54 lines
2.0 KiB
C++
54 lines
2.0 KiB
C++
#pragma once
|
|
|
|
#include "Common/Assert.h"
|
|
#include "Common/MathUtil.h"
|
|
|
|
#include <cmath>
|
|
|
|
namespace SW
|
|
{
|
|
// Copies a region of source to a region of destination, performing nearest-neighbor rescaling
|
|
template <typename T>
|
|
void CopyRegion(const T* const source, const MathUtil::Rectangle<int>& srcrect, const int src_width,
|
|
const int src_height, T* destination, const MathUtil::Rectangle<int>& dstrect,
|
|
const int dst_width, const int dst_height)
|
|
{
|
|
ASSERT(srcrect.top >= 0 && srcrect.bottom <= src_height);
|
|
ASSERT(srcrect.left >= 0 && srcrect.right <= src_width);
|
|
ASSERT(dstrect.top >= 0 && dstrect.bottom <= dst_height);
|
|
ASSERT(dstrect.left >= 0 && dstrect.right <= dst_width);
|
|
|
|
int copy_width = dstrect.GetWidth();
|
|
int copy_height = dstrect.GetHeight();
|
|
|
|
double x_ratio = srcrect.GetWidth() / static_cast<double>(dstrect.GetWidth());
|
|
double y_ratio = srcrect.GetHeight() / static_cast<double>(dstrect.GetHeight());
|
|
|
|
for (int y_off = 0; y_off < copy_height; y_off++)
|
|
{
|
|
for (int x_off = 0; x_off < copy_width; x_off++)
|
|
{
|
|
int dst_x = dstrect.left + x_off;
|
|
int dst_y = dstrect.top + y_off;
|
|
int dst_offset = (dst_y * dst_width) + dst_x;
|
|
|
|
int src_x = srcrect.left + static_cast<int>(std::round(x_off * x_ratio));
|
|
int src_y = srcrect.top + static_cast<int>(std::round(y_off * y_ratio));
|
|
int src_offset = (src_y * src_width) + src_x;
|
|
|
|
destination[dst_offset] = source[src_offset];
|
|
}
|
|
}
|
|
}
|
|
|
|
// Copies the entire image from source to destination, performing nearest-neighbor rescaling
|
|
template <typename T>
|
|
void CopyRegion(const T* const source, const int src_width, const int src_height, T* destination,
|
|
const int dst_width, const int dst_height)
|
|
{
|
|
MathUtil::Rectangle<int> srcrect{0, 0, src_width, src_height};
|
|
MathUtil::Rectangle<int> dstrect{0, 0, dst_width, dst_height};
|
|
CopyRegion(source, srcrect, src_width, src_height, destination, dstrect, dst_width, dst_height);
|
|
}
|
|
} // namespace SW
|