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Use optimised BitBlt function to transfer pixels to the window for the launcher. Saves 3-4 milliseconds when redrawing the launcher on a 1920x1080 window size.

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This commit is contained in:
UnknownShadow200 2016-04-01 22:18:29 +11:00
parent b547378184
commit 3f940d4f41
1 changed files with 34 additions and 6 deletions
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40
Launcher2/Gui/PlatformDrawer.cs
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@ -2,6 +2,7 @@
using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Security;
using ClassicalSharp;
using OpenTK.Platform;
using OpenTK.Platform.X11;
@ -22,19 +23,46 @@ namespace Launcher {
public sealed class WinPlatformDrawer : PlatformDrawer {
Graphics g;
const uint SRCCOPY = 0xCC0020;
[DllImport("gdi32.dll"), SuppressUnmanagedCodeSecurity]
static extern int BitBlt( IntPtr dcDst, int dstX, int dstY, int width, int height,
IntPtr dcSrc, int srcX, int srcY, uint drawOp );
[DllImport("user32.dll"), SuppressUnmanagedCodeSecurity]
static extern IntPtr GetDC( IntPtr hwnd );
[DllImport("gdi32.dll"), SuppressUnmanagedCodeSecurity]
static extern IntPtr CreateCompatibleDC(IntPtr dc);
[DllImport("gdi32.dll"), SuppressUnmanagedCodeSecurity]
static extern IntPtr SelectObject( IntPtr dc, IntPtr handle );
[DllImport("gdi32.dll"), SuppressUnmanagedCodeSecurity]
static extern int DeleteObject( IntPtr handle );
[DllImport("user32.dll"), SuppressUnmanagedCodeSecurity]
static extern int ReleaseDC( IntPtr dc, IntPtr hwnd );
IntPtr dc;
public override void Init( IWindowInfo info ) {
g = Graphics.FromHwnd( info.WinHandle );
dc = GetDC( info.WinHandle );
}
public override void Resize( IWindowInfo info ) {
if( g != null )
g.Dispose();
g = Graphics.FromHwnd( info.WinHandle );
if( dc != IntPtr.Zero )
ReleaseDC( info.WinHandle, dc );
dc = GetDC( info.WinHandle );
}
public override void Display( IWindowInfo info, Bitmap framebuffer ) {
g.DrawImage( framebuffer, 0, 0, framebuffer.Width, framebuffer.Height );
IntPtr srcDC = CreateCompatibleDC( dc );
IntPtr srcHB = framebuffer.GetHbitmap();
IntPtr oldSrc = SelectObject( srcDC, srcHB );
int success = BitBlt( dc, 0, 0, framebuffer.Width, framebuffer.Height, srcDC, 0, 0, SRCCOPY );
SelectObject( srcDC, oldSrc );
DeleteObject( srcDC );
DeleteObject( srcHB );
}
}