280 lines
11 KiB
C++
280 lines
11 KiB
C++
#include <cmath> // pow(-)
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#include <stdexcept> // std::domain_error(-)
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#include <limits> // std::numeric_limits
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#include <vector>
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#include "igs_ifx_common.h" /* igs::image::rgba */
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#include "igs_levels.h"
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//------------------------------------------------------------
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namespace {
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void levels_(double &val // 0...1
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,
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const double in_min // 0...1
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,
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const double in_max // 0...1
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,
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const double gamma // 0.1 ... 10.0
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,
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const double out_min // 0...1
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,
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const double out_max // 0...1
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,
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const bool clamp_sw) {
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/* 1 入力範囲を正規化 */
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val = (in_max == in_min) ? in_max : (val - in_min) / (in_max - in_min);
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/* 2 (出力範囲に)clamp */
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if (clamp_sw) {
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val = (val < 0.0) ? 0.0 : ((1.0 < val) ? 1.0 : val);
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}
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/* 3 正規化の範囲でgamma変換 */
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if ((1.0 != gamma) && (0.0 != gamma)) {
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if ((0.0 < val) && (val < 1.0)) {
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val = pow(val, 1.0 / gamma);
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}
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}
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/* 4 正規化範囲を出力範囲に */
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val = out_min + val * (out_max - out_min);
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/* 5 clamp */
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val = (val < 0.0) ? 0.0 : ((1.0 < val) ? 1.0 : val);
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}
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double refchk_(const int src, const int tgt, const double refv) {
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return (src < tgt) ? (tgt - src + 0.999999) * refv + src
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: (src - tgt + 0.999999) * (1.0 - refv) + tgt;
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}
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//------------------------------------------------------------
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/*
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std::vector< std::vector<T> > &tables
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とするとvc2005mdで他プログラムとのリンク時、
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allocatorの２重定義でエラーとなる。
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std::vector< std::vector<int> >&tables
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ならOK
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2009-01-27
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*/
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template <class IT, class RT>
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void change_(IT *image_array, const int height, const int width,
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const int channels
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,
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const RT *ref /* 求める画像(out)と同じ高さ、幅、チャンネル数 */
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,
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const int ref_mode // R,G,B,A,luminance
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,
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const double r_in_min, const double r_in_max // 0...1
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,
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const double g_in_min, const double g_in_max // 0...1
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,
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const double b_in_min, const double b_in_max // 0...1
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,
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const double a_in_min, const double a_in_max // 0...1
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,
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const double r_gamma // 0.1 ... 10.0
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,
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const double g_gamma // 0.1 ... 10.0
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,
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const double b_gamma // 0.1 ... 10.0
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,
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const double a_gamma // 0.1 ... 10.0
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,
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const double r_out_min, const double r_out_max // 0...1
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,
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const double g_out_min, const double g_out_max // 0...1
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,
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const double b_out_min, const double b_out_max // 0...1
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,
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const double a_out_min, const double a_out_max // 0...1
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,
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const bool clamp_sw, const bool alpha_sw,
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const bool add_blend_sw) {
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/* 1 最大値、最小値から変換テーブルを求める */
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std::vector<std::vector<int>> tables;
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const unsigned int val_max = std::numeric_limits<IT>::max();
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const double div_val = static_cast<double>(val_max);
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const double mul_val = div_val + 0.999999;
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{
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using namespace igs::image::rgba;
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tables.resize(siz);
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tables[red].resize(val_max + 1);
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tables[gre].resize(val_max + 1);
