From 3bf9df6b2785fa6d951086978a3e66f49427166a Mon Sep 17 00:00:00 2001
From: FluorescentCIAAfricanAmerican <0934gj3049fk@protonmail.com>
Date: Wed, 22 Apr 2020 12:56:21 -0400
Subject: 1

---
 common/jpegloader_common.cpp | 213 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 213 insertions(+)
 create mode 100644 common/jpegloader_common.cpp

(limited to 'common/jpegloader_common.cpp')

diff --git a/common/jpegloader_common.cpp b/common/jpegloader_common.cpp
new file mode 100644
index 0000000..c2e6fbb
--- /dev/null
+++ b/common/jpegloader_common.cpp
@@ -0,0 +1,213 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================
+
+#include "jpegloader.h"
+#include "tier0/dbg.h"
+#include "tier1/utlvector.h"
+#include "tier0/vprof.h"
+#include "jpeglib/jpeglib.h"
+
+//-----------------------------------------------------------------------------
+// Purpose: Takes a RGBA image buffer and resizes it using linear interpolation.
+//
+// Params: bufRGBA should contain the current image, nWidth and nHeight should describe
+// the current images dimensions.  nNewWidth and nNewHeight should be the new target size,
+// one, but not both, of these may be -1 which will indicate to preserve aspect ratio
+// and size that dimension to match the aspect ratio adjustment applied to the other
+// dimension which must then be specified explicitly.  nNewWidth and nNewHeight may
+// be modified by the function and will specify the final width/height after the 
+// function returns succesfully.  If both nNewWidth and nNewHeight are specified
+// the content will be scaled without changing the aspect ratio and black letterboxing
+// will be added if appropriate
+//-----------------------------------------------------------------------------
+bool BResizeImageInternal( CUtlBuffer &bufImage, int nWidth, int nHeight, int &nNewWidth, int &nNewHeight, bool bIsRGBA = true )
+{
+	VPROF_BUDGET( "BResizeImageRGBA", VPROF_BUDGETGROUP_OTHER_VGUI );
+	CUtlBuffer bufImageOut;
+
+	if ( nWidth == 0 || nHeight == 0 )
+		return false;
+
+	// Must specify at least one, then we'll compute the other to preserve aspect ratio if it's set to -1
+	if ( nNewWidth == - 1 && nNewHeight == -1 )
+		return false;
+
+	if ( nNewHeight == -1 )
+	{
+		float flAspect = (float)nNewWidth/(float)nWidth;
+		nNewHeight = (int)(flAspect*nHeight);
+	}
+	else if ( nNewWidth == -1 )
+	{
+		float flAspect = (float)nNewHeight/(float)nHeight;
+		nNewWidth =  (int)(flAspect*nWidth);
+	}
+
+	if ( nNewWidth == 0 || nNewHeight == 0 )
+		return false;
+
+	int nNewContentHeight = nNewHeight;
+	int nNewContentWidth = nNewWidth;
+
+	// Calculate the width/height of the actual content
+	if ( nWidth/(float)nHeight > nNewContentWidth/(float)nNewContentHeight )
+		nNewContentHeight = ( nNewContentWidth * nHeight )/nWidth;
+	else
+		nNewContentWidth = ( nNewContentHeight * nWidth )/nHeight;
+
+	int bytesPerPixel = bIsRGBA ? 4 : 3;
+
+	bufImageOut.EnsureCapacity( nNewWidth*nNewHeight*bytesPerPixel );
+	bufImageOut.SeekPut( CUtlBuffer::SEEK_HEAD, nNewWidth*nNewHeight*bytesPerPixel );
+
+
+	// Letterboxing
+	int nPaddingTop = (nNewHeight - nNewContentHeight)/2;
+	int nPaddingBottom = nNewHeight - nNewContentHeight - nPaddingTop;
+	int nPaddingLeft = (nNewWidth - nNewContentWidth)/2;
+	int nPaddingRight = nNewWidth - nNewContentWidth - nPaddingLeft;
+
+	Assert( nPaddingTop + nPaddingBottom + nNewContentHeight == nNewHeight );
+	Assert( nPaddingLeft + nPaddingRight + nNewContentWidth == nNewWidth );
+
+	if ( nPaddingLeft > 0 ||
+		nPaddingRight > 0 ||
+		nPaddingTop > 0 ||
+		nPaddingBottom > 0 )
+	{
+		Q_memset( bufImageOut.Base(), 0, nNewWidth*nNewHeight*bytesPerPixel );
+	}
+
+	byte *pBits = (byte*)bufImageOut.Base();
+
+	int nOriginalStride = nWidth;
