composer/hwc_tonemapper.cpp - LeafOS-Project/android_hardware_qcom_display - Gitiles

 /*
 * Copyright (c) 2016 - 2017, 2020-2021 The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials provided
 *    with the distribution.
 *  * Neither the name of The Linux Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

 #include <QtiGralloc.h>
 #include <sync/sync.h>

 #include <TonemapFactory.h>

 #include <core/buffer_allocator.h>

 #include <utils/constants.h>
 #include <utils/debug.h>
 #include <utils/formats.h>
 #include <utils/rect.h>
 #include <utils/utils.h>

 #include <vector>

 #include "hwc_debugger.h"
 #include "hwc_tonemapper.h"

 #define __CLASS__ "HWCToneMapper"

 namespace sdm {

 ToneMapSession::ToneMapSession(HWCBufferAllocator *buffer_allocator)
   : tone_map_task_(*this), buffer_allocator_(buffer_allocator) {
   buffer_info_.resize(kNumIntermediateBuffers);
 }

 ToneMapSession::~ToneMapSession() {
   tone_map_task_.PerformTask(ToneMapTaskCode::kCodeDestroy, nullptr);
   FreeIntermediateBuffers();
   buffer_info_.clear();
 }

 void ToneMapSession::OnTask(const ToneMapTaskCode &task_code,
                             SyncTask<ToneMapTaskCode>::TaskContext *task_context) {
   switch (task_code) {
 #ifndef TARGET_HEADLESS
     case ToneMapTaskCode::kCodeGetInstance: {
         ToneMapGetInstanceContext *ctx = static_cast<ToneMapGetInstanceContext *>(task_context);
         Lut3d &lut_3d = ctx->layer->lut_3d;
         Color10Bit *grid_entries = NULL;
         int grid_size = 0;
         if (lut_3d.validGridEntries) {
           grid_entries = lut_3d.gridEntries;
           grid_size = INT(lut_3d.gridSize);
         }
         gpu_tone_mapper_ = TonemapperFactory_GetInstance(tone_map_config_.type,
                                                          lut_3d.lutEntries, lut_3d.dim,
                                                          grid_entries, grid_size,
                                                          tone_map_config_.secure);
       }
       break;

     case ToneMapTaskCode::kCodeBlit: {
         ToneMapBlitContext *ctx = static_cast<ToneMapBlitContext *>(task_context);
         uint8_t buffer_index = current_buffer_index_;
         const void *dst_hnd = reinterpret_cast<const void *>
                                 (buffer_info_[buffer_index].private_data);
         const void *src_hnd = reinterpret_cast<const void *>
                                 (ctx->layer->input_buffer.buffer_id);
         int fence = gpu_tone_mapper_->blit(dst_hnd, src_hnd, Fence::Dup(ctx->merged));
         ctx->fence = Fence::Create(fence, "tonemap");
       }
       break;

     case ToneMapTaskCode::kCodeDestroy: {
         delete gpu_tone_mapper_;
       }
       break;

 #endif
     default:
       break;
   }
 }

 DisplayError ToneMapSession::AllocateIntermediateBuffers(const Layer *layer) {
   for (uint8_t i = 0; i < kNumIntermediateBuffers; i++) {
     BufferInfo &buffer_info = buffer_info_[i];
     buffer_info.buffer_config.width = layer->request.width;
     buffer_info.buffer_config.height = layer->request.height;
     buffer_info.buffer_config.format = layer->request.format;
     buffer_info.buffer_config.secure = layer->request.flags.secure;
     buffer_info.buffer_config.gfx_client = true;
     int err = buffer_allocator_->AllocateBuffer(&buffer_info);
     if (err != 0) {
       FreeIntermediateBuffers();
       return kErrorUndefined;
     }
   }

   return kErrorNone;
 }

 void ToneMapSession::FreeIntermediateBuffers() {
   for (uint8_t i = 0; i < kNumIntermediateBuffers; i++) {
     BufferInfo &buffer_info = buffer_info_[i];
     if (buffer_info.private_data) {
       buffer_allocator_->FreeBuffer(&buffer_info);
     }
   }
 }

