macosx: Simplify messages panel code, fix some invalid data accesses

Manipulate the data source on the main thread to fix some unprotected
accesses to the array.

Increase the maximum number of lines, for a more complete log.

modules/gui/macosx/DebugMessageVisualizer.m

@@ -38,9 +38,8 @@ static void MsgCallback(void *data, int type, const vlc_log_t *item, const char
 @interface VLCDebugMessageVisualizer () <NSWindowDelegate>
 {
     NSMutableArray * _msg_arr;
-    NSLock * _msg_lock;
 }
-- (void)processReceivedlibvlcMessage:(const vlc_log_t *) item ofType: (int)i_type withStr: (char *)str;
+- (void)appendMessage:(NSMutableAttributedString *) message;
 
 @end
 
@@ -52,13 +51,34 @@ static void MsgCallback(void *data, int type, const vlc_log_t *item, const char
 
         int canc = vlc_savecancel();
         char *str;
-
         if (vasprintf(&str, format, ap) == -1) {
             vlc_restorecancel(canc);
             return;
         }
 
-        [visualizer processReceivedlibvlcMessage: item ofType: type withStr: str];
+        if (!item->psz_module)
+            return;
+        if (!str)
+            return;
+
+        NSColor *_white = [NSColor whiteColor];
+        NSColor *_red = [NSColor redColor];
+        NSColor *_yellow = [NSColor yellowColor];
+        NSColor *_gray = [NSColor grayColor];
+
+        NSColor * pp_color[4] = { _white, _red, _yellow, _gray };
+        static const char * ppsz_type[4] = { ": ", " error: ", " warning: ", " debug: " };
+
+
+        NSString *firstString = [NSString stringWithFormat:@"%s%s", item->psz_module, ppsz_type[type]];
+        NSString *secondString = [NSString stringWithFormat:@"%@%s\n", firstString, str];
+
+        NSDictionary *colorAttrib = [NSDictionary dictionaryWithObject: pp_color[type]  forKey: NSForegroundColorAttributeName];
+        NSMutableAttributedString *coloredMsg = [[NSMutableAttributedString alloc] initWithString: secondString attributes: colorAttrib];
+        colorAttrib = [NSDictionary dictionaryWithObject: pp_color[3] forKey: NSForegroundColorAttributeName];
+        [coloredMsg setAttributes: colorAttrib range: NSMakeRange(0, [firstString length])];
+
+        [visualizer performSelectorOnMainThread:@selector(appendMessage:) withObject:coloredMsg waitUntilDone:NO];
 
         vlc_restorecancel(canc);
         free(str);
@@ -71,7 +91,6 @@ static void MsgCallback(void *data, int type, const vlc_log_t *item, const char
 {
     self = [super initWithWindowNibName:@"DebugMessageVisualizer"];
     if (self) {
-        _msg_lock = [[NSLock alloc] init];
         _msg_arr = [NSMutableArray arrayWithCapacity:600];
     }
     return self;
@@ -146,63 +165,22 @@ static void MsgCallback(void *data, int type, const vlc_log_t *item, const char
 
 - (NSInteger)numberOfRowsInTableView:(NSTableView *)aTableView
 {
-    if (aTableView == _msgs_table)
-        return [_msg_arr count];
-    return 0;
+    return [_msg_arr count];
 }
 
 - (id)tableView:(NSTableView *)aTableView objectValueForTableColumn:(NSTableColumn *)aTableColumn row:(NSInteger)rowIndex
 {
-    NSMutableAttributedString *result = NULL;
-
-    [_msg_lock lock];
-    if (rowIndex < [_msg_arr count])
-        result = [_msg_arr objectAtIndex:rowIndex];
-    [_msg_lock unlock];
-
-    if (result != NULL)
-        return result;
-    else
-        return @"";
+    return [_msg_arr objectAtIndex:rowIndex];
 }
 
-- (void)processReceivedlibvlcMessage:(const vlc_log_t *) item ofType: (int)i_type withStr: (char *)str
+- (void)appendMessage:(NSMutableAttributedString *) message
 {
-    if (_msg_arr) {
-        NSColor *_white = [NSColor whiteColor];
-        NSColor *_red = [NSColor redColor];
-        NSColor *_yellow = [NSColor yellowColor];
-        NSColor *_gray = [NSColor grayColor];
-        NSString * firstString, * secondString;
-
-        NSColor * pp_color[4] = { _white, _red, _yellow, _gray };
-        static const char * ppsz_type[4] = { ": ", " error: ", " warning: ", " debug: " };
-
-        NSDictionary *_attr;
-        NSMutableAttributedString *_msg_color;
-
-        [_msg_lock lock];
-
-        if ([_msg_arr count] > 10000) {
-            [_msg_arr removeObjectAtIndex: 0];
-            [_msg_arr removeObjectAtIndex: 1];
-        }
-        if (!item->psz_module)
-            return;
-        if (!str)
-            return;
-
-        firstString = [NSString stringWithFormat:@"%s%s", item->psz_module, ppsz_type[i_type]];
-        secondString = [NSString stringWithFormat:@"%@%s\n", firstString, str];
-
-        _attr = [NSDictionary dictionaryWithObject: pp_color[i_type]  forKey: NSForegroundColorAttributeName];
-        _msg_color = [[NSMutableAttributedString alloc] initWithString: secondString attributes: _attr];
-        _attr = [NSDictionary dictionaryWithObject: pp_color[3] forKey: NSForegroundColorAttributeName];
-        [_msg_color setAttributes: _attr range: NSMakeRange(0, [firstString length])];
-        [_msg_arr addObject:_msg_color];
-
-        [_msg_lock unlock];
+    if ([_msg_arr count] > 1000000) {
+        [_msg_arr removeObjectAtIndex: 0];
+        [_msg_arr removeObjectAtIndex: 1];
     }
+
+    [_msg_arr addObject:message];
 }
 
 @end