comp
        */
        if(isSecondaryConfiguring(ctx)) {
            ALOGD_IF( isDebug(),"%s: External Display connection is pending",
                      __FUNCTION__);
            ret = false;
        } else if(ctx->isPaddingRound) {
            ALOGD_IF(isDebug(), "%s: padding round invoked for dpy %d",
                     __FUNCTION__,mDpy);
            ret = false;
        }
    } else if (ctx->isDMAStateChanging) {
        // Bail out if a padding round has been invoked in order to switch DMA
        // state to block mode. We need this to cater for the case when a layer
        // requires rotation in the current frame.
        ALOGD_IF(isDebug(), "%s: padding round invoked to switch DMA state",
                __FUNCTION__);
        return false;
    }

    return ret;
}

void MDPCompNonSplit::trimAgainstROI(hwc_context_t *ctx, hwc_rect &crop,
        hwc_rect &dst) {
    hwc_rect_t roi = ctx->listStats[mDpy].lRoi;
    dst = getIntersection(dst, roi);
    crop = dst;
}

/* 1) Identify layers that are not visible or lying outside the updating ROI and
 *    drop them from composition.
 * 2) If we have a scaling layer which needs cropping against generated
 *    ROI, reset ROI to full resolution. */
bool MDPCompNonSplit::validateAndApplyROI(hwc_context_t *ctx,
        hwc_display_contents_1_t* list) {
    int numAppLayers = ctx->listStats[mDpy].numAppLayers;
    hwc_rect_t visibleRect = ctx->listStats[mDpy].lRoi;

    for(int i = numAppLayers - 1; i >= 0; i--){
        if(!isValidRect(visibleRect)) {
            mCurrentFrame.drop[i] = true;
            mCurrentFrame.dropCount++;
            continue;
        }

        const hwc_layer_1_t* layer =  &list->hwLayers[i];
        hwc_rect_t dstRect = layer->displayFrame;
        hwc_rect_t res  = getIntersection(visibleRect, dstRect);

        if(!isValidRect(res)) {
            mCurrentFrame.drop[i] = true;
            mCurrentFrame.dropCount++;
        } else {
            /* Reset frame ROI when any layer which needs scaling also needs ROI
             * cropping */
            if(!isSameRect(res, dstRect) && needsScaling (layer)) {
                ALOGI("%s: Resetting ROI due to scaling", __FUNCTION__);
                memset(&mCurrentFrame.drop, 0, sizeof(mCurrentFrame.drop));
                mCurrentFrame.dropCount = 0;
                return false;
            }

            /* deduct any opaque region from visibleRect */
            if (layer->blending == HWC_BLENDING_NONE &&
                    layer->planeAlpha == 0xFF)
                visibleRect = deductRect(visibleRect, res);
        }
    }
    return true;
}

/* Calculate ROI for the frame by accounting all the layer's dispalyFrame which
 * are updating. If DirtyRegion is applicable, calculate it by accounting all
 * the changing layer's dirtyRegion. */
void MDPCompNonSplit::generateROI(hwc_context_t *ctx,
        hwc_display_contents_1_t* list) {
    int numAppLayers = ctx->listStats[mDpy].numAppLayers;
    if(!canPartialUpdate(ctx, list))
        return;

    struct hwc_rect roi = (struct hwc_rect){0, 0, 0, 0};
    hwc_rect fullFrame = (struct hwc_rect) {0, 0,(int)ctx->dpyAttr[mDpy].xres,
        (int)ctx->dpyAttr[mDpy].yres};

    for(int index = 0; index < numAppLayers; index++ ) {
        hwc_layer_1_t* layer = &list->hwLayers[index];
        if ((mCachedFrame.hnd[index] != layer->handle) ||
                isYuvBuffer((private_handle_t *)layer->handle)) {
            hwc_rect_t dst = layer->displayFrame;
            hwc_rect_t updatingRect = dst;

#ifdef QCOM_BSP
            if(!needsScaling(layer) && !layer->transform &&
                   (!isYuvBuffer((private_handle_t *)layer->handle)))
            {
                hwc_rect_t src = integerizeSourceCrop(layer->sourceCropf);
                int x_off = dst.left - src.left;
                int y_off = dst.top - src.top;
                updatingRect = moveRect(layer->dirtyRect, x_off, y_off);
            }
#endif

            roi = getUnion(roi, updatingRect);
        }
    }

    /* No layer is updating. Still SF wants a refresh.*/
    if(!isValidRect(roi))
        return;

    // Align ROI coordinates to panel restrictions
    roi = getSanitizeROI(roi, fullFrame);

    ctx->listStats[mDpy].lRoi = roi;
    if(!validateAndApplyROI(ctx, list))
        resetROI(ctx, mDpy);

    ALOGD_IF(isDebug(),"%s: generated ROI: [%d, %d, %d, %d]", __FUNCTION__,
            ctx->listStats[mDpy].lRoi.left, ctx->listStats[mDpy].lRoi.top,
            ctx->listStats[mDpy].lRoi.right, ctx->listStats[mDpy].lRoi.bottom);
}

void MDPCompSplit::trimAgainstROI(hwc_context_t *ctx, hwc_rect &crop,
        hwc_rect &dst) {
    hwc_rect roi = getUnion(ctx->listStats[mDpy].lRoi,
            ctx->listStats[mDpy].rRoi);
    hwc_rect tmpDst = getIntersection(dst, roi);
    if(!isSameRect(dst, tmpDst)) {
        crop.left = crop.left + (tmpDst.left - dst.left);
        crop.top = crop.top + (tmpDst.top - dst.top);
        crop.right = crop.left + (tmpDst.right - tmpDst.left);
        crop.bottom = crop.top + (tmpDst.bottom - tmpDst.top);
        dst = tmpDst;
    }
}

/* 1) Identify layers that are not visible or lying outside BOTH the updating
 *    ROI's and drop them from composition. If a layer is spanning across both
 *    the halves of the screen but needed by only ROI, the non-contributing
 *    half will not be programmed for MDP.
 * 2) If we have a scaling layer which needs cropping against generated
 *    ROI, reset ROI to full resolution. */
bool MDPCompSplit::validateAndApplyROI(hwc_context_t *ctx,
        hwc_display_contents_1_t* list) {

    int numAppLayers = ctx->listStats[mDpy].numAppLayers;

    hwc_rect_t visibleRectL = ctx->listStats[mDpy].lRoi;
    hwc_rect_t visibleRectR = ctx->listStats[mDpy].rRoi;

    for(int i = numAppLayers - 1; i >= 0; i--){
        if(!isValidRect(visibleRectL) && !isValidRect(visibleRectR))
        {
            mCurrentFrame.drop[i] = true;
            mCurrentFrame.dropCount++;
            continue;
        }

        const hwc_layer_1_t* layer =  &list->hwLayers[i];
        hwc_rect_t dstRect = layer->displayFrame;

        hwc_rect_t l_res  = getIntersection(visibleRectL, dstRect);
        hwc_rect_t r_res  = getIntersection(visibleRectR, dstRect);
        hwc_rect_t res = getUnion(l_res, r_res);

        if(!isValidRect(l_res) && !isValidRect(r_res)) {
            mCurrentFrame.drop[i] = true;
            mCurrentFrame.dropCount++;
        } else {
            /* Reset frame ROI when any layer which needs scaling also needs ROI
             * cropping */
            if(!isSameRect(res, dstRect) && needsScaling (layer)) {
                memset(&mCurrentFrame.drop, 0, sizeof(mCurrentFrame.drop));
                mCurrentFrame.dropCount = 0;
                return false;
            }

            if (layer->blending == HWC_BLENDING_NONE &&
                    layer->planeAlpha == 0xFF) {
                visibleRectL = deductRect(visibleRectL, l_res);
                visibleRectR = deductRect(visibleRectR, r_res);
            }
        }
    }
    return true;
}
/* Calculate ROI for the frame by accounting all the layer's dispalyFrame which
 * are updating. If DirtyRegion is applicable, calculate it by accounting all
 * the changing layer's dirtyRegion. */
void MDPCompSplit::generateROI(hwc_context_t *ctx,
        hwc_display_contents_1_t* list) {
    if(!canPartialUpdate(ctx, list))
        return;

    int numAppLayers = ctx->listStats[mDpy].numAppLayers;
    int lSplit = getLeftSplit(ctx, mDpy);

    int hw_h = (int)ctx->dpyAttr[mDpy].yres;
    int hw_w = (int)ctx->dpyAttr[mDpy].xres;

    struct hwc_rect l_frame = (struct hwc_rect){0, 0, lSplit, hw_h};
    struct hwc_rect r_frame = (struct hwc_rect){lSplit, 0, hw_w, hw_h};

    struct hwc_rect l_roi = (struct hwc_rect){0, 0, 0, 0};
    struct hwc_rect r_roi = (struct hwc_rect){0, 0, 0, 0};

    for(int index = 0; index < numAppLayers; index++ ) {
        hwc_layer_1_t* layer = &list->hwLayers[index];
        private_handle_t *hnd = (private_handle_t *)layer->handle;
        if ((mCachedFrame.hnd[index] != layer->handle) ||
                isYuvBuffer(hnd)) {
            hwc_rect_t dst = layer->displayFrame;
            hwc_rect_t updatingRect = dst;

#ifdef QCOM_BSP
            if(!needsScaling(layer) && !layer->transform)
            {
                hwc_rect_t src = integerizeSourceCrop(layer->sourceCropf);
                int x_off = dst.left - src.left;
                int y_off = dst.top - src.top;
                updatingRect = moveRect(layer->dirtyRect, x_off, y_off);
            }
#endif

            hwc_rect_t l_dst  = getIntersection(l_frame, updatingRect);
            if(isValidRect(l_dst))
                l_roi = getUnion(l_roi, l_dst);

            hwc_rect_t r_dst  = getIntersection(r_frame, updatingRect);
            if(isValidRect(r_dst))
                r_roi = getUnion(r_roi, r_dst);
        }
    }

    /* For panels that cannot accept commands in both the interfaces, we cannot
     * send two ROI's (for each half). We merge them into single ROI and split
     * them across lSplit for MDP mixer use. The ROI's will be merged again
     * finally before udpating the panel in the driver. */
    if(qdutils::MDPVersion::getInstance().needsROIMerge()) {
        hwc_rect_t temp_roi = getUnion(l_roi, r_roi);
        l_roi = getIntersection(temp_roi, l_frame);
        r_roi = getIntersection(temp_roi, r_frame);
    }

    /* No layer is updating. Still SF wants a refresh. */
    if(!isValidRect(l_roi) && !isValidRect(r_roi))
        return;

    l_roi = getSanitizeROI(l_roi, l_frame);
    r_roi = getSanitizeROI(r_roi, r_frame);

    ctx->listStats[mDpy].lRoi = l_roi;
    ctx->listStats[mDpy].rRoi = r_roi;

    if(!validateAndApplyROI(ctx, list))
        resetROI(ctx, mDpy);

    ALOGD_IF(isDebug(),"%s: generated L_ROI: [%d, %d, %d, %d]"
            "R_ROI: [%d, %d, %d, %d]", __FUNCTION__,
            ctx->listStats[mDpy].lRoi.left, ctx->listStats[mDpy].lRoi.top,
            ctx->listStats[mDpy].lRoi.right, ctx->listStats[mDpy].lRoi.bottom,
            ctx->listStats[mDpy].rRoi.left, ctx->listStats[mDpy].rRoi.top,
            ctx->listStats[mDpy].rRoi.right, ctx->listStats[mDpy].rRoi.bottom);
}

/* Checks for conditions where all the layers marked for MDP comp cannot be
 * bypassed. On such conditions we try to bypass atleast YUV layers */
bool MDPComp::tryFullFrame(hwc_context_t *ctx,
                                hwc_display_contents_1_t* list){

    const int numAppLayers = ctx->listStats[mDpy].numAppLayers;

    // Fall back to video only composition, if AIV video mode is enabled
    if(ctx->listStats[mDpy].mAIVVideoMode) {
        ALOGD_IF(isDebug(), "%s: AIV Video Mode enabled dpy %d",
            __FUNCTION__, mDpy);
        return false;
    }

    /* No Idle fall back if secure display or secure RGB layers are present
     * or if there is only a single layer being composed */
    if(sIdleFallBack && !ctx->listStats[mDpy].secureUI &&
                  !ctx->listStats[mDpy].secureRGBCount &&
                  (ctx->listStats[mDpy].numAppLayers > 1)) {
        ALOGD_IF(isDebug(), "%s: Idle fallback dpy %d",__FUNCTION__, mDpy);
        return false;
    }

    // if secondary is configuring or Padding round, fall back to video only
    // composition and release all assigned non VIG pipes from primary.
    if(isSecondaryConfiguring(ctx)) {
        ALOGD_IF( isDebug(),"%s: External Display connection is pending",
                  __FUNCTION__);
        return false;
    } else if(ctx->isPaddingRound) {
        ALOGD_IF(isDebug(), "%s: padding round invoked for dpy %d",
                 __FUNCTION__,mDpy);
        return false;
    }

    // No MDP composition for 3D
    if(needs3DComposition(ctx, mDpy))
        return false;

