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Feature: screen preview thumbnail on host double-click

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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
2026-05-07 18:17:28 +02:00
parent 70a6b0128e
commit 566f5b8d42
15 changed files with 785 additions and 22 deletions
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server/2015Remote/stdafx.h
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@@ -101,6 +101,7 @@
#define WM_SHOWNOTIFY WM_USER+3031
#define WM_DISCONNECT WM_USER+3032
#define WM_OPENTERMINALDIALOG WM_USER+3033
#define WM_PREVIEW_RESPONSE WM_USER+3034
#ifdef _UNICODE
#if defined _M_IX86