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#include "Halide.h"
using namespace Halide;
namespace {
class Hello : public Generator<Hello> {
public:
Input<Buffer<uint8_t, 2>> input{"input"};
Output<Buffer<uint8_t, 2>> result{"result"};
void generate() {
tone_curve(x) = cast<int16_t>(pow(cast<float>(x) / 256.0f, 1.8f) * 256.0f);
Func clamped = BoundaryConditions::repeat_edge(input);
curved(x, y) = tone_curve(clamped(x, y));
Func sharper;
sharper(x, y) = 9 * curved(x, y) - 2 * (curved(x - 1, y) + curved(x + 1, y) + curved(x, y - 1) + curved(x, y + 1));
result(x, y) = cast<uint8_t>(clamp(sharper(x, y), 0, 255));
}
void schedule() {
Var yi;
tone_curve.compute_root();
result.split(y, y, yi, 60).vectorize(x, 8).parallel(y);
curved.store_at(result, y).compute_at(result, yi);
// We want to handle inputs that may be rotated 180 due to camera module placement.
// Unset the default stride constraint
input.dim(0).set_stride(Expr());
// Make specialized versions for input stride +/-1 to get dense vector loads
curved.specialize(input.dim(0).stride() == 1);
curved.specialize(input.dim(0).stride() == -1);
}
private:
Var x{"x"}, y{"y"};
Func tone_curve, curved;
};
} // namespace
HALIDE_REGISTER_GENERATOR(Hello, hello)
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