LibImage: Move userspace image parsing to its own library

The image utility now uses this tool instead of parsing images on its
own.

LibImage/include/LibImage/Image.h

@@ -0,0 +1,47 @@
+#pragma once
+
+#include <BAN/StringView.h>
+#include <BAN/UniqPtr.h>
+#include <BAN/Vector.h>
+
+namespace LibImage
+{
+
+	class Image
+	{
+	public:
+		struct Color
+		{
+			uint8_t r;
+			uint8_t g;
+			uint8_t b;
+			uint8_t a;
+		};
+
+	public:
+		static BAN::ErrorOr<BAN::UniqPtr<Image>> load_from_file(BAN::StringView path);
+
+		Color get_color(uint64_t x, uint64_t y) const { return m_bitmap[y * width() + x]; }
+		const BAN::Vector<Color> bitmap() const { return m_bitmap; }
+
+		uint64_t width() const { return m_width; }
+		uint64_t height() const { return m_height; }
+
+	private:
+		Image(uint64_t width, uint64_t height, BAN::Vector<Color>&& bitmap)
+			: m_width(width)
+			, m_height(height)
+			, m_bitmap(BAN::move(bitmap))
+		{
+			ASSERT(m_bitmap.size() >= width * height);
+		}
+
+	private:
+		const uint64_t m_width;
+		const uint64_t m_height;
+		const BAN::Vector<Color> m_bitmap;
+
+		friend class BAN::UniqPtr<Image>;
+	};
+
+}

LibImage/include/LibImage/Netbpm.h

@@ -0,0 +1,10 @@
+#include <BAN/ByteSpan.h>
+
+#include <LibImage/Image.h>
+
+namespace LibImage
+{
+
+	BAN::ErrorOr<BAN::UniqPtr<Image>> load_netbpm(BAN::ConstByteSpan);
+
+}