    // check for action safe flag and MDP scaling mode which requires scaling.
    if(ctx->dpyAttr[mDpy].mActionSafePresent
            || ctx->dpyAttr[mDpy].mMDPScalingMode) {
        ALOGD_IF(isDebug(), "%s: Scaling needed for this frame",__FUNCTION__);
        return false;
    }

    for(int i = 0; i < numAppLayers; ++i) {
        hwc_layer_1_t* layer = &list->hwLayers[i];
        private_handle_t *hnd = (private_handle_t *)layer->handle;

        if(has90Transform(layer) && isRotationDoable(ctx, hnd)) {
            if(!canUseRotator(ctx, mDpy)) {
                ALOGD_IF(isDebug(), "%s: Can't use rotator for dpy %d",
                        __FUNCTION__, mDpy);
                return false;
            }
        }

        //For 8x26 with panel width>1k, if RGB layer needs HFLIP fail mdp comp
        // may not need it if Gfx pre-rotation can handle all flips & rotations
        MDPVersion& mdpHw = MDPVersion::getInstance();
        int transform = (layer->flags & HWC_COLOR_FILL) ? 0 : layer->transform;
        if( mdpHw.is8x26() && (ctx->dpyAttr[mDpy].xres > 1024) &&
                (transform & HWC_TRANSFORM_FLIP_H) && (!isYuvBuffer(hnd)))
            return false;
    }

    if(ctx->mAD->isDoable()) {
        return false;
    }

    //If all above hard conditions are met we can do full or partial MDP comp.
    bool ret = false;
    if(fullMDPComp(ctx, list)) {
        ret = true;
    } else if(fullMDPCompWithPTOR(ctx, list)) {
        ret = true;
    } else if(partialMDPComp(ctx, list)) {
        ret = true;
    }

    return ret;
}

bool MDPComp::fullMDPComp(hwc_context_t *ctx, hwc_display_contents_1_t* list) {

    if(sSimulationFlags & MDPCOMP_AVOID_FULL_MDP)
        return false;

    const int numAppLayers = ctx->listStats[mDpy].numAppLayers;
    for(int i = 0; i < numAppLayers; i++) {
        hwc_layer_1_t* layer = &list->hwLayers[i];
        if(not mCurrentFrame.drop[i] and
           not isSupportedForMDPComp(ctx, layer)) {
            ALOGD_IF(isDebug(), "%s: Unsupported layer in list",__FUNCTION__);
            return false;
        }
    }

    mCurrentFrame.fbCount = 0;
    memcpy(&mCurrentFrame.isFBComposed, &mCurrentFrame.drop,
           sizeof(mCurrentFrame.isFBComposed));
    mCurrentFrame.mdpCount = mCurrentFrame.layerCount - mCurrentFrame.fbCount -
        mCurrentFrame.dropCount;

    if(sEnableYUVsplit){
        adjustForSourceSplit(ctx, list);
    }

    if(!postHeuristicsHandling(ctx, list)) {
        ALOGD_IF(isDebug(), "post heuristic handling failed");
        reset(ctx);
        return false;
    }
    ALOGD_IF(sSimulationFlags,"%s: FULL_MDP_COMP SUCCEEDED",
             __FUNCTION__);
    return true;
}

/* Full MDP Composition with Peripheral Tiny Overlap Removal.
 * MDP bandwidth limitations can be avoided, if the overlap region
 * covered by the smallest layer at a higher z-order, gets composed
 * by Copybit on a render buffer, which can be queued to MDP.
 */
bool MDPComp::fullMDPCompWithPTOR(hwc_context_t *ctx,
    hwc_display_contents_1_t* list) {

    const int numAppLayers = ctx->listStats[mDpy].numAppLayers;
    const int stagesForMDP = min(sMaxPipesPerMixer,
            ctx->mOverlay->availablePipes(mDpy, Overlay::MIXER_DEFAULT));

    // Hard checks where we cannot use this mode
    if (mDpy || !ctx->mCopyBit[mDpy]) {
        ALOGD_IF(isDebug(), "%s: Feature not supported!", __FUNCTION__);
        return false;
    }

    // Frame level checks
    if ((numAppLayers > stagesForMDP) || isSkipPresent(ctx, mDpy) ||
        isYuvPresent(ctx, mDpy) || mCurrentFrame.dropCount ||
        isSecurePresent(ctx, mDpy)) {
        ALOGD_IF(isDebug(), "%s: Frame not supported!", __FUNCTION__);
        return false;
    }
    // MDP comp checks
    for(int i = 0; i < numAppLayers; i++) {
        hwc_layer_1_t* layer = &list->hwLayers[i];
        if(not isSupportedForMDPComp(ctx, layer)) {
            ALOGD_IF(isDebug(), "%s: Unsupported layer in list",__FUNCTION__);
            return false;
        }
    }

    /* We cannot use this composition mode, if:
     1. A below layer needs scaling.
     2. Overlap is not peripheral to display.
     3. Overlap or a below layer has 90 degree transform.
     4. Overlap area > (1/3 * FrameBuffer) area, based on Perf inputs.
     */

    int minLayerIndex[MAX_PTOR_LAYERS] = { -1, -1};
    hwc_rect_t overlapRect[MAX_PTOR_LAYERS];
    memset(overlapRect, 0, sizeof(overlapRect));
    int layerPixelCount, minPixelCount = 0;
    int numPTORLayersFound = 0;
    for (int i = numAppLayers-1; (i >= 0 &&
                                  numPTORLayersFound < MAX_PTOR_LAYERS); i--) {
        hwc_layer_1_t* layer = &list->hwLayers[i];
        hwc_rect_t crop = integerizeSourceCrop(layer->sourceCropf);
        hwc_rect_t dispFrame = layer->displayFrame;
        layerPixelCount = (crop.right - crop.left) * (crop.bottom - crop.top);
        // PTOR layer should be peripheral and cannot have transform
        if (!isPeripheral(dispFrame, ctx->mViewFrame[mDpy]) ||
                                has90Transform(layer)) {
            continue;
        }
        if((3 * (layerPixelCount + minPixelCount)) >
                ((int)ctx->dpyAttr[mDpy].xres * (int)ctx->dpyAttr[mDpy].yres)) {
            // Overlap area > (1/3 * FrameBuffer) area, based on Perf inputs.
            continue;
        }
        bool found = false;
        for (int j = i-1; j >= 0; j--) {
            // Check if the layers below this layer qualifies for PTOR comp
            hwc_layer_1_t* layer = &list->hwLayers[j];
            hwc_rect_t disFrame = layer->displayFrame;
            // Layer below PTOR is intersecting and has 90 degree transform or
            // needs scaling cannot be supported.
            if (isValidRect(getIntersection(dispFrame, disFrame))) {
                if (has90Transform(layer) || needsScaling(layer)) {
                    found = false;
                    break;
                }
                found = true;
            }
        }
        // Store the minLayer Index
        if(found) {
            minLayerIndex[numPTORLayersFound] = i;
            overlapRect[numPTORLayersFound] = list->hwLayers[i].displayFrame;
            minPixelCount += layerPixelCount;
            numPTORLayersFound++;
        }
    }

    // No overlap layers
    if (!numPTORLayersFound)
        return false;

    // Store the displayFrame and the sourceCrops of the layers
    hwc_rect_t displayFrame[numAppLayers];
    hwc_rect_t sourceCrop[numAppLayers];
    for(int i = 0; i < numAppLayers; i++) {
        hwc_layer_1_t* layer = &list->hwLayers[i];
        displayFrame[i] = layer->displayFrame;
        sourceCrop[i] = integerizeSourceCrop(layer->sourceCropf);
    }

    /**
     * It's possible that 2 PTOR layers might have overlapping.
     * In such case, remove the intersection(again if peripheral)
     * from the lower PTOR layer to avoid overlapping.
     * If intersection is not on peripheral then compromise
     * by reducing number of PTOR layers.
     **/
    hwc_rect_t commonRect = getIntersection(overlapRect[0], overlapRect[1]);
    if(isValidRect(commonRect)) {
        overlapRect[1] = deductRect(overlapRect[1], commonRect);
        list->hwLayers[minLayerIndex[1]].displayFrame = overlapRect[1];
    }

    ctx->mPtorInfo.count = numPTORLayersFound;
    for(int i = 0; i < MAX_PTOR_LAYERS; i++) {
        ctx->mPtorInfo.layerIndex[i] = minLayerIndex[i];
    }

    if (!ctx->mCopyBit[mDpy]->prepareOverlap(ctx, list)) {
        // reset PTOR
        ctx->mPtorInfo.count = 0;
        if(isValidRect(commonRect)) {
            // If PTORs are intersecting restore displayframe of PTOR[1]
            // before returning, as we have modified it above.
            list->hwLayers[minLayerIndex[1]].displayFrame =
                    displayFrame[minLayerIndex[1]];
        }
        return false;
    }
    private_handle_t *renderBuf = ctx->mCopyBit[mDpy]->getCurrentRenderBuffer();
    Whf layerWhf[numPTORLayersFound]; // To store w,h,f of PTOR layers

    // Store the blending mode, planeAlpha, and transform of PTOR layers
    int32_t blending[numPTORLayersFound];
    uint8_t planeAlpha[numPTORLayersFound];
    uint32_t transform[numPTORLayersFound];

    for(int j = 0; j < numPTORLayersFound; j++) {
        int index =  ctx->mPtorInfo.layerIndex[j];

        // Update src crop of PTOR layer
        hwc_layer_1_t* layer = &list->hwLayers[index];
        layer->sourceCropf.left = (float)ctx->mPtorInfo.displayFrame[j].left;
        layer->sourceCropf.top = (float)ctx->mPtorInfo.displayFrame[j].top;
        layer->sourceCropf.right = (float)ctx->mPtorInfo.displayFrame[j].right;
        layer->sourceCropf.bottom =(float)ctx->mPtorInfo.displayFrame[j].bottom;

        // Store & update w, h, format of PTOR layer
        private_handle_t *hnd = (private_handle_t *)layer->handle;
        Whf whf(hnd->width, hnd->height, hnd->format, hnd->size);
        layerWhf[j] = whf;
        hnd->width = renderBuf->width;
        hnd->height = renderBuf->height;
        hnd->format = renderBuf->format;

        // Store & update blending mode, planeAlpha and transform of PTOR layer
        blending[j] = layer->blending;
        planeAlpha[j] = layer->planeAlpha;
        transform[j] = layer->transform;
        layer->blending = HWC_BLENDING_NONE;
        layer->planeAlpha = 0xFF;
        layer->transform = 0;

        // Remove overlap from crop & displayFrame of below layers
        for (int i = 0; i < index && index !=-1; i++) {
            layer = &list->hwLayers[i];
            if(!isValidRect(getIntersection(layer->displayFrame,
                                            overlapRect[j])))  {
                continue;
            }
            // Update layer attributes
            hwc_rect_t srcCrop = integerizeSourceCrop(layer->sourceCropf);
            hwc_rect_t destRect = deductRect(layer->displayFrame,
                        getIntersection(layer->displayFrame, overlapRect[j]));
            qhwc::calculate_crop_rects(srcCrop, layer->displayFrame, destRect,
                                       layer->transform);
            layer->sourceCropf.left = (float)srcCrop.left;
            layer->sourceCropf.top = (float)srcCrop.top;
            layer->sourceCropf.right = (float)srcCrop.right;
            layer->sourceCropf.bottom = (float)srcCrop.bottom;
        }
    }

    mCurrentFrame.mdpCount = numAppLayers;
    mCurrentFrame.fbCount = 0;
    mCurrentFrame.fbZ = -1;

    for (int j = 0; j < numAppLayers; j++) {
        if(isValidRect(list->hwLayers[j].displayFrame)) {
            mCurrentFrame.isFBComposed[j] = false;
        } else {
            mCurrentFrame.mdpCount--;
            mCurrentFrame.drop[j] = true;
        }
    }

    bool result = postHeuristicsHandling(ctx, list);

    // Restore layer attributes
    for(int i = 0; i < numAppLayers; i++) {
        hwc_layer_1_t* layer = &list->hwLayers[i];
        layer->displayFrame = displayFrame[i];
        layer->sourceCropf.left = (float)sourceCrop[i].left;
        layer->sourceCropf.top = (float)sourceCrop[i].top;
        layer->sourceCropf.right = (float)sourceCrop[i].right;
        layer->sourceCropf.bottom = (float)sourceCrop[i].bottom;
    }

    // Restore w,h,f, blending attributes, and transform of PTOR layers
    for (int i = 0; i < numPTORLayersFound; i++) {
        int idx = ctx->mPtorInfo.layerIndex[i];
        hwc_layer_1_t* layer = &list->hwLayers[idx];
        private_handle_t *hnd = (private_handle_t *)list->hwLayers[idx].handle;
        hnd->width = layerWhf[i].w;
        hnd->height = layerWhf[i].h;
        hnd->format = layerWhf[i].format;
        layer->blending = blending[i];
        layer->planeAlpha = planeAlpha[i];
        layer->transform = transform[i];
    }

    if (!result) {
        // reset PTOR
        ctx->mPtorInfo.count = 0;
        reset(ctx);
    } else {
        ALOGD_IF(isDebug(), "%s: PTOR Indexes: %d and %d", __FUNCTION__,
                 ctx->mPtorInfo.layerIndex[0],  ctx->mPtorInfo.layerIndex[1]);
    }

