add sdl bmp image loader

src/image_loader.hpp

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <cstdint>
+#include <vector>
+
+struct ImageLoaderI {
+	virtual ~ImageLoaderI(void) {}
+
+	struct ImageInfo {
+		uint32_t width {0};
+		uint32_t height {0};
+	};
+	virtual ImageInfo loadInfoFromMemory(const uint8_t* data, uint64_t data_size) = 0;
+
+	struct ImageResult {
+		uint32_t width {0};
+		uint32_t height {0};
+		struct Frame {
+			int32_t ms {0};
+			std::vector<uint8_t> data;
+		};
+		std::vector<Frame> frames;
+	};
+	virtual ImageResult loadFromMemoryRGBA(const uint8_t* data, uint64_t data_size) = 0;
+};
+