// Name: app.cpp
// Purpose:
// Author: Robert Roebling
-// Created: 01/02/97
-// Id:
-// Copyright: (c) 1998 Robert Roebling, Julian Smart and Markus Holzem
-// Licence: wxWindows licence
+// Id: $Id$
+// Copyright: (c) 1998 Robert Roebling, Julian Smart
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifdef __GNUG__
-#pragma implementation "app.h"
+ #pragma implementation "app.h"
#endif
#include "wx/app.h"
#include "wx/gdicmn.h"
#include "wx/utils.h"
-#include "wx/postscrp.h"
#include "wx/intl.h"
#include "wx/log.h"
#include "wx/memory.h"
#include "wx/font.h"
#include "wx/settings.h"
-#include "wx/resource.h"
+#include "wx/dialog.h"
+
+#if wxUSE_WX_RESOURCES
+ #include "wx/resource.h"
+#endif
+
+#include "wx/module.h"
+#include "wx/image.h"
+
+#include "wx/thread.h"
#include "unistd.h"
-#ifdef wxUSE_GDK_IMLIB
-#include "../gdk_imlib/gdk_imlib.h"
-#endif
+#include <glib.h>
+#include <gdk/gdk.h>
+#include <gtk/gtk.h>
+
+#include "wx/gtk/win_gtk.h"
//-----------------------------------------------------------------------------
// global data
wxAppInitializerFunction wxApp::m_appInitFn = (wxAppInitializerFunction) NULL;
extern wxList wxPendingDelete;
+#if wxUSE_THREADS
+extern wxList wxPendingEvents;
+extern wxCriticalSection wxPendingEventsLocker;
+#endif
extern wxResourceCache *wxTheResourceCache;
+unsigned char g_palette[64*3] =
+{
+ 0x0, 0x0, 0x0,
+ 0xff, 0xff, 0xff,
+ 0xff, 0x0, 0x0,
+ 0xff, 0xff, 0x0,
+ 0x0, 0xff, 0x0,
+ 0x0, 0x0, 0xff,
+ 0x0, 0xff, 0xff,
+ 0x99, 0x99, 0x99,
+ 0xff, 0x88, 0x0,
+ 0x88, 0x0, 0x0,
+ 0x0, 0x88, 0x88,
+ 0x88, 0x88, 0x0,
+ 0xff, 0xcc, 0x97,
+ 0xbb, 0xbb, 0xbb,
+ 0x9f, 0x6b, 0x42,
+ 0x55, 0x55, 0x55,
+ 0xdd, 0xdd, 0xdd,
+ 0x77, 0x77, 0x77,
+ 0x33, 0x33, 0x33,
+ 0xcc, 0x0, 0x0,
+ 0xff, 0x44, 0x0,
+ 0xff, 0xcc, 0x0,
+ 0xcc, 0xcc, 0x0,
+ 0x60, 0x60, 0x0,
+ 0x0, 0x43, 0x0,
+ 0x0, 0x7f, 0x0,
+ 0x0, 0xcc, 0x0,
+ 0x0, 0x44, 0x44,
+ 0x0, 0x0, 0x44,
+ 0x0, 0x0, 0x88,
+ 0xef, 0xb1, 0x7b,
+ 0xdf, 0x98, 0x5f,
+ 0xbf, 0x87, 0x56,
+ 0x7f, 0x57, 0x26,
+ 0x5f, 0x39, 0xc,
+ 0x3f, 0x1c, 0x0,
+ 0x21, 0x0, 0x0,
+ 0x0, 0x43, 0x87,
+ 0x2d, 0x70, 0xaf,
+ 0x5a, 0x9e, 0xd7,
+ 0x87, 0xcc, 0xff,
+ 0xff, 0xe0, 0xba,
+ 0x21, 0x43, 0xf,
+ 0x3d, 0x5d, 0x25,
+ 0x59, 0x78, 0x3a,
+ 0x75, 0x93, 0x4f,
+ 0x91, 0xae, 0x64,
+ 0xad, 0xc8, 0x7a,
+ 0xf0, 0xa8, 0xef,
+ 0xd0, 0x88, 0xd0,
+ 0xaf, 0x66, 0xaf,
+ 0x8e, 0x44, 0x8e,
+ 0x6d, 0x22, 0x6d,
+ 0x4b, 0x0, 0x4b,
+ 0xff, 0xc0, 0xbc,
+ 0xff, 0x93, 0x91,
+ 0xff, 0x66, 0x67,
+ 0xd8, 0xf2, 0xbf,
+ 0xff, 0xc9, 0x68,