    ALOGD_IF(isDebug(), "%s: Postheuristics %s!", __FUNCTION__,
             (result ? "successful" : "failed"));
    return result;
}

bool MDPComp::partialMDPComp(hwc_context_t *ctx, hwc_display_contents_1_t* list)
{
    if(!sEnableMixedMode || !isAlphaPresentinFB(ctx, mDpy)) {
        //Mixed mode is disabled/can't be used. No need to even try caching.
        return false;
    }

    bool ret = false;
    if(isSkipPresent(ctx, mDpy) or list->flags & HWC_GEOMETRY_CHANGED) {
        //Try load based first
        ret =   loadBasedComp(ctx, list) or
                cacheBasedComp(ctx, list);
    } else {
        ret =   cacheBasedComp(ctx, list) or
                loadBasedComp(ctx, list);
    }

    return ret;
}

bool MDPComp::cacheBasedComp(hwc_context_t *ctx,
        hwc_display_contents_1_t* list) {
    if(sSimulationFlags & MDPCOMP_AVOID_CACHE_MDP)
        return false;

    int numAppLayers = ctx->listStats[mDpy].numAppLayers;
    mCurrentFrame.reset(numAppLayers);
    updateLayerCache(ctx, list, mCurrentFrame);

    //If an MDP marked layer is unsupported cannot do partial MDP Comp
    for(int i = 0; i < numAppLayers; i++) {
        if(!mCurrentFrame.isFBComposed[i]) {
            hwc_layer_1_t* layer = &list->hwLayers[i];
            if(not isSupportedForMDPComp(ctx, layer)) {
                ALOGD_IF(isDebug(), "%s: Unsupported layer in list",
                        __FUNCTION__);
                reset(ctx);
                return false;
            }
        }
    }

    updateYUV(ctx, list, false /*secure only*/, mCurrentFrame);
    /* mark secure RGB layers for MDP comp */
    updateSecureRGB(ctx, list);
    bool ret = markLayersForCaching(ctx, list); //sets up fbZ also
    if(!ret) {
        ALOGD_IF(isDebug(),"%s: batching failed, dpy %d",__FUNCTION__, mDpy);
        reset(ctx);
        return false;
    }

    int mdpCount = mCurrentFrame.mdpCount;

    if(sEnableYUVsplit){
        adjustForSourceSplit(ctx, list);
    }

    if(!postHeuristicsHandling(ctx, list)) {
        ALOGD_IF(isDebug(), "post heuristic handling failed");
        reset(ctx);
        return false;
    }
    ALOGD_IF(sSimulationFlags,"%s: CACHE_MDP_COMP SUCCEEDED",
             __FUNCTION__);

    return true;
}

bool MDPComp::loadBasedComp(hwc_context_t *ctx,
        hwc_display_contents_1_t* list) {
    if(sSimulationFlags & MDPCOMP_AVOID_LOAD_MDP)
        return false;

    if(not isLoadBasedCompDoable(ctx)) {
        return false;
    }

    const int numAppLayers = ctx->listStats[mDpy].numAppLayers;
    const int numNonDroppedLayers = numAppLayers - mCurrentFrame.dropCount;
    const int stagesForMDP = min(sMaxPipesPerMixer,
            ctx->mOverlay->availablePipes(mDpy, Overlay::MIXER_DEFAULT));

    int mdpBatchSize = stagesForMDP - 1; //1 stage for FB
    int fbBatchSize = numNonDroppedLayers - mdpBatchSize;
    int lastMDPSupportedIndex = numAppLayers;
    int dropCount = 0;

    //Find the minimum MDP batch size
    for(int i = 0; i < numAppLayers;i++) {
        if(mCurrentFrame.drop[i]) {
            dropCount++;
            continue;
        }
        hwc_layer_1_t* layer = &list->hwLayers[i];
        if(not isSupportedForMDPComp(ctx, layer)) {
            lastMDPSupportedIndex = i;
            mdpBatchSize = min(i - dropCount, stagesForMDP - 1);
            fbBatchSize = numNonDroppedLayers - mdpBatchSize;
            break;
        }
    }

    ALOGD_IF(isDebug(), "%s:Before optimizing fbBatch, mdpbatch %d, fbbatch %d "
            "dropped %d", __FUNCTION__, mdpBatchSize, fbBatchSize,
            mCurrentFrame.dropCount);

    //Start at a point where the fb batch should at least have 2 layers, for
    //this mode to be justified.
    while(fbBatchSize < 2) {
        ++fbBatchSize;
        --mdpBatchSize;
    }

    //If there are no layers for MDP, this mode doesnt make sense.
    if(mdpBatchSize < 1) {
        ALOGD_IF(isDebug(), "%s: No MDP layers after optimizing for fbBatch",
                __FUNCTION__);
        return false;
    }

    mCurrentFrame.reset(numAppLayers);

    //Try with successively smaller mdp batch sizes until we succeed or reach 1
    while(mdpBatchSize > 0) {
        //Mark layers for MDP comp
        int mdpBatchLeft = mdpBatchSize;
        for(int i = 0; i < lastMDPSupportedIndex and mdpBatchLeft; i++) {
            if(mCurrentFrame.drop[i]) {
                continue;
            }
            mCurrentFrame.isFBComposed[i] = false;
            --mdpBatchLeft;
        }

        mCurrentFrame.fbZ = mdpBatchSize;
        mCurrentFrame.fbCount = fbBatchSize;
        mCurrentFrame.mdpCount = mdpBatchSize;

        ALOGD_IF(isDebug(), "%s:Trying with: mdpbatch %d fbbatch %d dropped %d",
                __FUNCTION__, mdpBatchSize, fbBatchSize,
                mCurrentFrame.dropCount);

        if(postHeuristicsHandling(ctx, list)) {
            ALOGD_IF(isDebug(), "%s: Postheuristics handling succeeded",
                     __FUNCTION__);
            ALOGD_IF(sSimulationFlags,"%s: LOAD_MDP_COMP SUCCEEDED",
                     __FUNCTION__);
            return true;
        }

        reset(ctx);
        --mdpBatchSize;
        ++fbBatchSize;
    }

    return false;
}

bool MDPComp::isLoadBasedCompDoable(hwc_context_t *ctx) {
    if(mDpy or isSecurePresent(ctx, mDpy) or
            isYuvPresent(ctx, mDpy)) {
        return false;
    }
    return true;
}

bool MDPComp::canPartialUpdate(hwc_context_t *ctx,
        hwc_display_contents_1_t* list){
    if(!qdutils::MDPVersion::getInstance().isPartialUpdateEnabled() ||
            isSkipPresent(ctx, mDpy) || (list->flags & HWC_GEOMETRY_CHANGED) ||
            !sIsPartialUpdateActive || mDpy ) {
        return false;
    }
    if(ctx->listStats[mDpy].secureUI)
        return false;
    return true;
}

bool MDPComp::tryVideoOnly(hwc_context_t *ctx,
        hwc_display_contents_1_t* list) {
    const bool secureOnly = true;
    return videoOnlyComp(ctx, list, not secureOnly) or
            videoOnlyComp(ctx, list, secureOnly);
}

bool MDPComp::videoOnlyComp(hwc_context_t *ctx,
        hwc_display_contents_1_t* list, bool secureOnly) {
    if(sSimulationFlags & MDPCOMP_AVOID_VIDEO_ONLY)
        return false;

    int numAppLayers = ctx->listStats[mDpy].numAppLayers;
    if(!isSecurePresent(ctx, mDpy)) {
       /* Bail out if we are processing only secured video layers
        * and we dont have any */
       if(secureOnly) {
           ALOGD_IF(isDebug(),"%s: No Secure Video Layers", __FUNCTION__);
           return false;
       }
       /* No Idle fall back for secure video layers and if there is only
        * single layer being composed. */
       if(sIdleFallBack && (ctx->listStats[mDpy].numAppLayers > 1)) {
           ALOGD_IF(isDebug(), "%s: Idle fallback dpy %d",__FUNCTION__, mDpy);
           return false;
        }
    }

    mCurrentFrame.reset(numAppLayers);
    mCurrentFrame.fbCount -= mCurrentFrame.dropCount;
    updateYUV(ctx, list, secureOnly, mCurrentFrame);
    int mdpCount = mCurrentFrame.mdpCount;

    if(!isYuvPresent(ctx, mDpy) or (mdpCount == 0)) {
        reset(ctx);
        return false;
    }

    if(mCurrentFrame.fbCount)
        mCurrentFrame.fbZ = mCurrentFrame.mdpCount;

    if(sEnableYUVsplit || needs3DComposition(ctx, mDpy)){
        adjustForSourceSplit(ctx, list);
    }

    if(!postHeuristicsHandling(ctx, list)) {
        ALOGD_IF(isDebug(), "post heuristic handling failed");
        if(errno == ENOBUFS) {
            ALOGD_IF(isDebug(), "SMP Allocation failed");
            //On SMP allocation failure in video only comp add padding round
            ctx->isPaddingRound = true;
        }
        reset(ctx);
        return false;
    }

    ALOGD_IF(sSimulationFlags,"%s: VIDEO_ONLY_COMP SUCCEEDED",
             __FUNCTION__);
    return true;
}

/* if tryFullFrame fails, try to push all video and secure RGB layers to MDP */
bool MDPComp::tryMDPOnlyLayers(hwc_context_t *ctx,
        hwc_display_contents_1_t* list) {
    // Fall back to video only composition, if AIV video mode is enabled
    if(ctx->listStats[mDpy].mAIVVideoMode) {
        ALOGD_IF(isDebug(), "%s: AIV Video Mode enabled dpy %d",
            __FUNCTION__, mDpy);
        return false;
    }

    // No MDP composition for 3D
    if(needs3DComposition(ctx,mDpy))
        return false;

    const bool secureOnly = true;
    return mdpOnlyLayersComp(ctx, list, not secureOnly) or
            mdpOnlyLayersComp(ctx, list, secureOnly);

}

bool MDPComp::mdpOnlyLayersComp(hwc_context_t *ctx,
        hwc_display_contents_1_t* list, bool secureOnly) {

    if(sSimulationFlags & MDPCOMP_AVOID_MDP_ONLY_LAYERS)
        return false;

    int numAppLayers = ctx->listStats[mDpy].numAppLayers;
    if(!isSecurePresent(ctx, mDpy) && !ctx->listStats[mDpy].secureUI) {
        /* Bail out if we are processing only secured video/ui layers
         * and we dont have any */
        if(secureOnly) {
            ALOGD_IF(isDebug(), "%s: No secure video/ui layers");
            return false;
        }
        /* No Idle fall back for secure video/ui layers and if there is only
         * single layer being composed. */
        if(sIdleFallBack && (ctx->listStats[mDpy].numAppLayers > 1)) {
           ALOGD_IF(isDebug(), "%s: Idle fallback dpy %d",__FUNCTION__, mDpy);
           return false;
       }
    }

    /* Bail out if we dont have any secure RGB layers */
    if (!ctx->listStats[mDpy].secureRGBCount) {
        reset(ctx);
        return false;
    }

    mCurrentFrame.reset(numAppLayers);
    mCurrentFrame.fbCount -= mCurrentFrame.dropCount;

    updateYUV(ctx, list, secureOnly, mCurrentFrame);
    /* mark secure RGB layers for MDP comp */
    updateSecureRGB(ctx, list);

    if(mCurrentFrame.mdpCount == 0) {
        reset(ctx);
        return false;
    }

    /* find the maximum batch of layers to be marked for framebuffer */
    bool ret = markLayersForCaching(ctx, list); //sets up fbZ also
    if(!ret) {
        ALOGD_IF(isDebug(),"%s: batching failed, dpy %d",__FUNCTION__, mDpy);
        reset(ctx);
        return false;
    }

    if(sEnableYUVsplit){
        adjustForSourceSplit(ctx, list);
    }

    if(!postHeuristicsHandling(ctx, list)) {
        ALOGD_IF(isDebug(), "post heuristic handling failed");
        reset(ctx);
        return false;
    }

    ALOGD_IF(sSimulationFlags,"%s: MDP_ONLY_LAYERS_COMP SUCCEEDED",
             __FUNCTION__);
    return true;
}

/* Checks for conditions where YUV layers cannot be bypassed */
bool MDPComp::isYUVDoable(hwc_context_t* ctx, hwc_layer_1_t* layer) {
    if(isSkipLayer(layer)) {
        ALOGD_IF(isDebug(), "%s: Video marked SKIP dpy %d", __FUNCTION__, mDpy);
        return false;
    }

    if(has90Transform(layer) && !canUseRotator(ctx, mDpy)) {
        ALOGD_IF(isDebug(), "%s: no free DMA pipe",__FUNCTION__);
        return false;
    }

    if(isSecuring(ctx, layer)) {
        ALOGD_IF(isDebug(), "%s: MDP securing is active", __FUNCTION__);
        return false;
    }

    if(!isValidDimension(ctx, layer)) {
        ALOGD_IF(isDebug(), "%s: Buffer is of invalid width",
            __FUNCTION__);
        return false;
    }

    if(layer->planeAlpha < 0xFF) {
        ALOGD_IF(isDebug(), "%s: Cannot handle YUV layer with plane alpha\
                 in video only mode",
                 __FUNCTION__);
        return false;
    }

    return true;
}

/* Checks for conditions where Secure RGB layers cannot be bypassed */
bool MDPComp::isSecureRGBDoable(hwc_context_t* ctx, hwc_layer_1_t* layer) {
    if(isSkipLayer(layer)) {
        ALOGD_IF(isDebug(), "%s: Secure RGB layer marked SKIP dpy %d",
            __FUNCTION__, mDpy);
        return false;
    }

    if(isSecuring(ctx, layer)) {
        ALOGD_IF(isDebug(), "%s: MDP securing is active", __FUNCTION__);
        return false;
    }

    if(not isSupportedForMDPComp(ctx, layer)) {
        ALOGD_IF(isDebug(), "%s: Unsupported secure RGB layer",
            __FUNCTION__);
        return false;
    }
    return true;
}

