333 lines
9.5 KiB
C++
333 lines
9.5 KiB
C++
#pragma once
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#include "stdafx.h"
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#include <assert.h>
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#include "CursorInfo.h"
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#include "../common/commands.h"
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#define DEFAULT_GOP 0x7FFFFFFF
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#include <vector>
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#include <queue>
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#include <thread>
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#include <mutex>
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#include <condition_variable>
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#include <functional>
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#include <future>
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class ThreadPool {
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public:
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// 构造函数：创建固定数量的线程
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ThreadPool(size_t numThreads) : stop(false) {
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for (size_t i = 0; i < numThreads; ++i) {
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workers.emplace_back([this] {
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while (true) {
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std::function<void()> task;
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{
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std::unique_lock<std::mutex> lock(this->queueMutex);
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this->condition.wait(lock, [this] { return this->stop || !this->tasks.empty(); });
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if (this->stop && this->tasks.empty()) return;
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task = std::move(this->tasks.front());
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this->tasks.pop();
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}
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try {
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task();
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}
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catch (...) {
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// 处理异常
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}
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}
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});
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}
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}
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// 析构函数：销毁线程池
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~ThreadPool() {
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{
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std::unique_lock<std::mutex> lock(queueMutex);
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stop = true;
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}
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condition.notify_all();
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for (std::thread& worker : workers)
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worker.join();
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}
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// 任务提交
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template<typename F>
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auto enqueue(F&& f) -> std::future<decltype(f())> {
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using ReturnType = decltype(f());
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auto task = std::make_shared<std::packaged_task<ReturnType()>>(std::forward<F>(f));
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std::future<ReturnType> res = task->get_future();
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{
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std::unique_lock<std::mutex> lock(queueMutex);
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tasks.emplace([task]() { (*task)(); });
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}
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condition.notify_one();
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return res;
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}
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void waitAll() {
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std::unique_lock<std::mutex> lock(queueMutex);
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condition.wait(lock, [this] { return tasks.empty(); });
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}
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private:
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std::vector<std::thread> workers;
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std::queue<std::function<void()>> tasks;
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std::mutex queueMutex;
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std::condition_variable condition;
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std::atomic<bool> stop;
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};
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class ScreenCapture
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{
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public:
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ThreadPool* m_ThreadPool; // 线程池
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BYTE* m_FirstBuffer; // 上一帧数据
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BYTE* m_RectBuffer; // 当前缓存区
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LPBYTE* m_BlockBuffers; // 分块缓存
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ULONG* m_BlockSizes; // 分块差异像素数
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int m_BlockNum; // 分块个数
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LPBITMAPINFO m_BitmapInfor_Full; // BMP信息
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BYTE m_bAlgorithm; // 屏幕差异算法
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ULONG m_ulFullWidth; // 屏幕宽
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ULONG m_ulFullHeight; // 屏幕高
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bool m_bZoomed; // 屏幕被缩放
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double m_wZoom; // 屏幕横向缩放比
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double m_hZoom; // 屏幕纵向缩放比
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int m_FrameID; // 帧序号
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int m_GOP; // 关键帧间隔
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bool m_SendKeyFrame; // 发送关键帧
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ScreenCapture() : m_ThreadPool(nullptr), m_FirstBuffer(nullptr), m_RectBuffer(nullptr),
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m_BitmapInfor_Full(nullptr), m_bAlgorithm(ALGORITHM_DIFF),
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m_ulFullWidth(0), m_ulFullHeight(0), m_bZoomed(false), m_wZoom(1), m_hZoom(1),
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m_FrameID(0), m_GOP(DEFAULT_GOP), m_SendKeyFrame(false){
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m_BlockNum = 8;
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m_ThreadPool = new ThreadPool(m_BlockNum);
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//::GetSystemMetrics(SM_CXSCREEN/SM_CYSCREEN)获取屏幕大小不准
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//例如当屏幕显示比例为125%时，获取到的屏幕大小需要乘以1.25才对
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DEVMODE devmode;