 void ToneMapSession::UpdateBuffer(const shared_ptr<Fence> &acquire_fence, LayerBuffer *buffer) {
   // Acquire fence will be closed by HWC Display.
   // Fence returned by GPU will be closed in PostCommit.
   buffer->acquire_fence = acquire_fence;
   buffer->size = buffer_info_[current_buffer_index_].alloc_buffer_info.size;
   buffer->planes[0].fd = buffer_info_[current_buffer_index_].alloc_buffer_info.fd;
   buffer->handle_id = buffer_info_[current_buffer_index_].alloc_buffer_info.id;
 }

 void ToneMapSession::SetReleaseFence(const shared_ptr<Fence> &fd) {
   release_fence_[current_buffer_index_] = fd;
 }

 void ToneMapSession::SetToneMapConfig(Layer *layer, PrimariesTransfer blend_cs) {
   // HDR -> SDR is FORWARD and SDR - > HDR is INVERSE
   tone_map_config_.type = layer->input_buffer.flags.hdr ? TONEMAP_FORWARD : TONEMAP_INVERSE;
   tone_map_config_.blend_cs = blend_cs;
   tone_map_config_.transfer = layer->input_buffer.color_metadata.transfer;
   tone_map_config_.secure = layer->request.flags.secure;
   tone_map_config_.format = layer->request.format;
 }

 bool ToneMapSession::IsSameToneMapConfig(Layer *layer, PrimariesTransfer blend_cs) {
   LayerBuffer& buffer = layer->input_buffer;
   native_handle_t *handle = static_cast<native_handle_t *>(buffer_info_[0].private_data);
   int tonemap_type = buffer.flags.hdr ? TONEMAP_FORWARD : TONEMAP_INVERSE;

   uint32_t handle_unaligned_width, handle_unaligned_height = 0;
   buffer_allocator_->GetUnalignedWidth(handle, handle_unaligned_width);
   buffer_allocator_->GetUnalignedHeight(handle, handle_unaligned_height);
   return ((tonemap_type == tone_map_config_.type) && (blend_cs == tone_map_config_.blend_cs) &&
           (buffer.color_metadata.transfer == tone_map_config_.transfer) &&
           (layer->request.flags.secure == tone_map_config_.secure) &&
           (layer->request.format == tone_map_config_.format) &&
           (layer->request.width == handle_unaligned_width) &&
           (layer->request.height == handle_unaligned_height));
 }

 int HWCToneMapper::HandleToneMap(LayerStack *layer_stack) {
   uint32_t gpu_count = 0;
   DisplayError error = kErrorNone;

   for (uint32_t i = 0; i < layer_stack->layers.size(); i++) {
     uint32_t session_index = 0;
     Layer *layer = layer_stack->layers.at(i);
     if (layer->composition == kCompositionGPU) {
       gpu_count++;
     }

     if (layer->request.flags.tone_map) {
       DLOGV_IF(kTagClient, "Tonemapping for layer at index %d", i);
       switch (layer->composition) {
       case kCompositionGPUTarget:
         if (!gpu_count) {
           // When all layers are on FrameBuffer and if they do not update in the next draw cycle,
           // then SDM marks them for SDE Composition because the cached FB layer gets displayed.
           // GPU count will be 0 in this case. Try to use the existing tone-mapped frame buffer.
           // No ToneMap/Blit is required. Just update the buffer & acquire fence fd of FB layer.
           if (!tone_map_sessions_.empty() && (fb_session_index_ >= 0)) {
             ToneMapSession *fb_tone_map_session = tone_map_sessions_.at(UINT32(fb_session_index_));
             fb_tone_map_session->UpdateBuffer(nullptr /* acquire_fence */, &layer->input_buffer);
             fb_tone_map_session->layer_index_ = INT(i);
             fb_tone_map_session->acquired_ = true;
             return 0;
           }
         }
         error = AcquireToneMapSession(layer, &session_index, layer_stack->blend_cs);
         fb_session_index_ = INT(session_index);
         break;
       default:
         error = AcquireToneMapSession(layer, &session_index, layer_stack->blend_cs);
         break;
       }

       if (error != kErrorNone) {
         Terminate();
         return -1;
       }

       ToneMapSession *session = tone_map_sessions_.at(session_index);
       ToneMap(layer, session);
       DLOGI_IF(kTagClient, "Layer %d associated with session index %d", i, session_index);
       session->layer_index_ = INT(i);
     }
   }

   return 0;
 }

 void HWCToneMapper::ToneMap(Layer* layer, ToneMapSession *session) {
   ToneMapBlitContext ctx = {};
   ctx.layer = layer;

   uint8_t buffer_index = session->current_buffer_index_;

