Add background fontconfig cache updating

When the libass provider is enabled, initialize fontconfig on program
startup rather than waiting for the user to open a video. If the user
tries to open a video while the cache is still being updated, display a
"progress" dialog,

Updates #1115.

Originally committed to SVN as r4768.

aegisub/src/dialog_progress.cpp

@@ -211,4 +211,6 @@ void DialogProgressThread::Close() {
 	dialog->GetEventHandler()->ProcessEvent(event);
 }
 
-
+void DialogProgress::Pulse() {
+	gauge->Pulse();
+}

aegisub/src/dialog_progress.h

@@ -81,6 +81,7 @@ public:
 	void SetProgress(int cur,int max);
 	void SetText(wxString text);
 	void Run();
+	void Pulse();
 
 	DECLARE_EVENT_TABLE()
 };

aegisub/src/subtitles_provider.cpp

@@ -62,6 +62,7 @@ SubtitlesProvider* SubtitlesProviderFactory::GetProvider() {
 			SubtitlesProvider *provider = Create(list[i], subType);
 			if (provider) return provider;
 		}
+		catch (agi::UserCancelException const&) { throw; }
 		catch (wxString err) { error += list[i] + _T(" factory: ") + err + _T("\n"); }
 		catch (const wxChar *err) { error += list[i] + _T(" factory: ") + wxString(err) + _T("\n"); }
 		catch (...) { error += list[i] + _T(" factory: Unknown error\n"); }
@@ -79,6 +80,7 @@ void SubtitlesProviderFactory::RegisterProviders() {
 #endif
 #ifdef WITH_LIBASS
 	Register<LibassSubtitlesProvider>("libass");
+	LibassSubtitlesProvider::CacheFonts();
 #endif
 }
 

aegisub/src/subtitles_provider_libass.cpp

@@ -40,6 +40,7 @@
 
 #ifndef AGI_PRE
 #include <wx/filefn.h>
+#include <wx/utils.h>
 #endif
 
 #ifdef __APPLE__
@@ -50,6 +51,9 @@
 #include <libaegisub/log.h>
 
 #include "ass_file.h"
+#include "dialog_progress.h"
+#include "frame_main.h"
+#include "main.h"
 #include "standard_paths.h"
 #include "subtitles_provider_libass.h"
 #include "utils.h"
@@ -73,33 +77,7 @@ static void msg_callback(int level, const char *fmt, va_list args, void *data) {
 		LOG_D("subtitle/provider/libass") << buf;
 }
 
-/// @brief Constructor
-///
-LibassSubtitlesProvider::LibassSubtitlesProvider(std::string) {
-	// Initialize library
-	static bool first = true;
-	if (first) {
-		ass_library = ass_library_init();
-		if (!ass_library) throw _T("ass_library_init failed");
-
-		wxString fonts_dir = StandardPaths::DecodePath(_T("?user/libass_fonts/"));
-		if (!wxDirExists(fonts_dir))
-			// It's only one level below the user dir, and we assume the user dir already exists at this point.
-			wxMkdir(fonts_dir);
-
-		ass_set_fonts_dir(ass_library, fonts_dir.mb_str(wxConvFile));
-		ass_set_extract_fonts(ass_library, 0);
-		ass_set_style_overrides(ass_library, NULL);
-		ass_set_message_cb(ass_library, msg_callback, this);
-		first = false;
-	}
-
-	// Initialize renderer
-	ass_track = NULL;
-	ass_renderer = ass_renderer_init(ass_library);
-	if (!ass_renderer) throw _T("ass_renderer_init failed");
-	ass_set_font_scale(ass_renderer, 1.);
-
+static void load_config(ASS_Renderer *ass_renderer) {
 #ifdef __APPLE__
 	char config_path[MAXPATHLEN];
 	char *config_dir;
@@ -111,7 +89,32 @@ LibassSubtitlesProvider::LibassSubtitlesProvider(std::string) {
 	const char *config_path = NULL;
 #endif
 
-	ass_set_fonts(ass_renderer, NULL, "Sans", 1, config_path, 1);
+	ass_set_fonts(ass_renderer, NULL, "Sans", 1, config_path, true);
+}
+
+/// @brief Constructor
+///
+LibassSubtitlesProvider::LibassSubtitlesProvider(std::string) {
+	if (cache_worker) {
+		bool canceled;
+		DialogProgress *progress = new DialogProgress(AegisubApp::Get()->frame, L"", &canceled, L"Caching fonts", 0, 1);
+		progress->Show();
+		while (cache_worker) {
+			if (canceled) throw agi::UserCancelException("Font caching cancelled");
+			progress->Pulse();
+			wxYield();
+			wxMilliSleep(100);
+		}
+		progress->Destroy();
+	}
+	ass_set_message_cb(ass_library, msg_callback, this);
+
+	// Initialize renderer
+	ass_track = NULL;
+	ass_renderer = ass_renderer_init(ass_library);
+	if (!ass_renderer) throw _T("ass_renderer_init failed");
+	ass_set_font_scale(ass_renderer, 1.);
+	load_config(ass_renderer);
 }
 
 /// @brief Destructor
@@ -201,7 +204,34 @@ void LibassSubtitlesProvider::DrawSubtitles(AegiVideoFrame &frame,double time) {
 	}
 }
 
+class FontConfigCacheThread : public wxThread {
+	ASS_Library *ass_library;
+	FontConfigCacheThread** thisPtr;
+	ExitCode Entry() {
+		ASS_Renderer *ass_renderer = ass_renderer_init(ass_library);
+		load_config(ass_renderer);
+		ass_renderer_done(ass_renderer);
+		*thisPtr = NULL;
+		return EXIT_SUCCESS;
+	}
+public:
+	FontConfigCacheThread(ASS_Library *ass_library, FontConfigCacheThread **thisPtr)
+		: ass_library(ass_library)
+		, thisPtr(thisPtr)
+	{
+		*thisPtr = this;
+		Create();
+		Run();
+	}
+};
+
+void LibassSubtitlesProvider::CacheFonts() {
+	ass_library = ass_library_init();
+	new FontConfigCacheThread(ass_library, &cache_worker);
+}
+
 /// DOCME
 ASS_Library* LibassSubtitlesProvider::ass_library;
+FontConfigCacheThread* LibassSubtitlesProvider::cache_worker = NULL;
 
 #endif // WITH_LIBASS

aegisub/src/subtitles_provider_libass.h

@@ -45,6 +45,7 @@ extern "C" {
 #include "../libass/ass.h"
 }
 
+class FontConfigCacheThread;
 
 /// DOCME
 /// @class LibassSubtitlesProvider
@@ -61,11 +62,15 @@ class LibassSubtitlesProvider : public SubtitlesProvider {
 	/// DOCME
 	ASS_Track* ass_track;
 
+	static FontConfigCacheThread *cache_worker;
+
 public:
 	LibassSubtitlesProvider(std::string);
 	~LibassSubtitlesProvider();
 
 	void LoadSubtitles(AssFile *subs);
 	void DrawSubtitles(AegiVideoFrame &dst,double time);
+
+	static void CacheFonts();
 };
 #endif