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tables[blu].resize(val_max + 1);
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tables[alp].resize(val_max + 1);
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for (unsigned int yy = 0; yy <= val_max; ++yy) {
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double rr, gg, bb, aa;
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rr = gg = bb = aa = yy / div_val;
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levels_(rr, r_in_min, r_in_max, r_gamma, r_out_min, r_out_max, clamp_sw);
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levels_(gg, g_in_min, g_in_max, g_gamma, g_out_min, g_out_max, clamp_sw);
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levels_(bb, b_in_min, b_in_max, b_gamma, b_out_min, b_out_max, clamp_sw);
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levels_(aa, a_in_min, a_in_max, a_gamma, a_out_min, a_out_max, clamp_sw);
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/* 0〜1.0 --> 0〜mul_maxスケール変換し、整数値化 */
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tables[red][yy] = static_cast<int>(rr * mul_val);
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tables[gre][yy] = static_cast<int>(gg * mul_val);
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tables[blu][yy] = static_cast<int>(bb * mul_val);
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tables[alp][yy] = static_cast<int>(aa * mul_val);
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}
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}
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/* 2 変換テーブルを使ってlevel変換する */
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const int pixsize = height * width;
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const int r_max = std::numeric_limits<RT>::max();
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if (igs::image::rgba::siz == channels) {
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using namespace igs::image::rgba;
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for (int ii = 0; ii < pixsize; ++ii, image_array += channels) {
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/* 変化量初期値 */
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double refv = 1.0;
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/* 参照画像あればピクセル単位の画像変化量を得る */
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if (ref != 0) {
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refv *= igs::color::ref_value(ref, channels, r_max, ref_mode);
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ref += channels; /* continue;の前に行うこと */
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}
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/* AlphaのLevel処理した値をrefvの変化量比で加える */
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if (alpha_sw) {
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image_array[alp] =
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static_cast<IT>(refchk_(static_cast<int>(image_array[alp]),
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tables[alp][image_array[alp]], refv));
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}
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/* 加算合成で、Alpha値ゼロならRGB値を計算する必要はない */
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if (add_blend_sw && (0 == image_array[alp])) {
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continue;
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}
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/* 加算合成でなくAlpha合成の時は、Alpha値がゼロでも
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RGB値は存在する(してもよい)の計算する */
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/* 加算合成で、その値がMaxでなければ変化量に乗算 */
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if (add_blend_sw && (image_array[alp] < val_max)) {
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refv *= static_cast<double>(image_array[alp]) / div_val;
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}
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/* RGBのLevel処理した値をrefvの変化量比で加える */
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image_array[red] =
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static_cast<IT>(refchk_(static_cast<int>(image_array[red]),
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tables[red][image_array[red]], refv));
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image_array[gre] =
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static_cast<IT>(refchk_(static_cast<int>(image_array[gre]),
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tables[gre][image_array[gre]], refv));
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image_array[blu] =
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static_cast<IT>(refchk_(static_cast<int>(image_array[blu]),
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tables[blu][image_array[blu]], refv));
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}
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} else if (igs::image::rgb::siz == channels) {
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using namespace igs::image::rgb;
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for (int ii = 0; ii < pixsize; ++ii, image_array += channels) {
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double refv = 1.0;
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if (ref != 0) {
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refv *= igs::color::ref_value(ref, channels, r_max, ref_mode);
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ref += channels;
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}
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/* RGBのLevel処理した値をrefvの変化量比で加える */
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image_array[red] =
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static_cast<IT>(refchk_(static_cast<int>(image_array[red]),
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tables[red][image_array[red]], refv));
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image_array[gre] =
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static_cast<IT>(refchk_(static_cast<int>(image_array[gre]),
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tables[gre][image_array[gre]], refv));
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image_array[blu] =
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static_cast<IT>(refchk_(static_cast<int>(image_array[blu]),
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tables[blu][image_array[blu]], refv));
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}
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} else if (1 == channels) { /* grayscale */
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for (int ii = 0; ii < pixsize; ++ii, ++image_array) {
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double refv = 1.0;
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if (ref != 0) {
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refv *= igs::color::ref_value(ref, channels, r_max, ref_mode);
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ref += channels;
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}
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image_array[0] = static_cast<IT>(refchk_(
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static_cast<int>(image_array[0]), tables[0][image_array[0]], refv));
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}
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}
