From eb31b6d25af2b707f04fe71fb70341c889645101 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Mon, 27 Feb 2023 11:47:52 +0100
Subject: test: add sprite bitmap test

---
 src/anim-atlas.hpp |  3 ++-
 test/app.hpp       |  1 +
 test/bitmask.cpp   | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 test/main.cpp      |  1 +
 4 files changed, 60 insertions(+), 1 deletion(-)
 create mode 100644 test/bitmask.cpp

diff --git a/src/anim-atlas.hpp b/src/anim-atlas.hpp
index d8105813..eaddef21 100644
--- a/src/anim-atlas.hpp
+++ b/src/anim-atlas.hpp
@@ -48,6 +48,8 @@ struct anim_atlas final
 
     fm_DECLARE_DELETED_COPY_ASSIGNMENT(anim_atlas);
 
+    static BitArray make_bitmask(const ImageView2D& tex);
+
 private:
     GL::Texture2D _tex;
     String _name;
@@ -59,7 +61,6 @@ private:
 
     static decltype(_group_indices) make_group_indices(const anim_def& anim) noexcept;
     static std::uint8_t rotation_to_index(StringView name) noexcept;
-    static BitArray make_bitmask(const ImageView2D& tex);
 };
 
 } // namespace floormat
diff --git a/test/app.hpp b/test/app.hpp
index b3787826..894401c8 100644
--- a/test/app.hpp
+++ b/test/app.hpp
@@ -29,5 +29,6 @@ struct test_app final : private FM_APPLICATION
     static void test_serializer();
     static void test_entity();
     static void test_loader();
+    static void test_bitmask();
 };
 } // namespace floormat
diff --git a/test/bitmask.cpp b/test/bitmask.cpp
new file mode 100644
index 00000000..f7d12dc2
--- /dev/null
+++ b/test/bitmask.cpp
@@ -0,0 +1,56 @@
+#include "app.hpp"
+#include "compat/assert.hpp"
+#include "src/anim-atlas.hpp"
+#include <Magnum/Magnum.h>
+#include <Magnum/Math/Vector4.h>
+#include <Magnum/ImageView.h>
+#include <Magnum/Image.h>
+#include <Corrade/Containers/ArrayView.h>
+#include <Magnum/PixelFormat.h>
+#include <iterator>
+
+namespace floormat {
+
+namespace {
+
+constexpr Vector4ub
+    red(0xff, 0x00, 0x00, 0x20), green(0x00, 0x00, 0xff, 0x20), blue(0xff, 0x00, 0x00, 0x20),
+    red0(0xff, 0x00, 0x00, 0x1f), green0(0x00, 0x00, 0xff, 0x1f), blue0(0xff, 0x00, 0x00, 0x1f),
+    none0(0xff, 0xff, 0xff, 0x1f), white(0xff, 0xff, 0xff, 0xff);
+
+constexpr Vector4ub img_data[] = {
+    red,   green0, blue0, white,
+    red0,  green,  blue,  none0,
+    none0, green,  blue0, blue,
+    red0,  green0, blue,  green,
+    red,   green,  blue,  none0,
+    red,   green0, blue0, red,
+};
+
+constexpr bool result[] = {
+    // inverse row order, use tac(1)
+    true,  false, false, true,
+    true,  true,  true,  false,
+    false, false, true,  true,
+    false, true,  false, true,
+    false, true,  true,  false,
+    true,  false, false, true,
+
+};
+
+} // namespace
+
+void test_app::test_bitmask()
+{
+    constexpr auto size = std::size(img_data), width = 4_uz, height = size/4;
+    static_assert(size % 4 == 0);
+    static_assert(size == std::size(result));
+    ImageView2D img{PixelFormat::RGBA8Unorm, {width, height}, img_data};
+    auto bitmask = anim_atlas::make_bitmask(img);
+    fm_assert(img.size().product() == std::size(result));
+    for (auto i = 0_uz; i < size; i++)
+        if (bitmask[i] != result[i])
+            fm_abort("wrong value at bit %zu, should be %s", i, result[i] ? "true" : "false");
+}
+
+} // namespace floormat
diff --git a/test/main.cpp b/test/main.cpp
index c01f09f0..2187ba21 100644
--- a/test/main.cpp
+++ b/test/main.cpp
@@ -25,6 +25,7 @@ int test_app::exec()
     test_serializer();
     test_entity();
     test_loader();
+    test_bitmask();
     return 0;
 }
 
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