From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- third_party/jpeg-xl/lib/jpegli/idct.cc | 692 +++++++++++++++++++++++++++++++++ 1 file changed, 692 insertions(+) create mode 100644 third_party/jpeg-xl/lib/jpegli/idct.cc (limited to 'third_party/jpeg-xl/lib/jpegli/idct.cc') diff --git a/third_party/jpeg-xl/lib/jpegli/idct.cc b/third_party/jpeg-xl/lib/jpegli/idct.cc new file mode 100644 index 0000000000..4d10563583 --- /dev/null +++ b/third_party/jpeg-xl/lib/jpegli/idct.cc @@ -0,0 +1,692 @@ +// 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/jpegli/idct.h" + +#include + +#include "lib/jpegli/decode_internal.h" +#include "lib/jxl/base/status.h" + +#undef HWY_TARGET_INCLUDE +#define HWY_TARGET_INCLUDE "lib/jpegli/idct.cc" +#include +#include + +#include "lib/jpegli/transpose-inl.h" + +HWY_BEFORE_NAMESPACE(); +namespace jpegli { +namespace HWY_NAMESPACE { + +// These templates are not found via ADL. +using hwy::HWY_NAMESPACE::Abs; +using hwy::HWY_NAMESPACE::Add; +using hwy::HWY_NAMESPACE::Gt; +using hwy::HWY_NAMESPACE::IfThenElseZero; +using hwy::HWY_NAMESPACE::Mul; +using hwy::HWY_NAMESPACE::MulAdd; +using hwy::HWY_NAMESPACE::NegMulAdd; +using hwy::HWY_NAMESPACE::Rebind; +using hwy::HWY_NAMESPACE::Sub; +using hwy::HWY_NAMESPACE::Vec; +using hwy::HWY_NAMESPACE::Xor; + +using D = HWY_FULL(float); +using DI = HWY_FULL(int32_t); +constexpr D d; +constexpr DI di; + +using D8 = HWY_CAPPED(float, 8); +constexpr D8 d8; + +void DequantBlock(const int16_t* JXL_RESTRICT qblock, + const float* JXL_RESTRICT dequant, + const float* JXL_RESTRICT biases, float* JXL_RESTRICT block) { + for (size_t k = 0; k < 64; k += Lanes(d)) { + const auto mul = Load(d, dequant + k); + const auto bias = Load(d, biases + k); + const Rebind di16; + const Vec quant_i = PromoteTo(di, Load(di16, qblock + k)); + const Rebind df; + const auto quant = ConvertTo(df, quant_i); + const auto abs_quant = Abs(quant); + const auto not_0 = Gt(abs_quant, Zero(df)); + const auto sign_quant = Xor(quant, abs_quant); + const auto biased_quant = Sub(quant, Xor(bias, sign_quant)); + const auto dequant = IfThenElseZero(not_0, Mul(biased_quant, mul)); + Store(dequant, d, block + k); + } +} + +template +void ForwardEvenOdd(const float* JXL_RESTRICT ain, size_t ain_stride, + float* JXL_RESTRICT aout) { + for (size_t i = 0; i < N / 2; i++) { + auto in1 = LoadU(d8, ain + 2 * i * ain_stride); + Store(in1, d8, aout + i * 8); + } + for (size_t i = N / 2; i < N; i++) { + auto in1 = LoadU(d8, ain + (2 * (i - N / 2) + 1) * ain_stride); + Store(in1, d8, aout + i * 8); + } +} + +template +void BTranspose(float* JXL_RESTRICT coeff) { + for (size_t i = N - 1; i > 0; i--) { + auto in1 = Load(d8, coeff + i * 8); + auto in2 = Load(d8, coeff + (i - 1) * 8); + Store(Add(in1, in2), d8, coeff + i * 8); + } + constexpr float kSqrt2 = 1.41421356237f; + auto sqrt2 = Set(d8, kSqrt2); + auto in1 = Load(d8, coeff); + Store(Mul(in1, sqrt2), d8, coeff); +} + +// Constants for DCT implementation. Generated