+ 0xff, 0x96, 0x67,
+ 0xa5, 0x60, 0xff,
+ 0x51, 0xff, 0x99,
+ 0x3f, 0xa5, 0x63,
+ 0x98, 0x90, 0x67
+};
+
//-----------------------------------------------------------------------------
// local functions
//-----------------------------------------------------------------------------
// global functions
//-----------------------------------------------------------------------------
-void wxExit(void)
+void wxExit()
{
- gtk_main_quit();
+ gtk_main_quit();
}
-bool wxYield(void)
+bool wxYield()
{
- while (gtk_events_pending() > 0) gtk_main_iteration();
- return TRUE;
+ // it's necessary to call ProcessIdle() to update the frames sizes which
+ // might have been changed (it also will update other things set from
+ // OnUpdateUI() which is a nice (and desired) side effect)
+ for ( wxNode *node = wxTopLevelWindows.GetFirst();
+ node;
+ node = node->GetNext() )
+ {
+ wxWindow *win = ((wxWindow*)node->GetData());
+ win->OnInternalIdle();
+ }
+
+ while (gtk_events_pending() > 0)
+ gtk_main_iteration();
+
+ return TRUE;
}
//-----------------------------------------------------------------------------
gint wxapp_idle_callback( gpointer WXUNUSED(data) )
{
- if (wxTheApp) while (wxTheApp->ProcessIdle()) {}
- usleep( 10000 );
- return TRUE;
+ if (wxTheApp)
+ {
+ while (wxTheApp->ProcessIdle())
+ {
+ }
+ }
+
+ wxMutexGuiLeave();
+ wxUsleep(10);
+ wxMutexGuiEnter();
+
+ return TRUE;
}
wxApp::wxApp()
{
- m_idleTag = 0;
- m_topWindow = (wxWindow *) NULL;
- m_exitOnFrameDelete = TRUE;
- wxTheApp = this;
-}
+ wxTheApp = this;
-wxApp::~wxApp(void)
-{
- gtk_idle_remove( m_idleTag );
-}
+ m_topWindow = (wxWindow *) NULL;
+ m_exitOnFrameDelete = TRUE;
-bool wxApp::OnInit(void)
-{
- return TRUE;
+ m_idleTag = gtk_idle_add( wxapp_idle_callback, (gpointer) NULL );
+
+ m_colorCube = (unsigned char*) NULL;
}
-bool wxApp::OnInitGui(void)
+wxApp::~wxApp()
{
- m_idleTag = gtk_idle_add( wxapp_idle_callback, NULL );
- return TRUE;
+ gtk_idle_remove( m_idleTag );
+
+ if (m_colorCube) free(m_colorCube);
}
-int wxApp::OnRun(void)
+bool wxApp::OnInitGui()
{
- return MainLoop();
+ /* Nothing to do for 15, 16, 24, 32 bit displays */
+
+ GdkVisual *visual = gdk_visual_get_system();
+ if (visual->depth > 8) return TRUE;
+
+ /* this initiates the standard palette as defined by GdkImlib
+ in the GNOME libraries. it ensures that all GNOME applications
+ use the same 64 colormap entries on 8-bit displays so you
+ can use several rather graphics-heavy applications at the
+ same time.