   // use and close the layer->input_buffer acquire fence fd.
   // remove create when rf made it as a shared_ptr
   ctx.merged = Fence::Merge(session->release_fence_[buffer_index],
                             layer->input_buffer.acquire_fence);

   DTRACE_BEGIN("GPU_TM_BLIT");
   session->tone_map_task_.PerformTask(ToneMapTaskCode::kCodeBlit, &ctx);
   DTRACE_END();

   DumpToneMapOutput(session, ctx.fence);
   session->UpdateBuffer(ctx.fence, &layer->input_buffer);
 }

 void HWCToneMapper::PostCommit(LayerStack *layer_stack) {
   auto it = tone_map_sessions_.begin();
   while (it != tone_map_sessions_.end()) {
     uint32_t session_index = UINT32(std::distance(tone_map_sessions_.begin(), it));
     ToneMapSession *session = tone_map_sessions_.at(session_index);
     if (session->acquired_) {
       Layer *layer = layer_stack->layers.at(UINT32(session->layer_index_));
       // Close the fd returned by GPU ToneMapper and set release fence.
       LayerBuffer &layer_buffer = layer->input_buffer;
       session->SetReleaseFence(layer_buffer.release_fence);
       session->acquired_ = false;
       it++;
     } else {
       DLOGI_IF(kTagClient, "Tone map session %d closed.", session_index);
       delete session;
       it = tone_map_sessions_.erase(it);
       int deleted_session = INT(session_index);
       // If FB tonemap session gets deleted, reset fb_session_index_, else update it.
       if (deleted_session == fb_session_index_) {
         fb_session_index_ = -1;
       } else if (deleted_session < fb_session_index_) {
         fb_session_index_--;
       }
     }
   }
 }

 void HWCToneMapper::Terminate() {
   if (tone_map_sessions_.size()) {
     while (!tone_map_sessions_.empty()) {
       delete tone_map_sessions_.back();
       tone_map_sessions_.pop_back();
     }
     fb_session_index_ = -1;
   }
 }

 void HWCToneMapper::SetFrameDumpConfig(uint32_t count) {
   DLOGI("Dump FrameConfig count = %d", count);
   dump_frame_count_ = count;
   dump_frame_index_ = 0;
 }

 void HWCToneMapper::DumpToneMapOutput(ToneMapSession *session, shared_ptr<Fence> acquire_fd) {
   int error = -1;
   if (!dump_frame_count_) {
     return;
   }

   BufferInfo &buffer_info = session->buffer_info_[session->current_buffer_index_];
   native_handle_t *target_buffer = static_cast<native_handle_t *>(buffer_info.private_data);
   Fence::Wait(acquire_fd);

   void *base_ptr = NULL;
   error = buffer_allocator_->MapBuffer(target_buffer, acquire_fd, &base_ptr);
   if (error != 0) {
     DLOGE("MapBuffer failed, base addr = %p", base_ptr);
     return;
   }

   size_t result = 0;
   char dump_file_name[PATH_MAX];
   uint32_t width, height, size = 0;
   buffer_allocator_->GetWidth((void *)target_buffer, width);
   buffer_allocator_->GetHeight((void *)target_buffer, height);
   buffer_allocator_->GetAllocationSize((void *)target_buffer, size);

   snprintf(dump_file_name, sizeof(dump_file_name),
            "%s/frame_dump_primary"
            "/tonemap_%dx%d_frame%d.raw",
            HWCDebugHandler::DumpDir(), width, height, dump_frame_index_);

   if (base_ptr != nullptr) {
     FILE* fp = fopen(dump_file_name, "w+");
     if (fp) {
       DLOGI("base addr = %p", base_ptr);
       result = fwrite(base_ptr, size, 1, fp);
       fclose(fp);
     }
   }

   dump_frame_count_--;
   dump_frame_index_++;
 }

 DisplayError HWCToneMapper::AcquireToneMapSession(Layer *layer, uint32_t *session_index,
                                                   PrimariesTransfer blend_cs) {
   // When the property vendor.display.disable_hdr_lut_gen is set, the lutEntries and gridEntries in
   // the Lut3d will be NULL, clients needs to allocate the memory and set correct 3D Lut
   // for Tonemapping.
   if (!layer->lut_3d.lutEntries || !layer->lut_3d.dim) {
     // Atleast lutEntries must be valid for GPU Tonemapper.
     DLOGE("Invalid Lut Entries or lut dimension = %d", layer->lut_3d.dim);
     return kErrorParameters;
   }