/* starts at fromIndex and check for each layer to find
 * if it it has overlapping with any Updating layer above it in zorder
 * till the end of the batch. returns true if it finds any intersection */
bool MDPComp::canPushBatchToTop(const hwc_display_contents_1_t* list,
        int fromIndex, int toIndex) {
    for(int i = fromIndex; i < toIndex; i++) {
        if(mCurrentFrame.isFBComposed[i] && !mCurrentFrame.drop[i]) {
            if(intersectingUpdatingLayers(list, i+1, toIndex, i)) {
                return false;
            }
        }
    }
    return true;
}

/* Checks if given layer at targetLayerIndex has any
 * intersection with all the updating layers in beween
 * fromIndex and toIndex. Returns true if it finds intersectiion */
bool MDPComp::intersectingUpdatingLayers(const hwc_display_contents_1_t* list,
        int fromIndex, int toIndex, int targetLayerIndex) {
    for(int i = fromIndex; i <= toIndex; i++) {
        if(!mCurrentFrame.isFBComposed[i]) {
            if(areLayersIntersecting(&list->hwLayers[i],
                        &list->hwLayers[targetLayerIndex]))  {
                return true;
            }
        }
    }
    return false;
}

int MDPComp::getBatch(hwc_display_contents_1_t* list,
        int& maxBatchStart, int& maxBatchEnd,
        int& maxBatchCount) {
    int i = 0;
    int fbZOrder =-1;
    int droppedLayerCt = 0;
    while (i < mCurrentFrame.layerCount) {
        int batchCount = 0;
        int batchStart = i;
        int batchEnd = i;
        /* Adjust batch Z order with the dropped layers so far */
        int fbZ = batchStart - droppedLayerCt;
        int firstZReverseIndex = -1;
        int updatingLayersAbove = 0;//Updating layer count in middle of batch
        while(i < mCurrentFrame.layerCount) {
            if(!mCurrentFrame.isFBComposed[i]) {
                if(!batchCount) {
                    i++;
                    break;
                }
                updatingLayersAbove++;
                i++;
                continue;
            } else {
                if(mCurrentFrame.drop[i]) {
                    i++;
                    droppedLayerCt++;
                    continue;
                } else if(updatingLayersAbove <= 0) {
                    batchCount++;
                    batchEnd = i;
                    i++;
                    continue;
                } else { //Layer is FBComposed, not a drop & updatingLayer > 0

                    // We have a valid updating layer already. If layer-i not
                    // have overlapping with all updating layers in between
                    // batch-start and i, then we can add layer i to batch.
                    if(!intersectingUpdatingLayers(list, batchStart, i-1, i)) {
                        batchCount++;
                        batchEnd = i;
                        i++;
                        continue;
                    } else if(canPushBatchToTop(list, batchStart, i)) {
                        //If All the non-updating layers with in this batch
                        //does not have intersection with the updating layers
                        //above in z-order, then we can safely move the batch to
                        //higher z-order. Increment fbZ as it is moving up.
                        if( firstZReverseIndex < 0) {
                            firstZReverseIndex = i;
                        }
                        batchCount++;
                        batchEnd = i;
                        fbZ += updatingLayersAbove;
                        i++;
                        updatingLayersAbove = 0;
                        continue;
                    } else {
                        //both failed.start the loop again from here.
                        if(firstZReverseIndex >= 0) {
                            i = firstZReverseIndex;
                        }
                        break;
                    }
                }
            }
        }
        if(batchCount > maxBatchCount) {
            maxBatchCount = batchCount;
            maxBatchStart = batchStart;
            maxBatchEnd = batchEnd;
            fbZOrder = fbZ;
        }
    }
    return fbZOrder;
}

bool  MDPComp::markLayersForCaching(hwc_context_t* ctx,
        hwc_display_contents_1_t* list) {
    /* Idea is to keep as many non-updating(cached) layers in FB and
     * send rest of them through MDP. This is done in 2 steps.
     *   1. Find the maximum contiguous batch of non-updating layers.
     *   2. See if we can improve this batch size for caching by adding
     *      opaque layers around the batch, if they don't have
     *      any overlapping with the updating layers in between.
     * NEVER mark an updating layer for caching.
     * But cached ones can be marked for MDP */

    int maxBatchStart = -1;
    int maxBatchEnd = -1;
    int maxBatchCount = 0;
    int fbZ = -1;

    /* Nothing is cached. No batching needed */
    if(mCurrentFrame.fbCount == 0) {
        return true;
    }

    /* No MDP comp layers, try to use other comp modes */
    if(mCurrentFrame.mdpCount == 0) {
        return false;
    }

    fbZ = getBatch(list, maxBatchStart, maxBatchEnd, maxBatchCount);

    /* reset rest of the layers lying inside ROI for MDP comp */
    for(int i = 0; i < mCurrentFrame.layerCount; i++) {
        hwc_layer_1_t* layer = &list->hwLayers[i];
        if((i < maxBatchStart || i > maxBatchEnd) &&
                mCurrentFrame.isFBComposed[i]){
            if(!mCurrentFrame.drop[i]){
                //If an unsupported layer is being attempted to
                //be pulled out we should fail
                if(not isSupportedForMDPComp(ctx, layer)) {
                    return false;
                }
                mCurrentFrame.isFBComposed[i] = false;
            }
        }
    }

    // update the frame data
    mCurrentFrame.fbZ = fbZ;
    mCurrentFrame.fbCount = maxBatchCount;
    mCurrentFrame.mdpCount = mCurrentFrame.layerCount -
            mCurrentFrame.fbCount - mCurrentFrame.dropCount;

    ALOGD_IF(isDebug(),"%s: cached count: %d",__FUNCTION__,
            mCurrentFrame.fbCount);

    return true;
}

void MDPComp::updateLayerCache(hwc_context_t* ctx,
        hwc_display_contents_1_t* list, FrameInfo& frame) {
    int numAppLayers = ctx->listStats[mDpy].numAppLayers;
    int fbCount = 0;

    for(int i = 0; i < numAppLayers; i++) {
        if (mCachedFrame.hnd[i] == list->hwLayers[i].handle) {
            if(!frame.drop[i])
                fbCount++;
            frame.isFBComposed[i] = true;
        } else {
            frame.isFBComposed[i] = false;
        }
    }

    frame.fbCount = fbCount;
    frame.mdpCount = frame.layerCount - frame.fbCount
                                            - frame.dropCount;

    ALOGD_IF(isDebug(),"%s: MDP count: %d FB count %d drop count: %d",
            __FUNCTION__, frame.mdpCount, frame.fbCount, frame.dropCount);
}

// drop other non-AIV layers from external display list.
void MDPComp::dropNonAIVLayers(hwc_context_t* ctx,
                              hwc_display_contents_1_t* list) {
    for (size_t i = 0; i < (size_t)ctx->listStats[mDpy].numAppLayers; i++) {
        hwc_layer_1_t * layer = &list->hwLayers[i];
         if(!(isAIVVideoLayer(layer) || isAIVCCLayer(layer))) {
            mCurrentFrame.dropCount++;
            mCurrentFrame.drop[i] = true;
        }
    }
    mCurrentFrame.fbCount -= mCurrentFrame.dropCount;
    mCurrentFrame.mdpCount = mCurrentFrame.layerCount -
            mCurrentFrame.fbCount - mCurrentFrame.dropCount;
    ALOGD_IF(isDebug(),"%s: fb count: %d mdp count %d drop count %d",
        __FUNCTION__, mCurrentFrame.fbCount, mCurrentFrame.mdpCount,
        mCurrentFrame.dropCount);
}

void MDPComp::updateYUV(hwc_context_t* ctx, hwc_display_contents_1_t* list,
        bool secureOnly, FrameInfo& frame) {
    int nYuvCount = ctx->listStats[mDpy].yuvCount;
    for(int index = 0;index < nYuvCount; index++){
        int nYuvIndex = ctx->listStats[mDpy].yuvIndices[index];
        hwc_layer_1_t* layer = &list->hwLayers[nYuvIndex];

        if(mCurrentFrame.drop[nYuvIndex]) {
            continue;
        }

        if(!isYUVDoable(ctx, layer)) {
            if(!frame.isFBComposed[nYuvIndex]) {
                frame.isFBComposed[nYuvIndex] = true;
                frame.fbCount++;
            }
        } else {
            if(frame.isFBComposed[nYuvIndex]) {
                private_handle_t *hnd = (private_handle_t *)layer->handle;
                if(!secureOnly || isSecureBuffer(hnd)) {
                    frame.isFBComposed[nYuvIndex] = false;
                    frame.fbCount--;
                }
            }
        }
    }

    frame.mdpCount = frame.layerCount - frame.fbCount - frame.dropCount;
    ALOGD_IF(isDebug(),"%s: fb count: %d",__FUNCTION__, frame.fbCount);
}

void MDPComp::updateSecureRGB(hwc_context_t* ctx,
    hwc_display_contents_1_t* list) {
    int nSecureRGBCount = ctx->listStats[mDpy].secureRGBCount;
    for(int index = 0;index < nSecureRGBCount; index++){
        int nSecureRGBIndex = ctx->listStats[mDpy].secureRGBIndices[index];
        hwc_layer_1_t* layer = &list->hwLayers[nSecureRGBIndex];

        if(!isSecureRGBDoable(ctx, layer)) {
            if(!mCurrentFrame.isFBComposed[nSecureRGBIndex]) {
                mCurrentFrame.isFBComposed[nSecureRGBIndex] = true;
                mCurrentFrame.fbCount++;
            }
        } else {
            if(mCurrentFrame.isFBComposed[nSecureRGBIndex]) {
                mCurrentFrame.isFBComposed[nSecureRGBIndex] = false;
                mCurrentFrame.fbCount--;
            }
        }
    }

    mCurrentFrame.mdpCount = mCurrentFrame.layerCount -
            mCurrentFrame.fbCount - mCurrentFrame.dropCount;
    ALOGD_IF(isDebug(),"%s: fb count: %d",__FUNCTION__,
             mCurrentFrame.fbCount);
}

hwc_rect_t MDPComp::getUpdatingFBRect(hwc_context_t *ctx,
        hwc_display_contents_1_t* list){
    hwc_rect_t fbRect = (struct hwc_rect){0, 0, 0, 0};

    /* Update only the region of FB needed for composition */
    for(int i = 0; i < mCurrentFrame.layerCount; i++ ) {
        if(mCurrentFrame.isFBComposed[i] && !mCurrentFrame.drop[i]) {
            hwc_layer_1_t* layer = &list->hwLayers[i];
            hwc_rect_t dst = layer->displayFrame;
            fbRect = getUnion(fbRect, dst);
        }
    }
    trimAgainstROI(ctx, fbRect, fbRect);
    return fbRect;
}

bool MDPComp::postHeuristicsHandling(hwc_context_t *ctx,
        hwc_display_contents_1_t* list) {

    //Capability checks
    if(!resourceCheck(ctx, list)) {
        ALOGD_IF(isDebug(), "%s: resource check failed", __FUNCTION__);
        return false;
    }

    //Limitations checks
    if(!hwLimitationsCheck(ctx, list)) {
        ALOGD_IF(isDebug(), "%s: HW limitations",__FUNCTION__);
        return false;
    }

    //Configure framebuffer first if applicable
    if(mCurrentFrame.fbZ >= 0) {
        hwc_rect_t fbRect = getUpdatingFBRect(ctx, list);
        if(!ctx->mFBUpdate[mDpy]->prepare(ctx, list, fbRect, mCurrentFrame.fbZ))
        {
            ALOGD_IF(isDebug(), "%s configure framebuffer failed",
                    __FUNCTION__);
            return false;
        }
    }

    mCurrentFrame.map();

    if(!allocLayerPipes(ctx, list)) {
        ALOGD_IF(isDebug(), "%s: Unable to allocate MDP pipes", __FUNCTION__);
        return false;
    }

    for (int index = 0, mdpNextZOrder = 0; index < mCurrentFrame.layerCount;
            index++) {
        if(!mCurrentFrame.isFBComposed[index]) {
            int mdpIndex = mCurrentFrame.layerToMDP[index];
            hwc_layer_1_t* layer = &list->hwLayers[index];

