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058c7db80b
Fixes issue 11393. The problem is that left and top make no sense for a width by height array; they only make sense in a larger array where from which a smaller part is extracted. Thus, the overall size of the array is provided to CopyRegion in addition to the sub-region. EncodeXFB already handles the extraction, so CopyRegion's only use there is to resize the image (and thus no sub-region is provided).
53 lines
2 KiB
C++
53 lines
2 KiB
C++
#pragma once
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#include "Common/Assert.h"
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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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// Copies a region of source to a region of destination, performing nearest-neighbor rescaling
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template <typename T>
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void CopyRegion(const T* const source, const MathUtil::Rectangle<int>& srcrect, const int src_width,
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const int src_height, T* destination, const MathUtil::Rectangle<int>& dstrect,
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const int dst_width, const int dst_height)
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{
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ASSERT(srcrect.top >= 0 && srcrect.bottom <= src_height);
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ASSERT(srcrect.left >= 0 && srcrect.right <= src_width);
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ASSERT(dstrect.top >= 0 && dstrect.bottom <= dst_height);
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ASSERT(dstrect.left >= 0 && dstrect.right <= dst_width);
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int copy_width = dstrect.GetWidth();
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int copy_height = dstrect.GetHeight();
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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 y_off = 0; y_off < copy_height; y_off++)
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{
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for (int x_off = 0; x_off < copy_width; x_off++)
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{
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int dst_x = dstrect.left + x_off;
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int dst_y = dstrect.top + y_off;
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int dst_offset = (dst_y * dst_width) + dst_x;
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int src_x = srcrect.left + static_cast<int>(std::round(x_off * x_ratio));
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int src_y = srcrect.top + static_cast<int>(std::round(y_off * y_ratio));
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int src_offset = (src_y * src_width) + src_x;
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destination[dst_offset] = source[src_offset];
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}
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}
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}
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// Copies the entire image from source to destination, performing nearest-neighbor rescaling
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template <typename T>
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void CopyRegion(const T* const source, const int src_width, const int src_height, T* destination,
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const int dst_width, const int dst_height)
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{
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MathUtil::Rectangle<int> srcrect{0, 0, src_width, src_height};
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MathUtil::Rectangle<int> dstrect{0, 0, dst_width, dst_height};
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CopyRegion(source, srcrect, src_width, src_height, destination, dstrect, dst_width, dst_height);
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}
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} // namespace SW
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