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/* SPDX-License-Identifier: Apache-2.0
* Copyright 2011-2022 Blender Foundation */
#ifndef __UTIL_IMAGE_H__
# define __UTIL_IMAGE_H__
/* 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
OIIO_NAMESPACE_USING
template<typename T>
void util_image_resize_pixels(const vector<T> &input_pixels,
const size_t input_width,
const size_t input_height,
const size_t input_depth,
const size_t components,
vector<T> *output_pixels,
size_t *output_width,
size_t *output_height,
size_t *output_depth);
/* 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(float value)
{
return value;
}
template<> inline float util_image_cast_to_float(uchar value)
{
return (float)value / 255.0f;
}
template<> inline float util_image_cast_to_float(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(float value);
template<> inline float util_image_cast_from_float(float value)
{
return value;
}
template<> inline uchar util_image_cast_from_float(float value)
{
if (value < 0.0f) {
return 0;
}
else if (value > (1.0f - 0.5f / 255.0f)) {
return 255;
}
return (uchar)((255.0f * value) + 0.5f);
}
template<> inline uint16_t util_image_cast_from_float(float value)
{
if (value < 0.0f) {
return 0;
}
else if (value > (1.0f - 0.5f / 65535.0f)) {
return 65535;
}
return (uint16_t)((65535.0f * value) + 0.5f);
}
template<> inline half util_image_cast_from_float(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(float a, float b)
{
return a * b;
}
template<> inline uchar util_image_multiply_native(uchar a, uchar b)
{
return ((uint32_t)a * (uint32_t)b) / 255;
}
template<> inline uint16_t util_image_multiply_native(uint16_t a, 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));
}
CCL_NAMESPACE_END
#endif /* __UTIL_IMAGE_H__ */
#include "util/image_impl.h"
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