summaryrefslogtreecommitdiffstats
path: root/third_party/jpeg-xl/lib/jpegli/downsample.cc
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--third_party/jpeg-xl/lib/jpegli/downsample.cc356
1 files changed, 356 insertions, 0 deletions
diff --git a/third_party/jpeg-xl/lib/jpegli/downsample.cc b/third_party/jpeg-xl/lib/jpegli/downsample.cc
new file mode 100644
index 0000000000..df2c156972
--- /dev/null
+++ b/third_party/jpeg-xl/lib/jpegli/downsample.cc
@@ -0,0 +1,356 @@
+// 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/downsample.h"
+
+#undef HWY_TARGET_INCLUDE
+#define HWY_TARGET_INCLUDE "lib/jpegli/downsample.cc"
+#include <hwy/foreach_target.h>
+#include <hwy/highway.h>
+
+#include "lib/jpegli/encode_internal.h"
+#include "lib/jpegli/error.h"
+
+HWY_BEFORE_NAMESPACE();
+namespace jpegli {
+namespace HWY_NAMESPACE {
+
+// These templates are not found via ADL.
+using hwy::HWY_NAMESPACE::Add;
+using hwy::HWY_NAMESPACE::Mul;
+using hwy::HWY_NAMESPACE::Vec;
+
+using D = HWY_CAPPED(float, 8);
+constexpr D d;
+
+void DownsampleRow2x1(const float* row_in, size_t len, float* row_out) {
+ const size_t N = Lanes(d);
+ const size_t len_out = len / 2;
+ const auto mul = Set(d, 0.5f);
+ Vec<D> v0, v1;
+ for (size_t x = 0; x < len_out; x += N) {
+ LoadInterleaved2(d, row_in + 2 * x, v0, v1);
+ Store(Mul(mul, Add(v0, v1)), d, row_out + x);
+ }
+}
+
+void DownsampleRow3x1(const float* row_in, size_t len, float* row_out) {
+ const size_t N = Lanes(d);
+ const size_t len_out = len / 3;
+ const auto mul = Set(d, 1.0f / 3);
+ Vec<D> v0, v1, v2;
+ for (size_t x = 0; x < len_out; x += N) {
+ LoadInterleaved3(d, row_in + 3 * x, v0, v1, v2);
+ Store(Mul(mul, Add(Add(v0, v1), v2)), d, row_out + x);
+ }
+}
+
+void DownsampleRow4x1(const float* row_in, size_t len, float* row_out) {
+ const size_t N = Lanes(d);
+ const size_t len_out = len / 4;
+ const auto mul = Set(d, 0.25f);
+ Vec<D> v0, v1, v2, v3;
+ for (size_t x = 0; x < len_out; x += N) {
+ LoadInterleaved4(d, row_in + 4 * x, v0, v1, v2, v3);
+ Store(Mul(mul, Add(Add(v0, v1), Add(v2, v3))), d, row_out + x);
+ }
+}
+
+void Downsample2x1(float* rows_in[MAX_SAMP_FACTOR], size_t len,
+ float* row_out) {
+ DownsampleRow2x1(rows_in[0], len, row_out);
+}
+
+void Downsample3x1(float* rows_in[MAX_SAMP_FACTOR], size_t len,
+ float* row_out) {
+ DownsampleRow3x1(rows_in[0], len, row_out);
+}
+
+void Downsample4x1(float* rows_in[MAX_SAMP_FACTOR], size_t len,
+ float* row_out) {
+ DownsampleRow4x1(rows_in[0], len, row_out);
+}
+
+void Downsample1x2(float* rows_in[MAX_SAMP_FACTOR], size_t len,
+ float* row_out) {
+ const size_t N = Lanes(d);
+ const auto mul = Set(d, 0.5f);
+ float* row0 = rows_in[0];
+ float* row1 = rows_in[1];
+ for (size_t x = 0; x < len; x += N) {
+ Store(Mul(mul, Add(Load(d, row0 + x), Load(d, row1 + x))), d, row_out + x);
+ }
+}
+
+void Downsample2x2(float* rows_in[MAX_SAMP_FACTOR], size_t len,
+ float* row_out) {
+ const size_t N = Lanes(d);
+ const size_t len_out = len / 2;
+ const auto mul = Set(d, 0.25f);