   // Check if we can re-use an existing tone map session.
   for (uint32_t i = 0; i < tone_map_sessions_.size(); i++) {
     ToneMapSession *tonemap_session = tone_map_sessions_.at(i);
     if (!tonemap_session->acquired_ && tonemap_session->IsSameToneMapConfig(layer, blend_cs)) {
       tonemap_session->current_buffer_index_ = (tonemap_session->current_buffer_index_ + 1) %
                                                 ToneMapSession::kNumIntermediateBuffers;
       tonemap_session->acquired_ = true;
       *session_index = i;
       return kErrorNone;
     }
   }

   ToneMapSession *session = new ToneMapSession(buffer_allocator_);
   if (!session) {
     return kErrorMemory;
   }

   session->SetToneMapConfig(layer, blend_cs);

   ToneMapGetInstanceContext ctx;
   ctx.layer = layer;
   session->tone_map_task_.PerformTask(ToneMapTaskCode::kCodeGetInstance, &ctx);

   if (session->gpu_tone_mapper_ == NULL) {
     DLOGE("Get Tonemapper failed!");
     delete session;
     return kErrorNotSupported;
   }
   DisplayError error = session->AllocateIntermediateBuffers(layer);
   if (error != kErrorNone) {
     DLOGE("Allocation of Intermediate Buffers failed!");
     delete session;
     return error;
   }

   session->acquired_ = true;
   tone_map_sessions_.push_back(session);
   *session_index = UINT32(tone_map_sessions_.size() - 1);

   return kErrorNone;
 }

 }  // namespace sdm
	/*
	* Copyright (c) 2016 - 2017, 2020-2021 The Linux Foundation. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are
	* met:
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following
	* disclaimer in the documentation and/or other materials provided
	* with the distribution.
	* * Neither the name of The Linux Foundation nor the names of its
	* contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
	* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
	* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
	* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include <QtiGralloc.h>
	#include <sync/sync.h>

	#include <TonemapFactory.h>

	#include <core/buffer_allocator.h>

	#include <utils/constants.h>
	#include <utils/debug.h>
	#include <utils/formats.h>
	#include <utils/rect.h>
	#include <utils/utils.h>

	#include <vector>

	#include "hwc_debugger.h"
	#include "hwc_tonemapper.h"

	#define __CLASS__ "HWCToneMapper"

	namespace sdm {

	ToneMapSession::ToneMapSession(HWCBufferAllocator *buffer_allocator)
	: tone_map_task_(*this), buffer_allocator_(buffer_allocator) {
	buffer_info_.resize(kNumIntermediateBuffers);
	}

	ToneMapSession::~ToneMapSession() {
	tone_map_task_.PerformTask(ToneMapTaskCode::kCodeDestroy, nullptr);
	FreeIntermediateBuffers();
	buffer_info_.clear();
	}

	void ToneMapSession::OnTask(const ToneMapTaskCode &task_code,
	SyncTask<ToneMapTaskCode>::TaskContext *task_context) {
	switch (task_code) {
	#ifndef TARGET_HEADLESS
	case ToneMapTaskCode::kCodeGetInstance: {
	ToneMapGetInstanceContext ctx = static_cast<ToneMapGetInstanceContext >(task_context);
	Lut3d &lut_3d = ctx->layer->lut_3d;
	Color10Bit *grid_entries = NULL;
	int grid_size = 0;
	if (lut_3d.validGridEntries) {
	grid_entries = lut_3d.gridEntries;
	grid_size = INT(lut_3d.gridSize);
	}
	gpu_tone_mapper_ = TonemapperFactory_GetInstance(tone_map_config_.type,
	lut_3d.lutEntries, lut_3d.dim,
	grid_entries, grid_size,
	tone_map_config_.secure);
	}
	break;

