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	diff --git a/src/RecordPlayback.cpp b/src/RecordPlayback.cpp
	index a458dfc..482268e 100644
	--- a/src/RecordPlayback.cpp
	+++ b/src/RecordPlayback.cpp
	@@ -1,632 +1,753 @@
	/*
	* Copyright (C) 2019 Me and My Shadow
	*
	* This file is part of Me and My Shadow.
	*
	* Me and My Shadow is free software: you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation, either version 3 of the License, or
	* (at your option) any later version.
	*
	* Me and My Shadow is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with Me and My Shadow. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include "RecordPlayback.h"
	#include "TreeStorageNode.h"
	#include "POASerializer.h"
	#include "InputManager.h"
	#include "Functions.h"
	#include "Render.h"
	#include <fstream>
	#include <iostream>
	#include <sstream>
	#include <vector>
	#include <map>
	#include <algorithm>
	#include <assert.h>
	#include <stdio.h>
	#include <string.h>
	#include <SDL_ttf_fontfallback.h>

	#include "libs/tinyformat/tinyformat.h"

	const int MAX_MOUSE_IDLE_TIME = 1 * 40;
	-const int MAX_RECENT_FRAMES = 64;
	-const int MAX_FRAME_PER_TICK = 200;
	+const int SAVE_REGULAR_FRAME_PER_TICK = 4;

	using namespace std;

	+class FrameQueue {
	+private:
	+ struct Node {
	+ int frameNumber;
	+ size_t t;
	+ bool operator<(const Node& other) const {
	+ return t > other.t;
	+ }
	+ };
	+
	+ size_t currentTime;
	+
	+ std::vector<Node> nodes;
	+
	+public:
	+ size_t maxSize;
	+
	+public:
	+ FrameQueue(size_t maxSize = 0) : currentTime(0), maxSize(maxSize) {}
	+ bool empty() const { return nodes.empty(); }
	+ size_t size() const { return nodes.size(); }
	+ void clear() { nodes.clear(); }
	+
	+ void insertOrUpdate(int frameNumber, bool isUpdate, std::map<int, GameSaveState>& remove) {
	+ // increate time
	+ currentTime++;
	+
	+ // chcek if item is present
	+ size_t m = nodes.size();
	+ size_t i = m;
	+ if (isUpdate) {
	+ for (i = 0; i < m; i++) {
	+ if (nodes[i].frameNumber == frameNumber) break;
	+ }
	+
	+ // sanity check
	+ assert(i < m);
	+ }
	+
	+ // found it
	+ if (i < m) {
	+ nodes[i].t = currentTime;
	+
	+ // modify the heap
	+ while (i * 2 + 1 < m) {
	+ size_t j = (i * 2 + 2 < m && nodes[i * 2 + 2].t < nodes[i * 2 + 1].t) ?
	+ (i * 2 + 2) : (i * 2 + 1);
	+
	+ std::swap(nodes[i], nodes[j]);
	+ i = j;
	+ }
	+ } else if (!isUpdate) {
	+ if (maxSize == 0 \|\| nodes.size() < maxSize) {
	+ // just insert it to the end
	+ nodes.push_back(Node{ frameNumber, currentTime });
	+ } else {
	+ // pop heap
	+ std::pop_heap(nodes.begin(), nodes.end());
	+
	+ // remove least used frame
	+ auto it = remove.find(nodes.back().frameNumber);
	+ assert(it != remove.end());
	+ if (it != remove.end()) remove.erase(it);
	+
	+ nodes.back() = Node{ frameNumber, currentTime };
	+ }
	+ }
	+
	+ // sanity check
	+ assert(std::is_heap(nodes.begin(), nodes.end()));
	+ }
	+};
	+
	+class FrameCache {
	+private:
	+ //The cached frames.
	+ std::map<int, GameSaveState> cachedFrames;
	+
	+ //The (various) recent frames queue.
	+ //Currently the frame is saved permanently if frame number is a multiple of 200,
	+ //save to a key frame queue if frame number is a multiple of 40,
	+ //otherwise save to a regular frame queue
	+ FrameQueue queueRegular, queueKey;
	+public:
	+ FrameCache() : queueRegular(16), queueKey(16) {}
	+
	+ GameSaveState* getSaveState(int time, bool saveRegular) {
	+ bool isKeyframe = (time % 40) == 0;
	+
	+ if (isKeyframe \|\| saveRegular) {
	+ bool isKeyframe200 = (time % 200) == 0;
	+ bool isUpdate = cachedFrames.find(time) != cachedFrames.end();
	+
	+ if (isKeyframe200) {
	+ } else if (isKeyframe) {
	+ queueKey.insertOrUpdate(time, isUpdate, cachedFrames);
	+ } else if (saveRegular) {
	+ queueRegular.insertOrUpdate(time, isUpdate, cachedFrames);
	+ }
	+
	+ if (!isUpdate) {
	+ return &cachedFrames[time];
	+ }
	+ }
	+
	+ return NULL;
	+ }
	+
	+ GameSaveState* getLoadState(int time) {
	+ auto it = cachedFrames.find(time);
	+ return it == cachedFrames.end() ? NULL : &it->second;
	+ }
	+
	+ // find a cached frame with large time in the range (timeBegin, time].
	+ std::pair<int, GameSaveState*> findLoadState(int timeBegin, int time) {
	+ std::pair<int, GameSaveState*> ret{ -1, NULL };
	+
	+ for (auto it = cachedFrames.begin(); it != cachedFrames.end(); ++it) {
	+ if (it->first > timeBegin && it->first <= time) {
	+ ret.first = it->first;
	+ ret.second = &it->second;
	+ }
	+ }
	+
	+ return ret;
	+ }
	+};
	+
	RecordPlayback::RecordPlayback(SDL_Renderer& renderer, ImageManager& imageManager)
	: Game(renderer, imageManager)
	, lastMouseX(-1), lastMouseY(-1), mouseIdleTime(-MAX_MOUSE_IDLE_TIME)
	, replaySpeed(0x10), replayIdleTime(0), replayPaused(false)
	+ , cachedFrames(new FrameCache())
	, clickedTime(-1), loadThisNextTime(NULL)
	+ , maxFramePerTick(16)
	{
	guiTexture = imageManager.loadTexture(getDataPath() + "gfx/gui.png", renderer);

