89 lines
3.2 KiB
C++
89 lines
3.2 KiB
C++
#include <cmath>
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#include <vector>
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#include <limits> /* std::numeric_limits */
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#include "igs_ifx_common.h"
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#include "igs_warp.h"
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namespace {
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void vert_change_(float* image, const int height, const int width,
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const int channels,
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const float* refer, // same as height,width,channels
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const int refchannels, const int refcc, const double maxlen,
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const bool alpha_rendering_sw, const bool anti_aliasing_sw) {
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std::vector<std::vector<float>> buf_s1(channels);
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for (int zz = 0; zz < channels; ++zz) {
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buf_s1.at(zz).resize(height);
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}
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std::vector<float> buf_r(height);
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refer += refcc; /* 参照画像の参照色チャンネル */
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for (int xx = 0; xx < width; ++xx, image += channels, refer += refchannels) {
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for (int yy = 0; yy < height; ++yy) {
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for (int zz = 0; zz < channels; ++zz) {
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buf_s1.at(zz).at(yy) = image[yy * width * channels + zz];
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}
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}
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for (int yy = 0; yy < height; ++yy) { // reference red of refer[]
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float pos = refer[yy * width * refchannels];
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buf_r.at(yy) = (pos - 0.5f) * maxlen;
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}
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if (anti_aliasing_sw) {
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for (int yy = 0; yy < height; ++yy) {
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double pos = buf_r.at(yy);
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int fl_pos = yy + static_cast<int>(std::floor(pos));
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int ce_pos = yy + static_cast<int>(std::ceil(pos));
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float div = pos - floor(pos);
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// clamp
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if (fl_pos < 0)
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fl_pos = 0;
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else if (height <= fl_pos)
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fl_pos = height - 1;
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if (ce_pos < 0)
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ce_pos = 0;
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else if (height <= ce_pos)
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ce_pos = height - 1;
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for (int zz = 0; zz < channels; ++zz) {
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if (!alpha_rendering_sw && (igs::image::rgba::alp == zz)) {
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image[yy * width * channels + zz] = buf_s1.at(zz).at(yy);
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} else {
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image[yy * width * channels + zz] =
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buf_s1.at(zz).at(fl_pos) * (1.0 - div) +
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buf_s1.at(zz).at(ce_pos) * div;
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}
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}
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}
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} else {
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for (int yy = 0; yy < height; ++yy) {
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int pos = yy + static_cast<int>(floor(buf_r.at(yy) + 0.5));
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// clamp
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if (pos < 0)
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pos = 0;
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else if (height <= pos)
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pos = height - 1;
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for (int zz = 0; zz < channels; ++zz) {
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if (!alpha_rendering_sw && (igs::image::rgba::alp == zz)) {
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image[yy * width * channels + zz] = buf_s1.at(zz).at(yy);
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} else {
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image[yy * width * channels + zz] = buf_s1.at(zz).at(pos);
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}
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}
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}
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}
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}
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}
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} // namespace
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//--------------------------------------------------------------------
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void igs::warp::vert_change(float* image, const int height, const int width,
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const int channels,
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const float* refer, // by height,width,channels
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const int refchannels, const int refcc,
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const double maxlen, const bool alpha_rendering_sw,
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const bool anti_aliasing_sw) {
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vert_change_(image, height, width, channels, refer, refchannels, refcc,
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maxlen, alpha_rendering_sw, anti_aliasing_sw);
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}
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