Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 98 insertions, 0 deletions

diff --git a/third_party/jpeg-xl/lib/jxl/base/float.h b/third_party/jpeg-xl/lib/jxl/base/float.h
new file mode 100644
index 0000000000..90bdeedf54
--- /dev/null
+++ b/third_party/jpeg-xl/lib/jxl/base/float.h
@@ -0,0 +1,98 @@
+// 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.
+
+#ifndef LIB_JXL_BASE_FLOAT_H_
+#define LIB_JXL_BASE_FLOAT_H_
+
+#include <jxl/types.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "lib/jxl/base/byte_order.h"
+#include "lib/jxl/base/status.h"
+
+namespace jxl {
+
+namespace {
+// Based on highway scalar implementation, for testing
+float LoadFloat16(uint16_t bits16) {
+  const uint32_t sign = bits16 >> 15;
+  const uint32_t biased_exp = (bits16 >> 10) & 0x1F;
+  const uint32_t mantissa = bits16 & 0x3FF;
+
+  // Subnormal or zero
+  if (biased_exp == 0) {
+    const float subnormal = (1.0f / 16384) * (mantissa * (1.0f / 1024));
+    return sign ? -subnormal : subnormal;
+  }
+
+  // Normalized: convert the representation directly (faster than ldexp/tables).
+  const uint32_t biased_exp32 = biased_exp + (127 - 15);
+  const uint32_t mantissa32 = mantissa << (23 - 10);
+  const uint32_t bits32 = (sign << 31) | (biased_exp32 << 23) | mantissa32;
+
+  float result;
+  memcpy(&result, &bits32, 4);
+  return result;
+}
+}  // namespace
+
+template <typename SaveFloatAtFn>
+static Status JXL_INLINE LoadFloatRow(const uint8_t* src, size_t count,
+                                      size_t stride, JxlDataType type,
+                                      bool little_endian, float scale,
+                                      SaveFloatAtFn callback) {
+  switch (type) {
+    case JXL_TYPE_FLOAT:
+      if (little_endian) {
+        for (size_t i = 0; i < count; ++i) {
+          callback(i, LoadLEFloat(src + stride * i));
+        }
+      } else {
+        for (size_t i = 0; i < count; ++i) {
+          callback(i, LoadBEFloat(src + stride * i));
+        }
+      }
+      return true;
+
+    case JXL_TYPE_UINT8:
+      for (size_t i = 0; i < count; ++i) {
+        callback(i, src[stride * i] * scale);
+      }
+      return true;
+
+    case JXL_TYPE_UINT16:
+      if (little_endian) {
+        for (size_t i = 0; i < count; ++i) {
+          callback(i, LoadLE16(src + stride * i) * scale);
+        }
+      } else {
+        for (size_t i = 0; i < count; ++i) {
+          callback(i, LoadBE16(src + stride * i) * scale);
+        }
+      }
+      return true;
+
+    case JXL_TYPE_FLOAT16:
+      if (little_endian) {
+        for (size_t i = 0; i < count; ++i) {
+          callback(i, LoadFloat16(LoadLE16(src + stride * i)));
+        }
+      } else {
+        for (size_t i = 0; i < count; ++i) {
+          callback(i, LoadFloat16(LoadBE16(src + stride * i)));
+        }
+      }
+      return true;
+
+    default:
+      return JXL_FAILURE("Unsupported sample format");
+  }
+}
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_BASE_FLOAT_H_