	objThemes.getCharacter(false)->createInstance(&walkingAnimation, "walkright");

	// We always show the cursor since Game hides it first.
	SDL_ShowCursor(SDL_ENABLE);
	}

	RecordPlayback::~RecordPlayback() {
	+ delete cachedFrames;
	}

	enum RecordPlaybackButtons {
	BTN_RESTART,
	BTN_REWIND,
	BTN_PREV_FRAME,
	BTN_PLAY,
	BTN_NEXT_FRAME,
	BTN_FAST_FORWARD,
	BTN_SLOWER,
	BTN_FASTER,
	};

	void RecordPlayback::handleEvents(ImageManager& imageManager, SDL_Renderer& renderer) {
	// First let Game process events.
	Game::handleEvents(imageManager, renderer);

	int clickedButton = -1, t = -1;

	const InputManagerKeys keys[8] = {
	INPUTMGR_RESTART,
	INPUTMGR_LEFT,
	INPUTMGR_PREVIOUS,
	INPUTMGR_SPACE,
	INPUTMGR_NEXT,
	INPUTMGR_RIGHT,
	INPUTMGR_UP,
	INPUTMGR_DOWN,
	};

	for (int i = 0; i < 8; i++) {
	if (inputMgr.isKeyDownEvent(keys[i])) {
	clickedButton = i;
	break;
	}
	}

	if (event.type == SDL_MOUSEBUTTONDOWN) {
	const SDL_Rect r = { 100, SCREEN_HEIGHT - 144, SCREEN_WIDTH - 200, 72 };
	const SDL_Point p = { event.button.x, event.button.y };
	if (mouseIdleTime < 0 && SDL_PointInRect(&p, &r)) {
	if (p.y < r.y + 24) {
	} else if (p.y < r.y + 40) {
	// clicked the slider
	if (p.x >= r.x + 8 && p.x < r.x + r.w - 8) {
	int x = p.x - r.x - 12;
	if (x < 0) x = 0; else if (x > r.w - 24) x = r.w - 24;

	const int maxTime = player.getRecord()->size();

	t = int(float(x) * float(maxTime) / float(r.w - 24) + 0.5f);
	if (t < 0) t = 0;
	else if (t > maxTime) t = maxTime;

	mouseIdleTime = -MAX_MOUSE_IDLE_TIME;
	}
	} else if (p.y < r.y + 64) {
	// clicked the button bar
	if (p.x >= r.x + 8 && p.x < r.x + 152) {
	clickedButton = (p.x - r.x - 8) / 24;
	} else if (p.x < r.x + r.w - 104) {
	} else if (p.x < r.x + r.w - 80) {
	clickedButton = BTN_SLOWER;
	} else if (p.x < r.x + r.w - 32) {
	} else if (p.x < r.x + r.w - 8) {
	clickedButton = BTN_FASTER;
	}
	}
	} else {
	clickedButton = BTN_PLAY;
	}
	}