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memset(&devmode, 0, sizeof(devmode));
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devmode.dmSize = sizeof(DEVMODE);
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devmode.dmDriverExtra = 0;
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BOOL Isgetdisplay = EnumDisplaySettingsA(NULL, ENUM_CURRENT_SETTINGS, &devmode);
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m_ulFullWidth = devmode.dmPelsWidth;
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m_ulFullHeight = devmode.dmPelsHeight;
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int w = GetSystemMetrics(SM_CXSCREEN), h = GetSystemMetrics(SM_CYSCREEN);
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m_bZoomed = (w != m_ulFullWidth) || (h != m_ulFullHeight);
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m_wZoom = double(m_ulFullWidth) / w, m_hZoom = double(m_ulFullHeight) / h;
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Mprintf("=> 桌面缩放比例: %.2f, %.2f\t分辨率：%d x %d\n", m_wZoom, m_hZoom, m_ulFullWidth, m_ulFullHeight);
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m_wZoom = 1.0 / m_wZoom, m_hZoom = 1.0 / m_hZoom;
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m_BlockBuffers = new LPBYTE[m_BlockNum];
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m_BlockSizes = new ULONG[m_BlockNum];
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for (int blockY = 0; blockY < m_BlockNum; ++blockY) {
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m_BlockBuffers[blockY] = new BYTE[m_ulFullWidth * m_ulFullHeight * 4 * 2 / m_BlockNum + 12];
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}
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}
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virtual ~ScreenCapture(){
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if (m_BitmapInfor_Full != NULL) {
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delete[](char*)m_BitmapInfor_Full;
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m_BitmapInfor_Full = NULL;
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}
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SAFE_DELETE_ARRAY(m_RectBuffer);
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for (int blockY = 0; blockY < m_BlockNum; ++blockY) {
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SAFE_DELETE_ARRAY(m_BlockBuffers[blockY]);
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}
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SAFE_DELETE_ARRAY(m_BlockBuffers);
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SAFE_DELETE_ARRAY(m_BlockSizes);
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SAFE_DELETE(m_ThreadPool);
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}
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public:
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//*************************************** 图像差异算法（串行） *************************************
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virtual ULONG CompareBitmap(LPBYTE CompareSourData, LPBYTE CompareDestData, LPBYTE szBuffer,
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DWORD ulCompareLength, BYTE algo, int startPostion = 0) {
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// Windows规定一个扫描行所占的字节数必须是4的倍数, 所以用DWORD比较
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LPDWORD p1 = (LPDWORD)CompareDestData, p2 = (LPDWORD)CompareSourData;
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LPBYTE p = szBuffer;
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ULONG channel = algo == ALGORITHM_GRAY ? 1 : 4;
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ULONG ratio = algo == ALGORITHM_GRAY ? 4 : 1;
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for (ULONG i = 0; i < ulCompareLength; i += 4, ++p1, ++p2) {
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if (*p1 == *p2)
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continue;
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ULONG index = i;
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LPDWORD pos1 = p1++, pos2 = p2++;
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// 计算有几个像素值不同
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for (i += 4; i < ulCompareLength && *p1 != *p2; i += 4, ++p1, ++p2);
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ULONG ulCount = i - index;
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memcpy(pos1, pos2, ulCount); // 更新目标像素
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*(LPDWORD)(p) = index + startPostion;
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*(LPDWORD)(p + sizeof(ULONG)) = ulCount / ratio;
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p += 2 * sizeof(ULONG);
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if (channel != 1) {
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memcpy(p, pos2, ulCount);
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p += ulCount;
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}
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else {
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for (LPBYTE end = p + ulCount / ratio; p < end; p += channel, ++pos2) {
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LPBYTE src = (LPBYTE)pos2;
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*p = (306 * src[2] + 601 * src[0] + 117 * src[1]) >> 10;
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}
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}
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}
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return p - szBuffer;
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}
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//*************************************** 图像差异算法（并行） *************************************
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ULONG MultiCompareBitmap(LPBYTE srcData, LPBYTE dstData, LPBYTE szBuffer,
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DWORD ulCompareLength, BYTE algo) {
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int N = m_BlockNum;
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ULONG blockLength = ulCompareLength / N; // 每个任务的基本字节数
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ULONG remainingLength = ulCompareLength % N; // 剩余的字节数
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std::vector<std::future<ULONG>> futures;
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for (int blockY = 0; blockY < N; ++blockY) {
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// 计算当前任务的字节数
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ULONG currentBlockLength = blockLength + (blockY == N - 1 ? remainingLength : 0);
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// 计算当前任务的起始位置
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ULONG startPosition = blockY * blockLength;
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futures.emplace_back(m_ThreadPool->enqueue([=]() -> ULONG {
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LPBYTE srcBlock = srcData + startPosition;
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LPBYTE dstBlock = dstData + startPosition;
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LPBYTE blockBuffer = m_BlockBuffers[blockY];
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// 处理当前任务并返回比对数据大小
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return m_BlockSizes[blockY] = CompareBitmap(srcBlock, dstBlock, blockBuffer, currentBlockLength, algo, startPosition);
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}));
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}
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// 等待所有任务完成并获取返回值
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for (auto& future : futures) {
