Feature: screen preview thumbnail on host double-click
Server sends COMMAND_SCREEN_PREVIEW_REQ when user double-clicks an active (non-Locked/Inactive) host that advertises CLIENT_CAP_SCREEN_PREVIEW. Client BitBlts primary screen, encodes to JPEG via GDI+ and replies. The existing STATIC tooltip is replaced with a self-drawn CPreviewTipWnd showing the thumbnail above the host info text, with wide-character rendering so the popup also works on non-Chinese servers. - Quality tiers reuse QualityProfile pattern: PreviewProfile + 6 levels driven by GetTargetQualityLevel (FRP-aware), with 4K/ultrawide auto upscale on Ultra/High tiers up to min(screenWidth/4, 1280). - Client limits to 1 in-flight capture via atomic counter to defend against flood/DoS; Send2Server is already mutex-serialized. - Server validates responses by reqId only (single in-flight tip); 4s arrival timeout marks "preview unavailable" without blocking the text fallback path. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
yuanyuanxiang
243
server/2015Remote/PreviewTipWnd.cpp
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243
server/2015Remote/PreviewTipWnd.cpp
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// PreviewTipWnd.cpp
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#include "stdafx.h"
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#include "PreviewTipWnd.h"
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#include <objidl.h> // IUnknown / IStream — gdiplus.h 依赖它们已声明
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#include <gdiplus.h>
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#pragma comment(lib, "gdiplus.lib")
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using namespace Gdiplus;
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namespace {
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constexpr int PADDING = 8;
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constexpr int IMAGE_TEXT_GAP = 6; // 图像与下方文本之间的留白
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constexpr int MIN_TEXT_W = 360;
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constexpr int MAX_TEXT_W = 720; // 文本可换行宽度上限（垂直布局，宽度不再受图像挤压）
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constexpr int MAX_IMAGE_W = 960; // 显示上限（防止 LAN 档 1280 的 JPEG 把窗口顶到屏幕外）
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constexpr int LOADING_W = 480; // 占位的最小宽度（图像未到达时）
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constexpr int LOADING_H = 270;
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} // namespace
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BEGIN_MESSAGE_MAP(CPreviewTipWnd, CWnd)
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ON_WM_PAINT()
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ON_WM_ERASEBKGND()
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END_MESSAGE_MAP()
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CPreviewTipWnd::CPreviewTipWnd() = default;
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CPreviewTipWnd::~CPreviewTipWnd()
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{
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// m_image 通过 unique_ptr 自动释放
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}
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BOOL CPreviewTipWnd::Create(CWnd* pParent, CPoint anchor, const CStringW& text, int imageReserveW)
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{
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m_text = text;
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m_imageReserveW = imageReserveW > 0 ? min(imageReserveW, MAX_IMAGE_W) : 0;
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m_imageReserveH = m_imageReserveW > 0 ? (m_imageReserveW * 9 / 16) : 0;
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if (m_imageReserveW > 0 && m_imageReserveW < LOADING_W) {
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m_imageReserveW = LOADING_W;
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m_imageReserveH = LOADING_H;
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}
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// 创建字体（项目是 MBCS，但浮窗用宽字符；显式 LOGFONTW + W 版 API 避免编码混淆）
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LOGFONTW lf = {};
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HFONT hSysFont = (HFONT)::GetStockObject(DEFAULT_GUI_FONT);
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if (hSysFont && ::GetObjectW(hSysFont, sizeof(lf), &lf) == 0) {
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hSysFont = nullptr;
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}
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if (!hSysFont) {
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lf.lfHeight = -12;
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wcscpy_s(lf.lfFaceName, L"Microsoft YaHei");
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}
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HFONT hF = ::CreateFontIndirectW(&lf);
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if (hF) m_font.Attach(hF);
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// 注册自绘窗口类：用 MFC 的 AfxRegisterWndClass 确保和 MFC 子类化机制兼容
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LPCTSTR kClass = AfxRegisterWndClass(
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CS_SAVEBITS,
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::LoadCursor(NULL, IDC_ARROW),
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(HBRUSH)(COLOR_INFOBK + 1),
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NULL);
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// 临时尺寸；RecalcLayoutAndResize 会在创建后调整
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CRect rc(anchor.x, anchor.y, anchor.x + 400, anchor.y + 200);
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BOOL bOk = CWnd::CreateEx(
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WS_EX_TOPMOST | WS_EX_TOOLWINDOW | WS_EX_NOACTIVATE,
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kClass, _T(""),
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WS_POPUP | WS_BORDER,
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rc, pParent, 0);
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if (!bOk) return FALSE;