	if (clickedButton >= 0) {
	switch (clickedButton) {
	case BTN_RESTART:
	t = 0;
	break;
	case BTN_REWIND:
	t = time - ((time + 20) % 40) - 20;
	if (t < 0) t = 0;
	break;
	case BTN_PREV_FRAME:
	t = time - 1;
	if (t < 0) t = 0;
	break;
	case BTN_PLAY:
	replayPaused = !replayPaused;
	break;
	case BTN_NEXT_FRAME:
	t = time + 1;
	break;
	case BTN_FAST_FORWARD:
	t = time - ((time + 20) % 40) + 60;
	break;
	case BTN_SLOWER:
	if (replaySpeed > 0x4) replaySpeed >>= 1;
	break;
	case BTN_FASTER:
	if (replaySpeed < 0x40) replaySpeed <<= 1;
	break;
	}
	mouseIdleTime = -MAX_MOUSE_IDLE_TIME;
	}

	if (t >= 0 && t != time) {
	if (t > 0) clickedTime = t;
	else restart();
	}
	}

	void RecordPlayback::restart() {
	- GameSaveState &state = cachedFrames[0];
	- player.loadStateInternal(&state.playerSaved);
	- shadow.loadStateInternal(&state.shadowSaved);
	- loadGameOnlyStateInternal(&state.gameSaved);
	+ GameSaveState *state = cachedFrames->getLoadState(0);
	+ player.loadStateInternal(&state->playerSaved);
	+ shadow.loadStateInternal(&state->shadowSaved);
	+ loadGameOnlyStateInternal(&state->gameSaved);

	player.playRecord();
	shadow.playRecord(); //???

	eventQueue.clear();

	won = false;
	}

	void RecordPlayback::logic(ImageManager& imageManager, SDL_Renderer& renderer) {
	// The number of ticks to advance.
	int m = 0;

	+ Uint64 t1 = SDL_GetPerformanceCounter();
	+
	if (clickedTime > 0 && clickedTime != time) {
	if (clickedTime > time) { // fast forward
	if (won) {
	// the game replay is finished so we can't fast forward anymore
	clickedTime = -1;
	} else {
	// find a nearest cached frame if available
	- loadThisNextTime = NULL;
	- int t = -1;
	- for (auto it = cachedFrames.begin(); it != cachedFrames.end(); ++it) {
	- if (it->first > time && it->first <= clickedTime) {
	- t = it->first;
	- loadThisNextTime = &it->second;
	- }
	- }
	+ auto state = cachedFrames->findLoadState(time, clickedTime);
	+ loadThisNextTime = state.second;

	if (loadThisNextTime) {
	// we found a suitable cached state, load it through logic().
	Game::logic(imageManager, renderer);

	// sanity check.
	- assert(time == t);
	+ assert(time == state.first);
	}

	m = clickedTime - time;

	// set a maximal advance of frames per tick to prevent game lag.
	- if (m > MAX_FRAME_PER_TICK) m = MAX_FRAME_PER_TICK;
	+ if (m > maxFramePerTick) m = maxFramePerTick;
	else clickedTime = -1;
	}
	} else { // rewind
	// find a nearest cached frame if available
	- loadThisNextTime = NULL;
	- int t = -1;
	- for (auto it = cachedFrames.begin(); it != cachedFrames.end(); ++it) {
	- if (it->first > 0 && it->first <= clickedTime) {
	- t = it->first;
	- loadThisNextTime = &it->second;
	- }
	- }
	+ auto state = cachedFrames->findLoadState(0, clickedTime);
	+ loadThisNextTime = state.second;

	if (loadThisNextTime) {
	// we found a suitable cached state, load it through logic().
	Game::logic(imageManager, renderer);

	// sanity check.
	- assert(time == t);
	+ assert(time == state.first);
	} else {
	// otherwide we need to restart from the beginning.
	restart();
	}

	m = clickedTime - time;

