fixed: changing color channel after rotation/flipping messed up render size

#2220

Author: d2phap

Source/Components/ImageGlass.Views/ViewerCanvas.cs

@@ -3386,10 +3386,16 @@ public bool FilterColorChannels(ColorChannels colors, bool requestRerender = tru
         _d2dImage = effect.GetD2D1Bitmap1(Device, ignoreAlpha);
 
 
+        // update new source size
+        var newSize = _d2dImage.GetSize();
+        var isSizeChanged = newSize.width != SourceWidth || newSize.height != SourceHeight;
+        SourceWidth = newSize.width;
+        SourceHeight = newSize.height;
+
         // render the transformation
         if (requestRerender)
         {
-            Refresh(resetZoom: false);
+            Refresh(resetZoom: isSizeChanged);
         }
 
         return true;

Source/ImageGlass/FrmMain/FrmMain.IGMethods.cs

@@ -3492,7 +3492,7 @@ private void SetImageColorChannels(ColorChannels channels)
 
 
         // apply color channels filter
-        if (PicMain.FilterColorChannels(channels, true))
+        if (PicMain.FilterColorChannels(channels, false))
         {
             Local.ImageChannels = channels;
 
@@ -3501,6 +3501,14 @@ private void SetImageColorChannels(ColorChannels channels)
             MnuViewChannelGreen.Checked = channels.HasFlag(ColorChannels.G);
             MnuViewChannelBlue.Checked = channels.HasFlag(ColorChannels.B);
             MnuViewChannelAlpha.Checked = channels.HasFlag(ColorChannels.A);
+
+            if (Local.ImageTransform.HasChanges)
+            {
+                _ = PicMain.RotateImage(Local.ImageTransform.Rotation, false);
+                _ = PicMain.FlipImage(Local.ImageTransform.Flips, false);
+            }
+
+            PicMain.Refresh(resetZoom: false);
         }
         else
         {