62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
// SPDX-FileCopyrightText: 2025 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
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// SPDX-License-Identifier: GPL-3.0-only
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#include "ColorScale.h"
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#include "JFJochException.h"
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float luminance(rgb input) {
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return 0.2126f * input.r + 0.7152f * input.g + 0.0722f * input.b;
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}
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void ColorScale::Select(ColorScaleEnum val) {
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current = val;
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}
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rgb ColorScale::Apply(float input, const std::vector<rgb> &map) {
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input = std::clamp(input, 0.0f, 1.0f);
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size_t num_colors = map.size();
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if (num_colors < 2) {
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throw std::invalid_argument("Colormap must have at least two colors.");
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}
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float scaled_value = input * (num_colors - 1);
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size_t lower_idx = static_cast<size_t>(scaled_value);
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size_t upper_idx = std::min(lower_idx + 1, num_colors - 1);
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float t = scaled_value - lower_idx; // Fraction for interpolation
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rgb lower = map[lower_idx];
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rgb upper = map[upper_idx];
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return {
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.r = static_cast<uint8_t>(lower.r + t * (upper.r - lower.r)),
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.g = static_cast<uint8_t>(lower.g + t * (upper.g - lower.g)),
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.b = static_cast<uint8_t>(lower.b + t * (upper.b - lower.b))
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};
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}
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rgb ColorScale::Apply(ColorScaleSpecial input) {
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switch (input) {
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case ColorScaleSpecial::Gap:
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return gap;
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default:
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case ColorScaleSpecial::BadPixel:
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return bad;
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}
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}
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rgb ColorScale::Apply(float input) {
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switch (current) {
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case ColorScaleEnum::Viridis:
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return Apply(input, viridis_colormap);
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case ColorScaleEnum::Heat:
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return Apply(input, heat_colormap);
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case ColorScaleEnum::Indigo:
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return Apply(input, white_to_indigo_colormap);
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case ColorScaleEnum::BW:
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return Apply(input, white_to_black_colormap);
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default:
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throw JFJochException(JFJochExceptionCategory::InputParameterInvalid,
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"Color scale unknown");
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}
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}
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