File size: 2,560 Bytes
b1b3bae | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 | using System;
using System.ComponentModel;
using System.Windows.Forms;
using OpenTK;
using OpenTK.Graphics;
namespace SkiaSharp.Views.Desktop
{
[DefaultEvent("PaintSurface")]
[DefaultProperty("Name")]
public class SKGLControl : GLControl
{
private bool designMode;
private GRContext grContext;
private GRBackendRenderTargetDesc renderTarget;
public SKGLControl()
: base(new GraphicsMode(new ColorFormat(8, 8, 8, 8), 24, 8))
{
Initialize();
}
public SKGLControl(GraphicsMode mode)
: base(mode)
{
Initialize();
}
public SKGLControl(GraphicsMode mode, int major, int minor, GraphicsContextFlags flags)
: base(mode, major, minor, flags)
{
Initialize();
}
private void Initialize()
{
designMode = DesignMode || LicenseManager.UsageMode == LicenseUsageMode.Designtime;
ResizeRedraw = true;
}
[Bindable(false)]
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
[EditorBrowsable(EditorBrowsableState.Never)]
public SKSize CanvasSize => new SKSize(renderTarget.Width, renderTarget.Height);
[Bindable(false)]
[Browsable(false)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
[EditorBrowsable(EditorBrowsableState.Never)]
public GRContext GRContext => grContext;
[Category("Appearance")]
public event EventHandler<SKPaintGLSurfaceEventArgs> PaintSurface;
protected override void OnPaint(PaintEventArgs e)
{
if (designMode)
{
e.Graphics.Clear(BackColor);
return;
}
base.OnPaint(e);
// create the contexts if not done already
if (grContext == null)
{
var glInterface = GRGlInterface.CreateNativeGlInterface();
grContext = GRContext.Create(GRBackend.OpenGL, glInterface);
// get initial details
renderTarget = SKGLDrawable.CreateRenderTarget();
}
// update to the latest dimensions
renderTarget.Width = Width;
renderTarget.Height = Height;
// create the surface
using (var surface = SKSurface.Create(grContext, renderTarget))
{
// start drawing
OnPaintSurface(new SKPaintGLSurfaceEventArgs(surface, renderTarget));
surface.Canvas.Flush();
}
// update the control
SwapBuffers();
}
protected virtual void OnPaintSurface(SKPaintGLSurfaceEventArgs e)
{
// invoke the event
PaintSurface?.Invoke(this, e);
}
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
// clean up
if (grContext != null)
{
grContext.Dispose();
grContext = null;
}
}
}
}
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