add GetBuffer() api and its sample.

Author: hecomi

Assets/uWindowCapture/Examples/Buffer/Buffer.unity

@@ -1,24 +1,24 @@
-using UnityEngine;
-using System;
-using System.Runtime.InteropServices;
-
-namespace uWindowCapture
-{
-
-public class UwcGetBufferExample : MonoBehaviour
-{
-    [SerializeField]
-    UwcWindowTexture uwcTexture;
-
-    Texture2D texture_;
-    Color32[] pixels_;
-    GCHandle handle_;
-    IntPtr ptr_ = IntPtr.Zero;
-
-    [DllImport("msvcrt.dll", CallingConvention = CallingConvention.Cdecl, SetLastError = false)]
-    public static extern IntPtr memcpy(IntPtr dest, IntPtr src, int count);
-
-    bool isValid
+using UnityEngine;
+using System;
+using System.Runtime.InteropServices;
+
+namespace uWindowCapture
+{
+
+public class UwcGetBufferExample : MonoBehaviour
+{
+    [SerializeField]
+    UwcWindowTexture uwcTexture;
+
+    Texture2D texture_;
+    Color32[] pixels_;
+    GCHandle handle_;
+    IntPtr ptr_ = IntPtr.Zero;
+
+    [DllImport("msvcrt.dll", CallingConvention = CallingConvention.Cdecl, SetLastError = false)]
+    public static extern IntPtr memcpy(IntPtr dest, IntPtr src, int count);
+
+    bool isValid
     {
         get 
         { 
@@ -27,60 +27,39 @@ bool isValid
             var window = uwcTexture.window;
             return window != null && window.buffer != IntPtr.Zero;
         }
-    }
-
-    void OnDestroy()
-    {
-        if (ptr_ != IntPtr.Zero) {
-            handle_.Free();
-        }
-    }
-
-    void Update()
-    {
-        if (!isValid) return;
-
-        var window = uwcTexture.window;
-        if (texture_ == null || 
-            window.bufferWidth != texture_.width || 
-            window.bufferHeight != texture_.height) {
-            UpdateTexture();
-        }
-
-        CopyTexture();
-    }
-
-    void UpdateTexture()
-    {
-        if (!isValid) return;
-
-        var window = uwcTexture.window;
-        var width = window.bufferWidth;
-        var height = window.bufferHeight;
-
-        texture_ = new Texture2D(width, height, TextureFormat.RGBA32, false);
-        texture_.filterMode = FilterMode.Bilinear;
-        pixels_ = texture_.GetPixels32();
-        handle_ = GCHandle.Alloc(pixels_, GCHandleType.Pinned);
-        ptr_ = handle_.AddrOfPinnedObject();
-
-        GetComponent<Renderer>().material.mainTexture = texture_;
-    }
-
-    void CopyTexture()
-    {
-        if (!isValid) return;
-
-        var window = uwcTexture.window;
-        var width = window.bufferWidth;
-        var height = window.bufferHeight;
-        var buffer = window.buffer;
-
-        memcpy(ptr_, buffer, width * height * sizeof(Byte) * 4);
-
-        texture_.SetPixels32(pixels_);
-        texture_.Apply();
-    }
-}
-
+    }
+
+    void OnDestroy()
+    {
+        if (ptr_ != IntPtr.Zero) {
+            handle_.Free();
+        }
+    }
+
+    void Update()
+    {
+        if (!isValid) return;
+
+        var window = uwcTexture.window;
+        var width = window.width;
+        var height = window.height;
+
+        if (texture_ == null || width != texture_.width || height != texture_.height) {
+            texture_ = new Texture2D(width, height, TextureFormat.RGBA32, false);
+            texture_.filterMode = FilterMode.Bilinear;
+            pixels_ = texture_.GetPixels32();
+            handle_ = GCHandle.Alloc(pixels_, GCHandleType.Pinned);
+            ptr_ = handle_.AddrOfPinnedObject();
+            GetComponent<Renderer>().material.mainTexture = texture_;
+        }
+
+        // memcpy can be run in another thread. 
+        var buffer = window.buffer;
+        memcpy(ptr_, buffer, width * height * sizeof(Byte) * 4);
+
+        texture_.SetPixels32(pixels_);
+        texture_.Apply();
+    }
+}
+
 }

Assets/uWindowCapture/Examples/Buffer/UwcGetBufferExample.cs

@@ -37,7 +37,8 @@ void Update()
         var window = uwcTexture.window;
         if (window == null || window.bufferWidth == 0) return;
 
-        if (window.GetPixels(colors, x, y, w, h) /* this can be threaded */) {
+        // GetPixels() can be run in another thread
+        if (window.GetPixels(colors, x, y, w, h)) {
             texture.SetPixels32(colors);
             texture.Apply();
         }

Assets/uWindowCapture/Examples/GetPixels/UwcGetPixelsExample.cs

@@ -77,12 +77,12 @@ class Buffer
         return value_ != nullptr;
     }
 
-    const T operator [](UINT index) const
+    const T& operator [](UINT index) const
     {
         if (index >= size_)
         {
             Debug::Error("Array index out of range: ", index, size_);
-            return T(0);
+            return value_[0];
         }
         return value_[index];
     }

Assets/uWindowCapture/Plugins/x86/uWindowCapture.dll

@@ -348,7 +348,7 @@ bool WindowTexture::Upload()
 
         const UINT rawPitch = bufferWidth_ * 4;
         const int startIndex = offsetX_ * 4 + offsetY_ * rawPitch;
-        const auto* start = &buffer_[startIndex];
+        const auto* start = buffer_.Get(startIndex);
 
         ComPtr<ID3D11DeviceContext> context;
         uploader->GetDevice()->GetImmediateContext(&context);
@@ -386,9 +386,16 @@ bool WindowTexture::Render()
 }
 
 
-BYTE* WindowTexture::GetBuffer() const
+BYTE* WindowTexture::GetBuffer()
 {
-    return buffer_.Empty() ? nullptr : buffer_.Get();
+    if (buffer_.Empty()) return nullptr;
+
+    std::lock_guard<std::mutex> lock(bufferMutex_);
+
+    bufferForGetBuffer_.ExpandIfNeeded(buffer_.Size());
+    memcpy(bufferForGetBuffer_.Get(), buffer_.Get(), buffer_.Size());
+
+    return bufferForGetBuffer_.Get();
 }
 
 

Assets/uWindowCapture/Plugins/x86_64/uWindowCapture.dll

@@ -42,7 +42,7 @@ class WindowTexture
     bool Upload();
     bool Render();
 
-    BYTE* GetBuffer() const;
+    BYTE* GetBuffer();
 
     UINT GetPixel(int x, int y) const;
     bool GetPixels(BYTE* output, int x, int y, int width, int height) const;
@@ -60,6 +60,7 @@ class WindowTexture
     std::mutex sharedTextureMutex_;
 
     Buffer<BYTE> buffer_;
+    Buffer<BYTE> bufferForGetBuffer_;
     HBITMAP bitmap_ = nullptr;
     std::atomic<UINT> bufferWidth_ = 0;
     std::atomic<UINT> bufferHeight_ = 0;