+	int nTargetStride = nNewWidth;
+
+	float flXRatio = (float)(nWidth-1)/(float)nNewContentWidth;
+	float flYRatio = (float)(nHeight-1)/(float)nNewContentHeight;
+
+	byte *pSrcBits = (byte*)bufImage.Base();
+	for( int yNew=0; yNew<nNewContentHeight; ++yNew )
+	{
+		int y = (int)(flYRatio * yNew);
+		float yDiff = (flYRatio * yNew) - y;
+
+		for ( int xNew=0; xNew<nNewContentWidth; ++xNew )
+		{
+			int x = (int)(flXRatio * xNew);
+			float xDiff = (flXRatio * xNew) - x;
+
+			int aOffset = (x+(y*nOriginalStride))*bytesPerPixel;
+			int bOffset = aOffset+bytesPerPixel;
+			int cOffset = aOffset + (nOriginalStride*bytesPerPixel);
+			int dOffset = cOffset+bytesPerPixel;
+
+			byte red = (byte)(
+				pSrcBits[aOffset]*(1-xDiff)*(1-yDiff)
+				+pSrcBits[bOffset]*(xDiff)*(1-yDiff)
+				+pSrcBits[cOffset]*(yDiff)*(1-xDiff)
+				+pSrcBits[dOffset]*(xDiff)*(yDiff)
+				);
+
+			byte green = (byte)(
+				pSrcBits[aOffset+1]*(1-xDiff)*(1-yDiff)
+				+pSrcBits[bOffset+1]*(xDiff)*(1-yDiff)
+				+pSrcBits[cOffset+1]*(yDiff)*(1-xDiff)
+				+pSrcBits[dOffset+1]*(xDiff)*(yDiff)
+				);
+
+			byte blue = (byte)(
+				pSrcBits[aOffset+2]*(1-xDiff)*(1-yDiff)
+				+pSrcBits[bOffset+2]*(xDiff)*(1-yDiff)
+				+pSrcBits[cOffset+2]*(yDiff)*(1-xDiff)
+				+pSrcBits[dOffset+2]*(xDiff)*(yDiff)
+				);
+
+			byte alpha = 0;
+			if ( bytesPerPixel == 4 )
+			{
+				alpha = (byte)(
+					pSrcBits[aOffset+3]*(1-xDiff)*(1-yDiff)
+					+pSrcBits[bOffset+3]*(xDiff)*(1-yDiff)
+					+pSrcBits[cOffset+3]*(yDiff)*(1-xDiff)
+					+pSrcBits[dOffset+3]*(xDiff)*(yDiff)
+					);
+			}
+
+			int targetOffset = (nPaddingLeft+xNew+((nPaddingTop+yNew)*nTargetStride))*bytesPerPixel;
+
+			pBits[targetOffset] = red;
+			pBits[targetOffset+1] = green;
+			pBits[targetOffset+2] = blue;
+			if ( bytesPerPixel == 4 )
+				pBits[targetOffset+3] = alpha;
+		}
+	}
+	bufImage.Swap( bufImageOut );
+	return true;
+}
+
+// Resize an RGB image using linear interpolation
+bool BResizeImageRGB( CUtlBuffer &bufRGB, int nWidth, int nHeight, int &nNewWidth, int &nNewHeight )
+{
+	return BResizeImageInternal( bufRGB, nWidth, nHeight, nNewWidth, nNewHeight, false );
+}
+
+// Resize an RGBA image using linear interpolation
+bool BResizeImageRGBA( CUtlBuffer &bufRGB, int nWidth, int nHeight, int &nNewWidth, int &nNewHeight )
+{
+	return BResizeImageInternal( bufRGB, nWidth, nHeight, nNewWidth, nNewHeight, true );
+}
+
+// Convert an RGB image to RGBA with 100% opacity
+bool BConvertRGBToRGBA( CUtlBuffer &bufRGB, int nWidth, int nHeight )
+{
+	CUtlBuffer bufRGBA;
+	bufRGBA.EnsureCapacity( nWidth*nHeight*4 );
+	byte *pBits = (byte*)bufRGB.Base();
+	byte *pBitsOut = (byte*)bufRGBA.Base();
+
+	for( int y=0; y<nHeight; ++y )
+	{
+		for( int x=0; x<nWidth; ++x )
+		{
+			*pBitsOut = *pBits;
+			*(pBitsOut+1) = *(pBits+1);
+			*(pBitsOut+2) = *(pBits+2);
+			*(pBitsOut+3) = 255;
+
+			pBitsOut += 4;
+			pBits += 3;
+		}
+	}
+	bufRGB.Swap( bufRGBA );
+	return true;
+}
+
+// Convert an RGBA image to RGB using opacity against a given solid background
+bool BConvertRGBAToRGB( CUtlBuffer &bufRGBA, int nWidth, int nHeight, Color colorBG )
+{
+	CUtlBuffer bufRGB;
+	bufRGB.EnsureCapacity( nWidth*nHeight*3 );
+	byte *pBits = (byte*)bufRGBA.Base();
+	byte *pBitsOut = (byte*)bufRGB.Base();
+
+	for( int y=0; y<nHeight; ++y )
+	{
+		for( int x=0; x<nWidth; ++x )
+		{
+			float fOpacity = *(pBits+3) / 255.0;
+			*pBitsOut = *pBits * fOpacity + (1.0 - fOpacity) * colorBG.r();
+			*(pBitsOut+1) = *(pBits+1) * fOpacity + (1.0 - fOpacity) * colorBG.g();
+			*(pBitsOut+2) = *(pBits+2) * fOpacity + (1.0 - fOpacity) * colorBG.b();
+
+			pBitsOut += 3;
+			pBits += 4;
+		}
+	}
+	bufRGB.Swap( bufRGBA );
+	return true;
+}
\ No newline at end of file
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