+ float* row0 = rows_in[0];
+ float* row1 = rows_in[1];
+ Vec<D> v0, v1, v2, v3;
+ for (size_t x = 0; x < len_out; x += N) {
+ LoadInterleaved2(d, row0 + 2 * x, v0, v1);
+ LoadInterleaved2(d, row1 + 2 * x, v2, v3);
+ Store(Mul(mul, Add(Add(v0, v1), Add(v2, v3))), d, row_out + x);
+ }
+}
+
+void Downsample3x2(float* rows_in[MAX_SAMP_FACTOR], size_t len,
+ float* row_out) {
+ DownsampleRow3x1(rows_in[0], len, rows_in[0]);
+ DownsampleRow3x1(rows_in[1], len, rows_in[1]);
+ Downsample1x2(rows_in, len / 3, row_out);
+}
+
+void Downsample4x2(float* rows_in[MAX_SAMP_FACTOR], size_t len,
+ float* row_out) {
+ DownsampleRow4x1(rows_in[0], len, rows_in[0]);
+ DownsampleRow4x1(rows_in[1], len, rows_in[1]);
+ Downsample1x2(rows_in, len / 4, row_out);
+}
+
+void Downsample1x3(float* rows_in[MAX_SAMP_FACTOR], size_t len,
+ float* row_out) {
+ const size_t N = Lanes(d);
+ const auto mul = Set(d, 1.0f / 3);
+ float* row0 = rows_in[0];
+ float* row1 = rows_in[1];
+ float* row2 = rows_in[2];
+ for (size_t x = 0; x < len; x += N) {
+ const auto in0 = Load(d, row0 + x);
+ const auto in1 = Load(d, row1 + x);
+ const auto in2 = Load(d, row2 + x);
+ Store(Mul(mul, Add(Add(in0, in1), in2)), d, row_out + x);
+ }
+}
+
+void Downsample2x3(float* rows_in[MAX_SAMP_FACTOR], size_t len,
+ float* row_out) {
+ DownsampleRow2x1(rows_in[0], len, rows_in[0]);
+ DownsampleRow2x1(rows_in[1], len, rows_in[1]);
+ DownsampleRow2x1(rows_in[2], len, rows_in[2]);
+ Downsample1x3(rows_in, len / 2, row_out);
+}
+
+void Downsample3x3(float* rows_in[MAX_SAMP_FACTOR], size_t len,
+ float* row_out) {
+ DownsampleRow3x1(rows_in[0], len, rows_in[0]);
+ DownsampleRow3x1(rows_in[1], len, rows_in[1]);
+ DownsampleRow3x1(rows_in[2], len, rows_in[2]);
+ Downsample1x3(rows_in, len / 3, row_out);
+}
+
+void Downsample4x3(float* rows_in[MAX_SAMP_FACTOR], size_t len,
+ float* row_out) {
+ DownsampleRow4x1(rows_in[0], len, rows_in[0]);
+ DownsampleRow4x1(rows_in[1], len, rows_in[1]);
+ DownsampleRow4x1(rows_in[2], len, rows_in[2]);
+ Downsample1x3(rows_in, len / 4, row_out);
+}
+
+void Downsample1x4(float* rows_in[MAX_SAMP_FACTOR], size_t len,
+ float* row_out) {
+ const size_t N = Lanes(d);
+ const auto mul = Set(d, 0.25f);
+ float* row0 = rows_in[0];
+ float* row1 = rows_in[1];
+ float* row2 = rows_in[2];
+ float* row3 = rows_in[3];
+ for (size_t x = 0; x < len; x += N) {
+ const auto in0 = Load(d, row0 + x);
+ const auto in1 = Load(d, row1 + x);
+ const auto in2 = Load(d, row2 + x);
+ const auto in3 = Load(d, row3 + x);
+ Store(Mul(mul, Add(Add(in0, in1), Add(in2, in3))), d, row_out + x);
+ }
+}
+
+void Downsample2x4(float* rows_in[MAX_SAMP_FACTOR], size_t len,
+ float* row_out) {
+ DownsampleRow2x1(rows_in[0], len, rows_in[0]);
+ DownsampleRow2x1(rows_in[1], len, rows_in[1]);
+ DownsampleRow2x1(rows_in[2], len, rows_in[2]);
+ DownsampleRow2x1(rows_in[3], len, rows_in[3]);
+ Downsample1x4(rows_in, len / 2, row_out);
+}
+
+void Downsample3x4(float* rows_in[MAX_SAMP_FACTOR], size_t len,
+ float* row_out) {
