libcruft-util/noise.cpp

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/*
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* 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
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*
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* 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.
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*
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* Copyright 2011-2015 Danny Robson <danny@nerdcruft.net>
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*/
#include "noise.hpp"
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#include "range.hpp"
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#include <iostream>
#include <limits>
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//-----------------------------------------------------------------------------
template <typename T>
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void
util::noise::fill (image::buffer<T> &pixels,
const util::noise::fractal<T> &gen)
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{
size_t h = pixels.h, s = pixels.s, w = pixels.w;
T *data = pixels.data ();
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for (size_t y = 0; y < h; ++y)
for (size_t x = 0; x < w; ++x)
data[y * s + x] = gen (x, y);
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}
template void util::noise::fill (image::buffer<float>&, const util::noise::fractal<float>&);
template void util::noise::fill (image::buffer<double>&, const util::noise::fractal<double>&);
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//-----------------------------------------------------------------------------
void
util::noise::image2d (uint8_t *restrict pixels,
size_t width,
size_t height,
const util::noise::fractal<float> &p) {
for (size_t y = 0; y < height; ++y)
for (size_t x = 0; x < width; ++x) {
double v = p (x, y);
pixels[x + y * width] = static_cast<uint8_t> (v * std::numeric_limits<uint8_t>::max ());
}
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}