by the following snippet: +// for i in range(N // 2): +// print(1.0 / (2 * math.cos((i + 0.5) * math.pi / N)), end=", ") +template +struct WcMultipliers; + +template <> +struct WcMultipliers<4> { + static constexpr float kMultipliers[] = { + 0.541196100146197, + 1.3065629648763764, + }; +}; + +template <> +struct WcMultipliers<8> { + static constexpr float kMultipliers[] = { + 0.5097955791041592, + 0.6013448869350453, + 0.8999762231364156, + 2.5629154477415055, + }; +}; + +constexpr float WcMultipliers<4>::kMultipliers[]; +constexpr float WcMultipliers<8>::kMultipliers[]; + +template +void MultiplyAndAdd(const float* JXL_RESTRICT coeff, float* JXL_RESTRICT out, + size_t out_stride) { + for (size_t i = 0; i < N / 2; i++) { + auto mul = Set(d8, WcMultipliers::kMultipliers[i]); + auto in1 = Load(d8, coeff + i * 8); + auto in2 = Load(d8, coeff + (N / 2 + i) * 8); + auto out1 = MulAdd(mul, in2, in1); + auto out2 = NegMulAdd(mul, in2, in1); + StoreU(out1, d8, out + i * out_stride); + StoreU(out2, d8, out + (N - i - 1) * out_stride); + } +} + +template +struct IDCT1DImpl; + +template <> +struct IDCT1DImpl<1> { + JXL_INLINE void operator()(const float* from, size_t from_stride, float* to, + size_t to_stride) { + StoreU(LoadU(d8, from), d8, to); + } +}; + +template <> +struct IDCT1DImpl<2> { + JXL_INLINE void operator()(const float* from, size_t from_stride, float* to, + size_t to_stride) { + JXL_DASSERT(from_stride >= 8); + JXL_DASSERT(to_stride >= 8); + auto in1 = LoadU(d8, from); + auto in2 = LoadU(d8, from + from_stride); + StoreU(Add(in1, in2), d8, to); + StoreU(Sub(in1, in2), d8, to + to_stride); + } +}; + +template +struct IDCT1DImpl { + void operator()(const float* from, size_t from_stride, float* to, + size_t to_stride) { + JXL_DASSERT(from_stride >= 8); + JXL_DASSERT(to_stride >= 8); + HWY_ALIGN float tmp[64]; + ForwardEvenOdd(from, from_stride, tmp); + IDCT1DImpl()(tmp, 8, tmp, 8); + BTranspose(tmp + N * 4); + IDCT1DImpl()(tmp + N * 4, 8, tmp + N * 4, 8); + MultiplyAndAdd(tmp, to, to_stride); + } +}; + +template +void IDCT1D(float* JXL_RESTRICT from, float* JXL_RESTRICT output, + size_t output_stride) { + for (size_t i = 0; i < 8; i += Lanes(d8)) { + IDCT1DImpl()(from + i, 8, output + i, output_stride); + } +} + +void ComputeScaledIDCT(float* JXL_RESTRICT block0, float* JXL_RESTRICT block1, + float* JXL_RESTRICT output, size_t output_stride) { + Transpose8x8Block(block0, block1); + IDCT1D<8>(block1, block0, 8); + Transpose8x8Block(block0, block1); + IDCT1D<8>(block1, output, output_stride); +} + +void InverseTransformBlock8x8(const int16_t* JXL_RESTRICT qblock, + const float* JXL_RESTRICT dequant, + const float* JXL_RESTRICT biases, + float* JXL_RESTRICT scratch_space, + float* JXL_RESTRICT output, size_t output_stride, + size_t dctsize) { + float* JXL_RESTRICT block0 = scratch_space; + float* JXL_RESTRICT block1 = scratch_space + DCTSIZE2; + DequantBlock(qblock, dequant, biases, block0); + ComputeScaledIDCT(block0, block1, output, output_stride); +} + +// Computes