Release v0.6.8: add background image OCR and optional Tesseract

src/app.cpp

@@ -269,8 +269,15 @@ App::~App()
         std::lock_guard lock(jobsMutex);
         stop = true;
         jobs.clear();
+        pendingHistorySearch = {};
     }
     jobsReady.notify_all();
+    historySearchReady.notify_all();
+    historyOcrReady.notify_all();
+    if (historyOcrWorker.joinable())
+        historyOcrWorker.join();
+    if (historySearchWorker.joinable())
+        historySearchWorker.join();
     if (worker.joinable())
         worker.join();
     RemoveClipboardFormatListener(window);
@@ -291,6 +298,83 @@ void App::enqueue(std::function<void()> job)
     }
     jobsReady.notify_one();
 }
+void App::enqueueHistorySearch(std::function<void()> job)
+{
+    {
+        std::lock_guard lock(jobsMutex);
+        if (stop) return;
+        // Only the latest query matters. Clipboard capture and OCR must not delay it.
+        pendingHistorySearch = std::move(job);
+        if (!historySearchWorker.joinable())
+            historySearchWorker = std::thread([this]
+            {
+                for (;;)
+                {
+                    std::function<void()> searchJob;
+                    {
+                        std::unique_lock lock(jobsMutex);
+                        historySearchReady.wait(lock, [&] { return stop || bool(pendingHistorySearch); });
+                        if (stop) return;
+                        searchJob = std::move(pendingHistorySearch);
+                        pendingHistorySearch = {};
+                    }
+                    try { searchJob(); }
+                    catch (const std::exception &e) { report(wide(e.what())); }
+                }
+            });
+    }
+    historySearchReady.notify_one();
+}
+void App::scheduleHistoryOcr(const Settings &config)
+{
+    {
+        std::lock_guard lock(jobsMutex);
+        if (stop || !history || !config.history) return;
+        historyOcrSettings = config;
+        historyOcrRequested = true;
+        if (!historyOcrWorker.joinable())
+            historyOcrWorker = std::thread([this]
+            {
+                for (;;)
+                {
+                    Settings config;
+                    {
+                        std::unique_lock lock(jobsMutex);
+                        historyOcrReady.wait(lock, [&] { return stop || historyOcrRequested; });
+                        if (stop) return;
+                        historyOcrRequested = false;
+                        config = historyOcrSettings;
+                    }
+                    for (const auto &entry : history->entries())
+                    {
+                        { std::lock_guard lock(jobsMutex); if (stop) return; }
+                        auto profile = ocrProfile(config);
+                        if (!entry.image || (entry.ocrState != 1 && entry.ocrProfile == profile)) continue;
+                        try
+                        {
+                            auto text = recognizeText(history->load(entry.id), config);
+                            std::lock_guard lock(jobsMutex);
+                            if (stop || ocrProfile(historyOcrSettings) != profile) continue;
+                            if (history->saveOcr(entry.id, text, config))
+                                PostMessageW(window, HistoryMessage, 0, 0);
+                        }
+                        catch (const std::exception &e)
+                        {
+                            // Automatic OCR never changes the clipboard or opens error dialogs.
+                            log(L"History OCR: " + wide(e.what()));
+                            try {
+                                std::lock_guard lock(jobsMutex);
+                                if (!stop && ocrProfile(historyOcrSettings) == profile)
+                                    history->saveOcr(entry.id, std::nullopt, config);
+                            }
+                            catch (const std::exception &saveError) { log(L"History OCR save: " + wide(saveError.what())); }
+                        }
+                    }
+                }
+            });
+    }
+    historyOcrReady.notify_one();
+}
 void App::report(const std::wstring &text)
 {
     log(text);
@@ -333,6 +417,7 @@ void App::applySettings(const Settings &s)
 {
     bool autostartChanged = false;
     validateSettings(s);
+    validateTesseract(s);
     if (s.autoCorrect)
     {
         AutoCorrector probe;
@@ -375,6 +460,7 @@ void App::applySettings(const Settings &s)
     }
     // Clear on the worker so the next check reloads edits to dictionary files.
     enqueue([this] { autoCorrector.configure({}, {}); });
+    scheduleHistoryOcr(s);
     SetThreadExecutionState(ES_CONTINUOUS |
                             (settings.awake ? (ES_DISPLAY_REQUIRED | ES_SYSTEM_REQUIRED) : 0));
 }
@@ -1051,6 +1137,7 @@ void App::captureHistory()
                         !f.data[1] && !f.data[2] && !f.data[3])
                         return;
                 history->add(clip, app, config);
+                scheduleHistoryOcr(config);
                 PostMessageW(window, HistoryMessage, 0, 0);
             }
             catch (const std::exception &e)
@@ -1078,7 +1165,9 @@ void App::recognizeEntry(std::wstring id)
             } reset{busy};
             try
             {
-                auto text = recognizeText(history->load(id));
+                auto cached = history->ocrText(id, ocrProfile(config));
+                auto text = cached ? *cached : recognizeText(history->load(id), config);
+                if (!cached) history->saveOcr(id, text, config);
                 if (text.empty())
                 {
                     report(L"No text was found in the image.");
@@ -1442,6 +1531,8 @@ int App::execute()
     if (!keyboardHook || !mouseHook)
         report(L"Input tracking could not start. Automatic recent-text conversion is unavailable.");
     AddClipboardFormatListener(window);
+    // Resume pending OCR, including older images without a saved OCR state.
+    scheduleHistoryOcr(settings);
     addTray();
     SetTimer(window, 1, 60000, nullptr);
     SetThreadExecutionState(ES_CONTINUOUS |