+ NOTE: this doesn't really seem to work this way... */
+
+ /*
+ GdkColormap *cmap = gdk_colormap_new( gdk_visual_get_system(), TRUE );
+
+ for (int i = 0; i < 64; i++)
+ {
+ GdkColor col;
+ col.red = g_palette[i*3 + 0] << 8;
+ col.green = g_palette[i*3 + 1] << 8;
+ col.blue = g_palette[i*3 + 2] << 8;
+ col.pixel = 0;
+
+ gdk_color_alloc( cmap, &col );
+ }
+
+ gtk_widget_set_default_colormap( cmap );
+ */
+
+ /* initialize color cube for 8-bit color reduction dithering */
+
+ GdkColormap *cmap = gtk_widget_get_default_colormap();
+
+ m_colorCube = (unsigned char*)malloc(32 * 32 * 32);
+
+ for (int r = 0; r < 32; r++)
+ {
+ for (int g = 0; g < 32; g++)
+ {
+ for (int b = 0; b < 32; b++)
+ {
+ int rr = (r << 3) | (r >> 2);
+ int gg = (g << 3) | (g >> 2);
+ int bb = (b << 3) | (b >> 2);
+
+ GdkColor *colors = cmap->colors;
+ int max = 3 * (65536);
+ int index = -1;
+
+ for (int i = 0; i < cmap->size; i++)
+ {
+ int rdiff = ((rr << 8) - colors[i].red);
+ int gdiff = ((gg << 8)- colors[i].green);
+ int bdiff = ((bb << 8)- colors[i].blue);
+ int sum = ABS (rdiff) + ABS (gdiff) + ABS (bdiff);
+ if (sum < max) { index = i; max = sum; }
+ }
+
+ m_colorCube[ (r*1024) + (g*32) + b ] = index;
+ }
+ }
+ }
+
+
+ return TRUE;
}
-bool wxApp::ProcessIdle(void)
+bool wxApp::ProcessIdle()
{
- wxIdleEvent event;
- event.SetEventObject( this );
- ProcessEvent( event );
+ wxIdleEvent event;
+ event.SetEventObject( this );
+ ProcessEvent( event );
- return event.MoreRequested();
+ return event.MoreRequested();
}
void wxApp::OnIdle( wxIdleEvent &event )
{
- static bool inOnIdle = FALSE;
+ static bool inOnIdle = FALSE;
- // Avoid recursion (via ProcessEvent default case)
- if (inOnIdle)
- return;
+ /* Avoid recursion (via ProcessEvent default case) */
+ if (inOnIdle)
+ return;
- inOnIdle = TRUE;
+ inOnIdle = TRUE;
- // 'Garbage' collection of windows deleted with Close().
- DeletePendingObjects();
+ /* Resend in the main thread events which have been prepared in other
+ threads */
+ ProcessPendingEvents();
- // flush the logged messages if any
- wxLog *pLog = wxLog::GetActiveTarget();
- if ( pLog != NULL && pLog->HasPendingMessages() )
- pLog->Flush();
+ /* 'Garbage' collection of windows deleted with Close(). */
+ DeletePendingObjects();
- // Send OnIdle events to all windows
- bool needMore = SendIdleEvents();
+ /* flush the logged messages if any */
+ wxLog *log = wxLog::GetActiveTarget();
+ if (log != NULL && log->HasPendingMessages())
+ log->Flush();
- if (needMore)
- event.RequestMore(TRUE);
+ /* Send OnIdle events to all windows */
+ bool needMore = SendIdleEvents();
- inOnIdle = FALSE;
+ if (needMore)
+ event.RequestMore(TRUE);
+
+ inOnIdle = FALSE;
}
-bool wxApp::SendIdleEvents(void)
+bool wxApp::SendIdleEvents()
{
bool needMore = FALSE;
- wxNode* node = wxTopLevelWindows.First();
- while (node)
- {
- wxWindow* win = (wxWindow*) node->Data();
- if (SendIdleEvents(win))
- needMore = TRUE;
- node = node->Next();
- }
+ wxNode* node = wxTopLevelWindows.First();
+ while (node)
+ {
+ wxWindow* win = (wxWindow*) node->Data();
+ if (SendIdleEvents(win))
+ needMore = TRUE;
+ node = node->Next();
+ }
return needMore;
}
{
bool needMore = FALSE;
- wxIdleEvent event;
- event.SetEventObject(win);
- win->ProcessEvent(event);
+ wxIdleEvent event;
+ event.SetEventObject(win);
+
+ win->OnInternalIdle();
+
+ win->ProcessEvent(event);
if (event.MoreRequested())
needMore = TRUE;
- wxNode* node = win->GetChildren()->First();
- while (node)
- {
- wxWindow* win = (wxWindow*) node->Data();
