Jungfraujoch/tests/TIFFTest.cpp

// SPDX-FileCopyrightText: 2024 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
// SPDX-License-Identifier: GPL-3.0-only

#include <catch2/catch_all.hpp>

#include <fstream>

#include "../preview/JFJochTIFF.h"
#include "../preview/PreviewImage.h"
#include "../writer/HDF5Objects.h"
#include "../common/RawToConvertedGeometry.h"
#include <iostream>

TEST_CASE("TIFFTest","[TIFF]") {
    std::vector<uint16_t> values(512*1024);
    CompressedImage image(values, 1024, 512);
    REQUIRE_NOTHROW(WriteTIFFToString(image));
}

TEST_CASE("TIFFTest_Write_Read","[TIFF]") {
    std::vector<uint32_t> values(512*1024), values_out;
    for (int i = 0; i < values.size(); i++) {
        values[i] = (i * 17 + 2);
    }

    CompressedImage image(values, 1024, 512);

    std::string s;
    REQUIRE_NOTHROW(s = WriteTIFFToString(image));
    uint32_t lines, cols;

    REQUIRE_NOTHROW(values_out = ReadTIFFFromString32(s, cols, lines));
    REQUIRE(lines == 512);
    REQUIRE(cols == 1024);
    REQUIRE(values.size() == values_out.size());
    REQUIRE(memcmp(values.data(), values_out.data(), cols * lines * sizeof(uint32_t)) == 0);
}

TEST_CASE("TIFFTest_File","[TIFF]") {
    std::vector<uint16_t> values(512*1024);

    for (auto &i: values)
        i = 345;

    CompressedImage image(values, 1024, 512);

    REQUIRE_NOTHROW(WriteTIFFToFile("test_image.tiff", image));
}

TEST_CASE("TIFFTest_File_signed","[TIFF]") {
    std::vector<int16_t> values(512 * 1024);

    for (int i = 0; i < values.size(); i++)
        values[i] = static_cast<int16_t>(((i % 2 == 0) ? 1 : -1) * i);

    CompressedImage image(values, 1024, 512);

    REQUIRE_NOTHROW(WriteTIFFToFile("test_image_signed.tiff", image));
}

rgb rainbowColor(float t) {
    // Ensure t is in [0,1]
    t = std::max(0.0f, std::min(1.0f, t));

    // Convert to hue (0 to 6)
    float hue = t * 6.0f;

    int phase = static_cast<int>(hue);
    float fract = hue - phase;

    uint8_t p = static_cast<uint8_t>(255 * (1.0f - fract));
    uint8_t q = static_cast<uint8_t>(255 * fract);
    uint8_t full = 255;

    switch (phase) {
        case 0: return {full, q, 0};     // Red to Yellow
        case 1: return {p, full, 0};     // Yellow to Green
        case 2: return {0, full, q};     // Green to Cyan
        case 3: return {0, p, full};     // Cyan to Blue
        case 4: return {q, 0, full};     // Blue to Magenta
        case 5: return {full, 0, p};     // Magenta to Red
        default: return {full, 0, 0};    // Fallback (red)
    }
}

TEST_CASE("TIFFTest_File_rgb","[TIFF]") {
    std::vector<rgb> values(512 * 1024);

    for (int i = 0; i < values.size(); i++) {
        float t = static_cast<float>(i % 1024) / (1024 - 1);
        values[i] = rainbowColor(t);
    }
    CompressedImage image(values, 1024, 512);

    REQUIRE_NOTHROW(WriteTIFFToFile("test_image_rgb.tiff", image));
}


TEST_CASE("TIFFTest_File_float","[TIFF]") {
    std::vector<float> values(512 * 1024);
    for (int i = 0; i < values.size(); i++)
        values[i] = i / 100.0;
    CompressedImage image(values, 1024, 512);
    REQUIRE_NOTHROW(WriteTIFFToFile("test_image_float.tiff", image));
}