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/*
* Copyright 2011-2013 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __UTIL_IMAGE_H__
#define __UTIL_IMAGE_H__
/* OpenImageIO is used for all image file reading and writing. */
#include <OpenImageIO/imageio.h>
#include "util/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(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(value);
}
CCL_NAMESPACE_END
#endif /* __UTIL_IMAGE_H__ */
#include "util/util_image_impl.h"
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