- if (SendIdleEvents(win))
+ wxNode* node = win->GetChildren().First();
+ while (node)
+ {
+ wxWindow* win = (wxWindow*) node->Data();
+ if (SendIdleEvents(win))
needMore = TRUE;
- node = node->Next();
- }
+ node = node->Next();
+ }
return needMore ;
}
-int wxApp::OnExit(void)
+int wxApp::MainLoop()
{
- return 0;
+ gtk_main();
+ return 0;
}
-int wxApp::MainLoop(void)
+void wxApp::ExitMainLoop()
{
- gtk_main();
- return 0;
+ gtk_main_quit();
}
-void wxApp::ExitMainLoop(void)
+bool wxApp::Initialized()
{
- gtk_main_quit();
+ return m_initialized;
}
-bool wxApp::Initialized(void)
+bool wxApp::Pending()
{
- return m_initialized;
+ return FALSE;
}
-bool wxApp::Pending(void)
+void wxApp::Dispatch()
{
- return FALSE;
}
-void wxApp::Dispatch(void)
+#if wxUSE_THREADS
+void wxApp::ProcessPendingEvents()
{
+ wxNode *node = wxPendingEvents.First();
+ wxCriticalSectionLocker locker(wxPendingEventsLocker);
+
+ while (node)
+ {
+ wxEvtHandler *handler = (wxEvtHandler *)node->Data();
+
+ handler->ProcessPendingEvents();
+
+ delete node;
+
+ node = wxPendingEvents.First();
+ }
}
+#endif
-void wxApp::DeletePendingObjects(void)
+void wxApp::DeletePendingObjects()
{
- wxNode *node = wxPendingDelete.First();
- while (node)
- {
- wxObject *obj = (wxObject *)node->Data();
+ wxNode *node = wxPendingDelete.First();
+ while (node)
+ {
+ wxObject *obj = (wxObject *)node->Data();
- delete obj;
+ delete obj;
- if (wxPendingDelete.Member(obj))
- delete node;
+ if (wxPendingDelete.Member(obj))
+ delete node;
- node = wxPendingDelete.First();
- }
+ node = wxPendingDelete.First();
+ }
}
-wxWindow *wxApp::GetTopWindow(void)
+wxWindow *wxApp::GetTopWindow()
{
- if (m_topWindow) return m_topWindow;
- wxNode *node = wxTopLevelWindows.First();
- if (!node) return (wxWindow *) NULL;
- return (wxWindow*)node->Data();
+ if (m_topWindow) return m_topWindow;
+ wxNode *node = wxTopLevelWindows.First();
+ if (!node) return (wxWindow *) NULL;
+ return (wxWindow*)node->Data();
}
void wxApp::SetTopWindow( wxWindow *win )
{
- m_topWindow = win;
+ m_topWindow = win;
}
-void wxApp::CommonInit(void)
+bool wxApp::Initialize()
{
+ wxBuffer = new char[BUFSIZ + 512];
+
+ wxClassInfo::InitializeClasses();
+
+ wxSystemSettings::Init();
/*
-#if wxUSE_RESOURCES
- (void) wxGetResource("wxWindows", "OsVersion", &wxOsVersion);
-#endif
+ wxTheFontNameDirectory = new wxFontNameDirectory;
+ wxTheFontNameDirectory->Initialize();
*/
- wxSystemSettings::Init();
- wxTheResourceCache = new wxResourceCache(wxKEY_STRING);
- wxTheFontNameDirectory = new wxFontNameDirectory;
- wxTheFontNameDirectory->Initialize();
+ wxTheColourDatabase = new wxColourDatabase( wxKEY_STRING );
+ wxTheColourDatabase->Initialize();
- wxTheColourDatabase = new wxColourDatabase(wxKEY_STRING);
- wxTheColourDatabase->Initialize();
+ wxInitializeStockLists();
+ wxInitializeStockObjects();
- wxInitializeStockLists();
- wxInitializeStockObjects();
+#if wxUSE_WX_RESOURCES
+ wxTheResourceCache = new wxResourceCache( wxKEY_STRING );
- wxInitializeResourceSystem();
-
- // For PostScript printing
-#if wxUSE_POSTSCRIPT
- wxInitializePrintSetupData();
- wxThePrintPaperDatabase = new wxPrintPaperDatabase;
- wxThePrintPaperDatabase->CreateDatabase();
+ wxInitializeResourceSystem();
#endif
+ wxImage::InitStandardHandlers();
-/*
- wxBitmap::InitStandardHandlers();
+ /* no global cursor under X
+ g_globalCursor = new wxCursor; */
- g_globalCursor = new wxCursor;
-*/
+ wxModule::RegisterModules();
+ if (!wxModule::InitializeModules()) return FALSE;
+
+ return TRUE;
}
-void wxApp::CommonCleanUp(void)
+void wxApp::CleanUp()
{
- wxDELETE(wxTheColourDatabase);
- wxDELETE(wxThePrintPaperDatabase);
- wxDELETE(wxThePrintSetupData);
- wxDELETE(wxTheFontNameDirectory);
- wxDeleteStockObjects();
+ wxModule::CleanUpModules();
- wxFlushResources();
+#if wxUSE_WX_RESOURCES
+ wxFlushResources();
- wxDELETE(wxTheResourceCache);
+ if (wxTheResourceCache)
+ delete wxTheResourceCache;
+ wxTheResourceCache = (wxResourceCache*) NULL;
- wxDeleteStockLists();
+ wxCleanUpResourceSystem();
+#endif
- wxCleanUpResourceSystem();
+ if (wxTheColourDatabase)
+ delete wxTheColourDatabase;
+ wxTheColourDatabase = (wxColourDatabase*) NULL;
- wxSystemSettings::Done();
-}
+/*
+ if (wxTheFontNameDirectory) delete wxTheFontNameDirectory;
+ wxTheFontNameDirectory = (wxFontNameDirectory*) NULL;
+*/
-wxLog *wxApp::CreateLogTarget()
-{
- return new wxLogGui;
-}
+ wxDeleteStockObjects();
-//-----------------------------------------------------------------------------
-// wxEntry
-//-----------------------------------------------------------------------------
+ wxDeleteStockLists();
-int wxEntry( int argc, char *argv[] )
-{
- wxBuffer = new char[BUFSIZ + 512];
+ wxImage::CleanUpHandlers();
- wxClassInfo::InitializeClasses();
+ delete wxTheApp;
+ wxTheApp = (wxApp*) NULL;
-#if (WXDEBUG && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
+ wxSystemSettings::Done();
- streambuf* sBuf = new wxDebugStreamBuf;
- ostream* oStr = new ostream(sBuf) ;
- wxDebugContext::SetStream(oStr, sBuf);
+ delete[] wxBuffer;
-#endif
+ wxClassInfo::CleanUpClasses();
- if (!wxTheApp)
- {
- if (!wxApp::GetInitializerFunction())
+ // check for memory leaks
+#if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
+ if (wxDebugContext::CountObjectsLeft() > 0)
{
- printf( "wxWindows error: No initializer - use IMPLEMENT_APP macro.\n" );
- return 0;
+ wxLogDebug("There were memory leaks.\n");
+ wxDebugContext::Dump();
+ wxDebugContext::PrintStatistics();
}
+#endif
- wxAppInitializerFunction app_ini = wxApp::GetInitializerFunction();
-
- wxObject *test_app = app_ini();
-
- wxTheApp = (wxApp*) test_app;
- }
-
- if (!wxTheApp)
- {
- printf( "wxWindows error: wxTheApp == NULL\n" );
- return 0;
- }
-
- wxTheApp->argc = argc;
- wxTheApp->argv = argv;
-
- char name[200];
- strcpy( name, argv[0] );
- strcpy( name, wxFileNameFromPath(name) );
- wxStripExtension( name );
- wxTheApp->SetAppName( name );
-
- gtk_set_locale();
-
- gtk_init( &argc, &argv );
+ // do this as the very last thing because everything else can log messages
+ wxLog::DontCreateOnDemand();
-#ifdef wxUSE_GDK_IMLIB
+ wxLog *oldLog = wxLog::SetActiveTarget( (wxLog*) NULL );
+ if (oldLog)
+ delete oldLog;
+}
- gdk_imlib_init();
+wxLog *wxApp::CreateLogTarget()
+{
+ return new wxLogGui;
+}
- gtk_widget_push_visual(gdk_imlib_get_visual());
+//-----------------------------------------------------------------------------
+// wxEntry
+//-----------------------------------------------------------------------------
- gtk_widget_push_colormap(gdk_imlib_get_colormap());
+int wxEntry( int argc, char *argv[] )
+{
+ gtk_set_locale();
-#endif
+ gtk_init( &argc, &argv );
- wxApp::CommonInit();
+ if (!wxApp::Initialize())
+ return -1;
- wxTheApp->OnInitGui();
+ if (!wxTheApp)
+ {
+ wxCHECK_MSG( wxApp::GetInitializerFunction(), -1,
+ "wxWindows error: No initializer - use IMPLEMENT_APP macro.\n" );
- // Here frames insert themselves automatically
- // into wxTopLevelWindows by getting created
- // in OnInit().
+ wxAppInitializerFunction app_ini = wxApp::GetInitializerFunction();
- if (!wxTheApp->OnInit()) return 0;
+ wxObject *test_app = app_ini();
- wxTheApp->m_initialized = (wxTopLevelWindows.Number() > 0);
+ wxTheApp = (wxApp*) test_app;
+ }
- int retValue = 0;
+ wxCHECK_MSG( wxTheApp, -1, "wxWindows error: no application object" );
- if (wxTheApp->Initialized()) retValue = wxTheApp->OnRun();
+ wxTheApp->argc = argc;
+ wxTheApp->argv = argv;
- wxTheApp->DeletePendingObjects();
+ char name[200];
+ strcpy( name, argv[0] );
+ strcpy( name, wxFileNameFromPath(name) );
+ wxStripExtension( name );
+ wxTheApp->SetAppName( name );
- wxTheApp->OnExit();
+ if (!wxTheApp->OnInitGui())
+ return 0;
- wxApp::CommonCleanUp();
+ /* Here frames insert themselves automatically
+ * into wxTopLevelWindows by getting created
+ * in OnInit(). */
- wxDELETE(wxTheApp);
+ if (!wxTheApp->OnInit())
+ return 0;
- wxLog *oldLog = wxLog::SetActiveTarget( NULL );
- if (oldLog) delete oldLog;
-
- wxClassInfo::CleanUpClasses();
-
- delete[] wxBuffer;
-
-#if (WXDEBUG && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
-
- if (wxDebugContext::CountObjectsLeft() > 0)
- {
- wxTrace("There were memory leaks.\n");
- wxDebugContext::Dump();
- wxDebugContext::PrintStatistics();
- }
- wxDebugContext::SetStream(NULL, NULL);
-
-#endif
+ wxTheApp->m_initialized = (wxTopLevelWindows.Number() > 0);
- return retValue;
-}
+ int retValue = 0;
-//-----------------------------------------------------------------------------
-// main()
-//-----------------------------------------------------------------------------
+ if (wxTheApp->Initialized())
+ retValue = wxTheApp->OnRun();
-#if defined(AIX) || defined(AIX4) || defined(____HPUX__) || defined(NOMAIN)
+ wxWindow *topWindow = wxTheApp->GetTopWindow();
+ if (topWindow)
+ {
+ // Forcibly delete the window.
+ if (topWindow->IsKindOf(CLASSINFO(wxFrame)) ||
+ topWindow->IsKindOf(CLASSINFO(wxDialog)) )
+ {
+ topWindow->Close( TRUE );
+ wxTheApp->DeletePendingObjects();
+ }
+ else
+ {
+ delete topWindow;
+ wxTheApp->SetTopWindow( (wxWindow*) NULL );
+ }
+ }
- // main in IMPLEMENT_WX_MAIN in IMPLEMENT_APP in app.h
+ wxTheApp->OnExit();
-#else
+ // flush the logged messages if any
+ wxLog *log = wxLog::GetActiveTarget();
+ if (log != NULL && log->HasPendingMessages())
+ log->Flush();
- int main(int argc, char *argv[]) { return wxEntry(argc, argv); }
+ // continuing to use user defined log target is unsafe from now on because
+ // some resources may be already unavailable, so replace it by something
+ // more safe
+ wxLog *oldlog = wxLog::SetActiveTarget(new wxLogStderr);
+ if ( oldlog )
+ delete oldlog;
-#endif
+ wxApp::CleanUp();
+ return retValue;
+}
projects / wxWidgets.git / blobdiff