	// set a maximal advance of frames per tick to prevent game lag.
	- if (m > MAX_FRAME_PER_TICK) m = MAX_FRAME_PER_TICK;
	+ if (m > maxFramePerTick) m = maxFramePerTick;
	else clickedTime = -1;
	}
	} else {
	clickedTime = -1;
	}

	if (m != 0) {
	replayIdleTime = 0;
	} else {
	if (won \|\| replayPaused) {
	replayIdleTime = 0;
	} else if (replaySpeed >= 0x10) {
	m = replaySpeed >> 4;
	replayIdleTime = 0;
	} else {
	replayIdleTime += replaySpeed;
	if (replayIdleTime >= 0x10) {
	m = 1;
	replayIdleTime = 0;
	}
	}
	}

	// Let Game process logic.
	for (int i = 0; i < m; i++) {
	if (won) break;
	- if (i == m - 1) saveStateNextTime = true;
	+
	+ // save the regular frame in the end of this run, under the condition that the game runs not too slow
	+ if (i >= m - SAVE_REGULAR_FRAME_PER_TICK && maxFramePerTick >= 64) saveStateNextTime = true;
	+
	Game::logic(imageManager, renderer);
	}
	+
	+ // Update max frame per tick.
	+ if (m > 0 && !won) {
	+ Uint64 t2 = SDL_GetPerformanceCounter(), f = SDL_GetPerformanceFrequency();
	+
	+ // second per game frame.
	+ double t = std::max(double(t2 - t1) / double(f) / double(m), 1e-5);
	+
	+ // update max frame per tick smoothly.
	+ maxFramePerTick = (maxFramePerTick * 7 + std::max(int(0.1 / t), 16)) / 8;
	+ }
	}

	void RecordPlayback::checkSaveLoadState() {
	assert(time > 0 && eventQueue.empty());

	if (loadThisNextTime) {
	player.loadStateInternal(&loadThisNextTime->playerSaved);
	shadow.loadStateInternal(&loadThisNextTime->shadowSaved);
	loadGameOnlyStateInternal(&loadThisNextTime->gameSaved);

	player.playRecord(time - 1); //???
	shadow.playRecord(); //???

	won = false;
	- } else {
	- bool isKeyframe = (time % 40) == 0;
	- if ((isKeyframe \|\| saveStateNextTime) && cachedFrames.find(time) == cachedFrames.end()) {
	- if (!isKeyframe) {
	- if ((int)recentFrames.size() >= MAX_RECENT_FRAMES) {
	- auto it = cachedFrames.find(recentFrames.front());
	- if (it != cachedFrames.end()) cachedFrames.erase(it);
	- recentFrames.pop();
	- }
	- recentFrames.push(time);
	- }
	-
	- GameSaveState &state = cachedFrames[time];
	- player.saveStateInternal(&state.playerSaved);
	- shadow.saveStateInternal(&state.shadowSaved);
	- saveGameOnlyStateInternal(&state.gameSaved);
	- }
	+ } else if (auto state = cachedFrames->getSaveState(time, saveStateNextTime && ((time % SAVE_REGULAR_FRAME_PER_TICK) == 0))) {
	+ player.saveStateInternal(&state->playerSaved);
	+ shadow.saveStateInternal(&state->shadowSaved);
	+ saveGameOnlyStateInternal(&state->gameSaved);
	}

	loadThisNextTime = NULL;
	saveStateNextTime = false;
	}

	void RecordPlayback::render(ImageManager& imageManager, SDL_Renderer& renderer) {
	// First let Game render.
	Game::render(imageManager, renderer);

	const SDL_Rect r = { 100, SCREEN_HEIGHT - 144, SCREEN_WIDTH - 200, 72 };
	SDL_Point p;

	// Check if mouse moves (FIXME: logic in render function)
	SDL_GetMouseState(&p.x, &p.y);
	if (lastMouseX != p.x \|\| lastMouseY != p.y \|\| SDL_PointInRect(&p, &r)) {
	lastMouseX = p.x;
	lastMouseY = p.y;
	mouseIdleTime = -MAX_MOUSE_IDLE_TIME;
	}

	// Now render the playback control.
	if (mouseIdleTime < 0) {
	std::string newToolTip;
	SDL_Rect toolTipRect = {};

	const SDL_Color fg = objThemes.getTextColor(true);
	const int alpha = std::max(mouseIdleTime, -15) * (-17);
	const int alpha2 = std::max(mouseIdleTime, -15) * (-10);

	drawGUIBox(r.x, r.y, r.w, r.h, renderer, 0xFFFFFF00 \| alpha2, true);

	int y = r.y + 8;
	const int maxTime = player.getRecord()->size();
	const int tmp = time ^ (maxTime << 16) ^ 42;

