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// Copyright (c) the JPEG XL Project Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "lib/jxl/enc_gaborish.h"
#include <hwy/base.h>
#include "lib/jxl/convolve.h"
#include "lib/jxl/image_ops.h"
#include "lib/jxl/image_test_utils.h"
#include "lib/jxl/testing.h"
namespace jxl {
namespace {
// weight1,2 need not be normalized.
WeightsSymmetric3 GaborishKernel(float weight1, float weight2) {
constexpr float weight0 = 1.0f;
// Normalize
const float mul = 1.0f / (weight0 + 4 * (weight1 + weight2));
const float w0 = weight0 * mul;
const float w1 = weight1 * mul;
const float w2 = weight2 * mul;
const WeightsSymmetric3 w = {{HWY_REP4(w0)}, {HWY_REP4(w1)}, {HWY_REP4(w2)}};
return w;
}
void ConvolveGaborish(const ImageF& in, float weight1, float weight2,
ThreadPool* pool, ImageF* JXL_RESTRICT out) {
JXL_CHECK(SameSize(in, *out));
Symmetric3(in, Rect(in), GaborishKernel(weight1, weight2), pool, out);
}
void TestRoundTrip(const Image3F& in, float max_l1) {
Image3F fwd(in.xsize(), in.ysize());
ThreadPool* null_pool = nullptr;
ConvolveGaborish(in.Plane(0), 0, 0, null_pool, &fwd.Plane(0));
ConvolveGaborish(in.Plane(1), 0, 0, null_pool, &fwd.Plane(1));
ConvolveGaborish(in.Plane(2), 0, 0, null_pool, &fwd.Plane(2));
float w = 0.92718927264540152f;
float weights[3] = {
w,
w,
w,
};
GaborishInverse(&fwd, weights, null_pool);
JXL_ASSERT_OK(VerifyRelativeError(in, fwd, max_l1, 1E-4f, _));
}
TEST(GaborishTest, TestZero) {
Image3F in(20, 20);
ZeroFillImage(&in);
TestRoundTrip(in, 0.0f);
}
// Disabled: large difference.
#if 0
TEST(GaborishTest, TestDirac) {
Image3F in(20, 20);
ZeroFillImage(&in);
in.PlaneRow(1, 10)[10] = 10.0f;
TestRoundTrip(in, 0.26f);
}
#endif
TEST(GaborishTest, TestFlat) {
Image3F in(20, 20);
FillImage(1.0f, &in);
TestRoundTrip(in, 1E-5f);
}
} // namespace
} // namespace jxl
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