Add Chromium-only Blender WebEngine parity work

blender-5.2.0/intern/cycles/util/image.h

@@ -0,0 +1,124 @@
+/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
+ *
+ * SPDX-License-Identifier: Apache-2.0 */
+
+#pragma once
+
+/* OpenImageIO is used for all image file reading and writing. */
+
+#include <OpenImageIO/imageio.h>
+
+#include "util/half.h"
+#include "util/vector.h"
+
+CCL_NAMESPACE_BEGIN
+
+using OIIO::AutoStride;
+using OIIO::ImageInput;
+using OIIO::ImageOutput;
+using OIIO::ImageSpec;
+
+template<typename T>
+void util_image_resize_pixels(const vector<T> &input_pixels,
+                              const int64_t input_width,
+                              const int64_t input_height,
+                              const int64_t components,
+                              vector<T> *output_pixels,
+                              int64_t *output_width,
+                              int64_t *output_height);
+
+/* Cast input pixel from unknown storage to float. */
+template<typename T> inline float util_image_cast_to_float(T value);
+
+template<> inline float util_image_cast_to_float(const float value)
+{
+  return value;
+}
+template<> inline float util_image_cast_to_float(const uchar value)
+{
+  return (float)value / 255.0f;
+}
+template<> inline float util_image_cast_to_float(const uint16_t value)
+{
+  return (float)value / 65535.0f;
+}
+template<> inline float util_image_cast_to_float(half value)
+{
+  return half_to_float_image(value);
+}
+
+/* Cast float value to output pixel type. */
+template<typename T> inline T util_image_cast_from_float(const float value);
+
+template<> inline float util_image_cast_from_float(const float value)
+{
+  return value;
+}
+template<> inline uchar util_image_cast_from_float(const float value)
+{
+  if (value < 0.0f) {
+    return 0;
+  }
+  if (value > (1.0f - 0.5f / 255.0f)) {
+    return 255;
+  }
+  return (uchar)((255.0f * value) + 0.5f);  // NOLINT
+}
+template<> inline uint16_t util_image_cast_from_float(const float value)
+{
+  if (value < 0.0f) {
+    return 0;
+  }
+  if (value > (1.0f - 0.5f / 65535.0f)) {
+    return 65535;
+  }
+  return (uint16_t)((65535.0f * value) + 0.5f);  // NOLINT
+}
+template<> inline half util_image_cast_from_float(const float value)
+{
+  return float_to_half_image(value);
+}
+
+/* Multiply image pixels in native data format. */
+template<typename T> inline T util_image_multiply_native(T a, T b);
+
+template<> inline float util_image_multiply_native(const float a, const float b)
+{
+  return a * b;
+}
+template<> inline uchar util_image_multiply_native(const uchar a, const uchar b)
+{
+  return ((uint32_t)a * (uint32_t)b) / 255;
+}
+template<> inline uint16_t util_image_multiply_native(const uint16_t a, const uint16_t b)
+{
+  return ((uint32_t)a * (uint32_t)b) / 65535;
+}
+template<> inline half util_image_multiply_native(half a, half b)
+{
+  return float_to_half_image(half_to_float_image(a) * half_to_float_image(b));
+}
+
+/* Test if value is finite, in native data format. */
+template<typename T> inline T util_image_is_finite(T a);
+
+template<> inline float util_image_is_finite(const float a)
+{
+  return isfinite(a);
+}
+template<> inline uchar util_image_is_finite(const uchar /*a*/)
+{
+  return true;
+}
+template<> inline uint16_t util_image_is_finite(const uint16_t /*a*/)
+{
+  return true;
+}
+template<> inline half util_image_is_finite(half a)
+{
+  return half_is_finite(a);
+}
+
+CCL_NAMESPACE_END
+
+#include "util/image_impl.h"  // IWYU pragma: export