Implement AcceleratedPaintInfo (#4796)

* Implement AcceleratedPaintInfo so the shared texture can be used for accelerated rendering in a custom IRenderHandler.

* Make AcceleratedPaintInfo members get-only properties, set via constructor.
Add XML comments, based on CEF.

---------

Co-authored-by: Dennis de Bruijn <d.de.bruijn@tss.nl>

CefSharp.Core.Runtime/Internals/RenderClientAdapter.h

@@ -153,7 +153,8 @@ namespace CefSharp
             virtual DECL void OnAcceleratedPaint(CefRefPtr<CefBrowser> browser, PaintElementType type, const RectList& dirtyRects, const CefAcceleratedPaintInfo& info) override
             {
                 CefRect r = dirtyRects.front();
-                _renderWebBrowser->OnAcceleratedPaint((CefSharp::PaintElementType)type, CefSharp::Structs::Rect(r.x, r.y, r.width, r.height), nullptr);
+                AcceleratedPaintInfo^ api = gcnew AcceleratedPaintInfo((IntPtr)info.shared_texture_handle, (ColorType)info.format);
+                _renderWebBrowser->OnAcceleratedPaint((CefSharp::PaintElementType)type, CefSharp::Structs::Rect(r.x, r.y, r.width, r.height), api);
             }
 
             virtual DECL void OnPaint(CefRefPtr<CefBrowser> browser, PaintElementType type, const RectList& dirtyRects,

CefSharp/AcceleratedPaintInfo.cs

@@ -2,12 +2,36 @@
 //
 // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
 
+using System;
+using CefSharp.Enums;
+
 namespace CefSharp
 {
     /// <summary>
-    /// AcceleratedPaintInfo
+    /// Class representing accelerated paint info.
     /// </summary>
     public sealed class AcceleratedPaintInfo
     {
+        /// <summary>
+        /// Handle for the shared texture. The shared texture is instantiated
+        /// without a keyed mutex.
+        /// </summary>
+        public IntPtr SharedTextureHandle { get; }
+
+        /// <summary>
+        /// The pixel format of the texture.
+        /// </summary>
+        public ColorType Format { get; }
+
+        /// <summary>
+        /// AcceleratedPaintInfo
+        /// </summary>
+        /// <param name="sharedTextureHandle">Handle to the shared texture resource</param>
+        /// <param name="format">The pixel format of the shared texture resource</param>
+        public AcceleratedPaintInfo(IntPtr sharedTextureHandle, ColorType format)
+        {
+            SharedTextureHandle = sharedTextureHandle;
+            Format = format;
+        }
     }
 }