	case ToneMapTaskCode::kCodeBlit: {
	ToneMapBlitContext ctx = static_cast<ToneMapBlitContext >(task_context);
	uint8_t buffer_index = current_buffer_index_;
	const void dst_hnd = reinterpret_cast<const void >
	(buffer_info_[buffer_index].private_data);
	const void src_hnd = reinterpret_cast<const void >
	(ctx->layer->input_buffer.buffer_id);
	int fence = gpu_tone_mapper_->blit(dst_hnd, src_hnd, Fence::Dup(ctx->merged));
	ctx->fence = Fence::Create(fence, "tonemap");
	}
	break;

	case ToneMapTaskCode::kCodeDestroy: {
	delete gpu_tone_mapper_;
	}
	break;

	#endif
	default:
	break;
	}
	}

	DisplayError ToneMapSession::AllocateIntermediateBuffers(const Layer *layer) {
	for (uint8_t i = 0; i < kNumIntermediateBuffers; i++) {
	BufferInfo &buffer_info = buffer_info_[i];
	buffer_info.buffer_config.width = layer->request.width;
	buffer_info.buffer_config.height = layer->request.height;
	buffer_info.buffer_config.format = layer->request.format;
	buffer_info.buffer_config.secure = layer->request.flags.secure;
	buffer_info.buffer_config.gfx_client = true;
	int err = buffer_allocator_->AllocateBuffer(&buffer_info);
	if (err != 0) {
	FreeIntermediateBuffers();
	return kErrorUndefined;
	}
	}

	return kErrorNone;
	}

	void ToneMapSession::FreeIntermediateBuffers() {
	for (uint8_t i = 0; i < kNumIntermediateBuffers; i++) {
	BufferInfo &buffer_info = buffer_info_[i];
	if (buffer_info.private_data) {
	buffer_allocator_->FreeBuffer(&buffer_info);
	}
	}
	}

	void ToneMapSession::UpdateBuffer(const shared_ptr<Fence> &acquire_fence, LayerBuffer *buffer) {
	// Acquire fence will be closed by HWC Display.
	// Fence returned by GPU will be closed in PostCommit.
	buffer->acquire_fence = acquire_fence;
	buffer->size = buffer_info_[current_buffer_index_].alloc_buffer_info.size;
	buffer->planes[0].fd = buffer_info_[current_buffer_index_].alloc_buffer_info.fd;
	buffer->handle_id = buffer_info_[current_buffer_index_].alloc_buffer_info.id;
	}

	void ToneMapSession::SetReleaseFence(const shared_ptr<Fence> &fd) {
	release_fence_[current_buffer_index_] = fd;
	}

	void ToneMapSession::SetToneMapConfig(Layer *layer, PrimariesTransfer blend_cs) {
	// HDR -> SDR is FORWARD and SDR - > HDR is INVERSE
	tone_map_config_.type = layer->input_buffer.flags.hdr ? TONEMAP_FORWARD : TONEMAP_INVERSE;
	tone_map_config_.blend_cs = blend_cs;
	tone_map_config_.transfer = layer->input_buffer.color_metadata.transfer;
	tone_map_config_.secure = layer->request.flags.secure;
	tone_map_config_.format = layer->request.format;
	}

	bool ToneMapSession::IsSameToneMapConfig(Layer *layer, PrimariesTransfer blend_cs) {
	LayerBuffer& buffer = layer->input_buffer;
	native_handle_t handle = static_cast<native_handle_t >(buffer_info_[0].private_data);
	int tonemap_type = buffer.flags.hdr ? TONEMAP_FORWARD : TONEMAP_INVERSE;

	uint32_t handle_unaligned_width, handle_unaligned_height = 0;
	buffer_allocator_->GetUnalignedWidth(handle, handle_unaligned_width);
	buffer_allocator_->GetUnalignedHeight(handle, handle_unaligned_height);
	return ((tonemap_type == tone_map_config_.type) && (blend_cs == tone_map_config_.blend_cs) &&
	(buffer.color_metadata.transfer == tone_map_config_.transfer) &&
	(layer->request.flags.secure == tone_map_config_.secure) &&
	(layer->request.format == tone_map_config_.format) &&
	(layer->request.width == handle_unaligned_width) &&
	(layer->request.height == handle_unaligned_height));
	}