the N-point IDCT of in[], and stores the result in out[]. The in[] +// array is at most 8 values long, values in[8:N-1] are assumed to be 0. +void Compute1dIDCT(float* in, float* out, size_t N) { + switch (N) { + case 3: { + static constexpr float kC3[3] = { + 1.414213562373, + 1.224744871392, + 0.707106781187, + }; + float even0 = in[0] + kC3[2] * in[2]; + float even1 = in[0] - kC3[0] * in[2]; + float odd0 = kC3[1] * in[1]; + out[0] = even0 + odd0; + out[2] = even0 - odd0; + out[1] = even1; + break; + } + case 5: { + static constexpr float kC5[5] = { + 1.414213562373, 1.344997023928, 1.144122805635, + 0.831253875555, 0.437016024449, + }; + float even0 = in[0] + kC5[2] * in[2] + kC5[4] * in[4]; + float even1 = in[0] - kC5[4] * in[2] - kC5[2] * in[4]; + float even2 = in[0] - kC5[0] * in[2] + kC5[0] * in[4]; + float odd0 = kC5[1] * in[1] + kC5[3] * in[3]; + float odd1 = kC5[3] * in[1] - kC5[1] * in[3]; + out[0] = even0 + odd0; + out[4] = even0 - odd0; + out[1] = even1 + odd1; + out[3] = even1 - odd1; + out[2] = even2; + break; + } + case 6: { + static constexpr float kC6[6] = { + 1.414213562373, 1.366025403784, 1.224744871392, + 1.000000000000, 0.707106781187, 0.366025403784, + }; + float even0 = in[0] + kC6[2] * in[2] + kC6[4] * in[4]; + float even1 = in[0] - kC6[0] * in[4]; + float even2 = in[0] - kC6[2] * in[2] + kC6[4] * in[4]; + float odd0 = kC6[1] * in[1] + kC6[3] * in[3] + kC6[5] * in[5]; + float odd1 = kC6[3] * in[1] - kC6[3] * in[3] - kC6[3] * in[5]; + float odd2 = kC6[5] * in[1] - kC6[3] * in[3] + kC6[1] * in[5]; + out[0] = even0 + odd0; + out[5] = even0 - odd0; + out[1] = even1 + odd1; + out[4] = even1 - odd1; + out[2] = even2 + odd2; + out[3] = even2 - odd2; + break; + } + case 7: { + static constexpr float kC7[7] = { + 1.414213562373, 1.378756275744, 1.274162392264, 1.105676685997, + 0.881747733790, 0.613604268353, 0.314692122713, + }; + float even0 = in[0] + kC7[2] * in[2] + kC7[4] * in[4] + kC7[6] * in[6]; + float even1 = in[0] + kC7[6] * in[2] - kC7[2] * in[4] - kC7[4] * in[6]; + float even2 = in[0] - kC7[4] * in[2] - kC7[6] * in[4] + kC7[2] * in[6]; + float even3 = in[0] - kC7[0] * in[2] + kC7[0] * in[4] - kC7[0] * in[6]; + float odd0 = kC7[1] * in[1] + kC7[3] * in[3] + kC7[5] * in[5]; + float odd1 = kC7[3] * in[1] - kC7[5] * in[3] - kC7[1] * in[5]; + float odd2 = kC7[5] * in[1] - kC7[1] * in[3] + kC7[3] * in[5]; + out[0] = even0 + odd0; + out[6] = even0 - odd0; + out[1] = even1 + odd1; + out[5] = even1 - odd1; + out[2] = even2 + odd2; + out[4] = even2 - odd2; + out[3] = even3; + break; + } + case 9: { + static constexpr float kC9[9] = { + 1.414213562373, 1.392728480640, 1.328926048777, + 1.224744871392, 1.083350440839, 0.909038955344, + 0.707106781187, 0.483689525296, 0.245575607938, + }; + float even0 = in[0] + kC9[2] * in[2] + kC9[4] * in[4] + kC9[6] * in[6]; + float even1 = in[0] + kC9[6] * in[2] - kC9[6] * in[4] - kC9[0] * in[6]; + float even2 = in[0] - kC9[8] * in[2] - kC9[2] * in[4] + kC9[6] * in[6]; + float even3 = in[0] - kC9[4] * in[2] + kC9[8] * in[4] + kC9[6] * in[6]; + float even4 = in[0] - kC9[0] * in[2] + kC9[0] * in[4] - kC9[0] * in[6]; + float odd0 = + kC9[1] * in[1] + kC9[3] * in[3] + kC9[5] * in[5] + kC9[7] * in[7]; + float odd1 = kC9[3] * in[1] - kC9[3] * in[5] - kC9[3] * in[7]; + float odd2 = + kC9[5] * in[1] - kC9[3] * in[3] - kC9[7] * in[5] + kC9[1] * in[7]; + float odd3 = + kC9[7] * in[1] - kC9[3] * in[3] + kC9[1] * in[5] - kC9[5] * in[7]; + out[0] = even0 + odd0; + out[8] = even0 - odd0; + out[1] = even1 + odd1; + out[7] = even1 - odd1; + out[2] = even2 + odd2; + out[6] = even2 - odd2; + out[3] = even3 + odd3; + out[5] = even3 - odd3; + out[4] = even4; + break; + } + case 10: { + static constexpr float kC10[10] = { + 1.414213562373, 1.396802246667, 1.344997023928, 1.260073510670, + 1.144122805635, 1.000000000000, 0.831253875555, 0.642039521920, + 0.437016024449, 0.221231742082, + }; + float even0 = in[0] + kC10[2] * in[2] + kC10[4] * in[4] + kC10[6] * in[6]; + float even1 = in[0] + kC10[6] * in[2] - kC10[8] * in[4] - kC10[2] * in[6]; + float even2 = in[0] - kC10[0] * in[4]; + float even3 = in[0] - kC10[6] * in[2] - kC10[8] * in[4] + kC10[2] * in[6]; + float even4 = in[0] - kC10[2] * in[2] + kC10[4] * in[4] - kC10[6] * in[6]; + float odd0 = + kC10[1] * in[1] + kC10[3] * in[3] + kC10[5] * in[5] + kC10[7] * in[7]; + float odd1 = + kC10[3] * in[1] + kC10[9] * in[3] - kC10[5] * in[5] - kC10[1] * in[7]; + float odd2 = + kC10[5] * in[1] - kC10[5] * in[3] - kC10[5] * in[5] + kC10[5] * in[7]; + float odd3 = + kC10[7] * in[1] - kC10[1] * in[3] + kC10[5] * in[5] + kC10[9] * in[7]; + float odd4 = + kC10[9] * in[1] - kC10[7] * in[3] + kC10[5] * in[5] - kC10[3] * in[7]; + out[0] = even0 + odd0; + out[9] = even0 - odd0; + out[1] = even1 + odd1; + out[8] = even1 - odd1; + out[2] = even2 + odd2; + out[7] = even2 - odd2; + out[3] = even3 + odd3; + out[6] = even3 - odd3; + out[4] = even4 + odd4; + out[5] = even4 - odd4; + break; + } + case 11: { + static constexpr float kC11[11] = { + 1.414213562373, 1.399818907436, 1.356927976287, 1.286413904599, + 1.189712155524, 1.068791297809, 0.926112931411, 0.764581576418, + 0.587485545401, 0.398430002847, 0.201263574413, + }; + float even0 = in[0] + kC11[2] * in[2] + kC11[4] * in[4] + kC11[6] * in[6]; + float even1 = + in[0] + kC11[6] * in[2] - kC11[10] * in[4] - kC11[4] * in[6]; + float even2 = + in[0] + kC11[10] * in[2] - kC11[2] * in[4] - kC11[8] * in[6]; + float even3 = in[0] - kC11[8] * in[2] - kC11[6] * in[4] + kC11[2] * in[6]; + float even4 = + in[0] - kC11[4] * in[2] + kC11[8] * in[4] + kC11[10] * in[6]; + float even5 = in[0] - kC11[0] * in[2] + kC11[0] * in[4] - kC11[0] * in[6]; + float odd0 = + kC11[1] * in[1] + kC11[3] * in[3] + kC11[5] * in[5] + kC11[7] * in[7]; + float odd1 = + kC11[3] * in[1] + kC11[9] * in[3] - kC11[7] * in[5] - kC11[1] * in[7]; + float odd2 = + kC11[5] * in[1] - kC11[7] * in[3] - kC11[3] * in[5] + kC11[9] * in[7]; + float