34 lines
1.1 KiB
C++
34 lines
1.1 KiB
C++
#pragma once
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#include "Common/MathUtil.h"
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#include <cmath>
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namespace SW
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{
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// Modified from
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// http://tech-algorithm.com/articles/nearest-neighbor-image-scaling/
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template <typename T>
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void CopyRegion(const T* const source, const MathUtil::Rectangle<int>& srcrect, T* destination,
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const MathUtil::Rectangle<int>& dstrect)
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{
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double x_ratio = srcrect.GetWidth() / static_cast<double>(dstrect.GetWidth());
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double y_ratio = srcrect.GetHeight() / static_cast<double>(dstrect.GetHeight());
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for (int i = 0; i < dstrect.GetHeight(); i++)
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{
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for (int j = 0; j < dstrect.GetWidth(); j++)
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{
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int destination_x = j + dstrect.left;
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int destination_y = i + dstrect.top;
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int destination_offset = (destination_y * dstrect.GetWidth()) + destination_x;
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double src_x = std::round(destination_x * x_ratio) + srcrect.left;
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double src_y = std::round(destination_y * y_ratio) + srcrect.top;
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int src_offset = static_cast<int>((src_y * srcrect.GetWidth()) + src_x);
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destination[destination_offset] = source[src_offset];
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}
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}
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}
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}
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