rasterizer_cache: Separate texture swizzling to utils

src/video_core/texture/texture_decode.h

@@ -3,7 +3,7 @@
 // Refer to the license.txt file included.
 
 #pragma once
-
+#include <span>
 #include "common/common_types.h"
 #include "common/vector_math.h"
 #include "video_core/regs_texturing.h"
@@ -55,4 +55,21 @@ Common::Vec4<u8> LookupTexture(const u8* source, unsigned int x, unsigned int y,
 Common::Vec4<u8> LookupTexelInTile(const u8* source, unsigned int x, unsigned int y,
                                    const TextureInfo& info, bool disable_alpha);
 
+/**
+ * Converts pixel data encoded in BGR format to RGBA
+ *
+ * @param source Span to the source pixel data
+ * @param dest Span to the destination pixel data
+ */
+void ConvertBGRToRGBA(std::span<const std::byte> source, std::span<std::byte> dest);
+
+
+/**
+ * Converts pixel data encoded in ABGR format to RGBA
+ *
+ * @param source Span to the source pixel data
+ * @param dest Span to the destination pixel data
+ */
+void ConvertABGRToRGBA(std::span<const std::byte> source, std::span<std::byte> dest);
+
 } // namespace Pica::Texture