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RecalcLayoutAndResize();
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ShowWindow(SW_SHOWNOACTIVATE);
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return TRUE;
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}
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void CPreviewTipWnd::SetImageFromJpeg(const BYTE* data, size_t bytes)
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{
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if (!data || bytes == 0) return;
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HGLOBAL hMem = ::GlobalAlloc(GMEM_MOVEABLE, bytes);
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if (!hMem) return;
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void* p = ::GlobalLock(hMem);
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if (!p) { ::GlobalFree(hMem); return; }
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memcpy(p, data, bytes);
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::GlobalUnlock(hMem);
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IStream* stream = nullptr;
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if (FAILED(::CreateStreamOnHGlobal(hMem, TRUE, &stream))) {
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::GlobalFree(hMem);
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return;
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}
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std::unique_ptr<Bitmap> bmp(new Bitmap(stream, FALSE));
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stream->Release(); // CreateStreamOnHGlobal(..., TRUE) 释放 stream 时会释放 hMem
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if (!bmp || bmp->GetLastStatus() != Ok) {
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return;
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}
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m_image = std::move(bmp);
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m_hasImage = true;
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m_unavailable = false;
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RecalcLayoutAndResize();
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if (GetSafeHwnd()) Invalidate();
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}
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void CPreviewTipWnd::MarkPreviewUnavailable()
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{
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if (m_hasImage) return; // 已经有图就不再覆盖
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m_unavailable = true;
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if (GetSafeHwnd()) Invalidate();
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}
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void CPreviewTipWnd::RecalcLayoutAndResize()
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{
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HWND hWnd = GetSafeHwnd();
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if (!hWnd) return;
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// 估算图像尺寸（先算图像，因为文本宽度要参考图像宽度对齐）
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if (m_image) {
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int iw = (int)m_image->GetWidth();
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int ih = (int)m_image->GetHeight();
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if (iw > MAX_IMAGE_W) {
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ih = (int)((double)ih * MAX_IMAGE_W / iw + 0.5);
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iw = MAX_IMAGE_W;
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}
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m_imageDrawW = iw;
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m_imageDrawH = ih;
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} else {
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m_imageDrawW = m_imageReserveW;
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m_imageDrawH = m_imageReserveH;
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}
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// 文本换行宽度：与图像同宽（让文本视觉上对齐到图像下方），但不超过 MAX_TEXT_W
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// 没有图像时退化到 MAX_TEXT_W
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int textWrapW = m_imageDrawW > 0 ? min((int)MAX_TEXT_W, m_imageDrawW) : (int)MAX_TEXT_W;
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if (textWrapW < MIN_TEXT_W) textWrapW = MIN_TEXT_W;
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// 估算文本尺寸（项目是 MBCS，但浮窗文本是宽字符，必须显式调用 W 版本）
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CClientDC dc(this);
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CFont* old = dc.SelectObject(&m_font);
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CRect rcText(0, 0, textWrapW, 32767);
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::DrawTextW(dc.GetSafeHdc(), m_text, m_text.GetLength(), &rcText,
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DT_CALCRECT | DT_LEFT | DT_WORDBREAK | DT_NOPREFIX);
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m_textW = max((int)MIN_TEXT_W, rcText.Width());
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if (m_imageDrawW > 0) m_textW = max(m_textW, m_imageDrawW); // 至少与图像同宽
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m_textH = rcText.Height();
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dc.SelectObject(old);
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int contentW = max(m_imageDrawW, m_textW);
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int gap = (m_imageDrawW > 0 && m_textH > 0) ? IMAGE_TEXT_GAP : 0;
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int totalW = PADDING + contentW + PADDING;
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int totalH = PADDING + m_imageDrawH + gap + m_textH + PADDING;
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// 当前左上角
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CRect rc;
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GetWindowRect(&rc);
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int newX = rc.left;