odd3 = + kC11[7] * in[1] - kC11[1] * in[3] + kC11[9] * in[5] + kC11[5] * in[7]; + float odd4 = + kC11[9] * in[1] - kC11[5] * in[3] + kC11[1] * in[5] - kC11[3] * in[7]; + out[0] = even0 + odd0; + out[10] = even0 - odd0; + out[1] = even1 + odd1; + out[9] = even1 - odd1; + out[2] = even2 + odd2; + out[8] = even2 - odd2; + out[3] = even3 + odd3; + out[7] = even3 - odd3; + out[4] = even4 + odd4; + out[6] = even4 - odd4; + out[5] = even5; + break; + } + case 12: { + static constexpr float kC12[12] = { + 1.414213562373, 1.402114769300, 1.366025403784, 1.306562964876, + 1.224744871392, 1.121971053594, 1.000000000000, 0.860918669154, + 0.707106781187, 0.541196100146, 0.366025403784, 0.184591911283, + }; + float even0 = in[0] + kC12[2] * in[2] + kC12[4] * in[4] + kC12[6] * in[6]; + float even1 = in[0] + kC12[6] * in[2] - kC12[6] * in[6]; + float even2 = + in[0] + kC12[10] * in[2] - kC12[4] * in[4] - kC12[6] * in[6]; + float even3 = + in[0] - kC12[10] * in[2] - kC12[4] * in[4] + kC12[6] * in[6]; + float even4 = in[0] - kC12[6] * in[2] + kC12[6] * in[6]; + float even5 = in[0] - kC12[2] * in[2] + kC12[4] * in[4] - kC12[6] * in[6]; + float odd0 = + kC12[1] * in[1] + kC12[3] * in[3] + kC12[5] * in[5] + kC12[7] * in[7]; + float odd1 = + kC12[3] * in[1] + kC12[9] * in[3] - kC12[9] * in[5] - kC12[3] * in[7]; + float odd2 = kC12[5] * in[1] - kC12[9] * in[3] - kC12[1] * in[5] - + kC12[11] * in[7]; + float odd3 = kC12[7] * in[1] - kC12[3] * in[3] - kC12[11] * in[5] + + kC12[1] * in[7]; + float odd4 = + kC12[9] * in[1] - kC12[3] * in[3] + kC12[3] * in[5] - kC12[9] * in[7]; + float odd5 = kC12[11] * in[1] - kC12[9] * in[3] + kC12[7] * in[5] - + kC12[5] * in[7]; + out[0] = even0 + odd0; + out[11] = even0 - odd0; + out[1] = even1 + odd1; + out[10] = even1 - odd1; + out[2] = even2 + odd2; + out[9] = even2 - odd2; + out[3] = even3 + odd3; + out[8] = even3 - odd3; + out[4] = even4 + odd4; + out[7] = even4 - odd4; + out[5] = even5 + odd5; + out[6] = even5 - odd5; + break; + } + case 13: { + static constexpr float kC13[13] = { + 1.414213562373, 1.403902353238, 1.373119086479, 1.322312651445, + 1.252223920364, 1.163874944761, 1.058554051646, 0.937797056801, + 0.803364869133, 0.657217812653, 0.501487040539, 0.338443458124, + 0.170464607981, + }; + float even0 = in[0] + kC13[2] * in[2] + kC13[4] * in[4] + kC13[6] * in[6]; + float even1 = + in[0] + kC13[6] * in[2] + kC13[12] * in[4] - kC13[8] * in[6]; + float even2 = + in[0] + kC13[10] * in[2] - kC13[6] * in[4] - kC13[4] * in[6]; + float even3 = + in[0] - kC13[12] * in[2] - kC13[2] * in[4] + kC13[10] * in[6]; + float even4 = + in[0] - kC13[8] * in[2] - kC13[10] * in[4] + kC13[2] * in[6]; + float even5 = + in[0] - kC13[4] * in[2] + kC13[8] * in[4] - kC13[12] * in[6]; + float even6 = in[0] - kC13[0] * in[2] + kC13[0] * in[4] - kC13[0] * in[6]; + float odd0 = + kC13[1] * in[1] + kC13[3] * in[3] + kC13[5] * in[5] + kC13[7] * in[7]; + float odd1 = kC13[3] * in[1] + kC13[9] * in[3] - kC13[11] * in[5] - + kC13[5] * in[7]; + float