            //Leave fbZ for framebuffer. CACHE/GLES layers go here.
            if(mdpNextZOrder == mCurrentFrame.fbZ) {
                mdpNextZOrder++;
            }
            MdpPipeInfo* cur_pipe = mCurrentFrame.mdpToLayer[mdpIndex].pipeInfo;
            cur_pipe->zOrder = mdpNextZOrder++;

            private_handle_t *hnd = (private_handle_t *)layer->handle;
            if(isYUVSplitNeeded(hnd) && sEnableYUVsplit){
                if(configure4k2kYuv(ctx, layer,
                            mCurrentFrame.mdpToLayer[mdpIndex])
                        != 0 ){
                    ALOGD_IF(isDebug(), "%s: Failed to configure split pipes \
                            for layer %d",__FUNCTION__, index);
                    return false;
                }
                else{
                    mdpNextZOrder++;
                }
                continue;
            }
            if(needs3DComposition(ctx,mDpy) && get3DFormat(hnd) != HAL_NO_3D) {
                mdpNextZOrder++;
            }
            if(configure(ctx, layer, mCurrentFrame.mdpToLayer[mdpIndex]) != 0 ){
                ALOGD_IF(isDebug(), "%s: Failed to configure overlay for \
                        layer %d",__FUNCTION__, index);
                return false;
            }
        }
    }

    if(!ctx->mOverlay->validateAndSet(mDpy, ctx->dpyAttr[mDpy].fd)) {
        ALOGD_IF(isDebug(), "%s: Failed to validate and set overlay for dpy %d"
                ,__FUNCTION__, mDpy);
        return false;
    }

    setRedraw(ctx, list);
    return true;
}

bool MDPComp::resourceCheck(hwc_context_t* ctx,
        hwc_display_contents_1_t* list) {
    const bool fbUsed = mCurrentFrame.fbCount;
    if(mCurrentFrame.mdpCount > sMaxPipesPerMixer - fbUsed) {
        ALOGD_IF(isDebug(), "%s: Exceeds MAX_PIPES_PER_MIXER",__FUNCTION__);
        return false;
    }

    //Will benefit cases where a video has non-updating background.
    if((mDpy > HWC_DISPLAY_PRIMARY) and
            (mCurrentFrame.mdpCount > sMaxSecLayers)) {
        ALOGD_IF(isDebug(), "%s: Exceeds max secondary pipes",__FUNCTION__);
        return false;
    }

    // Init rotCount to number of rotate sessions used by other displays
    int rotCount = ctx->mRotMgr->getNumActiveSessions();
    // Count the number of rotator sessions required for current display
    for (int index = 0; index < mCurrentFrame.layerCount; index++) {
        if(!mCurrentFrame.isFBComposed[index]) {
            hwc_layer_1_t* layer = &list->hwLayers[index];
            private_handle_t *hnd = (private_handle_t *)layer->handle;
            if(has90Transform(layer) && isRotationDoable(ctx, hnd)) {
                rotCount++;
            }
        }
    }
    // if number of layers to rotate exceeds max rotator sessions, bail out.
    if(rotCount > RotMgr::MAX_ROT_SESS) {
        ALOGD_IF(isDebug(), "%s: Exceeds max rotator sessions  %d",
                                    __FUNCTION__, mDpy);
        return false;
    }
    return true;
}

bool MDPComp::hwLimitationsCheck(hwc_context_t* ctx,
        hwc_display_contents_1_t* list) {

    //A-family hw limitation:
    //If a layer need alpha scaling, MDP can not support.
    if(ctx->mMDP.version < qdutils::MDSS_V5) {
        for(int i = 0; i < mCurrentFrame.layerCount; ++i) {
            if(!mCurrentFrame.isFBComposed[i] &&
                    isAlphaScaled( &list->hwLayers[i])) {
                ALOGD_IF(isDebug(), "%s:frame needs alphaScaling",__FUNCTION__);
                return false;
            }
        }
    }

    // On 8x26 & 8974 hw, we have a limitation of downscaling+blending.
    //If multiple layers requires downscaling and also they are overlapping
    //fall back to GPU since MDSS can not handle it.
    if(qdutils::MDPVersion::getInstance().is8x74v2() ||
            qdutils::MDPVersion::getInstance().is8x26()) {
        for(int i = 0; i < mCurrentFrame.layerCount-1; ++i) {
            hwc_layer_1_t* botLayer = &list->hwLayers[i];
            if(!mCurrentFrame.isFBComposed[i] &&
                    isDownscaleRequired(botLayer)) {
                //if layer-i is marked for MDP and needs downscaling
                //check if any MDP layer on top of i & overlaps with layer-i
                for(int j = i+1; j < mCurrentFrame.layerCount; ++j) {
                    hwc_layer_1_t* topLayer = &list->hwLayers[j];
                    if(!mCurrentFrame.isFBComposed[j] &&
                            isDownscaleRequired(topLayer)) {
                        hwc_rect_t r = getIntersection(botLayer->displayFrame,
                                topLayer->displayFrame);
                        if(isValidRect(r))
                            return false;
                    }
                }
            }
        }
    }
    return true;
}

// Checks only if videos or single layer(RGB) is updating
// which is used for setting dynamic fps or perf hint for single
// layer video playback
bool MDPComp::onlyVideosUpdating(hwc_context_t *ctx,
                                hwc_display_contents_1_t* list) {
    bool support = false;
    FrameInfo frame;
    frame.reset(mCurrentFrame.layerCount);
    memset(&frame.drop, 0, sizeof(frame.drop));
    frame.dropCount = 0;
    ALOGD_IF(isDebug(), "%s: Update Cache and YUVInfo", __FUNCTION__);
    updateLayerCache(ctx, list, frame);
    updateYUV(ctx, list, false /*secure only*/, frame);
    // There are only updating YUV layers or there is single RGB
    // Layer(Youtube)
    if((ctx->listStats[mDpy].yuvCount == frame.mdpCount) ||
                                        (frame.layerCount == 1)) {
        support = true;
    }
    return support;
}

void MDPComp::setDynRefreshRate(hwc_context_t *ctx, hwc_display_contents_1_t* list) {
    //For primary display, set the dynamic refreshrate
    if(!mDpy && qdutils::MDPVersion::getInstance().isDynFpsSupported() &&
                                        ctx->mUseMetaDataRefreshRate) {
        uint32_t refreshRate = ctx->dpyAttr[mDpy].refreshRate;
        MDPVersion& mdpHw = MDPVersion::getInstance();
        if(sIdleFallBack) {
            //Set minimum panel refresh rate during idle timeout
            refreshRate = mdpHw.getMinFpsSupported();
        } else if(onlyVideosUpdating(ctx, list)) {
            //Set the new fresh rate, if there is only one updating YUV layer
            //or there is one single RGB layer with this request
            refreshRate = ctx->listStats[mDpy].refreshRateRequest;
        }
        setRefreshRate(ctx, mDpy, refreshRate);
    }
}

int MDPComp::prepare(hwc_context_t *ctx, hwc_display_contents_1_t* list) {
    int ret = 0;
    char property[PROPERTY_VALUE_MAX];

    if(!ctx || !list) {
        ALOGE("%s: Invalid context or list",__FUNCTION__);
        mCachedFrame.reset();
        return -1;
    }

    const int numLayers = ctx->listStats[mDpy].numAppLayers;
    if(mDpy == HWC_DISPLAY_PRIMARY) {
        sSimulationFlags = 0;
        if(property_get("debug.hwc.simulate", property, NULL) > 0) {
            int currentFlags = atoi(property);
            if(currentFlags != sSimulationFlags) {
                sSimulationFlags = currentFlags;
                ALOGI("%s: Simulation Flag read: 0x%x (%d)", __FUNCTION__,
                        sSimulationFlags, sSimulationFlags);
            }
        }
    }
    // reset PTOR
    if(!mDpy)
        memset(&(ctx->mPtorInfo), 0, sizeof(ctx->mPtorInfo));

    //reset old data
    mCurrentFrame.reset(numLayers);
    memset(&mCurrentFrame.drop, 0, sizeof(mCurrentFrame.drop));
    mCurrentFrame.dropCount = 0;

    //Do not cache the information for next draw cycle.
    if(numLayers > MAX_NUM_APP_LAYERS or (!numLayers)) {
        ALOGI("%s: Unsupported layer count for mdp composition",
                __FUNCTION__);
        mCachedFrame.reset();
#ifdef DYNAMIC_FPS
        setDynRefreshRate(ctx, list);
#endif
        return -1;
    }

    // Detect the start of animation and fall back to GPU only once to cache
    // all the layers in FB and display FB content untill animation completes.
    if(ctx->listStats[mDpy].isDisplayAnimating) {
        mCurrentFrame.needsRedraw = false;
        if(ctx->mAnimationState[mDpy] == ANIMATION_STOPPED) {
            mCurrentFrame.needsRedraw = true;
            ctx->mAnimationState[mDpy] = ANIMATION_STARTED;
        }
        setMDPCompLayerFlags(ctx, list);
        mCachedFrame.updateCounts(mCurrentFrame);
#ifdef DYNAMIC_FPS
        setDynRefreshRate(ctx, list);
#endif
        ret = -1;
        return ret;
    } else {
        ctx->mAnimationState[mDpy] = ANIMATION_STOPPED;
    }

    if(!mDpy and !isSecondaryConnected(ctx) and !mPrevModeOn and
       mCachedFrame.isSameFrame(ctx,mDpy,list)) {

        ALOGD_IF(isDebug(),"%s: Avoid new composition",__FUNCTION__);
        mCurrentFrame.needsRedraw = false;
        setMDPCompLayerFlags(ctx, list);
        mCachedFrame.updateCounts(mCurrentFrame);
#ifdef DYNAMIC_FPS
        setDynRefreshRate(ctx, list);
#endif
        return -1;

    }

    //Hard conditions, if not met, cannot do MDP comp
    if(isFrameDoable(ctx)) {
        generateROI(ctx, list);
        // if AIV Video mode is enabled, drop all non AIV layers from the
        // external display list.
        if(ctx->listStats[mDpy].mAIVVideoMode) {
            dropNonAIVLayers(ctx, list);
        }

        // if tryFullFrame fails, try to push all video and secure RGB layers
        // to MDP for composition.
        mModeOn = tryFullFrame(ctx, list) || tryMDPOnlyLayers(ctx, list) ||
                  tryVideoOnly(ctx, list);
        if(mModeOn) {
            setMDPCompLayerFlags(ctx, list);
        } else {
            resetROI(ctx, mDpy);
            reset(ctx);
            memset(&mCurrentFrame.drop, 0, sizeof(mCurrentFrame.drop));
            mCurrentFrame.dropCount = 0;
            ret = -1;
            ALOGE_IF(sSimulationFlags && (mDpy == HWC_DISPLAY_PRIMARY),
                    "MDP Composition Strategies Failed");
        }
    } else {
        if ((ctx->mMDP.version == qdutils::MDP_V3_0_5) && ctx->mCopyBit[mDpy] &&
                enablePartialUpdateForMDP3) {
            generateROI(ctx, list);
            for(int i = 0; i < ctx->listStats[mDpy].numAppLayers; i++) {
                ctx->copybitDrop[i] = mCurrentFrame.drop[i];
            }
        }
        ALOGD_IF( isDebug(),"%s: MDP Comp not possible for this frame",
                __FUNCTION__);
        ret = -1;
    }

    if(isDebug()) {
        ALOGD("GEOMETRY change: %d",
                (list->flags & HWC_GEOMETRY_CHANGED));
        android::String8 sDump("");
        dump(sDump, ctx);
        ALOGD("%s",sDump.string());
    }

#ifdef DYNAMIC_FPS
    setDynRefreshRate(ctx, list);
#endif
    setPerfHint(ctx, list);

    mCachedFrame.cacheAll(list);
    mCachedFrame.updateCounts(mCurrentFrame);
    return ret;
}

bool MDPComp::allocSplitVGPipes(hwc_context_t *ctx, int index) {

    bool bRet = true;
    int mdpIndex = mCurrentFrame.layerToMDP[index];
    PipeLayerPair& info = mCurrentFrame.mdpToLayer[mdpIndex];
    info.pipeInfo = new MdpYUVPipeInfo;
    info.rot = NULL;
    MdpYUVPipeInfo& pipe_info = *(MdpYUVPipeInfo*)info.pipeInfo;

    pipe_info.lIndex = ovutils::OV_INVALID;
    pipe_info.rIndex = ovutils::OV_INVALID;

    Overlay::PipeSpecs pipeSpecs;
    pipeSpecs.formatClass = Overlay::FORMAT_YUV;
    pipeSpecs.needsScaling = true;
    pipeSpecs.dpy = mDpy;
    pipeSpecs.fb = false;

    pipe_info.lIndex = ctx->mOverlay->getPipe(pipeSpecs);
    if(pipe_info.lIndex == ovutils::OV_INVALID){
        bRet = false;
        ALOGD_IF(isDebug(),"%s: allocating first VG pipe failed",
                __FUNCTION__);
    }
    pipe_info.rIndex = ctx->mOverlay->getPipe(pipeSpecs);
    if(pipe_info.rIndex == ovutils::OV_INVALID){
        bRet = false;
        ALOGD_IF(isDebug(),"%s: allocating second VG pipe failed",
                __FUNCTION__);
    }
    return bRet;
}

int MDPComp::drawOverlap(hwc_context_t *ctx, hwc_display_contents_1_t* list) {
    int fd = -1;
    if (ctx->mPtorInfo.isActive()) {
        fd = ctx->mCopyBit[mDpy]->drawOverlap(ctx, list);
        if (fd < 0) {
            ALOGD_IF(isDebug(),"%s: failed", __FUNCTION__);
        }
    }
    return fd;
}
//=============MDPCompNonSplit==================================================

void MDPCompNonSplit::adjustForSourceSplit(hwc_context_t *ctx,
        hwc_display_contents_1_t* list) {
    //If 4k2k Yuv layer split is possible,  and if
    //fbz is above 4k2k layer, increment fb zorder by 1
    //as we split 4k2k layer and increment zorder for right half
    //of the layer
    if(!ctx)
        return;
    if(mCurrentFrame.fbZ >= 0) {
        for (int index = 0, mdpNextZOrder = 0; index < mCurrentFrame.layerCount;
                index++) {
            if(!mCurrentFrame.isFBComposed[index]) {
                if(mdpNextZOrder == mCurrentFrame.fbZ) {
                    mdpNextZOrder++;
                }
                mdpNextZOrder++;
                hwc_layer_1_t* layer = &list->hwLayers[index];
                private_handle_t *hnd = (private_handle_t *)layer->handle;
                if(isYUVSplitNeeded(hnd)) {
                    if(mdpNextZOrder <= mCurrentFrame.fbZ)
                        mCurrentFrame.fbZ += 1;
                    mdpNextZOrder++;
                    //As we split 4kx2k yuv layer and program to 2 VG pipes
                    //(if available) increase mdpcount by 1.
                    mCurrentFrame.mdpCount++;
                }
            }
        }
    }
}

