IBackend instead of IDevice to bind to Interface

1 files changed, 179 insertions, 0 deletions

diff --git a/Backends/CairoBackend/src/ImageBackend.cs b/Backends/CairoBackend/src/ImageBackend.cs
new file mode 100644
index 00000000..e390ca98
--- /dev/null
+++ b/Backends/CairoBackend/src/ImageBackend.cs
@@ -0,0 +1,179 @@
+using System;
+using System.IO;
+using Drawing2D;
+using Glfw;
+
+namespace Crow.CairoBackend
+{
+	public class ImageBackend : IBackend {
+		ISurface surf;
+		/// <summary> Global font rendering settings for Cairo </summary>
+		FontOptions FontRenderingOptions;
+		/// <summary> Global font rendering settings for Cairo </summary>
+		Antialias Antialias = Antialias.Subpixel;
+		protected ImageBackend ()
+		{
+			FontRenderingOptions = new FontOptions ();
+			FontRenderingOptions.Antialias = Antialias.Subpixel;
+			FontRenderingOptions.HintMetrics = HintMetrics.On;
+			FontRenderingOptions.HintStyle = HintStyle.Full;
+			FontRenderingOptions.SubpixelOrder = SubpixelOrder.Default;
+		}
+		/// <summary>
+		/// Create a new generic backend bound to the application surface
+		/// </summary>
+		/// <param name="width">backend surface width</param>
+		/// <param name="height">backend surface height</param>
+		public ImageBackend (IntPtr nativeWindoPointer, int width, int height) : this () {
+
+			switch (Environment.OSVersion.Platform) {
+			case PlatformID.Unix:
+				IntPtr disp = Glfw3.GetX11Display ();
+				IntPtr nativeWin = Glfw3.GetX11Window (nativeWindoPointer);
+				Int32 scr = Glfw3.GetX11DefaultScreen (disp);
+				IntPtr visual = Glfw3.GetX11DefaultVisual (disp, scr);
+				surf = new XlibSurface (disp, nativeWin, visual, width, height);
+				break;
+			case PlatformID.Win32NT:
+			case PlatformID.Win32S:
+			case PlatformID.Win32Windows:
+				IntPtr hWin32 = Glfw3.GetWin32Window (nativeWindoPointer);
+				IntPtr hdc = Glfw3.GetWin32DC (hWin32);
+				surf = new Win32Surface (hdc);
+				break;
+			default:
+				throw new PlatformNotSupportedException ("Unable to create cairo image backend.");
+			}
+		}
+		/// <summary>
+		/// Create a new offscreen backend, used in perfTests
+		/// </summary>
+		/// <param name="width">backend surface width</param>
+		/// <param name="height">backend surface height</param>
+		public ImageBackend (int width, int height) : this () {
+			surf = new ImageSurface (Format.ARGB32, width, height);
+		}
+		~ImageBackend ()
+		{
+			Dispose (false);
+		}
+		public virtual ISurface CreateSurface(int width, int height)
+			=> new ImageSurface (Format.ARGB32, width, height);
+		public virtual ISurface CreateSurface(byte[] data, int width, int height)
+			=> new ImageSurface (data, Format.ARGB32, width, height, 4 * width);
+		public ISurface MainSurface => surf;
+		public IRegion CreateRegion () => new Region ();
+		public IContext CreateContext (ISurface surf)
+		{
+			Context gr = new Context (surf);
+			gr.FontOptions = FontRenderingOptions;
+			gr.Antialias = Antialias;
+			return gr;
+		}
+		//IPattern CreatePattern (PatternType patternType);
+		public IGradient CreateGradient (GradientType gradientType, Rectangle bounds)
+		{
+			switch (gradientType) {
+			case GradientType.Vertical:
+				return new LinearGradient (bounds.Left, bounds.Top, bounds.Left, bounds.Bottom);
+			case GradientType.Horizontal:
+				return new LinearGradient (bounds.Left, bounds.Top, bounds.Right, bounds.Top);
+			case GradientType.Oblic:
+				return new LinearGradient (bounds.Left, bounds.Top, bounds.Right, bounds.Bottom);
+			case GradientType.Radial:
+				throw new NotImplementedException ();
+			}
+			return null;
+		}
+		public byte[] LoadBitmap (Stream stream, out Size dimensions)
+		{
+			byte[] image;
+#if STB_SHARP
+			StbImageSharp.ImageResult stbi = StbImageSharp.ImageResult.FromStream (stream, StbImageSharp.ColorComponents.RedGreenBlueAlpha);
+			image = new byte[stbi.Data.Length];
+			//rgba to argb for cairo.
+			for (int i = 0; i < stbi.Data.Length; i += 4) {
+				image[i] = stbi.Data[i + 2];
+				image[i + 1] = stbi.Data[i + 1];
+				image[i + 2] = stbi.Data[i];
+				image[i + 3] = stbi.Data[i + 3];
+			}
+			dimensions = new Size (stbi.Width, stbi.Height);
+#else
+			using (StbImage stbi = new StbImage (stream)) {
+				image = new byte [stbi.Size];
+				for (int i = 0; i < stbi.Size; i+=4) {
+					//rgba to argb for cairo. ???? looks like bgra to me.
+					image [i] = Marshal.ReadByte (stbi.Handle, i + 2);
+					image [i + 1] = Marshal.ReadByte (stbi.Handle, i + 1);
+					image [i + 2] = Marshal.ReadByte (stbi.Handle, i);
+					image [i + 3] = Marshal.ReadByte (stbi.Handle, i + 3);
+				}
+				dimensions = new Size (stbi.Width, stbi.Height);
+			}
+#endif
+			return image;
+		}
+		public ISvgHandle LoadSvg(Stream stream)
+		{
+			using (BinaryReader sr = new BinaryReader (stream))
+				return new SvgHandle (sr.ReadBytes ((int)stream.Length));
+		}
+		public ISvgHandle LoadSvg(string svgFragment) =>
+			new SvgHandle (System.Text.Encoding.Unicode.GetBytes (svgFragment));
+		bool disposeContextOnFlush;
+		IRegion clipping;
+		protected void clear(IContext ctx) {
+			for (int i = 0; i < clipping.NumRectangles; i++)
+				ctx.Rectangle (clipping.GetRectangle (i));
+
+			ctx.ClipPreserve ();
+			ctx.Operator = Operator.Clear;
+			ctx.Fill ();
+			ctx.Operator = Operator.Over;
+		}
+		public IContext PrepareUIFrame(IContext existingContext, IRegion clipping)
+		{
+			this.clipping = clipping;
+			IContext ctx = existingContext;
+			if (ctx == null) {
+				disposeContextOnFlush = true;
+				ctx = new Context (MainSurface);
+			} else
+				disposeContextOnFlush = false;
+
+			clear (ctx);
+			ctx.PushGroup ();
+
+			return ctx;
+		}
+		public void FlushUIFrame(IContext ctx)
+		{
+			ctx.PopGroupToSource ();
+			ctx.Paint ();
+
+			if (disposeContextOnFlush)
+				ctx.Dispose ();
+			clipping = null;
+		}
+
+
+		#region IDispose implementation
+		bool isDisposed;
+		public void Dispose ()
+		{
+			Dispose (true);
+			GC.SuppressFinalize (this);
+		}
+		protected virtual void Dispose (bool disposing)
+		{
+			if (!isDisposed && disposing) {
+				surf.Dispose ();
+				FontRenderingOptions.Dispose ();
+			}
+			isDisposed = true;
+		}
+		#endregion
+	}
+}
+