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int newY = rc.top;
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// 防止越出屏幕：右下夹紧到工作区
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HMONITOR hMon = MonitorFromPoint(CPoint(newX, newY), MONITOR_DEFAULTTONEAREST);
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MONITORINFO mi = { sizeof(mi) };
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if (hMon && GetMonitorInfo(hMon, &mi)) {
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if (newX + totalW > mi.rcWork.right) newX = max((int)mi.rcWork.left, mi.rcWork.right - totalW);
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if (newY + totalH > mi.rcWork.bottom) newY = max((int)mi.rcWork.top, mi.rcWork.bottom - totalH);
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}
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SetWindowPos(NULL, newX, newY, totalW, totalH, SWP_NOZORDER | SWP_NOACTIVATE);
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}
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BOOL CPreviewTipWnd::OnEraseBkgnd(CDC* /*pDC*/)
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{
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return TRUE; // 在 OnPaint 里整体填充
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}
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void CPreviewTipWnd::OnPaint()
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{
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CPaintDC pdc(this);
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CRect rcClient;
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GetClientRect(&rcClient);
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// 双缓冲
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CDC memDC;
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memDC.CreateCompatibleDC(&pdc);
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CBitmap memBmp;
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memBmp.CreateCompatibleBitmap(&pdc, rcClient.Width(), rcClient.Height());
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CBitmap* oldBmp = memDC.SelectObject(&memBmp);
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memDC.FillSolidRect(&rcClient, ::GetSysColor(COLOR_INFOBK));
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CFont* oldFont = memDC.SelectObject(&m_font);
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memDC.SetTextColor(::GetSysColor(COLOR_INFOTEXT));
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memDC.SetBkMode(TRANSPARENT);
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int curY = PADDING;
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if (m_imageDrawW > 0 && m_imageDrawH > 0) {
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CRect rcImg(PADDING, curY, PADDING + m_imageDrawW, curY + m_imageDrawH);
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DrawImageArea(memDC, rcImg);
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curY += m_imageDrawH + IMAGE_TEXT_GAP;
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}
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CRect rcText(PADDING, curY, PADDING + m_textW, curY + m_textH);
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DrawTextArea(memDC, rcText);
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memDC.SelectObject(oldFont);
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pdc.BitBlt(0, 0, rcClient.Width(), rcClient.Height(), &memDC, 0, 0, SRCCOPY);
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memDC.SelectObject(oldBmp);
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}
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void CPreviewTipWnd::DrawImageArea(CDC& dc, const CRect& rc)
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{
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// 边框
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dc.Draw3dRect(&rc, ::GetSysColor(COLOR_3DSHADOW), ::GetSysColor(COLOR_3DSHADOW));
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if (m_hasImage && m_image) {
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Graphics g(dc.GetSafeHdc());
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g.SetInterpolationMode(InterpolationModeHighQualityBicubic);
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g.SetSmoothingMode(SmoothingModeHighQuality);
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g.DrawImage(m_image.get(), rc.left + 1, rc.top + 1, rc.Width() - 2, rc.Height() - 2);
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} else {
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// 占位灰色背景
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CRect rcInner = rc;
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rcInner.DeflateRect(1, 1);
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dc.FillSolidRect(&rcInner, RGB(245, 245, 245));
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const wchar_t* placeholder = m_unavailable ? L"Preview Unavailable" : L"Loading Preview ...";
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UINT fmt = DT_CENTER | DT_VCENTER | DT_SINGLELINE | DT_NOPREFIX;
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dc.SetTextColor(m_unavailable ? RGB(160, 80, 80) : RGB(120, 120, 120));
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RECT rcInnerRaw = rcInner;
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::DrawTextW(dc.GetSafeHdc(), placeholder, -1, &rcInnerRaw, fmt);
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dc.SetTextColor(::GetSysColor(COLOR_INFOTEXT));
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}
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}
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void CPreviewTipWnd::DrawTextArea(CDC& dc, const CRect& rc)
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{
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RECT r = rc;
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::DrawTextW(dc.GetSafeHdc(), m_text, m_text.GetLength(), &r,
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DT_LEFT | DT_TOP | DT_WORDBREAK | DT_NOPREFIX);
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}
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