+ DownsampleRow3x1(rows_in[0], len, rows_in[0]);
+ DownsampleRow3x1(rows_in[1], len, rows_in[1]);
+ DownsampleRow3x1(rows_in[2], len, rows_in[2]);
+ DownsampleRow3x1(rows_in[3], len, rows_in[3]);
+ Downsample1x4(rows_in, len / 3, row_out);
+}
+
+void Downsample4x4(float* rows_in[MAX_SAMP_FACTOR], size_t len,
+ float* row_out) {
+ DownsampleRow4x1(rows_in[0], len, rows_in[0]);
+ DownsampleRow4x1(rows_in[1], len, rows_in[1]);
+ DownsampleRow4x1(rows_in[2], len, rows_in[2]);
+ DownsampleRow4x1(rows_in[3], len, rows_in[3]);
+ Downsample1x4(rows_in, len / 4, row_out);
+}
+
+// NOLINTNEXTLINE(google-readability-namespace-comments)
+} // namespace HWY_NAMESPACE
+} // namespace jpegli
+HWY_AFTER_NAMESPACE();
+
+#if HWY_ONCE
+namespace jpegli {
+
+HWY_EXPORT(Downsample1x2);
+HWY_EXPORT(Downsample1x3);
+HWY_EXPORT(Downsample1x4);
+HWY_EXPORT(Downsample2x1);
+HWY_EXPORT(Downsample2x2);
+HWY_EXPORT(Downsample2x3);
+HWY_EXPORT(Downsample2x4);
+HWY_EXPORT(Downsample3x1);
+HWY_EXPORT(Downsample3x2);
+HWY_EXPORT(Downsample3x3);
+HWY_EXPORT(Downsample3x4);
+HWY_EXPORT(Downsample4x1);
+HWY_EXPORT(Downsample4x2);
+HWY_EXPORT(Downsample4x3);
+HWY_EXPORT(Downsample4x4);
+
+void NullDownsample(float* rows_in[MAX_SAMP_FACTOR], size_t len,
+ float* row_out) {}
+
+void ChooseDownsampleMethods(j_compress_ptr cinfo) {
+ jpeg_comp_master* m = cinfo->master;
+ for (int c = 0; c < cinfo->num_components; c++) {
+ m->downsample_method[c] = nullptr;
+ jpeg_component_info* comp = &cinfo->comp_info[c];
+ const int h_factor = cinfo->max_h_samp_factor / comp->h_samp_factor;
+ const int v_factor = cinfo->max_v_samp_factor / comp->v_samp_factor;
+ if (v_factor == 1) {
+ if (h_factor == 1) {
+ m->downsample_method[c] = NullDownsample;
+ } else if (h_factor == 2) {
+ m->downsample_method[c] = HWY_DYNAMIC_DISPATCH(Downsample2x1);
+ } else if (h_factor == 3) {
+ m->downsample_method[c] = HWY_DYNAMIC_DISPATCH(Downsample3x1);
+ } else if (h_factor == 4) {
+ m->downsample_method[c] = HWY_DYNAMIC_DISPATCH(Downsample4x1);
+ }
+ } else if (v_factor == 2) {
+ if (h_factor == 1) {
+ m->downsample_method[c] = HWY_DYNAMIC_DISPATCH(Downsample1x2);
+ } else if (h_factor == 2) {
+ m->downsample_method[c] = HWY_DYNAMIC_DISPATCH(Downsample2x2);
+ } else if (h_factor == 3) {
+ m->downsample_method[c] = HWY_DYNAMIC_DISPATCH(Downsample3x2);
+ } else if (h_factor == 4) {
+ m->downsample_method[c] = HWY_DYNAMIC_DISPATCH(Downsample4x2);
+ }
+ } else if (v_factor == 3) {
+ if (h_factor == 1) {
+ m->downsample_method[c] = HWY_DYNAMIC_DISPATCH(Downsample1x2);
+ } else if (h_factor == 2) {
+ m->downsample_method[c] = HWY_DYNAMIC_DISPATCH(Downsample2x2);
+ } else if (h_factor == 3) {
+ m->downsample_method[c] = HWY_DYNAMIC_DISPATCH(Downsample3x2);
+ } else if (h_factor == 4) {
+ m->downsample_method[c] = HWY_DYNAMIC_DISPATCH(Downsample4x2);
+ }
+ } else if (v_factor == 4) {
+ if (h_factor == 1) {
+ m->downsample_method[c] = HWY_DYNAMIC_DISPATCH(Downsample1x4);
+ } else if (h_factor == 2) {
+ m->downsample_method[c] = HWY_DYNAMIC_DISPATCH(Downsample2x4);