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future.get();
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}
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// 合并所有块的差异信息到 szBuffer
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ULONG offset = 0;
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for (int blockY = 0; blockY < N; ++blockY) {
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memcpy(szBuffer + offset, m_BlockBuffers[blockY], m_BlockSizes[blockY]);
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offset += m_BlockSizes[blockY];
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}
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return offset; // 返回缓冲区的大小
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}
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virtual int GetFrameID() const {
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return m_FrameID;
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}
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virtual LPBYTE GetFirstBuffer() const {
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return m_FirstBuffer;
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}
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virtual int GetBMPSize() const {
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assert(m_BitmapInfor_Full);
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return m_BitmapInfor_Full->bmiHeader.biSizeImage;
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}
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// 算法+光标位置+光标类型
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LPBYTE GetNextScreenData(ULONG* ulNextSendLength) {
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BYTE algo = m_bAlgorithm;
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int frameID = m_FrameID + 1;
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bool keyFrame = (frameID % m_GOP == 0);
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m_RectBuffer[0] = keyFrame ? TOKEN_KEYFRAME : TOKEN_NEXTSCREEN;
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LPBYTE data = m_RectBuffer + 1;
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// 写入使用了哪种算法
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memcpy(data, (LPBYTE)&algo, sizeof(BYTE));
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// 写入光标位置
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POINT CursorPos;
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GetCursorPos(&CursorPos);
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CursorPos.x /= m_wZoom;
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CursorPos.y /= m_hZoom;
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memcpy(data + sizeof(BYTE), (LPBYTE)&CursorPos, sizeof(POINT));
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// 写入当前光标类型
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static CCursorInfo m_CursorInfor;
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BYTE bCursorIndex = m_CursorInfor.getCurrentCursorIndex();
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memcpy(data + sizeof(BYTE) + sizeof(POINT), &bCursorIndex, sizeof(BYTE));
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ULONG offset = sizeof(BYTE) + sizeof(POINT) + sizeof(BYTE);
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// 分段扫描全屏幕 将新的位图放入到m_hDiffMemDC中
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LPBYTE nextData = ScanNextScreen();
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if (nullptr == nextData) {
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return nullptr;
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}
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#if SCREENYSPY_IMPROVE
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memcpy(data + offset, &++m_FrameID, sizeof(int));
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offset += sizeof(int);
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#if SCREENSPY_WRITE
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WriteBitmap(m_BitmapInfor_Full, nextData, "GHOST", m_FrameID);
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#endif
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#else
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m_FrameID++;
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#endif
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if (keyFrame)
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{
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*ulNextSendLength = 1 + offset + m_BitmapInfor_Full->bmiHeader.biSizeImage;
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if (algo != ALGORITHM_GRAY)
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{
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memcpy(data + offset, nextData, m_BitmapInfor_Full->bmiHeader.biSizeImage);
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}
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else
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{
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LPBYTE dst = data + offset, src = nextData;
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for (ULONG i = 0; i < m_BitmapInfor_Full->bmiHeader.biSizeImage; i += 4, dst += 4, src += 4) {
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dst[0] = dst[1] = dst[2] = (306 * src[2] + 601 * src[0] + 117 * src[1]) >> 10;
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}
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}
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memcpy(GetFirstBuffer(), nextData, m_BitmapInfor_Full->bmiHeader.biSizeImage);
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}
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else {
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*ulNextSendLength = 1 + offset + MultiCompareBitmap(nextData, GetFirstBuffer(), data + offset, GetBMPSize(), algo);
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}
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return m_RectBuffer;
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}
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// 设置屏幕传输算法
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virtual BYTE SetAlgorithm(int algo) {
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BYTE oldAlgo = m_bAlgorithm;
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m_bAlgorithm = algo;
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return oldAlgo;
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}
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// 鼠标位置转换
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virtual void PointConversion(POINT& pt) const {
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if (m_bZoomed) {
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pt.x *= m_wZoom;
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pt.y *= m_hZoom;
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}
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}
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// 获取位图结构信息
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virtual const LPBITMAPINFO& GetBIData() const {
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return m_BitmapInfor_Full;
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}
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public: // 纯虚接口
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// 获取第一帧屏幕
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virtual LPBYTE GetFirstScreenData(ULONG* ulFirstScreenLength) = 0;
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// 获取下一帧屏幕
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virtual LPBYTE ScanNextScreen() = 0;
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};
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