	int HWCToneMapper::HandleToneMap(LayerStack *layer_stack) {
	uint32_t gpu_count = 0;
	DisplayError error = kErrorNone;

	for (uint32_t i = 0; i < layer_stack->layers.size(); i++) {
	uint32_t session_index = 0;
	Layer *layer = layer_stack->layers.at(i);
	if (layer->composition == kCompositionGPU) {
	gpu_count++;
	}

	if (layer->request.flags.tone_map) {
	DLOGV_IF(kTagClient, "Tonemapping for layer at index %d", i);
	switch (layer->composition) {
	case kCompositionGPUTarget:
	if (!gpu_count) {
	// When all layers are on FrameBuffer and if they do not update in the next draw cycle,
	// then SDM marks them for SDE Composition because the cached FB layer gets displayed.
	// GPU count will be 0 in this case. Try to use the existing tone-mapped frame buffer.
	// No ToneMap/Blit is required. Just update the buffer & acquire fence fd of FB layer.
	if (!tone_map_sessions_.empty() && (fb_session_index_ >= 0)) {
	ToneMapSession *fb_tone_map_session = tone_map_sessions_.at(UINT32(fb_session_index_));
	fb_tone_map_session->UpdateBuffer(nullptr /* acquire_fence */, &layer->input_buffer);
	fb_tone_map_session->layer_index_ = INT(i);
	fb_tone_map_session->acquired_ = true;
	return 0;
	}
	}
	error = AcquireToneMapSession(layer, &session_index, layer_stack->blend_cs);
	fb_session_index_ = INT(session_index);
	break;
	default:
	error = AcquireToneMapSession(layer, &session_index, layer_stack->blend_cs);
	break;
	}

	if (error != kErrorNone) {
	Terminate();
	return -1;
	}

	ToneMapSession *session = tone_map_sessions_.at(session_index);
	ToneMap(layer, session);
	DLOGI_IF(kTagClient, "Layer %d associated with session index %d", i, session_index);
	session->layer_index_ = INT(i);
	}
	}

	return 0;
	}

	void HWCToneMapper::ToneMap(Layer* layer, ToneMapSession *session) {
	ToneMapBlitContext ctx = {};
	ctx.layer = layer;

	uint8_t buffer_index = session->current_buffer_index_;

	// use and close the layer->input_buffer acquire fence fd.
	// remove create when rf made it as a shared_ptr
	ctx.merged = Fence::Merge(session->release_fence_[buffer_index],
	layer->input_buffer.acquire_fence);

	DTRACE_BEGIN("GPU_TM_BLIT");
	session->tone_map_task_.PerformTask(ToneMapTaskCode::kCodeBlit, &ctx);
	DTRACE_END();

	DumpToneMapOutput(session, ctx.fence);
	session->UpdateBuffer(ctx.fence, &layer->input_buffer);
	}

	void HWCToneMapper::PostCommit(LayerStack *layer_stack) {
	auto it = tone_map_sessions_.begin();
	while (it != tone_map_sessions_.end()) {
	uint32_t session_index = UINT32(std::distance(tone_map_sessions_.begin(), it));
	ToneMapSession *session = tone_map_sessions_.at(session_index);
	if (session->acquired_) {
	Layer *layer = layer_stack->layers.at(UINT32(session->layer_index_));
	// Close the fd returned by GPU ToneMapper and set release fence.
	LayerBuffer &layer_buffer = layer->input_buffer;
	session->SetReleaseFence(layer_buffer.release_fence);
	session->acquired_ = false;
	it++;
	} else {
	DLOGI_IF(kTagClient, "Tone map session %d closed.", session_index);
	delete session;
	it = tone_map_sessions_.erase(it);
	int deleted_session = INT(session_index);
	// If FB tonemap session gets deleted, reset fb_session_index_, else update it.
	if (deleted_session == fb_session_index_) {
	fb_session_index_ = -1;
	} else if (deleted_session < fb_session_index_) {
	fb_session_index_--;
	}
	}
	}
	}

	void HWCToneMapper::Terminate() {
	if (tone_map_sessions_.size()) {
	while (!tone_map_sessions_.empty()) {
	delete tone_map_sessions_.back();
	tone_map_sessions_.pop_back();
	}
	fb_session_index_ = -1;
	}
	}

	void HWCToneMapper::SetFrameDumpConfig(uint32_t count) {
	DLOGI("Dump FrameConfig count = %d", count);
	dump_frame_count_ = count;
	dump_frame_index_ = 0;
	}

	void HWCToneMapper::DumpToneMapOutput(ToneMapSession *session, shared_ptr<Fence> acquire_fd) {
	int error = -1;
	if (!dump_frame_count_) {
	return;
	}

