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Software Backend: Fix xfb output and add vertical scaling support

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This commit is contained in:
iwubcode
2017-08-23 21:46:23 -05:00
parent e6d85b0915
commit 6e686f6ea1
14 changed files with 179 additions and 117 deletions
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33
Source/Core/VideoBackends/Software/CopyRegion.h Normal file
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#pragma once
#include "Common/MathUtil.h"
#include <cmath>
namespace SW
{
// Modified from
// http://tech-algorithm.com/articles/nearest-neighbor-image-scaling/
template <typename T>
void copy_region(const T* const source, const MathUtil::Rectangle<int>& srcrect, T* destination,
const MathUtil::Rectangle<int>& dstrect)
{
double x_ratio = srcrect.GetWidth() / static_cast<double>(dstrect.GetWidth());
double y_ratio = srcrect.GetHeight() / static_cast<double>(dstrect.GetHeight());
for (int i = 0; i < dstrect.GetHeight(); i++)
{
for (int j = 0; j < dstrect.GetWidth(); j++)
{
int destination_x = j + dstrect.left;
int destination_y = i + dstrect.top;
int destination_offset = (destination_y * dstrect.GetWidth()) + destination_x;
double src_x = std::round(destination_x*x_ratio) + srcrect.left;
double src_y = std::round(destination_y*y_ratio) + srcrect.top;
int src_offset = static_cast<int>((src_y*srcrect.GetWidth()) + src_x);
destination[destination_offset] = source[src_offset];
}
}
}
}