odd2 = kC13[5] * in[1] - kC13[11] * in[3] - kC13[1] * in[5] - + kC13[9] * in[7]; + float odd3 = + kC13[7] * in[1] - kC13[5] * in[3] - kC13[9] * in[5] + kC13[3] * in[7]; + float odd4 = kC13[9] * in[1] - kC13[1] * in[3] + kC13[7] * in[5] + + kC13[11] * in[7]; + float odd5 = kC13[11] * in[1] - kC13[7] * in[3] + kC13[3] * in[5] - + kC13[1] * in[7]; + out[0] = even0 + odd0; + out[12] = even0 - odd0; + out[1] = even1 + odd1; + out[11] = even1 - odd1; + out[2] = even2 + odd2; + out[10] = even2 - odd2; + out[3] = even3 + odd3; + out[9] = even3 - odd3; + out[4] = even4 + odd4; + out[8] = even4 - odd4; + out[5] = even5 + odd5; + out[7] = even5 - odd5; + out[6] = even6; + break; + } + case 14: { + static constexpr float kC14[14] = { + 1.414213562373, 1.405321284327, 1.378756275744, 1.334852607020, + 1.274162392264, 1.197448846138, 1.105676685997, 1.000000000000, + 0.881747733790, 0.752406978226, 0.613604268353, 0.467085128785, + 0.314692122713, 0.158341680609, + }; + float even0 = in[0] + kC14[2] * in[2] + kC14[4] * in[4] + kC14[6] * in[6]; + float even1 = + in[0] + kC14[6] * in[2] + kC14[12] * in[4] - kC14[10] * in[6]; + float even2 = + in[0] + kC14[10] * in[2] - kC14[8] * in[4] - kC14[2] * in[6]; + float even3 = in[0] - kC14[0] * in[4]; + float even4 = + in[0] - kC14[10] * in[2] - kC14[8] * in[4] + kC14[2] * in[6]; + float even5 = + in[0] - kC14[6] * in[2] + kC14[12] * in[4] + kC14[10] * in[6]; + float even6 = in[0] - kC14[2] * in[2] + kC14[4] * in[4] - kC14[6] * in[6]; + float odd0 = + kC14[1] * in[1] + kC14[3] * in[3] + kC14[5] * in[5] + kC14[7] * in[7]; + float odd1 = kC14[3] * in[1] + kC14[9] * in[3] - kC14[13] * in[5] - + kC14[7] * in[7]; + float odd2 = kC14[5] * in[1] - kC14[13] * in[3] - kC14[3] * in[5] - + kC14[7] * in[7]; + float odd3 = + kC14[7] * in[1] - kC14[7] * in[3] - kC14[7] * in[5] + kC14[7] * in[7]; + float odd4 = kC14[9] * in[1] - kC14[1] * in[3] + kC14[11] * in[5] + + kC14[7] * in[7]; + float odd5 = kC14[11] * in[1] - kC14[5] * in[3] + kC14[1] * in[5] - + kC14[7] * in[7]; + float odd6 = kC14[13] * in[1] - kC14[11] * in[3] + kC14[9] * in[5] - + kC14[7] * in[7]; + out[0] = even0 + odd0; + out[13] = even0 - odd0; + out[1] = even1 + odd1; + out[12] = even1 - odd1; + out[2] = even2 + odd2; + out[11] = even2 - odd2; + out[3] = even3 + odd3; + out[10] = even3 - odd3; + out[4] = even4 + odd4; + out[9] = even4 - odd4; + out[5] = even5 + odd5; + out[8] = even5 - odd5; + out[6] = even6 + odd6; + out[7] = even6 - odd6; + break; + } + case 15: { + static constexpr float kC15[15] = { + 1.414213562373, 1.406466352507, 1.383309602960, 1.344997023928, + 1.291948376043, 1.224744871392, 1.144122805635, 1.050965490998, + 0.946293578512, 0.831253875555, 0.707106781187, 0.575212476952, + 0.437016024449, 0.294031532930, 0.147825570407, + }; + float even0 = in[0] + kC15[2] * in[2] + kC15[4] * in[4] + kC15[6] * in[6]; + float even1 = + in[0] + kC15[6] * in[2] + kC15[12] * in[4] - kC15[12] * in[6]; + float even2 = + in[0] + kC15[10] * in[2] - kC15[10] * in[4] - kC15[0] * in[6]; + float even3 = + in[0] + kC15[14] * in[2] - kC15[2] * in[4] - kC15[12] * in[6]; + float even4 = + in[0] - kC15[12] * in[2] - kC15[6] * in[4] + kC15[6] * in[6]; + float even5 = + in[0] - kC15[8] * in[2] - kC15[14] * in[4] + kC15[6] * in[6]; + float even6 = + in[0] - kC15[4] * in[2] + kC15[8] * in[4] - kC15[12] * in[6]; + float even7 = in[0] - kC15[0] * in[2] + kC15[0] * in[4] - kC15[0] * in[6]; + float odd0 = + kC15[1] * in[1] + kC15[3] * in[3] + kC15[5] * in[5] + kC15[7] * in[7]; + float odd1 = kC15[3] * in[1] + kC15[9] * in[3] - kC15[9] * in[7]; + float odd2 = kC15[5] * in[1] - kC15[5] * in[5] - kC15[5] * in[7]; + float odd3 = kC15[7] * in[1] - kC15[9] * in[3] - kC15[5] * in[5] + + kC15[11] * in[7]; + float odd4 = kC15[9] * in[1] - kC15[3] * in[3] + kC15[3] * in[7]; + float odd5 = kC15[11] * in[1] - kC15[3] * in[3] + kC15[5] * in[5] - + kC15[13] * in[7]; + float odd6 = kC15[13] * in[1] - kC15[9] * in[3] + kC15[5] * in[5] - + kC15[1] * in[7]; + out[0] = even0 + odd0; + out[14] = even0 - odd0; + out[1] = even1 + odd1; + out[13] = even1 - odd1; + out[2] = even2 + odd2; + out[12] = even2 - odd2; + out[3] = even3 + odd3; + out[11] = even3 - odd3; + out[4] = even4 + odd4; + out[10] = even4 - odd4; + out[5] = even5 + odd5; + out[9] = even5 - odd5; + out[6] = even6 + odd6; + out[8] = even6 - odd6; + out[7] = even7; + break; + } + case 16: { + static constexpr float kC16[16] = { + 1.414213562373, 1.407403737526, 1.387039845322, 1.353318001174, + 1.306562964876, 1.247225012987, 1.175875602419, 1.093201867002, + 1.000000000000, 0.897167586343, 0.785694958387, 0.666655658478, + 0.541196100146, 0.410524527522, 0.275899379283, 0.138617169199, + }; + float even0 = in[0] + kC16[2] * in[2] + kC16[4] * in[4] + kC16[6] * in[6]; + float even1 = + in[0] + kC16[6] * in[2] + kC16[12] * in[4] - kC16[14] * in[6]; + float even2 = + in[0] + kC16[10] * in[2] - kC16[12] * in[4] - kC16[2] * in[6]; + float even3 = + in[0] + kC16[14] * in[2] - kC16[4] * in[4] - kC16[10] * in[6]; + float even4 = + in[0] - kC16[14] * in[2] - kC16[4] * in[4] + kC16[10] * in[6]; + float even5 = + in[0] - kC16[10] * in[2] - kC16[12] * in[4] + kC16[2] * in[6]; + float even6 = + in[0] - kC16[6] * in[2] + kC16[12] * in[4] + kC16[14] * in[6]; + float even7 = in[0] - kC16[2] * in[2] + kC16[4] * in[4] - kC16[6] * in[6]; + float odd0 = (kC16[1] * in[1] + kC16[3] * in[3] + kC16[5] * in[5] + + kC16[7] * in[7]); + float odd1 = (kC16[3] * in[1] + kC16[9] * in[3] + kC16[15] * in[5] - + kC16[11] * in[7]); + float odd2 = (kC16[5] * in[1] + kC16[15] * in[3] - kC16[7] * in[5] - + kC16[3] * in[7]); + float odd3 = (kC16[7] * in[1] - kC16[11] * in[3] - kC16[3] * in[5] + + kC16[15] * in[7]); + float odd4 = (kC16[9] * in[1] - kC16[5] * in[3] - kC16[13] * in[5] + + kC16[1] * in[7]); + float odd5 = (kC16[11] * in[1] - kC16[1] * in[3] + kC16[9] * in[5] + + kC16[13] * in[7]); + float odd6 = (kC16[13] * in[1] - kC16[7] * in[3] + kC16[1] * in[5] - + kC16[5] * in[7]); + float