/*
 * Configures pipe(s) for MDP composition
 */
int MDPCompNonSplit::configure(hwc_context_t *ctx, hwc_layer_1_t *layer,
                             PipeLayerPair& PipeLayerPair) {
    MdpPipeInfoNonSplit& mdp_info =
        *(static_cast<MdpPipeInfoNonSplit*>(PipeLayerPair.pipeInfo));
    eMdpFlags mdpFlags = ovutils::OV_MDP_FLAGS_NONE;
    eZorder zOrder = static_cast<eZorder>(mdp_info.zOrder);
    eDest dest = mdp_info.index;

    ALOGD_IF(isDebug(),"%s: configuring: layer: %p z_order: %d dest_pipe: %d",
             __FUNCTION__, layer, zOrder, dest);

    return configureNonSplit(ctx, layer, mDpy, mdpFlags, zOrder, dest,
                           &PipeLayerPair.rot);
}

bool MDPCompNonSplit::allocLayerPipes(hwc_context_t *ctx,
        hwc_display_contents_1_t* list) {
    for(int index = 0; index < mCurrentFrame.layerCount; index++) {

        if(mCurrentFrame.isFBComposed[index]) continue;

        hwc_layer_1_t* layer = &list->hwLayers[index];
        private_handle_t *hnd = (private_handle_t *)layer->handle;
        if(isYUVSplitNeeded(hnd) && sEnableYUVsplit){
            if(allocSplitVGPipes(ctx, index)){
                continue;
            }
        }

        int mdpIndex = mCurrentFrame.layerToMDP[index];
        PipeLayerPair& info = mCurrentFrame.mdpToLayer[mdpIndex];
        info.pipeInfo = new MdpPipeInfoNonSplit;
        info.rot = NULL;
        MdpPipeInfoNonSplit& pipe_info = *(MdpPipeInfoNonSplit*)info.pipeInfo;

        Overlay::PipeSpecs pipeSpecs;
        pipeSpecs.formatClass = isYuvBuffer(hnd) ?
                Overlay::FORMAT_YUV : Overlay::FORMAT_RGB;
        pipeSpecs.needsScaling = qhwc::needsScaling(layer) or
                (qdutils::MDPVersion::getInstance().is8x26() and
                ctx->dpyAttr[HWC_DISPLAY_PRIMARY].xres > 1024);
        pipeSpecs.dpy = mDpy;
        pipeSpecs.fb = false;
        pipeSpecs.numActiveDisplays = ctx->numActiveDisplays;

        pipe_info.index = ctx->mOverlay->getPipe(pipeSpecs);

        if(pipe_info.index == ovutils::OV_INVALID) {
            ALOGD_IF(isDebug(), "%s: Unable to get pipe", __FUNCTION__);
            return false;
        }
    }
    return true;
}

int MDPCompNonSplit::configure4k2kYuv(hwc_context_t *ctx, hwc_layer_1_t *layer,
        PipeLayerPair& PipeLayerPair) {
    MdpYUVPipeInfo& mdp_info =
            *(static_cast<MdpYUVPipeInfo*>(PipeLayerPair.pipeInfo));
    eZorder zOrder = static_cast<eZorder>(mdp_info.zOrder);
    eMdpFlags mdpFlagsL = ovutils::OV_MDP_FLAGS_NONE;
    eDest lDest = mdp_info.lIndex;
    eDest rDest = mdp_info.rIndex;

    return configureSourceSplit(ctx, layer, mDpy, mdpFlagsL, zOrder,
            lDest, rDest, &PipeLayerPair.rot);
}

bool MDPCompNonSplit::draw(hwc_context_t *ctx, hwc_display_contents_1_t* list) {

    if(!isEnabled() or !mModeOn) {
        ALOGD_IF(isDebug(),"%s: MDP Comp not enabled/configured", __FUNCTION__);
        return true;
    }

    overlay::Overlay& ov = *ctx->mOverlay;
    LayerProp *layerProp = ctx->layerProp[mDpy];

    int numHwLayers = ctx->listStats[mDpy].numAppLayers;
    for(int i = 0; i < numHwLayers && mCurrentFrame.mdpCount; i++ )
    {
        if(mCurrentFrame.isFBComposed[i]) continue;

        hwc_layer_1_t *layer = &list->hwLayers[i];
        private_handle_t *hnd = (private_handle_t *)layer->handle;
        if(!hnd) {
            if (!(layer->flags & HWC_COLOR_FILL)) {
                ALOGE("%s handle null", __FUNCTION__);
                return false;
            }
            // No PLAY for Color layer
            layerProp[i].mFlags &= ~HWC_MDPCOMP;
            continue;
        }

        int mdpIndex = mCurrentFrame.layerToMDP[i];

        if(isYUVSplitNeeded(hnd) && sEnableYUVsplit)
        {
            MdpYUVPipeInfo& pipe_info =
                *(MdpYUVPipeInfo*)mCurrentFrame.mdpToLayer[mdpIndex].pipeInfo;
            Rotator *rot = mCurrentFrame.mdpToLayer[mdpIndex].rot;
            ovutils::eDest indexL = pipe_info.lIndex;
            ovutils::eDest indexR = pipe_info.rIndex;
            int fd = hnd->fd;
            uint32_t offset = (uint32_t)hnd->offset;
            if(rot) {
                rot->queueBuffer(fd, offset);
                fd = rot->getDstMemId();
                offset = rot->getDstOffset();
            }
            if(indexL != ovutils::OV_INVALID) {
                ovutils::eDest destL = (ovutils::eDest)indexL;
                ALOGD_IF(isDebug(),"%s: MDP Comp: Drawing layer: %p hnd: %p \
                        using  pipe: %d", __FUNCTION__, layer, hnd, indexL );
                if (!ov.queueBuffer(fd, offset, destL)) {
                    ALOGE("%s: queueBuffer failed for display:%d",
                            __FUNCTION__, mDpy);
                    return false;
                }
            }

            if(indexR != ovutils::OV_INVALID) {
                ovutils::eDest destR = (ovutils::eDest)indexR;
                ALOGD_IF(isDebug(),"%s: MDP Comp: Drawing layer: %p hnd: %p \
                        using  pipe: %d", __FUNCTION__, layer, hnd, indexR );
                if (!ov.queueBuffer(fd, offset, destR)) {
                    ALOGE("%s: queueBuffer failed for display:%d",
                            __FUNCTION__, mDpy);
                    return false;
                }
            }
        }
        else{
            MdpPipeInfoNonSplit& pipe_info =
            *(MdpPipeInfoNonSplit*)mCurrentFrame.mdpToLayer[mdpIndex].pipeInfo;
            ovutils::eDest dest = pipe_info.index;
            if(dest == ovutils::OV_INVALID) {
                ALOGE("%s: Invalid pipe index (%d)", __FUNCTION__, dest);
                return false;
            }

            if(!(layerProp[i].mFlags & HWC_MDPCOMP)) {
                continue;
            }

            int fd = hnd->fd;
            uint32_t offset = (uint32_t)hnd->offset;
            int index = ctx->mPtorInfo.getPTORArrayIndex(i);
            if (!mDpy && (index != -1)) {
                hnd = ctx->mCopyBit[mDpy]->getCurrentRenderBuffer();
                fd = hnd->fd;
                offset = 0;
            }

            ALOGD_IF(isDebug(),"%s: MDP Comp: Drawing layer: %p hnd: %p \
                    using  pipe: %d", __FUNCTION__, layer,
                    hnd, dest );

            Rotator *rot = mCurrentFrame.mdpToLayer[mdpIndex].rot;
            if(rot) {
                if(!rot->queueBuffer(fd, offset))
                    return false;
                fd = rot->getDstMemId();
                offset = rot->getDstOffset();
            }

            if (!ov.queueBuffer(fd, offset, dest)) {
                ALOGE("%s: queueBuffer failed for display:%d ",
                        __FUNCTION__, mDpy);
                return false;
            }
        }

        layerProp[i].mFlags &= ~HWC_MDPCOMP;
    }
    return true;
}

//=============MDPCompSplit===================================================

void MDPCompSplit::adjustForSourceSplit(hwc_context_t *ctx,
         hwc_display_contents_1_t* list){
    //if 4kx2k yuv layer is totally present in either in left half
    //or right half then try splitting the yuv layer to avoid decimation
    const int lSplit = getLeftSplit(ctx, mDpy);
    if(mCurrentFrame.fbZ >= 0) {
        for (int index = 0, mdpNextZOrder = 0; index < mCurrentFrame.layerCount;
                index++) {
            if(!mCurrentFrame.isFBComposed[index]) {
                if(mdpNextZOrder == mCurrentFrame.fbZ) {
                    mdpNextZOrder++;
                }
                mdpNextZOrder++;
                hwc_layer_1_t* layer = &list->hwLayers[index];
                private_handle_t *hnd = (private_handle_t *)layer->handle;
                if(isYUVSplitNeeded(hnd) ||
                        (needs3DComposition(ctx,mDpy) &&
                         get3DFormat(hnd) != HAL_NO_3D)) {
                    hwc_rect_t dst = layer->displayFrame;
                    if((dst.left > lSplit) || (dst.right < lSplit)) {
                        mCurrentFrame.mdpCount += 1;
                    }
                    if(mdpNextZOrder <= mCurrentFrame.fbZ)
                        mCurrentFrame.fbZ += 1;
                    mdpNextZOrder++;
                }
            }
        }
    }
}

bool MDPCompSplit::acquireMDPPipes(hwc_context_t *ctx, hwc_layer_1_t* layer,
        MdpPipeInfoSplit& pipe_info) {

    const int lSplit = getLeftSplit(ctx, mDpy);
    private_handle_t *hnd = (private_handle_t *)layer->handle;
    hwc_rect_t dst = layer->displayFrame;
    pipe_info.lIndex = ovutils::OV_INVALID;
    pipe_info.rIndex = ovutils::OV_INVALID;

    Overlay::PipeSpecs pipeSpecs;
    pipeSpecs.formatClass = isYuvBuffer(hnd) ?
            Overlay::FORMAT_YUV : Overlay::FORMAT_RGB;
    pipeSpecs.needsScaling = qhwc::needsScalingWithSplit(ctx, layer, mDpy);
    pipeSpecs.dpy = mDpy;
    pipeSpecs.mixer = Overlay::MIXER_LEFT;
    pipeSpecs.fb = false;

    // Acquire pipe only for the updating half
    hwc_rect_t l_roi = ctx->listStats[mDpy].lRoi;
    hwc_rect_t r_roi = ctx->listStats[mDpy].rRoi;

    if (dst.left < lSplit && isValidRect(getIntersection(dst, l_roi))) {
        pipe_info.lIndex = ctx->mOverlay->getPipe(pipeSpecs);
        if(pipe_info.lIndex == ovutils::OV_INVALID)
            return false;
    }

    if(dst.right > lSplit && isValidRect(getIntersection(dst, r_roi))) {
        pipeSpecs.mixer = Overlay::MIXER_RIGHT;
        pipe_info.rIndex = ctx->mOverlay->getPipe(pipeSpecs);
        if(pipe_info.rIndex == ovutils::OV_INVALID)
            return false;
    }

    return true;
}

bool MDPCompSplit::allocLayerPipes(hwc_context_t *ctx,
        hwc_display_contents_1_t* list) {
    for(int index = 0 ; index < mCurrentFrame.layerCount; index++) {

        if(mCurrentFrame.isFBComposed[index]) continue;

        hwc_layer_1_t* layer = &list->hwLayers[index];
        private_handle_t *hnd = (private_handle_t *)layer->handle;
        hwc_rect_t dst = layer->displayFrame;
        const int lSplit = getLeftSplit(ctx, mDpy);
        if(isYUVSplitNeeded(hnd) && sEnableYUVsplit){
            if((dst.left > lSplit)||(dst.right < lSplit)){
                if(allocSplitVGPipes(ctx, index)){
                    continue;
                }
            }
        }
        //XXX: Check for forced 2D composition
        if(needs3DComposition(ctx, mDpy) && get3DFormat(hnd) != HAL_NO_3D)
            if(allocSplitVGPipes(ctx,index))
                continue;

        int mdpIndex = mCurrentFrame.layerToMDP[index];
        PipeLayerPair& info = mCurrentFrame.mdpToLayer[mdpIndex];
        info.pipeInfo = new MdpPipeInfoSplit;
        info.rot = NULL;
        MdpPipeInfoSplit& pipe_info = *(MdpPipeInfoSplit*)info.pipeInfo;

        if(!acquireMDPPipes(ctx, layer, pipe_info)) {
            ALOGD_IF(isDebug(), "%s: Unable to get pipe for type",
                    __FUNCTION__);
            return false;
        }
    }
    return true;
}

int MDPCompSplit::configure4k2kYuv(hwc_context_t *ctx, hwc_layer_1_t *layer,
        PipeLayerPair& PipeLayerPair) {
    const int lSplit = getLeftSplit(ctx, mDpy);
    hwc_rect_t dst = layer->displayFrame;
    if((dst.left > lSplit)||(dst.right < lSplit)){
        MdpYUVPipeInfo& mdp_info =
                *(static_cast<MdpYUVPipeInfo*>(PipeLayerPair.pipeInfo));
        eZorder zOrder = static_cast<eZorder>(mdp_info.zOrder);
        eMdpFlags mdpFlagsL = ovutils::OV_MDP_FLAGS_NONE;
        eDest lDest = mdp_info.lIndex;
        eDest rDest = mdp_info.rIndex;

        return configureSourceSplit(ctx, layer, mDpy, mdpFlagsL, zOrder,
                lDest, rDest, &PipeLayerPair.rot);
    }
    else{
        return configure(ctx, layer, PipeLayerPair);
    }
}

