From 863dba5787fa791bc8a26ed8fca6ea86ec9cae49 Mon Sep 17 00:00:00 2001
From: Siyu Zhang <astro6974@gmail.com>
Date: Mon, 5 Apr 2021 19:13:20 +0800
Subject: [PATCH] Fix displayed zoom factor by setting bitmap DPI=96

---
 Plugin.cs                           | 6 ++++--
 StandaloneViewer/MainWindow.xaml    | 4 ++--
 StandaloneViewer/MainWindow.xaml.cs | 8 ++++----
 3 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/Plugin.cs b/Plugin.cs
index 413dd5b..64c96e5 100644
--- a/Plugin.cs
+++ b/Plugin.cs
@@ -154,6 +154,7 @@ public bool CanHandle(string path)
                 path.ToLower().EndsWith(".fit") || path.ToLower().EndsWith(".fts"));
         }
 
+
         public void Prepare(string path, ContextObject context)
         {
             _fitsImagePtr = NativeMethods.FitsImageCreate(path);
@@ -163,6 +164,7 @@ public void Prepare(string path, ContextObject context)
             context.SetPreferredSizeFit(size, 0.8);
         }
 
+
         public void View(string path, ContextObject context)
         {
             var header = NativeMethods.FitsImageGetHeader(_fitsImagePtr);
@@ -176,11 +178,11 @@ public void View(string path, ContextObject context)
             int rawStride = outputDim.nx * outputDim.nc;
             if (outputDim.nc == 3)
             {
-                bitmapSource = BitmapSource.Create(outputDim.nx, outputDim.ny, 300, 300, PixelFormats.Rgb24, null, img, rawStride);
+                bitmapSource = BitmapSource.Create(outputDim.nx, outputDim.ny, 96, 96, PixelFormats.Rgb24, null, img, rawStride);
             }
             else
             {
-                bitmapSource = BitmapSource.Create(outputDim.nx, outputDim.ny, 300, 300, PixelFormats.Gray8, null, img, rawStride);
+                bitmapSource = BitmapSource.Create(outputDim.nx, outputDim.ny, 96, 96, PixelFormats.Gray8, null, img, rawStride);
             }
 
             _ip = new ImagePanel(context, header);
diff --git a/StandaloneViewer/MainWindow.xaml b/StandaloneViewer/MainWindow.xaml
index fac7f80..e263e6d 100644
--- a/StandaloneViewer/MainWindow.xaml
+++ b/StandaloneViewer/MainWindow.xaml
@@ -1,11 +1,11 @@
-<Window x:Class="StandaloneViewer.MainWindow"
+<Window x:Class="StandaloneViewer.MainWindow"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:local="clr-namespace:StandaloneViewer"
         mc:Ignorable="d"
-        Title="MainWindow" Height="450" Width="800">
+        Title="MainWindow" Height="720" Width="1280">
     <Grid>
         <!--<Grid.RowDefinitions>
             <RowDefinition Height="*"/>
diff --git a/StandaloneViewer/MainWindow.xaml.cs b/StandaloneViewer/MainWindow.xaml.cs
index 7d5c9a1..93cbff8 100644
--- a/StandaloneViewer/MainWindow.xaml.cs
+++ b/StandaloneViewer/MainWindow.xaml.cs
@@ -1,4 +1,4 @@
-/*    
+/*    
 	QuickFits - FITS file preview plugin for QL-win
     Copyright (C) 2021 Siyu Zhang
 
@@ -157,19 +157,19 @@ public MainWindow()
             int rawStride = bufferSize.nx * bufferSize.nc;
             if (bufferSize.nc == 3)
             {
-                bitmapSource = BitmapSource.Create(bufferSize.nx, bufferSize.ny, 300, 300, PixelFormats.Rgb24, null, img, rawStride);
+                bitmapSource = BitmapSource.Create(bufferSize.nx, bufferSize.ny, 96, 96, PixelFormats.Rgb24, null, img, rawStride);
             }
             else
             {
-                bitmapSource = BitmapSource.Create(bufferSize.nx, bufferSize.ny, 300, 300, PixelFormats.Gray8, null, img, rawStride);
+                bitmapSource = BitmapSource.Create(bufferSize.nx, bufferSize.ny, 96, 96, PixelFormats.Gray8, null, img, rawStride);
             }
 
             var co = new ContextObject();
             _ip = new ImagePanel(co, header);
-            _ip.Source = bitmapSource;
 
             var size = new Size(bufferSize.nx, bufferSize.ny);
             co.SetPreferredSizeFit(size, 0.8);
+            _ip.Source = bitmapSource;
 
             _tabUserPage = new TabItem { Content = _ip };
             MainTab.Items.Add(_tabUserPage);