reasampler/tests/test_embed_strip.cpp

// Standalone tests for reasampler::instrument::ui::embed_strip — no VST3, no REAPER, no framework.
// Same fast assert loop as the sibling pure tests: assert the embedded TCP/MCP strip's
// layout math + key-span mapping + level fill directly.
//
// Covers: layoutEmbed splitting a normal area into keymap + level band, a tiny area
// (band yields to the keymap minimum, no inversion), and a zero area (all empty);
// keySpanRect mapping the 128-key span linearly, tiling adjacent spans seamlessly,
// resolving a single-key span (the root marker), and clamping out-of-range/inverted notes;
// levelFillRect clamping 0..1 and its endpoints.

#include "../src/core/instrument/ui/embed_strip.h"

#include <cstdio>

using namespace reasampler;
using namespace reasampler::instrument::ui;

static int g_fail = 0;
#define CHECK(cond) do { if(!(cond)) { \
    std::printf("FAIL line %d: %s\n", __LINE__, #cond); ++g_fail; } } while(0)

// --- layoutEmbed --------------------------------------------------------------

static void testLayoutNormalArea() {
    // A comfortable inline strip: keymap band on top, thin level band pinned to the bottom.
    const EmbedLayout L = layoutEmbed(300, 40);
    CHECK(L.keymap.x == 0 && L.keymap.y == 0 && L.keymap.right() == 300);
    CHECK(L.levelBand.x == 0 && L.levelBand.right() == 300);
    // Level band is the fixed height at the very bottom; keymap fills the rest, contiguous.
    CHECK(L.levelBand.height == kEmbedLevelBandHeight);
    CHECK(L.levelBand.bottom() == 40);
    CHECK(L.keymap.bottom() == L.levelBand.y);
    CHECK(L.keymap.height == 40 - kEmbedLevelBandHeight);
}

static void testLayoutTinyAreaKeepsKeymap() {
    // A very short area: the level band must yield so the keymap keeps its minimum, and no
    // rect inverts.
    const EmbedLayout L = layoutEmbed(300, 8);
    CHECK(L.keymap.height >= 0);
    CHECK(L.levelBand.height >= 0);
    CHECK(L.keymap.bottom() == L.levelBand.y);
    CHECK(L.levelBand.bottom() == 8);
    // The keymap is not starved below its floor when the area allows it.
    CHECK(L.keymap.height >= kEmbedKeymapMinHeight || 8 < kEmbedKeymapMinHeight);
}

static void testLayoutZeroArea() {
    const EmbedLayout L = layoutEmbed(0, 0);
    CHECK(L.keymap.width <= 0 && L.keymap.height <= 0);
    CHECK(L.levelBand.width <= 0 && L.levelBand.height <= 0);
    // Negative dimensions clamp to a zero-area, non-inverted rect.
    const EmbedLayout N = layoutEmbed(-50, -50);
    CHECK(N.keymap.right() >= N.keymap.x && N.keymap.bottom() >= N.keymap.y);
}

// --- keySpanRect --------------------------------------------------------------

static void testKeySpanFullKeyboard() {
    // The loaded capture responds across the whole keyboard, so its span is the whole band.
    const EmbedLayout L = layoutEmbed(256, 40);
    const Rect r = keySpanRect(L, 0, 127);
    CHECK(r.x == L.keymap.x);
    CHECK(r.right() == L.keymap.right());
    CHECK(r.y == L.keymap.y && r.bottom() == L.keymap.bottom());
}

static void testAdjacentSpansTileSeamlessly() {
    // 256px band, 128 keys -> 2px/key. Spans 0..59 and 60..127 must abut with no gap or
    // overlap: the low span's right == the high span's left.
    const EmbedLayout L = layoutEmbed(256, 40);
    const Rect lo = keySpanRect(L, 0, 59);
    const Rect hi = keySpanRect(L, 60, 127);
    CHECK(lo.x == L.keymap.x);
    CHECK(hi.right() == L.keymap.right());
    CHECK(lo.right() == hi.x);           // seamless tile — the load-bearing assertion
    CHECK(lo.right() == L.keymap.x + 60 * 2);  // 60 keys * 2px
}

static void testSingleKeySpanIsTheRootMarker() {
    // low == high is the root marker: exactly one key wide, inside the band.
    const EmbedLayout L = layoutEmbed(256, 40);
    const Rect root = keySpanRect(L, 60, 60);
    CHECK(root.x == L.keymap.x + 60 * 2);
    CHECK(root.width == 2);
    CHECK(root.y == L.keymap.y && root.bottom() == L.keymap.bottom());
}

static void testKeySpanClampsBadNotes() {
    const EmbedLayout L = layoutEmbed(256, 40);
    // Out-of-range notes clamp into the band; an inverted span (low > high) collapses to a
    // zero-or-positive-width rect, never inverts.
    const Rect over = keySpanRect(L, -10, 200);
    CHECK(over.x == L.keymap.x && over.right() == L.keymap.right());
    const Rect inv = keySpanRect(L, 100, 20);
    CHECK(inv.right() >= inv.x);
}

// --- levelFillRect ------------------------------------------------------------

static void testLevelFillClamps() {
    const EmbedLayout L = layoutEmbed(200, 40);
    // Zero / negative -> empty.
    CHECK(levelFillRect(L, 0.0).width <= 0);
    CHECK(levelFillRect(L, -1.0).width <= 0);
    // Full / over-full -> the whole band width.
    CHECK(levelFillRect(L, 1.0).width == L.levelBand.width);
    CHECK(levelFillRect(L, 5.0).width == L.levelBand.width);
    // Half -> ~half the band, pinned to the band's left and vertical extent.
    const Rect half = levelFillRect(L, 0.5);
    CHECK(half.x == L.levelBand.x);
    CHECK(half.y == L.levelBand.y && half.bottom() == L.levelBand.bottom());
    CHECK(half.width == L.levelBand.width / 2);
}

int main() {
    testLayoutNormalArea();
    testLayoutTinyAreaKeepsKeymap();
    testLayoutZeroArea();
    testKeySpanFullKeyboard();
    testAdjacentSpansTileSeamlessly();
    testSingleKeySpanIsTheRootMarker();
    testKeySpanClampsBadNotes();
    testLevelFillClamps();

    if (g_fail == 0) std::printf("embed_strip: all tests passed\n");
    else std::printf("embed_strip: %d FAILED\n", g_fail);
    return g_fail == 0 ? 0 : 1;
}