	// Draw time text. FIXME: here we screwed up Game::timeTexture.
	if (timeTexture.needsUpdate(tmp)) {
	timeTexture.update(tmp, textureUniqueFromSurface(renderer, SurfacePtr(TTF_RenderUTF8_Blended(fontMono,
	tfm::format("%02d:%05.2f / %02d:%05.2f", time / 2400, (time % 2400) / 40.0, maxTime / 2400, (maxTime % 2400) / 40.0).c_str(),
	fg))));
	}
	SDL_SetTextureAlphaMod(timeTexture.get(), (Uint8)alpha);
	applyTexture(r.x + 8, y, *timeTexture.get(), renderer);
	y += 16;

	// Get the tool tip text of slider if mouse is over
	if (p.y >= y && p.y < y + 24 && p.x >= r.x + 8 && p.x < r.x + r.w - 8) {
	int x = p.x - r.x - 12;
	if (x < 0) x = 0; else if (x > r.w - 24) x = r.w - 24;
	toolTipRect = SDL_Rect{ r.x + x + 8, y, 8, -1 };

	int t = int(float(x) * float(maxTime) / float(r.w - 24) + 0.5f);
	if (t < 0) t = 0; else if (t > maxTime) t = maxTime;
	newToolTip = tfm::format("%02d:%05.2f", t / 2400, (t % 2400) / 40.0);
	}

	// Draw slider.
	int pos = maxTime > 0 ? int(float(r.w - 24) * float(std::min(time, maxTime)) / float(maxTime) + 0.5f) : 0;
	drawGUIBox(r.x + 8, y + 6, pos + 2, 4, renderer, 0x80808000 \| alpha, true);
	drawGUIBox(r.x + pos + 14, y + 6, r.w - pos - 22, 4, renderer, 0xFFFFFF00 \| alpha, true);
	drawGUIBox(r.x + pos + 8, y, 8, 16, renderer, 0xFFFFFF00 \| alpha, true);
	y += 16;

	// Get the tool tip text of buttons if mouse is over
	if (p.y >= y && p.y < y + 24) {
	if (p.x < r.x + 8){
	} else if (p.x < r.x + 32) {
	newToolTip = _("Restart");
	newToolTip += " (" + InputManagerKeyCode::describeTwo(inputMgr.getKeyCode(INPUTMGR_RESTART, false), inputMgr.getKeyCode(INPUTMGR_RESTART, true)) + ")";
	toolTipRect = SDL_Rect{ r.x + 8, y, 24, 24 };
	} else if (p.x < r.x + 56) {
	newToolTip = _("Rewind");
	newToolTip += " (" + InputManagerKeyCode::describeTwo(inputMgr.getKeyCode(INPUTMGR_LEFT, false), inputMgr.getKeyCode(INPUTMGR_LEFT, true)) + ")";
	toolTipRect = SDL_Rect{ r.x + 32, y, 24, 24 };
	} else if (p.x < r.x + 80) {
	newToolTip = _("Step back");
	newToolTip += " (" + InputManagerKeyCode::describeTwo(inputMgr.getKeyCode(INPUTMGR_PREVIOUS, false), inputMgr.getKeyCode(INPUTMGR_PREVIOUS, true)) + ")";
	toolTipRect = SDL_Rect{ r.x + 56, y, 24, 24 };
	} else if (p.x < r.x + 104) {
	newToolTip = replayPaused ? _("Play") : _("Pause");
	newToolTip += " (" + InputManagerKeyCode::describeTwo(inputMgr.getKeyCode(INPUTMGR_SPACE, false), inputMgr.getKeyCode(INPUTMGR_SPACE, true)) + ")";
	toolTipRect = SDL_Rect{ r.x + 80, y, 24, 24 };
	} else if (p.x < r.x + 128) {
	newToolTip = _("Step forward");
	newToolTip += " (" + InputManagerKeyCode::describeTwo(inputMgr.getKeyCode(INPUTMGR_NEXT, false), inputMgr.getKeyCode(INPUTMGR_NEXT, true)) + ")";
	toolTipRect = SDL_Rect{ r.x + 104, y, 24, 24 };
	} else if (p.x < r.x + 152) {
	newToolTip = _("Fast forward");
	newToolTip += " (" + InputManagerKeyCode::describeTwo(inputMgr.getKeyCode(INPUTMGR_RIGHT, false), inputMgr.getKeyCode(INPUTMGR_RIGHT, true)) + ")";
	toolTipRect = SDL_Rect{ r.x + 128, y, 24, 24 };
	} else if (p.x < r.x + r.w - 104) {
	} else if (p.x < r.x + r.w - 80) {
	newToolTip = _("Slower");
	newToolTip += " (" + InputManagerKeyCode::describeTwo(inputMgr.getKeyCode(INPUTMGR_UP, false), inputMgr.getKeyCode(INPUTMGR_UP, true)) + ")";
	toolTipRect = SDL_Rect{ r.x + r.w - 104, y, 24, 24 };
	} else if (p.x < r.x + r.w - 32) {
	} else if (p.x < r.x + r.w - 8) {
	newToolTip = _("Faster");
	newToolTip += " (" + InputManagerKeyCode::describeTwo(inputMgr.getKeyCode(INPUTMGR_DOWN, false), inputMgr.getKeyCode(INPUTMGR_DOWN, true)) + ")";
	toolTipRect = SDL_Rect{ r.x + r.w - 32, y, 24, 24 };
	}

