Release v0.6.57: multi-PC input, shared clipboard and resilient Settings Save

src/lan_clipboard_image.h

@@ -0,0 +1,25 @@
+#pragma once
+#include "ocr.h"
+#include <algorithm>
+namespace ks::lan
+{
+// Send one lossless image, not PNG plus multiple uncompressed DIB copies.
+inline Clip compactClipboardImage(Clip clip)
+{
+    auto png=std::find_if(clip.formats.begin(),clip.formats.end(),[](const Format &f){return f.name==L"PNG";});
+    bool image=png!=clip.formats.end()||std::any_of(clip.formats.begin(),clip.formats.end(),[](const Format &f){return f.id==CF_DIB||f.id==CF_DIBV5;});
+    if(!image)return clip;
+    Bytes bytes=png!=clip.formats.end()?png->data:encodePng(decodeImage(clip));
+    std::erase_if(clip.formats,[](const Format &f){return f.id==CF_DIB||f.id==CF_DIBV5||f.name==L"PNG";});
+    clip.formats.push_back({RegisterClipboardFormatW(L"PNG"),L"PNG",std::move(bytes)});
+    return clip;
+}
+// Older applications paste DIB rather than PNG; expand only at the destination.
+inline Clip clipboardImageForPaste(Clip clip)
+{
+    bool dib=false,png=false;
+    for(const auto &f:clip.formats){dib|=f.id==CF_DIB||f.id==CF_DIBV5;png|=f.name==L"PNG";}
+    if(png&&!dib)clip.formats.push_back(imageDib(decodeImage(clip)));
+    return clip;
+}
+}