/*
 * Configures pipe(s) for MDP composition
 */
int MDPCompSplit::configure(hwc_context_t *ctx, hwc_layer_1_t *layer,
        PipeLayerPair& PipeLayerPair) {
    MdpPipeInfoSplit& mdp_info =
        *(static_cast<MdpPipeInfoSplit*>(PipeLayerPair.pipeInfo));
    eZorder zOrder = static_cast<eZorder>(mdp_info.zOrder);
    eMdpFlags mdpFlagsL = ovutils::OV_MDP_FLAGS_NONE;
    eDest lDest = mdp_info.lIndex;
    eDest rDest = mdp_info.rIndex;

    ALOGD_IF(isDebug(),"%s: configuring: layer: %p z_order: %d dest_pipeL: %d"
            "dest_pipeR: %d",__FUNCTION__, layer, zOrder, lDest, rDest);

    return configureSplit(ctx, layer, mDpy, mdpFlagsL, zOrder, lDest,
            rDest, &PipeLayerPair.rot);
}

bool MDPCompSplit::draw(hwc_context_t *ctx, hwc_display_contents_1_t* list) {

    if(!isEnabled() or !mModeOn) {
        ALOGD_IF(isDebug(),"%s: MDP Comp not enabled/configured", __FUNCTION__);
        return true;
    }

    overlay::Overlay& ov = *ctx->mOverlay;
    LayerProp *layerProp = ctx->layerProp[mDpy];

    int numHwLayers = ctx->listStats[mDpy].numAppLayers;
    for(int i = 0; i < numHwLayers && mCurrentFrame.mdpCount; i++ )
    {
        if(mCurrentFrame.isFBComposed[i]) continue;

        hwc_layer_1_t *layer = &list->hwLayers[i];
        private_handle_t *hnd = (private_handle_t *)layer->handle;
        if(!hnd) {
            ALOGE("%s handle null", __FUNCTION__);
            return false;
        }

        if(!(layerProp[i].mFlags & HWC_MDPCOMP)) {
            continue;
        }

        int mdpIndex = mCurrentFrame.layerToMDP[i];

        if((isYUVSplitNeeded(hnd) && sEnableYUVsplit) ||
                (needs3DComposition(ctx, mDpy) && get3DFormat(hnd) != HAL_NO_3D))
        {
            MdpYUVPipeInfo& pipe_info =
                *(MdpYUVPipeInfo*)mCurrentFrame.mdpToLayer[mdpIndex].pipeInfo;
            Rotator *rot = mCurrentFrame.mdpToLayer[mdpIndex].rot;
            ovutils::eDest indexL = pipe_info.lIndex;
            ovutils::eDest indexR = pipe_info.rIndex;
            int fd = hnd->fd;
            uint32_t offset = (uint32_t)hnd->offset;
            if(rot) {
                rot->queueBuffer(fd, offset);
                fd = rot->getDstMemId();
                offset = rot->getDstOffset();
            }
            if(indexL != ovutils::OV_INVALID) {
                ovutils::eDest destL = (ovutils::eDest)indexL;
                ALOGD_IF(isDebug(),"%s: MDP Comp: Drawing layer: %p hnd: %p \
                        using  pipe: %d", __FUNCTION__, layer, hnd, indexL );
                if (!ov.queueBuffer(fd, offset, destL)) {
                    ALOGE("%s: queueBuffer failed for display:%d",
                            __FUNCTION__, mDpy);
                    return false;
                }
            }

            if(indexR != ovutils::OV_INVALID) {
                ovutils::eDest destR = (ovutils::eDest)indexR;
                ALOGD_IF(isDebug(),"%s: MDP Comp: Drawing layer: %p hnd: %p \
                        using  pipe: %d", __FUNCTION__, layer, hnd, indexR );
                if (!ov.queueBuffer(fd, offset, destR)) {
                    ALOGE("%s: queueBuffer failed for display:%d",
                            __FUNCTION__, mDpy);
                    return false;
                }
            }
        }
        else{
            MdpPipeInfoSplit& pipe_info =
                *(MdpPipeInfoSplit*)mCurrentFrame.mdpToLayer[mdpIndex].pipeInfo;
            Rotator *rot = mCurrentFrame.mdpToLayer[mdpIndex].rot;

            ovutils::eDest indexL = pipe_info.lIndex;
            ovutils::eDest indexR = pipe_info.rIndex;

            int fd = hnd->fd;
            uint32_t offset = (uint32_t)hnd->offset;
            int index = ctx->mPtorInfo.getPTORArrayIndex(i);
            if (!mDpy && (index != -1)) {
                hnd = ctx->mCopyBit[mDpy]->getCurrentRenderBuffer();
                fd = hnd->fd;
                offset = 0;
            }

            if(ctx->mAD->draw(ctx, fd, offset)) {
                fd = ctx->mAD->getDstFd();
                offset = ctx->mAD->getDstOffset();
            }

            if(rot) {
                rot->queueBuffer(fd, offset);
                fd = rot->getDstMemId();
                offset = rot->getDstOffset();
            }

            //************* play left mixer **********
            if(indexL != ovutils::OV_INVALID) {
                ovutils::eDest destL = (ovutils::eDest)indexL;
                ALOGD_IF(isDebug(),"%s: MDP Comp: Drawing layer: %p hnd: %p \
                        using  pipe: %d", __FUNCTION__, layer, hnd, indexL );
                if (!ov.queueBuffer(fd, offset, destL)) {
                    ALOGE("%s: queueBuffer failed for left mixer",
                            __FUNCTION__);
                    return false;
                }
            }

            //************* play right mixer **********
            if(indexR != ovutils::OV_INVALID) {
                ovutils::eDest destR = (ovutils::eDest)indexR;
                ALOGD_IF(isDebug(),"%s: MDP Comp: Drawing layer: %p hnd: %p \
                        using  pipe: %d", __FUNCTION__, layer, hnd, indexR );
                if (!ov.queueBuffer(fd, offset, destR)) {
                    ALOGE("%s: queueBuffer failed for right mixer",
                            __FUNCTION__);
                    return false;
                }
            }
        }

        layerProp[i].mFlags &= ~HWC_MDPCOMP;
    }

    return true;
}

//================MDPCompSrcSplit==============================================

bool MDPCompSrcSplit::validateAndApplyROI(hwc_context_t *ctx,
        hwc_display_contents_1_t* list) {
    int numAppLayers = ctx->listStats[mDpy].numAppLayers;
    hwc_rect_t visibleRect = ctx->listStats[mDpy].lRoi;

    for(int i = numAppLayers - 1; i >= 0; i--) {
        if(!isValidRect(visibleRect)) {
            mCurrentFrame.drop[i] = true;
            mCurrentFrame.dropCount++;
            continue;
        }

        const hwc_layer_1_t* layer =  &list->hwLayers[i];
        hwc_rect_t dstRect = layer->displayFrame;
        hwc_rect_t res  = getIntersection(visibleRect, dstRect);

        if(!isValidRect(res)) {
            mCurrentFrame.drop[i] = true;
            mCurrentFrame.dropCount++;
        } else {
            /* Reset frame ROI when any layer which needs scaling also needs ROI
             * cropping */
            if(!isSameRect(res, dstRect) && needsScaling (layer)) {
                ALOGI("%s: Resetting ROI due to scaling", __FUNCTION__);
                memset(&mCurrentFrame.drop, 0, sizeof(mCurrentFrame.drop));
                mCurrentFrame.dropCount = 0;
                return false;
            }

            /* deduct any opaque region from visibleRect */
            if (layer->blending == HWC_BLENDING_NONE &&
                    layer->planeAlpha == 0xFF)
                visibleRect = deductRect(visibleRect, res);
        }
    }
    return true;
}

/*
 * HW Limitation: ping pong split can always split the ping pong output
 * equally across two DSI's. So the ROI programmed should be of equal width
 * for both the halves
 */
void MDPCompSrcSplit::generateROI(hwc_context_t *ctx,
        hwc_display_contents_1_t* list) {
    int numAppLayers = ctx->listStats[mDpy].numAppLayers;


    if(!canPartialUpdate(ctx, list))
        return;

    struct hwc_rect roi = (struct hwc_rect){0, 0, 0, 0};
    hwc_rect fullFrame = (struct hwc_rect) {0, 0,(int)ctx->dpyAttr[mDpy].xres,
        (int)ctx->dpyAttr[mDpy].yres};

    for(int index = 0; index < numAppLayers; index++ ) {
        hwc_layer_1_t* layer = &list->hwLayers[index];

        // If we have a RGB layer which needs rotation, no partial update
        if(!isYuvBuffer((private_handle_t *)layer->handle) && layer->transform)
            return;

        if ((mCachedFrame.hnd[index] != layer->handle) ||
                isYuvBuffer((private_handle_t *)layer->handle)) {
            hwc_rect_t dst = layer->displayFrame;
            hwc_rect_t updatingRect = dst;

#ifdef QCOM_BSP
            if(!needsScaling(layer) && !layer->transform)
            {
                hwc_rect_t src = integerizeSourceCrop(layer->sourceCropf);
                int x_off = dst.left - src.left;
                int y_off = dst.top - src.top;
                updatingRect = moveRect(layer->dirtyRect, x_off, y_off);
            }
#endif

            roi = getUnion(roi, updatingRect);
        }
    }

    /* No layer is updating. Still SF wants a refresh.*/
    if(!isValidRect(roi))
        return;

    roi = expandROIFromMidPoint(roi, fullFrame);

    hwc_rect lFrame = fullFrame;
    lFrame.right /= 2;
    hwc_rect lRoi = getIntersection(roi, lFrame);

    // Align ROI coordinates to panel restrictions
    lRoi = getSanitizeROI(lRoi, lFrame);

    hwc_rect rFrame = fullFrame;
    rFrame.left = lFrame.right;
    hwc_rect rRoi = getIntersection(roi, rFrame);

    // Align ROI coordinates to panel restrictions
    rRoi = getSanitizeROI(rRoi, rFrame);

    roi = getUnion(lRoi, rRoi);

    ctx->listStats[mDpy].lRoi = roi;
    if(!validateAndApplyROI(ctx, list))
        resetROI(ctx, mDpy);

    ALOGD_IF(isDebug(),"%s: generated ROI: [%d, %d, %d, %d] [%d, %d, %d, %d]",
            __FUNCTION__,
            ctx->listStats[mDpy].lRoi.left, ctx->listStats[mDpy].lRoi.top,
            ctx->listStats[mDpy].lRoi.right, ctx->listStats[mDpy].lRoi.bottom,
            ctx->listStats[mDpy].rRoi.left, ctx->listStats[mDpy].rRoi.top,
            ctx->listStats[mDpy].rRoi.right, ctx->listStats[mDpy].rRoi.bottom);
}

bool MDPCompSrcSplit::acquireMDPPipes(hwc_context_t *ctx, hwc_layer_1_t* layer,
        MdpPipeInfoSplit& pipe_info) {
    private_handle_t *hnd = (private_handle_t *)layer->handle;
    hwc_rect_t dst = layer->displayFrame;
    hwc_rect_t crop = integerizeSourceCrop(layer->sourceCropf);
    pipe_info.lIndex = ovutils::OV_INVALID;
    pipe_info.rIndex = ovutils::OV_INVALID;

    if(qdutils::MDPVersion::getInstance().isPartialUpdateEnabled() && !mDpy)
        trimAgainstROI(ctx,crop, dst);

    //If 2 pipes are staged on a single stage of a mixer, then the left pipe
    //should have a higher priority than the right one. Pipe priorities are
    //starting with VG0, VG1 ... , RGB0 ..., DMA1

