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Diffstat (limited to 'third_party/jpeg-xl/lib/jxl/modular/transform/rct.cc')
| -rw-r--r-- | third_party/jpeg-xl/lib/jxl/modular/transform/rct.cc | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/third_party/jpeg-xl/lib/jxl/modular/transform/rct.cc b/third_party/jpeg-xl/lib/jxl/modular/transform/rct.cc new file mode 100644 index 0000000000..f3002a5ac3 --- /dev/null +++ b/third_party/jpeg-xl/lib/jxl/modular/transform/rct.cc @@ -0,0 +1,153 @@ +// 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/modular/transform/rct.h" +#undef HWY_TARGET_INCLUDE +#define HWY_TARGET_INCLUDE "lib/jxl/modular/transform/rct.cc" +#include <hwy/foreach_target.h> +#include <hwy/highway.h> +HWY_BEFORE_NAMESPACE(); +namespace jxl { +namespace HWY_NAMESPACE { + +// These templates are not found via ADL. +using hwy::HWY_NAMESPACE::Add; +using hwy::HWY_NAMESPACE::ShiftRight; +using hwy::HWY_NAMESPACE::Sub; + +template <int transform_type> +void InvRCTRow(const pixel_type* in0, const pixel_type* in1, + const pixel_type* in2, pixel_type* out0, pixel_type* out1, + pixel_type* out2, size_t w) { + static_assert(transform_type >= 0 && transform_type < 7, + "Invalid transform type"); + int second = transform_type >> 1; + int third = transform_type & 1; + + size_t x = 0; + const HWY_FULL(pixel_type) d; + const size_t N = Lanes(d); + for (; x + N - 1 < w; x += N) { + if (transform_type == 6) { + auto Y = Load(d, in0 + x); + auto Co = Load(d, in1 + x); + auto Cg = Load(d, in2 + x); + Y = Sub(Y, ShiftRight<1>(Cg)); + auto G = Add(Cg, Y); + Y = Sub(Y, ShiftRight<1>(Co)); + auto R = Add(Y, Co); + Store(R, d, out0 + x); + Store(G, d, out1 + x); + Store(Y, d, out2 + x); + } else { + auto First = Load(d, in0 + x); + auto Second = Load(d, in1 + x); + auto Third = Load(d, in2 + x); + if (third) Third = Add(Third, First); + if (second == 1) { + Second = Add(Second, First); + } else if (second == 2) { + Second = Add(Second, ShiftRight<1>(Add(First, Third))); + } + Store(First, d, out0 + x); + Store(Second, d, out1 + x); + Store(Third, d, out2 + x); + } + } + for (; x < w; x++) { + if (transform_type == 6) { + pixel_type Y = in0[x]; + pixel_type Co = in1[x]; + pixel_type Cg = in2[x]; + pixel_type tmp = PixelAdd(Y, -(Cg >> 1)); + pixel_type G = PixelAdd(Cg, tmp); + pixel_type B = PixelAdd(tmp, -(Co >> 1)); + pixel_type R = PixelAdd(B, Co); + out0[x] = R; + out1[x] = G; + out2[x] = B; + } else { + pixel_type First = in0[x]; + pixel_type Second = in1[x]; + pixel_type Third = in2[x]; + if (third) Third = PixelAdd(Third, First); + if (second == 1) { + Second = PixelAdd(Second, First); + } else if (second == 2) { + Second = PixelAdd(Second, (PixelAdd(First, Third) >> 1)); + } + out0[x] = First; + out1[x] = Second; + out2[x] = Third; + } + } +} + +Status InvRCT(Image& input, size_t begin_c, size_t rct_type, ThreadPool* pool) { + JXL_RETURN_IF_ERROR(CheckEqualChannels(input, begin_c, begin_c + 2)); + size_t m = begin_c; + Channel& c0 = input.channel[m + 0]; + size_t w = c0.w; + size_t h = c0.h; + if (rct_type == 0) { // noop + return true; + } + // Permutation: 0=RGB, 1=GBR, 2=BRG, 3=RBG, 4=GRB, 5=BGR + int permutation = rct_type / 7; + JXL_CHECK(permutation < 6); + // 0-5 values have the low bit corresponding to Third and the high bits + // corresponding to Second. 6 corresponds to YCoCg. + // + // Second: 0=nop, 1=SubtractFirst, 2=SubtractAvgFirstThird + // + // Third: 0=nop, 1=SubtractFirst + int custom = rct_type % 7; + // Special case: permute-only. Swap channels around. + if (custom == 0) { + Channel ch0 = std::move(input.channel[m]); + Channel ch1 = std::move(input.channel[m + 1]); + Channel ch2 = std::move(input.channel[m + 2]); + input.channel[m + (permutation % 3)] = std::move(ch0); + input.channel[m + ((permutation + 1 + permutation / 3) % 3)] = + std::move(ch1); + input.channel[m + ((permutation + 2 - permutation / 3) % 3)] = + std::move(ch2); + return true; + } + constexpr decltype(&InvRCTRow<0>) inv_rct_row[] = { + InvRCTRow<0>, InvRCTRow<1>, InvRCTRow<2>, InvRCTRow<3>, + InvRCTRow<4>, InvRCTRow<5>, InvRCTRow<6>}; + JXL_RETURN_IF_ERROR(RunOnPool( + pool, 0, h, ThreadPool::NoInit, + [&](const uint32_t task, size_t /* thread */) { + const size_t y = task; + const pixel_type* in0 = input.channel[m].Row(y); + const pixel_type* in1 = input.channel[m + 1].Row(y); + const pixel_type* in2 = input.channel[m + 2].Row(y); + pixel_type* out0 = input.channel[m + (permutation % 3)].Row(y); + pixel_type* out1 = + input.channel[m + ((permutation + 1 + permutation / 3) % 3)].Row(y); + pixel_type* out2 = + input.channel[m + ((permutation + 2 - permutation / 3) % 3)].Row(y); + inv_rct_row[custom](in0, in1, in2, out0, out1, out2, w); + }, + "InvRCT")); + return true; +} + +} // namespace HWY_NAMESPACE +} // namespace jxl +HWY_AFTER_NAMESPACE(); + +#if HWY_ONCE +namespace jxl { + +HWY_EXPORT(InvRCT); +Status InvRCT(Image& input, size_t begin_c, size_t rct_type, ThreadPool* pool) { + return HWY_DYNAMIC_DISPATCH(InvRCT)(input, begin_c, rct_type, pool); +} + +} // namespace jxl +#endif |