Changed the aspect ratio settings to account for NTSC/PAL pixel aspect ratios and VI scaling.

Source/Core/Core/HW/VideoInterface.cpp

@@ -436,6 +436,57 @@ u32 GetXFBAddressBottom()
 		return m_XFBInfoBottom.FBB;
 }
 
+float GetAspectRatio(bool wide)
+{
+	u32 multiplier = static_cast<u32>(m_PictureConfiguration.STD / m_PictureConfiguration.WPL);
+	int height = (multiplier * m_VerticalTimingRegister.ACV);
+	int width = ((2 * m_HTiming0.HLW) - (m_HTiming0.HLW - m_HTiming1.HBS640)
+		- m_HTiming1.HBE640);
+	float pixelAR;
+	if (m_DisplayControlRegister.FMT == 1)
+	{
+		//PAL active frame is 702*576
+		//In square pixels, 1024*576 is 16:9, and 768*576 is 4:3
+		//Therefore a 16:9 TV would have a "pixel" aspect ratio of 1024/702
+		//Similarly a 4:3 TV would have a ratio of 768/702
+		if (wide)
+		{
+			pixelAR = 1024.0f / 702.0f;
+		}
+		else
+		{
+			pixelAR = 768.0f / 702.0f;
+		}
+	}
+	else
+	{
+		//NTSC active frame is 710.85*486
+		//In square pixels, 864*486 is 16:9, and 648*486 is 4:3
+		//Therefore a 16:9 TV would have a "pixel" aspect ratio of 864/710.85
+		//Similarly a 4:3 TV would have a ratio of 648/710.85
+		if (wide)
+		{
+			pixelAR = 864.0f / 710.85f;
+		}
+		else
+		{
+			pixelAR = 648.0f / 710.85f;
+		}
+	}
+	if (width == 0 || height == 0)
+	{
+		if (wide)
+		{
+			return 16.0f/9.0f;
+		}
+		else
+		{
+			return 4.0f/3.0f;
+		}
+	}
+	return ((float)width / (float)height) * pixelAR;
+}
+
 void UpdateParameters()
 {
 	fields = m_DisplayControlRegister.NIN ? 2 : 1;

Source/Core/Core/HW/VideoInterface.h

@@ -353,4 +353,7 @@ union UVIHorizontalStepping
 
 	unsigned int GetTicksPerLine();
 	unsigned int GetTicksPerFrame();
+
+	//For VI Scaling and Aspect Ratio Correction
+	float GetAspectRatio(bool);
 }