    Overlay::PipeSpecs pipeSpecs;
    pipeSpecs.formatClass = isYuvBuffer(hnd) ?
            Overlay::FORMAT_YUV : Overlay::FORMAT_RGB;
    pipeSpecs.needsScaling = qhwc::needsScaling(layer);
    pipeSpecs.dpy = mDpy;
    pipeSpecs.fb = false;

    //1 pipe by default for a layer
    pipe_info.lIndex = ctx->mOverlay->getPipe(pipeSpecs);
    if(pipe_info.lIndex == ovutils::OV_INVALID) {
        return false;
    }

    /* Use 2 pipes IF
        a) Layer's crop width is > 2048 or
        b) Layer's dest width > 2048 or
        c) On primary, driver has indicated with caps to split always. This is
           based on an empirically derived value of panel height. Applied only
           if the layer's width is > mixer's width
    */

    MDPVersion& mdpHw = MDPVersion::getInstance();
    bool primarySplitAlways = (mDpy == HWC_DISPLAY_PRIMARY) and
            mdpHw.isSrcSplitAlways();
    const uint32_t lSplit = getLeftSplit(ctx, mDpy);
    const uint32_t dstWidth = dst.right - dst.left;
    const uint32_t dstHeight = dst.bottom - dst.top;
    uint32_t cropWidth = has90Transform(layer) ? crop.bottom - crop.top :
            crop.right - crop.left;
    uint32_t cropHeight = has90Transform(layer) ? crop.right - crop.left :
            crop.bottom - crop.top;
    //Approximation to actual clock, ignoring the common factors in pipe and
    //mixer cases like line_time
    const uint32_t layerClock = getLayerClock(dstWidth, dstHeight, cropHeight);
    const uint32_t mixerClock = lSplit;

    const uint32_t downscale = getRotDownscale(ctx, layer);
    if(downscale) {
        cropWidth /= downscale;
        cropHeight /= downscale;
    }

    if(dstWidth > mdpHw.getMaxPipeWidth() or
            cropWidth > mdpHw.getMaxPipeWidth() or
            (primarySplitAlways and
            (cropWidth > lSplit or layerClock > mixerClock))) {
        pipe_info.rIndex = ctx->mOverlay->getPipe(pipeSpecs);
        if(pipe_info.rIndex == ovutils::OV_INVALID) {
            return false;
        }

        if(ctx->mOverlay->needsPrioritySwap(pipe_info.lIndex,
                    pipe_info.rIndex)) {
            qhwc::swap(pipe_info.lIndex, pipe_info.rIndex);
        }
    }

    return true;
}

int MDPCompSrcSplit::configure(hwc_context_t *ctx, hwc_layer_1_t *layer,
        PipeLayerPair& PipeLayerPair) {
    private_handle_t *hnd = (private_handle_t *)layer->handle;
    if(!hnd) {
        ALOGE("%s: layer handle is NULL", __FUNCTION__);
        return -1;
    }
    MetaData_t *metadata = (MetaData_t *)hnd->base_metadata;
    MdpPipeInfoSplit& mdp_info =
        *(static_cast<MdpPipeInfoSplit*>(PipeLayerPair.pipeInfo));
    Rotator **rot = &PipeLayerPair.rot;
    eZorder z = static_cast<eZorder>(mdp_info.zOrder);
    eDest lDest = mdp_info.lIndex;
    eDest rDest = mdp_info.rIndex;
    hwc_rect_t crop = integerizeSourceCrop(layer->sourceCropf);
    hwc_rect_t dst = layer->displayFrame;
    int transform = layer->transform;
    eTransform orient = static_cast<eTransform>(transform);
    int rotFlags = ROT_FLAGS_NONE;
    uint32_t format = ovutils::getMdpFormat(hnd->format, hnd->flags);
    Whf whf(getWidth(hnd), getHeight(hnd), format, hnd->size);
    eMdpFlags mdpFlags = ovutils::OV_MDP_FLAGS_NONE;

    ALOGD_IF(isDebug(),"%s: configuring: layer: %p z_order: %d dest_pipeL: %d"
             "dest_pipeR: %d",__FUNCTION__, layer, z, lDest, rDest);

    if(qdutils::MDPVersion::getInstance().isPartialUpdateEnabled() && !mDpy) {
        /* MDP driver crops layer coordinates against ROI in Non-Split
         * and Split MDP comp. But HWC needs to crop them for source split.
         * Reason: 1) Source split is efficient only when the final effective
         *            load is distributed evenly across mixers.
         *         2) We have to know the effective width of the layer that
         *            the ROI needs to find the no. of pipes the layer needs.
         */
        trimAgainstROI(ctx, crop, dst);
    }

    if(needs3DComposition(ctx, mDpy) &&
            get3DFormat(hnd) != HAL_NO_3D){
        return configure3DVideo(ctx, layer, mDpy, mdpFlags, z, lDest,
                rDest, &PipeLayerPair.rot);
    }

    // Handle R/B swap
    if (layer->flags & HWC_FORMAT_RB_SWAP) {
        if (hnd->format == HAL_PIXEL_FORMAT_RGBA_8888)
            whf.format = getMdpFormat(HAL_PIXEL_FORMAT_BGRA_8888);
        else if (hnd->format == HAL_PIXEL_FORMAT_RGBX_8888)
            whf.format = getMdpFormat(HAL_PIXEL_FORMAT_BGRX_8888);
    }
    // update source crop and destination position of AIV video layer.
    if(ctx->listStats[mDpy].mAIVVideoMode && isYuvBuffer(hnd)) {
        updateCoordinates(ctx, crop, dst, mDpy);
    }
    /* Calculate the external display position based on MDP downscale,
       ActionSafe, and extorientation features. */
    calcExtDisplayPosition(ctx, hnd, mDpy, crop, dst, transform, orient);

    int downscale = getRotDownscale(ctx, layer);
    setMdpFlags(ctx, layer, mdpFlags, downscale, transform);

    if(lDest != OV_INVALID && rDest != OV_INVALID) {
        //Enable overfetch
        setMdpFlags(mdpFlags, OV_MDSS_MDP_DUAL_PIPE);
    }

    if((has90Transform(layer) or downscale) and isRotationDoable(ctx, hnd)) {
        (*rot) = ctx->mRotMgr->getNext();
        if((*rot) == NULL) return -1;
        ctx->mLayerRotMap[mDpy]->add(layer, *rot);
        //If the video is using a single pipe, enable BWC
        if(rDest == OV_INVALID) {
            BwcPM::setBwc(ctx, mDpy, hnd, crop, dst, transform, downscale,
                    mdpFlags);
        }
        //Configure rotator for pre-rotation
        if(configRotator(*rot, whf, crop, mdpFlags, orient, downscale) < 0) {
            ALOGE("%s: configRotator failed!", __FUNCTION__);
            return -1;
        }
        updateSource(orient, whf, crop, *rot);
        rotFlags |= ovutils::ROT_PREROTATED;
    }

    //If 2 pipes being used, divide layer into half, crop and dst
    hwc_rect_t cropL = crop;
    hwc_rect_t cropR = crop;
    hwc_rect_t dstL = dst;
    hwc_rect_t dstR = dst;
    if(lDest != OV_INVALID && rDest != OV_INVALID) {
        cropL.right = (crop.right + crop.left) / 2;
        cropR.left = cropL.right;
        sanitizeSourceCrop(cropL, cropR, hnd);

        bool cropSwap = false;
        //Swap crops on H flip since 2 pipes are being used
        if((orient & OVERLAY_TRANSFORM_FLIP_H) && (*rot) == NULL) {
            hwc_rect_t tmp = cropL;
            cropL = cropR;
            cropR = tmp;
            cropSwap = true;
        }

        //cropSwap trick: If the src and dst widths are both odd, let us say
        //2507, then splitting both into half would cause left width to be 1253
        //and right 1254. If crop is swapped because of H flip, this will cause
        //left crop width to be 1254, whereas left dst width remains 1253, thus
        //inducing a scaling that is unaccounted for. To overcome that we add 1
        //to the dst width if there is a cropSwap. So if the original width was
        //2507, the left dst width will be 1254. Even if the original width was
        //even for ex: 2508, the left dst width will still remain 1254.
        dstL.right = (dst.right + dst.left + cropSwap) / 2;
        dstR.left = dstL.right;
    }

    //For the mdp, since either we are pre-rotating or MDP does flips
    orient = OVERLAY_TRANSFORM_0;
    transform = 0;

    //configure left pipe
    if(lDest != OV_INVALID) {
        PipeArgs pargL(mdpFlags, whf, z,
                static_cast<eRotFlags>(rotFlags), layer->planeAlpha,
                (ovutils::eBlending) getBlending(layer->blending));

        if(configMdp(ctx->mOverlay, pargL, orient,
                    cropL, dstL, metadata, lDest) < 0) {
            ALOGE("%s: commit failed for left mixer config", __FUNCTION__);
            return -1;
        }
    }

    //configure right pipe
    if(rDest != OV_INVALID) {
        PipeArgs pargR(mdpFlags, whf, z,
                static_cast<eRotFlags>(rotFlags),
                layer->planeAlpha,
                (ovutils::eBlending) getBlending(layer->blending));
        if(configMdp(ctx->mOverlay, pargR, orient,
                    cropR, dstR, metadata, rDest) < 0) {
            ALOGE("%s: commit failed for right mixer config", __FUNCTION__);
            return -1;
        }
    }

    return 0;
}

bool MDPComp::getPartialUpdatePref(hwc_context_t *ctx) {
    Locker::Autolock _l(ctx->mDrawLock);
    const int fbNum = Overlay::getFbForDpy(Overlay::DPY_PRIMARY);
    char path[MAX_SYSFS_FILE_PATH];
    snprintf (path, sizeof(path), "sys/class/graphics/fb%d/dyn_pu", fbNum);
    int fd = open(path, O_RDONLY);
    if(fd < 0) {
        ALOGE("%s: Failed to open sysfd node: %s", __FUNCTION__, path);
        return -1;
    }
    char value[4];
    ssize_t size_read = read(fd, value, sizeof(value)-1);
    if(size_read <= 0) {
        ALOGE("%s: Failed to read sysfd node: %s", __FUNCTION__, path);
        close(fd);
        return -1;
    }
    close(fd);
    value[size_read] = '\0';
    return atoi(value);
}

int MDPComp::setPartialUpdatePref(hwc_context_t *ctx, bool enable) {
    Locker::Autolock _l(ctx->mDrawLock);
    const int fbNum = Overlay::getFbForDpy(Overlay::DPY_PRIMARY);
    char path[MAX_SYSFS_FILE_PATH];
    snprintf (path, sizeof(path), "sys/class/graphics/fb%d/dyn_pu", fbNum);
    int fd = open(path, O_WRONLY);
    if(fd < 0) {
        ALOGE("%s: Failed to open sysfd node: %s", __FUNCTION__, path);
        return -1;
    }
    char value[4];
    snprintf(value, sizeof(value), "%d", (int)enable);
    ssize_t ret = write(fd, value, strlen(value));
    if(ret <= 0) {
        ALOGE("%s: Failed to write to sysfd nodes: %s", __FUNCTION__, path);
        close(fd);
        return -1;
    }
    close(fd);
    return 0;
}

bool MDPComp::loadPerfLib() {
    char perfLibPath[PROPERTY_VALUE_MAX] = {0};
    bool success = false;
    if((property_get("ro.vendor.extension_library", perfLibPath, NULL) <= 0)) {
        ALOGE("vendor library not set in ro.vendor.extension_library");
        return false;
    }

    sLibPerfHint = dlopen(perfLibPath, RTLD_NOW);
    if(sLibPerfHint) {
        *(void **)&sPerfLockAcquire = dlsym(sLibPerfHint, "perf_lock_acq");
        *(void **)&sPerfLockRelease = dlsym(sLibPerfHint, "perf_lock_rel");
        if (!sPerfLockAcquire || !sPerfLockRelease) {
            ALOGE("Failed to load symbols for perfLock");
            dlclose(sLibPerfHint);
            sLibPerfHint = NULL;
            return false;
        }
        success = true;
        ALOGI("Successfully Loaded perf hint API's");
    } else {
        ALOGE("Failed to open %s : %s", perfLibPath, dlerror());
    }
    return success;
}

void MDPComp::setPerfHint(hwc_context_t *ctx, hwc_display_contents_1_t* list) {
    if ((sPerfHintWindow < 0) || mDpy || !sLibPerfHint) {
        return;
    }
    static int count = sPerfHintWindow;
    static int perflockFlag = 0;

    /* Send hint to mpctl when single layer is updated
     * for a successful number of windows. Hint release
     * happens immediately upon multiple layer update.
     */
    if (onlyVideosUpdating(ctx, list)) {
        if(count) {
            count--;
        }
    } else {
        if (perflockFlag) {
            perflockFlag = 0;
            sPerfLockRelease(sPerfLockHandle);
        }
        count = sPerfHintWindow;
    }
    if (count == 0 && !perflockFlag) {
        int perfHint = 0x4501; // 45-display layer hint, 01-Enable
        sPerfLockHandle = sPerfLockAcquire(0 /*handle*/, 0/*duration*/,
                                    &perfHint, sizeof(perfHint)/sizeof(int));
        if(sPerfLockHandle > 0) {
            perflockFlag = 1;
        }
    }
}

}; //namespace