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include/LiveScanClient/imageRenderer.h

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+//------------------------------------------------------------------------------
+// <copyright file="ImageRenderer.h" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+// Manages the drawing of image data
+
+#pragma once
+
+#include <d2d1.h>
+
+class ImageRenderer
+{
+public:
+    /// <summary>
+    /// Constructor
+    /// </summary>
+    ImageRenderer();
+
+    /// <summary>
+    /// Destructor
+    /// </summary>
+    virtual ~ImageRenderer();
+
+    /// <summary>
+    /// Set the window to draw to as well as the video format
+    /// Implied bits per pixel is 32
+    /// </summary>
+    /// <param name="hWnd">window to draw to</param>
+    /// <param name="pD2DFactory">already created D2D factory object</param>
+    /// <param name="sourceWidth">width (in pixels) of image data to be drawn</param>
+    /// <param name="sourceHeight">height (in pixels) of image data to be drawn</param>
+    /// <param name="sourceStride">length (in bytes) of a single scanline</param>
+    /// <returns>indicates success or failure</returns>
+    HRESULT Initialize(HWND hwnd, ID2D1Factory* pD2DFactory, int sourceWidth, int sourceHeight, int sourceStride);
+
+    /// <summary>
+    /// Draws a 32 bit per pixel image of previously specified width, height, and stride to the associated hwnd
+    /// </summary>
+    /// <param name="pImage">image data in RGBX format</param>
+    /// <param name="cbImage">size of image data in bytes</param>
+    /// <returns>indicates success or failure</returns>
+    HRESULT Draw(BYTE* pImage, unsigned long cbImage);
+
+private:
+    HWND                     m_hWnd;
+
+    // Format information
+    UINT                     m_sourceHeight;
+    UINT                     m_sourceWidth;
+    LONG                     m_sourceStride;
+
+     // Direct2D 
+    ID2D1Factory*            m_pD2DFactory;
+    ID2D1HwndRenderTarget*   m_pRenderTarget;
+    ID2D1Bitmap*             m_pBitmap;
+
+    /// <summary>
+    /// Ensure necessary Direct2d resources are created
+    /// </summary>
+    /// <returns>indicates success or failure</returns>
+    HRESULT EnsureResources();
+
+    /// <summary>
+    /// Dispose of Direct2d resources 
+    /// </summary>
+    void DiscardResources();
+};