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Minor tweaks to xbrz performance

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This commit is contained in:
Ivan Savenko
2024-12-23 13:59:09 +00:00
parent 1caab5100a
commit 814234017d
2 changed files with 16 additions and 9 deletions
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23
client/renderSDL/SDL_Extensions.cpp
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@@ -671,10 +671,6 @@ SDL_Surface * CSDL_Ext::scaleSurfaceIntegerFactor(SDL_Surface * surf, int factor
const uint32_t * srcPixels = static_cast<const uint32_t*>(intermediate->pixels);
uint32_t * dstPixels = static_cast<uint32_t*>(ret->pixels);
// avoid excessive granulation - xBRZ prefers at least 8-16 lines per task
// TODO: compare performance and size of images, recheck values for potentially better parameters
const int granulation = std::clamp(surf->h / 64 * 8, 8, 64);
switch (algorithm)
{
case EScalingAlgorithm::NEAREST:
@@ -687,11 +683,22 @@ SDL_Surface * CSDL_Ext::scaleSurfaceIntegerFactor(SDL_Surface * surf, int factor
case EScalingAlgorithm::XBRZ_OPAQUE:
{
auto format = algorithm == EScalingAlgorithm::XBRZ_OPAQUE ? xbrz::ColorFormat::ARGB_CLAMPED : xbrz::ColorFormat::ARGB;
tbb::parallel_for(tbb::blocked_range<size_t>(0, intermediate->h, granulation), [factor, srcPixels, dstPixels, intermediate, format](const tbb::blocked_range<size_t> & r)
{
xbrz::scale(factor, srcPixels, dstPixels, intermediate->w, intermediate->h, format, {}, r.begin(), r.end());
});
if(intermediate->h < 32)
{
// for tiny images tbb incurs too high overhead
xbrz::scale(factor, srcPixels, dstPixels, intermediate->w, intermediate->h, format, {});
}
else
{
// xbrz recommends granulation of 16, but according to tests, for smaller images granulation of 4 is actually the best option
const int granulation = intermediate->h > 400 ? 16 : 4;
tbb::parallel_for(tbb::blocked_range<size_t>(0, intermediate->h, granulation), [factor, srcPixels, dstPixels, intermediate, format](const tbb::blocked_range<size_t> & r)
{
xbrz::scale(factor, srcPixels, dstPixels, intermediate->w, intermediate->h, format, {}, r.begin(), r.end());
});
}
break;
}
default: