#include <cmath></cmath>

#include <vector></vector>

#include <limits> /* std::numeric_limits */</limits>

#include "igs_ifx_common.h"

#include "igs_warp.h"

namespace

{

template <class class="" rt="" st,=""></class>

void hori_change_template_(

	ST *image, const int height, const int width, const int channels

	,

	const RT *refer // same as height,width,channels

	,

	const int refchannels, const int refcc

	,

	const double offset, const double maxlen, const bool alpha_rendering_sw, const bool anti_aliasing_sw)

{

	const double smax = std::numeric_limits<st>::max();</st>

	const double rmax = std::numeric_limits<rt>::max();</rt>

	std::vector<std::vector<double>> buf_s1(channels),</std::vector<double>

		buf_s2(channels);

	for (int zz = 0; zz < channels; ++zz) {

		buf_s1.at(zz).resize(width);

		buf_s2.at(zz).resize(width);

	}

	std::vector<double> buf_r(width);</double>

	refer += refcc; /* 参照画像の参照色チャンネル */

	for (int yy = 0; yy < height; ++yy, image += channels * width, refer += refchannels * width) {

		for (int xx = 0; xx < width; ++xx) {

			for (int zz = 0; zz < channels; ++zz) {

				buf_s1.at(zz).at(xx) = image[xx * channels + zz] / smax;

			}

		}

		for (int xx = 0; xx < width; ++xx) { //reference red of refer[]

			double pos = static_cast<double>(refer[xx * refchannels]);</double>

			buf_r.at(xx) = ((pos / rmax) - offset) * maxlen;

		}

		if (anti_aliasing_sw) {

			for (int xx = 0; xx < width; ++xx) {

				double pos = buf_r.at(xx);

				int fl_pos = xx + static_cast<int>(std::floor(pos));</int>

				int ce_pos = xx + static_cast<int>(std::ceil(pos));</int>

				double div = pos - floor(pos);

				if (fl_pos < 0) {

					fl_pos = 0;

				} else if (width <= fl_pos) {

					fl_pos = width - 1;

				}

				if (ce_pos < 0) {

					ce_pos = 0;

				} else if (width <= ce_pos) {

					ce_pos = width - 1;

				}

				for (int zz = 0; zz < channels; ++zz) {

					if (!alpha_rendering_sw && (igs::image::rgba::alp == zz)) {

						buf_s2.at(zz).at(xx) = buf_s1.at(zz).at(xx);

					} else {

						buf_s2.at(zz).at(xx) =

							buf_s1.at(zz).at(fl_pos) * (1.0 - div) +

							buf_s1.at(zz).at(ce_pos) * div;

					}

				}

			}

		} else {

			for (int xx = 0; xx < width; ++xx) {

				int pos = xx + static_cast<int>(floor(buf_r.at(xx) + 0.5));</int>

				if (pos < 0) {

					pos = 0;

				} else if (width <= pos) {

					pos = width - 1;

				}

				for (int zz = 0; zz < channels; ++zz) {

					if (!alpha_rendering_sw && (igs::image::rgba::alp == zz)) {

						buf_s2.at(zz).at(xx) = buf_s1.at(zz).at(xx);

					} else {

						buf_s2.at(zz).at(xx) = buf_s1.at(zz).at(pos);

					}

				}

			}

		}

		for (int xx = 0; xx < width; ++xx) {

			for (int zz = 0; zz < channels; ++zz) {

				image[xx * channels + zz] = static_cast<st>(</st>

					buf_s2.at(zz).at(xx) * (smax + 0.999999));

			}

		}

	}

}

}

//--------------------------------------------------------------------

void igs::warp::hori_change(

	unsigned char *image, const int height, const int width, const int channels, const int bits

	,

	const unsigned char *refer // by height,width,channels

	,

	const int refchannels, const int refcc, const int refbit

	,

	const double offset, const double maxlen, const bool alpha_rendering_sw, const bool anti_aliasing_sw)

{

	const int ucharb = std::numeric_limits<unsigned char="">::digits;</unsigned>

	const int ushortb = std::numeric_limits<unsigned short="">::digits;</unsigned>

	if ((ushortb == bits) && (ushortb == refbit)) {

		hori_change_template_(

			reinterpret_cast<unsigned *="" short="">(image), height, width, channels, reinterpret_cast<const *="" short="" unsigned="">(refer), refchannels, refcc, offset, maxlen, alpha_rendering_sw, anti_aliasing_sw);</const></unsigned>

	} else if ((ushortb == bits) && (ucharb == refbit)) {

		hori_change_template_(

			reinterpret_cast<unsigned *="" short="">(image), height, width, channels, refer, refchannels, refcc, offset, maxlen, alpha_rendering_sw, anti_aliasing_sw);</unsigned>

	} else if ((ucharb == bits) && (ushortb == refbit)) {

		hori_change_template_(

			image, height, width, channels, reinterpret_cast<const *="" short="" unsigned="">(refer), refchannels, refcc, offset, maxlen, alpha_rendering_sw, anti_aliasing_sw);</const>

	} else if ((ucharb == bits) && (ucharb == refbit)) {

		hori_change_template_(

			image, height, width, channels, refer, refchannels, refcc, offset, maxlen, alpha_rendering_sw, anti_aliasing_sw);

	}

}