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Scale window size on hi-dpi mode

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Follow high-dpi guidelines for scaling a window on high-dpi modes.
This commit is contained in:
Stefanos A. 2013-11-14 09:02:47 +01:00
parent 94e2649704
commit 7c8cc5f746
1 changed files with 74 additions and 2 deletions
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76
Source/OpenTK/Platform/Windows/WinGLNative.cs
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@ -125,10 +125,20 @@ namespace OpenTK.Platform.Windows
// To avoid issues with Ati drivers on Windows 6+ with compositing enabled, the context will not be
// bound to the top-level window, but rather to a child window docked in the parent.
int scale_width = ScaleX(width);
int scale_height = ScaleY(height);
int scale_x = x - UnscaleX(scale_width - width);
int scale_y = y - UnscaleY(scale_height - height);
window = new WinWindowInfo(
CreateWindow(x, y, width, height, title, options, device, IntPtr.Zero), null);
CreateWindow(
scale_x, scale_y, scale_width, scale_height,
title, options, device, IntPtr.Zero),
null);
child_window = new WinWindowInfo(
CreateWindow(0, 0, ClientSize.Width, ClientSize.Height, title, options, device, window.Handle), window);
CreateWindow(
0, 0, ClientSize.Width, ClientSize.Height,
title, options, device, window.Handle),
window);
exists = true;
@ -150,6 +160,68 @@ namespace OpenTK.Platform.Windows
#region Private Members
#region Scale
enum ScaleDirection { X, Y }
// Scales a value according according
// to the DPI of the specified direction
static int Scale(int v, ScaleDirection direction)
{
IntPtr dc = Functions.GetDC(IntPtr.Zero);
if (dc != IntPtr.Zero)
{
int dpi = Functions.GetDeviceCaps(dc,
direction == ScaleDirection.X ? DeviceCaps.LogPixelsX : DeviceCaps.LogPixelsY);
if (dpi > 0)
{
float scale = dpi / 96.0f;
v = (int)Math.Round(v * scale);
}
Functions.ReleaseDC(IntPtr.Zero, dc);
}
return v;
}
static int ScaleX(int x)
{
return Scale(x, ScaleDirection.X);
}
static int ScaleY(int y)
{
return Scale(y, ScaleDirection.Y);
}
static int Unscale(int v, ScaleDirection direction)
{
IntPtr dc = Functions.GetDC(IntPtr.Zero);
if (dc != IntPtr.Zero)
{
int dpi = Functions.GetDeviceCaps(dc,
direction == ScaleDirection.X ? DeviceCaps.LogPixelsX : DeviceCaps.LogPixelsY);
if (dpi > 0)
{
float scale = dpi / 96.0f;
v = (int)Math.Round(v / scale);
}
Functions.ReleaseDC(IntPtr.Zero, dc);
}
return v;
}
static int UnscaleX(int x)
{
return Unscale(x, ScaleDirection.X);
}
static int UnscaleY(int y)
{
return Unscale(y, ScaleDirection.Y);
}
#endregion
#region WindowProcedure
IntPtr WindowProcedure(IntPtr handle, WindowMessage message, IntPtr wParam, IntPtr lParam)