Add pixel and bitmap color depth conversion.

1 files changed, 33 insertions, 0 deletions

diff --git a/test_bitmap.cpp b/test_bitmap.cpp
new file mode 100644
index 0000000..4f20d3f
--- /dev/null
+++ b/test_bitmap.cpp
@@ -0,0 +1,33 @@
+//
+// Created by Keuin on 2022/4/14.
+//
+
+#include <gtest/gtest.h>
+
+#include "bitmap.h"
+
+TEST(Pixel, PixelDepthConvert) {
+    const auto white8 = pixel8b::white();
+    const auto white32 = pixel<uint32_t>::white();
+    ASSERT_EQ(white8, pixel8b::from(white32));
+
+    const auto black8 = pixel8b::black();
+    const auto black32 = pixel<uint32_t>::black();
+    ASSERT_EQ(black8, pixel8b::from(black32));
+
+    const auto gray8 = pixel8b{127, 127, 127};
+    const auto gray32 = pixel<uint32_t>{
+            ((1ULL << 32U) - 1U) >> 1U,
+            ((1ULL << 32U) - 1U) >> 1U,
+            ((1ULL << 32U) - 1U) >> 1U
+    };
+    ASSERT_EQ(gray8, pixel8b::from(gray32));
+
+    const auto mix8 = pixel8b{0, 127, 255};
+    const auto mix32 = pixel<uint32_t>{
+            0,
+            ((1ULL << 32U) - 1U) >> 1U,
+            ((1ULL << 32U) - 1U)
+    };
+    ASSERT_EQ(mix8, pixel8b::from(mix32));
+}
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