1. 打开 vxtPLDisplay 工程

   修改 vxtPLImage.cpp，修改下面函数

void vxtPLImageContext_OpenGLTexture::SingleTexture::vDrawImage
(
   const vxtRRegion   &a_rDest,
   const vxtColorRGBA &a_rColor
) const
{
   VXT_START_PERFORMANCE_TIMER(pGetImageStat());

   VXT_PRE(m_rContext.IsActive());
   VXT_PRE( (VXT_RT_GEOMETRY_MIN <= a_rDest.Lt) && (a_rDest.Lt <= VXT_RT_GEOMETRY_MAX) );
   VXT_PRE( (VXT_RT_GEOMETRY_MIN <= a_rDest.Rt) && (a_rDest.Rt <= VXT_RT_GEOMETRY_MAX) );
   VXT_PRE( (VXT_RT_GEOMETRY_MIN <= a_rDest.Bm) && (a_rDest.Bm <= VXT_RT_GEOMETRY_MAX) );
   VXT_PRE( (VXT_RT_GEOMETRY_MIN <= a_rDest.Tp) && (a_rDest.Tp <= VXT_RT_GEOMETRY_MAX) );

   VXT_TRACE("vxtPLImage", "vDrawImage");
   VXT_TRACE_RREGION("vxtPLImage", "a_rDest", a_rDest);
   VXT_TRACE_COLOR("vxtPLImage", "a_rColor", a_rColor);

   vxtPLGraphicsImpl &rGraphics = m_rContext.rGetActiveGraphics();

#if 1
   memset(g_pMemRenderTarget, 0, 512 * 512 * 3);
   static int n = 0;
   int r, g, b;
   if (n < 3)
   {
	   r = 255;
	   g = 0;
	   b = 0;
   }
   else if(n < 6)
   {
	   r = 0;
	   g = 255;
	   b = 0;
   }
   else if(n < 9)
   {
	   r = 0;
	   g = 0;
	   b = 255;
   }
   n++;
   if (n >= 9)
	   n = 0;
   for (int i = 0; i < 512 * 512 * 3; i++)
   {
	   if (i % 3 == 0)
		   g_pMemRenderTarget[i] = r;
	   else if (i % 3 == 1)
		   g_pMemRenderTarget[i] = g;
	   else if (i % 3 == 2)
		   g_pMemRenderTarget[i] = b;
   }

#endif

   if(rGraphics.IsTopMatrixValid()) // INLINE-BRANCH
   {
      vPrepareToDraw();
	
      rGraphics.vDisablePattern(); // INLINE-BRANCH
      rGraphics.vSetColorRGBA(a_rColor);

	  if (a_rColor.A == CREATE_VIDEO_IMAGE_1 && g_pMemRenderTarget != NULL)
	  {
		  vxtColorRGBA ImageColor = { a_rColor.R, a_rColor.G, a_rColor.B, 255 };
		  rGraphics.vSetColorRGBA(ImageColor);
		  glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 512, 512, GL_RGB, GL_UNSIGNED_BYTE, g_pMemRenderTarget);
	  }

      glBegin(GL_TRIANGLE_FAN);

      glMultiTexCoord2f(GL_TEXTURE0, 0.0F, 0.0F);
      rGraphics.vVertex2f(a_rDest.Lt, a_rDest.Tp); //vertically-flipped

      glMultiTexCoord2f(GL_TEXTURE0, 0.0F, m_TexFactor.Y);
      rGraphics.vVertex2f(a_rDest.Lt, a_rDest.Bm); //vertically-flipped

      glMultiTexCoord2f(GL_TEXTURE0, m_TexFactor.X, m_TexFactor.Y);
      rGraphics.vVertex2f(a_rDest.Rt, a_rDest.Bm); //vertically-flipped

      glMultiTexCoord2f(GL_TEXTURE0, m_TexFactor.X, 0.0F);
      rGraphics.vVertex2f(a_rDest.Rt, a_rDest.Tp); //vertically-flipped

      glEnd();
   }
}

   增加下面代码，在SingleTexture的构造函数和析构函数里调用下面两个函数

#define CREATE_VIDEO_IMAGE_1 50
unsigned char *g_pMemRenderTarget = NULL;
HANDLE g_hMemRenderTarget = NULL;

void CreateRenderTargetShareMemory(int size, TCHAR* name)
{
	static bool bFirst = false;
	if(bFirst == true)
		return;
	g_hMemRenderTarget = CreateFileMapping((HANDLE)0xffffffffffffffff,
		NULL,
		PAGE_READWRITE,
		0,
		size,
		name);
	g_pMemRenderTarget = (unsigned char *)MapViewOfFile(g_hMemRenderTarget, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, 0);
	bFirst = true;
}

void FreeShareMemory()
{
	static bool bFirst = false;
	if(bFirst == true)
		return;
	UnmapViewOfFile(g_pMemRenderTarget);
	CloseHandle(g_hMemRenderTarget);
	bFirst = true;
}

2.打开vxtCLImage工程，修改vxtCLImage.cpp

   修改下面函数

void vxtClsImage::vDraw(vxtRTDrawMode & a_rMode)
{
#if VXT_CGRUNTIME_MODE
   VXT_PRE_GROBJECT_VDRAW_PARAM_PRECONDITION;
   VXT_PRE(IsVisible());
   /// @pre This function must only be called from functions of ::vxtRTDrawMode.
#endif

   if( 0 != mp_AlphaValue )
   {
      vxtPLGraphics& rGraphics = a_rMode.rGetGraphics();

      const vxtRTImage &rImage = mp_Index->rGetImage();

      if(rImage.IsAllocated())
      {
         vxtColorRGBA ImageColor = { VXT_MAX_PIXEL_LEVEL, 
                                     VXT_MAX_PIXEL_LEVEL,
                                     VXT_MAX_PIXEL_LEVEL,
                                     mp_AlphaValue };

         //--------------------------------------------------------------------
         // Coding Standard Deviation: MISRA C++ 2008 6-2-2 
         // Description: Floating-point expressions shall not be directly or 
         //              indirectly tested for equality or inequality. 
         // Rationale: Direct equality test is used as a fast way to single 
         //            out and optimize the most-used no-rotation case.
         //--------------------------------------------------------------------
         // PRQA S 3270 1 
         if (0.0F == mp_RotationAngle)
         {
            vxtRCoord Point1 = {mp_Position.GetFieldX(), mp_Position.GetFieldY()};

            // SCS.LAN.EXPR.ARITH.ERROR
            // DC1.RT.GENERAL.EXTENT_LIMIT.01 impose all graphics to be located 
            // inside the maximum extent bounding box (+- VXT_RT_GEOMETRY_MAX), 
            // therefore limiting the values of mp_Position and mp_Size to that range.
            // Adding two floats in that interval cannot overflow.
            vxtRCoord Point2 = {mp_Position.GetFieldX() + mp_Size.GetFieldX(),
                                mp_Position.GetFieldY() + mp_Size.GetFieldY() };


			rGraphics.vDrawImage(rImage, Point1, Point2, ImageColor);

			if(mp_AlphaValue == CREATE_VIDEO_IMAGE_1)
				vRequireUpdate();
         }
         else
         {
            // General case of drawing a rotated image
            vxtRCoord Zero = { 0.0F, 0.0F};
            vxtRCoord Size = { mp_Size.GetFieldX(), mp_Size.GetFieldY() };

            rGraphics.vPushTrans();

            rGraphics.vTranslate(mp_Position.GetFieldX(), mp_Position.GetFieldY());

            rGraphics.vRotate(mp_RotationAngle);

            rGraphics.vDrawImage(rImage, Zero, Size, ImageColor);

            rGraphics.vPopTrans();
         }
      }
   }
}

void vxtClsImage::vUpdate(const vxtRTTopContext & a_rTopContext)
{
   vFixSizeIfNeeded(a_rTopContext, VXT_FALSE);
   if (mp_AlphaValue == CREATE_VIDEO_IMAGE_1)
		vRequireDraw(a_rTopContext);
}

增加下面代码

#define CREATE_VIDEO_IMAGE_1 50

3. 用windows自带的画图板随便建立一张574*574的24位bmp图片

   修改vaps xt里，image控件的默认图片