	BufferInfo &buffer_info = session->buffer_info_[session->current_buffer_index_];
	native_handle_t target_buffer = static_cast<native_handle_t >(buffer_info.private_data);
	Fence::Wait(acquire_fd);

	void *base_ptr = NULL;
	error = buffer_allocator_->MapBuffer(target_buffer, acquire_fd, &base_ptr);
	if (error != 0) {
	DLOGE("MapBuffer failed, base addr = %p", base_ptr);
	return;
	}

	size_t result = 0;
	char dump_file_name[PATH_MAX];
	uint32_t width, height, size = 0;
	buffer_allocator_->GetWidth((void *)target_buffer, width);
	buffer_allocator_->GetHeight((void *)target_buffer, height);
	buffer_allocator_->GetAllocationSize((void *)target_buffer, size);

	snprintf(dump_file_name, sizeof(dump_file_name),
	"%s/frame_dump_primary"
	"/tonemap_%dx%d_frame%d.raw",
	HWCDebugHandler::DumpDir(), width, height, dump_frame_index_);

	if (base_ptr != nullptr) {
	FILE* fp = fopen(dump_file_name, "w+");
	if (fp) {
	DLOGI("base addr = %p", base_ptr);
	result = fwrite(base_ptr, size, 1, fp);
	fclose(fp);
	}
	}

	dump_frame_count_--;
	dump_frame_index_++;
	}

	DisplayError HWCToneMapper::AcquireToneMapSession(Layer layer, uint32_t session_index,
	PrimariesTransfer blend_cs) {
	// When the property vendor.display.disable_hdr_lut_gen is set, the lutEntries and gridEntries in
	// the Lut3d will be NULL, clients needs to allocate the memory and set correct 3D Lut
	// for Tonemapping.
	if (!layer->lut_3d.lutEntries \|\| !layer->lut_3d.dim) {
	// Atleast lutEntries must be valid for GPU Tonemapper.
	DLOGE("Invalid Lut Entries or lut dimension = %d", layer->lut_3d.dim);
	return kErrorParameters;
	}

	// Check if we can re-use an existing tone map session.
	for (uint32_t i = 0; i < tone_map_sessions_.size(); i++) {
	ToneMapSession *tonemap_session = tone_map_sessions_.at(i);
	if (!tonemap_session->acquired_ && tonemap_session->IsSameToneMapConfig(layer, blend_cs)) {
	tonemap_session->current_buffer_index_ = (tonemap_session->current_buffer_index_ + 1) %
	ToneMapSession::kNumIntermediateBuffers;
	tonemap_session->acquired_ = true;
	*session_index = i;
	return kErrorNone;
	}
	}

	ToneMapSession *session = new ToneMapSession(buffer_allocator_);
	if (!session) {
	return kErrorMemory;
	}

	session->SetToneMapConfig(layer, blend_cs);

	ToneMapGetInstanceContext ctx;
	ctx.layer = layer;
	session->tone_map_task_.PerformTask(ToneMapTaskCode::kCodeGetInstance, &ctx);

	if (session->gpu_tone_mapper_ == NULL) {
	DLOGE("Get Tonemapper failed!");
	delete session;
	return kErrorNotSupported;
	}
	DisplayError error = session->AllocateIntermediateBuffers(layer);
	if (error != kErrorNone) {
	DLOGE("Allocation of Intermediate Buffers failed!");
	delete session;
	return error;
	}

	session->acquired_ = true;
	tone_map_sessions_.push_back(session);
	*session_index = UINT32(tone_map_sessions_.size() - 1);

	return kErrorNone;
	}

	} // namespace sdm