odd7 = (kC16[15] * in[1] - kC16[13] * in[3] + kC16[11] * in[5] - + kC16[9] * in[7]); + out[0] = even0 + odd0; + out[15] = even0 - odd0; + out[1] = even1 + odd1; + out[14] = even1 - odd1; + out[2] = even2 + odd2; + out[13] = even2 - odd2; + out[3] = even3 + odd3; + out[12] = even3 - odd3; + out[4] = even4 + odd4; + out[11] = even4 - odd4; + out[5] = even5 + odd5; + out[10] = even5 - odd5; + out[6] = even6 + odd6; + out[9] = even6 - odd6; + out[7] = even7 + odd7; + out[8] = even7 - odd7; + break; + } + } +} + +void InverseTransformBlockGeneric(const int16_t* JXL_RESTRICT qblock, + const float* JXL_RESTRICT dequant, + const float* JXL_RESTRICT biases, + float* JXL_RESTRICT scratch_space, + float* JXL_RESTRICT output, + size_t output_stride, size_t dctsize) { + float* JXL_RESTRICT block0 = scratch_space; + float* JXL_RESTRICT block1 = scratch_space + DCTSIZE2; + DequantBlock(qblock, dequant, biases, block0); + if (dctsize == 1) { + *output = *block0; + } else if (dctsize == 2 || dctsize == 4) { + float* JXL_RESTRICT block2 = scratch_space + 2 * DCTSIZE2; + ComputeScaledIDCT(block0, block1, block2, 8); + if (dctsize == 4) { + for (size_t iy = 0; iy < 4; ++iy) { + for (size_t ix = 0; ix < 4; ++ix) { + float* block = &block2[16 * iy + 2 * ix]; + output[iy * output_stride + ix] = + 0.25f * (block[0] + block[1] + block[8] + block[9]); + } + } + } else { + for (size_t iy = 0; iy < 2; ++iy) { + for (size_t ix = 0; ix < 2; ++ix) { + float* block = &block2[32 * iy + 4 * ix]; + output[iy * output_stride + ix] = + 0.0625f * + (block[0] + block[1] + block[2] + block[3] + block[8] + block[9] + + block[10] + block[11] + block[16] + block[17] + block[18] + + block[19] + block[24] + block[25] + block[26] + block[27]); + } + } + } + } else { + float dctin[DCTSIZE]; + float dctout[DCTSIZE * 2]; + size_t insize = std::min(dctsize, DCTSIZE); + for (size_t ix = 0; ix < insize; ++ix) { + for (size_t iy = 0; iy < insize; ++iy) { + dctin[iy] = block0[iy * DCTSIZE + ix]; + } + Compute1dIDCT(dctin, dctout, dctsize); + for (size_t iy = 0; iy < dctsize; ++iy) { + block1[iy * dctsize + ix] = dctout[iy]; + } + } + for (size_t iy = 0; iy < dctsize; ++iy) { + Compute1dIDCT(block1 + iy * dctsize, output + iy * output_stride, + dctsize); + } + } +} + +// NOLINTNEXTLINE(google-readability-namespace-comments) +} // namespace HWY_NAMESPACE +} // namespace jpegli +HWY_AFTER_NAMESPACE(); + +#if HWY_ONCE +namespace jpegli { + +HWY_EXPORT(InverseTransformBlock8x8); +HWY_EXPORT(InverseTransformBlockGeneric); + +void ChooseInverseTransform(j_decompress_ptr cinfo) { + jpeg_decomp_master* m = cinfo->master; + for (int c = 0; c < cinfo->num_components; ++c) { + if (m->scaled_dct_size[c] == DCTSIZE) { + m->inverse_transform[c] = HWY_DYNAMIC_DISPATCH(InverseTransformBlock8x8); + } else { + m->inverse_transform[c] = + HWY_DYNAMIC_DISPATCH(InverseTransformBlockGeneric); + } + } +} + +} // namespace jpegli +#endif // HWY_ONCE -- cgit v1.2.3