	if (toolTipRect.h > 0) {
	drawGUIBox(toolTipRect.x, toolTipRect.y, toolTipRect.w, toolTipRect.h, renderer, 0xFFFFFF00 \| alpha, true);
	}
	}

	// Set the alpha of gui texture
	SDL_SetTextureAlphaMod(guiTexture.get(), (Uint8)alpha);

	// Draw buttons.
	SDL_Rect srcrect = { 32, 80, 16, 16 };
	SDL_Rect dstrect = { r.x + 12, y + 4, 16, 16 };
	SDL_RenderCopy(&renderer, guiTexture.get(), &srcrect, &dstrect); // restart
	srcrect.x += 16; dstrect.x += 24;
	SDL_RenderCopy(&renderer, guiTexture.get(), &srcrect, &dstrect); // rewind
	srcrect.x += 16; dstrect.x += 24;
	SDL_RenderCopy(&renderer, guiTexture.get(), &srcrect, &dstrect); // previous frame
	srcrect.x = replayPaused ? 96 : 112; srcrect.y = 64; dstrect.x += 24;
	SDL_RenderCopy(&renderer, guiTexture.get(), &srcrect, &dstrect); // play/pause
	srcrect.x = 80; srcrect.y = 80; dstrect.x += 24;
	SDL_RenderCopy(&renderer, guiTexture.get(), &srcrect, &dstrect); // next frame
	srcrect.x += 16; dstrect.x += 24;
	SDL_RenderCopy(&renderer, guiTexture.get(), &srcrect, &dstrect); // fast forward
	srcrect.x = 48; srcrect.y = 80; dstrect.x = r.x + r.w - 100;
	SDL_RenderCopy(&renderer, guiTexture.get(), &srcrect, &dstrect); // slower
	srcrect.x = 96; dstrect.x += 72;
	SDL_RenderCopy(&renderer, guiTexture.get(), &srcrect, &dstrect); // faster

	// Draw replay speed.
	if (replaySpeedTexture.needsUpdate(replaySpeed)) {
	replaySpeedTexture.update(replaySpeed, textureUniqueFromSurface(renderer, SurfacePtr(TTF_RenderUTF8_Blended(fontMono,
	tfm::format("%gx", float(replaySpeed) / 16.0f).c_str(),
	fg))));
	}
	SDL_Rect r1 = rectFromTexture(replaySpeedTexture);
	SDL_SetTextureAlphaMod(replaySpeedTexture.get(), (Uint8)alpha);
	applyTexture(r.x + r.w - 80 + (48 - r1.w) / 2, y + (24 - r1.h) / 2, *replaySpeedTexture.get(), renderer);

	// Reset alpha of gui texture since it is global
	SDL_SetTextureAlphaMod(guiTexture.get(), 255);

	y += 24;

	// Show tool tip if necessary.
	if (!newToolTip.empty()) {
	if (toolTipTexture.needsUpdate(newToolTip)) {
	toolTipTexture.update(newToolTip, textureUniqueFromSurface(renderer, SurfacePtr(TTF_RenderUTF8_Blended(fontText,
	newToolTip.c_str(), fg))));
	}
	SDL_Rect r1 = rectFromTexture(toolTipTexture);
	toolTipRect.y = toolTipRect.y - r1.h - 6;
	toolTipRect.w = r1.w + 4; toolTipRect.h = r1.h + 4;
	if (toolTipRect.x + toolTipRect.w > SCREEN_WIDTH - 2) toolTipRect.x = SCREEN_WIDTH - 2 - toolTipRect.w;

	drawGUIBox(toolTipRect.x, toolTipRect.y, toolTipRect.w, toolTipRect.h, renderer, 0xFFFFFF00 \| alpha, true);

