Function TEST

tests/visualization/glyph_atlas_test.cpp:34–57

#include <gtest/gtest.h>

TEST(GlyphAtlas, FinalizeComputesPow2AndTables) {
    // Strip 6x4: one fake glyph 'A' of advance 6; rows 0 and 3 empty,
    // rows 1-2 filled. Scan semantics: the first empty row (y=0) sets
    // real_descent=0; a later empty row after filled rows (y=3) sets
    // real_ascent=3 -> cropped height = 3 - 0 = 3.
    std::vector<std::uint8_t> strip(6 * 4, 0);
    for (int x = 0; x < 6; ++x) {
        strip[6 * 1 + x] = 255;
        strip[6 * 2 + x] = 200;
    }
    std::array<int, 256> adv{};
    adv['A'] = 6;
    // kGlyphText drives table fill; for the test call a charset-parameterized
    // overload finalize_strip_atlas(strip, w, h, adv, "A"):
    const auto atlas = oid::finalize_strip_atlas(strip.data(), 6, 4, adv, "A");
    EXPECT_EQ(atlas.texture_width, 8.0f);  // pow2 of 6
    EXPECT_EQ(atlas.texture_height, 4.0f); // pow2 of 4
    EXPECT_EQ(atlas.pixels.size(), 8u * 4u);
    EXPECT_EQ(atlas.pixels[8 * 1 + 0], 255); // packed row content preserved
    EXPECT_EQ(atlas.advances['A'][0], 6);
    EXPECT_EQ(atlas.offsets['A'][0], 0);
    EXPECT_EQ(atlas.offsets['A'][1], 0); // real_descent baseline
    EXPECT_EQ(atlas.sizes['A'][1], 3);   // cropped height = real_ascent-descent
}

TEST(GlyphAtlas, DeterministicAcrossTwoCalls) {
    std::vector<std::uint8_t> strip(4 * 2, 7);