ijksdl: ios: layout glview on display thread

ios/IJKMediaPlayer/IJKMediaPlayer/ijkmedia/ijksdl/ios/IJKSDLGLView.m

@@ -150,6 +150,8 @@ static void mat4f_LoadOrtho(float left, float right, float bottom, float top, fl
     int             _frameChroma;
 
     id<IJKSDLGLRender> _renderer;
+
+    BOOL            _didRelayoutSubViews;
 }
 
 enum {
@@ -259,6 +261,11 @@ enum {
 }
 
 - (void)layoutSubviews
+{
+    _didRelayoutSubViews = YES;
+}
+
+- (void)layoutOnDisplayThread
 {
     glBindRenderbuffer(GL_RENDERBUFFER, _renderbuffer);
     [_context renderbufferStorage:GL_RENDERBUFFER fromDrawable:(CAEAGLLayer*)self.layer];
@@ -276,7 +283,8 @@ enum {
     }
 
     [self updateVertices];
-    [self display: nil];
+    // FIXME: trigger a redisplay on display thread
+    // [self display: nil];
 }
 
 - (void)setContentMode:(UIViewContentMode)contentMode
@@ -441,6 +449,11 @@ exit:
 
     [EAGLContext setCurrentContext:_context];
 
+    if (_didRelayoutSubViews) {
+        [self layoutOnDisplayThread];
+        _didRelayoutSubViews = NO;
+    }
+
     glBindFramebuffer(GL_FRAMEBUFFER, _framebuffer);
     glViewport(0, 0, _backingWidth, _backingHeight);
     glClearColor(0.0f, 0.0f, 0.0f, 1.0f);