	SDL_SetTextureAlphaMod(toolTipTexture.get(), (Uint8)alpha);
	applyTexture(toolTipRect.x + 2, toolTipRect.y + 2, *toolTipTexture.get(), renderer);
	}
	}

	// Advance the mouse idle time. (FIXME: logic in render function)
	mouseIdleTime++;

	// Render the busy animation.
	if (clickedTime > 0) {
	drawGUIBox(SCREEN_WIDTH / 2 - 25, SCREEN_HEIGHT / 2 - 25, 50, 50, renderer, 0xFFFFFF00 \| 150, true);
	walkingAnimation.draw(renderer, SCREEN_WIDTH / 2 - 11, SCREEN_HEIGHT / 2 - 20);
	walkingAnimation.updateAnimation();
	}

	// Render the replay finished tooltip.
	if (won) {
	// FIXME: here we screwed up Game::bmTipsRestartCheckpoint.
	// This shouldn't cause bugs since when playing from record, the save functionality is disabled.
	if (bmTipsRestartCheckpoint == NULL){
	//Draw string
	bmTipsRestartCheckpoint = textureFromText(renderer, *fontText,
	_("Game replay is done."),
	objThemes.getTextColor(true));
	}

	SDL_Texture* bm = bmTipsRestartCheckpoint.get();

	//Draw the tip.
	if (bm != NULL){
	const SDL_Rect textureSize = rectFromTexture(*bm);
	int x = (SCREEN_WIDTH - textureSize.w) / 2;
	int y = 32;
	drawGUIBox(x - 8, y - 8, textureSize.w + 16, textureSize.h + 14, renderer, 0xFFFFFFFF);
	applyTexture(x, y, *bm, renderer);
	}
	}
	}

	void RecordPlayback::loadRecord(ImageManager& imageManager, SDL_Renderer& renderer, const char* fileName, const char* levelFileName) {
	//Create a TreeStorageNode that will hold the loaded data.
	TreeStorageNode obj;
	{
	POASerializer objSerializer;

	//Parse the file.
	if(!objSerializer.loadNodeFromFile(fileName,&obj,true)){
	cerr<<"ERROR: Can't load record file "<<fileName<<endl;
	return;
	}
	}

	//Load the seed of psuedo-random number generator.
	prngSeed.clear();
	{
	auto it = obj.attributes.find("seed");
	if (it != obj.attributes.end() && !it->second.empty()) {
	prngSeed = it->second[0];
	}
	}

	bool loaded=false;

	//substitute the level if the level file name is specified.
	if (levelFileName) {
	TreeStorageNode *obj = new TreeStorageNode();
	if (!POASerializer().loadNodeFromFile(levelFileName, obj, true)) {
	cerr << "ERROR: Can't load level file " << levelFileName << endl;
	delete obj;
	} else {
	//also replace the script by the external one.
	std::string s = levelFileName;
	size_t lp = s.find_last_of('.');
	if (lp != std::string::npos) {
	s = s.substr(0, lp);
	}
	s += ".lua";

	loadLevelFromNode(imageManager, renderer, obj, "?record?", s);
	loaded = true;
	}
	} else {
	//find the node named 'map'.
	for (unsigned int i = 0; i < obj.subNodes.size(); i++) {
	if (obj.subNodes[i]->name == "map") {
	//load the script from record file.
	std::string s;
	auto it = obj.attributes.find("script");
	if (it != obj.attributes.end() && !it->second.empty()) {
	s = "?" + it->second[0];
	}

	//load the level. (fileName=???)
	loadLevelFromNode(imageManager, renderer, obj.subNodes[i], "?record?", s);
	//remove this node to prevent delete it.
	obj.subNodes[i] = NULL;
	//over
	loaded = true;
	break;
	}
	}
	}

	if(!loaded){
	cerr<<"ERROR: Can't find subnode named 'map' from record file"<<endl;
	return;
	}

	//load the record.
	{
	vector<int> *record=player.getRecord();
	record->clear();
	vector<string> &v=obj.attributes["record"];
	for(unsigned int i=0;i<v.size();i++){
	string &s=v[i];
	string::size_type pos=s.find_first_of('*');
	if(pos==string::npos){
	//1 item only.
	int i=atoi(s.c_str());
	record->push_back(i);
	}else{
	//contains many items.
	int i=atoi(s.substr(0,pos).c_str());
	int j=atoi(s.substr(pos+1).c_str());
	for(;j>0;j--){
	record->push_back(i);
	}
	}
	}
	}