+ } else if (h_factor == 3) {
+ m->downsample_method[c] = HWY_DYNAMIC_DISPATCH(Downsample3x4);
+ } else if (h_factor == 4) {
+ m->downsample_method[c] = HWY_DYNAMIC_DISPATCH(Downsample4x4);
+ }
+ }
+ if (m->downsample_method[c] == nullptr) {
+ JPEGLI_ERROR("Unsupported downsampling ratio %dx%d", h_factor, v_factor);
+ }
+ }
+}
+
+void DownsampleInputBuffer(j_compress_ptr cinfo) {
+ if (cinfo->max_h_samp_factor == 1 && cinfo->max_v_samp_factor == 1) {
+ return;
+ }
+ jpeg_comp_master* m = cinfo->master;
+ const size_t iMCU_height = DCTSIZE * cinfo->max_v_samp_factor;
+ const size_t y0 = m->next_iMCU_row * iMCU_height;
+ const size_t y1 = y0 + iMCU_height;
+ const size_t xsize_padded = m->xsize_blocks * DCTSIZE;
+ for (int c = 0; c < cinfo->num_components; c++) {
+ jpeg_component_info* comp = &cinfo->comp_info[c];
+ const int h_factor = cinfo->max_h_samp_factor / comp->h_samp_factor;
+ const int v_factor = cinfo->max_v_samp_factor / comp->v_samp_factor;
+ if (h_factor == 1 && v_factor == 1) {
+ continue;
+ }
+ auto& input = *m->smooth_input[c];
+ auto& output = *m->raw_data[c];
+ const size_t yout0 = y0 / v_factor;
+ float* rows_in[MAX_SAMP_FACTOR];
+ for (size_t yin = y0, yout = yout0; yin < y1; yin += v_factor, ++yout) {
+ for (int iy = 0; iy < v_factor; ++iy) {
+ rows_in[iy] = input.Row(yin + iy);
+ }
+ float* row_out = output.Row(yout);
+ (*m->downsample_method[c])(rows_in, xsize_padded, row_out);
+ }
+ }
+}
+
+void ApplyInputSmoothing(j_compress_ptr cinfo) {
+ if (!cinfo->smoothing_factor) {
+ return;
+ }
+ jpeg_comp_master* m = cinfo->master;
+ const float kW1 = cinfo->smoothing_factor / 1024.0;
+ const float kW0 = 1.0f - 8.0f * kW1;
+ const size_t iMCU_height = DCTSIZE * cinfo->max_v_samp_factor;
+ const ssize_t y0 = m->next_iMCU_row * iMCU_height;
+ const ssize_t y1 = y0 + iMCU_height;
+ const ssize_t xsize_padded = m->xsize_blocks * DCTSIZE;
+ for (int c = 0; c < cinfo->num_components; c++) {
+ auto& input = m->input_buffer[c];
+ auto& output = *m->smooth_input[c];
+ if (m->next_iMCU_row == 0) {
+ input.CopyRow(-1, 0, 1);
+ }
+ if (m->next_iMCU_row + 1 == cinfo->total_iMCU_rows) {
+ size_t last_row = m->ysize_blocks * DCTSIZE - 1;
+ input.CopyRow(last_row + 1, last_row, 1);
+ }
+ // TODO(szabadka) SIMDify this.
+ for (ssize_t y = y0; y < y1; ++y) {
+ const float* row_t = input.Row(y - 1);
+ const float* row_m = input.Row(y);
+ const float* row_b = input.Row(y + 1);
+ float* row_out = output.Row(y);
+ for (ssize_t x = 0; x < xsize_padded; ++x) {
+ float val_tl = row_t[x - 1];
+ float val_tm = row_t[x];
+ float val_tr = row_t[x + 1];
+ float val_ml = row_m[x - 1];
+ float val_mm = row_m[x];
+ float val_mr = row_m[x + 1];
+ float val_bl = row_b[x - 1];
+ float val_bm = row_b[x];
+ float val_br = row_b[x + 1];
+ float val1 = (val_tl + val_tm + val_tr + val_ml + val_mr + val_bl +
+ val_bm + val_br);
+ row_out[x] = val_mm * kW0 + val1 * kW1;
+ }
+ }
+ }
+}
+
+} // namespace jpegli
+#endif // HWY_ONCE
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 10:52:56 +0000