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/* 1 変換テーブルのメモリ解放 */
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tables.clear();
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}
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}
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//------------------------------------------------------------
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void igs::levels::change(
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unsigned char *image_array, const int height, const int width,
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const int channels, const int bits
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,
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const unsigned char *ref /* 求める画像と同じ高、幅、ch数 */
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,
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const int ref_bits /* refがゼロのときはここもゼロ */
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,
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const int ref_mode /* 0=R,1=G,2=B,3=A,4=Luminance,5=Nothing */
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,
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const double r_in_min, const double r_in_max // 0...1
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,
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const double g_in_min, const double g_in_max // 0...1
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,
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const double b_in_min, const double b_in_max // 0...1
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,
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const double a_in_min, const double a_in_max // 0...1
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,
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const double r_gamma // 0.1 ... 10.0
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,
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const double g_gamma // 0.1 ... 10.0
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,
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const double b_gamma // 0.1 ... 10.0
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,
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const double a_gamma // 0.1 ... 10.0
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,
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const double r_out_min, const double r_out_max // 0...1
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,
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const double g_out_min, const double g_out_max // 0...1
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,
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const double b_out_min, const double b_out_max // 0...1
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,
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const double a_out_min, const double a_out_max // 0...1
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,
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const bool clamp_sw, const bool alpha_sw, const bool add_blend_sw) {
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if ((igs::image::rgba::siz != channels) &&
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(igs::image::rgb::siz != channels) && (1 != channels) /* grayscale */
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) {
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throw std::domain_error("Bad channels,Not rgba/rgb/grayscale");
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}
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if ((std::numeric_limits<unsigned char>::digits == bits) &&
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((std::numeric_limits<unsigned char>::digits == ref_bits) ||
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(0 == ref_bits))) {
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change_(image_array, height, width, channels, ref, ref_mode, r_in_min,
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r_in_max, g_in_min, g_in_max, b_in_min, b_in_max, a_in_min,
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a_in_max, r_gamma, g_gamma, b_gamma, a_gamma, r_out_min, r_out_max,
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g_out_min, g_out_max, b_out_min, b_out_max, a_out_min, a_out_max,
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clamp_sw, alpha_sw, add_blend_sw);
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} else if ((std::numeric_limits<unsigned short>::digits == bits) &&
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((std::numeric_limits<unsigned char>::digits == ref_bits) ||
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(0 == ref_bits))) {
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change_(reinterpret_cast<unsigned short *>(image_array), height, width,
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channels, ref, ref_mode, r_in_min, r_in_max, g_in_min, g_in_max,
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b_in_min, b_in_max, a_in_min, a_in_max, r_gamma, g_gamma, b_gamma,
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a_gamma, r_out_min, r_out_max, g_out_min, g_out_max, b_out_min,
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b_out_max, a_out_min, a_out_max, clamp_sw, alpha_sw, add_blend_sw);
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} else if ((std::numeric_limits<unsigned short>::digits == bits) &&
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(std::numeric_limits<unsigned short>::digits == ref_bits)) {
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change_(reinterpret_cast<unsigned short *>(image_array), height, width,
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channels, reinterpret_cast<const unsigned short *>(ref), ref_mode,
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r_in_min, r_in_max, g_in_min, g_in_max, b_in_min, b_in_max,
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a_in_min, a_in_max, r_gamma, g_gamma, b_gamma, a_gamma, r_out_min,
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r_out_max, g_out_min, g_out_max, b_out_min, b_out_max, a_out_min,
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a_out_max, clamp_sw, alpha_sw, add_blend_sw);
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} else if ((std::numeric_limits<unsigned char>::digits == bits) &&
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(std::numeric_limits<unsigned short>::digits == ref_bits)) {
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change_(image_array, height, width, channels,
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reinterpret_cast<const unsigned short *>(ref), ref_mode, r_in_min,
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r_in_max, g_in_min, g_in_max, b_in_min, b_in_max, a_in_min,
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a_in_max, r_gamma, g_gamma, b_gamma, a_gamma, r_out_min, r_out_max,
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g_out_min, g_out_max, b_out_min, b_out_max, a_out_min, a_out_max,
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clamp_sw, alpha_sw, add_blend_sw);
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} else {
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throw std::domain_error("Bad bits,Not uchar/ushort");
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}
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}
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