Jungfraujoch/tests/JPEGTest.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//JFJochJPEG.h"
#include "../preview//PreviewImage.h"
#include "../writer/HDF5Objects.h"
#include "../common/RawToConvertedGeometry.h"

TEST_CASE("JPEGTest","[JPEG]") {
    size_t width = 1024;
    size_t height = 1024;
    std::vector<rgb> val(width * height);
    for (int i = 0; i < width * height; i++) {
        size_t x = i % width;
        if (x < 512) {
            val[i].r = 234;
            val[i].g = 0;
            val[i].b = 0;
        } else {
            val[i].r = 0;
            val[i].g = 0;
            val[i].b = 255;
        }
    }

    std::string s;

    CompressedImage image(val, width, height);
    REQUIRE_NOTHROW(s = WriteJPEGToMem(image));
    std::ofstream f("x.jpeg", std::ios::binary);
    f.write(s.data(), s.size());
}

// libjpeg's own error handler calls exit(); an image it refuses must come back as an exception.
TEST_CASE("JPEGTest_ErrorThrows","[JPEG]") {
    const std::vector<rgb> val(70000);   // wider than JPEG_MAX_DIMENSION
    const CompressedImage image(val, 70000, 1);
    CHECK_THROWS_AS(WriteJPEGToMem(image), JFJochException);
}