Windows scaling factor is applied twice to SVG images when loaded from XRC

[jkatins]

Operating system: Win 11 64bit wxPython version & source: 4.2.3 msw (phoenix) wxWidgets 3.2.7 from PyPI Python version & source: 3.13.8 (main, Oct 7 2025, 15:31:04) [MSC v.1944 64 bit (AMD64)]

Description of the problem:

In Windows Display Settings, set Scale to 100%. Example app below looks as expected:

Set Scale to 200%, button is scaled to 200% but SVG to 400%:

When loading the SVG manually, scaling works fine, see commented section in demo_dialog.py below - although I would have expected the need to use FromDIP(), but when I do that we're back to 400%.

Code Example (click to expand)

demo_dialog.py

import ctypes
PROCESS_PER_MONITOR_DPI_AWARE = 2
ctypes.windll.shcore.SetProcessDpiAwareness(PROCESS_PER_MONITOR_DPI_AWARE)

import wx
import wx.xrc
app = wx.App()
dialog = wx.xrc.XmlResource("demo_dialog.xrc").LoadDialog(None, "DemoDialog")

# Workaround: 
#import wx.svg
#svg_img = wx.svg.SVGimage.CreateFromFile("icon.svg")
#bitmap = svg_img.ConvertToScaledBitmap(wx.Size(55, 44))
#dialog.FindWindowByName("svg").SetBitmap(bitmap)

dialog.ShowModal()
dialog.Destroy()
app.MainLoop()

demo_dialog.xrc

<?xml version="1.0" ?>
<resource>
  <object class="wxDialog" name="DemoDialog">
    <object class="wxBoxSizer">
      <orient>wxHORIZONTAL</orient>
      <object class="sizeritem">
        <object class="wxStaticBitmap">
          <bitmap default_size="55,44">icon.svg</bitmap>
        </object>
      </object>
      <object class="sizeritem">
        <object class="wxButton">
          <label>Button</label>
          <size>55,44</size>
        </object>
      </object>
    </object>
  </object>
</resource>

icon.svg

<?xml version='1.0' encoding='utf-8'?>
<svg xmlns="http://www.w3.org/2000/svg" width="800px" height="800px" viewBox="-3 -3 30 30">
    <g><rect x="-3" y="-3" width="30" height="30" rx="0" fill="red" /></g>
    <path d="M5 6H19M5 10H19M5 14H19M5 18H19" stroke="#000000" />
</svg>