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1 files changed, 82 insertions, 0 deletions

diff --git a/indra/newview/llviewerlayer.cpp b/indra/newview/llviewerlayer.cpp
new file mode 100644
index 0000000000..a3ac9e0859
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+++ b/indra/newview/llviewerlayer.cpp
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+/** 
+ * @file llviewerlayer.cpp
+ * @brief LLViewerLayer class implementation
+ *
+ * Copyright (c) 2002-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#include "llviewerprecompiledheaders.h"
+
+#include "llviewerlayer.h"
+#include "llerror.h"
+#include "llmath.h"
+
+LLViewerLayer::LLViewerLayer(const S32 width, const F32 scale)
+{
+	mWidth = width;
+	mScale = scale;
+	mScaleInv = 1.f/scale;
+	mDatap = new F32[width*width];
+
+	for (S32 i = 0; i < width*width; i++)
+	{
+		*(mDatap + i) = 0.f;
+	}
+}
+
+LLViewerLayer::~LLViewerLayer()
+{
+	delete[] mDatap;
+	mDatap = NULL;
+}
+
+F32 LLViewerLayer::getValue(const S32 x, const S32 y) const
+{
+//	llassert(x >= 0);
+//	llassert(x < mWidth);
+//	llassert(y >= 0);
+//	llassert(y < mWidth);
+
+	return *(mDatap + x + y*mWidth);
+}
+
+F32 LLViewerLayer::getValueScaled(const F32 x, const F32 y) const
+{
+	S32 x1, x2, y1, y2;
+	F32 x_frac, y_frac;
+
+	x_frac = x*mScaleInv;
+	x1 = llfloor(x_frac);
+	x2 = x1 + 1;
+	x_frac -= x1;
+
+	y_frac = y*mScaleInv;
+	y1 = llfloor(y_frac);
+	y2 = y1 + 1;
+	y_frac -= y1;
+
+	x1 = llmin((S32)mWidth-1, x1);
+	x1 = llmax(0, x1);
+	x2 = llmin((S32)mWidth-1, x2);
+	x2 = llmax(0, x2);
+	y1 = llmin((S32)mWidth-1, y1);
+	y1 = llmax(0, y1);
+	y2 = llmin((S32)mWidth-1, y2);
+	y2 = llmax(0, y2);
+
+	// Take weighted average of all four points (bilinear interpolation)
+	S32 row1 = y1 * mWidth;
+	S32 row2 = y2 * mWidth;
+	
+	// Access in squential order in memory, and don't use immediately.
+	F32 row1_left  = mDatap[ row1 + x1 ];
+	F32 row1_right = mDatap[ row1 + x2 ];
+	F32 row2_left  = mDatap[ row2 + x1 ];
+	F32 row2_right = mDatap[ row2 + x2 ];
+	
+	F32 row1_interp = row1_left - x_frac * (row1_left - row1_right);
+	F32 row2_interp = row2_left - x_frac * (row2_left - row2_right);
+	
+	return row1_interp - y_frac * (row1_interp - row2_interp);
+}