	#ifdef RECORD_FILE_DEBUG
	//load the debug data
	{
	vector<string> &v=obj.attributes["recordPlayerPosition"];
	vector<SDL_Rect> &playerPosition=player.playerPosition();
	playerPosition.clear();
	if(!v.empty()){
	if(!v[0].empty()){
	stringstream st(v[0]);
	int m;
	st>>m;
	for(int i=0;i<m;i++){
	SDL_Rect r;
	st>>r.x>>r.y;
	r.w=0;
	r.h=0;
	playerPosition.push_back(r);
	}
	}
	}
	}
	#endif

	//some sanity check
	assert(eventQueue.empty());

	//play the record.
	player.playRecord();
	shadow.playRecord(); //???

	//Save the game state for time 0.
	- GameSaveState &state = cachedFrames[0];
	- player.saveStateInternal(&state.playerSaved);
	- shadow.saveStateInternal(&state.shadowSaved);
	- saveGameOnlyStateInternal(&state.gameSaved);
	+ GameSaveState *state = cachedFrames->getSaveState(0, false);
	+ player.saveStateInternal(&state->playerSaved);
	+ shadow.saveStateInternal(&state->shadowSaved);
	+ saveGameOnlyStateInternal(&state->gameSaved);

	// We always show the cursor since Game hides it first.
	SDL_ShowCursor(SDL_ENABLE);
	}
	diff --git a/src/RecordPlayback.h b/src/RecordPlayback.h
	index 035dfde..d8fe95c 100644
	--- a/src/RecordPlayback.h
	+++ b/src/RecordPlayback.h
	@@ -1,92 +1,91 @@
	/*
	* Copyright (C) 2019 Me and My Shadow
	*
	* This file is part of Me and My Shadow.
	*
	* Me and My Shadow is free software: you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation, either version 3 of the License, or
	* (at your option) any later version.
	*
	* Me and My Shadow is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with Me and My Shadow. If not, see <http://www.gnu.org/licenses/>.
	*/

	#ifndef RECORDPLAYBACK_H
	#define RECORDPLAYBACK_H

	#include "Game.h"
	#include "ThemeManager.h"

	-#include <map>
	-#include <queue>
	+class FrameCache;

	class RecordPlayback : public Game {
	protected:
	int lastMouseX, lastMouseY, mouseIdleTime;

	// The replay speed. 0x10 means 1.0x, 0x20 means 2.0x, 0x08 means 0.5x, etc.
	int replaySpeed;

	// The replay idle time. When replaySpeed < 0x10 then each time it will be added to replayIdleTime,
	// and when replayIdleTime >= 0x10 the game tick increases.
	int replayIdleTime;

	// Boolean indicating if the replay is paused.
	bool replayPaused;

	//Texture containing the label of the replay speed.
	CachedTexture<int> replaySpeedTexture;

	//Texture containing the tool tip of buttons.
	CachedTexture<std::string> toolTipTexture;

	//Texture of gui.
	SharedTexture guiTexture;

	//The cached frames.
	- std::map<int, GameSaveState> cachedFrames;
	-
	- //The list of recently used frames.
	- std::queue<int> recentFrames;
	+ FrameCache* cachedFrames;

	//The time we are going to jump to. Should be >0, otherwise it will be ignored.
	int clickedTime;

	//The walking animation used when navigating.
	ThemeBlockInstance walkingAnimation;

	//State that is set when we should load it on next logic update.
	GameSaveState *loadThisNextTime;

	+ //Max frame per tick in fast-forward mode. Will be measured dynamically.
	+ int maxFramePerTick;
	+
	//Restart the game from time 0.
	void restart();

	public:
	//Constructor.
	RecordPlayback(SDL_Renderer& renderer, ImageManager& imageManager);

	//Destructor.
	//It will call destroy();
	~RecordPlayback();

	//Inherited from GameState.
	void handleEvents(ImageManager& imageManager, SDL_Renderer& renderer) override;
	void logic(ImageManager& imageManager, SDL_Renderer& renderer) override;
	void render(ImageManager& imageManager, SDL_Renderer& renderer) override;

	//Check if we should save/load state, override it to provide seeking support.
	void checkSaveLoadState() override;

	//Load game record (and its level) from file and play it.
	//fileName: The filename of the recording file.
	//levelFileName: (Optional) The file name of the level file. It's only used when you want to test if the record works for another level.
	void loadRecord(ImageManager& imageManager, SDL_Renderer& renderer, const char* fileName, const char* levelFileName = NULL);
	};

	#endif

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